Sprint (S) is reportedly in talks to acquire the remaining stake in Clearwire (CLWR), according to CNBC. While a deal isn’t believed to be imminent, the two companies are involved in “active negotiations” and could announce an agreement before the end of the year. Sprint already owns a 50.8% stake in Clearwire and has long been rumored to be interested in a full acquisition of the company. CNBC’s sources note, however, that a potential deal is still “fraught with difficulty” due to the complexity of their relationship and Sprint’s pending deal to sell a majority stake to SoftBank. Shares of Clearwire reacted positively to the news, jumping nearly 15% to $2.75 per share.