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Equity
 12 Months Ended
Dec. 31, 2025
Equity [Abstract]  
Equity Equity
The following table presents the equity capitalization of Avantor, Inc.:
(shares in millions)Par value per shareShares authorized
Undesignated preferred stock$0.01 75.0 
Common stock0.01 750.0 
Common stock
Each share of common stock entitles the holder to one vote for applicable matters. Holders are entitled to receive dividends declared by the board of directors and a pro rata share of assets available for distribution after satisfaction of the rights of the preferred stockholders.
Share purchase program
In October 2025, our Board of Directors authorized the repurchase of up to $500.0 million of our common stock, exclusive of fees, commissions and related transaction expenses. Repurchases may be funded through our available cash, borrowings under existing credit facilities or other financing arrangements approved by the Board of Directors.
Management is authorized to repurchase our common stock on the open market or in privately negotiated transactions, through one or more Rule 10b5-1 trading plans, Rule 10b-18 repurchase programs, accelerated share repurchase programs, including any collateral arrangements, or a combination thereof. The timing, manner, price and amount of repurchases will be determined by management depending upon economic, market and other conditions. The repurchase program may be modified, suspended, or terminated at any time. Shares repurchased under the program are held as treasury stock.
During the fourth quarter of 2025, we repurchased $75.0 million of our common stock (6.6 million shares). As of December 31, 2025, $425.0 million remained available for repurchase under the program.