DXCM

SEC source: 0001093557-20-000249 · edgardoc.xml · nonDerivative · entry 6

Blackford Quentin S. · CIK 0001612451 · Chief Operating Officer & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 52,900

F3 · shares: On December 9, 2019, Mr. Blackford adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Blackford. 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 $398.55 to $399.50. 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 43,950 unvested restricted stock units, 12,727 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,216 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021 and 15,590 of which were granted on September 7, 2017 and shall vest through September 7, 2021.

SEC source: 0001093557-20-000249 · edgardoc.xml · nonDerivative · entry 5

Blackford Quentin S. · CIK 0001612451 · Chief Operating Officer & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 54,494

F3 · shares: On December 9, 2019, Mr. Blackford adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Blackford. 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 $397.47 to $398.384. 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 43,950 unvested restricted stock units, 12,727 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,216 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021 and 15,590 of which were granted on September 7, 2017 and shall vest through September 7, 2021.

SEC source: 0001093557-20-000249 · edgardoc.xml · nonDerivative · entry 4

Blackford Quentin S. · CIK 0001612451 · Chief Operating Officer & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 55,794

F3 · shares: On December 9, 2019, Mr. Blackford adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Blackford. 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 $396.29 to $397.22. 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 43,950 unvested restricted stock units, 12,727 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,216 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021 and 15,590 of which were granted on September 7, 2017 and shall vest through September 7, 2021.

SEC source: 0001093557-20-000257 · edgardoc.xml · nonDerivative · entry 1

Sylvain Jereme M · CIK 0001681267 · SVP, Finance & CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,532

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 10,443 unvested restricted stock units, 5,483 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 2,412 of which were granted on March 8, 2019 and shall vest through March 8, 2022 and 2,548 of which were granted on November 8, 2018 and shall vest through November 8, 2021.

SEC source: 0001093557-20-000256 · edgardoc.xml · nonDerivative · entry 3

Selvaraj Shelly Ramasamy · CIK 0001805707 · SVP Information Technology

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,855

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 12,568 unvested restricted stock units, 5,483 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 4,134 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 2,951 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000256 · edgardoc.xml · nonDerivative · entry 2

Selvaraj Shelly Ramasamy · CIK 0001805707 · SVP Information Technology

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,564

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 12,568 unvested restricted stock units, 5,483 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 4,134 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 2,951 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000256 · edgardoc.xml · nonDerivative · entry 1

Selvaraj Shelly Ramasamy · CIK 0001805707 · SVP Information Technology

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,845

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 12,568 unvested restricted stock units, 5,483 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 4,134 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 2,951 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000255 · edgardoc.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 142,577

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 56,792 unvested restricted stock units, 25,453 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 17,915 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 13,424 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000255 · edgardoc.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 145,645

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 56,792 unvested restricted stock units, 25,453 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 17,915 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 13,424 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000253 · edgardoc.xml · nonDerivative · entry 3

Murphy Patrick Michael · CIK 0001692785 · EVP, Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,732

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 17,471 unvested restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 5,857 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 2,813 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000253 · edgardoc.xml · nonDerivative · entry 2

Murphy Patrick Michael · CIK 0001692785 · EVP, Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,735

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 17,471 unvested restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 5,857 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 2,813 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000253 · edgardoc.xml · nonDerivative · entry 1

Murphy Patrick Michael · CIK 0001692785 · EVP, Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,887

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 17,471 unvested restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 5,857 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 2,813 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000254 · edgardoc.xml · nonDerivative · entry 2

Pacelli Steven Robert · CIK 0001359098 · EVP Strategy and Corporate Dev

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 68,297

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 22,722 unvested restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 7,494 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000254 · edgardoc.xml · nonDerivative · entry 1

Pacelli Steven Robert · CIK 0001359098 · EVP Strategy and Corporate Dev

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 69,580

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 22,722 unvested restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 7,494 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000252 · edgardoc.xml · nonDerivative · entry 4

MOY JEFFREY · CIK 0001446422 · EVP Operations

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 34,784

F4 · 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.

