DXCM

SEC source: 0001093557-26-000181 · wk-form4_1790799305.xml · nonDerivative · entry 1

Stern Sadie · CIK 0001797971 · EVP Chief People & Culture Off

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 123,478

F1 · shares: On May 28, 2026, Ms. Stern adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Ms. Stern. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 71,903 unvested restricted stock units, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 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 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000179 · wk-form4_1789590361.xml · nonDerivative · entry 2

AUGUSTINOS NICHOLAS · CIK 0001238485 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 29,293

F1 · shares: On June 10, 2026, Mr. Augustinos adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Augustinos. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · ownership.nature: Shares are held by the Kirschner/Augustinos Revocable Trust, with respect to which the Reporting Person is a trustee.

SEC source: 0001093557-26-000178 · wk-form4_1789590332.xml · nonDerivative · entry 1

Brown Michael Jon · CIK 0001899922 · EVP Chief Legal Compliance Off

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 99,885

F1 · shares: On November 26, 2025, Mr. Brown adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Brown. The shares set forth above were sold pursuant to the 10b5- 1 Plan.

F2 · balance_after: Included in this number are 71,903 unvested restricted stock units, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 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, 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027, and 83 additional shares acquired under the Issuer's Amended and Restated 2015 Employee Stock Purchase Plan.

SEC source: 0001093557-26-000179 · wk-form4_1789590361.xml · nonDerivative · entry 1

AUGUSTINOS NICHOLAS · CIK 0001238485 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 35,832

F1 · shares: On June 10, 2026, Mr. Augustinos adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Augustinos. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · ownership.nature: Shares are held by the Kirschner/Augustinos Revocable Trust, with respect to which the Reporting Person is a trustee.

SEC source: 0001093557-26-000173 · wk-form4_1789416164.xml · nonDerivative · entry 1

Sylvain Jereme M · CIK 0001681267 · EVP, Chief Financal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 146,828

F1 · shares: On June 10, 2026, Mr. Sylvain adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sylvain. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 87,094 unvested restricted stock units, 48,774 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, 8,684 of which were granted on March 8, 2024 and shall vest through March 8, 2027, and 76 additional shares acquired under the Issuer's Amended and Restated 2015 Employee Stock Purchase Plan.

SEC source: 0001093557-26-000171 · wk-form4_1789072814.xml · nonDerivative · entry 1

Boehnlein Glenn S · CIK 0001670936 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,841

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: 0001093557-26-000161 · wk-form4_1787950632.xml · nonDerivative · entry 1

Stern Sadie · CIK 0001797971 · EVP Chief People & Culture Off

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 126,043

F1 · shares: On May 28, 2026, Ms. Stern adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Ms. Stern. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 71,903 unvested restricted stock units, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 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 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

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: 0001093557-26-000158 · wk-form4_1787688882.xml · nonDerivative · entry 1

Sylvain Jereme M · CIK 0001681267 · EVP, Chief Financal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,390

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 87,094 unvested restricted stock units, 48,774 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: 0001093557-26-000157 · wk-form4_1787688876.xml · nonDerivative · entry 1

Brown Michael Jon · CIK 0001899922 · EVP Chief Legal Compliance Off

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 101,502

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 71,903 unvested restricted stock units, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 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 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000156 · wk-form4_1787688867.xml · nonDerivative · entry 1

Stern Sadie · CIK 0001797971 · EVP Chief People & Culture Off

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 128,608

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 71,903 unvested restricted stock units, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 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 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000151 · wk-form4_1787601701.xml · nonDerivative · entry 3

SAYER KEVIN R · CIK 0001286858 · Director · Executive Chair

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 302,214

F1 · shares: On February 18, 2026, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. The shares set forth above were sold pursuant to the 10b5- 1 Plan.

F3 · balance_after: Included in this number are 106,972 unvested restricted stock units, 32,749 of which were granted on March 8, 2026 and shall vest through March 8, 2027, 56,993 of which were granted on March 8, 2025 and shall vest through March 8, 2028, and 17,230 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000151 · wk-form4_1787601701.xml · nonDerivative · entry 2

SAYER KEVIN R · CIK 0001286858 · Director · Executive Chair

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 302,311

F1 · shares: On February 18, 2026, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. 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 $90.32 to $91.19. 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 106,972 unvested restricted stock units, 32,749 of which were granted on March 8, 2026 and shall vest through March 8, 2027, 56,993 of which were granted on March 8, 2025 and shall vest through March 8, 2028, and 17,230 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000151 · wk-form4_1787601701.xml · nonDerivative · entry 1

SAYER KEVIN R · CIK 0001286858 · Director · Executive Chair

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 309,662

F1 · shares: On February 18, 2026, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. 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 $89.275 to $90.25. 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 106,972 unvested restricted stock units, 32,749 of which were granted on March 8, 2026 and shall vest through March 8, 2027, 56,993 of which were granted on March 8, 2025 and shall vest through March 8, 2028, and 17,230 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000149 · wk-form4_1786997293.xml · nonDerivative · entry 1

Brown Michael Jon · CIK 0001899922 · EVP Chief Legal Compliance Off

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 102,953

F1 · shares: On November 26, 2025, Mr. Brown adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Brown. The shares set forth above were sold pursuant to the 10b5- 1 Plan.

