Leach Jacob Steven

SEC source: 0001093557-26-000159 · wk-form4_1787688890.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director · President, CEO, and Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 418,908

F1 · shares: Represents the number of shares required to be withheld by the Issuer to cover tax withholding and remittance obligations in connection with the net settlement of restricted stock units and does not represent a sale by the Reporting Person.

F2 · balance_after: Included in this number are 142,836 unvested restricted stock units, 104,516 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 23,937 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 5,699 of which were granted on March 8, 2025 and shall vest through March 8, 2027, and 8,684 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001628280-26-043913 · wk-form4_1781727643.xml · derivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,000

Underlying: Common Stock · 100,000 shares

Expires 2036-06-15

F1 · derivative.exercise_date: Monthly over 1 year (12 equal monthly installments)

SEC source: 0001093557-26-000099 · wk-form4_1779914354.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director · President, CEO, and Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 420,359

F1 · shares: Represents the number of shares required to be withheld by the Issuer to cover tax withholding and remittance obligations in connection with the net settlement of restricted stock units and does not represent a sale by the Reporting Person.

F2 · balance_after: Included in this number are 145,686 unvested restricted stock units, 104,516 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 23,937 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 8,549 of which were granted on March 8, 2025 and shall vest through March 8, 2027, and 8,684 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000046 · wk-form4_1773172894.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · Director · President, CEO, and Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 421,810

F2 · shares: Represents the number of shares required to be withheld by the Issuer to cover tax withholding and remittance obligations in connection with the net settlement of RSUs and does not represent a sale by the Reporting Person.

F3 · balance_after: Included in this number are 148,536 unvested RSUs, 104,516 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 23,937 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 11,399 of which were granted on March 8, 2025 and shall vest through March 8, 2027, and 8,684 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000046 · wk-form4_1773172894.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director · President, CEO, and Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 441,567

F1 · shares: Represents a grant of restricted stock units (RSUs) that are exempt from Section 16b-3 and are subject to vesting in three equal annual installments from the date of grant. RSUs represent a contingent right to receive one share of DexCom, Inc. Common Stock.

SEC source: 0001093557-26-000013 · wk-form4_1770068801.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · Director · President, CEO, and Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 337,051

F2 · shares: Represents the number of shares required to be withheld by the Issuer to cover tax withholding and remittance obligations in connection with the net settlement of PSUs and does not represent a sale by the Reporting Person.

F3 · balance_after: Included in this number are 84,537 unvested restricted stock units, 35,906 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 22,798 of which were granted on March 8, 2025 and shall vest through March 8, 2027, 17,368 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 8,465 of which were granted on March 8, 2023 and shall vest through March 8, 2026, and 102 additional shares acquired under the Issuer's Amended and Restated 2015 Employee Stock Purchase Plan.

SEC source: 0001093557-26-000013 · wk-form4_1770068801.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director · President, CEO, and Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 340,109

F1 · shares: Represents shares issued to the Reporting Person upon vesting of performance-based restricted stock units (PSUs) granted to the Reporting Person on March 8, 2023, resulting from achievement of performance conditions under the PSUs.

SEC source: 0001628280-25-053306 · wk-form4_1763599720.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · balance_after: The amount of securities reported has been adjusted to reflect the 1-for-20 reverse stock split on November 15, 2022; the one-for-twelve reverse stock split on November 14, 2023; and the one-for-ten reverse stock split on July 11, 2024.

SEC source: 0001093557-25-000284 · wk-form4_1762819985.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · President & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 331,697

F2 · price: This transaction was executed in multiple trades at prices ranging from $55.34 to $55.55. The price above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

F3 · balance_after: Included in this number are 84,537 unvested restricted stock units, 35,906 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 22,798 of which were granted on March 8, 2025 and shall vest through March 8, 2027, 17,368 of which were granted on March 8, 2024 and shall vest through March 8, 2027, and 8,465 of which were granted on March 8, 2023 and shall vest through March 8, 2026.

