The top pre-market NASDAQ Stock Market gainers are: CNinsure, Telestone Technologies, EnerNOC, Tranzyme and SIGA Technologies. The top pre-market NASDAQ Stock Market losers are: Sina Corp, ANADIGICS, ARM Holdings, NASDAQ OMX Group and Baidu.

Gainers:

CNinsure Inc. (NASDAQ:CISG) shares climbed 25 percent to $16.45 in pre-market trading session. The company announced its Board of Directors has received a preliminary non-binding proposal letter dated May 14, 2011, from TPG Asia V MU Inc. to acquire all of the outstanding ordinary shares of the Company, other than certain American Depositary Shares (ADSs) or ordinary shares held by the Founder and CDH, in a going private transaction for $19.00 per ADS, or $0.95 per ordinary share, in cash, subject to certain conditions.

Telestone Technologies Corp. (NASDAQ:TSTC) shares surged 12.79 percent to $7.85 in pre-market trading session. The company swung to first quarter net income of $0.13 per share compared to net loss of $0.11 per share in the same quarter last year.

EnerNOC, Inc. (NASDAQ:ENOC) shares gained 6.86 percent to $18.22 in pre-market trading session. The company stock was upgraded to a “neutral” rating from “underperform” rating at Zacks Investment Research.

Tranzyme, Inc. (NASDAQ:TZYM) shares gained 6.85 percent to $5.30 in pre-market trading session. The company stock was surged 22.17 percent in regular trading session on Friday.

SIGA Technologies Inc. (NASDAQ:SIGA) shares advanced 5.71 percent to $15.00 in pre-market trading session. The company stock was upgraded to a “neutral” rating from “underperform” rating at Zacks Investment Research.

Losers:

Sina Corp. (NASDAQ:SINA) shares declined 2.6 percent to $104.10 in pre-market trading session. The stock has a 52 week low of $33.93 and 52 week high of $147.12 and has $6.51billion market capitalization.

ANADIGICS, Inc. (NASDAQ:ANAD) shares declined 1.99 percent to $2.95 in pre-market trading session.

ARM Holdings plc. (NASDAQ:ARMH) shares declined 1.65 percent to $28.04 in pre-market trading session after its chairman Doug Dunn announced his plan to step down from the role before 2012 annual general meeting.

NASDAQ OMX Group, Inc. (NASDAQ:NDAQ) shares declined 1.52 percent to $26.50 in pre-market trading session after NDAQ and IntercontinentalExchange (ICE) announced that they are withdrawing the joint proposal they made in April, 2011 to acquire NYSE Euronext and will not commence the exchange offer to acquire all of the outstanding shares of NYSE Euronext.

Baidu, Inc. (NASDAQ:BIDU) shares declined 1.36 percent to $129.50 in pre-market trading session.