Leach Jacob Steven

SEC source: 0001093557-21-000061 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 110,749

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

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

SEC source: 0001225208-20-013965 · doc4.xml · derivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,046

Underlying: Common Stock · 27,046 shares

Expires 2025-11-05

F1 · derivative.exercise_date: The option vests and becomes exercisable as to 25% of the total shares on the first day of each calendar quarter following the date of grant provided that any portion remaining unvested as of June 30, 2021 will vest as of such date (subject to recipient's continued service to the Company through such vesting date).

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: 0001093557-20-000189 · edgardoc.xml · nonDerivative · entry 7

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 107,369

F1 · shares: On March 13, 2020, the reporting person adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F3 · balance_after: Included in this number are 31,770 unvested restricted stock units, 11,748 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 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000189 · edgardoc.xml · nonDerivative · entry 6

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 107,469

F1 · shares: On March 13, 2020, the reporting person adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F8 · price: This transaction was executed in multiple trades at prices ranging from $379.00 to $379.91. 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.

F3 · balance_after: Included in this number are 31,770 unvested restricted stock units, 11,748 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 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000189 · edgardoc.xml · nonDerivative · entry 5

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 109,451

F1 · shares: On March 13, 2020, the reporting person adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F7 · price: This transaction was executed in multiple trades at prices ranging from $377.44 to $378.34. 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 31,770 unvested restricted stock units, 11,748 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 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000189 · edgardoc.xml · nonDerivative · entry 4

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 116,917

F1 · shares: On March 13, 2020, the reporting person adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F6 · price: This transaction was executed in multiple trades at prices ranging from $376.275 to $377.15. 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 31,770 unvested restricted stock units, 11,748 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 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000189 · edgardoc.xml · nonDerivative · entry 3

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 120,398

F1 · shares: On March 13, 2020, the reporting person adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F5 · price: This transaction was executed in multiple trades at prices ranging from $375.27 to $376.261. 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 31,770 unvested restricted stock units, 11,748 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 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000189 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 122,198

F1 · shares: On March 13, 2020, the reporting person adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F4 · price: This transaction was executed in multiple trades at prices ranging from $373.97 to $374.87. 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 31,770 unvested restricted stock units, 11,748 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 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000189 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 124,798

F1 · shares: On March 13, 2020, the reporting person adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F2 · price: This transaction was executed in multiple trades at prices ranging from $372.636 to $373.08. 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 31,770 unvested restricted stock units, 11,748 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 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000097 · edgardoc.xml · nonDerivative · entry 4

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 126,498

F4 · shares: This transaction represents a gift of securities made by the reporting person's spouse. This is not a market transaction, thus no price has been reported.

F3 · balance_after: Included in this number are 31,770 unvested restricted stock units, 11,748 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 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000097 · edgardoc.xml · nonDerivative · entry 3

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 127,498

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.

F3 · balance_after: Included in this number are 31,770 unvested restricted stock units, 11,748 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 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000097 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 134,131

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.

F3 · balance_after: Included in this number are 31,770 unvested restricted stock units, 11,748 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 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000097 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 134,215

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 · price: This transaction was executed in multiple trades at prices ranging from $245.62 to $246.3456. 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 31,770 unvested restricted stock units, 11,748 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 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000075 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 134,407

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

F2 · balance_after: Included in this number are 31,770 unvested restricted stock units, 11,748 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 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

SEC source: 0001093557-20-000033 · edgardoc.xml · derivative · entry 3

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 11,458 shares

Expires 2020-02-18

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

SEC source: 0001093557-20-000033 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 122,563

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

F1 · balance_after: Included in this number are 33,890 unvested restricted stock units, 14,987 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 15,047 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 3,856 of which were granted on March 8, 2017 and shall vest through March 8, 2020.

SEC source: 0001093557-19-000196 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 111,105

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.

F3 · balance_after: Included in this number are 33,890 unvested restricted stock units, 14,987 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 15,047 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 3,856 of which were granted on March 8, 2017 and shall vest through March 8, 2020.

SEC source: 0001093557-19-000196 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 115,560

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 · price: This transaction was executed in multiple trades at prices ranging from $145.11 to $145.49. 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 33,890 unvested restricted stock units, 14,987 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 15,047 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 3,856 of which were granted on March 8, 2017 and shall vest through March 8, 2020.

