The largest premarket stock movers include Alibaba, JD.com, Occidental Petroleum, Chevron, and others.

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

The Chinese e-commerce sector was negatively affected by concerns about U.S. delistings and the impact of new Covid-19 outbreaks in Shenzhen, with Alibaba falling 4.7% and JD.com sinking 5.1% in the premarket.

Morgan Stanley downgraded the energy stocks Occidental and Chevron from "overweight" to "equal-weight," citing their recent outperformance and less attractive relative valuations. Both stocks fell in the premarket, with Occidental dropping 3.3% and Chevron sliding 2.4%. Additionally, both stocks are moving lower in tandem with the decline in crude prices this morning.

After Reuters reported that Germany planned to buy up to 35 Lockheed F-35 fighter jets, the defense contractor's shares increased by 1.6% in premarket trading.

According to a regulatory filing, Softbank's Vision Fund sold $1 billion of its stake in the South Korean software company, leaving it with 461.2 million Coupang shares. The stock slipped 1.2% in premarket trading.

According to a report in Automotive News, Ford is predicting a 12% decline in U.S. sales this year, with 100,000 units of production already lost due to parts shortages. However, Ford's stock price increased by 1% in premarket trading.

Berkshire is urging the rejection of four shareholder proposals, including the replacement of Warren Buffett as chairman and a proposal that Berkshire report on its plans to handle climate risk. Berkshire's stock price increased by 1% in the premarket.

In premarket trading, Rio's shares dropped 2.9% after the company announced it would purchase the remaining 49% of Turquoise Hill for approximately $2.7 billion. This represents a premium of over 32% compared to Turquoise Hill's closing price on Friday.

Tyson Foods' stock decreased by 1% in premarket trading after BMO Capital Markets changed its rating from "outperform" to "market perform." BMO cited valuation concerns, stating that Tyson has outperformed the S&P 500 over the past year, and the possibility of lower beef margins as reasons for the downgrade.