Clearwire (CLWR), a Kirkland, WA-based wireless products company, is up 24 cents to $5.22 and options volume is running 26X the normal levels on increasing interest in April and May calls at the $5 strike. 3,500 contracts traded so far and, with almost all of the trades hitting ask-side and very little existing open interest, it looks like call buyers are dominating the trading activity. The company’s WiMax technology was featured in a Forbes article today.