Among the companies with shares expected to actively trade in Monday's session are Sprint Corp. (S), NuPathe Inc. (PATH) and Solta Medical Inc. (SLTM).

Sprint is working toward a possible bid for rival T-Mobile US Inc. (TMUS), the Wall Street Journal reported, setting the stage for a telecom merger that if permitted by regulators would leave the U.S. wireless market dominated by three big companies. Sprint is studying regulatory concerns and could launch a bid in the first half of next year, the Journal reported. Sprint shares were up 4% to $8.77 premarket and T-Mobile was down 14 cents at $27.50. American depositary shares of Deutsche Telekom AG (DTEGY, DTE.XE), which holds a majority stake in T-Mobile, were up 2.8% at $16.05.

Endo Health Solutions Inc. (ENDP) agreed to acquire pharmaceutical company NuPathe Inc. (PATH) for about $105 million to gain the company's new migraine treatment. Endo will acquire NuPathe for $2.85 per share, a 24% premium to its close of $2.30 on Friday. NuPathe shareholders will receive rights to receive additional cash payments of up to $3.15 per share if the company's migraine treatment Zecuity meets certain sales milestones. NuPathe shares were up 51% at $3.48 in premarket trading.

Harvest Natural Resources Inc. (HNR) agreed to sell all the company's interest in Venezuela for $400 million in cash, as the energy company moves forward with its plans to sell itself. Shares were up 24% at $4.89 premarket.

Valeant Pharmaceuticals International Inc. (VRX) agreed to acquire medical device company Solta Medical Inc. (SLTM) for $250 million to increase its offerings in the growing aesthetic medicine market. Valeant is offering Solta shareholders $2.92 a share, a 40% premium to its Friday close of $2.09. Solta shares were up 39% at $2.91 premarket.

 
   Watch List: 
 

Allegheny Technologies Inc. (ATI) intends to close a Connecticut facility in 2014, a move the metal processor said will result in a $9.2 million charge to be recorded in the fourth quarter.

Asset management firm The Carlyle Group LP (CG) agreed to invest $200 million over three years to fund an oil-and-gas exploration companies offshore drilling programs in New Zealand and the Union of the Comoros.

Write to Tess Stynes at tess.stynes@wsj.com

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