Stock futures were tumbling on Monday as the conflict in the Middle East jolted global markets.

These stocks were making moves in premarket trading:

Chevron and Exxon were up 4% and 4.4%, respectively, after U.S. an Israeli attacks on Iran and Tehran retaliation sparked a surge in oil prices. The Brent and West Texas crude benchmarks were both up about 8% in early trading on Monday as investors fretted that the fighting would disrupt shipments through the Straits of Hormuz.

Other oil stocks were also climbing. apache was the S&P 500's best performer ahead of the opening bell, soaring 8%. ConocoPhillips advanced 7%, Coterra Energy Inc. rose 6%, Devon leapt 6%, Diamondback Energy rallied 7%, EOG Resources surged 5%, Halliburton added 5%, and Occidental gained 7%.

Shares in cruise-line operators tumbled as investors fretted that the surge in oil prices would drive up fuel costs. Carnival was the S&P 500's worst performer, plunging 7%. Norwegian Cruise Line fell 7% ahead of its fourth-quarter earnings, and Royal Caribbean Cruises dropped 7%.

Airline stocks also slumped. American Airlines declined 6%, Delta Air Lines slid 5%, and United Airlines was 6% lower.

Defense contractors were rallying as the conflict raged on. General Dynamics climbed 4%, L3Harris Technologies, Inc. added 5%, Lockheed jumped 7%, Northrop Grumman gained 6%, and RTX Corp rose 8%.

Berkshire Hathaway slid 1.6% after the investing conglomerate reported its fourth-quarter earnings on Saturday. Berkshire's operating profit after taxes fell 30% from a year ago and the company bought back none of its own stock in the period. The results covered Warren Buffett's final three months as the company's CEO.

EchoStar, Venture Global, Archer Aviation, Asana, AST SpaceMobile, BigBear.ai, Core Scientific, Credo Technology Group, MongoDB, Quantum Computing, Plug Power, and Riot Platforms are all set to report earnings on Monday.