Finisar Corporation (NasdaqGS: FNSR) spiked 16.24 percent in price to $22.98 in afternoon trading Thursday. Volume of 6,927,403 shares easily doubled its normal full-day average volume and then some. The Sunnyvale, Calif.-based maker of optical networking equipment posted stronger-than-expected Q2 results for its fiscal second quarter thanks to growing demand. Its adjusted earnings of 44 cents per share sailed past Wall Street’s expectations of 38 cents, and its revenue of $240.9 million — a 65 percent increase from last year — also handily beat forecasts.

Cisco Systems Inc. (NasdaqGS: CSCO) did a fine business Thursday afternoon, dealing in 74,497,156 shares, surpassing its full-day average of 69,038,800. CSCO shares slid, however, 0.67 percent to $19.19.

Clearwire Corporation (NasdaqGS: CLWR) jettisoned 11.14 percent in price Thursday to $6.06, on volume of 5,948,322 shares, or more than twice its full-day average. The Kirkland, WA-based CLWR announced plans Thursday to sell more than $1.1 billion in debt after months of negotiations to stave off a looming funding gap as it spends billions on building a new wireless network.