Chemical company ShengdaTech Inc. (Nasdaq: SDTH) said it expects net income of about $23 million in fiscal year 2007. The guidance is 31% higher than the China-based company’s $17.5 million net income in 2006.

Yadkin Valley Financial Corp. (Nasdaq: YAVY) announced it is buying Cardinal State Bank (Nasdaq: CSNC) for about $41.8 million, or $17.62 per share, in cash. Yadkin expects to complete the deal in the fourth quarter of 2007.

Silverleaf Resorts, Inc. (Nasdaq: SVLF) raised its full-year profit guidance, citing boosted Vacation Interval sales and interest income.

Australian investment firm Babcock & Brown Ltd. (ASX: BNB) announced it is buying laundry services business Coinmach Service Corp. (AMEX: DRA) for $713 million.

Hawkins, Inc. (Nasdaq: HWKN) reported a profit of $1.8 million, or $0.18 per share, for the fourth quarter ended April 1, compared with a $1.3 million profit, or $0.13 per share, a year earlier.

These are the biggest percentage gainers in Friday's trading among companies with market capitalizations under $500 million:

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