ConocoPhillips

The Delta variant could spell trouble for energy producers. Crude oil prices on Monday neared their lowest levels since May, as traders worry that travel restrictions and delayed office reopenings would limit fuel consumption. Governments and businesses have been imposing new restrictions in an attempt to slow the spread of the highly transmissible coronavirus variant. ConocoPhillips shares lost 1.9% Monday, while Valero Energy Corp. fell 0.8%.

AMC Entertainment Holdings Inc.

Soon you’ll be able to pay for your AMC movie ticket with bitcoin. The theater chain and popular meme stock said Monday that its U.S. locations would start accepting the cryptocurrency by the end of the year. It’s a move aimed at appealing to the company’s army of Reddit investors who rescued it from the brink of bankruptcy and boosted AMC shares to record levels. During AMC’s earnings call, Chief Executive Adam Aron also said revenue tripled in the second quarter, and the company was opening new locations thanks to the support of his new shareholder base. AMC shares fell 6.1% Tuesday.

Walt Disney Co.

“The Happiest Place on Earth” is getting a little more crowded. Walt Disney’s theme parks saw a strong rebound in visitors in the entertainment giant’s third quarter, a recovery that the company giant said Thursday had bolstered its balance sheet. Key resorts stayed open throughout the period, and Disney executives said its parks have more reservations for the future than there was attendance in the recent quarter. However, Disney acknowledged uncertainty ahead because of the Delta variant. Last month the company reinstated an indoor mask mandate at its theme parks in the U.S. regardless of vaccination status, amid rising Covid-19 cases. Disney shares closed 1% higher Friday.

Southwest Airlines Co.

Southwest sees stormy skies ahead. The airline said Wednesday that the recent surge in Covid-19 cases is causing bookings to slow and cancellations to rise. While demand for the key Labor Day weekend remained healthy, the carrier said the recent slowdown would make it difficult to turn a profit in the third quarter, excluding the impact of government payroll assistance. Southwest’s announcement reverses airline executives’ recent optimism, as rising coronavirus infections prompt cancellations of festivals and trade events. Slowing travel demand isn’t the only challenge airlines face. They are also contending with shortages of staff and aircraft spare parts, alongside bad weather, that have caused cancellations and delays. Southwest shares added 1.4% Wednesday.

Moderna Inc.

Some people with weakened immune systems have been cleared to get a Covid-19 booster shot. The U.S. Food and Drug Administration on Thursday authorized giving a third dose of a messenger-RNA Covid-19 vaccine from Pfizer Inc. and its partner BioNTech SE or from Moderna Inc. to certain people who are immunocompromised. On Friday, an advisory panel of the Centers for Disease Control and Prevention backed up that idea. The moves are likely the start of broader efforts aimed at better protecting against variants like Delta. Acting FDA Commissioner Janet Woodcock said other people who are fully vaccinated are adequately protected and don’t need an additional vaccine dose at this time. The agency is reviewing whether an additional dose might be needed in the future. Moderna shares closed 0.4% lower Friday.

Comcast Corp.

This year’s Olympics audience wasn’t gold-medal-worthy for NBCUniversal. The Tokyo Summer Games drew an average of 15.5 million prime-time TV viewers over their 17-day run, the Comcast-owned media conglomerate said. That is the lowest audience for the Summer Games since NBC started broadcasting them in 1988 and a 42% decline from the Rio de Janeiro Olympics in 2016. The company expected a drop in viewership due to this year’s Covid-related challenges, with some athletes unable to participate and no spectators allowed in the stands. Comcast shares ended 0.7% lower Monday.

DoorDash Inc.

People still have an appetite for delivery. DoorDash said Thursday that revenue rose 83% in its second quarter, as restaurants reopened across the U.S. and people began moving around again. The food-delivery company expects expanded offerings and delivery partnerships to spur growth amid uncertainty from the spread of the Delta variant. While the variant could boost the company’s near-term fortunes if it discourages people from going out again, executives said it doesn’t ensure growth at the same breakneck pace they saw in 2020. The pandemic served as an unexpected boon for DoorDash, which expanded into delivering everything from toothpaste to toilet paper during the crisis. DoorDash shares closed 3.5% higher Friday.

Write to Francesca Fontana at francesca.fontana@wsj.com