TTAN

SEC source: 0001638826-25-000019 · form4.xml · nonDerivative · entry 4

Kuzoyan Vahe · CIK 0001908757 · Director · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 937.25

F2 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on April 15, 2025.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $108.56 to $109.55. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000019 · form4.xml · nonDerivative · entry 3

Kuzoyan Vahe · CIK 0001908757 · Director · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,348.25

F2 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on April 15, 2025.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $107.56 to $108.55. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000019 · form4.xml · nonDerivative · entry 2

Kuzoyan Vahe · CIK 0001908757 · Director · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 11,794.25

F2 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on April 15, 2025.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $106.56 to $107.55. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000019 · form4.xml · nonDerivative · entry 1

Kuzoyan Vahe · CIK 0001908757 · Director · President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 16,504.25

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Represents the conversion of Class B Common Stock into Class A Common Stock held of record by the Reporting Person.

SEC source: 0001193125-25-213687 · ownership.xml · nonDerivative · entry 1

Deeter Byron B · CIK 0001506450 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · shares: On September 19, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 12,518 shares, 15,055 shares and 672 shares of Class A Common Stock of the Issuer, respectively.

F1 · price: On September 19, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 12,518 shares, 15,055 shares and 672 shares of Class A Common Stock of the Issuer, respectively.

F2 · ownership.nature: The Reporting Person is a partner at Bessemer Venture Partners and has an indirect, passive economic interest in the shares held by the Bessemer Funds by virtue of his interest in (1) Deer VIII & Co. L.P., the general partner of the Bessemer Funds and (2) certain other indirect limited partnership interests in certain of the Bessemer Funds. The Reporting Person disclaims beneficial ownership of the securities held by the Bessemer Funds, except to the extent of his pecuniary interest, if any, in such securities by virtue of his indirect interest in the Bessemer Funds. This report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities.

SEC source: 0001193125-25-213684 · ownership.xml · nonDerivative · entry 3

Bessemer Venture Partners VIII L.P. · CIK 0001508900 · 10% owner

Bessemer Venture Partners VIII Institutional L.P. · CIK 0001508902 · 10% owner

15 Angels II LLC · CIK 0001713257 · 10% owner

Deer VIII & Co. Ltd. · CIK 0001559311 · 10% owner

Deer VIII & Co. L.P. · CIK 0001559306 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 7,131,050

F1 · shares: On September 19, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 12,518 shares, 15,055 shares and 672 shares of Class A Common Stock of the Issuer, respectively.

F5 · price: These shares were sold at a weighted average price of $119.44. These shares were sold in multiple transactions at prices ranging from $119.09 to $119.51. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F6 · balance_after: After the sales, BVP VIII, BVP VIII Inst, 15 Angels and Cloud All Star Fund, L.P. ("CASF"), own 3,128,739 shares, 3,830,146 shares, 171,926 shares and 189,399 shares of Class A Common Stock, respectively.

F3 · ownership.nature: Certain affiliates of the Bessemer Funds own a material interest in Cloud All Star Fund GP, LLC, the general partner of CASF, which has voting and dispositive power with respect to the shares held by CASF. 15 Angels is a subsidiary of BVP VIII Inst. Deer VIII & Co. L.P. ("Deer VIII L.P.") is the general partner of BVP VIII and BVP Inst VIII. Deer VIII & Co. Ltd. ("Deer VIII Ltd.") is the general partner of Deer VIII L.P. Byron Deeter, David Cowan, Jeremy Levine, Robert P. Goodman, Scott Ring, Sandra Grippo and Robert M. Stavis are the directors of Deer VIII Ltd. and hold voting and dispositive power for the Bessemer Funds. Investment and voting decisions with respect to the securities held by the Bessemer Funds are made by the directors of Deer VIII Ltd. acting as an investment committee.

SEC source: 0001193125-25-213684 · ownership.xml · nonDerivative · entry 2

Bessemer Venture Partners VIII L.P. · CIK 0001508900 · 10% owner

Bessemer Venture Partners VIII Institutional L.P. · CIK 0001508902 · 10% owner

15 Angels II LLC · CIK 0001713257 · 10% owner

Deer VIII & Co. Ltd. · CIK 0001559311 · 10% owner

Deer VIII & Co. L.P. · CIK 0001559306 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 7,138,717

F1 · shares: On September 19, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 12,518 shares, 15,055 shares and 672 shares of Class A Common Stock of the Issuer, respectively.

