The top pre-market NASDAQ stock market losers are: optionsXpress Holdings, Gulfport Energy, Veeco Instruments, Horizon Technology Finance, Bruker, NGP Capital Resources, SunPower, Huntington Bancshares, Logitech International, and Powerwave Technologies.

optionsXpress Holdings, Inc. (OXPS) lost 13.71 percent to $17.43 in the pre-market trading.

Gulfport Energy Corp. (GPOR) plummeted 8.43 percent to $20.32 in the pre-market session. The company announced a public offering of 3.4 million shares of common stock by Charles Davidson and one of his affiliates. Immediately prior to this offering, Davidson beneficially owned about 34 percent of Gulfport's common stock. Gulfport will not receive any proceeds from the sale of shares in this offering.

Veeco Instruments Inc. (VECO) plunged 4.94 percent to $47.50 in the pre-market trading.

Horizon Technology Finance Corp. (HRZN) fell 2.44 percent to $14.80 in the pre-market session.

Bruker Corp. (BRKR) tumbled 2.35 percent to $17.05 in the pre-market trading. The company said it received a contract for 10 production systems for the Improved Point Detection System – Lifecycle Replacement (IPDS-LR) program through the Joint Program Executive Office for Chemical and Biological Defense (JPEO-CBD) for chemical detection use by the United States Navy.

NGP Capital Resources Co. (NGPC) dropped 2.28 percent to $9 in the pre-market session.

SunPower Corp. (SPWRA) decreased 2.06 percent to $13.30 in the pre-market trading.

Huntington Bancshares Inc. (HBAN) declined 1.84 percent to $6.54 in the pre-market trading. The company said it priced a public offering of 146.03 million shares of its common stock at $6.30 a share, or $920.0 million in aggregate gross proceeds.

Logitech International SA (LOGI) moved down 1.76 percent to $19.53 in the pre-market session.

Powerwave Technologies Inc. (PWAV) fell 1.67 percent to $2.35 in the pre-market session.

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