SEC source: 0001093557-25-000284 · wk-form4_1762819985.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · President & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 329,197

F1 · price: This transaction was executed in multiple trades at prices ranging from $54.34 to $55.33. The price above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0001093557-25-000081 · wk-form4_1741987530.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP, Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 313,497

F1 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 84,537 unvested restricted stock units, 35,906 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 22,798 of which were granted on March 8, 2025 and shall vest through March 8, 2027, 17,368 of which were granted on March 8, 2024 and shall vest through March 8, 2027, and 8,465 of which were granted on March 8, 2023 and shall vest through March 8, 2026.

SEC source: 0001093557-25-000065 · wk-form4_1741735047.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP, Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 327,573

F2 · shares: Represents a grant of restricted stock units that are exempt from Section 16b-3 and are subject to vesting from the date of grant as follows: 1/2 shall vest on March 8, 2026, 1/8 shall vest on May 22, 2026, 1/8 shall vest on August 22, 2026, 1/8 shall vest on November 8, 2026, and the remaining balance shall vest on March 8, 2027. Restricted stock units represent a contingent right to receive one share of DexCom, Inc. Common Stock.

F3 · balance_after: Included in this number are 84,537 unvested restricted stock units, 35,906 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 22,798 of which were granted on March 8, 2025 and shall vest through March 8, 2027, 17,368 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 8,465 of which were granted on March 8, 2023 and shall vest through March 8, 2026, and 225 shares acquired under the Issuer's 2015 Employee Stock Purchase Plan on February 28, 2025.

SEC source: 0001093557-25-000065 · wk-form4_1741735047.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP, Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 304,775

F1 · shares: Represents a grant of restricted stock units that are exempt from Section 16b-3 and are subject to vesting in three equal annual installments from the date of grant. Restricted stock units represent a contingent right to receive one share of DexCom, Inc. Common Stock.

SEC source: 0001093557-25-000016 · wk-form4_1738280640.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP, Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 268,644

F3 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of PSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 51,972 unvested restricted stock units, 26,053 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 16,931 of which were granted on March 8, 2023 and shall vest through March 8, 2026, and 8,988 of which were granted on March 8, 2022 and shall vest through March 8, 2025.

SEC source: 0001093557-25-000016 · wk-form4_1738280640.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP, Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 271,278

F1 · kind: Represents performance stock units ("PSUs") granted to the reporting person on March 8, 2022 that vested on January 28, 2025.

F1 · shares: Represents performance stock units ("PSUs") granted to the reporting person on March 8, 2022 that vested on January 28, 2025.

F2 · balance_after: Included in this number are 51,972 unvested restricted stock units, 26,053 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 16,931 of which were granted on March 8, 2023 and shall vest through March 8, 2026, and 8,988 of which were granted on March 8, 2022 and shall vest through March 8, 2025.

SEC source: 0001093557-24-000190 · wk-form4_1734470124.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP, Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 264,171

F1 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 51,972 unvested restricted stock units, 26,053 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 16,931 of which were granted on March 8, 2023 and shall vest through March 8, 2026, and 8,988 of which were granted on March 8, 2022 and shall vest through March 8, 2025.

SEC source: 0001093557-24-000167 · wk-form4_1726095894.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP, Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 264,915

F1 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 53,432 unvested restricted stock units, 26,053 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 16,931 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 8,988 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 1,460 of which were granted on December 15, 2021 and shall vest through December 15, 2024, and 84 shares acquired under the Issuer's 2015 Employee Stock Purchase Plan on August 30, 2024.

SEC source: 0001628280-24-038710 · wk-form4_1724879634.xml · derivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,894

Underlying: Common Stock · 23,894 shares

Expires 2034-08-27

F1 · derivative.exercise_date: The option will vest and become exercisable as to 25% of the total shares on November 27, 2024, February 27, 2025, May 27, 2025 and August 27, 2025, with 100% of the options fully vested on the earlier of the first anniversary of the date of grant or the first annual meeting of stockholders of the Corporation after the date of grant (subject to the recipient's continued service to the Corporation through such vesting date).

