DXCM

SEC source: 0001093557-21-000274 · edgardoc.xml · nonDerivative · entry 1

Regan Barry J. · CIK 0001746313 · EVP Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,457

F1 · shares: On September 14, 2021, Mr. Regan adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Regan. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 11,457 unvested restricted stock units, 5,301 of which were granted on March 8, 2021 and shall vest through March 8, 2024, and 6,156 of which were granted on November 19, 2020 and shall vest through November 19, 2024.

SEC source: 0001093557-21-000272 · edgardoc.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,292

F1 · shares: On June 4, 2021, 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 9,759 unvested restricted stock units, 5,301 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 3,654 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 804 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000270 · edgardoc.xml · nonDerivative · entry 8

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 12,597

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F9 · price: This transaction was executed in multiple trades at prices ranging from $568.675 to $569.56. 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.

F2 · balance_after: 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.

SEC source: 0001093557-21-000270 · edgardoc.xml · nonDerivative · entry 7

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 12,638

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F8 · price: This transaction was executed in multiple trades at prices ranging from $567.295 to $567.41. 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.

F2 · balance_after: 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.

SEC source: 0001093557-21-000270 · edgardoc.xml · nonDerivative · entry 6

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 12,640

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F7 · price: This transaction was executed in multiple trades at prices ranging from $565.13 to $565.55. 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.

F2 · balance_after: 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.

SEC source: 0001093557-21-000270 · edgardoc.xml · nonDerivative · entry 5

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 12,727

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F6 · price: This transaction was executed in multiple trades at prices ranging from $563.83 to $564.74. 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.

F2 · balance_after: 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.

SEC source: 0001093557-21-000270 · edgardoc.xml · nonDerivative · entry 4

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 12,792

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F5 · price: This transaction was executed in multiple trades at prices ranging from $562.48 to $563.00. 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.

F2 · balance_after: 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.

SEC source: 0001093557-21-000270 · edgardoc.xml · nonDerivative · entry 3

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 12,908

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. 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 $561.31 to $561.925. 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.

F2 · balance_after: 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.

SEC source: 0001093557-21-000270 · edgardoc.xml · nonDerivative · entry 2

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 12,986

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F3 · price: This transaction was executed in multiple trades at prices ranging from $558.40 to $559.14. 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.

F2 · balance_after: 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.

SEC source: 0001093557-21-000270 · edgardoc.xml · nonDerivative · entry 1

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,056

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: 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.

SEC source: 0001093557-21-000264 · edgardoc.xml · nonDerivative · entry 2

Stern Sadie · CIK 0001797971 · EVP Chief Human Resources Off

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,790

F3 · shares: On August 3, 2021, 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 11,790 unvested restricted stock units, 5,634 of which were granted on March 8, 2021 and shall vest through March 8, 2024, and 6,156 of which were granted on November 19, 2020 and shall vest through November 19, 2024.

SEC source: 0001093557-21-000260 · edgardoc.xml · nonDerivative · entry 1

Pacelli Steven Robert · CIK 0001359098 · Managing Dir., Dexcom Ventures

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,579

F1 · shares: On June 14, 2021, Mr. Pacelli adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Pacelli. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 13,673 unvested restricted stock units, 5,301 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 5,874 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: 0001093557-21-000264 · edgardoc.xml · nonDerivative · entry 1

Stern Sadie · CIK 0001797971 · EVP Chief Human Resources Off

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,985

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 11,790 unvested restricted stock units, 5,634 of which were granted on March 8, 2021 and shall vest through March 8, 2024, and 6,156 of which were granted on November 19, 2020 and shall vest through November 19, 2024.

SEC source: 0001093557-21-000263 · edgardoc.xml · nonDerivative · entry 1

Regan Barry J. · CIK 0001746313 · EVP Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,671

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 11,457 unvested restricted stock units, 5,301 of which were granted on March 8, 2021 and shall vest through March 8, 2024, and 6,156 of which were granted on November 19, 2020 and shall vest through November 19, 2024.

SEC source: 0001093557-21-000258 · edgardoc.xml · nonDerivative · entry 1

Selvaraj Shelly Ramasamy · CIK 0001805707 · SVP Information Technology

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,764

F1 · shares: The transaction represents a gift by the Reporting Person of 250 shares to a charitable donor advised fund.

F2 · balance_after: Included in this number are 8,106 unvested restricted stock units, 3,073 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 3,655 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 1,378 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000257 · edgardoc.xml · nonDerivative · entry 8

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 84,705

F3 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000257 · edgardoc.xml · nonDerivative · entry 7

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 84,755

F3 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000257 · edgardoc.xml · nonDerivative · entry 6

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 84,805

F3 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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.

F8 · price: This transaction was executed in multiple trades at prices ranging from $648.64 to $649.475. 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.

F2 · balance_after: Included in this number are 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000257 · edgardoc.xml · nonDerivative · entry 5

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 85,683

F3 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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.

F7 · price: This transaction was executed in multiple trades at prices ranging from $647.64 to $648.53. 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.

F2 · balance_after: Included in this number are 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000257 · edgardoc.xml · nonDerivative · entry 4

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 87,033

F3 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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.

F6 · price: This transaction was executed in multiple trades at prices ranging from $646.57 to $646.58. 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.

F2 · balance_after: Included in this number are 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000257 · edgardoc.xml · nonDerivative · entry 3

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 87,233

F3 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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.

F5 · price: This transaction was executed in multiple trades at prices ranging from $644.99 to $645.02. 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.

F2 · balance_after: Included in this number are 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000257 · edgardoc.xml · nonDerivative · entry 2

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 87,483

F3 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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 $643.86 to $644.68. 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.