SEC source: 0001093557-19-000161 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 115,781

F1 · shares: On March 13, 2019, the reporting person adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F4 · price: This transaction was executed in multiple trades at prices ranging from $146.00 to $146.58. 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.

F3 · balance_after: Included in this number are 42,760 unvested restricted stock units, 14,987 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 20,062 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 7,711 of which were granted on March 8, 2017 and shall vest through March 8, 2020.

SEC source: 0001093557-19-000161 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 116,381

F1 · shares: On March 13, 2019, the reporting person adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F2 · price: This transaction was executed in multiple trades at prices ranging from $144.99 to $145.96. 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 42,760 unvested restricted stock units, 14,987 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 20,062 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 7,711 of which were granted on March 8, 2017 and shall vest through March 8, 2020.

SEC source: 0001093557-19-000112 · edgardoc.xml · derivative · entry 3

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,797 shares

Expires 2019-11-20

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

SEC source: 0001093557-19-000112 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 120,880

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

F1 · balance_after: Included in this number are 42,760 unvested restricted stock units, 14,987 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 20,062 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 7,711 of which were granted on March 8, 2017 and shall vest through March 8, 2020.

SEC source: 0001093557-19-000081 · edgardoc.xml · nonDerivative · entry 3

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 116,083

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 42,760 unvested restricted stock units, 14,987 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 20,062 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 7,711 of which were granted on March 8, 2017 and shall vest through March 8, 2020.

SEC source: 0001093557-19-000081 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 117,759

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 42,760 unvested restricted stock units, 14,987 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 20,062 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 7,711 of which were granted on March 8, 2017 and shall vest through March 8, 2020.

SEC source: 0001093557-19-000081 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 119,637

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 42,760 unvested restricted stock units, 14,987 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 20,062 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 7,711 of which were granted on March 8, 2017 and shall vest through March 8, 2020.

SEC source: 0001093557-19-000053 · wf-form4_155235090240114.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · EVP Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 124,638

F1 · shares: Represents a grant of restricted stock units that are exempt from Section 16 b-3 and are subject to vesting over a 36 month period from the date of grant as follows: 1/3 shall vest 12 months from the Grant Date, and the remaining balance shall vest in four equal installments over the following 24 months. Share units represent a contingent right to receive one share of DexCom, Inc. common stock.

F2 · balance_after: Included in this number are 42,760 unvested restricted stock units, 14,987 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 20,062 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 7,711 of which were granted on March 8, 2017 and shall vest through March 8, 2020.

SEC source: 0001093557-18-000211 · edgardoc.xml · nonDerivative · entry 3

Leach Jacob Steven · CIK 0001700255 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · by Spouse

Disclosed balance after: 0

F1 · shares: On August 23, 2018, the reporting person's spouse adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Ms. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F5 · price: This transaction was executed in multiple trades at prices ranging from $144.13 to $144.97. 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 Kyndra S. Leach Trust UAD 12/12/2012, with respect to which the reporting person's spouse is a trustee.

SEC source: 0001093557-18-000211 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · by Spouse

Disclosed balance after: 24,731

F1 · shares: On August 23, 2018, the reporting person's spouse adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Ms. Leach. The sale of shares set forth above were pursuant to the 10b5-1 Plan.

F4 · price: This transaction was executed in multiple trades at prices ranging from $143.13 to $144.12. 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.

F3 · ownership.nature: Shares are held by the Kyndra S. Leach Trust UAD 12/12/2012, with respect to which the reporting person's spouse is a trustee.

SEC source: 0001093557-18-000211 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · by Spouse

Disclosed balance after: 38,149

F1 · shares: On August 23, 2018, the reporting person's spouse adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Ms. Leach. 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 $142.12 to $143.11. 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 Kyndra S. Leach Trust UAD 12/12/2012, with respect to which the reporting person's spouse is a trustee.

SEC source: 0001093557-18-000203 · edgardoc.xml · derivative · entry 4

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 15,000 shares

Expires 2018-10-02

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

SEC source: 0001093557-18-000203 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 109,284

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

F1 · balance_after: Included in this number are 46,994 unvested restricted stock units, 30,093 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 11,567 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 5,334 of which were granted on March 8, 2016 shall vest through March 8, 2019.