SEC source: 0001093557-24-000127 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 265,577

F1 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 54,896 unvested restricted stock units, 26,053 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 16,931 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 8,988 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 2,924 of which were granted on December 15, 2021 and shall vest through December 15, 2024 and 145 additional shares purchased pursuant to the DexCom, Inc. 2015 Employee Stock Purchase Plan.

SEC source: 0001628280-24-015423 · wk-form4_1712689809.xml · derivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,469

Underlying: Common Stock · 4,469 shares

Expires 2029-04-08

F1 · derivative.exercise_date: Fully vested on June 30, 2024 (subject to the recipient's continued service to the Company through such vesting date).

SEC source: 0001093557-24-000051 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 266,177

F3 · shares: The transaction represents a gift by the Reporting Person of 7,736 shares to a charitable donor advised fund.

F2 · balance_after: Included in this number are 56,356 unvested restricted stock units, 26,053 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 16,931 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 8,988 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 4,384 of which were granted on December 15, 2021 and shall vest through December 15, 2024.

SEC source: 0001093557-24-000051 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 273,913

F1 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 56,356 unvested restricted stock units, 26,053 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 16,931 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 8,988 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 4,384 of which were granted on December 15, 2021 and shall vest through December 15, 2024.

SEC source: 0001093557-24-000037 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 288,552

F1 · shares: Represents a grant of restricted stock units that are exempt from Section 16b-3 and are subject to vesting in three equal annual installments from the date of grant. Restricted stock units represent a contingent right to receive one share of DexCom, Inc. Common Stock.

F2 · balance_after: Included in this number are 56,356 unvested restricted stock units, 26,053 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 16,931 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 8,988 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 4,384 of which were granted on December 15, 2021 and shall vest through December 15, 2024.

SEC source: 0001093557-24-000011 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 262,499

F3 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of PSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 58,781 unvested restricted stock units, 25,397 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 17,976 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 5,848 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 9,560 of which were granted on March 8, 2021 and shall vest through March 8, 2024.

SEC source: 0001093557-24-000011 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 266,477

F1 · kind: Represents performance stock units ("PSUs") granted to the reporting person on March 8, 2021 that vested on January 12, 2024.

F1 · shares: Represents performance stock units ("PSUs") granted to the reporting person on March 8, 2021 that vested on January 12, 2024.

F2 · balance_after: Included in this number are 58,781 unvested restricted stock units, 25,397 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 17,976 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 5,848 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 9,560 of which were granted on March 8, 2021 and shall vest through March 8, 2024.

SEC source: 0001093557-23-000255 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 256,780

F1 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 58,781 unvested restricted stock units, 25,397 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 17,976 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 5,848 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 9,560 of which were granted on March 8, 2021 and shall vest through March 8, 2024.

SEC source: 0001628280-23-023954 · wk-form4_1688078631.xml · derivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,010

Underlying: Common Stock · 41,010 shares

Expires 2028-06-26

F1 · derivative.exercise_date: The option vests and becomes exercisable as to 25% of the total shares on September 26, 2023, December 26, 2023, March 26, 2024 and June 26, 2024, with 100% of the options fully vested on the earlier of the first anniversary of the grant date or the first annual meeting of stockholders of the Company after the grant date (subject to the recipient's continued service to the Company through such vesting date).

SEC source: 0001093557-23-000110 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 259,613

F1 · shares: On December 5, 2022, Mr. Leach adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The shares set forth above were sold pursuant to the 10b5-1 Plan. The shares set forth above were sold pursuant to the 10b5-1 Plan that was intended to comply with prior version of Rule 10b5-1 promulgated under the Securities Exchange Act of 1934, as amended.

