In the premarket, defense stocks and other companies are experiencing significant price changes.

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

Berkshire reported a record annual profit in 2021, largely due to its investment in AAPL. The company also bought back a record $27 billion in stock last year, but the pace of buybacks slowed during the fourth quarter. Berkshire Class “B” shares fell 1% in the premarket.

Following Russia's invasion of Ukraine, BP announced it would sell its nearly 20% stake in Rosneft, resulting in a 7.1% decline in BP shares in the premarket.

Toronto-Dominion agreed to acquire First Horizon in an all-cash deal worth $25 per share or $13.4 billion, which will help the bank expand its presence in the southeastern part of the U.S.

Renewable Energy shares surged 36.5% in the premarket after the company agreed to be acquired by CVX for $61.50 per share, a 37.6% premium to the Friday close of $43.81.

In Mesa, Arizona, a Starbucks café's workers voted to unionize, making it the third Starbucks location in the U.S. to do so. As a result, Starbucks' stock price slid 1% in premarket action.

The operator of the customer service platform ended its deal to purchase SurveyMonkey's parent company, Momentive, after Zendesk shareholders rejected the proposed transaction on Friday. This was due to objections from activist investor Jana Partners and skepticism about the deal's benefits from Wall Street analysts. Momentive's stock price fell 2.4% in premarket trading, while Zendesk's stock price rose 0.4%.

The defense stocks of Northrop Grumman, Raytheon Technologies, and General Dynamics surged in the premarket after Russia's invasion of Ukraine and the EU's pledge to increase defense spending.

Healthcare Trust and Healthcare Realty agreed to merge in a deal valued at $35.08 per share. Healthcare Trust's stock price dropped 5% in the premarket, while Healthcare Realty's stock price fell 9.2%.

Despite strong earnings and guidance, Bank of America Securities upgraded the home builders from "underperform" to "buy" at (PHM) and (TOL). The firm notes that home builders underperformed in 2022, but now feels the risk/reward profile is favorable. PulteGroup rose 1.1% in the premarket, while Toll Brothers added 1%.

The company renowned for TV ratings experienced a 7.6% increase in premarket stock prices following the release of adjusted quarterly earnings of 46 cents per share, which exceeded expectations by 10 cents, and the issuance of an optimistic full-year forecast. Additionally, the company unveiled a $1 billion share repurchase program.