F2 · balance_after: Included in this number are 74,753 unvested restricted stock units, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 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, 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000147 · wk-form4_1786660703.xml · nonDerivative · entry 1

AUGUSTINOS NICHOLAS · CIK 0001238485 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · by Trust

Disclosed balance after: 37,382

F1 · kind: Represents a donation of shares to a charitable donor advised fund.

F2 · ownership.nature: Shares are held by the Kirschner/Augustinos Revocable Trust, with respect to which the Reporting Person is a trustee.

SEC source: 0001485616-26-000006 · wk-form4_1786651440.xml · nonDerivative · entry 1

Heller Bridgette P · CIK 0001485616 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,570

F1 · shares: On August 14, 2025, Ms. Heller adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Ms. Heller. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 5,575 unvested restricted stock units which were granted on May 28, 2026 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders.

SEC source: 0001093557-26-000145 · wk-form4_1785875897.xml · nonDerivative · entry 2

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 48,852

F1 · shares: On March 13, 2026, The Foletta Family Trust DTD 1/30/2015 (the "Trust") adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by the Trust. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · ownership.nature: Shares are held by The Foletta Family Trust DTD 1/30/2015, with respect to which the Reporting Person is a trustee.

SEC source: 0001093557-26-000145 · wk-form4_1785875897.xml · nonDerivative · entry 1

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 50,852

F1 · shares: On March 13, 2026, The Foletta Family Trust DTD 1/30/2015 (the "Trust") adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by the Trust. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · ownership.nature: Shares are held by The Foletta Family Trust DTD 1/30/2015, with respect to which the Reporting Person is a trustee.

SEC source: 0001093557-26-000137 · wk-form4_1784667520.xml · nonDerivative · entry 1

SAYER KEVIN R · CIK 0001286858 · Director · Executive Chair

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 328,970

F1 · shares: On February 18, 2026, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. 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 $75.80 to $76.62. 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 106,972 unvested restricted stock units, 32,749 of which were granted on March 8, 2026 and shall vest through March 8, 2027, 56,993 of which were granted on March 8, 2025 and shall vest through March 8, 2028, and 17,230 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000135 · wk-form4_1784235969.xml · nonDerivative · entry 1

Brown Michael Jon · CIK 0001899922 · EVP Chief Legal Compliance Off

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 104,653

F1 · shares: On November 26, 2025, Mr. Brown adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Brown. The shares set forth above were sold pursuant to the 10b5- 1 Plan.

F2 · balance_after: Included in this number are 74,753 unvested restricted stock units, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 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 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000133 · wk-form4_1783454979.xml · nonDerivative · entry 1

SAYER KEVIN R · CIK 0001286858 · Director · Executive Chair

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 355,726

F1 · shares: On February 18, 2026, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. The shares set forth above were sold pursuant to the 10b5- 1 Plan.

F2 · balance_after: Included in this number are 106,972 unvested restricted stock units, 32,749 of which were granted on March 8, 2026 and shall vest through March 8, 2027, 56,993 of which were granted on March 8, 2025 and shall vest through March 8, 2028, and 17,230 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000131 · wk-form4_1781728348.xml · nonDerivative · entry 1

Brown Michael Jon · CIK 0001899922 · EVP Chief Legal Compliance Off

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 106,353

F1 · shares: On November 26, 2025, Mr. Brown adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Brown. The shares set forth above were sold pursuant to the 10b5- 1 Plan.

F2 · balance_after: Included in this number are 74,753 unvested restricted stock units, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 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 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000130 · wk-form4_1781728340.xml · nonDerivative · entry 2

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 52,852

F1 · shares: On March 13, 2026, The Foletta Family Trust DTD 1/30/2015 (the "Trust") adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by the Trust. 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 $74.78 to $75.55. 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 · ownership.nature: Shares are held by The Foletta Family Trust DTD 1/30/2015, with respect to which the Reporting Person is a trustee.

SEC source: 0001093557-26-000130 · wk-form4_1781728340.xml · nonDerivative · entry 1

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · by Trust

Disclosed balance after: 53,051

F1 · shares: On March 13, 2026, The Foletta Family Trust DTD 1/30/2015 (the "Trust") adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by the Trust. 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 $73.70 to $74.685. 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 · ownership.nature: Shares are held by The Foletta Family Trust DTD 1/30/2015, with respect to which the Reporting Person is a trustee.