F3 · balance_after: Shares are held by the Moy Family Trust U/A/D 12/09/2013, with respect to which the reporting person is a trustee.

SEC source: 0001093557-20-000252 · edgardoc.xml · nonDerivative · entry 3

MOY JEFFREY · CIK 0001446422 · EVP Operations

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 37,361

F4 · 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.

F3 · balance_after: Shares are held by the Moy Family Trust U/A/D 12/09/2013, with respect to which the reporting person is a trustee.

SEC source: 0001093557-20-000252 · edgardoc.xml · nonDerivative · entry 2

MOY JEFFREY · CIK 0001446422 · EVP Operations

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 38,364

F1 · shares: Shares were transferred from direct ownership to ownership under the Moy Family Trust upon vesting of previously awarded restricted stock units.

F3 · balance_after: Shares are held by the Moy Family Trust U/A/D 12/09/2013, with respect to which the reporting person is a trustee.

SEC source: 0001093557-20-000252 · edgardoc.xml · nonDerivative · entry 1

MOY JEFFREY · CIK 0001446422 · EVP Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,684

F1 · shares: Shares were transferred from direct ownership to ownership under the Moy Family Trust upon vesting of previously awarded restricted stock units.

F2 · balance_after: Included in this number are 19,684 unvested restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 5,857 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 5,016 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000251 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 103,548

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 24,258 unvested restricted stock units, 11,748 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 7,494 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 5,016 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000251 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 104,831

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 24,258 unvested restricted stock units, 11,748 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 7,494 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 5,016 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000250 · edgardoc.xml · nonDerivative · entry 2

DOUBLEDAY RICHARD · CIK 0001466545 · EVP Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,812

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 26,348 unvested restricted stock units, 11,748 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 8,183 of which were granted on March 8, 2019 and shall vest through March 8, 2022 and 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000250 · edgardoc.xml · nonDerivative · entry 1

DOUBLEDAY RICHARD · CIK 0001466545 · EVP Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,214

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 26,348 unvested restricted stock units, 11,748 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 8,183 of which were granted on March 8, 2019 and shall vest through March 8, 2022 and 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000249 · edgardoc.xml · nonDerivative · entry 3

Blackford Quentin S. · CIK 0001612451 · Chief Operating Officer & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 56,317

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 43,950 unvested restricted stock units, 12,727 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,216 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021 and 15,590 of which were granted on September 7, 2017 and shall vest through September 7, 2021.

SEC source: 0001093557-20-000249 · edgardoc.xml · nonDerivative · entry 2

Blackford Quentin S. · CIK 0001612451 · Chief Operating Officer & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 57,896

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 43,950 unvested restricted stock units, 12,727 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,216 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021 and 15,590 of which were granted on September 7, 2017 and shall vest through September 7, 2021.

SEC source: 0001093557-20-000249 · edgardoc.xml · nonDerivative · entry 1

Blackford Quentin S. · CIK 0001612451 · Chief Operating Officer & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 61,193

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 43,950 unvested restricted stock units, 12,727 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,216 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021 and 15,590 of which were granted on September 7, 2017 and shall vest through September 7, 2021.

SEC source: 0001093557-20-000248 · edgardoc.xml · nonDerivative · entry 2

Balo Andrew K · CIK 0001323190 · *

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,823

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 22,722 unvested restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 7,494 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000248 · edgardoc.xml · nonDerivative · entry 1

Balo Andrew K · CIK 0001323190 · *

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,120

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 22,722 unvested restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 7,494 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000247 · edgardoc.xml · nonDerivative · entry 3

Abbey Donald · CIK 0001534342 · EVP Quality and Regulatory Aff

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,202

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 22,722 restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 7,494 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000247 · edgardoc.xml · nonDerivative · entry 2

Abbey Donald · CIK 0001534342 · EVP Quality and Regulatory Aff

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,499

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 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 22,722 restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 7,494 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000247 · edgardoc.xml · nonDerivative · entry 1

Abbey Donald · CIK 0001534342 · EVP Quality and Regulatory Aff

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 54,782

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2019, and amended effective May 11, 2020. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Abbey.

