Take a look at some of the biggest movers in the premarket.

Uber (UBER) — Uber shares rose 5.7% in the premarket after the ride sharing company revised its financial outlook higher for the third period. According to an SEC filing, the company expects to report gross bookings of between $22.8 billion to $23.2 billion for its third quarter. On its second quarter earnings call, it previously predicted $22 billion to $254 billion in gross bookings.

Johnson & Johnson (JNJ) — Johnson & Johnson shares gained 0.8% in early morning trading after the pharmaceutical company said its Covid-19 booster shot is 94% effective when administered two months after the first dose in the U.S. The company said the booster increases antibody levels four to six times higher than just one shot

Apple (AAPL) — Shares of Apple ticked up 0.9% in the premarket after a Wall Street Journal report that the technology company is working on iPhone features to help identify depression and cognitive decline. According to the Journal, people who are familiar with this matter said that the features will use sensor data for health problems detection.

Chevron (CVX), Exxon Mobil (XOM) — Oil stocks rebounded in the premarket as crude prices rose. Chevron Mobil and Exxon Mobil both gained more than 1 percent in the premarket. Stocks were affected by Monday’s selloff, as worries about the global economy drove oil down.

Enphase Energy (ENPH) — Enphase Energy shares rose 1.8% in early morning trading after KeyBanc initiated coverage of the stock with an overweight rating. According to Enphase Energy, the company said that solar energy has a strong base and is growing.

Vail Resorts (MTN) — Vail Resorts shares added 1.7% in the premarket after KeyBanc upgraded the stock to overweight from sector weight. KeyBanc believes Vail Resorts will benefit from high demand for winter vacations.

Big Lots (BIG) — Shares of Big Lots fell 1.3% in early morning trading after Piper Sandler downgraded the retailer to neutral from overweight. According to the firm, Big Lots will be hurt by the ending of fiscal stimulus.