NEW YORK ( TheStreet) -- Shares of online apartment finder Primedia ( PRM) were surging 54.1% to $6.75 after agreeing to be bought by private-equity firm TPG Capital for $7.10 a share in cash, or about $525 million.

The provider of products that fight biowarfare diseases, Siga Technologies ( SIGA), was surging 8.9% to $15.45, after announcing that it has won a five-year contract with the Biomedical Advanced Research and Development Authority of the U.S. Department of Health and Human Services to deliver 2 million courses of its smallpox antiviral product, ST-246, to the strategic national stockpile.

Exchange operator NYSE Euronext ( NYX) was plunging 8.7% to $37.35 after the NASDAQ OMX Group ( NDAQ)and IntercontinentalExchange ( ICE) announced that they are withdrawing their proposal to buy NYSE Euronext, following discussions with the U.S. Department of Justice antitrust division.

Shares of Lowe's ( LOW), the home-improvement retailer, were tumbling 5.1% to $24.45 in premarket trading Monday after saying its first-quarter earnings fell 5.7% and came in below analysts' estimates.

Joy Global ( JOYG), the maker of mining equipment, agreed to acquire LeTourneau Technologies from Rowan ( RDC) for $1.1 billion in cash. Rowan shares were trading sideways at $38.01.

Pay TV company Dish Network ( DISH) said Joseph Clayton has been named the company's new CEO, effective June 20.

Amylin Pharmaceuticals ( AMLN) is suing Eli Lilly ( LLY), accusing Lilly of anticompetitive activity and breaching alliance agreements with Amylin on maximizing the commercialization of diabetes treatment exenatide.

American International Group ( AIG) and the U.S. Treasury's $9 billion stock sale have drawn interest from investors for about half the offering, the Wall Street Journal reported, citing sources familiar with the situation.

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-- Written by Andrea Tse in New York.

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