F2 · balance_after: Included in this number are 22,722 restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 7,494 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 6,417 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000235 · edgardoc.xml · nonDerivative · entry 1

Sylvain Jereme M · CIK 0001681267 · SVP, Finance & CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,817

F1 · shares: On May 26, 2020, 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 11,247 unvested restricted stock units, 5,483 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 3,216 of which were granted on March 8, 2019 and shall vest through March 8, 2022 and 2,548 of which were granted on November 8, 2018 and shall vest through November 8, 2021.

SEC source: 0001093557-20-000233 · edgardoc.xml · nonDerivative · entry 1

DOUBLEDAY RICHARD · CIK 0001466545 · EVP Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 1,530

F1 · shares: On June 3, 2019, Mr. Doubleday adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Doubleday. 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 $426.46 to $427.41. 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.

F3 · ownership.nature: Shares are held by the Doubleday Living Trust U/A/D 5/26/2015, with respect to which the reporting person is a trustee.

SEC source: 0001093557-20-000234 · edgardoc.xml · nonDerivative · entry 1

Pacelli Steven Robert · CIK 0001359098 · EVP Strategy and Corporate Dev

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 72,877

F1 · shares: On June 11, 2019, 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 · price: This transaction was executed in multiple trades at prices ranging from $426.49 to $427.41. 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.

F3 · balance_after: Included in this number are 31,636 unvested restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,991 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 12,834 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000232 · edgardoc.xml · nonDerivative · entry 7

Abbey Donald · CIK 0001534342 · EVP Quality and Regulatory Aff

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 59,941

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2019, and amended effective May 11, 2020. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Abbey.

F9 · price: This transaction was executed in multiple trades at prices ranging from $428.52 to $428.88. 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 31,636 restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,991 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 12,834 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000232 · edgardoc.xml · nonDerivative · entry 6

Abbey Donald · CIK 0001534342 · EVP Quality and Regulatory Aff

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 61,261

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2019, and amended effective May 11, 2020. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Abbey.

F8 · price: This transaction was executed in multiple trades at prices ranging from $427.41 to $428.19. 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 31,636 restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,991 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 12,834 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000232 · edgardoc.xml · nonDerivative · entry 5

Abbey Donald · CIK 0001534342 · EVP Quality and Regulatory Aff

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 62,488

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2019, and amended effective May 11, 2020. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Abbey.

F7 · price: This transaction was executed in multiple trades at prices ranging from $426.254 to $426.99. 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 31,636 restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,991 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 12,834 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000232 · edgardoc.xml · nonDerivative · entry 4

Abbey Donald · CIK 0001534342 · EVP Quality and Regulatory Aff

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,488

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2019, and amended effective May 11, 2020. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Abbey.

F6 · price: This transaction was executed in multiple trades at prices ranging from $424.74 to $425.565. 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 31,636 restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,991 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 12,834 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000232 · edgardoc.xml · nonDerivative · entry 3

Abbey Donald · CIK 0001534342 · EVP Quality and Regulatory Aff

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,888

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2019, and amended effective May 11, 2020. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Abbey.

F5 · price: This transaction was executed in multiple trades at prices ranging from $423.49 to $424.21. 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 31,636 restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,991 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 12,834 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000232 · edgardoc.xml · nonDerivative · entry 2

Abbey Donald · CIK 0001534342 · EVP Quality and Regulatory Aff

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 65,388

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2019, and amended effective May 11, 2020. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Abbey.

F4 · price: This transaction was executed in multiple trades at prices ranging from $422.409 to $423.39. 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 31,636 restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,991 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 12,834 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000232 · edgardoc.xml · nonDerivative · entry 1

Abbey Donald · CIK 0001534342 · EVP Quality and Regulatory Aff

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 67,881

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2019, and amended effective May 11, 2020. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Abbey.

