Shares of Sprint Nextel surged Thursday as it negotiated with Japanese wireless carrier Softbank, which might buy a controlling stake in the company.
Sprint Nextel's stock jumped 18% in morning trading.
"Sprint is currently involved in discussions with Softbank regarding a potential substantial investment by Softbank in Sprint," said Sprint in a prepared statement.
Sprint said "such a transaction could involve a change of control," but it emphasized that there are "no assurances" that the deal will go through.
The share price for Internet service provider Clearwire also surged, climbing 40% in morning trading, as CNBC reported that Clearwire might also get taken over as part of the deal.
Sprint Nextel is the third-largest wireless carrier in the United States, trailing AT&T and Verizon in market share. But the company has continued to lose money, despite finally adding Apple's iPhone to its network last year.
A spokesperson for Softbank Corp was not immediately available for comment.
There had been speculation that Sprint Nextel would make a counteroffer for MetroPCS, which recently agreed to merge with Deutsche Telekom's T-Mobile USA unit. Shares of MetroPCS fell 5% in early trading.