June 4, 2012 5:00 AM

Investor buys about 8 percent of Clearwire, stock goes haywire

Clearwire Corp., the unprofitable company building a high-speed wireless network across the U.S., rose the most in almost two weeks after Crest Financial bought a 7.9 percent stake and said the shares are undervalued. Overland Park-based Sprint owns about 50 percent of Clearwire.

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