F2 · balance_after: Included in this number are 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000257 · edgardoc.xml · nonDerivative · entry 1

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 87,705

F1 · shares: The transaction represents a gift by the Reporting Person of 3,000 shares to a charitable donor advised fund.

F2 · balance_after: Included in this number are 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000254 · edgardoc.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,892

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 9,759 unvested restricted stock units, 5,301 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 3,654 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 804 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000266 · edgardoc.xml · nonDerivative · entry 1

Collins Richard Alexander · CIK 0001700619 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 7,204

F1 · date: This Form 4 is being filed late due to an inadvertent administrative oversight and not any error of the reporting person.

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: 0001093557-21-000251 · edgardoc.xml · nonDerivative · entry 11

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,097

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: 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.

SEC source: 0001093557-21-000251 · edgardoc.xml · nonDerivative · entry 10

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,137

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: 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.

SEC source: 0001093557-21-000251 · edgardoc.xml · nonDerivative · entry 9

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,177

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: 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.

SEC source: 0001093557-21-000251 · edgardoc.xml · nonDerivative · entry 8

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,219

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F6 · price: This transaction was executed in multiple trades at prices ranging from $628.24 to $628.76. 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.

F2 · balance_after: 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.

SEC source: 0001093557-21-000251 · edgardoc.xml · nonDerivative · entry 7

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,295

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F5 · price: This transaction was executed in multiple trades at prices ranging from $627.045 to $627.91. 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.

F2 · balance_after: 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.

SEC source: 0001093557-21-000251 · edgardoc.xml · nonDerivative · entry 6

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,351

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: 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.

SEC source: 0001093557-21-000251 · edgardoc.xml · nonDerivative · entry 5

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,358

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. 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 $624.96 to $625.75. 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.

F2 · balance_after: 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.

SEC source: 0001093557-21-000251 · edgardoc.xml · nonDerivative · entry 4

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,482

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F3 · price: This transaction was executed in multiple trades at prices ranging from $623.955 to $624.12. 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.

F2 · balance_after: 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.

SEC source: 0001093557-21-000251 · edgardoc.xml · nonDerivative · entry 3

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,525

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: 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.

SEC source: 0001093557-21-000251 · edgardoc.xml · nonDerivative · entry 2

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,538

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: 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.

SEC source: 0001093557-21-000251 · edgardoc.xml · nonDerivative · entry 1

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,552

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: 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.

SEC source: 0001093557-21-000252 · edgardoc.xml · nonDerivative · entry 1

AUGUSTINOS NICHOLAS · CIK 0001238485 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 918

F1 · shares: On March 4, 2021, Mr. Augustinos adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Augustinos. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F2 · price: This transaction was executed in multiple trades at prices ranging from $600.00 to $600.295. 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 918 restricted stock units which were granted on May 21, 2021 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2022 Annual Meeting.

SEC source: 0001093557-21-000241 · edgardoc.xml · nonDerivative · entry 1

Pacelli Steven Robert · CIK 0001359098 · Managing Dir., Dexcom Ventures

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,829

F1 · shares: On June 14, 2021, Mr. Pacelli adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Pacelli. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 13,673 unvested restricted stock units, 5,301 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 5,874 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: 0001093557-21-000239 · edgardoc.xml · nonDerivative · entry 9

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 90,705

F1 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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.

F11 · price: This transaction was executed in multiple trades at prices ranging from $555.68 to $556.085. 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 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000239 · edgardoc.xml · nonDerivative · entry 8

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 91,319

F1 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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.

F10 · price: This transaction was executed in multiple trades at prices ranging from $554.63 to $555.42. 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 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000239 · edgardoc.xml · nonDerivative · entry 7

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 91,669

F1 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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.

F9 · price: This transaction was executed in multiple trades at prices ranging from $553.13 to $553.15. 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 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000239 · edgardoc.xml · nonDerivative · entry 6

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 91,869

F1 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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.

F8 · price: This transaction was executed in multiple trades at prices ranging from $550.80 to $551.09. 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 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000239 · edgardoc.xml · nonDerivative · entry 5

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 92,720

F1 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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.

F7 · price: This transaction was executed in multiple trades at prices ranging from $549.73 to $550.15. 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 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000239 · edgardoc.xml · nonDerivative · entry 4

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 92,840

F1 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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.

F6 · price: This transaction was executed in multiple trades at prices ranging from $548.41 to $549.31. 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 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000239 · edgardoc.xml · nonDerivative · entry 3

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 93,521

F1 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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.

F5 · price: This transaction was executed in multiple trades at prices ranging from $547.395 to $548.26. 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 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000239 · edgardoc.xml · nonDerivative · entry 2

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 94,460

F1 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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 $546.34 to $547.28. 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 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000239 · edgardoc.xml · nonDerivative · entry 1

SAYER KEVIN R · CIK 0001286858 · Director · Chairman, CEO & President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 95,706

F1 · shares: On July 31, 2020, Mr. Sayer adopted a 10b5-1 Plan, which was amended effective June 15, 2021. 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 $545.25 to $546.23. 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 36,385 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 5,972 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000237 · edgardoc.xml · nonDerivative · entry 1

Patterson Chad · CIK 0001850152 · EVP, Global Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,603

F1 · shares: On June 14, 2021, Mr. Patterson adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Patterson. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 9,603 unvested restricted stock units, 5,634 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 3,394 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 575 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

SEC source: 0001093557-21-000235 · edgardoc.xml · nonDerivative · entry 7

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,597

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: 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.

SEC source: 0001093557-21-000235 · edgardoc.xml · nonDerivative · entry 6

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 13,598

F1 · shares: On June 15, 2021, Mr. Foletta adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Foletta. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F5 · price: This transaction was executed in multiple trades at prices ranging from $547.00 to $547.12. 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.

F2 · balance_after: 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.