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United States

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

For the fiscal year ended December 31, 2005

or

For the transition period from                      to                     

Commission file number 1-9583

MBIA INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (914) 273-4545

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes x No ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ¨ No x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (Section 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10 -K. x

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer  x                Accelerated filer  ¨                 Non-accelerated filer   ¨

Indicate by check mark whether the Registrant is shell company (as defined in Rule 12b-2 of the Act). Yes ¨ No x

The aggregate market value of the voting stock held by non-affiliates of the Registrant as of June 30, 2005 was $7,949,618,222.

As of March 1, 2006, 134,008,680 shares of Common Stock, par value $1 per share, were outstanding.

Documents incorporated by reference. Portions of the Definitive Proxy Statement of the Registrant, which will be filed on or before March 31, 2006, are incorporated by reference into Parts I and III.

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INTRODUCTORY NOTE

In the fourth quarter of 2005, MBIA Inc. (the “Company”) restated it consolidated financial statements as of and for the years ended December 31, 2004, 2003, 2002, 2001, 2000, 1999 and 1998, and the Notes related thereto, as further discussed in “Note 2: Restatement Of Consolidated Financial Statements” in the Notes to Consolidated Financial Statements of MBIA Inc. and Subsidiaries included in Part II, Item 8 and Management’s Discussion and Analysis of Financial Condition and Results of Operations included in Part II, Item 7.

In connection with potential settlements of investigations by the Securities and Exchange Commission (the “SEC”) and the New York Attorney General’s Office (“NYAG”) regarding agreements entered into by its subsidiary, MBIA Insurance Corporation, in 1998 with AXA Re Finance S.A. (“ARF”), Muenchener Rueckversicherungs-Gesellshaft (“Munich Re”) and Converium Re (previously known as Zurich Reinsurance North America) in connection with losses incurred by MBIA Insurance Corporation on insured bonds issued by Allegheny Health, Education and Research Foundation (“AHERF”), as announced on March 8, 2005, the Company restated its financial statements with respect to the agreements with Converium Re. At that time, the Company believed that the accounting for the agreements with ARF and Munich Re was appropriate under Statement of Financial Accounting Standards (“SFAS”) 113, “Accounting and Reporting for Reinsurance of Short-Duration and Long-Duration Contracts.” As announced on November 8, 2005, the Company restated its financial statements for the agreements with ARF and Munich Re, made in connection with the potential settlements, to correct and restate its accounting for these agreements because, taking into account developments in the regulatory investigations since March and further accounting analyses, these agreements did not satisfy the risk transfer requirements for reinsurance accounting under SFAS 113. As a result, the Company restated its previously issued financial statements to reflect the agreements with Munich Re and ARF under deposit accounting in accordance with Statement of Position (“SOP”) 98-7, “Deposit Accounting: Accounting for Insurance and Reinsurance Contracts That Do Not Transfer Risk” instead of under reinsurance accounting. The Company also corrected and restated its 2004 statutory financial statements because they did not satisfy the requirements for reinsurance accounting under Regulation 108 of the New York State Insurance Department (“NYSID”).

Additionally, in the third quarter of 2005, the Company completed a detailed review of its derivative instruments for which it applied shortcut method hedge accounting under SFAS 133, “Accounting for Derivative Instruments and Hedging Activities”, as amended. Shortcut method hedge accounting allows the assumption that the change in fair value of a hedged item exactly offsets the change in fair value of the related derivative. After completing its review, the Company determined that certain hedging relationships did not meet every technical aspect of shortcut method hedge accounting, although, such hedging relationships would have qualified for basic hedge accounting. Since the documentation that the Company prepared was designed to support shortcut method hedge accounting, it was not sufficient to support basic hedge accounting. As a result, the Company must account for these derivatives, from 2001 to the present, as if they were not part of hedging relationships, which requires the change in fair value of these derivatives to be reflected in the Company’s income statement without an offsetting change in fair value of the hedged items. The Company restated its financial statements to correct the accounting for these derivatives for the year ended December 31, 2001 and subsequent periods through June 30, 2005. As of October 1, 2005, all of the subject hedging relationships met the requirements for basic hedge accounting and have been recorded as such in the Company’s financial statements for the year ended December 31, 2005.

The restatements were included in the Company’s Amendment No. 1 to Form 10-K filed on Form 10-K/A with the SEC on November 14, 2005 (the “Amended Annual Report”). For a further discussion of the restatements of the Company’s financial statements, see the Amended Annual Report as well as “Management’s Discussion and Analysis of Financial Condition and Results of Operation – Restatement of Consolidated Financial Statements” in Part II, Item 7 and “Note 2: Restatement Of Consolidated Financial Statements” in the Notes to Consolidated Financial Statements of MBIA Inc. and Subsidiaries in Part II, Item 8.

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PART I

MBIA Inc. (“MBIA” or the “Company”) was incorporated as a business corporation under the laws of the state of Connecticut in 1986. The Company is engaged in providing financial guarantee insurance, investment management services and municipal and other services to public finance and structured finance clients on a global basis. Financial guarantee insurance provides an unconditional and irrevocable guarantee of the payment of the principal of, and interest or other amounts owing on, insured obligations when due. The Company conducts its financial guarantee business through its wholly owned subsidiary MBIA Insurance Corporation (“MBIA Corp.”) and provides investment management products and financial services through its wholly owned subsidiary MBIA Asset Management, LLC (“MBIA Asset Management”).

MBIA Corp. is the successor to the business of the Municipal Bond Insurance Association (the “Association”) which began writing financial guarantees for municipal bonds in 1974. MBIA Corp. is the parent of MBIA Insurance Corp. of Illinois (“MBIA Illinois”) and Capital Markets Assurance Corporation (“CapMAC”), both financial guarantee companies that were acquired by MBIA Corp. MBIA Corp. also owns MBIA Assurance S.A. (“MBIA Assurance”), a French insurance company, and MBIA UK Insurance Limited (“MBIA UK”), a financial guarantee insurance company licensed in the United Kingdom. MBIA UK and MBIA Assurance write financial guarantee insurance in the member countries of the European Union. Generally, throughout the text, references to MBIA Corp. include the activities of its subsidiaries, MBIA UK, MBIA Assurance, MBIA Illinois and CapMAC.

MBIA Corp. primarily insures financial obligations which are sold in the new issue and secondary markets. It also provides financial guarantees for debt service reserve funds. As a result of the Triple-A ratings assigned to insured obligations, the principal economic value of financial guarantee insurance is the lower interest cost of an insured obligation relative to the same obligation on an uninsured basis. In addition, for complex financings and for obligations of issuers that are not well-known by investors, insured obligations receive greater market acceptance than uninsured obligations.

MBIA Corp. issues financial guarantees for municipal bonds, asset-backed and mortgage-backed securities, investor-owned utility bonds, bonds backed by publicly or privately funded public purpose projects, bonds issued by sovereign and sub-sovereign entities and obligations collateralized by diverse pools of corporate loans and credit default swaps, and also pools of corporate and asset-backed bonds, both in the new issue and secondary markets. The municipal obligations that MBIA Corp. insures include tax-exempt and taxable indebtedness of states, counties, cities, utility districts and other political subdivisions, as well as airports, higher education and health care facilities and similar authorities and obligations issued by private entities that finance projects that serve a substantial public purpose. The asset-backed and structured finance obligations insured by MBIA Corp. typically consist of securities that are payable from or which are tied to the performance of a specified pool of assets that in most cases have a defined cash flow, such as residential and commercial mortgages, proceeds of insurance policies, a variety of consumer loans, corporate loans and bonds, trade and export receivables, equipment, aircraft and real property leases, and infrastructure projects.

