The top aftermarket NYSE losers on Wednesday were: BankUnited, Kemet Corp, Arrow Electronics, Nordic American Tankers, Ferro Corp, Omega Protein, Callaway Golf, Vanguard Natural Resources, Venoco and Calgon Carbon Corp.

BankUnited, Inc. (NYSE:BKU) shares slumped 11.14 percent to $22.17 in post-market trading sessions. The company announced on Wednesday that it decided to remain independent after receiving takeover offers that were lower than expected.

Kemet Corp. (NYSE:KEM) shares plunged 9.76 percent to $7.95 in aftermarket trading sessions. The company stock climbed nearly 11 percent in regular trading sessions.

Arrow Electronics, Inc. (NYSE:ARW) shares plunged 7.91 percent to $37.85 in aftermarket trading sessions. The company announced it has agreed to acquire TechTurn, Ltd., a provider of electronics asset disposition (EAD) services that specializes in the processing and sale of technology devices that are returned or recycled from businesses and consumers.

Nordic American Tankers Ltd. (NYSE:NAT) shares declined 7.51 percent to $14.40 in post-market trading sessions. The company on Wednesday announced an underwritten public offering of 5,500,000 common shares.

Ferro Corp. (NYSE:FOE) shares declined 5.43 percent to $6.09 in post-market trading sessions. The stock has a 52-week low of $4.27, a 52-week high of $17.84 and $527.22 million in market capitalization.

Omega Protein Corp. (NYSE:OME) shares declined 5.4 percent to $7.78 in post-market trading sessions. The company stock climbed more than 11 percent in regular trading sessions.

Callaway Golf Co. (NYSE:ELY) shares declined 4.99 percent to $5.90 in aftermarket trading sessions.

Vanguard Natural Resources LLC (NYSE:VNR) shares declined 4.19 percent to $27.65 in aftermarket trading sessions. The company announced that its board of directors has declared a cash distribution attributable to the fourth quarter of 2011 of $0.5875 per unit payable on February 14, 2012 to unit holders of record on February 7, 2012.

Venoco, Inc. (NYSE:VQ) shares declined 3.76 percent to $9.99 in post-market trading sessions. Faruqi & Faruqi, LLP is investigating the Board of Directors of VQ for potential breaches of fiduciary duties in connection with their conduct related to the sale of the company to its Chief Executive Officer, Timothy Marquez.

Calgon Carbon Corp. (NYSE:CCC) shares declined 3.47 percent to $15.60 in aftermarket trading sessions.

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