American National Insurance Co. (ANAT: chart), insurance operator, said that its first-quarter net earnings declined to $49.2 million, or $1.85 per share, compared with $56.2 million, or $2.11 per share, for the same period in 2006. Excluding net realized investment gains and losses, the company reported an after tax net gain from operations of $50.8 million, or $1.91 per share, up from $48.7 million, or $1.83, in the same quarter last year. Revenue slipped to $747.7 million from $748.8 million in the comparable period last year.

Zenith National Insurance Corp. (ZNT: chart), underwriter of workers compensation insurance policies, reported net income of $64.5 million, or $1.73 per share, for the first quarter of 2007 compared with $57.5 million, or $1.55 per share, last year. Net income included gains on investments of 23 cents per share.

Independent Bank Corp. (IBCP: chart), bank holding company, reported its first-quarter earnings fell more than 60% from the previous year due to lower interest income. Net profit for the period 2007 was $4.67 million, or 20 cents per share, down from $12.34 million, or 53 cents per share, in the same period last year.

Gentex Corp. (GNTX: chart), which makes automotive and commercial fire protection products, reported first-quarter net earnings of $29.5 million, or 21 cents a share, up from $26.4 million, or 17 cents a share, in the year-ago period. Revenue rose 13% to $157.2 million from $139 million in the same quarter last year.