Zynga
Facebook and Zynga have revised their close partnership that has granted the struggling game developer a privileged position on the social network. Reuters

Active Network, Zynga Inc, Anheuser-Busch, Gilead Sciences, Cliffs Natural Resources, Tata Motors, Vodafone Group Plc, Tesla Motors, Cohen & Steers and Eaton Vance Corp. are among the companies whose shares are moving in the pre-market trading Wednesday.

Gainers

Active Network Inc. (NYSE:ACTV) stock rallied 22.30 percent to $4.99 in pre-market trading. The stock has a 52-week low of $3.83, a 52-week high of $17.24 and $248.69 million in market capitalization.

Zynga Inc. (NASDAQ:ZNGA) stock rallied 8.47 percent to $3.33 in pre-market trading. The company announced that it will launch two real-money games, ZyngaPlusPoker and ZyngaPlusCasino, for adults in the U.K. starting Wednesday. Meanwhile, Dan Porter, the head of Zynga's New York Studio and former chief executive of OMGPOP quit the social gaming company a year after its $180 million purchase of his mobile game start-up failed to produce the expected results.

Anheuser-Busch InBev N.V. (NYSE:BUD) stock gained 1.39 percent to $101.53 in pre-market trading. The stock has a 52-week low of $64.99, a 52-week high of $101.59 and $160.43 billion in market capitalization.

Gilead Sciences Inc. (NASDAQ:GILD) stock advanced 1.33 percent to $48.84 in pre-market trading. The stock has a 52-week low of $22.67, a 52-week high of $49.48 and $73.04 billion in market capitalization.

Cliffs Natural Resources Inc. (NYSE:CLF) stock gained 1.21 percent to $18.40 in pre-market trading. The company said Tuesday that it intends to announce unaudited 2013 first-quarter financial results after the U.S.-market close Wednesday, Apr. 24, 2013.

Losers

Tata Motors Ltd. (NYSE:TTM) stock plunged 3.79 percent to $23.64 in pre-market trading. The stock has a 52-week low of $23.64, a 52-week high of $30.85 and $78.37 billion in market capitalization.

Vodafone Group Plc (NASDAQ:VOD) stock plunged 3.42 percent to $28.40 in pre-market trading. Verizon Communications late Tuesday said that it is not currently considering any takeover bid for Vodafone, denying a report that it was discussing with AT&T Inc to buy the U.K. carrier. Verizon reiterated its interest to buy out Vodafone's 45 percent stake in Verizon Wireless, Bloomberg reported.

Tesla Motors Inc. (NASDAQ:TSLA) stock declined 2.57 percent to $43.20 in pre-market trading. The stock has a 52-week low of $25.52, a 52-week high of $46.68 and $5.08 billion in market capitalization.

Cohen & Steers Inc. (NYSE:CNS) stock declined 2.05 percent to $35.30 in pre-market trading. The stock has a 52-week low of $26.84, a 52-week high of $38.00 and $1.59 billion in market capitalization.

Eaton Vance Corp. (NYSE:EV) stock declined 1.21 percent to $40.88 in pre-market trading. The stock has a 52-week low of $22.97, a 52-week high of $42.18 and $4.98 billion in market capitalization.