MBIA Corp. also insures privately issued bonds used for the financing of public purpose projects which are primarily located overseas and include toll roads, bridges, airports, public transportation facilities and other types of infrastructure projects that serve a substantial public purpose. While in the United States projects of this nature are financed through the issuance of tax-exempt bonds by special purpose, government sponsored tax-exempt entities, the general absence of tax-advantaged financing, among other reasons, has led to the transfer of the operation of many such public purpose projects to the private sector. Generally, the private entities operate under a concession agreement with the sponsoring government agency, which maintains a level of regulatory oversight and control over the project.

MBIA Corp. has Triple-A financial strength ratings from Standard and Poor’s Corporation (“S&P”), which the Association received in 1974; from Moody’s Investors Service, Inc. (“Moody’s”), which the Association received in 1984; from Fitch, Inc. (“Fitch”), which MBIA Corp. received in 1995; and from Rating and Investment Information, Inc. (“RII”), which MBIA Corp. received in 1998. Both MBIA Assurance and MBIA UK have Triple-A financial strength ratings from S&P, Moody’s and Fitch. Obligations which are guaranteed by MBIA Corp., MBIA Assurance and MBIA UK are rated Triple-A primarily based on these financial strength ratings. Both S&P and Moody’s have also continued the Triple-A rating on MBIA Illinois and CapMAC guaranteed bond issues. The Triple-A ratings are important to the operation of the Company’s business and any reduction in these ratings could have a material adverse effect on MBIA Corp.’s ability to compete and could also have a material adverse effect on the business, operations and financial results of the Company.

MBIA Asset Management offers cash management, customized asset management and investment consulting services to local governments, school districts and other institutional clients. It offers fixed-income asset management services for the investment portfolios of the Company, MBIA Corp. and other affiliates and also for third-party clients. MBIA Asset Management raises funds for investment management through the issuance of investment agreements, which are issued by the Company and guaranteed by MBIA Corp., to states and municipalities and as part of asset-backed or structured securities for the investment of bond proceeds and other

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funds. It also raises funds through the issuance of medium-term notes (“MTNs”) which are issued by its affiliate MBIA Global Funding, LLC (“GFL”) and guaranteed by MBIA Corp. MBIA Asset Management invests the proceeds of the investment agreements and MTNs in high quality eligible investments both in the United States and abroad. MBIA Asset Management offers these services and products through MBIA Municipal Investors Service Corporation (“MBIA-MISC”), MBIA Investment Management Corp. (“IMC”), MBIA Capital Management Corp. (“CMC”), GFL, Euro Asset Acquisition Limited (“EAAL”) and MBIA Asset Management UK Limited (“AM-UK”).

MBIA Asset Management also administers three multi-seller conduit financing vehicles, Triple-A One Funding Corp., Meridian Funding Company, LLC and Polaris Funding Company, LLC (together, the “Conduits”) through MBIA Asset Finance, LLC. The Conduits provide funding for multiple customers through special purpose vehicles that issue primarily commercial paper and MTNs.

MBIA MuniServices Company (“MuniServices”) provides revenue enhancement services and products, such as discovery, audit, collections/recovery and information (data) services, to state and local governments. Through MuniServices the Company also owns Capital Asset Holdings GP, Inc. and certain affiliated entities (collectively, “Capital Asset”). Capital Asset was in the business of acquiring and servicing tax liens. The Company has subsequently exited the tax lien business and Capital Asset’s primary activity is servicing a tax lien securitization insured by MBIA Corp.

Statements included in this Form 10-K which are not historical or current facts are “forward-looking statements” made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. The words “believe,” “anticipate,” “project,” “plan,” “expect,” “intend,” “will likely result,” or “will continue,” and similar expressions identify forward-looking statements. These statements are subject to certain risks and uncertainties that could cause actual results to differ materially from historical earnings and those presently anticipated or projected. We wish to caution readers not to place undue reliance on any such forward-looking statements, which speak only as of their respective dates. The following are some of the factors that could cause actual results to differ materially from estimates contained in or underlying the Company’s forward-looking statements: (1) fluctuations in the economic, credit, interest rate or foreign currency environment in the United States or abroad; (2) level of activity within the national and international credit markets; (3) competitive conditions and pricing levels; (4) legislative or regulatory developments; (5) technological developments; (6) changes in tax laws; (7) the effects of mergers, acquisitions and divestitures; and (8) uncertainties that have not been identified at this time. The Company undertakes no obligation to publicly correct or update any forward-looking statement if it later becomes aware that such result is not likely to be achieved.

MBIA Corp. Insured Portfolio

At December 31, 2005, the net par amount outstanding on MBIA Corp.’s insured obligations (including insured obligations of MBIA Illinois, MBIA Assurance, MBIA UK and CapMAC, but excluding $15.6 billion of MBIA insured investment agreements and MTNs for MBIA Asset Management) was $585 billion. Net insurance in force, which includes all insured debt service, at December 31, 2005 was $889 billion. Net insurance in force, which is net of cessions to reinsurers, is also net of other reimbursement agreements that relate to certain contracts under which MBIA Corp. is entitled to reimbursement of losses on its insured portfolio but which do not qualify as reinsurance under accounting principles generally accepted in the United States of America (“GAAP”).

Because MBIA Corp. generally guarantees to the holder of the underlying obligation the timely payment of amounts due on such obligation in accordance with its original payment schedule, in the case of a default on an insured obligation, payments under the insurance policy cannot be accelerated against MBIA Corp., except in certain limited circumstances, unless MBIA Corp. consents to the acceleration. Otherwise, MBIA Corp. is required to pay principal, interest or other amounts only as originally scheduled payments come due. However, MBIA Corp. may from time to time insure obligations under credit default swaps which by their terms require that termination payments be paid at the time of the default of the underlying reference obligation(s). Termination payments are generally calculated by deducting the market value of the reference obligation on the termination date from the specified amount of the reference obligation. The Company estimates that the liquidity needs arising from future termination payments are modest due to MBIA Corp.’s strategy of insuring such obligations with high levels of subordination and credit enhancement.

MBIA Corp. seeks to maintain a diversified insured portfolio and has designed the insured portfolio to manage and diversify risk based on a variety of criteria including revenue source, issue size, type of asset, industry concentrations, type of bond and geographic area. As of December 31, 2005, MBIA Corp. had 27,081 policies outstanding (excluding 1,026 policies relating to MBIA Asset Management transactions guaranteed by MBIA Corp.). These policies are diversified among 10,717 “credits,” which MBIA Corp. defines as any group of issues supported by the same revenue source.

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The table below sets forth information with respect to the original par amount insured per issue in MBIA Corp.’s portfolio as of December 31, 2005:

MBIA Corp. Original Par Amount Per Issue as of December 31, 2005 (1) (2)

MBIA Corp. underwrites its policies on the assumption that the insurance will remain in force until maturity of the insured obligations. MBIA Corp. estimates that the average life (as opposed to the stated maturity) of its insurance policies in force at December 31, 2005 was 10.4 years. The average life was determined by applying a weighted-average calculation, using the remaining years to maturity of each insured obligation and weighting them on the basis of the remaining debt service insured. No assumptions were made for any future refundings of insured issues. Average annual insured debt service on the portfolio at December 31, 2005 was $69.5 billion.

MBIA Corp. writes financial guarantees for municipal issuers in the United States. Municipal bonds consist of both taxable and tax-exempt bonds and notes that are issued by states, cities, political subdivisions, utility districts, airports, health care institutions, higher educational facilities, housing authorities and other similar agencies, as well as private entities that issue obligations to fund projects that serve a substantial public purpose. These types of obligations are supported by taxes, assessments, fees or tariffs related to use of projects, lease payments or other similar types of revenue streams. MBIA Corp. also guarantees structured finance and asset-backed obligations. In general, structured finance obligations are secured by or payable from a specific pool of assets having an ascertainable future cash flow. MBIA Corp. also insures payments due under credit and other derivatives, including termination payments that may become due upon the occurrence of certain events.

