Clearwire Corp.'s (CLWR) board recommended that investors sell their shares to Dish Network Corp. (DISH), in a move that shuns an earlier takeover agreement with majority owner Sprint Nextel Corp. (S).

The endorsement of Dish's $4.40-a-share offer puts the pressure on Sprint, which has seen its effort to buy the remaining half of Clearwire repeatedly disrupted by Dish. In supporting the Dish offer, the Clearwire board also recommended shareholders vote against the Sprint deal.

A shareholder vote on the Sprint deal scheduled for Thursday has been postponed--now for the third time--until June 24.

A Sprint spokesman said the company is evaluating Clearwire's statement and will review "any corresponding filings" before determining its next steps. Given Sprint's stake, Dish is seeking to become a major minority shareholder in Clearwire.

The struggle for control of Clearwire is likely to continue, despite the mobile broadband provider endorsing the Dish deal. Sprint and Dish have clashed over whether Clearwire can grant certain governance rights to Dish as part of its tender offer. Sprint suggested Wednesday that it was ready for a fight.

"Sprint continues to have every intention of enforcing its governance rights," the spokesman said in an emailed statement. "All commercial agreements, including network and customer agreements, will be honored and enforced as it regards our ongoing relationship with Clearwire."

Clearwire had initially agreed to sell its remaining shares to Sprint for $2.97 a share in December, but Dish came with a higher bid the next month for $3.30. Sprint raised its offer to $3.40 a share last month in the face of opposition from numerous Clearwire shareholders, but Dish launched a tender offer for $4.40 a share in late May.

The action by the Clearwire committee comes days after Sprint itself agreed to a higher buyout price from Japan's SoftBank Corp. (9984.TO), cutting off deal talks with Dish and giving Dish until June 18 to make its best and final offer for Sprint.

The arguments between Dish and Sprint over the Clearwire tender offer relate to the interpretation of Clearwire's complicated governance structure, along with the corporate law of Delaware, the home of Clearwire's incorporation.

Sprint has said Dish's offer is "not actionable" and that certain governance rights requested by Dish can't be legally handed over without consent of Sprint and some other shareholders. Dish has given a point-by-point rebuttal to Sprint's arguments and urged Clearwire's board to "correct the record."

Sprint has asserted its rights in its relationship with Clearwire and casts Dish as attempting to remove those protections. Sprint says rules put in place in a 2008 restructuring of Clearwire prevent Dish's requests from being workable.

Clearwire, founded in 2003 by cellular pioneer Craig McCaw, was restructured in 2008 through a combination of certain Sprint operations and $3.2 billion in cash from Sprint and other partners.

Dish argues that its tender offer is consistent with the rights of Sprint and that Sprint doesn't need to forfeit any rights.

As part of its proposal, Dish wants at least a 25% stake, along with governance rights and seats on the company's board.

Sprint already owns about half of Clearwire, but Clearwire's complicated governance structure has made for a sometimes difficult relationship between the two companies over decisions on how to best operate the smaller company.

Despite its holdings, Sprint still needs a majority of the minority holders to approve a takeover of Clearwire.

Anton Troianovski contributed to this article.

Write to Thomas Gryta at thomas.gryta@dowjones.com

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