Shares of Netrix Corp. jumped more than $2 last week after the company and its betrothed merger partner won a $10 million contract from Sonic Telcom Ltd, a privately owned Chantilly company that provides international voice and data communications.

Netrix will provide equipment to Sonic in partnership with OpenRoute Networks Inc., a Massachusetts company that announced plans in September to acquire Netrix. Netrix and OpenRoute make switches and other equipment used in packet-switched communications systems like the Internet.

The nearly 60 percent jump in Netrix stock led a list of big gains by small companies that helped produce a 2.3 percent increase in The Washington Post-Bloomberg regional stock index, which represents more than 200 publicly traded companies based in the District, Maryland and Virginia.

The index, rebounding steadily since Oct. 18, has gained more than 10 percent in the last four weeks, benefiting from the strong performance of the Nasdaq Stock Market, where the majority of regional stocks are traded.

Among the week's other winners:

Integral Systems Inc., the Lanham maker of satellite control systems, reported a big improvement in profitability. Quarterly earnings jumped more than $1 million to $1.36 million from $310,000, while revenue grew 44 percent to $11.1 million from $7.7 million.

Xybernaut Corp. of Fairfax, which makes wearable computers, reported that its revenue for the first nine months of the year jumped to $2.1 million from $617,000 as the market for its products finally started to take off.

AceCom Corp. of Gaithersburg, which makes telephone equipment, announced that it has gotten $800,000 in orders for its next generation of gear, which is used in the wireless Internet market.

Meridian Medical Systems, the Columbia-based maker of drug injection systems, won Food and Drug Administration approval to add a new painkiller to its product line.

--Jerry Knight (knightj@washpost.com)