U.S. stock futures drifted lower Monday after a steep drop in Chinese stocks weighed on markets around the world.

S&P 500 futures lost 10 points, or 0.5%, to 2067. E-mini Dow futures eased 104 points, or 0.6%, to 17417. E-mini Nasdaq-100 futures fell 32 points, or 0.7%, to 4530. Changes in stock futures don't always accurately predict moves after the opening bell.

The resurgence of sharp swings in Chinese stocks follows a few weeks of calm, sparking concerns that authorities are pulling back on measures to stabilize the market. The Shanghai Composite Index ended down 8.5%, its worst daily percentage loss since February 2007. Monday's drop came on the heels of weak economic news on Friday that exacerbated a selloff in several commodities.

"The government had put a number of measures in place to help support the market and the market has kind of overwhelmed those measures," said John Brady, managing director at futures brokerage R.J. O'Brien. "You're seeing a little bit of a panic trade in Chinese equity markets, and that's spilling over into global equities."

European stocks also fell. France's CAC-40 slipped 1.9% and Germany's DAX lost 1.9%.

Treasury prices rose as investors sought haven assets, pushing the yield on the 10-year note down to 2.236% from 2.271% on Friday.

Crude-oil futures slipped 1.1% to $47.62 a barrel. Gold futures rose 0.6% to $1092.00 an ounce.

On Monday morning, investors will receive readings on U.S. regional manufacturing activity and orders for big-ticket manufactured goods. The number of companies reporting earnings picks up later this week with results due from Ford Motor Co., Facebook Inc., and Procter & Gamble Co.

In corporate news, Teva Pharmaceutical Industries Ltd. said it would buy Allergan PLC's generics unit for $40.5 billion in cash and stock. Separately, Teva said it would drop its bid for Mylan NV. Teva shares rose 13% premarket, and those of Allergan added 8.5%.

U.S. stocks fell last week, propelling the Dow to its steepest point decline since December. The moves were driven by disappointing corporate reports from Apple Inc. and Biogen Inc., which prompted a broader selloff in highflying biotechnology stocks.

The euro rose against the dollar Monday. Still, the euro has tumbled 9.2% against the dollar this year, through Friday. ""Some big names ... have stated specifically that the strength of the dollar is crimping corporate profits," said Mr. Brady. "With stretched valuations and an adjustment taking place given the stronger dollar, it's really hard to see equities moving significantly higher from here."

Write to Saumya Vaishampayan at saumya.vaishampayan@wsj.com

Access Investor Kit for Facebook, Inc.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US30303M1027

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

Allergan (NYSE:AGN)
Historical Stock Chart
From Mar 2024 to Apr 2024 Click Here for more Allergan Charts.
Allergan (NYSE:AGN)
Historical Stock Chart
From Apr 2023 to Apr 2024 Click Here for more Allergan Charts.