TWLO

SEC source: 0001447669-24-000104 · wk-form4_1720042124.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 300,084

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 $56.12 to $56.4501 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: 0001447669-24-000108 · wk-form4_1720042500.xml · nonDerivative · entry 1

Wagner Dana · CIK 0001658462 · Chief Legal Officer, Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 160,137

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 $56.07 to $56.46 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: 0001447669-24-000106 · wk-form4_1720042327.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 195,048

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 $56.07 to $56.49 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 Issuer's Class A common stock.

SEC source: 0001447669-24-000102 · wk-form4_1718399804.xml · nonDerivative · entry 1

Suzuki Miyuki · CIK 0001867852 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,132

F1 · 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 Restricted Stock Units ("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.

SEC source: 0001447669-24-000100 · wk-form4_1718224502.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 201,845

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 $57.62 to $57.90 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: 0001447669-24-000100 · wk-form4_1718224502.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 208,511

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 $56.62 to $57.61 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.

F4 · balance_after: Includes 257 shares inadvertently omitted from the Reporting Person's Form 3.

SEC source: 0001447669-24-000098 · wk-form4_1718145056.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 311,325

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

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: 0001447669-24-000092 · wk-form4_1717793279.xml · nonDerivative · entry 1

PATRICK DEVAL L · CIK 0001053466 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,983

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: 0001104659-24-069749 · tm2416754-1_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: 8,046

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 8,046 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: 0000950170-24-071041 · ownership.xml · nonDerivative · entry 1

Deeter Byron B · CIK 0001506450 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,073

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 reported vested immediately on the date of grant.

F2 · shares: The Reporting Person has agreed to assign to Deer Management Co. LLC the right to any shares issuable pursuant to this grant or any proceeds from the sale thereof.

F1 · price: 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 reported vested immediately on the date of grant.

F2 · ownership.direct: The Reporting Person has agreed to assign to Deer Management Co. LLC the right to any shares issuable pursuant to this grant or any proceeds from the sale thereof.

SEC source: 0001447669-24-000096 · wk-form4_1717793932.xml · nonDerivative · entry 2

Suzuki Miyuki · CIK 0001867852 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,628

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.

SEC source: 0001447669-24-000096 · wk-form4_1717793932.xml · nonDerivative · entry 1

Suzuki Miyuki · CIK 0001867852 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,911

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.

SEC source: 0001447669-24-000094 · wk-form4_1717793415.xml · nonDerivative · entry 3

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 34,929

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: 0001447669-24-000094 · wk-form4_1717793415.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: 0001447669-24-000094 · wk-form4_1717793415.xml · nonDerivative · entry 1

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,317

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: 0001447669-24-000090 · wk-form4_1717793133.xml · nonDerivative · entry 1

IMMELT JEFFREY R · CIK 0001233164 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,528

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: 0001447669-24-000088 · wk-form4_1717792705.xml · nonDerivative · entry 1

Epstein Jeff · CIK 0001228718 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,994

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: 0001447669-24-000086 · wk-form4_1717792538.xml · nonDerivative · entry 3

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Shustek-Dubinsky Family Trust

Disclosed balance after: 20,689

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: 0001447669-24-000086 · wk-form4_1717792538.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: 0001447669-24-000086 · wk-form4_1717792538.xml · nonDerivative · entry 1

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,245

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: 0001447669-24-000084 · wk-form4_1717792251.xml · nonDerivative · entry 1

Bell Charles H · CIK 0001971759 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,357

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: 0001447669-24-000082 · wk-form4_1716326131.xml · nonDerivative · entry 1

Wagner Dana · CIK 0001658462 · Chief Legal Officer, Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 164,374

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 6/5/2023.

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: 0001447669-24-000080 · wk-form4_1716325853.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 228,506

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/10/2023.

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: 0001447669-24-000078 · wk-form4_1715979655.xml · nonDerivative · entry 2

Wagner Dana · CIK 0001658462 · Chief Legal Officer, Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 165,170

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 purchased in multiple transactions at prices ranging from $62.45 to $62.83 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 purchased 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.

F5 · balance_after: Includes 406 shares acquired by the Reporting Person pursuant to the Issuer's 2016 Employee Stock Purchase Plan on May 15, 2024.

SEC source: 0001447669-24-000078 · wk-form4_1715979655.xml · nonDerivative · entry 1

Wagner Dana · CIK 0001658462 · Chief Legal Officer, Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 164,976

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 purchased in multiple transactions at prices ranging from $61.37 to $61.97 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 purchased 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: 0001447669-24-000076 · wk-form4_1715979458.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 229,462

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.

F4 · price: The reported price in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $62.43 to $62.70 per share, inclusive. The Reporting Person 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 purchased 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.

F5 · balance_after: Includes 406 shares acquired by the Reporting Person pursuant to the Issuer's 2016 Employee Stock Purchase Plan on May 15, 2024.