F4 · price: These shares were sold at a weighted average price of $118.69. These shares were sold in multiple transactions at prices ranging from $118.10 to $119.07. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F3 · ownership.nature: Certain affiliates of the Bessemer Funds own a material interest in Cloud All Star Fund GP, LLC, the general partner of CASF, which has voting and dispositive power with respect to the shares held by CASF. 15 Angels is a subsidiary of BVP VIII Inst. Deer VIII & Co. L.P. ("Deer VIII L.P.") is the general partner of BVP VIII and BVP Inst VIII. Deer VIII & Co. Ltd. ("Deer VIII Ltd.") is the general partner of Deer VIII L.P. Byron Deeter, David Cowan, Jeremy Levine, Robert P. Goodman, Scott Ring, Sandra Grippo and Robert M. Stavis are the directors of Deer VIII Ltd. and hold voting and dispositive power for the Bessemer Funds. Investment and voting decisions with respect to the securities held by the Bessemer Funds are made by the directors of Deer VIII Ltd. acting as an investment committee.

SEC source: 0001193125-25-213684 · ownership.xml · nonDerivative · entry 1

Bessemer Venture Partners VIII L.P. · CIK 0001508900 · 10% owner

Bessemer Venture Partners VIII Institutional L.P. · CIK 0001508902 · 10% owner

15 Angels II LLC · CIK 0001713257 · 10% owner

Deer VIII & Co. Ltd. · CIK 0001559311 · 10% owner

Deer VIII & Co. L.P. · CIK 0001559306 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 17,145,378

F1 · shares: On September 19, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 12,518 shares, 15,055 shares and 672 shares of Class A Common Stock of the Issuer, respectively.

F2 · price: These shares were sold at a weighted average price of $117.31. These shares were sold in multiple transactions at prices ranging from $117.00 to $117.74. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F3 · ownership.nature: Certain affiliates of the Bessemer Funds own a material interest in Cloud All Star Fund GP, LLC, the general partner of CASF, which has voting and dispositive power with respect to the shares held by CASF. 15 Angels is a subsidiary of BVP VIII Inst. Deer VIII & Co. L.P. ("Deer VIII L.P.") is the general partner of BVP VIII and BVP Inst VIII. Deer VIII & Co. Ltd. ("Deer VIII Ltd.") is the general partner of Deer VIII L.P. Byron Deeter, David Cowan, Jeremy Levine, Robert P. Goodman, Scott Ring, Sandra Grippo and Robert M. Stavis are the directors of Deer VIII Ltd. and hold voting and dispositive power for the Bessemer Funds. Investment and voting decisions with respect to the securities held by the Bessemer Funds are made by the directors of Deer VIII Ltd. acting as an investment committee.

SEC source: 0001638826-25-000013 · form4.xml · nonDerivative · entry 4

Sherry David · CIK 0002045642 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 347,927.75

F1 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $116.64 to $117.51. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000013 · form4.xml · nonDerivative · entry 3

Sherry David · CIK 0002045642 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 350,893.75

F1 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $115.64 to $116.63. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000013 · form4.xml · nonDerivative · entry 2

Sherry David · CIK 0002045642 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 355,864.5

F1 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $114.64 to $115.63. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000013 · form4.xml · nonDerivative · entry 1

Sherry David · CIK 0002045642 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 358,575

F1 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $113.64 to $114.63. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001193125-25-207614 · ownership.xml · nonDerivative · entry 2

Bessemer Venture Partners VIII L.P. · CIK 0001508900 · 10% owner

Bessemer Venture Partners VIII Institutional L.P. · CIK 0001508902 · 10% owner

15 Angels II LLC · CIK 0001713257 · 10% owner

Deer VIII & Co. Ltd. · CIK 0001559311 · 10% owner

Deer VIII & Co. L.P. · CIK 0001559306 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 7,159,295

F4 · shares: On September 17, 2025, BVP VIII, BVP VIII Inst and 15 Angels sold 3,120 shares, 3,751 shares and 168 shares of Class A Common Stock of the Issuer, respectively.

F5 · price: These shares were sold at a weighted average price of $117.32. These shares were sold in multiple transactions at prices ranging from $117.01 to $117.97. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F6 · balance_after: After the sales, BVP VIII, BVP VIII Inst, 15 Angels and Cloud All Star Fund, L.P. ("CASF"), own 3,141,257 shares, 3,845,201 shares, 172,598 shares and 189,399 shares of Class A Common Stock, respectively.