F2 · balance_after: Included in this number are 64,633 unvested restricted stock units, 25,397 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 17,976 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 11,700 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 9,560 of which were granted on March 8, 2021 and shall vest through March 8, 2024.

SEC source: 0001093557-23-000079 · edgardoc.xml · nonDerivative · entry 3

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 290,377

F1 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 64,633 unvested restricted stock units, 25,397 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 17,976 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 11,700 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 9,560 of which were granted on March 8, 2021 and shall vest through March 8, 2024.

SEC source: 0001093557-23-000079 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 294,960

F1 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 64,633 unvested restricted stock units, 25,397 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 17,976 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 11,700 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 9,560 of which were granted on March 8, 2021 and shall vest through March 8, 2024.

SEC source: 0001093557-23-000079 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 302,946

F1 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 64,633 unvested restricted stock units, 25,397 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 17,976 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 11,700 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 9,560 of which were granted on March 8, 2021 and shall vest through March 8, 2024.

SEC source: 0001093557-23-000054 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 306,486

F1 · shares: Represents a grant of restricted stock units that are exempt from Section 16 b-3 and are subject to vesting in three equal annual installments from the date of grant. Share units represent a contingent right to receive one share of DexCom, Inc. Common Stock.

F2 · balance_after: Included in this number are 64,633 unvested restricted stock units, 25,397 of which were granted on March 8, 2023 and shall vest through March 8, 2026, 17,976 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 11,700 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 9,560 of which were granted on March 8, 2021 and shall vest through March 8, 2024.

SEC source: 0001093557-23-000034 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 281,089

F1 · shares: On December 5, 2022, Mr. Leach adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F4 · price: This transaction was executed in multiple trades at prices ranging from $114.79 to $115.64. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

F3 · balance_after: Included in this number are 73,448 unvested restricted stock units, 26,964 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 11,700 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 19,120 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 15,664 of which were granted on March 8, 2020 and shall vest through March 8, 2023.

SEC source: 0001093557-23-000034 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 288,808

F1 · shares: On December 5, 2022, Mr. Leach adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · price: This transaction was executed in multiple trades at prices ranging from $113.77 to $114.755. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

F3 · balance_after: Included in this number are 73,448 unvested restricted stock units, 26,964 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 11,700 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 19,120 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 15,664 of which were granted on March 8, 2020 and shall vest through March 8, 2023.

SEC source: 0001209191-22-041323 · doc4.xml · derivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 199,071

Underlying: Common Stock · 199,071 shares

Expires 2027-07-01

F1 · derivative.exercise_date: The option vests and becomes exercisable as to 25% of the total shares on the first day of each calendar quarter following the date of grant, with 100% of the options fully vested on the earlier of the first anniversary of the grant date or the first annual meeting of stockholders of the Company after the grant date (subject to the recipient's continued service to the Company through such vesting date).This option was issued to the reporting person pursuant to the Company's Non-Employee Director Compensation Program in lieu of retainer and meeting fees of $27,000.

SEC source: 0001093557-22-000049 · edgardoc.xml · nonDerivative · entry 4

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 74,746

F3 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 18,362 unvested restricted stock units, 6,741 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 2,925 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 4,780 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 3,916 of which were granted on March 8, 2020 and shall vest through March 8, 2023.

SEC source: 0001093557-22-000049 · edgardoc.xml · nonDerivative · entry 3

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,637

F3 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 18,362 unvested restricted stock units, 6,741 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 2,925 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 4,780 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 3,916 of which were granted on March 8, 2020 and shall vest through March 8, 2023.

SEC source: 0001093557-22-000049 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 77,702

F3 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 18,362 unvested restricted stock units, 6,741 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 2,925 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 4,780 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 3,916 of which were granted on March 8, 2020 and shall vest through March 8, 2023.

SEC source: 0001093557-22-000049 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 79,019

F1 · shares: Represents a grant of restricted stock units that are exempt from Section 16 b-3 and are subject to vesting in three equal annual installments from the date of grant. Share units represent a contingent right to receive one share of DexCom, Inc. Common Stock.

