Among the companies with shares expected to actively trade in Monday's session are Sigma-Aldrich Corp. (SIAL), Apple Inc. (AAPL) and Clorox Co. (CLX).

German pharmaceutical company Merck KGaA (MKGAY, MRK.XE) on Monday said it would acquire Sigma-Aldrich for $17 billion to strengthen its position in the life-science industry. Sigma-Aldrich's shares jumped 34.6% to $137.82 in premarket trading.

Apple said it sold more than 10 million of its new iPhone 6 and iPhone 6 Plus devices during the first weekend of sales, a new high for the company even though the devices have yet to go on sale in China. Shares edged up 0.9% to $101.81 premarket.

Clorox said it is exiting Venezuela as that country's economic troubles make it increasingly difficult for international firms to operate there. The company also reaffirmed its fiscal 2015 guidance. Shares gained 5.8% to $95.80 premarket.

RadioShack Corp. (RSH) said Monday it has talked with a major vendor about potential changes to its commercial arrangement that could benefit a financial restructuring of the electronics retailer. Shares rose 7% to 97 cents premarket.

TriMas Corp. (TRS) reduced its full-year outlook for earnings per share by about 14%, while seeing revenue growth at the lower end of prior expectations. The company also agreed to acquire Allfast Fastening Systems Inc. for about $360 million. Shares fell 4.3% to $28.28 premarket.

AutoZone Inc. (AZO) said its fiscal fourth-quarter profit inched up while margins expanded, although sales declined because of fewer sales days during the period. Shares fell 1.2% to $520 premarket.

As underwriters unexpectedly were able to sell the overallotment as part of Alibaba Group Holding Ltd.'s (BABA) initial public offering, that means the company's market cap is $2.45 billion more than it was at Friday's close, putting it at $233.9 billion at Monday's market open. The IPO's proceeds were a record-breaking $25.03 billion. Shares were down 1% to $92.92 premarket.

Workers at five German Amazon.com Inc. (AMZN) logistics centers have walked out in a two-day strike to support demands for a collective wage agreement, the Verdi labor union said.

Tesco PLC (TSCDY, TSCO.LN) suspended four senior executives and called in outside auditors and legal counsel to investigate the $408.8 million overstatement of the U.K. supermarket operator's first-half profit.

German engineering company Siemens AG (SIE.XE, SIEGY) on Sunday announced a deal to acquire U.S. oil-equipment maker Dresser-Rand Group Inc. (DRC) for $7.6 billion. The Houston-based company is fetching $83 a share, in cash.

 
   Watchlist: 
 

Data-storage giant EMC Corp. (EMC), under pressure from shareholder activist Elliott Management Corp. and faced with the expected retirement of its longtime chief executive, is considering options that could include a merger deal with a rival, according to people familiar with the matter.

American Airlines Group Inc. (AAI) said it has reached a tentative agreement on a collective bargaining agreement for more than 24,000 of its flight attendants.

Dollar General Corp. (DG) began actively soliciting votes against a deal that would unite its two main rivals, ratcheting up its effort to acquire Family Dollar Stores Inc. (FDO). The move was disclosed in a securities filing Friday. Family Dollar's board has repeatedly spurned Dollar General in favor of a sale to Dollar Tree Inc. (DLTR).

 
   Barron's Watchlist: 
 

Starting next year, Bank of America Corp. (BAC) investors will get a glimpse of two things they haven't seen in years: a fairly clean income statement and a decent dividend, Barron's said in a recent report. By 2017, earnings per share could hit $2, versus an estimated 75 cents this year. More important, shareholders by then will have seen a string of steady increases in earnings and dividend payments, the report said.

 
 

Write to Tom Rojas at tom.rojas@wsj.com and Josh Beckerman at josh.beckerman@wsj.com

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