F3 · ownership.nature: Certain affiliates of the Bessemer Funds own a material interest in Cloud All Star Fund GP, LLC, the general partner of CASF, which has voting and dispositive power with respect to the shares held by CASF. 15 Angels is a subsidiary of BVP VIII Inst. Deer VIII & Co. L.P. ("Deer VIII L.P.") is the general partner of BVP VIII and BVP Inst VIII. Deer VIII & Co. Ltd. ("Deer VIII Ltd.") is the general partner of Deer VIII L.P. Byron Deeter, David Cowan, Jeremy Levine, Robert P. Goodman, Scott Ring, Sandra Grippo and Robert M. Stavis are the directors of Deer VIII Ltd. and hold voting and dispositive power for the Bessemer Funds. Investment and voting decisions with respect to the securities held by the Bessemer Funds are made by the directors of Deer VIII Ltd. acting as an investment committee.

SEC source: 0001193125-25-207613 · ownership.xml · nonDerivative · entry 2

Deeter Byron B · CIK 0001506450 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

F3 · shares: On September 17, 2025, BVP VIII, BVP VIII Inst and 15 Angels sold 3,120 shares, 3,751 shares and 168 shares of Class A Common Stock of the Issuer, respectively.

F3 · price: On September 17, 2025, BVP VIII, BVP VIII Inst and 15 Angels sold 3,120 shares, 3,751 shares and 168 shares of Class A Common Stock of the Issuer, respectively.

F2 · ownership.nature: The Reporting Person is a partner at Bessemer Venture Partners and has an indirect, passive economic interest in the shares held by the Bessemer Funds by virtue of his interest in (1) Deer VIII & Co. L.P., the general partner of the Bessemer Funds and (2) certain other indirect limited partnership interests in certain of the Bessemer Funds. The Reporting Person disclaims beneficial ownership of the securities held by the Bessemer Funds, except to the extent of his pecuniary interest, if any, in such securities by virtue of his indirect interest in the Bessemer Funds. This report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities.

SEC source: 0001638826-25-000017 · form4.xml · derivative · entry 6

Kuzoyan Vahe · CIK 0001908757 · Director · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,555,490

Underlying: Class A Common Stock · 3,059 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F7 · derivative.exercise_price: The Class B common stock is convertible into an equal number of shares of Class A common stock at any time, at the holder's election. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon any transfer, whether or not for value, except for certain permitted transfers, or upon the occurrence of certain specified events, in each case as set forth in the Issuer's Amended and Restated Certificate of Incorporation.

F1 · kind: Represents the conversion of Class B Common Stock into Class A Common Stock held of record by the Reporting Person.

F7 · derivative.exercise_date: The Class B common stock is convertible into an equal number of shares of Class A common stock at any time, at the holder's election. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon any transfer, whether or not for value, except for certain permitted transfers, or upon the occurrence of certain specified events, in each case as set forth in the Issuer's Amended and Restated Certificate of Incorporation.

F7 · derivative.expiration_date: The Class B common stock is convertible into an equal number of shares of Class A common stock at any time, at the holder's election. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon any transfer, whether or not for value, except for certain permitted transfers, or upon the occurrence of certain specified events, in each case as set forth in the Issuer's Amended and Restated Certificate of Incorporation.

SEC source: 0001638826-25-000017 · form4.xml · nonDerivative · entry 5

Kuzoyan Vahe · CIK 0001908757 · Director · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0.25

F2 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $116.64 to $117.51. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000017 · form4.xml · nonDerivative · entry 4

Kuzoyan Vahe · CIK 0001908757 · Director · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 772.5

F2 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $115.64 to $116.63. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000017 · form4.xml · nonDerivative · entry 3

Kuzoyan Vahe · CIK 0001908757 · Director · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,067

F2 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $114.64 to $115.63. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000017 · form4.xml · nonDerivative · entry 2

Kuzoyan Vahe · CIK 0001908757 · Director · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,772.75

F2 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $113.64 to $114.63. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000017 · form4.xml · nonDerivative · entry 1

Kuzoyan Vahe · CIK 0001908757 · Director · President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,059

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Represents the conversion of Class B Common Stock into Class A Common Stock held of record by the Reporting Person.

SEC source: 0001638826-25-000015 · form4.xml · derivative · entry 6

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,286,683

Underlying: Class A Common Stock · 3,058 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F7 · derivative.exercise_price: The Class B Common Stock is convertible into an equal number of shares of Class A Common Stock at any time, at the holder's election. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon any transfer, whether or not for value, except for certain permitted transfers, or upon the occurrence of certain specified events, in each case as set forth in the Issuer's Amended and Restated Certificate of Incorporation.

F1 · kind: Represents the conversion of Class B Common Stock into Class A Common Stock held of record by the Reporting Person.

F7 · derivative.exercise_date: The Class B Common Stock is convertible into an equal number of shares of Class A Common Stock at any time, at the holder's election. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon any transfer, whether or not for value, except for certain permitted transfers, or upon the occurrence of certain specified events, in each case as set forth in the Issuer's Amended and Restated Certificate of Incorporation.

