TWLO

SEC source: 0001447669-26-000035 · wk-form4_1775680031.xml · nonDerivative · entry 2

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 243,142

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 2/24/2025.

F4 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $132.52 to $133.50 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001447669-26-000035 · wk-form4_1775680031.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 248,457

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 2/24/2025.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $131.49 to $132.44 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001447669-26-000033 · wk-form4_1775507375.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 130,341

F1 · kind: The sale reported was executed under the Reporting Person's 10b5-1 trading plan, dated as of 6/6/2025.

F4 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $127.50 to $128.11 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001447669-26-000033 · wk-form4_1775507375.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 135,388

F1 · kind: The sale reported was executed under the Reporting Person's 10b5-1 trading plan, dated as of 6/6/2025.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $126.50 to $127.44 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001447669-26-000029 · wk-form4_1775160595.xml · nonDerivative · entry 4

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 251,257

F1 · shares: Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell-to-cover" transaction and does not represent a discretionary sale by the Reporting Person.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001447669-26-000029 · wk-form4_1775160595.xml · nonDerivative · entry 3

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 251,357

F1 · shares: Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell-to-cover" transaction and does not represent a discretionary sale by the Reporting Person.

F5 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $123.635 to $124.26 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001447669-26-000029 · wk-form4_1775160595.xml · nonDerivative · entry 2

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 253,207

F1 · shares: Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell-to-cover" transaction and does not represent a discretionary sale by the Reporting Person.

F4 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $122.60 to $123.49 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001447669-26-000029 · wk-form4_1775160595.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 257,988

F1 · shares: Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell-to-cover" transaction and does not represent a discretionary sale by the Reporting Person.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $121.595 to $122.585 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001447669-26-000031 · wk-form4_1775160689.xml · nonDerivative · entry 4

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 139,730

F1 · shares: Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell-to-cover" transaction and does not represent a discretionary sale by the Reporting Person.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001447669-26-000031 · wk-form4_1775160689.xml · nonDerivative · entry 3

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 139,830

F1 · shares: Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell-to-cover" transaction and does not represent a discretionary sale by the Reporting Person.

F5 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $124.00 to $124.40 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001447669-26-000031 · wk-form4_1775160689.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 140,331

F1 · shares: Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell-to-cover" transaction and does not represent a discretionary sale by the Reporting Person.

F4 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $122.905 to $123.84 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001447669-26-000031 · wk-form4_1775160689.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 142,269

F1 · shares: Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell-to-cover" transaction and does not represent a discretionary sale by the Reporting Person.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $121.905 to $122.875 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001897137-26-000007 · wk-form4_1774557509.xml · nonDerivative · entry 1

Robinson Douglas A. · CIK 0001897137 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,526

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs shall vest as follows: 9.8% of the RSUs will vest on June 10, 2026, the one year anniversary of our last annual meeting of stockholders (the "Initial Vesting Date"), 45.1% of the RSUs will vest on the one year anniversary of the Initial Vesting Date and 45.1% of the RSUs will vest on the two year anniversary of the Initial Vesting Date, subject, in each case, to continued service as a director of the Issuer through each such vesting date.

F2 · balance_after: These shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001053466-26-000002 · wk-form4_1773780394.xml · nonDerivative · entry 1

PATRICK DEVAL L · CIK 0001053466 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,327

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001104659-26-029586 · tm269074-1_4seq1.xml · nonDerivative · entry 1

Stafman Andrew · CIK 0002018024 · Director

Ferguson Scott D. · CIK 0001658919 · See Footnotes

Sachem Head Capital Management LP · CIK 0001582090 · See Footnotes

Uncas GP LLC · CIK 0001658906 · See Footnotes

Sachem Head GP LLC · CIK 0001658917 · See Footnotes

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,492

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs") granted by Twilio Inc. (the "Issuer") to Andrew J. Stafman. Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Of these shares, all 13,492 shares represent RSUs. Includes 3,447 RSUs that have been deferred by the Reporting Person.