MBIA Corp. also insures privately issued bonds used for the financing of public purpose projects, which are primarily located overseas and that include toll roads, bridges, airports, public transportation facilities and other types of infrastructure projects serving a substantial public purpose. While in the United States, projects of this nature are primarily financed through the issuance of tax-exempt bonds by special purpose, government sponsored tax-exempt entities, the general absence of tax-advantaged financing, among other reasons, has led to the transfer of the operation of many such public purpose projects to the private sector. Generally, the private entities operate under a concession agreement with the sponsoring government agency, which maintains a level of regulatory oversight and control over the project.

Structured finance obligations are either undivided interests in the related assets, or debt obligations collateralized by the related assets. Structured finance transactions are often structured such that the insured obligations benefit from some form of credit enhancement to cover credit risks such as over-collateralization, subordination, excess cash flow or first loss protection. Structured finance obligations contain certain risks including asset risk, which relates to the amount and quality of asset coverage, structural risk, which relates to the extent to which the transaction structure protects the interests of the investors from the bankruptcy of the originator of the underlying assets or the issuer of the securities, and servicer risk, which relates to problems with the transaction servicer (the entity which is responsible for collecting the cash flow from the asset pool) that could affect the servicing of the underlying assets. In general, the asset risk is addressed by sizing the asset pool and its associated protection level based on the historical and expected future performance of the assets. Structural risks primarily involve bankruptcy risks, such as whether the sale of the assets by the originator to the issuer would be upheld in the event of the bankruptcy or insolvency of the originator and whether the servicer of the assets may be required to delay the remittance of any cash collections held by it or received by it after the time it becomes subject to bankruptcy or insolvency proceedings. Structured finance transactions are usually structured to insulate the investors from the bankruptcy or insolvency of the entity that originated the underlying assets, as well as from the bankruptcy or insolvency of the servicer, and to minimize the likelihood of the bankruptcy or insolvency of the issuer of the obligation. The ability

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of the servicer to properly service and collect on the underlying assets is also a factor in determining future asset performance. MBIA Corp. addresses these issues through its servicer due diligence and underwriting guidelines, its formal credit review and approval process and its post-closing servicing review and monitoring.

Outside of the United States, sovereign and sub-sovereign issuers, structured finance issuers, utilities and other issuers, including private issuers who are financing projects with a substantial public purpose, are increasingly using financial guarantee insurance to guarantee their public finance and structured finance obligations. Ongoing privatization efforts have shifted the burden of financing new projects from the government to the capital markets, where investors can benefit from the security of financial guarantee insurance. There is also growing interest in asset-backed securitization. While the principles of securitization have been increasingly applied in overseas markets, the rate of development in particular countries has varied due to the sophistication of the local capital markets and the impact of financial regulatory requirements, accounting standards and legal systems. It is expected that securitization will continue to expand internationally, at varying rates in each country. MBIA Corp. insures both structured finance and public finance obligations in selected international markets. MBIA Corp. believes that the risk profile of the international business it insures is generally the same as in the United States, but recognizes that there are particular risks related to each country and region. These risks include the legal, economic and political situation, the varying levels of sophistication of the local capital markets and currency exchange risks. MBIA Corp. evaluates and monitors these risks carefully.

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The following table shows the diversification of MBIA Corp.’s insured portfolio by bond type:

MBIA Corp. Insured Portfolio by Bond Type

as of December 31, 2005 (1) (2)

(In billions)

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As of December 31, 2005, of the $585 billion outstanding net par amount of obligations insured, $403.3 billion, or 68.9%, were insured in the global public finance market and $181.7 billion, or 31.1%, were insured in the global structured finance market.

The table below shows the diversification by type of insurance written by MBIA Corp. in each of the last five years:

MBIA Corp. Net Par Amount Written by Bond Type (1)

(In millions)

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MBIA Corp. is licensed to write business in all 50 states, the District of Columbia, Guam, the Northern Mariana Islands, the U.S. Virgin Islands, Puerto Rico, the Kingdom of Spain and the Republic of France. MBIA Assurance is licensed to write business in France and in certain member countries of the European Economic Area. MBIA UK is licensed to write business in the United Kingdom and in member countries of the European Economic Area. The following table sets forth the geographic distribution of MBIA Corp.’s net par outstanding, including the ten largest states in the United States:

MBIA Corp. Insured Portfolio Outstanding by Geographic Location

As of December 31, 2005 (1) (2)

MBIA Corp. underwriting guidelines limit the net insurance in force for any one insured credit. In addition, MBIA Corp. is subject to both rating agency and regulatory single-risk limits with respect to any insured bond issue. As of December 31, 2005, MBIA Corp.’s net par amount outstanding for its ten largest insured public finance credits totaled $23.5 billion, representing 4.0% of MBIA Corp.’s total net par amount outstanding, and the net par outstanding for its ten largest structured finance credits (without aggregating common issuers), was $20.5 billion, representing 3.5% of the total.

MBIA Corp. Insurance Programs

MBIA Corp. offers financial guarantee insurance in both the new issue and secondary markets on a global basis. At present, no new financial guarantee insurance is being offered by MBIA Illinois or CapMAC, but it is possible that either of those entities may insure transactions in the future. MBIA Corp., MBIA UK and MBIA Assurance offer financial guarantee insurance in Europe, Asia, Latin America and other areas outside the United States.

Transactions in the new issue market are sold either through negotiated offerings or competitive bidding. In negotiated transactions, either the issuer or the underwriter purchases the insurance policy directly from MBIA Corp. For municipal bond issues involving competitive bidding, the insurance is offered as an option to the underwriters bidding on the transaction. The successful bidder would then have the option to purchase the insurance.

In the secondary market, MBIA provides credit enhancement through two programs. The “RAPSS” program (Rapid Asset Protection for Secondary Securities) guarantees the payment of principal and interest on an individual security or class

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of securities traded in the secondary market in response to requests from bond traders and investors. Securities insured in the RAPSS program have the benefit of MBIA Corp.’s guarantee until maturity. The “Portfolio Insurance” program enables an investor to insure a specific portfolio of bonds and is offered as an ongoing program with investment banks, financial service companies and conduit sponsors. For each insured portfolio, MBIA Corp. establishes specific underwriting criteria for the inclusion of new assets in the program portfolio. The Portfolio Insurance program is a “while-in-trust” program which provides the benefits of an MBIA Corp. guarantee to securities only during the time they are held in a particular insured portfolio, although in some cases, MBIA Corp. may offer insurance to maturity for an additional premium.

Operations

The worldwide insurance operations of MBIA Corp. are conducted through the Global Public Finance Division, the Global Structured Finance Division, the Risk Management Division and the Insured Portfolio Management Division. Public Finance and Structured Finance operations outside of the United States are conducted in coordination with the International Division.

The Global Public Finance Division has underwriting authority with respect to certain categories of business up to pre-determined par amounts based on a risk-ranking system. In order to ensure that the guidelines are followed, Risk Management monitors and periodically reviews underwriting decisions made by the Global Public Finance Division and also participates in many transactions depending on the risk ranking. Larger, complex, or unique transactions are also then reviewed and approved at MBIA Corp.’s most senior level, the Executive Risk Committee, which consists of the Company’s Chairman, the Chief Executive Officer, the President of MBIA Corp., the Chief Risk Officer, the head of the Structured Finance new business division, the head of the Portfolio Management Group within the Risk Management Division, the head of the Insured Portfolio Management Division and the head credit officer in each of the International and Public Finance Divisions.

For all transactions done by the Global Structured Finance Division (and all Global Public Finance Transactions without decentralized underwriting approval), MBIA Corp.’s review and approval procedure has two stages. The first stage consists of screening, credit review and structuring by the appropriate business unit, in consultation with Risk Management officers. The second stage, consisting of the final review and approval of credit and structure, is performed by an underwriting committee consisting of the head of the applicable business unit, one officer from Risk Management and a third officer from either the Risk Management Division or the Insured Portfolio Management Division. Certain transactions, based on size, complexity, or other factors, are also approved by the Executive Risk Committee.

Premium rates for the Global Public, Global Structured Finance and International Divisions are established by a Pricing Committee with representation from the relevant business unit and from the Pricing Group, which provides pricing and other analysis.