SEC source: 0001447669-24-000076 · wk-form4_1715979458.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 229,228

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 purchased in multiple transactions at prices ranging from $61.35 to $62.16 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 purchased 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: 0001447669-24-000060 · wk-form4_1712613782.xml · nonDerivative · entry 2

Wagner Dana · CIK 0001658462 · Chief Legal Officer, Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 166,773

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 6/5/2023.

F4 · price: The reported price in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $61.81 to $62.075 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 purchased 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: 0001447669-24-000060 · wk-form4_1712613782.xml · nonDerivative · entry 1

Wagner Dana · CIK 0001658462 · Chief Legal Officer, Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 167,050

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 6/5/2023.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $60.79 to $61.60 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 purchased 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: 0001447669-24-000058 · wk-form4_1712613277.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 231,036

F1 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/10/2023.

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: 0001447669-24-000052 · wk-form4_1712184281.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 335,982

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 purchased in multiple transactions at prices ranging from $61.87 to $62.37 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 purchased 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: 0001447669-24-000056 · wk-form4_1712184547.xml · nonDerivative · entry 1

Wagner Dana · CIK 0001658462 · Chief Legal Officer, Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 167,614

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 purchased in multiple transactions at prices ranging from $61.905 to $62.38 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 purchased 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: 0001447669-24-000054 · wk-form4_1712184421.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 234,411

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 $61.88 to $62.35 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: 0001104659-24-042773 · tm2410719-2_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: 7,039

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 shall vest as follows: 9.4% of the RSUs will vest on June 13, 2024, the one year anniversary of our last annual meeting of stockholders (the "Initial Vesting Date"), 45.3% of the RSUs will vest on the one year anniversary of the Initial Vesting Date, and 45.3% 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: Of these shares, all 7,039 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: 0001447669-24-000046 · wk-form4_1710883661.xml · nonDerivative · entry 1

PATRICK DEVAL L · CIK 0001053466 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,749

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: 0001447669-24-000050 · wk-form4_1710885209.xml · nonDerivative · entry 2

Suzuki Miyuki · CIK 0001867852 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,656

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.

SEC source: 0001447669-24-000050 · wk-form4_1710885209.xml · nonDerivative · entry 1

Suzuki Miyuki · CIK 0001867852 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,934

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.

SEC source: 0001447669-24-000048 · wk-form4_1710883900.xml · nonDerivative · entry 3

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 33,612

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: 0001447669-24-000048 · wk-form4_1710883900.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: 0001447669-24-000048 · wk-form4_1710883900.xml · nonDerivative · entry 1

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,296

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: 0001447669-24-000042 · wk-form4_1710883157.xml · nonDerivative · entry 1

Epstein Jeff · CIK 0001228718 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,363

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: 0001447669-24-000044 · wk-form4_1710883386.xml · nonDerivative · entry 1

IMMELT JEFFREY R · CIK 0001233164 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,231

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: 0001447669-24-000040 · wk-form4_1710882934.xml · nonDerivative · entry 3

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Shustek-Dubinsky Family Trust

Disclosed balance after: 19,444

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: 0001447669-24-000040 · wk-form4_1710882934.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: 0001447669-24-000040 · wk-form4_1710882934.xml · nonDerivative · entry 1

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,248

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: 0001447669-24-000038 · wk-form4_1710882698.xml · nonDerivative · entry 1

Bell Charles H · CIK 0001971759 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,101

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: 0000950170-24-033498 · ownership.xml · nonDerivative · entry 1

Deeter Byron B · CIK 0001506450 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,853

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 reported vested immediately on the date of grant.

F2 · shares: The Reporting Person has agreed to assign to Deer Management Co. LLC the right to any shares issuable pursuant to this grant or any proceeds from the sale thereof.

F1 · price: 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 reported vested immediately on the date of grant.

F2 · ownership.direct: The Reporting Person has agreed to assign to Deer Management Co. LLC the right to any shares issuable pursuant to this grant or any proceeds from the sale thereof.

SEC source: 0001447669-24-000030 · wk-form4_1708732503.xml · nonDerivative · entry 1

Wagner Dana · CIK 0001658462 · Chief Legal Officer, Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 171,744

F1 · kind: The sale reported was executed under the Reporting Person's 10b5-1 trading plan, dated as of 6/5/2023.

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: 0001447669-24-000028 · wk-form4_1708732325.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 241,044

F1 · kind: The sale reported was executed under the Reporting Person's 10b5-1 trading plan, dated as of 3/10/2023.

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: 0001447669-24-000025 · wk-form4_1708645995.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 346,943

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: 1/16 of the RSUs vest on March 31, 2024, and 1/16th of the RSUs vest each quarter thereafter on June 30, September 30, December 31 and March 31 for the next 15 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.