F7 · derivative.expiration_date: The Class B Common Stock is convertible into an equal number of shares of Class A Common Stock at any time, at the holder's election. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon any transfer, whether or not for value, except for certain permitted transfers, or upon the occurrence of certain specified events, in each case as set forth in the Issuer's Amended and Restated Certificate of Incorporation.

SEC source: 0001638826-25-000015 · form4.xml · nonDerivative · entry 5

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F2 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $116.64 to $117.51. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000015 · form4.xml · nonDerivative · entry 4

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 772.25

F2 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $115.64 to $116.63. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000015 · form4.xml · nonDerivative · entry 3

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,066.75

F2 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $114.64 to $115.63. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000015 · form4.xml · nonDerivative · entry 2

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,772.5

F2 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $113.64 to $114.63. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000015 · form4.xml · nonDerivative · entry 1

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,058.75

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Represents the conversion of Class B Common Stock into Class A Common Stock held of record by the Reporting Person.

SEC source: 0001638826-25-000011 · form4.xml · nonDerivative · entry 5

O'Connor Michele · CIK 0001771322 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 93,748.5

F1 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $116.64 to $117.51. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000011 · form4.xml · nonDerivative · entry 4

O'Connor Michele · CIK 0001771322 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 94,174.5

F1 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $115.64 to $116.63. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000011 · form4.xml · nonDerivative · entry 3

O'Connor Michele · CIK 0001771322 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 94,888.5

F1 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $114.64 to $115.63. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000011 · form4.xml · nonDerivative · entry 2

O'Connor Michele · CIK 0001771322 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 95,278.5

F1 · kind: Represents shares sold to satisfy the Reporting Person's tax withholding obligation in connection with the vesting of restricted stock units. These sales are mandated as part of the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $113.64 to $114.63. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or 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.

SEC source: 0001638826-25-000011 · form4.xml · nonDerivative · entry 1

O'Connor Michele · CIK 0001771322 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 95,436.5

SEC source: 0001193125-25-207614 · ownership.xml · nonDerivative · entry 1

Bessemer Venture Partners VIII L.P. · CIK 0001508900 · 10% owner

Bessemer Venture Partners VIII Institutional L.P. · CIK 0001508902 · 10% owner

15 Angels II LLC · CIK 0001713257 · 10% owner

Deer VIII & Co. Ltd. · CIK 0001559311 · 10% owner

Deer VIII & Co. L.P. · CIK 0001559306 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 7,166,334

F1 · shares: On September 16, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 25,564 shares, 30,748 shares and 1,376 shares of Class A Common Stock of the Issuer, respectively.

F2 · price: These shares were sold at a weighted average price of $117.18. These shares were sold in multiple transactions at prices ranging from $117.00 to $117.45. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F3 · ownership.nature: Certain affiliates of the Bessemer Funds own a material interest in Cloud All Star Fund GP, LLC, the general partner of CASF, which has voting and dispositive power with respect to the shares held by CASF. 15 Angels is a subsidiary of BVP VIII Inst. Deer VIII & Co. L.P. ("Deer VIII L.P.") is the general partner of BVP VIII and BVP Inst VIII. Deer VIII & Co. Ltd. ("Deer VIII Ltd.") is the general partner of Deer VIII L.P. Byron Deeter, David Cowan, Jeremy Levine, Robert P. Goodman, Scott Ring, Sandra Grippo and Robert M. Stavis are the directors of Deer VIII Ltd. and hold voting and dispositive power for the Bessemer Funds. Investment and voting decisions with respect to the securities held by the Bessemer Funds are made by the directors of Deer VIII Ltd. acting as an investment committee.

SEC source: 0001193125-25-207613 · ownership.xml · nonDerivative · entry 1

Deeter Byron B · CIK 0001506450 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · shares: On September 16, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 25,564 shares, 30,748 shares and 1,376 shares of Class A Common Stock of the Issuer, respectively.

F1 · price: On September 16, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 25,564 shares, 30,748 shares and 1,376 shares of Class A Common Stock of the Issuer, respectively.

F2 · ownership.nature: The Reporting Person is a partner at Bessemer Venture Partners and has an indirect, passive economic interest in the shares held by the Bessemer Funds by virtue of his interest in (1) Deer VIII & Co. L.P., the general partner of the Bessemer Funds and (2) certain other indirect limited partnership interests in certain of the Bessemer Funds. The Reporting Person disclaims beneficial ownership of the securities held by the Bessemer Funds, except to the extent of his pecuniary interest, if any, in such securities by virtue of his indirect interest in the Bessemer Funds. This report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities.