Risk Management

MBIA Corp.’s risk culture and policies are set by the Executive Risk Committee, which includes the members of senior management listed above. The Executive Risk Committee periodically approves and reviews, at least annually, the Risk Management systems and processes for measuring and managing credit, market and liquidity risks. The Executive Risk Committee also appoints qualified voters at MBIA Corp.’s various committees focused on credit risk, market risk, liquidity exposure and portfolio management. The chairperson of the Executive Risk Committee is also the head of MBIA Corp.’s Risk Management Division, which is responsible for developing and implementing MBIA Corp.’s underwriting guidelines, policies and procedures to ensure an overall diversified insured portfolio with low risk characteristics.

MBIA Corp. establishes underwriting guidelines based on those aspects of credit quality that it deems important for each category of obligation considered for insurance. For public finance transactions, these aspects may include economic and social trends, debt management, financial management, adequacy of anticipated cash flow, satisfactory legal structure and other security provisions, viable tax and economic bases, adequacy of loss coverage and project feasibility, including a satisfactory consulting engineer’s report, if applicable. For structured finance transactions, MBIA Corp.’s underwriting guidelines, analysis and due diligence focus on seller/servicer credit and operational quality, the historical and projected performance of the asset pool, and the strength of the structure, including legal segregation of the assets, cash flow analysis, the size and source of first loss protection, asset performance triggers and financial covenants. For all transactions involving a non-U.S. issuer, non-U.S. assets, non-U.S. sources of cash flow or which are not denominated in U.S. dollars also include an assessment of country risk. Most transactions also undergo extensive cash flow analysis and sensitivity testing using scenario-based analysis, “Monte Carlo” probability analysis or both to examine the impact of remote events on credit performance. MBIA Corp.’s underwriting guidelines are subject to periodic review by the Executive Risk Committee, which is responsible for establishing and maintaining underwriting standards and criteria for all insurance products.

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In addition to the risk underwriting officers, the Risk Management Group has several other units. The Credit Analysis Group analyzes and monitors MBIA Corp.’s embedded exposure to financial institutions and corporate entities in the form of seller/servicer exposure or as obligors or counterparties on investment contracts, letters of credit, swaps, liquidity and other facilities supporting MBIA Corp. insured issues, and recommends terms and conditions, as well as capacity guidelines for such exposures. The Portfolio Management Group analyzes MBIA Corp.’s insured portfolio using various quantitative tools to test for diversity, credit quality, liquidity and other portfolio characteristics and recommends guidelines for risk concentrations and for internal capital requirements. Recommendations for internal capital requirements are based on a portfolio model that measures risk-adjusted capital by transaction, by sector and for the aggregate portfolio. The Portfolio Management Group also monitors all insured exposure for obligor, country, seller/servicer and other concentrations to minimize the impact of any single risk and to ensure compliance with the applicable regulatory and internal guidelines. The Transaction Analytics Group uses various quantitative tools to test and measure stress resistance on transactions and the Market Risk Group measures and assesses market risk factors in the investment management business and any exposure to market risk factors within the insurance business.

Insured Portfolio Management

The Insured Portfolio Management Division (“IPM” or the “IPM Division”) is responsible for monitoring MBIA Corp.’s outstanding insured obligations. This group’s first function is to detect any deterioration in credit quality or changes in the economic, regulatory or political environment which could adversely affect an MBIA Corp. insured issue, including interrupting the timely payment of debt service. If a problem is detected, the group works with the issuer, trustee, bond counsel, servicer, underwriter and other interested parties in an attempt to alleviate or remedy the problem in order to minimize potential defaults. The IPM Division works closely with Risk Management and the applicable business unit to analyze insured issue performance and credit risk parameters.

Once an obligation is insured, MBIA Corp. typically requires the issuer, servicer (if applicable) and the trustee to furnish periodic financial and asset related information, including audited financial statements, to the IPM Division for review. Potential problems uncovered through this review, such as poor financial results, low fund balances, covenant or trigger violations, trustee or servicer problems, or excessive litigation, could result in an immediate surveillance review and an evaluation of possible remedial actions. The IPM Division also monitors general economic and regulatory conditions, state and municipal finances and budget developments and evaluates their impact on issuers.

During the underwriting process, each insured transaction is assigned an internal credit rating. Credits are monitored according to a frequency of review schedule that is based on risk type, internal rating, performance and credit quality. Issues that experience financial difficulties, deteriorating economic conditions, excessive litigation or covenant or trigger violations are placed on the appropriate review list and are subject to surveillance reviews at intervals commensurate to the problem which has been detected. If IPM identifies concerns with respect to the performance of an insured issue it may designate such insured issue as “Caution List-Low,” “Caution List-Medium” or “Caution List-High” based on the nature and extent of these concerns and requires that an increased monitoring and, if needed, a remediation plan be implemented for the related insured issue. The Company does not establish any case basis reserves for credits that are listed as “Caution List-Low,” “Caution List-Medium” or “Caution List-High”. In the event MBIA Corp. determines that it must pay a claim or that a claim is probable and estimable with respect to an insured issue, it places the issue on its “Classified List” and establishes a case basis reserve for that insured issue. See “Losses and Reserves; Remediation” below.

There are three areas in the IPM Division. The IPM group which supports the Global Public Finance Division handles all types of domestic and international municipal issues such as general obligation, tax-backed, utility, health care, transportation and special revenue bonds, as well as investor-owned utility and project finance transactions. The IPM group which supports the Global Structured Finance Division is responsible for domestic and international structured finance transactions, including future flow transactions and collateralized debt obligations. Each group is responsible for processing waiver and consent requests and other deal modifications within their areas of responsibility. The third area, the Special Situations Group, is described below.

IPM personnel supporting the Global Public Finance Division review and report on the major credit quality factors, evaluate the impact of new developments on weaker insured credits and carry out remedial activity. In addition, this group performs analysis of financial statements and key operating data on a large-scale basis and maintains various databases for research purposes. This group is also responsible for preparing special reports which include analyses of regional economic trends, proposed tax limitations, the impact of employment trends on local economies, legal developments affecting bond security and the potential impact of events, such as natural disasters or headline events, on the insured portfolio. This unit is also responsible for all health care transactions.

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The IPM unit supporting the Global Structured Finance Division monitors insured structured finance issues, focusing on asset and servicer performance and transaction cash flows. Monitoring of insured issues typically involves review of monthly trustee, servicer and portfolio manager statements, compliance reviews with transaction documents and analysis of cash flow adequacy. Review of issuer and/or servicer performance can include site visits, forensic audits, management meetings and financial statement reviews. For problem credits, the team performs additional specialized cash flow analyses, conducts best practice reviews with servicers and facilitates loss mitigation strategies.

A separate unit within IPM (the “Special Situations Group”) assists in addressing insured exposures experiencing significant stress. The Special Situations Group is staffed with personnel with knowledge of, expertise in and experience with impaired credit situations. For issues that experience financial difficulties, deteriorating economic conditions, excessive litigation or covenant or trigger violations, the Special Situations Group works in conjunction with the related IPM personnel to assess and monitor the situation and determine the appropriate course of action, including, if necessary, developing and implementing a remediation strategy.

Investment Management Services

The Company also provides the following investment management products and financial services through its wholly owned subsidiary MBIA Asset Management.

MBIA Asset Management offers cash management, customized asset management and investment consulting services to local governments, school districts and other institutional clients through MBIA-MISC, an SEC-registered investment adviser. At December 31, 2005, $2.7 billion or 35% of the pooled investment programs managed or administered by MBIA-MISC have the benefit of commitments by the Company to cover losses incurred by these investment programs as a result of a decline in program asset values below a predetermined level. MBIA-MISC had $12.4 billion in assets under management at December 31, 2005, up 5% from $11.9 billion at December 31, 2004.

