Stocks: 3 things to know before the open

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Welcome back, investors!

Here are the three things you need to know before the opening bell rings in New York:

U.S. stock futures are ticking lower at the start of a shortened trading week. Oil is down more than 1.5% to below $38 dollars a barrel, a decline driven by Iran's pledge to increase output.

Related: Fear & Greed Index

1. Stock market movers -- Sharp, Adidas, China Telecom:

Shares in Japanese electronics giant Sharp (SHCAY) ended the day 7% higher after reports of a possible takeover bid.

Adidas (ADDDF) shares were down 0.5% in early trading after the sportswear maker's CFO warned of higher input costs in 2016.

China Telecom (CHA) shares were down as much as 3% after anti-graft regulators said they were investigating the state-owned firm's chairman.

Related: CNNMoney's Tech30

2. International markets overview: European markets are tracking lower in early trading, while Asian markets ended mixed. The Shanghai Composite closed down 2.5% while Tokyo closed 0.5% higher.

London is closed for the Boxing Day holiday.

3. Market recap: Markets were closed on Dec. 25 for Christmas. During the previous trading session, the Dow Jones industrial average closed down 0.3%, while the S&P 500 shed 0.2% and the Nasdaq was flat.

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