International Bank of Washington reported that first-quarter profits increased 13 percent to $3.5 million (49 cents a share) from $3.1 million (43 cents).

Revenues grew to $5 million from $4.6 million for the company, which is not a bank but owns interests in businesses including insurance, manufacturing and finance.

IB reported a 75 percent increase in earnings to fits properly and casualty insurance group to $1.5 million from $845,000. Earnings of the life insurance group increased 29 percent to $549,000 from $424,000.

IB finance and leasing group reported a loss of $97,000, widened from a $67,000 loss in the same quarter a year ago; profits were down at the international and industrial group.

International group earnings fell from $994,000 to $739,000. Chairman George OImsted attributed the decline to sale of the company's interest in Kuwait Financial Center and to fewer new ship registrations under the Liberian flag. IB operates the ship registration system for Liberia.

Also off slightly were earnings of IB's industrial group, which dropped from $1.9 million to $1.8 million.

International Bank's annual share-holders meeting, which was to have been held this week, has been postponed until July. A spokesman said the delay was due in part to a dispute with the Securities and Exchange Commission over proxy materials.

C. A. C. I. Inc., an Arlington-based research company, recorded an 18 percent increase in business volume and a 44 percent gain in earnings for the nine months ended March 31.

President William W. Fain said revenues jumped to $9 million from $7.6 million, and earnings climbed to $359,000 from $249,000 for the period. On a fully diluted basis, per share earnings increased 46 percent, from 24 cents to 35 cents.

BTR Realty Inc. of Linthicum Heights reported first-quarter earnings fell from $213,000 (39 cents a share) to $37,000 (7 cents), while revenues declined from $861,000 to $746,000. Unusually high volume of land sales last year led to this year's let-down, a spokesman said.

American Health Services Inc. said its net income soared to $442,000 (50 cents a share) for the six months ended March 31, while revenues increased to $10.3 million from $9.5 million.

AHS owns, operates and manages hospitals and nursing homes. For the second quarter, earnings increased to $313,000 (37 cents a share) from $93,000 (11 cents) while revenues rose to $5.3 million from $4.9 million.