F3 · ownership.direct: In addition to Andrew J. Stafman, this Form 4 is being filed jointly by Sachem Head Capital Management LP ("Sachem Head"), Uncas GP LLC ("SH Management"), Sachem Head GP LLC ("Sachem Head GP"), and Scott D. Ferguson, a citizen of the United States (Mr. Ferguson and, together with Sachem Head, SH Management, Sachem GP, and Mr. Stafman, the "Reporting Persons"). Each of the Reporting Persons has the same business address as Mr. Stafman and may be deemed to be the beneficial owner of certain of the securities reported on this Form 4 (the "Subject Securities") for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended. Each of the Reporting Persons disclaims any beneficial ownership of any of the Subject Securities, except to the extent of any pecuniary interest therein.

F4 · ownership.direct: Andrew J. Stafman is a partner at Sachem Head and also serves on the board of directors of the Issuer. As a result, the Reporting Persons other than Mr. Stafman may be deemed directors of the Issuer by deputization.

F5 · ownership.direct: Pursuant to an arrangement between Andrew J. Stafman and Sachem Head, upon receipt of the Subject Securities, Andrew J. Stafman granted all right, title, interest, claims, and any other ownership interests in such Subject Securities to Sachem Head for no consideration.

SEC source: 0001867852-26-000002 · wk-form4_1773780615.xml · nonDerivative · entry 1

Suzuki Miyuki · CIK 0001867852 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,433

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001284038-26-000002 · wk-form4_1773780469.xml · nonDerivative · entry 3

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 36,295

F4 · kind: Represents the shares received by the Reporting Person's trust.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

F5 · ownership.nature: Shares are held by The Erika Rottenberg Revocable Trust.

SEC source: 0001284038-26-000002 · wk-form4_1773780469.xml · nonDerivative · entry 2

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F3 · kind: Represents shares that were contributed by the Reporting Person to the Reporting Person's trust.

SEC source: 0001284038-26-000002 · wk-form4_1773780469.xml · nonDerivative · entry 1

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 686

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001228718-26-000002 · wk-form4_1773780247.xml · nonDerivative · entry 1

Epstein Jeff · CIK 0001228718 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,362

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001233164-26-000002 · wk-form4_1773780316.xml · nonDerivative · entry 1

IMMELT JEFFREY R · CIK 0001233164 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,114

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

SEC source: 0001759316-26-000002 · wk-form4_1773780144.xml · nonDerivative · entry 3

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Shustek-Dubinsky Family Trust

Disclosed balance after: 21,970

F4 · kind: Represents the shares received by the Reporting Person's trust.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

F5 · ownership.nature: Leonard Shustek & Donna Dubinsky, Trustees, Shustek-Dubinsky Family Trust Dated 8/1/04.

SEC source: 0001759316-26-000002 · wk-form4_1773780144.xml · nonDerivative · entry 2

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F3 · kind: Represents shares that were contributed by the Reporting Person to the Reporting Person's trust.

SEC source: 0001759316-26-000002 · wk-form4_1773780144.xml · nonDerivative · entry 1

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 673

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001971759-26-000002 · wk-form4_1773780068.xml · nonDerivative · entry 1

Bell Charles H · CIK 0001971759 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,821

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001965469-26-000008 · wk-form4_1772660706.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 147,961

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 6/6/2025.

F2 · balance_after: A portion of these shares represent Restricted Stock Units (" RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001737610-26-000008 · wk-form4_1771972709.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 263,881

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vest as follows: 1/12 of the RSUs vest on March 31, 2026, and 1/12th of the RSUs vest each quarter thereafter on June 30, September 30, December 31 and March 31 for the next 11 quarters, subject to the Reporting Person's continued service to the Issuer through each vesting date.

F2 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001965469-26-000006 · wk-form4_1771972812.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 148,767

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vest as follows: 1/12 of the RSUs vest on March 31, 2026, and 1/12th of the RSUs vest each quarter thereafter on June 30, September 30, December 31 and March 31 for the next 11 quarters, subject to the Reporting Person's continued service to the Issuer through each vesting date.

F2 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Class A common stock.

SEC source: 0001965469-26-000004 · wk-form4_1771537260.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,213

F1 · shares: Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell-to-cover" transaction and does not represent a discretionary sale by the Reporting Person.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of Issuer's Class A common stock.

SEC source: 0001965469-26-000004 · wk-form4_1771537260.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,413

F1 · shares: Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell-to-cover" transaction and does not represent a discretionary sale by the Reporting Person.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $110.00 to $110.95 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of Issuer's Class A common stock.