MBIA Asset Management offers fixed-income asset management services for the investment portfolios of the Company, MBIA Corp. and other affiliates and also for third-party clients through CMC, an SEC-registered investment adviser and National Association of Securities Dealers (“NASD”) member firm and through AM-UK, a Financial Services Authority registered investment advisor based in London and formed in November 2004. The market value of assets related to the Company’s insurance and corporate investment portfolios managed by CMC were $10.2 billion at December 31, 2005, down 1% from $10.3 billion at December 31, 2004. In addition, CMC and AM-UK provides investment management services for third parties. The market value of CMC and AM-UK’s third-party assets under management at December 31, 2005 was $5.5 billion, compared with $4.1 billion at December 31, 2004.

MBIA Asset Management raises funds for investment management through guaranteed investment agreements, which are issued by the Company and guaranteed by MBIA Corp., and which are offered to states and municipalities and as part of asset-backed or structured securities for the investment of bond proceeds and other funds. MBIA Asset Management also raises funds through its affiliate GFL. GFL raises funds for management through the issuance of MTNs with varying maturities (“GFL MTNs”), which are in turn guaranteed by MBIA Corp. GFL lends the proceeds of these GFL MTN issuances to the Company (“GFL Loans”). Under agreements between the Company and MBIA Corp., the Company invests the proceeds of the investment agreements and GFL Loans in eligible investments.

At December 31, 2005, principal and accrued interest outstanding on investment agreement and MTN obligations originated by MBIA Asset Management totaled $15.7 billion, compared with $12.5 billion at December 31, 2004. Assets supporting these programs had market values of $15.9 billion and $12.6 billion at December 31, 2005 and December 31, 2004, respectively. These assets are comprised of high-quality securities with an average credit quality rating of Double-A and are pledged to MBIA Corp. in support of its guarantees. MBIA Asset Management manages the programs within a number of risk and liquidity parameters monitored by the rating agencies, and maintains backup liquidity in order to ensure sufficient funds are available to make all payments due on the investment agreement and MTN obligations and to fund operating expenses. In addition, the Company has made a capital investment in these programs, which is available at any time to fund cash needs. In the event that the value of the assets is insufficient to repay the investment agreement and MTN obligations when due, the Company may incur a loss.

The Company manages its balance sheet to protect against a number of risks inherent in its business including liquidity risk, market risk (principally interest rate risk), credit risk, operational risk and legal risk. (See “Management’s Discussion and Analysis of Financial Condition and Results of Operation – Market Risk” in Part II, Item 7) The assets supporting the MBIA Asset Management programs are managed with the goal of matching the duration of the invested assets, including hedges, to the duration of the investment agreement and MTN obligations in order to minimize market and liquidity risk.

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MBIA Asset Management uses derivative financial instruments to manage interest rate risk and foreign currency risk. Credit default swaps are entered into as an extension of the group’s investment business. Forward delivery agreements are offered and periodically sold to clients. The Company has established policies limiting the amount, type and concentration of such instruments. A source of liquidity risk arises from the ability of some investment agreement counterparties to withdraw moneys on dates other than those specified in the related draw-down schedule. This liquidity risk is somewhat mitigated by provisions in certain of the investment agreements that limit an issuer’s ability to draw on the funds and by risk management procedures that require the regular re-evaluation and re-projection of draw-down schedules. Investments are restricted to fixed-income securities with a credit quality such that the overall minimum average portfolio credit quality is maintained at an average credit quality rating of Double-A. Based upon management’s projections, MBIA Asset Management maintains liquidity sources which are more than sufficient to meet its projected short-term liquidity needs.

On September 30, 2003, the Company purchased the equity and acquired all controlling interests of the conduit financing vehicles it administers, Triple-A One Funding Corp., Meridian Funding Company, LLC and Polaris Funding Company, LLC (together, the “Conduits”). The Conduits, which issue primarily commercial paper and MTNs, are now reflected in the consolidated financial statements of the Company. (See “Management’s Discussion and Analysis of Financial Condition and Results of Operation – Investment Management Services” in Part II, Item 7).

The Conduits are used by banks and other financial institutions to raise funds for their customers in the capital markets. The Conduits provide funding for multiple customers through special purpose vehicles that issue primarily commercial paper and MTNs. The proceeds from the issuance of the commercial paper or MTNs are used to either make loans to customers which are secured by certain assets or to purchase the assets from the customers. All transactions in the Conduits are insured by MBIA Corp. and are subject to MBIA Corp.’s standard underwriting process.

It is the Company’s policy to obtain an underlying rating from both Moody’s and S&P for each new transaction prior to the execution of such transactions within the Conduits. An underlying rating is the implied rating for the transaction without giving consideration to the MBIA Corp. guarantee. All transactions must be rated investment grade by both S&P and Moody’s before they can be purchased into a Conduit. The weighted-average underlying ratings for transactions currently funded in the Conduits were “A” by S&P and “A2” by Moody’s at the time such transactions were funded in the Conduits. As set forth in the table below, without giving effect to the MBIA Corp. guarantee for transactions currently funded in the Conduits, the Company estimates that the current weighted-average underlying ratings of all outstanding Conduit transactions were “A-” by S&P and “A3” by Moody’s as of December 31, 2005. The ratings in the table below are the lower underlying rating assigned by S&P or Moody’s when an underlying rating exists from either rating service, or when an external underlying rating is not available, the underlying rating is based on the Company’s best estimate of the rating of such investment.

Underlying Rating of Conduit Transactions

Without Giving Effect to the MBIA Corp. Guarantee

as of December 31, 2005

As a result of having to adhere to MBIA Corp.’s underwriting standards and criteria, Conduit transactions have, in general, the same underlying ratings that similar non-Conduit transactions guaranteed by MBIA Corp. have at the time they are closed. Like all credits underwritten by MBIA Corp., the underlying ratings on Conduit transactions may be downgraded by either one or both rating agencies after they are closed. In general, the underlying ratings on Conduit transactions have been downgraded no more frequently than similar non-Conduit transactions guaranteed by MBIA Corp.

The Conduits enter into derivative instruments primarily as economic hedges against interest rate and currency risks. It is expected that any change in the market value of the derivative instruments will be offset by a change in the market value of the hedged assets or liabilities. However, because the investments are accounted for as held-to-maturity, no change in market value, with the exception of the change in value of foreign currency assets due to changes in foreign currency rates, is recorded in the Company’s

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financial statements. Any change in the market value of derivative instruments that are not accounted for as hedges under SFAS 133 will be recorded as net gains or losses on derivative instruments and foreign exchange in the Company’s consolidated income statement.

The consolidation of the Conduits has not impacted the Company’s liquidity requirements because Triple-A One Funding Corp. has independently entered into liquidity agreements with third-party providers and because the assets and liabilities of Meridian and Polaris are structured on a match-funded basis.

At December 31, 2005, there were $4.6 billion of assets (the majority of which are investments valued at amortized cost) in the Conduits and $4.4 billion of liabilities issued through the Conduits.

Municipal Services

MBIA MuniServices Company (“MuniServices”) delivers revenue enhancement services and products to public-sector clients nationwide, consisting of discovery, audit, collections/recovery and information (data) services. The municipal services operations also includes Capital Asset Holdings GP, Inc. and certain affiliated entities (“Capital Asset”), a servicer of delinquent tax certificates.

MuniServices owns Capital Asset, which was in the business of acquiring and servicing tax liens. The Company became a majority owner of Capital Asset in December 1998. MuniServices became 100% owner of Capital Asset in December 2003. During the first two quarters of 1999, the Company attempted to sell its interest in Capital Asset. At the end of the second quarter of 1999, the Company ceased these efforts and decided to limit the activities of Capital Asset primarily to the servicing of the portfolios then being serviced by Capital Asset. In the second quarter of 1999, the Company completed an internal evaluation of Capital Asset’s tax lien portfolio, as a result of which the Company determined that it was necessary to write down its investment in Capital Asset by $102 million. In the third quarter of 1999, Capital Asset engaged a specialty servicer of residential mortgages to help manage its business and operations and to assist in administering the tax lien portfolios serviced by Capital Asset and supporting the securitizations insured by MBIA Corp.

