ActivIdentity

( ACTI) was one of Tuesday's small-cap winners as the Fremont, Calif.-based company said it landed major contracts from the Defense Department, the Army and the Air Force. Shares were trading up 56 cents, or 12.3%, to $5.10.

Government Properties Trust

(GPT)

surged on news the Omaha, Neb.-based REIT had agreed to be acquired by Record Realty Trust, an Australian company, for $10.75 a share in cash. The price represents a 17.2% premium over Government Properties' closing share price Monday. Shares were climbing $1.30, or 14.2%, to $10.47.

Arena Pharmaceuticals

(ARNA) - Get Report

stumbled after the San Diego-based biopharmaceutical company was downgraded by A.G. Edwards to hold from buy. Shares were sinking $1.72, or 10.2%, to $15.19.

PowerDsine

( PDSN) climbed on word the Israeli semiconductor company agreed to be acquired by Irvine, Calif.-based

Microsemi

(MSCC)

for about $245 million in cash and stock. The deal values PowerDsine at $11 a share, an 18.5% premium to its last closing stock price. Separately, PowerDsine swung to a third-quarter loss of $560,000, or 3 cents a share, compared with income of $898,000, or 4 cents a share, a year ago. Shares of PowerDsine were gaining $1.04, or 11.2%, to $10.32, while Microsemi was tumbling $2.03, 11.1%, to $16.33.

Forward Air

(FWRD) - Get Report

lost ground after the Greeneville, Tenn.-based company missed Wall Street's third-quarter earnings expectations. The company reported income of $12.7 million, or 41 cents a share, up from $12.1 million, or 38 cents a share, a year ago. Revenue increased 6.6% to $90.4 million. Analysts polled by Thomson First Call were looking for earnings of 44 cents a share on $94.5 million in revenue. Shares fell $3.68, or 10.3%, to $32.08.