NEW YORK (

TheStreet

) -- Shares of network storage specialist

Brocade

(BRCD)

, which reports its second-quarter results after market close on Thursday, slipped in premarket trading.

Early on Wednesday, the company announced several changes to its sales leadership in an attempt to improve focus and drive growth within key business areas.

Shares of Brocade, which have dipped almost 4% this year, were down 1.4% to $4.92 in premarket trading.

TheStreet Ratings

downgraded

Brocade to hold from buy on Wednesday with weak stock performance and a disappointing return on equity offsetting strength in net income and revenue growth.

SINA

(SINA) - Get Report

was one of the most active

Nasdaq

stocks in premarket trading on Wednesday after the Chinese Internet giant reported better-than-expected

first-quarter results

. Investors shrugged off the company's warning of future losses tied to increased investment in micro-blogging site

Weibo

. SINA's stock rose 12.48% to $58.13 on share volume of 308,267.

Social gaming specialist

Zynga

(ZNGA) - Get Report

was also active in premarket trading. Shares of the key

Facebook

(FB) - Get Report

partner rose 1.75% to $8.71 on share volume of 285,982.

--Written by James Rogers in New York.

>To follow the writer on Twitter, go to

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