SEC source: 0001737610-26-000004 · wk-form4_1767911192.xml · nonDerivative · entry 3

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 193,781

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 2/24/2025.

F3 · balance_after: A portion of these shares represent Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of Issuer's Class A common stock.

SEC source: 0001737610-26-000004 · wk-form4_1767911192.xml · nonDerivative · entry 2

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 193,813

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 2/24/2025.

F4 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $133.86 to $134.85 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of Issuer's Class A common stock.

SEC source: 0001737610-26-000004 · wk-form4_1767911192.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 204,936

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 2/24/2025.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $132.82 to $133.60 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of Issuer's Class A common stock.

SEC source: 0001447669-26-000002 · wk-form4_1767822211.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 112,236

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 6/6/2025.

F2 · balance_after: A portion of these shares represent Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of Issuer's Class A common stock.

SEC source: 0001737610-26-000002 · wk-form4_1767648215.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 207,117

F1 · shares: Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell-to-cover" transaction and does not represent a discretionary sale by the Reporting Person.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $142.74 to $143.73 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of Issuer's Class A common stock.

SEC source: 0001965469-26-000002 · wk-form4_1767648647.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 119,449

F1 · shares: Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell-to-cover" transaction and does not represent a discretionary sale by the Reporting Person.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $142.82 to $143.73 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3 · balance_after: A portion of these shares represent RSUs. Each RSU represents a contingent right to receive one share of Issuer's Class A common stock.

SEC source: 0001053466-25-000005 · wk-form4_1766007823.xml · nonDerivative · entry 1

PATRICK DEVAL L · CIK 0001053466 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,654

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001104659-25-122101 · tm2533638-1_4seq1.xml · nonDerivative · entry 1

Stafman Andrew · CIK 0002018024 · Director

Ferguson Scott D. · CIK 0001658919 · See Footnotes

Sachem Head Capital Management LP · CIK 0001582090 · See Footnotes

Uncas GP LLC · CIK 0001658906 · See Footnotes

Sachem Head GP LLC · CIK 0001658917 · See Footnotes

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,804

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs") granted by Twilio Inc. (the "Issuer") to Andrew J. Stafman. Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Of these shares, all 12,804 shares represent RSUs. Includes 2,759 RSUs that have been deferred by the Reporting Person.

F3 · ownership.direct: In addition to Andrew J. Stafman, this Form 4 is being filed jointly by Sachem Head Capital Management LP ("Sachem Head"), Uncas GP LLC ("SH Management"), Sachem Head GP LLC ("Sachem Head GP"), and Scott D. Ferguson, a citizen of the United States (Mr. Ferguson and, together with Sachem Head, SH Management, Sachem GP, and Mr. Stafman, the "Reporting Persons"). Each of the Reporting Persons has the same business address as Mr. Stafman and may be deemed to be the beneficial owner of certain of the securities reported on this Form 4 (the "Subject Securities") for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended. Each of the Reporting Persons disclaims any beneficial ownership of any of the Subject Securities, except to the extent of any pecuniary interest therein.

F4 · ownership.direct: Andrew J. Stafman is a partner at Sachem Head and also serves on the board of directors of the Issuer. As a result, the Reporting Persons other than Mr. Stafman may be deemed directors of the Issuer by deputization.

F5 · ownership.direct: Pursuant to an arrangement between Andrew J. Stafman and Sachem Head, upon receipt of the Subject Securities, Andrew J. Stafman granted all right, title, interest, claims, and any other ownership interests in such Subject Securities to Sachem Head for no consideration.

SEC source: 0001867852-25-000005 · wk-form4_1766007933.xml · nonDerivative · entry 1

Suzuki Miyuki · CIK 0001867852 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,751

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001284038-25-000005 · wk-form4_1766007882.xml · nonDerivative · entry 3

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 35,609

F3 · kind: Represents the shares received by the Reporting Person's trust.

F4 · ownership.nature: Shares are held by The Erika Rottenberg Revocable Trust.

SEC source: 0001284038-25-000005 · wk-form4_1766007882.xml · nonDerivative · entry 2

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F2 · kind: Represents shares that were contributed by the Reporting Person to the Reporting Person's trust.

