Among the companies with shares expected to trade actively in Monday's session are Ferro Corp. (FOE) and Aurizon Mines Ltd. (AZK, ARZ.T).

A. Schulman Inc. (SHLM) made public its offer to buy Ferro for about $563 million in cash and stock, showing the specialty-chemicals company continues to pursue a deal with its smaller peer after previously seeing an offer rejected. Ferro shares rose 28% to $6.65 in premarket trade, trading above A. Schulman's offer of $6.50 a share.

Silver producer Hecla Mining Co. (HL) agreed to acquire Aurizon Mines in a roughly C$796 million cash-and-stock deal that has the backing of the gold-mining company's board. Aurizon shares were up 7.6% to $4.54 before the market open in New York, while Hecla shares fell 9.1% to $4.22.

Stratasys Inc. (SSYS) reported its first quarterly results since its $1.4 billion merger with Objet Ltd., logging fourth-quarter earnings ahead of forecasts and predicting revenue growth for the upcoming year that was well ahead of expectations. Shares jumped 12% to $71.70 premarket.

Kroenke Sports & Entertainment LLC has proposed to buy all outstanding shares of sportsmen-focused cable-network operator Outdoor Channel Holdings Inc. (OUTD) for about $226.8 million, topping an earlier offer from another company. KSE, affiliated with U.S. businessman Stan Kroenke, is proposing to buy the company for $8.75 a share. Shares of Outdoor Channel jumped 14% to $8.60 premarket.

 
   Other Stocks to Watch: 
 

Annie's Inc. (BNNY) said certain shareholders will offer up to 3.5 million of the organic-foods company's shares. The selling stockholders are Solera Partners LP and SCI Partners LP, which together held 38% of Annie's shares. Annie's, which won't receive any proceeds from the sale, had more than 17.3 million shares outstanding as of Feb. 1.

Warren Buffett's Berkshire Hathaway Inc. (BRKA, BRKB) said fourth-quarter profit rose 49% as the conglomerate's insurance units shrugged off superstorm Sandy and its massive derivative bets benefited from rising markets.

Hartford Financial Services Group Inc. (HIG) restated its third-quarter 2012 results, resulting in a loss for the year instead of a profit, due to an accounting error related to a sale of its life-insurance operations.

The U.S. Justice Department is investigating a subsidiary of mortgage servicer Ocwen Financial Corp. (OCN) in connection with its participation in a mortgage-modification program, Ocwen said in a regulatory filing Friday.

Praxair Inc. (PX) said it expects to record a charge in the first quarter related to Venezuela's recent devaluation of its currency, the latest U.S. company anticipating an impact from the move.

Transocean Ltd. (RIG, RIGN.VX) swung to a fourth-quarter profit as a large impairment charge and loss contingencies weighed on the offshore-oil driller's year-ago results and as revenue improved in the latest period.

Write to Mia Lamar at mia.lamar@dowjones.com.

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