--Clearwire to hold a special shareholders meeting May 21 to vote on proposed merger with Sprint

--Crest encourages board to consider debt-financing offers from Crest and Aurelius Management Capital LP

--Crest says offers from itself and Aurelius are more favorable and less "coercive" to shareholders than Sprint's financing program

Investment firm Crest Financial Ltd. urged Clearwire Corp. (CLWR) to consider financing and spectrum-purchase offers from companies other than Sprint Nextel Corp. (S), again calling the terms of Sprint's $2.2 billion plan to acquire Clearwire "coercive."

Separately, Clearwire said it will hold a special shareholders meeting May 21 to vote on the proposed merger with Sprint.

In December, Sprint offered to buy the portion of Clearwire it doesn't already own in a $2.2 billion deal, and provided the wireless broadband operator up to $800 million in financing it could draw on in installments of $80 million over 10 months.

Sprint owns more than 50% of Clearwire and needs the majority of other shareholders to back the deal.

In a letter to Clearwire's board Tuesday, Crest encouraged the board to consider debt-financing offers from Crest and Aurelius Management Capital LP, saying both these offers are more favorable and less "coercive" to Clearwire shareholders than Sprint's financing program. It also urged Clearwire's board to seriously examine proposals by Verizon Communications Inc. (VZ) and Dish Network Corp. (DISH) to purchase some of Clearwire's spectrum.

Crest owns about 5.1% of Clearwire Class A shares, according to FactSet, and said it is the largest Clearwire shareholder unaligned with Sprint. Earlier this month, Crest proposed to provide Clearwire with $240 million in financing.

"By abandoning your independent build-out plans, tying yourself to Sprint, tightening the noose by taking Sprint's coercive debt, crying wolf about potential insolvency and failing to take the lifeline offered by Crest, Aurelius, and others, you have converted fair value for Clearwire into a super-premium for Sprint," wrote Crest General Counsel David K. Schumacher in the letter to Clearwire's board Tuesday.

Crest has sued to block Sprint's planned acquisition, claiming Sprint used its muscle as the largest shareholder to secure a cheap price in the deal. Crest also has petitioned the Federal Communications Commission in an effort to stop the deal and filed a preliminary proxy statement earlier this month urging Clearwire shareholders to vote against the plan. Sprint has called the lawsuit "baseless and without merit."

A Sprint spokeswoman said the company had no comment on the letter.

Crest's latest letter comes after Dish Network last week disclosed an unsolicited offer to acquire Sprint for $25.5 billion, saying the bid represents a 13% premium to a deal with SoftBank Corp. (9984.TO), the Japanese company that signed a $20.1 billion pact to buy Sprint in October. Sprint has formed a special committee to evaluate Dish's offer.

Clearwire shares rose 0.9% to $3.29 in Tuesday's regular session, and edged up another 0.9% to $3.32 after hours. The stock is up 14% since the start of the year.

Write to Nathalie Tadena at nathalie.tadena@dowjones.com

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