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Stockholders' Equity
 3 Months Ended
Mar. 31, 2025
Stockholders' Equity Note [Abstract]  
Stockholders' Equity Stockholders' Equity
Preferred Stock
As of March 31, 2025, and December 31, 2024, the Company had authorized 100,000,000 shares of preferred stock, par value $0.001, of which no shares were issued and outstanding in either period.
Common Stock
As of March 31, 2025 and December 31, 2024, the Company had authorized 1,000,000,000 shares of Class A common stock and 3,170,181 shares of Class B common stock, each with a par value of $0.001 per share. As of March 31, 2025 and December 31, 2024, 153,254,342 and 152,610,697 shares of Class A common stock, respectively, and no shares of Class B common stock were issued and outstanding.
The Company had reserved shares of common stock for issuance as follows:
As of March 31,As of December 31,
20252024
Stock options issued and outstanding1,190,661 1,322,176 
Unvested restricted stock units issued and outstanding15,963,772 18,386,271 
Shares of Class A common stock reserved for Twilio.org331,531 353,633 
Stock-based awards available for grant under 2016 Plan31,234,619 23,292,678 
Shares of Class A common stock reserved for issuance pursuant to ESPP11,235,432 9,709,326 
Total59,956,015 53,064,084 

Share Repurchase Program
In January 2025, the board of directors of the Company authorized a share repurchase program to repurchase up to $2.0 billion in aggregate value of the Company’s outstanding Class A common stock. Repurchases under this program can be made through open market, private transactions or other means, in compliance with applicable federal securities laws, and can include repurchases pursuant to Rule 10b5-1 trading plans. The Company has discretion in determining the conditions under which shares may be repurchased from time to time. The program expires on December 31, 2027. The Company’s previous share repurchase authorizations expired on December 31, 2024.

In the three months ended March 31, 2025 and 2024, the Company repurchased 1.2 million and 6.1 million shares of its Class A common stock, respectively, for an aggregate purchase price of $130.2 million and $384.3 million, respectively. As of March 31, 2025, approximately $1.9 billion of the amount originally authorized for share repurchases in January 2025 remained available for future repurchases.