Stock futures traded mostly lower Monday morning amid a slump in crude oil prices. 

S&P 500 futures were down 0.09%, Dow Jones Industrial Average futures slid 0.19%, while Nasdaq futures rose slightly. 

Dow 20,000 came agonizingly close on Friday, but building momentum flagged in the final moments to fall short of the milestone. The Dow came within a point of the level in the afternoon session before backing off, just as it has for weeks. The S&P 500 and Nasdaq each closed at fresh records.

Crude oil prices pulled below $53 a barrel on Monday, continuing to trade off of data late Friday that showed rising U.S. production. A weekly reading on U.S. activity showed the number of U.S. oil rigs climb for the 10th consecutive week in a row. Commodities trading has been erratic in the past week as investors weigh U.S. production against an agreement among major oil-producing nations designed to rebalance markets. A production cut agreement among Organization of Petroleum Exporting Countries and other non-OPEC producers took effect at the beginning of the year. 

West Texas Intermediate crude was down 2% to $52.89 a barrel on Monday morning. 

The British pound tumbled more than 1% overnight after Brisith Prime Minister Theresa May suggested a full withdrawal from the European Union, conflicting with a former ambassador to the EU who had suggested the approach so far had been "muddled." May told Sky News that the U.K. would no longer be a member of the EU and that she would provide "more details in the coming week as we look ahead to triggering Article 50."

Pet health care company VCA (WOOF) agreed to be acquired by Mars Inc. on Monday in a deal worth $9.1 billion. Snacks and petcare company Mars agreed to purchase VCA for $93 a share, a roughly 31% premium to its close on Friday. The deal is slated to close in the third quarter of this year. 

Ariad Pharmaceuticals (ARIA) surged 74% after Takeda Pharmaceutical agreed to acquire the drugmaker in a deal worth $5.2 billion. Takeda offered to purchase Ariad for $24 a share, valuing the drugmaker at a premium of 75% compared to its closing price on Friday of $13.74. The all-cash deal is expected to close by the end of February. 

Urban Outfitters (URBN - Get Report) moved lower after saying same-store sales over the critical holiday shopping season increased 3%, while total same-store sales climbed 1.5%, which was less than expected. Same-store sales at its Urban Outfitters stores increased 3.6%, while Anthropologie sales declined 1%. 

Francesca's Holdings (FRAN - Get Report) climbed 3% after upping its fourth-quarter outlook. The retailer anticipates earnings for its January-ending quarter between 35 cents and 37 cents a share. Francesca's had previously targeted 33 cents to 37 cents a share. Its fourth-quarter same-store sales outlook was also revised from an expected 1% decline to expected 1% growth.  

Fiat Chrysler (FCAU - Get Report) added more than 2% in premarket trading after outlining plans to invest $1 billion in plants in Michigan and Ohio, adding 2,000 new jobs to the U.S. The move comes after President-elect Donald Trump took aim at a number of automakers via Twitter in which he criticized any plans to ship jobs oout of the U.S. and threatened to impose border taxes. 

Merrimack Pharmaceuticals (MACK) shot 37% higher in premarket trading after drugmaker Ipsen agreed to buy some of its assets, including its drug for pancreatic cancer, in a deal worth more than $1 billion. Merrimack also said it would eliminate about 80% of its staff as it refocuses its pipeline.

McDonald's (MCD - Get Report)  crept higher after selling a majority stake in its operations in China to Carlyle Group (CG - Get Report) and a state-backed investment group for around $2.1 billion. The agreement would see McDonald's part with 80% of its 2,200 stores in China and Hong Kong. The world's largest hamburger chain intends to keep a minority stake in the region.