In the third quarter of 1999, Capital Asset also completed the refinancing of substantially all of its remaining tax liens. These liens were originally financed through a commercial paper warehouse facility that matured at the end of the third quarter of 1999, which was guaranteed by the Company. The refinancing was accomplished through a securitization transaction in which the tax liens were sold to a qualifying special purpose vehicle which in turn issued notes partially secured by those liens. The proceeds of the securitization were used primarily to extinguish the warehouse facility. This was Capital Asset’s third securitization of tax liens, and MBIA Corp. has insured all of the notes issued by these securitizations. These securitizations were structured through the sale by Capital Asset of substantially all of its tax liens to off-balance sheet qualifying special purpose vehicles that were established in connection with these securitizations. The first transaction, done in 1997, had a revolving bank line of credit, guaranteed by MBIA Corp., to purchase subsequent liens against already encumbered real estate if necessary to protect previous securitized lien positions. This first transaction had an original gross par insured of $285.4 million and an available credit line of $70.0 million. The second transaction, done in 1998, also had a revolving bank line of credit, guaranteed by MBIA Corp., for the same purpose. This transaction had an original gross insured par of $175.6 million and an available credit line of $50.0 million. The final transaction, done in 1999, had an original gross par of $196.0 million. On June 30, 2004, in order to reduce ongoing carrying and other costs, a clean-up call was exercised for the Capital Asset Research Funding Series 1997A and Series 1998A tax lien securitizations. The clean-up call provisions permitted the issuer of the bonds to buy back any remaining tax liens when the principal amount of the bonds fell below ten percent of the original principal amount. In connection with the clean-up calls on June 30, 2004, MBIA Corp. paid $51.5 million (net of reinsurance) under its policies to the trustee for the securitizations, which defeased its remaining exposure to these transactions. Additionally, the payment made by MBIA Corp. related to the Capital Asset Research Funding Series 1997A and Series 1998A tax lien securitizations resulted in the Company consolidating the securitizations in its financial statements.

MBIA Corp. currently insures the third Capital Asset securitization, which is not consolidated. This transaction matures in 2008 and has an outstanding balance of $117 million, for which the Company has posted a case basis reserve of $68 million. Because the ultimate collectibility of tax liens is difficult to estimate, there can be no assurance that the case reserves established to date would be sufficient to cover all future claims under this policy. MBIA Corp. will continue to evaluate the performance of the remaining tax lien portfolio and adjust loss reserves or salvage as and when necessary. See “Losses and Reserves; Remediation” for additional information on the Company’s loss reserving process.

Competition

The financial guarantee insurance business is highly competitive. Several other monoline insurance companies compete directly against MBIA Corp. in writing financial guarantee insurance, all of which, like MBIA Corp., have Triple-A financial strength ratings from Moody’s and S&P. In addition, there are several other monoline insurance companies which compete with MBIA Corp. in writing financial guarantee insurance as a primary insurer which have lower ratings. MBIA Corp. also competes with composite (multi-line) insurers.

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Financial guarantee insurance also competes with other forms of credit enhancement, including senior-subordinated structures, credit derivatives, over-collateralization, letters of credit and guarantees (for example, mortgage guarantees where pools of mortgages secure debt service payments) provided by banks and other financial institutions, some of which are governmental agencies or have been assigned the highest credit ratings awarded by one or more of the major rating agencies. Letters of credit are most often issued for periods of less than 10 years, although there is no legal restriction on the issuance of letters of credit having longer terms. Thus, financial institutions and banks issuing letters of credit compete directly with MBIA Corp. to guarantee short-term notes and bonds with a maturity of less than 10 years. To the extent that banks providing credit enhancement may begin to issue letters of credit with commitments longer than 10 years, the competitive position of financial guarantee insurers, such as MBIA Corp., could be adversely affected. Letters of credit are also frequently used to assure the liquidity of a short-term put option for a long-term bond issue. This assurance of liquidity effectively confers on such issues, for the short term, the credit standing of the financial institution providing the facility, thereby competing with MBIA Corp. and other financial guarantee insurers in providing interest cost savings on such issues. Other highly rated institutions, including pension funds and government sponsored entities, also offer third-party credit enhancement on asset-backed and municipal obligations. Financial guarantee insurance and other forms of credit enhancement also compete in nearly all instances with the issuer’s alternative of foregoing credit enhancement and paying a higher interest rate. If the interest savings from insurance or another form of credit enhancement are not greater than the cost of such credit enhancement, the issuer will generally choose to issue bonds without third-party enhancement.

Certain characteristics of the Triple-A rated financial guarantee insurance business act as barriers-to-entry to potential new competitors. For example, there are minimum capital requirements imposed on a financial guarantee insurance company by the rating agencies to obtain and maintain Triple-A financial strength ratings and these capital requirements may deter other companies from entering this market. However, there can be no assurance that these capital requirements will deter potential competitors from entering this market or that the market may increasingly accept guarantees provided by Double-A or lower rated insurers who have less stringent capital requirements. In addition, under New York law, multi-line insurers are prohibited from writing financial guarantee insurance in New York State. See “Part I, Item 1. Business—Insurance Regulation.” However, there can be no assurance that major multi-line insurers or other financial institutions will not participate in financial guarantee insurance in the future, either directly or through monoline subsidiaries.

Reinsurance

State insurance laws and regulations, as well as the rating agencies who rate MBIA Corp., impose minimum capital requirements on financial guarantee companies, limiting the aggregate amount of insurance and the maximum size of any single risk exposure which may be written. MBIA Corp. decreases the insured exposure in its portfolio and increases its capacity to write new business by using treaty and facultative reinsurance to reduce its gross liabilities on an aggregate and single risk basis. Additionally, MBIA Corp. has entered into agreements under which it is entitled to reimbursement of losses on its insured portfolio but which do not qualify as reinsurance under GAAP.

MBIA Corp.’s net retention on the policies it writes varies from time to time depending on its own business needs and the capacity available in the reinsurance market. From its reorganization in December 1986 through December 1987, MBIA Corp. reinsured a portion of each policy through quota and surplus share reinsurance treaties. Each treaty provides reinsurance protection with respect to policies written by MBIA Corp. during the term of the treaty, for the full term of the policy. Under its quota share treaty, MBIA Corp. ceded a fixed percentage of each policy insured. Since 1988, MBIA Corp. has entered into primarily surplus share treaties under which a variable percentage of risk over a minimum size is ceded, subject to a maximum percentage specified in the related treaty. Reinsurance ceded under the treaties is for the full term of the underlying policy.

MBIA Corp. also enters into facultative reinsurance arrangements from time to time primarily in connection with issues which, because of their size, require additional capacity beyond MBIA Corp.’s retention and treaty limits. Under these facultative arrangements, portions of MBIA Corp.’s liabilities are ceded on an issue-by-issue basis. MBIA Corp. may also use facultative arrangements as a means of managing its exposure to single issuers or counterparties to comply with regulatory and rating agency requirements, as well as internal underwriting and portfolio management criteria.

As a primary insurer, MBIA Corp. is required to honor its obligations to its policyholders whether or not its reinsurers and others perform their agreement obligations to MBIA Corp. The financial position and financial strength rating of all its reinsurers are monitored by MBIA Corp. on a regular basis. The downgrade or default of one or more of the Company’s reinsurers is not expected to have a material adverse impact on the Company’s ratings, financial condition or results of operations.

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As of December 31, 2005, MBIA Corp. has retained $585 billion or 87.9% of the gross par outstanding of all transactions insured by it and its insurance company affiliates and ceded approximately $80.7 billion or 12.1% under reinsurance contracts with reinsurers and other reimbursement agreements. The amounts of exposure ceded to reinsurers at December 31, 2005 and 2004 by bond type and by geographic location are set forth in “Note 22: Reinsurance” in the Notes to Consolidated Financial Statements of MBIA Inc. and Subsidiaries.