SEC source: 0001284038-25-000005 · wk-form4_1766007882.xml · nonDerivative · entry 1

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 639

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

SEC source: 0001228718-25-000008 · wk-form4_1766007443.xml · nonDerivative · entry 1

Epstein Jeff · CIK 0001228718 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,411

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001233164-25-000005 · wk-form4_1766007755.xml · nonDerivative · entry 1

IMMELT JEFFREY R · CIK 0001233164 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,411

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

SEC source: 0001759316-25-000007 · wk-form4_1766007272.xml · nonDerivative · entry 3

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Shustek-Dubinsky Family Trust

Disclosed balance after: 21,297

F4 · kind: Represents the shares received by the Reporting Person's trust.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

F5 · ownership.nature: Leonard Shustek & Donna Dubinsky, Trustees, Shustek-Dubinsky Family Trust Dated 8/1/04.

SEC source: 0001759316-25-000007 · wk-form4_1766007272.xml · nonDerivative · entry 2

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F3 · kind: Represents shares that were contributed by the Reporting Person to the Reporting Person's trust.

SEC source: 0001759316-25-000007 · wk-form4_1766007272.xml · nonDerivative · entry 1

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 627

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001971759-25-000005 · wk-form4_1766007213.xml · nonDerivative · entry 1

Bell Charles H · CIK 0001971759 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,133

F1 · shares: The shares reported in this transaction represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The RSUs vested immediately on the date of grant.

F2 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001104659-25-117847 · tm2532612-1_4seq1.xml · nonDerivative · entry 1

Stafman Andrew · CIK 0002018024 · Director

Ferguson Scott D. · CIK 0001658919 · See Footnotes

Sachem Head Capital Management LP · CIK 0001582090 · See Footnotes

Uncas GP LLC · CIK 0001658906 · See Footnotes

Sachem Head GP LLC · CIK 0001658917 · See Footnotes

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 2,295,000

F1 · ownership.nature: In addition to Andrew J. Stafman, this Form 4 is being filed jointly by Sachem Head Capital Management LP ("Sachem Head"), Uncas GP LLC ("SH Management"), Sachem Head GP LLC ("Sachem Head GP"), and Scott D. Ferguson, a citizen of the United States (Mr. Ferguson and, together with Sachem Head, SH Management, Sachem GP, and Mr. Stafman, the "Reporting Persons"). Each of the Reporting Persons has the same business address as Mr. Stafman and may be deemed to be the beneficial owner of certain of the securities reported on this Form 4 (the "Subject Securities") for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended. Each of the Reporting Persons disclaims any beneficial ownership of any of the Subject Securities, except to the extent of any pecuniary interest therein.

F2 · ownership.nature: Includes securities directly owned by Sachem Head LP ("SH"), Sachem Head Master LP ("SHM"), and SH Stony Creek Master Ltd. ("Stony Creek Master" and, together with SH and SHM, the "Sachem Head Funds"). Each of Sachem Head, as the investment adviser to the Sachem Head Funds, SH Management, as the sole general partner of Sachem Head, and Scott D. Ferguson, as the managing partner of Sachem Head, may be deemed to beneficially own the securities directly owned by the Sachem Head Funds. As the general partner of SH and SHM, Sachem Head GP may be deemed to beneficially own the securities directly owned by SH and SHM.

F3 · ownership.nature: The principal business of Sachem Head is to serve as investment advisor to certain affiliated funds, including the Sachem Head Funds. The principal business of SH Management is to serve as the sole general partner of Sachem Head. The principal business of Sachem Head GP is to serve as the general partner of certain affiliated funds, including SH and SHM. The principal occupation of Scott D. Ferguson is to serve as the managing partner of Sachem Head and the managing member of SH Management and Sachem Head GP.

F4 · ownership.nature: Andrew J. Stafman is a partner at Sachem Head and also serves on the board of directors of the Issuer. As a result, the Reporting Persons other than Mr. Stafman may be deemed directors of the Issuer by deputization.

SEC source: 0001965469-25-000011 · wk-form4_1763759440.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 127,558

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 6/6/2025.

F2 · balance_after: A portion of these shares represent Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of Issuer's Class A common stock.