Stocks making the biggest moves midday: Boeing, Carnival, Goldman Sachs and more

Check out the companies making headlines in midday trading.

Delta, United, American Airlines, Boeing — Airline stocks fell in tandem as concerns about a rebound in Covid-19 cases intensified.  Shares of Delta fell more 3.7%, American Airlines shares lost 4.1% and United shares declined 5.5%. Aircraft manufacturer Boeing's stock also fell 4.9%. Covid cases have ticked up in the U.S. this month with the delta variant spreading among the unvaccinated.

Carnival, Norwegian Cruise Line — Shares of cruise line operators were among the biggest laggards amid Monday's broad sell-off. Carnival and Norwegian Cruise Line dropped more than 5% each, while Royal Caribbean fell nearly 4%. The decline came as the U.S. is averaging nearly 30,000 new cases a day in the last seven days ending Friday, up from a seven-day average of around 11,000 cases a day a month ago, according to CDC data.

Diamondback Energy, Devon Energy, Marathon Oil — Shares of oil companies sunk amid falling U.S. oil prices as OPEC and its allies agreed to raise output. West Texas Intermediate crude futures fell below the key $70 level Monday for the first time in more than a month. Diamondback Energy slid 6.6%. Marathon Oil fell 5.4%. Devon Energy erased 3.3%. Chevron shed 2.7%, while Exxon Mobil declined 3.4%.

JPMorgan, Morgan Stanley, Goldman Sachs — Bank stocks took a hit Monday as bond yields plummeted, crimping their profitability prospects. JPMorgan dropped more than 3% while Morgan Stanley, Goldman Sachs, Wells Fargo, Bank of America and Citi all slide more than 2%.

Peloton, Chewy, DoorDash — Shares of companies that benefited from consumers staying at home amid the pandemic saw a boost on Monday as concerns of the spreading delta Covid variant heightened. Exercise company Peloton added 7.1%. Pet supplies online retailer Chewy gained 6.8% each. Food delivery service DoorDash rose 4.9%.

Kroger, Albertsons — Investors also flocked into grocery store stocks, which were major pandemic beneficiaries. Albertsons climbed 3.4% and Kroger gained 4.3% amid worries about rising Covid cases. "If this plays out and Covid starts to rear its head again and things start to shut down, you'd see grocery benefit from that," said Brian Yarbrough, a retail analyst for Edward Jones.

Tractor Supply – Tractor Supply's stock fell 4.3% despite a better-than-expected second-quarter earnings report. The farm equipment and services company posted quarterly earnings of $3.19 per share on revenues of $3.6 billion, beating analysts' earnings estimate of $2.96 per share on revenues of $3.46 billion.

Zoom Video — Shares of the video conferencing company dipped 2.2% on Monday after accounting that it's buying Five9, a provider of cloud contact center software, in an all-stock transaction valuing the company at $14.7 billion. The deal marks Zoom's first billion-dollar acquisition.

Moderna – Moderna shares added 9.5%, continuing the stock's climb after news last week that the pharmaceutical company would join the S&P 500 on Wednesday, July 21. Moderna will replace Alexion Pharmaceuticals, which is being acquired by AstraZeneca.

— CNBC's Yun Li, Maggie Fitzgerald and Tanaya Macheel contributed reporting