SEC source: 0001093557-26-000127 · wk-form4_1780690655.xml · nonDerivative · entry 2

Coleman Jon · CIK 0001442689 · EVP, Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 95,450

F1 · shares: On March 4, 2026, Mr. Coleman adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Coleman. The shares set forth above were sold pursuant to the 10b5- 1 Plan.

F2 · balance_after: Included in this number are 95,450 unvested restricted stock units, 43,897 of which were granted on March 8, 2026 and shall vest through March 8, 2029, and 51,553 of which were granted on May 22, 2025 and shall vest through May 22, 2029.

SEC source: 0001093557-26-000127 · wk-form4_1780690655.xml · nonDerivative · entry 1

Coleman Jon · CIK 0001442689 · EVP, Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 100,361

F1 · shares: On March 4, 2026, Mr. Coleman adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Coleman. The shares set forth above were sold pursuant to the 10b5- 1 Plan.

SEC source: 0001093557-26-000125 · wk-form4_1780349706.xml · nonDerivative · entry 1

ALTMAN STEVEN R · CIK 0001191307 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,565

F1 · shares: The RSU Award was granted on May 28, 2026 and 100% of the RSU Award will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. Common Stock upon settlement.

SEC source: 0001093557-26-000124 · wk-form4_1780349701.xml · nonDerivative · entry 1

Malady Kyle · CIK 0001760581 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,242

F1 · shares: The RSU Award was granted on May 28, 2026 and 100% of the RSU Award will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. Common Stock upon settlement.

SEC source: 0001093557-26-000123 · wk-form4_1780349697.xml · nonDerivative · entry 1

AUGUSTINOS NICHOLAS · CIK 0001238485 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,575

F1 · shares: The RSU Award was granted on May 28, 2026 and 100% of the RSU Award will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. Common Stock upon settlement.

SEC source: 0001093557-26-000122 · wk-form4_1780349691.xml · nonDerivative · entry 1

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,331

F1 · shares: The RSU Award was granted on May 28, 2026 and 100% of the RSU Award will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. Common Stock upon settlement.

SEC source: 0001093557-26-000121 · wk-form4_1780349687.xml · nonDerivative · entry 1

Heller Bridgette P · CIK 0001485616 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,582

F1 · shares: The RSU Award was granted on May 28, 2026 and 100% of the RSU Award will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. Common Stock upon settlement.

SEC source: 0001093557-26-000120 · wk-form4_1780349682.xml · nonDerivative · entry 1

Osterloh Albert Frederick IV · CIK 0002111108 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,691

F1 · shares: The RSU Award was granted on May 28, 2026 and 100% of the RSU Award will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. Common Stock upon settlement.

F2 · balance_after: Included in this number are 8,691 unvested restricted stock units, 1,630 of which were granted on May 28, 2026 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders, and 7,061 of which were granted on February 26, 2026 and shall vest through February 26, 2029.

SEC source: 0001093557-26-000119 · wk-form4_1780349676.xml · nonDerivative · entry 1

Driscoll Rimma · CIK 0001952575 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,319

F1 · shares: The RSU Award was granted on May 28, 2026 and 100% of the RSU Award will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. Common Stock upon settlement.

F2 · balance_after: Included in this number are 6,941 unvested restricted stock units, 5,605 of which were granted on May 28, 2026 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders, and 1,336 of which were granted on August 24, 2023 and shall vest through August 24, 2026.

SEC source: 0001093557-26-000118 · wk-form4_1780349670.xml · nonDerivative · entry 1

Ashley Euan A. · CIK 0002092523 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,731

F1 · shares: The RSU Award was granted on May 28, 2026 and 100% of the RSU Award will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. Common Stock upon settlement.

F2 · balance_after: Included in this number are 12,731 unvested restricted stock units, 5,565 of which were granted on May 28, 2026 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders, and 7,166 of which were granted on October 24, 2025 and shall vest through October 24, 2028.

SEC source: 0001093557-26-000117 · wk-form4_1780349662.xml · nonDerivative · entry 1

Collins Richard Alexander · CIK 0001700619 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,605

F1 · shares: The RSU Award was granted on May 28, 2026 and 100% of the RSU Award will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. Common Stock upon settlement.

SEC source: 0001093557-26-000116 · wk-form4_1780349656.xml · nonDerivative · entry 1

GALA RENEE D · CIK 0001607737 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,486

F1 · shares: The RSU Award was granted on May 28, 2026 and 100% of the RSU Award will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. Common Stock upon settlement.

