Net Income (Loss) Per Share
The numerators and denominators of the basic and diluted net income (loss) per share computations for the Company's common stock are calculated as follows (in thousands, except per share data):
Year ended December 31,
202520242023
Common Stock (1)
Class A
Class B
Class A
Class B
Numerator:
Net loss attributable to common stockholders$(66,141)$(72,565)$(7,135)$(62,086)$(13,175)
Denominator:
Weighted-average number of shares of common stock - basic and diluted170,584150,09214,758131,95128,002
Net loss per share attributable to common stockholders:
Basic and diluted$(0.39)$(0.48)$(0.48)$(0.47)$(0.47)
(1) During the fourth quarter of 2024, the number of outstanding shares of the Company's Class B common stock declined such that the total number of outstanding shares of Class B common stock represented less than 5% of the aggregate number of outstanding shares of the Company's Class A common stock and Class B common stock. Under the terms of the Company's amended and restated certificate of incorporation, the Company's Class B common stock automatically converted to Class A common stock effective as of December 31, 2024. This resulted in 3,550,142 shares of Class A common stock being issued on December 31, 2024 with the related shares of Class B common stock being cancelled. Following the approval by the Company's shareholders of certain amendments to the Company's Certificate of Incorporation at the 2025 Annual Shareholder Meeting, the Company filed with the State of Delaware the Eleventh Amended and Restated Certificate of Incorporation of ACV Auctions Inc. The changes include, among other things, the removal of all references to Class B Common Stock and the reclassification of Class A Common Stock to Common Stock.
The following table presents the total weighted-average number of potentially dilutive shares that were excluded from the computation of diluted net income (loss) per share attributable to common stockholders because their effect would have been anti-dilutive for the period presented:
Year ended December 31,
202520242023
Unvested RSUs and other awards1,8363,5212,170
Stock options1,8664,3175,409

About Earnings Per Share Disclosures

The earnings per share disclosure breaks down the calculation from net income to both basic and diluted EPS, revealing the full impact of a company's capital structure on per-share economics. The reconciliation between basic and diluted share counts exposes how many stock options, RSUs, convertible securities, and warrants are potentially dilutive to existing shareholders.

Key signals: a widening gap between basic and diluted shares indicates growing dilution from equity compensation or convertible instruments. Anti-dilutive securities excluded from the diluted calculation deserve attention — they represent latent dilution that will materialize if the stock price rises. Watch for the effect of share buybacks on per-share metrics: EPS growth driven primarily by repurchases rather than income growth signals weakening fundamentals. Compare year-over-year changes in the diluted share count against equity compensation expense to assess whether management is effectively managing dilution.