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Stockholders' Equity
 6 Months Ended
Jun. 30, 2026
Stockholders' Equity Note [Abstract]  
Stockholders' Equity Stockholders' Equity
Preferred Stock
As of June 30, 2026 and December 31, 2025, the Company had authorized 100,000,000 shares of preferred stock, par value $0.001 per share, of which no shares were issued and outstanding.
Common Stock
As of June 30, 2026 and December 31, 2025, the Company had authorized 1,000,000,000 shares of Class A common stock, par value $0.001 per share. As of June 30, 2026 and December 31, 2025, 153,571,872 and 152,411,346 shares of Class A common stock, respectively, were issued and outstanding.
The Company had reserved shares of common stock for issuance as follows:
As of June 30,As of December 31,
20262025
Stock options issued and outstanding767,453 902,120 
Unvested restricted stock units issued and outstanding12,168,065 13,663,977 
Shares of Class A common stock reserved for Twilio.org221,021 265,225 
Stock-based awards available for grant under 2016 equity plan10,529,415 28,543,969 
Shares of Class A common stock reserved for issuance pursuant to ESPP(1)
12,133,808 10,836,938 
Total35,819,762 54,212,229 
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(1) The amount as of June 30, 2026 reflects the number of shares of Class A common stock reserved for issuance pursuant to the ESPP governing the current offering period as of that date. See Note 12 for further details.

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.

In the three months ended June 30, 2026 and 2025, the Company repurchased 0.5 million and 1.8 million shares of its Class A common stock, respectively, for an aggregate purchase price of $66.0 million and $176.7 million, respectively. In the six months ended June 30, 2026 and 2025, the Company repurchased 2.6 million and 3.0 million shares of its Class A common stock, respectively, for an aggregate purchase price of $319.4 million and $306.9 million, respectively. As of June 30, 2026, approximately $826.0 million of the amount authorized in January 2025 for share repurchases remained available for future repurchases.