Some Clearwire Corp. (CLWR) shareholders have formed a group with the aim of getting a higher buyout price for the mobile broadband provider than the one currently in place from Sprint Nextel Corp. (S).

In December, Clearwire's majority owner, Sprint, offered to buy the rest of Clearwire that it doesn't own for $2.2 billion, or $2.97 a share. The next month, satellite TV company Dish Network Corp. (DISH) bid $3.30 a share, and Clearwire shares have traded well above the Sprint offer since. Dish since has bid for the entirety of Sprint, putting its Clearwire bid in question.

In a regulatory filing Friday, the four shareholders--Mount Kellett Capital Management, Highside Capital Management, Glenview Capital Management and Chesapeake Partners Management--said they hold a collective 127.4 million shares, or about 18.2% of the non-Sprint shares outstanding. They intend to act as a group in beginning discussions with Sprint and other interested parties, including Dish, about the deal.

Spokespeople from Clearwire, Sprint and Dish declined to comment. Clearwire shareholders are set to vote May 21 on the deal.

The filing said the group members "unanimously believe that such price offered by Sprint is too low" and they have retained legal counsel to assist in any negotiations. The group members have agreed not to sell or transfer their shares before May 22, when the pact will end unless members holding a majority of the group shares decide to end it earlier.

Sprint owns more than 50% of Clearwire and needs a majority of other shareholders to back the deal, but the group joins other funds that are opposing the deal.

Crest Financial and Aurelius Capital Management are separately suing to block the deal, and Crest has plans to launch a proxy fight against the shareholder vote.

Sprint, which has agreed to sell a 70% stake to Japan's SoftBank Corp. (9984.TO), has expressed confidence in closing the Clearwire deal by July 1. Clearwire's board has continued to support the Sprint agreement.

Earlier this week, SoftBank Chief Executive Masayoshi Son said he doesn't see a need for a higher bid because Sprint will have control over Clearwire and its board even if the shareholder vote fails.

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

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