SEC source: 0001193125-25-205250 · ownership.xml · nonDerivative · entry 1

Deeter Byron B · CIK 0001506450 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · shares: On September 12, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 4,208 shares, 5,061 shares and 226 shares of Class A Common Stock of the Issuer, respectively.

F1 · price: On September 12, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 4,208 shares, 5,061 shares and 226 shares of Class A Common Stock of the Issuer, respectively.

F2 · ownership.nature: The Reporting Person is a partner at Bessemer Venture Partners and has an indirect, passive economic interest in the shares held by the Bessemer Funds by virtue of his interest in (1) Deer VIII & Co. L.P., the general partner of the Bessemer Funds and (2) certain other indirect limited partnership interests in certain of the Bessemer Funds. The Reporting Person disclaims beneficial ownership of the securities held by the Bessemer Funds, except to the extent of his pecuniary interest, if any, in such securities by virtue of his indirect interest in the Bessemer Funds. This report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities.

SEC source: 0001193125-25-205249 · ownership.xml · nonDerivative · entry 1

Bessemer Venture Partners VIII L.P. · CIK 0001508900 · 10% owner

Bessemer Venture Partners VIII Institutional L.P. · CIK 0001508902 · 10% owner

15 Angels II LLC · CIK 0001713257 · 10% owner

Deer VIII & Co. Ltd. · CIK 0001559311 · 10% owner

Deer VIII & Co. L.P. · CIK 0001559306 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 7,224,022

F1 · shares: On September 12, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 4,208 shares, 5,061 shares and 226 shares of Class A Common Stock of the Issuer, respectively.

F2 · price: These shares were sold at a weighted average price of $117.13. These shares were sold in multiple transactions at prices ranging from $117.00 to $117.90. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F3 · balance_after: After the sales, BVP VIII, BVP VIII Inst, 15 Angels and Cloud All Star Fund, L.P. ("CASF"), own 3,169,941 shares, 3,879,700 shares, 174,142 shares and 189,399 shares of Class A Common Stock, respectively.

F4 · ownership.nature: Certain affiliates of the Bessemer Funds own a material interest in Cloud All Star Fund GP, LLC, the general partner of CASF, which has voting and dispositive power with respect to the shares held by CASF. 15 Angels is a subsidiary of BVP VIII Inst. Deer VIII & Co. L.P. ("Deer VIII L.P.") is the general partner of BVP VIII and BVP Inst VIII. Deer VIII & Co. Ltd. ("Deer VIII Ltd.") is the general partner of Deer VIII L.P. Byron Deeter, David Cowan, Jeremy Levine, Robert P. Goodman, Scott Ring, Sandra Grippo and Robert M. Stavis are the directors of Deer VIII Ltd. and hold voting and dispositive power for the Bessemer Funds. Investment and voting decisions with respect to the securities held by the Bessemer Funds are made by the directors of Deer VIII Ltd. acting as an investment committee.

SEC source: 0000950170-25-114680 · ownership.xml · nonDerivative · entry 5

Bessemer Venture Partners VIII L.P. · CIK 0001508900 · 10% owner

Bessemer Venture Partners VIII Institutional L.P. · CIK 0001508902 · 10% owner

15 Angels II LLC · CIK 0001713257 · 10% owner

Cloud All Star Fund, LP · CIK 0001828220 · 10% owner

Deer VIII & Co. Ltd. · CIK 0001559311 · 10% owner

Deer VIII & Co. L.P. · CIK 0001559306 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 7,233,517

F7 · shares: On September 11, 2025, BVP VIII, BVP VIII Inst and 15 Angels II sold 3,124 shares, 3,757 shares and 167 shares of Class A Common Stock of the Issuer, respectively.

F8 · price: These shares were sold at a weighted average price of $117.098. These shares were sold in multiple transactions at prices ranging from $117.00 to $117.283. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F9 · balance_after: After the sales, BVP VIII, BVP VIII Inst, 15 Angels and Cloud All Star Fund, L.P. ("CASF"), own 3,174,149 shares, 3,884,761 shares, 174,368 shares and 189,399 shares of Class A Common Stock, respectively.

F3 · ownership.nature: Certain affiliates of the Bessemer Funds own a material interest in Cloud All Star Fund GP, LLC, the general partner of CASF, which has voting and dispositive power with respect to the shares held by CASF. 15 Angels is a subsidiary of BVP VIII Inst. Deer VIII & Co. L.P. ("Deer VIII L.P.") is the general partner of BVP VIII and BVP Inst VIII. Deer VIII & Co. Ltd. ("Deer VIII Ltd.") is the general partner of Deer VIII L.P. Byron Deeter, David Cowan, Jeremy Levine, Robert P. Goodman, Scott Ring, Sandra Grippo and Robert M. Stavis are the directors of Deer VIII Ltd. and hold voting and dispositive power for the Bessemer Funds. Investment and voting decisions with respect to the securities held by the Bessemer Funds are made by the directors of Deer VIII Ltd. acting as an investment committee.