F2 · balance_after: Included in this number are 9,418 unvested restricted stock units, 5,605 of which were granted on May 28, 2026 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders, and 3,813 of which were granted on March 6, 2025 and shall vest through March 6, 2028.

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: 0001093557-26-000098 · wk-form4_1779914348.xml · nonDerivative · entry 1

Brown Michael Jon · CIK 0001899922 · EVP Chief Legal Compliance Off

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 108,053

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 74,753 unvested restricted stock units, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 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 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000097 · wk-form4_1779914342.xml · nonDerivative · entry 1

Sylvain Jereme M · CIK 0001681267 · EVP, Chief Financal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 151,841

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 89,944 unvested restricted stock units, 48,774 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: 0001093557-26-000096 · wk-form4_1779914337.xml · nonDerivative · entry 1

Stern Sadie · CIK 0001797971 · EVP Chief People & Culture Off

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 130,059

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 74,753 unvested restricted stock units, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 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 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000095 · wk-form4_1779914332.xml · nonDerivative · entry 1

Coleman Jon · CIK 0001442689 · EVP, Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 105,273

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 95,450 unvested restricted stock units, 43,897 of which were granted on March 8, 2026 and shall vest through March 8, 2029, and 51,553 of which were granted on May 22, 2025 and shall vest through May 22, 2029.

SEC source: 0001093557-26-000089 · wk-form4_1779826702.xml · nonDerivative · entry 1

SAYER KEVIN R · CIK 0001286858 · Director · Executive Chair

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 382,482

F1 · shares: On February 18, 2026, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. The shares set forth above were sold pursuant to the 10b5- 1 Plan.

F2 · balance_after: Included in this number are 106,972 unvested restricted stock units, 32,749 of which were granted on March 8, 2026 and shall vest through March 8, 2027, 56,993 of which were granted on March 8, 2025 and shall vest through March 8, 2028, and 17,230 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001093557-26-000087 · wk-form4_1779222866.xml · nonDerivative · entry 1

Brown Michael Jon · CIK 0001899922 · EVP, Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 109,504

F1 · shares: On November 26, 2025, Mr. Brown adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Brown. The shares set forth above were sold pursuant to the 10b5- 1 Plan.

F2 · balance_after: Included in this number are 77,603 unvested RSUs, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 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 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

SEC source: 0001485616-26-000004 · wk-form4_1778791153.xml · nonDerivative · entry 1

Heller Bridgette P · CIK 0001485616 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 25,007

F1 · shares: On August 14, 2025, Ms. Heller adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Ms. Heller. The shares set forth above were sold pursuant to the 10b5-1 Plan.

SEC source: 0001093557-26-000080 · wk-form4_1778541192.xml · nonDerivative · entry 2

Collins Richard Alexander · CIK 0001700619 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · by Trust

Disclosed balance after: 40,162

F1 · shares: Shares were transferred from direct ownership to ownership under the Richard A. Collins Revocable Trust upon vesting of previously awarded restricted stock units.

F2 · ownership.nature: Shares are held by the Richard A. Collins Revocable Trust, with respect to which the reporting person is a trustee.

SEC source: 0001093557-26-000080 · wk-form4_1778541192.xml · nonDerivative · entry 1

Collins Richard Alexander · CIK 0001700619 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · shares: Shares were transferred from direct ownership to ownership under the Richard A. Collins Revocable Trust upon vesting of previously awarded restricted stock units.

SEC source: 0001093557-26-000081 · wk-form4_1778541197.xml · nonDerivative · entry 2

AUGUSTINOS NICHOLAS · CIK 0001238485 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · by Trust

Disclosed balance after: 38,457

F1 · shares: Shares were transferred from direct ownership to ownership under the Kirschner/Augustinos Revocable Trust, upon vesting of previously awarded restricted stock units.

F2 · ownership.nature: Shares are held by the Kirschner/Augustinos Revocable Trust, with respect to which the reporting person is a trustee.

SEC source: 0001093557-26-000081 · wk-form4_1778541197.xml · nonDerivative · entry 1

AUGUSTINOS NICHOLAS · CIK 0001238485 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · shares: Shares were transferred from direct ownership to ownership under the Kirschner/Augustinos Revocable Trust, upon vesting of previously awarded restricted stock units.

SEC source: 0001093557-26-000079 · wk-form4_1778541186.xml · nonDerivative · entry 2

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · by Trust

Disclosed balance after: 56,852

F1 · shares: Shares were transferred from direct ownership to ownership under the Mark G. and Mary E. Foletta, TTEE's for the Foletta Family Trust DTD 1/30/15, upon vesting of previously awarded restricted stock units.

F2 · ownership.nature: Shares are held by the Mark G. and Mary E. Foletta, TTEE's for the Foletta Family Trust DTD 1/30/15, with respect to which the reporting person is a trustee.