F2 · price: This transaction was executed in multiple trades at prices ranging from $421.119 to $421.95. 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 31,636 restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,991 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 12,834 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000227 · wf-form4_159735707495099.xml · nonDerivative · entry 1

Dahut Karen M · CIK 0001533450 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,160

F1 · shares: Represents a grant of restricted stock units subject to vest one-third per year on the anniversary of the date of grant. Share units represent a contingent right to receive one share of DexCom, Inc. common stock.

SEC source: 0001093557-20-000223 · edgardoc.xml · nonDerivative · entry 1

Selvaraj Shelly Ramasamy · CIK 0001805707 · SVP Information Technology

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,041

F1 · shares: On May 30, 2019, Mr. Selvaraj adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Selvaraj. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 16,896 unvested restricted stock units, 5,483 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 5,512 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 5,901 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000222 · edgardoc.xml · nonDerivative · entry 1

Murphy Patrick Michael · CIK 0001692785 · EVP, Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,176

F1 · shares: On September 10, 2019, Mr. Murphy adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Murphy. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 22,225 unvested restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 7,809 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 5,605 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000221 · edgardoc.xml · nonDerivative · entry 6

ALTMAN STEVEN R · CIK 0001191307 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 42,980

F1 · shares: On February 25, 2020, Mr. Altman adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Altman. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F3 · ownership.nature: Shares are held by the Steven R. and Lisa J. Altman, TTEE's Altman Family Trust DTD 8/21/92, with respect to which the reporting person is a trustee.

SEC source: 0001093557-20-000221 · edgardoc.xml · nonDerivative · entry 5

ALTMAN STEVEN R · CIK 0001191307 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 43,364

F1 · shares: On February 25, 2020, Mr. Altman adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Altman. 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 $437.025 to $437.67. 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 Steven R. and Lisa J. Altman, TTEE's Altman Family Trust DTD 8/21/92, with respect to which the reporting person is a trustee.

SEC source: 0001093557-20-000221 · edgardoc.xml · nonDerivative · entry 4

ALTMAN STEVEN R · CIK 0001191307 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 43,489

F1 · shares: On February 25, 2020, Mr. Altman adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Altman. 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 $435.025 to $436.22. 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 Steven R. and Lisa J. Altman, TTEE's Altman Family Trust DTD 8/21/92, with respect to which the reporting person is a trustee.

SEC source: 0001093557-20-000221 · edgardoc.xml · nonDerivative · entry 3

ALTMAN STEVEN R · CIK 0001191307 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 44,060

F1 · shares: On February 25, 2020, Mr. Altman adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Altman. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F3 · ownership.nature: Shares are held by the Steven R. and Lisa J. Altman, TTEE's Altman Family Trust DTD 8/21/92, with respect to which the reporting person is a trustee.

SEC source: 0001093557-20-000221 · edgardoc.xml · nonDerivative · entry 2

ALTMAN STEVEN R · CIK 0001191307 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 44,067

F1 · shares: On February 25, 2020, Mr. Altman adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Altman. 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 $432.81 to $433.70. 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 Steven R. and Lisa J. Altman, TTEE's Altman Family Trust DTD 8/21/92, with respect to which the reporting person is a trustee.

SEC source: 0001093557-20-000221 · edgardoc.xml · nonDerivative · entry 1

ALTMAN STEVEN R · CIK 0001191307 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 44,467

F1 · shares: On February 25, 2020, Mr. Altman adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Altman. 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 $431.315 to $432.14. 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.

F3 · ownership.nature: Shares are held by the Steven R. and Lisa J. Altman, TTEE's Altman Family Trust DTD 8/21/92, with respect to which the reporting person is a trustee.

SEC source: 0001093557-20-000210 · edgardoc.xml · nonDerivative · entry 5

Pacelli Steven Robert · CIK 0001359098 · EVP Strategy and Corporate Dev

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 74,408

F1 · shares: On June 11, 2019, 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.

F5 · price: This transaction was executed in multiple trades at prices ranging from $428.83 to $429.82. 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 issurer full information regarding the number of shares and prices at which the transactions were effected.

F2 · balance_after: Included in this number are 31,636 unvested restricted stock units, 8,811 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,991 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 12,834 of which were granted on March 8, 2018 and shall vest through March 8, 2021.