SEC source: 0000950170-25-114676 · ownership.xml · nonDerivative · entry 2

Deeter Byron B · CIK 0001506450 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

F2 · shares: On September 11, 2025, BVP VIII, BVP VIII Inst and 15 Angels II sold 3,124 shares, 3,757 shares and 167 shares of Class A Common Stock of the Issuer, respectively.

F2 · price: On September 11, 2025, BVP VIII, BVP VIII Inst and 15 Angels II sold 3,124 shares, 3,757 shares and 167 shares of Class A Common Stock of the Issuer, respectively.

F3 · ownership.nature: The Reporting Person is a partner at Bessemer Venture Partners and has an indirect, passive economic interest in the shares held by the Bessemer Funds by virtue of his interest in (1) Deer VIII & Co. L.P., the general partner of the Bessemer Funds and (2) certain other indirect limited partnership interests in certain of the Bessemer Funds. The Reporting Person disclaims beneficial ownership of the securities held by the Bessemer Funds, except to the extent of his pecuniary interest, if any, in such securities by virtue of his indirect interest in the Bessemer Funds. This report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities.

SEC source: 0001638826-25-000009 · form4.xml · derivative · entry 13

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Indirect · By the AMKE Trust dated February 1, 2019

Disclosed balance after: 4,683,017

Underlying: Class A Common Stock · 42,666 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F11 · derivative.exercise_price: The Class B Common Stock is convertible into an equal number of shares of Class A Common Stock at any time, at the holder's election. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon any transfer, whether or not for value, except for certain permitted transfers, or upon the occurrence of certain specified events, in each case as set forth in the Issuer's Amended and Restated Certificate of Incorporation.

F1 · kind: Represents the conversion of Class B Common Stock into Class A Common Stock held of record by the Reporting Person.

F11 · derivative.exercise_date: The Class B Common Stock is convertible into an equal number of shares of Class A Common Stock at any time, at the holder's election. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon any transfer, whether or not for value, except for certain permitted transfers, or upon the occurrence of certain specified events, in each case as set forth in the Issuer's Amended and Restated Certificate of Incorporation.

F11 · derivative.expiration_date: The Class B Common Stock is convertible into an equal number of shares of Class A Common Stock at any time, at the holder's election. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon any transfer, whether or not for value, except for certain permitted transfers, or upon the occurrence of certain specified events, in each case as set forth in the Issuer's Amended and Restated Certificate of Incorporation.

SEC source: 0001638826-25-000009 · form4.xml · nonDerivative · entry 10

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Indirect · By the AMKE Trust dated February 1, 2019

Disclosed balance after: 0

F2 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on April 15, 2025.

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $118.39 to $118.76. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price with the range set forth in this footnote.

SEC source: 0001638826-25-000009 · form4.xml · nonDerivative · entry 9

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Indirect · By the AMKE Trust dated February 1, 2019

Disclosed balance after: 788

F2 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on April 15, 2025.

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $117.39 to $118.38. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price with the range set forth in this footnote.

SEC source: 0001638826-25-000009 · form4.xml · nonDerivative · entry 8

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Indirect · By the AMKE Trust dated February 1, 2019

Disclosed balance after: 3,501

F2 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on April 15, 2025.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $116.39 to $117.38. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price with the range set forth in this footnote.

SEC source: 0001638826-25-000009 · form4.xml · nonDerivative · entry 7

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Indirect · By the AMKE Trust dated February 1, 2019

Disclosed balance after: 10,164

F2 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on April 15, 2025.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $115.39 to $116.38. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price with the range set forth in this footnote.

SEC source: 0001638826-25-000009 · form4.xml · nonDerivative · entry 6

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Indirect · By the AMKE Trust dated February 1, 2019

Disclosed balance after: 32,295

F2 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on April 15, 2025.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $114.39 to $115.38. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price with the range set forth in this footnote.

SEC source: 0001638826-25-000009 · form4.xml · nonDerivative · entry 5

Mahdessian Ara · CIK 0001908788 · Director · Chief Executive Officer

10b5-1 filing: Plan reported

Ownership: Indirect · By the AMKE Trust dated February 1, 2019

Disclosed balance after: 42,666

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Represents the conversion of Class B Common Stock into Class A Common Stock held of record by the Reporting Person.

