Penril Corp., the Rockville electronics company, reported a first-quarter loss of $108,000 (5 cents a share) for the three months ending Oct. 31, compared with profits of $770,000 (36 cents) for the same period of last year.

The firm reported that revenue declined to $19.5 million from $21 million.

Penril said its results "reflect an industrywide softness in the market demand for computer peripheral products and capital equipment."Schwartz Bros. Inc. profits soared nearly 900 percent for its most recent quarter -- to $192,252 (24 cents a share) from $19,352 (2 cents) for the same time period a year ago -- reflecting its decision to enter the video-cassette distribution business.

Sales for the quarter that ended October 31 rose 62 percent to $17.6 million from $10.8 million a year ago.

The profits came despite the company's decision to close its computer-products and its Virginia one-stop, record-and-tape wholesaling divisions.

For the first nine months of this year, Schwartz reported profits of $593,324 (74 cents) -- a 280 percent gain over the first nine months of last year when net income was $156,090 (19 cents).

Sales for the same time period increased 58 percent to $48 million from $30.3 million. Dart Group Corp. reported a 42 percent drop in net income for the latest quarter to $1.4 million (76 cents) from $2.5 million ($1.31).

Sales for the quarter were up 26 percent from $20.5 million last year to $26 million this year.

For the first nine months of the year, Dart reported a $9.7 million profit ($5.21), compared with the $79.6 million profit ($44) that it recorded for the same time period last year. But last year, the profits included the $75 million it gained from the sale of its drug-store chain, plus $1 million in profits from the drug stores.