U.S. futures slumped Monday, as investors fretted over the impact of the intensifying conflict between Israel and Hamas and looked ahead to fresh inflation data later this week.

Here are some of the biggest premarket U.S. stock movers today:

• Walt Disney (NYSE:DIS) stock rose 1.3% after the WSJ reported that Nelson Peltz’s Trian Fund Management has increased its stake in the entertainment giant and the activist investor is expected to request multiple board seats, including for himself.
• Citigroup (NYSE:C) stock fell 0.9% after the banking giant agreed to sell its retail wealth management portfolio in mainland China to HSBC (NYSE:HSBC), down 2.4%.
• United Airlines (NASDAQ:UAL) stock fell 2.8%, American Airlines (NASDAQ:AAL) stock fell 3% and Delta Air Lines (NYSE:DAL) stock dropped 3%, with several airlines having halted or reined in some flights to Israel following the escalation of violence between the country’s forces and Palestinian group Hamas.
• Spotify (NYSE:SPOT) stock fell 2.2% after Redburn-Atlantic downgraded its stance on the audio streaming service to ‘neutral’ from ‘buy’, estimating the company’s new audiobook offer will be gross margin dilutive.
• Exxon Mobil (NYSE:XOM) stock rose 2.5% and Chevron (NYSE:CVX) stock rose 2.6% after oil prices surged as the escalated conflict in the Middle East raised concerns about future global supply.
• Lockheed Martin (NYSE:LMT) stock rose 4.8%, Northrop Grumman (NYSE:NOC) stock rose 3.3% and RTX (NYSE:RTX) stock rose 3.6% as these defense stocks gain on the expectation of increased spending given the increased geopolitical tension.
• Bristol-Myers Squibb (NYSE:BMY) stock fell 1.3% after the pharmaceutical company said it will acquire cancer drugmaker Mirati Therapeutics (NASDAQ:MRTX), down 5.2%, for up to $5.8 billion, diversifying its oncology business.