Smith & Wollensky ( SWRG) ballooned 45% after Landry's ( LNY) offered to buy the New York-based restaurant operator for $7.50 a share. Smith & Wollensky shares were gaining $2.28 to $7.31. Landry's was up 26 cents, or 0.9%, to $30.45.

Zevex International ( ZVXI) surged after the Salt Lake City-based medical equipment maker agreed to be bought by Moog ( MOG.A) for $13 a share, with an $83.8 million maximum purchase price. The transaction will likely close in March. Zevex shares were trading up $3.40, or 36.3%, to $12.77. Moog was dipping 4 cents to $37.81.

Sinovac Biotech's ( SVA) fourth-quarter sales soared 56.8% to $6.27 million, the China-based company said, and full-year revenue rose to $15.4 million, up 78.7%. The company attributed these gains to growing demand for its hepatitis A vaccine, Healive. Shares were rising 40 cents, or 17%, to $2.80.

FX Energy ( FXEN) gained on word that its Winna Gora test well, located in central Poland, yielded gas flow in Rotliegendes-aged sandstone at a depth of about 3,500 meters. Shares of the company were up 99 cents, or 16.8%, to $6.89.

XTL Biopharmaceuticals ( XTLB) jumped after the New York-based company inked a deal with Dov Pharmaceutical to develop Dov's Bicifadine drug, which treats neuropathic pain. XTL will pay Dov potential fees in excess of $134 million, including $7.5 million cash upfront, milestone payments of $126.5 million in stock or cash, and royalties. Shares were climbing 58 cents, or 17%, to $3.98.

Actuate ( ACTU) slid on a downgrade by a JMP Securities analyst to market-perform from outperform. The California-based software company was off 58 cents, or 10%, to $5.22.

Innovex ( INVX) dropped after the electronic equipment maker nearly halved its revenue and swung to a fiscal first-quarter loss. Excluding restructuring charges, the Maple Plain, Minn., company lost $4.5 million, or 23 cents a share, in the quarter ended Dec. 31, on sales of $26 million. This compares with last year's profit of $160,000, or a penny a share, on $50.5 million in revenue. Shares were falling 15 cents, or 6.3%, to $2.25.

InnerWorkings ( INWK) shares were diving after Barron's published a piece that was critical of the company. Shares were losing nearly 20% to $12.99.

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