Nio, Veru, Sailpoint Technologies, and other stocks are experiencing significant price changes before the market opens.

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

The stock price of NIO, a Chinese electric vehicle manufacturer, decreased by 8.4% before the market opened, following the company's announcement of suspending production due to Covid-19-related supply chain disruptions.

The drugmaker's shares increased by 24.8% in the premarket after it announced "overwhelming" evidence of effectiveness for its experimental drug in treating hospitalized Covid-19 patients. The company will now seek emergency use authorization from the Food and Drug Administration for the treatment.

After agreeing to be acquired by private-equity firm Thoma Bravo for $6.9 billion or $65.25 per share, the cybersecurity company's shares surged 29.5% in premarket trading.

Twitter's stock price dropped 1.5% in the premarket after Elon Musk announced he would not be joining the company's board. Last week, Musk disclosed a 9.2% stake in Twitter, followed by news that he would be joining the board. No reason was given for the change of plans.

The e-commerce platform company's stock increased by 1.1% in the premarket after announcing a 10-for-1 stock split and the creation of a new "founder share" that would give CEO Tobi Lutke a 40% voting power increase from the current 34%.

After completing the spin-off of its WarnerMedia unit to Discovery Communications, AT&T's stock increased by 1.9% in the premarket. The newly combined Warner Brothers Discovery (WBD) will begin trading today under its new name and ticker symbol. Additionally, Deutsche Bank has named Warner Brothers Discovery a "top pick" due to its strong entertainment content.

Nvidia's stock price dropped by 3% in premarket trading after the company announced its intention to seek shareholder approval to double the number of authorized shares. This move would enable Nvidia to take actions such as stock splits and issuing equity incentives without requiring a further vote from shareholders.

Lowe's dropped 1% in the premarket after announcing that David Denton, its chief financial officer, would be leaving to take the same position at drugmaker PFE. Denton will be replaced by Senior Vice President Brandon Sink on April 30.

JetBlue is reducing its summer schedule to prevent flight disruptions and increasing hiring efforts. The airline's stock price increased by 1% in premarket trading.