SEC source: 0001093557-18-000196 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 94,284

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 46,994 unvested restricted stock units, 30,093 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 11,567 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 5,334 of which were granted on March 8, 2016 shall vest through March 8, 2019.

SEC source: 0001093557-18-000196 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 96,962

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 46,994 unvested restricted stock units, 30,093 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 11,567 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 5,334 of which were granted on March 8, 2016 shall vest through March 8, 2019.

SEC source: 0001093557-18-000178 · edgardoc.xml · derivative · entry 8

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,000

Underlying: Common Stock · 10,000 shares

Expires 2018-10-02

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

SEC source: 0001093557-18-000178 · edgardoc.xml · derivative · entry 7

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 10,577 shares

Expires 2018-12-11

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

SEC source: 0001093557-18-000178 · edgardoc.xml · nonDerivative · entry 4

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 98,878

F1 · price: This transaction was executed in multiple trades at prices ranging from $138.19 to $138.65. 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 56,182 unvested restricted stock units, 30,093 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 15,422 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 10,667 of which were granted on March 8, 2016 shall vest through March 8, 2019.

SEC source: 0001093557-18-000178 · edgardoc.xml · nonDerivative · entry 3

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 108,878

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

SEC source: 0001093557-18-000178 · edgardoc.xml · nonDerivative · entry 2

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 98,878

F1 · price: This transaction was executed in multiple trades at prices ranging from $138.19 to $138.65. 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 56,182 unvested restricted stock units, 30,093 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 15,422 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 10,667 of which were granted on March 8, 2016 shall vest through March 8, 2019.

SEC source: 0001093557-18-000178 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 109,455

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

SEC source: 0001093557-18-000098 · edgardoc.xml · nonDerivative · entry 1

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Indirect · Family Holdings

Disclosed balance after: 11,824

F1 · shares: This transaction represents a gift of securities made by the reporting person's spouse. This is not a market transaction, thus no price has been reported.

F2 · balance_after: Shares are held by the Gregg Family Grandchildren's Trust UAD 12/30/2010, with respect to which the reporting person's spouse is a trustee.

F2 · ownership.nature: Shares are held by the Gregg Family Grandchildren's Trust UAD 12/30/2010, with respect to which the reporting person's spouse is a trustee.

SEC source: 0001093557-18-000090 · edgardoc.xml · derivative · entry 11

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 8,542 shares

Expires 2020-02-18

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

SEC source: 0001093557-18-000090 · edgardoc.xml · derivative · entry 10

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 203 shares

Expires 2019-11-20

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

SEC source: 0001093557-18-000090 · edgardoc.xml · nonDerivative · entry 6

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 98,878

F2 · price: This transaction was executed in multiple trades at prices ranging from $84.77 to $84.81. 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.

F1 · balance_after: Included in this number are 56,182 unvested restricted stock units, 30,093 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 15,422 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 10,667 of which were granted on March 8, 2016 shall vest through March 8, 2019.

SEC source: 0001093557-18-000090 · edgardoc.xml · nonDerivative · entry 5

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 99,081

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

SEC source: 0001093557-18-000090 · edgardoc.xml · nonDerivative · entry 4

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 98,878

F2 · price: This transaction was executed in multiple trades at prices ranging from $84.77 to $84.81. 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.

F1 · balance_after: Included in this number are 56,182 unvested restricted stock units, 30,093 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 15,422 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 10,667 of which were granted on March 8, 2016 shall vest through March 8, 2019.

SEC source: 0001093557-18-000090 · edgardoc.xml · nonDerivative · entry 3

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 107,420

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

SEC source: 0001093557-18-000090 · edgardoc.xml · derivative · entry 9

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,923 shares

Expires 2018-12-11

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

SEC source: 0001093557-18-000090 · edgardoc.xml · nonDerivative · entry 7

Leach Jacob Steven · CIK 0001700255 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Indirect · by Spouse

Disclosed balance after: 47,600

F3 · price: This transaction was executed in multiple trades at prices ranging from $85.14 to $85.18. 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.

F4 · ownership.nature: Shares are held by the Kyndra S. Leach Trust UAD 12/12/2012, with respect to which the reporting person's spouse is a trustee.