SEC source: 0000950170-25-114680 · ownership.xml · nonDerivative · entry 4

Bessemer Venture Partners VIII L.P. · CIK 0001508900 · 10% owner

Bessemer Venture Partners VIII Institutional L.P. · CIK 0001508902 · 10% owner

15 Angels II LLC · CIK 0001713257 · 10% owner

Cloud All Star Fund, LP · CIK 0001828220 · 10% owner

Deer VIII & Co. Ltd. · CIK 0001559311 · 10% owner

Deer VIII & Co. L.P. · CIK 0001559306 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 7,240,565

F1 · shares: On September 10, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 6,461 shares, 7,771 shares and 347 shares of Class A Common Stock of the Issuer, respectively.

F6 · price: These shares were sold at a weighted average price of $118.735. These shares were sold in multiple transactions at prices ranging from $118.60 to $119.00. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F3 · ownership.nature: Certain affiliates of the Bessemer Funds own a material interest in Cloud All Star Fund GP, LLC, the general partner of CASF, which has voting and dispositive power with respect to the shares held by CASF. 15 Angels is a subsidiary of BVP VIII Inst. Deer VIII & Co. L.P. ("Deer VIII L.P.") is the general partner of BVP VIII and BVP Inst VIII. Deer VIII & Co. Ltd. ("Deer VIII Ltd.") is the general partner of Deer VIII L.P. Byron Deeter, David Cowan, Jeremy Levine, Robert P. Goodman, Scott Ring, Sandra Grippo and Robert M. Stavis are the directors of Deer VIII Ltd. and hold voting and dispositive power for the Bessemer Funds. Investment and voting decisions with respect to the securities held by the Bessemer Funds are made by the directors of Deer VIII Ltd. acting as an investment committee.

SEC source: 0000950170-25-114680 · ownership.xml · nonDerivative · entry 3

Bessemer Venture Partners VIII L.P. · CIK 0001508900 · 10% owner

Bessemer Venture Partners VIII Institutional L.P. · CIK 0001508902 · 10% owner

15 Angels II LLC · CIK 0001713257 · 10% owner

Cloud All Star Fund, LP · CIK 0001828220 · 10% owner

Deer VIII & Co. Ltd. · CIK 0001559311 · 10% owner

Deer VIII & Co. L.P. · CIK 0001559306 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 7,242,332

F1 · shares: On September 10, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 6,461 shares, 7,771 shares and 347 shares of Class A Common Stock of the Issuer, respectively.

F5 · price: These shares were sold at a weighted average price of $118.151. These shares were sold in multiple transactions at prices ranging from $117.685 to $118.59. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F3 · ownership.nature: Certain affiliates of the Bessemer Funds own a material interest in Cloud All Star Fund GP, LLC, the general partner of CASF, which has voting and dispositive power with respect to the shares held by CASF. 15 Angels is a subsidiary of BVP VIII Inst. Deer VIII & Co. L.P. ("Deer VIII L.P.") is the general partner of BVP VIII and BVP Inst VIII. Deer VIII & Co. Ltd. ("Deer VIII Ltd.") is the general partner of Deer VIII L.P. Byron Deeter, David Cowan, Jeremy Levine, Robert P. Goodman, Scott Ring, Sandra Grippo and Robert M. Stavis are the directors of Deer VIII Ltd. and hold voting and dispositive power for the Bessemer Funds. Investment and voting decisions with respect to the securities held by the Bessemer Funds are made by the directors of Deer VIII Ltd. acting as an investment committee.

SEC source: 0000950170-25-114680 · ownership.xml · nonDerivative · entry 2

Bessemer Venture Partners VIII L.P. · CIK 0001508900 · 10% owner

Bessemer Venture Partners VIII Institutional L.P. · CIK 0001508902 · 10% owner

15 Angels II LLC · CIK 0001713257 · 10% owner

Cloud All Star Fund, LP · CIK 0001828220 · 10% owner

Deer VIII & Co. Ltd. · CIK 0001559311 · 10% owner

Deer VIII & Co. L.P. · CIK 0001559306 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 7,249,581

F1 · shares: On September 10, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 6,461 shares, 7,771 shares and 347 shares of Class A Common Stock of the Issuer, respectively.

