Market Close: Big Winners & Losers for April 2, 2013 (BGCP, BOSC, OPTR, TCCO, CHCI, IGOI, SPEX, CLNT, NDAQ, NAT)

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Here are today’s five biggest gaining stocks at closing:

BGC Partners Inc. (NASDAQ: BGCP) is up 48.3% at $5.71.

B.O.S. Better Online Solutions Ltd. (NASDAQ: BOSC) is up 20.3% at $3.85.

Optimer Pharmaceuticals Inc. (NASDAQ: OPTR) is up 19.6% at $13.96.

Technical Communications Corp. (NASDAQ: TCCO) is up 19.1% at $5.30.

Comstock Holding Companies Inc. (NASDAQ: CHCI) is up 17.4% at $2.36.

And here are today’s five biggest losing stocks at closing:

iGo Inc. (NASDAQ: IGOI) is down 35.8% at $2.49.

Spherix Inc. (NASDAQ: SPEX) is down 13.2% at $7.29.

Cleantech Solutions International Inc. (NASDAQ: CLNT) is down 13.2% at $3.10.

The Nasdaq OMX Group Inc. (NASDAQ: NDAQ) is down 13% at $27.86.

Nordic American Tankers Ltd. (NYSE: NAT) is down 11.1% at $9.80.