The following table shows the reinsurers providing reinsurance to MBIA measured by outstanding par ceded to and reinsurance recoverables from reinsurers by rating levels at December 31, 2005:

While Channel Reinsurance Ltd. (“Channel Re”) continues to be rated Triple-A, S&P has revised its rating outlook on Channel Re from “stable” to “negative”. As discussed below, the Company has an equity interest in both Channel Re and the holding company parent of Ram Reinsurance Company, Ltd. (“RAM Re”).

The financial strength ratings of certain of MBIA Corp.’s reinsurers have been downgraded below Triple-A. While these reinsurers continue to remain on risk for potential losses on ceded insurance exposure, the value of the reinsurance to the Company is decreased due to the increased amounts of capital that MBIA Corp. is required to hold with respect to the ceded risks as a result of the reinsurers’ downgrade. Generally, MBIA Corp. has the right to terminate a reinsurance agreement when the reinsurer is downgraded below certain agreed-upon thresholds or if the capital credit received by MBIA Corp. for the reinsurance decreases below the agreed-upon thresholds and it may elect to take back ceded business so as to more effectively deploy its capital. However, in the event that MBIA Corp. elects to take back ceded business from a downgraded reinsurer, there can be no assurance that alternative reinsurance capacity will be available or that MBIA Corp. will be able to secure reinsurance on favorable terms. In the event that MBIA Corp. is unable to obtain reinsurance with a highly rated reinsurer, the amount of capital required to maintain MBIA Corp.’s Triple-A rating could increase.

The Company has launched several initiatives in the past several years which were aimed at increasing its financial flexibility and Triple-A reinsurance capacity and reducing risks in its insured portfolio. These initiatives include making strategic investments in monoline reinsurers, entering into risk allocation arrangements with government entities and arranging for loss protection through other financial products.

In 2003, the Company invested $25 million for an 11.4% ownership interest in the holding company parent of RAM Re, a financial guarantee reinsurer located in Bermuda rated “AAA” by S&P and “Aa3” by Moody’s. The Company’s investment, among other things, assisted RAM Re in maintaining its ratings.

In February 2004, the Company, together with RennaissanceRe Holdings, Ltd., Koch Financial Re, Ltd. and Partner Reinsurance Company Ltd., formed Channel Re, a new Bermuda-based financial guarantee reinsurance company rated Triple-A by S&P and Moody’s. The Company invested $63.7 million for a 17.4% ownership interest in Channel Re.

In February 2004, MBIA Corp. and Channel Re entered into arrangements whereby Channel Re agreed to provide committed reinsurance capacity to MBIA Corp. at least through June 30, 2008. Under treaty and facultative reinsurance arrangements MBIA Corp. agreed to cede to Channel Re and Channel Re agreed to assume from MBIA Corp. varying percentages of designated policies issued by MBIA Corp. The amount of any policy subject to the committed reinsurance arrangements is based on the type of risk insured and on other factors. The reinsurance arrangements provide Channel Re with certain preferential terms, including those related to ceding commissions. The treaty reinsurance arrangement was renewed in 2005.

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In September 2004, MBIA Corp. entered into an investment guaranty arrangement with a development agency of the United States government which helps domestic private sector businesses manage risks associated with direct foreign investment. In December 2005, MBIA Corp. entered into a facultative reinsurance arrangement with a development agency of a foreign government which promotes exports and assists domestic manufacturing. Under these arrangements, the agencies undertake to indemnify MBIA Corp. for their respective proportionate share of loss on ceded exposures.

MBIA Corp. may also look to reduce risks embedded in its insured portfolio by entering into derivative transactions or other types of hedging arrangements. In December 2004, MBIA Corp. executed a $550.8 million capital markets transaction in which it hedged a portion, or $275.8 million at closing, of the credit and market risk associated with its synthetic CDO portfolio. In 2004, MBIA Corp. received approval from the NYS Insurance Department for a derivative use plan which authorizes MBIA Corp. to hedge certain risks through the use of derivative instruments and may look to enter into hedging transactions to reduce risks on an individual and portfolio-wide basis.

In 1998, three reinsurers, Converium Reinsurance (North America) Inc. (“Converium”), AXA Re Finance S.A. (“ARF”) and Muenchener Rueckversicherungs-Gesellshaft (“Munich Re”) paid MBIA Corp. $170 million under three separate agreements (each, an “Excess-of-Loss Agreement” and, collectively, the “Excess-of-Loss Agreements”) in connection with losses MBIA Corp. incurred on $265 million of MBIA-insured bonds issued by the Pittsburgh-based Alleghany Health, Education and Research Foundation (“AHERF”). The Excess-of-Loss Agreements were structured as three successive excess-of-loss facilities that aggregated to $170 million. Under the Excess-of-Loss Agreements, Converium paid MBIA Corp. $70 million and Munich Re and ARF each paid MBIA Corp. $50 million.

In connection with the arrangements for the Excess-of-Loss Agreements, MBIA Corp. entered into quota share agreements with Munich Re, ARF and Converium (each a “Quota Share Agreement” and, collectively, the “Quota Share Agreements”). Under the Quota Share Agreements, MBIA Corp. agreed to cede to the three reinsurers new business written with an aggregate par sufficient to generate $297 million in gross premiums over a six year period ending October 1, 2004. Of the $297 million in premiums to be ceded under the Quota Share Agreements, MBIA Corp. agreed to cede to Converium cash premiums equal to $102 million, to ARF adjusted gross premiums of $97 million and to Munich Re adjusted gross premiums of $98 million over this period.

Under separate agreements, to which MBIA Corp. was not a party, Converium reinsured directly and indirectly to ARF (the “Converium-ARF Retrocession Agreements”) the risk that it had assumed from MBIA Corp. under its Quota Share Agreements with MBIA Corp. for losses in excess of $13.1 million. ARF contended that, in connection with its agreement to assume this risk from Converium under the Converium-ARF Retrocession Agreements, there was an oral agreement with MBIA Corp. under which MBIA Corp. would replace ARF as a reinsurer to Converium by no later than October 2005.

In October 2004, MBIA Corp. commuted and assumed from ARF the policies that ARF had assumed directly under its Quota Share Agreements with MBIA Corp. discussed above (the “MBIA-ARF Agreements”). At the same time, MBIA Corp. also assumed from ARF all of the risk that ARF assumed from Converium under the Converium-ARF Retrocession Agreements. AXA RE, S.A (“AXA RE”), ARF’s parent, in turn agreed to reinsure MBIA Corp. for all losses in excess of $96.9 million assumed by MBIA Corp. from ARF under the Converium-ARF Retrocession Agreements up to an aggregate amount of $90 million. ARF paid MBIA Corp. $10 million for assuming from it the risk under the Converium-ARF Retrocession Agreements, and MBIA Corp. paid AXA RE $1 million for reinsuring MBIA Corp. for all losses in excess of $96.9 million assumed by MBIA Corp. from ARF under the Converium-ARF Retrocession Agreements up to an aggregate amount of $90 million.

In addition to the $10 million that MBIA Corp. received as described above, MBIA Corp. received approximately $19.5 million related to the commutation of the MBIA-ARF Agreement, consisting of statutory unearned premium reserves of $42.5 million less refunded ceding commissions of $13.9 million and fees of $9.1 million. In addition, MBIA Corp. will receive future installment premiums with a present value of approximately $21.5 million in connection with the commuted policies. As a result of this transaction, MBIA Corp. reassumed $21.3 billion in aggregate insured par. The commutation of the MBIA-ARF Agreement and the assumption by MBIA Corp. from ARF of the risk under the Converium-ARF Retrocession Agreements were done in order, among other reasons, to settle and resolve the disputes with ARF regarding the alleged oral agreement. In addition, MBIA Corp. entered into these agreements and agreed to assume the related policies due to the fact that it no longer received rating agency capital credit in connection with the exposures ceded to ARF and Converium because ARF no longer has a financial strength rating and the financial strength rating of Converium had been downgraded.

