Stratagene ( STGN) surged nearly 26% Monday after Agilent Technologies ( A - Get Report) agreed to buy the biotech for $10.94 a share -- a 28.6% premium to its latest closing price. The deal, announced on Friday, should close in about 90 days. Shares of La Jolla, Calif.-based Stratagene were up $2.19 to $10.70. Agilent stock was recently up 37 cents, or 1.1%, to $35.08.

USA Technologies ( USAT) was flying high after Coca-Cola United, a major soft-drink distributor, agreed to use the Malvern, Pa., company's credit-card-payment technology in its vending machines. Terms weren't disclosed. Shares were soaring $1.57, or 18.8%, to $9.90.

Virginia's SteelCloud ( SCLD) jumped on word it had rewon a more than $8 million contract with the U.S. Postal Service for its specialized servers. A loser in an earlier bid had challenged the original contract SteelCloud won in December, which had been worth nearly $10 million. Still, shares were leaping 22 cents, or 17.3%, to $1.49.

Security-software maker Sourcefire ( FIRE) plummeted some 28% after announcing it expects to lose between $2.2 million and $2.6 million on a GAAP basis in the first quarter. Revenue should range between $10.1 million and $10.5 million -- at least $1 million under the only analyst's estimate, according to Thomson Financial. The Columbia, Md., company was down $4.92 to $12.43.

Carrington Laboratories ( CARN) was issued a going-concern warning from auditors, given its recently reported 70-cents per-share operations losses last year. The Texas-based company is also in default to its current credit facility and needs more financing as a result. Shares were off 46 cents, or 19.1%, to $1.95.

HandHeld Entertainment ( ZVUE), maker of Zvue portable-media players, was also hit hard after announcing its own going-concern warning from auditors due to its history of losses. Shares of the San Francisco-based company were sinking 30 cents, or 11.3%, to $2.35.

QMed ( QMED) tumbled after revenue for the quarter ended Feb. 28 missed two analysts' targets. The Eatontown, N.J.-based company made $6.3 million, less than the $7.7 million mean target, but doubled from last year. The company, which makes systems for clinical-information management, also announced that chief operating officer Jane Murray was appointed CEO. Shares were down by 49 cents, or 10.6%, to $4.15.

A U.S. District Court ruled Friday that Vonage ( VG - Get Report) is barred from adding any new customers in connection with Verizon's ( VZ) patent-infringement case against the Internet phone company. Vonage was granted a temporary stay of the order, but its shares were down 36 cents, or 10.7%, to $3.01. Verizon was lately unchanged at $38.

Carrier Access ( CACS) expects to lose between 29 cents and 24 cents a share in the first quarter (excluding items), missing the street's consensus by at least 3 cents a share. Revenue should range from $8.3 million to $8.7 million, well under the $14.1 million average mean projection. The Boulder, Colo., telecommunications-equipment maker surrendered 50 cents, or 9.9%, to $4.56.