(Reuters) - Winning U.S. regulatory approval for a $26 billion tie-up of Sprint Corp <S.N> and rival T-Mobile US Inc <TMUS.N> is the biggest hurdle to completing the deal, investors and analysts said on Monday.
Shares of Sprint closed down 13.7 percent at $5.61, and T-Mobile fell 6.2 percent to $60.51. Sprint's stock had gained 27 percent since April 10 following media reports that the companies restarted deal talks.
In situations with a risk that a deal will not win regulatory approval, stocks trade at a discount of 10 percent to 20 percent to the deal price, said Cowen analyst Colby Synesael.
Shareholders of Sprint, controlled by Japan's SoftBank Group Corp <9984.T>, would get $6.62 for every share held. Deutsche Telekom AG <DTEGn.DE>, T-Mobile's majority owner, would own 42 percent and control the board of the combined company.
The Federal Communications Commission must review whether the transaction is in the "public interest." A spokeswoman for FCC Chairman Ajit Pai declined to comment.
T-Mobile Chief Executive John Legere is scheduled to meet with two FCC commissioners in Washington on Tuesday to discuss the deal, people briefed on the matter said.
Two top U.S. House Democrats on Tuesday asked for a hearing on the merger. Representatives Frank Pallone and Mike Doyle said in a statement the deal "could also trigger ripple effects for everyone who uses a mobile phone."
"Considering that the combined company would be overwhelmingly controlled by foreign entities, this transaction also raises significant questions about foreign control of major players in the U.S. wireless market," they said.
Macquarie Research said in a note that uncertainty could result in a wide spread in shares as a "regulatory review" could delay the deal's closing beyond the first half of 2019. "The regulatory backdrop is unpredictable," it added.
The Justice Department's antitrust chief, Makan Delrahim, has expressed opposition to "behavioral remedies," preferring structural changes to ensure deals are not anti-competitive. Changes the government may require could take away from the $6 billion in run-rate synergies, Macquarie analysts said.
SoftBank CEO Masayoshi Son "rejected a deal with T-Mobile four months ago that was better for him than the deal he is taking now," said Jonathan Chaplin at New Street Research. "The market is assuming that things must be pretty bleak at Sprint for Masa to return to the negotiating table after a mere four months to take a lower offer."
Sprint and T-Mobile had called off their last merger talks in November, partly because SoftBank did not want to cede control of Sprint.
This time, the companies touted tax reforms from the Trump administration, synergies at present value of $43 billion, and plans to invest billions on developing a 5G network. They are also promising job growth and lower costs for wireless customers.
NO BREAKUP FEE
Sprint asked T-Mobile to be paid a breakup fee should regulators block their deal, people familiar with the confidential negotiations said, a standard form of insurance for acquisition targets when it comes to mergers with high antitrust risk.
However, T-Mobile managed to avoid it, arguing the deal was already generous enough for Sprint and that the companies should demonstrate confidence in the deal's regulatory prospects by having no such breakup fee, the sources said. With no appetite to terminate deal negotiations for the third time in four years, Sprint accepted, the sources said.
"The lack of a break-up fee suggests that both companies are willing to 'give it a try' from a regulatory point of view given the very significant synergies opportunities," Morgan Stanley analyst Simon Flannery said.
Under their contract, T-Mobile is still liable to pay Sprint a $600 million fee if it walks away from the deal despite it having been cleared by regulators and met other requirements to close, a regulatory filing on Monday showed.
Company officials told the FCC they expect to file a formal application with the commission by the end of May.
In September, the FCC approved a report that found, for the first time since 2009, there is "effective competition" in the wireless market, a finding that could help Sprint and T-Mobile make the case for the merger.
A decade ago, there were seven major U.S. wireless carriers and today the largest four carriers - led by Verizon Communications Inc <VZ.N> and AT&T Inc <T.N> - control 98.8 percent of the U.S. market, the FCC said.
In case the deal falls through, Sprint, with long-term debt of more than $32 billion, will be under much more stress than T-Mobile, analysts said.
However, brokerage Oppenheimer expects 80 percent approval probability, but with conditions.
Another analyst with CFRA Research estimated a 50 percent chance of regulatory approval.
(Reporting by Supantha Mukherjee and Laharee Chatterjee in Bengaluru and David Shepardson in Washington and Sheila Dang and Greg Roumeliotis in New York; editing by Bill Trott, Steve Orlofsky and Richard Chang)