In October 2004, the Company’s management recommended that the Audit Committee of the Company’s Board of Directors undertake an investigation of the Excess-of-Loss Agreements and the Quota Share Agreements, including whether an oral agreement existed between MBIA Corp. and ARF that MBIA Corp. would assume the risk that Converium retroceded to ARF under the Converium-ARF Retrocession Agreements. The Audit Committee retained outside counsel and initiated an investigation in October 2004. On March 8, 2005, the Company announced that it was restating its financial statements for 1998 and subsequent years to correct the accounting for the transactions with Converium based on, among other considerations, a determination by the outside

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counsel investigation that it appeared likely that an oral agreement or understanding with ARF was made in 1998. The Company reflected this correction in the consolidated financial statements of its original Annual Report on Form 10-K for the year ended December 31, 2004. At that time, the Company believed that the accounting for the Excess-of-Loss Agreements and Quota Share Agreements with Munich Re and ARF was appropriate under SFAS 113.

On November 8, 2005, the Company announced its decision to correct and restate its previously issued financial statements for 1998 and subsequent years in connection with potential settlements of investigations by the SEC and the NYAG regarding the Excess-of-Loss Agreements and the Quota Share Agreements entered into with Munich Re and ARF. For a further discussion of the restatement of the Company’s Financial Statements refer to “Management’s Discussion and Analysis of Financial Condition and Results of Operation” in Part II, Item 7 and “Note 2: Restatement Of Consolidated Financial Statements” in the Notes to Consolidated Financial Statements of MBIA Inc. and Subsidiaries in Part II, Item 8.

MBIA Corp. has entered into a reinsurance agreement with MBIA UK providing for MBIA Corp.’s reimbursement of the losses incurred by MBIA UK in excess of a specified threshold and a net worth maintenance agreement in which MBIA Corp. agrees to maintain the net worth of MBIA UK, to remain its sole shareholder and not to pledge its shares. Under the reinsurance agreement, MBIA Corp. has agreed to reimburse MBIA UK on an excess-of-loss basis for losses incurred in each calendar year for net retained insurance liability, subject to certain contract limitations. Under the net worth maintenance agreement, MBIA Corp. agrees to maintain a minimum capital and surplus position at MBIA UK in accordance with United Kingdom and New York State legal requirements.

MBIA Corp. and MBIA Assurance have also entered into a reinsurance agreement providing for MBIA Corp.’s reimbursement of the losses incurred by MBIA Assurance in excess of a specified threshold and a net worth maintenance agreement in which MBIA Corp. agrees to maintain the net worth of MBIA Assurance, to remain its sole shareholder and not to pledge its shares. Under the reinsurance agreement, MBIA Corp. has agreed to reimburse MBIA Assurance on an excess-of-loss basis for losses incurred in each calendar year for net retained insurance liability, subject to certain contract limitations. Under the net worth maintenance agreement, MBIA Corp. agrees to maintain a minimum capital and surplus position in accordance with French and New York State legal requirements.

MBIA Corp. and MBIA Illinois have entered into a reinsurance agreement under which MBIA Corp. reinsured 100% of all business written by MBIA Illinois, net of cessions by MBIA Illinois to third-party reinsurers, in exchange for MBIA Illinois’ transfer of the assets underlying the related unearned premium and contingency reserves. Pursuant to such reinsurance agreement, MBIA Corp. reinsured all of the net exposure of $30.9 billion, or approximately 68% of the gross debt service outstanding, of the municipal bond insurance portfolio of MBIA Illinois, the remaining 32% having been previously ceded to treaty and facultative reinsurers of MBIA Illinois. In 1990, 10% of this portfolio was ceded back to MBIA Illinois to comply with regulatory requirements. Effective January 1, 1999, MBIA Corp. and MBIA Illinois entered into a replacement reinsurance agreement whereby MBIA Corp. agreed to accept as reinsurance from MBIA Illinois 100% of the net liabilities and other obligations of MBIA Illinois, for losses paid on or after that date, thereby eliminating the 10% retrocession arrangement previously in place.

MBIA Corp. and CapMAC have entered into a reinsurance agreement, effective April 1, 1998, under which MBIA Corp. has agreed to reinsure 100% of the net liability and other obligations of CapMAC in exchange for CapMAC’s payment of a premium equal to the ceded reserves and contingency reserves. Pursuant to such reinsurance agreement with CapMAC, MBIA Corp. reinsured all of CapMAC’s then-current net exposure of $31.6 billion, or approximately 78% of CapMAC’s gross debt service then outstanding, the remaining 22% having been previously ceded to treaty and facultative reinsurers of CapMAC.

Investments and Investment Policy

The Finance Committee of the Board of Directors of the Company approves the Company’s general investment objectives and policies, and also reviews more specific investment guidelines. CMC manages all of MBIA Corp.’s consolidated investment portfolios and substantially all of the Company’s investment portfolios. Investment objectives, policies and guidelines related to CMC’s investment activity on behalf of MBIA Corp. and its insurance company affiliates are also subject to review and approval by the respective Investment Committees of the Boards of Directors of MBIA Corp. and each of its insurance company affiliates.

To continue to provide strong capital resources and claims-paying capabilities for its insurance operations, the investment objectives and policies for insurance operations set quality and preservation of capital as the primary objective, subject to an appropriate degree of liquidity. Maximization of after-tax investment income and investment returns is an important but secondary objective. The insurance operations assets are managed by CMC subject to an agreement between CMC and MBIA Corp. and its subsidiaries.

Investment objectives, policies and guidelines related to MBIA Asset Management’s investment agreement and other businesses are also subject to review and approval by the Finance Committee of the Board of Directors and the Executive Market Risk

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Committee, which includes various members of senior management. The primary investment objectives of MBIA Asset Management in these businesses are to preserve capital, to achieve an investment duration that closely approximates the expected duration of related liabilities, and to maintain appropriate liquidity.

The Company’s consolidated investment portfolio as shown on its balance sheet at December 31, 2005 was $32.2 billion, of which $5.8 billion represented held-to-maturity investments at amortized cost. The information and tables contained below relate to the Company’s consolidated investment portfolio (the “Investment Portfolio”).

For the year ending December 31, 2005, approximately 66% of the Company’s net income was derived from after-tax earnings on its investment portfolio. The following table sets forth investment income and related data for the years ending December 31, 2003, 2004 and 2005:

Investment Income of the Company

(In thousands)

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The tables below set forth the composition of the Company’s investment portfolios. The references to “Insurance” in the tables below refer to the investment portfolio assets held by the Company’s insurance operations, the references to “Investment Management Services” refers to investment portfolio assets held by the Company’s investment management services operations and the references to “Investments Held-to-maturity” refer to assets held in the Conduits and certain variable interest entities. The weighted-average yields in the tables reflect the nominal yield on market value as of December 31, 2005, 2004 and 2003.

Investment Portfolio by Security Type

as of December 31, 2005

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Investment Portfolio by Security Type

as of December 31, 2004

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Investment Portfolio by Security Type

as of December 31, 2003

The duration of the insurance fixed-income portfolio was 5.3 years as of December 31, 2005 and December 31, 2004. The average maturity of the insurance fixed-income portfolio, excluding short-term investments, as of December 31, 2005 and December 31, 2004 was 7.96 years and 8.46 years, respectively.

The table below sets forth the distribution by contractual maturity of the Company’s consolidated fixed-income investments. Contractual maturity may differ from expected maturity because the borrowers may have the right to call or prepay obligations.

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Fixed-Income Investments by Maturity

as of December 31, 2005

The credit quality distribution of the Company’s fixed-income investments, which is based on ratings from Moody’s (or from alternate rating sources, such as S&P, for a small percentage of securities that are not rated by Moody’s), is presented in the following table:

Fixed-Income Investments by Credit Quality Rating

as of December 31, 2005 (1)