F4 · price: These shares were sold at a weighted average price of $117,135. These shares were sold in multiple transactions at prices ranging from $116.669 to $117.654. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F3 · ownership.nature: Certain affiliates of the Bessemer Funds own a material interest in Cloud All Star Fund GP, LLC, the general partner of CASF, which has voting and dispositive power with respect to the shares held by CASF. 15 Angels is a subsidiary of BVP VIII Inst. Deer VIII & Co. L.P. ("Deer VIII L.P.") is the general partner of BVP VIII and BVP Inst VIII. Deer VIII & Co. Ltd. ("Deer VIII Ltd.") is the general partner of Deer VIII L.P. Byron Deeter, David Cowan, Jeremy Levine, Robert P. Goodman, Scott Ring, Sandra Grippo and Robert M. Stavis are the directors of Deer VIII Ltd. and hold voting and dispositive power for the Bessemer Funds. Investment and voting decisions with respect to the securities held by the Bessemer Funds are made by the directors of Deer VIII Ltd. acting as an investment committee.

SEC source: 0000950170-25-114680 · ownership.xml · nonDerivative · entry 1

Bessemer Venture Partners VIII L.P. · CIK 0001508900 · 10% owner

Bessemer Venture Partners VIII Institutional L.P. · CIK 0001508902 · 10% owner

15 Angels II LLC · CIK 0001713257 · 10% owner

Cloud All Star Fund, LP · CIK 0001828220 · 10% owner

Deer VIII & Co. Ltd. · CIK 0001559311 · 10% owner

Deer VIII & Co. L.P. · CIK 0001559306 · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 7,250,953

F1 · shares: On September 10, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 6,461 shares, 7,771 shares and 347 shares of Class A Common Stock of the Issuer, respectively.

F2 · price: These shares were sold at a weighted average price of $116.079. These shares were sold in multiple transactions at prices ranging from $115.65 to $116.641. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F3 · ownership.nature: Certain affiliates of the Bessemer Funds own a material interest in Cloud All Star Fund GP, LLC, the general partner of CASF, which has voting and dispositive power with respect to the shares held by CASF. 15 Angels is a subsidiary of BVP VIII Inst. Deer VIII & Co. L.P. ("Deer VIII L.P.") is the general partner of BVP VIII and BVP Inst VIII. Deer VIII & Co. Ltd. ("Deer VIII Ltd.") is the general partner of Deer VIII L.P. Byron Deeter, David Cowan, Jeremy Levine, Robert P. Goodman, Scott Ring, Sandra Grippo and Robert M. Stavis are the directors of Deer VIII Ltd. and hold voting and dispositive power for the Bessemer Funds. Investment and voting decisions with respect to the securities held by the Bessemer Funds are made by the directors of Deer VIII Ltd. acting as an investment committee.

SEC source: 0000950170-25-114676 · ownership.xml · nonDerivative · entry 1

Deeter Byron B · CIK 0001506450 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · shares: On September 10, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 6,461 shares, 7,771 shares and 347 shares of Class A Common Stock of the Issuer, respectively.

F1 · price: On September 10, 2025, Bessemer Venture Partners VIII L.P. ("BVP VIII"), Bessemer Venture Partners VIII Institutional L.P. ("BVP VIII Inst") and 15 Angels II LLC ("15 Angels" and together with BVP VIII and BVP VIII Inst, the "Bessemer Funds") sold 6,461 shares, 7,771 shares and 347 shares of Class A Common Stock of the Issuer, respectively.

F3 · ownership.nature: The Reporting Person is a partner at Bessemer Venture Partners and has an indirect, passive economic interest in the shares held by the Bessemer Funds by virtue of his interest in (1) Deer VIII & Co. L.P., the general partner of the Bessemer Funds and (2) certain other indirect limited partnership interests in certain of the Bessemer Funds. The Reporting Person disclaims beneficial ownership of the securities held by the Bessemer Funds, except to the extent of his pecuniary interest, if any, in such securities by virtue of his indirect interest in the Bessemer Funds. This report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities.

SEC source: 0000950170-25-113987 · ownership.xml · nonDerivative · entry 2

Deeter Byron B · CIK 0001506450 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

F2 · shares: On September 9, 2025, BVP VIII, BVP VIII Inst and 15 Angels II sold 181,558 shares, 150,966 shares and 8,109 shares of Class A Common Stock of the Issuer, respectively.

F2 · price: On September 9, 2025, BVP VIII, BVP VIII Inst and 15 Angels II sold 181,558 shares, 150,966 shares and 8,109 shares of Class A Common Stock of the Issuer, respectively.

F3 · ownership.nature: The Reporting Person is a partner at Bessemer Venture Partners and has an indirect, passive economic interest in the shares held by the Bessemer Funds by virtue of his interest in (1) Deer VIII & Co. L.P., the general partner of the Bessemer Funds and (2) certain other indirect limited partnership interests in certain of the Bessemer Funds. The Reporting Person disclaims beneficial ownership of the securities held by the Bessemer Funds, except to the extent of his pecuniary interest, if any, in such securities by virtue of his indirect interest in the Bessemer Funds. This report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities.