TWLO

SEC source: 0001447669-25-000088 · wk-form4_1749674135.xml · nonDerivative · entry 1

Bell Charles H · CIK 0001971759 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,712

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

F3 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001447669-25-000085 · wk-form4_1749069404.xml · nonDerivative · entry 1

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By Trust

Disclosed balance after: 33,488

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 2/27/2025.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $120.00 to $120.10 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 · ownership.nature: Shares are held by The Erika Rottenberg Revocable Trust.

SEC source: 0001447669-25-000083 · wk-form4_1747946472.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 164,084

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/7/2024.

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: 0001447669-25-000081 · wk-form4_1747688597.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 166,240

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.

F4 · balance_after: Includes 259 shares acquired by the Reporting Person pursuant to the Issuer's 2016 Employee Stock Purchase Plan on May 15, 2025.

SEC source: 0001447669-25-000081 · wk-form4_1747688597.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 165,982

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 $112.23 to $113.19 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: 0001447669-25-000079 · wk-form4_1747439203.xml · nonDerivative · entry 5

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 280,589

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/6/2024.

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: 0001447669-25-000079 · wk-form4_1747439203.xml · nonDerivative · entry 4

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 281,389

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/6/2024.

F6 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $93.40 to $94.085 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: 0001447669-25-000079 · wk-form4_1747439203.xml · nonDerivative · entry 3

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 283,400

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/6/2024.

F5 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $92.13 to $92.835 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: 0001447669-25-000079 · wk-form4_1747439203.xml · nonDerivative · entry 2

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 285,804

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/6/2024.

F4 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.13 to $92.06 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: 0001447669-25-000079 · wk-form4_1747439203.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 288,107

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/6/2024.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $90.07 to $91.06 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: 0001447669-25-000077 · wk-form4_1747439004.xml · nonDerivative · entry 5

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 167,905

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/7/2024.

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: 0001447669-25-000077 · wk-form4_1747439004.xml · nonDerivative · entry 4

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 168,405

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/7/2024.

F6 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $93.21 to $94.085 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: 0001447669-25-000077 · wk-form4_1747439004.xml · nonDerivative · entry 3

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 169,595

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/7/2024.

F5 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $92.145 to $92.80 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: 0001447669-25-000077 · wk-form4_1747439004.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 170,895

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/7/2024.

F4 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.125 to $92.06 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: 0001447669-25-000077 · wk-form4_1747439004.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 172,495

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/7/2024.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $90.09 to $91.00 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: 0001447669-25-000053 · wk-form4_1743628434.xml · nonDerivative · entry 3

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 295,134

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 $96.2950 to $96.9950 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: 0001447669-25-000053 · wk-form4_1743628434.xml · nonDerivative · entry 2

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 300,781

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 $95.2650 to $96.26 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 Issuer's Class A common stock.

SEC source: 0001447669-25-000053 · wk-form4_1743628434.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 303,452

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 $94.2650 to $95.2350 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: 0001447669-25-000055 · wk-form4_1743629027.xml · nonDerivative · entry 3

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 176,640

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 $96.4050 to $96.9950 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: 0001447669-25-000055 · wk-form4_1743629027.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 179,773

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 $95.39 to $96.38 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: 0001447669-25-000055 · wk-form4_1743629027.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 181,299

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 $94.38 to $95.33 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: 0001447669-25-000047 · wk-form4_1742332857.xml · nonDerivative · entry 1

PATRICK DEVAL L · CIK 0001053466 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,573

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: 0001104659-25-025181 · tm259613-1_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: 10,677

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 10,677 shares represent RSUs. Includes 632 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: 0001447669-25-000049 · wk-form4_1742333009.xml · nonDerivative · entry 3

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 37,588

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: 0001447669-25-000049 · wk-form4_1742333009.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: 0001447669-25-000049 · wk-form4_1742333009.xml · nonDerivative · entry 1

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 630

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: 0001447669-25-000051 · wk-form4_1742333171.xml · nonDerivative · entry 1

Suzuki Miyuki · CIK 0001867852 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,305

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

F3 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001447669-25-000043 · wk-form4_1742332465.xml · nonDerivative · entry 1

Epstein Jeff · CIK 0001228718 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,486

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: 0001447669-25-000045 · wk-form4_1742332676.xml · nonDerivative · entry 1

IMMELT JEFFREY R · CIK 0001233164 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,237

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: 0001447669-25-000041 · wk-form4_1742332272.xml · nonDerivative · entry 3

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Shustek-Dubinsky Family Trust

Disclosed balance after: 23,279

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: 0001447669-25-000041 · wk-form4_1742332272.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: 0001447669-25-000041 · wk-form4_1742332272.xml · nonDerivative · entry 1

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 618

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: 0001447669-25-000039 · wk-form4_1742332097.xml · nonDerivative · entry 1

Bell Charles H · CIK 0001971759 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,006

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

F3 · balance_after: Includes RSUs that have been deferred by the Reporting Person.

SEC source: 0001447669-25-000027 · wk-form4_1740521346.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 184,164

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/7/2024.

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: 0001447669-25-000019 · wk-form4_1740098999.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 307,190

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, 2025, 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 Issuer's Class A common stock.

SEC source: 0001447669-25-000020 · wk-form4_1740099274.xml · nonDerivative · entry 4

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 186,664

F6 · shares: The shares reported in this transaction represent 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, 2025, 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.

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: 0001447669-25-000020 · wk-form4_1740099274.xml · nonDerivative · entry 3

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 152,519

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 $125.60 to $126.51 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: 0001447669-25-000020 · wk-form4_1740099274.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 152,834

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 $124.50 to $125.005 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: 0001447669-25-000020 · wk-form4_1740099274.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 152,984

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 $123.50 to $124.43 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: 0001447669-25-000008 · wk-form4_1736379437.xml · nonDerivative · entry 2

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 244,971

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/6/2024.

F4 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $113.5850 to $114.3350 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: 0001447669-25-000008 · wk-form4_1736379437.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 250,798

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/6/2024.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $112.59 to $113.5750 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: 0001447669-25-000010 · wk-form4_1736379640.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 153,910

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/7/2024.

F4 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $113.5850 to $114.21 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: 0001447669-25-000010 · wk-form4_1736379640.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 157,088

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/7/2024.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $112.59 to $113.58 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: 0001447669-25-000002 · wk-form4_1735940515.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 255,805

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 $106.72 to $107.70 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: 0001447669-25-000006 · wk-form4_1735941103.xml · nonDerivative · entry 2

Wagner Dana · CIK 0001658462 · Chief Legal Officer, Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,590

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: This total reflects the effect of the subsequent forfeiture of RSUs in connection with the Reporting Person's resignation, which was effective on January 1, 2025.

SEC source: 0001447669-25-000006 · wk-form4_1735941103.xml · nonDerivative · entry 1

Wagner Dana · CIK 0001658462 · Chief Legal Officer, Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,690

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 $106.7250 to $107.70 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: This total reflects the effect of the subsequent forfeiture of RSUs in connection with the Reporting Person's resignation, which was effective on January 1, 2025.

SEC source: 0001447669-25-000004 · wk-form4_1735940890.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 160,462

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 $106.8550 to $107.74 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: 0001447669-24-000204 · wk-form4_1734472779.xml · nonDerivative · entry 1

PATRICK DEVAL L · CIK 0001053466 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,955

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: 0001104659-24-129431 · tm2431195-1_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: 10,045

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 10,045 shares represent RSUs.

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: 0001447669-24-000208 · wk-form4_1734473020.xml · nonDerivative · entry 2

Suzuki Miyuki · CIK 0001867852 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,679

F3 · shares: Represents shares of Class A common stock that were withheld by the Issuer to satisfy tax withholding obligations of the Reporting Person in connection with the vesting of RSUs.

F2 · 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.