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7. Stockholders' Equity
 12 Months Ended
Dec. 31, 2022
Stockholders' Equity Note [Abstract]  
Stockholders' Equity Note Disclosure [Text Block] .    STOCKHOLDERS' EQUITYBio-Rad’s issued and outstanding stock consists of Class A Common Stock (Class A) and Class B Common Stock (Class B). Each share of Class A and Class B common stock participates equally in the earnings and losses of Bio-Rad, and each share is identical to the next in all respects except as follows. Class A common stock has limited voting rights compared to Class B. Each share of Class A is entitled to one tenth of a vote on most matters, whereas each share of Class B is always entitled to one vote. Additionally, Class A stockholders are entitled to elect 25% of the directors, with Class B stockholders electing the remaining directors. Cash dividends may be paid on Class A shares without paying a cash dividend on Class B shares. In contrast, no cash dividend may be paid on Class B shares unless at least an equal cash dividend is paid on Class A shares. Class B shares are convertible at any time into Class A shares on a one-for-one basis at the option of the stockholder. The founders of Bio-Rad, the Schwartz family, collectively hold a majority of Bio-Rad’s voting stock. As a result, the Schwartz family is able to exercise control over Bio-Rad.
Changes to Bio-Rad's issued common stock shares are as follows (in thousands):
Class A SharesClass B Shares
Balance at January 1, 202024,966 5,090 
Class B to Class A conversions32 (32)
Issuance of common stock75 18 
Balance at December 31, 202025,073 5,076 
Class B to Class A conversions16 (16)
Issuance of common stock45 18 
Balance at December 31, 202125,134 5,078 
Class B to Class A conversions20 (20)
Issuance of common stock8 16 
Balance at December 31, 202225,162 5,074 

Treasury Shares

The share repurchase activity under the Share Repurchase Program through open market transactions for the years ended December 31, 2022, 2021 and 2020 are summarized as follows:
Number of Shares PurchasedWeighted-Average Price per ShareTotal Shares Repurchased To DateRemaining Authorized Value
(in millions)
March 1, 2020 - March 31, 2020291,941 $342.55 573,577 $73.1 
March 1, 2021 - March 31, 202189,506 $558.60 663,083 $223.1 
May 1, 2022 - May 31, 2022255,284 $489.65 918,367 $98.1 
November 1, 2022 - November 30, 2022241,408 $375.63 1,159,775 $207.4 

For the years ended December 31, 2022 and 2021, we used 135,744 and 114,711, respectively, of the repurchased shares in connection with the vesting of restricted stock units and our Employee Stock Purchase Program. As of December 31, 2022, $207.4 million remained available for repurchases under the Share Repurchase Program.