Boeing, Anaplan, Nielsen Holdings, and other stocks are experiencing significant premarket movements.

Check out the companies making headlines before the bell:

A Boeing 737-800 operated by China Eastern Airlines crashed in the mountains of southern China with 132 people aboard, and Boeing shares sank 5.8% in the premarket.

Private-equity firm Thoma Bravo agreed to buy out business planning software company Anaplan for $10.7 billion, or $66 per share in cash. Anaplan's stock had closed at $50.59 per share on Friday, and the stock surged 28.3% in the premarket.

Nielsen's stock price dropped 18.6% in premarket trading after the company rejected a $9.13 billion takeover bid of $25.40 per share from a private-equity consortium, stating that the offer significantly undervalued the company, which is best known for its TV ratings.

Berkshire Hathaway (BRK.B) is acquiring the insurance company for $11.6 billion in cash, or $848.02 per share, which is higher than Alleghany's Friday closing price of $676.75 per share. Alleghany will continue to operate as an independent subsidiary of Berkshire.

Softbank sold its $2.1 billion stake in GM's Cruise division, and GM announced it would invest an additional $1.35 billion in the cruise industry, replacing funds that Softbank had pledged to provide. GM initially fell more than 1% in the premarket but then pared those losses.

At the end of March 2023, SAP will lose its Chief Financial Officer, Luka Mucic, who has been with the company since 2015. As a result, SAP's stock price fell 2% in the premarket.

Deutsche Bank upgraded Manchester United's shares from "hold" to "buy," stating that the soccer team is undervalued compared to its peers in the sports and live events category. Manchester United's stock price increased by 1.6% in premarket trading.

Nio stated that it has no immediate plans to increase the prices of its electric vehicles, although it remains flexible on pricing. Similarly, TSLA and BYD have recently raised their prices due to rising material costs.

RBC upgraded BlackBerry's communication software company stock from "underperform" to "sector perform," resulting in a 2.1% increase in the premarket. The stock's price is now considered more aligned with the company's fundamentals.