F2 · balance_after: Included in this number are 18,362 unvested restricted stock units, 6,741 of which were granted on March 8, 2022 and shall vest through March 8, 2025, 2,925 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 4,780 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 3,916 of which were granted on March 8, 2020 and shall vest through March 8, 2023.

SEC source: 0001093557-21-000292 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 72,247

F1 · shares: Represents a grant of restricted stock units that are exempt from Section 16 b-3 and are subject to vesting over a 36 month period from the date of grant as follows: 1/2 shall vest 24 months from the Grant Date, 1/8 shall vest 27 months from the Grant Date, 1/8 shall vest 30 months from the grant date, 1/8 shall vest 33 months from the Grant Date, and the remaining balance shall vest 36 months from the Grant Date. Share units represent a contingent right to receive one share of DexCom Inc. Common Stock.

F2 · balance_after: Included in this number are 20,426 unvested restricted stock units, 2,925 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 7,171 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 7,832 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 2,498 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000214 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 69,322

F1 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 17,501 unvested restricted stock units, 7,171 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 7,832 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 2,498 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000214 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 69,337

F1 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 17,501 unvested restricted stock units, 7,171 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 7,832 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 2,498 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001225208-21-011565 · doc4.xml · nonDerivative · entry 3

Leach Jacob Steven · CIK 0001700255 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 150,000

F3 · price: The price shown is a weighted average sales price. The shares were purchased at prices ranging from $1.49 to $1.55 per share. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares purchased at each price within the range.

SEC source: 0001225208-21-011565 · doc4.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 100,000

F2 · price: The price shown is a weighted average sales price. The shares were purchased at prices ranging from $1.48 to $1.52 per share. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares purchased at each price within the range.

SEC source: 0001225208-21-011565 · doc4.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,000

F1 · price: The price shown is a weighted average sales price. The shares were purchased at prices ranging from $1.52 to $1.54 per share. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares purchased at each price within the range.

SEC source: 0001093557-21-000193 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 70,554

F1 · shares: On March 5, 2021, the reporting person adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 19,999 unvested restricted stock units, 7,171 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 7,832 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 4,996 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001225208-21-009710 · doc4.xml · derivative · entry 2

Leach Jacob Steven · CIK 0001700255 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 72,800

Underlying: Common Stock · 33,762 shares

Expires 2026-06-25

F2 · price: This option was issued to the reporting person pursuant to the Company's Non-Employee Director Compensation Program in lieu of retainer and meeting fees of $32,000.

F1 · derivative.exercise_date: The option vests and becomes exercisable as to 25% of the total shares on the first day of each calendar quarter following the date of grant, with 100% of the options fully vested on earlier of the first anniversary of the grant date or the first annual meeting of stockholders of the Company after the grant date (subject to the recipient's continued service to the Company through such vesting date).

SEC source: 0001225208-21-009710 · doc4.xml · derivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 39,038

Underlying: Common Stock · 39,038 shares

Expires 2026-06-25

F1 · derivative.exercise_date: The option vests and becomes exercisable as to 25% of the total shares on the first day of each calendar quarter following the date of grant, with 100% of the options fully vested on earlier of the first anniversary of the grant date or the first annual meeting of stockholders of the Company after the grant date (subject to the recipient's continued service to the Company through such vesting date).

SEC source: 0001093557-21-000167 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 82,641

F1 · shares: On March 5, 2021, the reporting person adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 19,999 unvested restricted stock units, 7,171 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 7,832 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 4,996 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000074 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 105,396

F1 · shares: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by 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 does not represent a discretionary trade by the reporting person.

F2 · balance_after: Included in this number are 19,999 unvested restricted stock units, 7,171 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 7,832 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 4,996 of which were granted on March 8, 2019 and shall vest through March 8, 2022.