TWLO

SEC source: 0001965469-25-000009 · wk-form4_1763590688.xml · nonDerivative · entry 3

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 128,104

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: 0001965469-25-000009 · wk-form4_1763590688.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 128,174

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 $123.245 to $124.035 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: 0001965469-25-000009 · wk-form4_1763590688.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 128,914

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 $122.08 to $122.965 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: 0001759316-25-000005 · wk-form4_1763414766.xml · nonDerivative · entry 1

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Shustek-Dubinsky Family Trust

Disclosed balance after: 20,670

F1 · kind: On November 13, 2025, the Reporting Person donated 4,063 shares to a donor-advised fund, which will use the gifted shares for charitable purposes.

F2 · balance_after: Includes Restricted Stock Units ("RSUs") that have been deferred by the Reporting Person.

F3 · ownership.nature: Leonard Shustek & Donna Dubinsky, Trustees, Shustek-Dubinsky Family Trust Dated 8/1/04.

SEC source: 0001965469-25-000007 · wk-form4_1760477108.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 129,618

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: 0001737610-25-000005 · wk-form4_1759875325.xml · nonDerivative · entry 2

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 220,383

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 $103.83 to $104.74 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 Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of Issuer's Class A common stock.

SEC source: 0001737610-25-000005 · wk-form4_1759875325.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 229,843

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 $102.80 to $103.79 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: 0001447669-25-000133 · wk-form4_1759442037.xml · nonDerivative · entry 3

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 233,305

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 $100.73 to $101.70 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: 0001447669-25-000133 · wk-form4_1759442037.xml · nonDerivative · entry 2

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 239,852

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 $99.73 to $100.71 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: 0001447669-25-000133 · wk-form4_1759442037.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 245,225

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 $98.62 to $99.59 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: 0001447669-25-000132 · wk-form4_1759441998.xml · nonDerivative · entry 3

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 137,653

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 $100.74 to $101.72 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: 0001447669-25-000132 · wk-form4_1759441998.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 141,670

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 $99.73 to $100.71 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: 0001447669-25-000132 · wk-form4_1759441998.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 144,964

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 $98.59 to $99.57 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: 0001447669-25-000129 · wk-form4_1758141319.xml · nonDerivative · entry 1

PATRICK DEVAL L · CIK 0001053466 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,027

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: 0001104659-25-090882 · tm2526268-1_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: 12,163

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 12,163 shares represent RSUs. Includes 2,118 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: 0001447669-25-000131 · wk-form4_1758141383.xml · nonDerivative · entry 1

Suzuki Miyuki · CIK 0001867852 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,116

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: 0001447669-25-000130 · wk-form4_1758141348.xml · nonDerivative · entry 3

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 34,970

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: 0001447669-25-000130 · wk-form4_1758141348.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: 0001447669-25-000130 · wk-form4_1758141348.xml · nonDerivative · entry 1

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 778

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: 0001447669-25-000127 · wk-form4_1758141221.xml · nonDerivative · entry 1

Epstein Jeff · CIK 0001228718 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,526

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 vested immediately on the date of grant.

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

SEC source: 0001447669-25-000126 · wk-form4_1758141010.xml · nonDerivative · entry 3

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Shustek-Dubinsky Family Trust

Disclosed balance after: 24,733

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: 0001447669-25-000126 · wk-form4_1758141010.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: 0001447669-25-000126 · wk-form4_1758141010.xml · nonDerivative · entry 1

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 763

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: 0001447669-25-000128 · wk-form4_1758141284.xml · nonDerivative · entry 1

IMMELT JEFFREY R · CIK 0001233164 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,756

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: 0001447669-25-000125 · wk-form4_1758140851.xml · nonDerivative · entry 1

Bell Charles H · CIK 0001971759 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,492

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: 0001965469-25-000004 · wk-form4_1755637221.xml · nonDerivative · entry 3

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 146,016

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 $107.02 to $107.12 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: 0001965469-25-000004 · wk-form4_1755637221.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 146,222

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 $105.78 to $106.75 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: 0001965469-25-000004 · wk-form4_1755637221.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 147,322

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 $104.4850 to $105.45 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: 0001447669-25-000107 · wk-form4_1752007058.xml · nonDerivative · entry 3

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 246,986

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

F5 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $118.30 to $118.43 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 Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of Issuer's Class A common stock.

SEC source: 0001447669-25-000107 · wk-form4_1752007058.xml · nonDerivative · entry 2

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 247,020

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 $117.2727 to $118.27 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: 0001447669-25-000107 · wk-form4_1752007058.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 251,588

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 $116.24 to $117.22 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: 0001447669-25-000109 · wk-form4_1752007211.xml · nonDerivative · entry 3

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 147,823

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: 0001447669-25-000109 · wk-form4_1752007211.xml · nonDerivative · entry 2

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 147,876

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 $117.35 to $118.26 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 Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of Issuer's Class A common stock.

SEC source: 0001447669-25-000109 · wk-form4_1752007211.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 150,515

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 $116.24 to $117.225 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: 0001447669-25-000103 · wk-form4_1751494110.xml · nonDerivative · entry 3

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 260,581

F4 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 2/24/2025.

F6 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $124.67 to $125.34 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: 0001447669-25-000103 · wk-form4_1751494110.xml · nonDerivative · entry 2

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 264,406

F4 · kind: The sales reported were executed under the Reporting Person's 10b5-1 trading plan, dated as of 2/24/2025.

F5 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $123.66 to $124.65 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: 0001447669-25-000103 · wk-form4_1751494110.xml · nonDerivative · entry 1

Shipchandler Khozema · CIK 0001737610 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 267,581

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 $124.23 to $124.87 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: 0001447669-25-000105 · wk-form4_1751494352.xml · nonDerivative · entry 1

Viggiano Aidan · CIK 0001965469 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 156,120

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 $124.2001 to $124.76 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: 0001447669-25-000101 · wk-form4_1750109944.xml · nonDerivative · entry 1

Suzuki Miyuki · CIK 0001867852 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,343

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.

SEC source: 0001447669-25-000095 · wk-form4_1749674758.xml · nonDerivative · entry 1

PATRICK DEVAL L · CIK 0001053466 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,264

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: 0001104659-25-058588 · tm2517580-1_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: 11,383

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 11,383 shares represent RSUs. Includes 1,338 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: 0001447669-25-000099 · wk-form4_1749675093.xml · nonDerivative · entry 1

Suzuki Miyuki · CIK 0001867852 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,004

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: 0001447669-25-000097 · wk-form4_1749674982.xml · nonDerivative · entry 3

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 34,192

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: 0001447669-25-000097 · wk-form4_1749674982.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: 0001447669-25-000097 · wk-form4_1749674982.xml · nonDerivative · entry 1

ROTTENBERG ERIKA · CIK 0001284038 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 704

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: 0001447669-25-000093 · wk-form4_1749674629.xml · nonDerivative · entry 1

IMMELT JEFFREY R · CIK 0001233164 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,959

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: 0001447669-25-000091 · wk-form4_1749674470.xml · nonDerivative · entry 1

Epstein Jeff · CIK 0001228718 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,449

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: 0001447669-25-000090 · wk-form4_1749674264.xml · nonDerivative · entry 3

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Shustek-Dubinsky Family Trust

Disclosed balance after: 23,970

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: 0001447669-25-000090 · wk-form4_1749674264.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: 0001447669-25-000090 · wk-form4_1749674264.xml · nonDerivative · entry 1

Dubinsky Donna · CIK 0001759316 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 691

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.