Primark Corp., a McLean-based holding company primarily engaged in health care information and financial and ground transportation services, yesterday reported a second-quarter loss of $336,000, compared with a profit of $1.2 million (6 cents a share) for the same period last year.

The company said the loss resulted from start-up costs associated with two new businesses: aircraft maintenance and electronic processing of medical claims.

Revenue in the quarter ended June 30 dropped almost 1 percent, to $9.88 million from $9.95 million in the same period last year.

In the first six months of the year, Primark had a profit of $102,000 (8 cents), down 97 percent from $3.1 million (16 cents) a year ago. Revenue in the six-month period dropped 2 percent, to $18.9 million from $19.3 million.

Kirschner Medical Corp., based in Timonium, Md., said yesterday it earned $437,000 (18 cents) in the second quarter, down 66 percent from nearly $1.3 million (53 cents) a year earlier.

The company attributed the drop to expenses associated with the start-up of its medical video system, the expansion of its international sales organization and legal fees.

Revenue in the quarter increased 14 percent, to $16.6 million from $14.6 million.

For the first six months of the year, Kirschner earned $920,000 (38 cents), down 60 percent from $2.3 million (95 cents) a year ago. Revenue in the first half rose 17 percent, to $32.3 million from $27.5 million.

Kirschner develops, manufactures and markets orthopedic instruments and implants.