DXCM

SEC source: 0001093557-18-000173 · edgardoc.xml · nonDerivative · entry 4

Pacelli Steven Robert · CIK 0001359098 · EVP, Strategy & Corp. Dev.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 122,457

F1 · shares: On June 11, 2018, 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.

F3 · balance_after: Included in this number are 69,509 unvested restricted stock units, 38,502 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 18,340 of which were granted on March 8, 2017 and shall vest through March 8, 2020, and 12,667 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000173 · edgardoc.xml · nonDerivative · entry 3

Pacelli Steven Robert · CIK 0001359098 · EVP, Strategy & Corp. Dev.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 122,557

F1 · shares: On June 11, 2018, 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.

F3 · balance_after: Included in this number are 69,509 unvested restricted stock units, 38,502 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 18,340 of which were granted on March 8, 2017 and shall vest through March 8, 2020, and 12,667 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000173 · edgardoc.xml · nonDerivative · entry 2

Pacelli Steven Robert · CIK 0001359098 · EVP, Strategy & Corp. Dev.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 122,607

F1 · shares: On June 11, 2018, 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.

F4 · price: This transaction was executed in multiple trades at prices ranging from $140.15 to $141.08. 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 69,509 unvested restricted stock units, 38,502 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 18,340 of which were granted on March 8, 2017 and shall vest through March 8, 2020, and 12,667 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000173 · edgardoc.xml · nonDerivative · entry 1

Pacelli Steven Robert · CIK 0001359098 · EVP, Strategy & Corp. Dev.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 123,357

F1 · shares: On June 11, 2018, 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 $139.11 to $140.03. 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 69,509 unvested restricted stock units, 38,502 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 18,340 of which were granted on March 8, 2017 and shall vest through March 8, 2020, and 12,667 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000169 · edgardoc.xml · nonDerivative · entry 2

Balo Andrew K · CIK 0001323190 · EVP, Reg. Strategy, Clinical

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 98,567

F1 · shares: On June 14, 2018, Mr. Balo adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Balo. 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 $124.72 to $125.25. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issurer full information regarding the number of shares and prices at which the transactions were effected.

F3 · balance_after: Included in this number are 70,343 unvested restricted stock units, 38,502 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 19,174 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 12,667 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000169 · edgardoc.xml · nonDerivative · entry 1

Balo Andrew K · CIK 0001323190 · EVP, Reg. Strategy, Clinical

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 99,117

F1 · shares: On June 14, 2018, Mr. Balo adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Balo. 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 $123.65 to $124.61. 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 70,343 unvested restricted stock units, 38,502 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 19,174 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 12,667 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000167 · edgardoc.xml · derivative · entry 5

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,645

Underlying: Common Stock · 11,161 shares

Expires 2019-05-19

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 · shares: On May 10, 2018, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. The exercise and sale of shares set forth above were pursuant to the 10b5-1 Plan.

SEC source: 0001093557-18-000167 · edgardoc.xml · nonDerivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 335,171

F1 · shares: On May 10, 2018, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. The exercise and 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 $124.06 to $124.37. 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 164,731 unvested restricted stock units, 80,545 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 54,186 of which were granted on March 8, 2017 and shall vest through March 8, 2020, 30,000 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000167 · edgardoc.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 336,349

F1 · shares: On May 10, 2018, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. The exercise and 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 $123.08 to $124.05. 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 164,731 unvested restricted stock units, 80,545 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 54,186 of which were granted on March 8, 2017 and shall vest through March 8, 2020, 30,000 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000167 · edgardoc.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 341,884

F1 · shares: On May 10, 2018, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. The exercise and sale of shares set forth above were pursuant to the 10b5-1 Plan.

F3 · price: This transaction was executed in multiple trades at prices ranging from $122.06 to $122.99. 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.

F2 · balance_after: Included in this number are 164,731 unvested restricted stock units, 80,545 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 54,186 of which were granted on March 8, 2017 and shall vest through March 8, 2020, 30,000 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000167 · edgardoc.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 346,332

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 · shares: On May 10, 2018, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. The exercise and sale of shares set forth above were pursuant to the 10b5-1 Plan.

F2 · balance_after: Included in this number are 164,731 unvested restricted stock units, 80,545 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 54,186 of which were granted on March 8, 2017 and shall vest through March 8, 2020, 30,000 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000165 · edgardoc.xml · nonDerivative · entry 4

Murphy Patrick Michael · CIK 0001692785 · VP, Legal Aff & Chf Compl Ofcr

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,680

F1 · shares: On June 15, 2018, 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.

F6 · price: This transaction was executed in multiple trades at prices ranging from $124.88 to $125.69. 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 29,391 unvested restricted stock units, 16,817 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 7,574 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 5,000 of which were granted on March 8, 2016 shall vest through March 8, 2019.

SEC source: 0001093557-18-000165 · edgardoc.xml · nonDerivative · entry 3

Murphy Patrick Michael · CIK 0001692785 · VP, Legal Aff & Chf Compl Ofcr

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,980

F1 · shares: On June 15, 2018, 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.

F5 · price: This transaction was executed in multiple trades at prices ranging from $123.88 to $124.83. 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 29,391 unvested restricted stock units, 16,817 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 7,574 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 5,000 of which were granted on March 8, 2016 shall vest through March 8, 2019.

SEC source: 0001093557-18-000165 · edgardoc.xml · nonDerivative · entry 2

Murphy Patrick Michael · CIK 0001692785 · VP, Legal Aff & Chf Compl Ofcr

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,480

F1 · shares: On June 15, 2018, 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.

F4 · price: This transaction was executed in multiple trades at prices ranging from $122.84 to $123.74. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

F3 · balance_after: Included in this number are 29,391 unvested restricted stock units, 16,817 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 7,574 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 5,000 of which were granted on March 8, 2016 shall vest through March 8, 2019.

SEC source: 0001093557-18-000165 · edgardoc.xml · nonDerivative · entry 1

Murphy Patrick Michael · CIK 0001692785 · VP, Legal Aff & Chf Compl Ofcr

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,080

F1 · shares: On June 15, 2018, 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 · price: This transaction was executed in multiple trades at prices ranging from $121.65 to $122.49. 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 29,391 unvested restricted stock units, 16,817 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 7,574 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 5,000 of which were granted on March 8, 2016 shall vest through March 8, 2019.

SEC source: 0001093557-18-000163 · edgardoc.xml · nonDerivative · entry 3

AUGUSTINOS NICHOLAS · CIK 0001238485 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 14,362

F4 · ownership.nature: Shares are held by the Kirschner/Augustinos Revocable Trust, of which the reporting person is trustee.

SEC source: 0001093557-18-000163 · edgardoc.xml · nonDerivative · entry 2

AUGUSTINOS NICHOLAS · CIK 0001238485 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,802

F3 · price: This transaction was executed in multiple trades at prices ranging from $121.39 to $122.21. 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.

F2 · balance_after: Included in this number are 3,449 restricted stock units which were granted on June 1, 2018 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting.

SEC source: 0001093557-18-000163 · edgardoc.xml · nonDerivative · entry 1

AUGUSTINOS NICHOLAS · CIK 0001238485 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,772

F1 · price: This transaction was executed in multiple trades at prices ranging from $120.37 to $121.32. 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 3,449 restricted stock units which were granted on June 1, 2018 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting.

SEC source: 0001093557-18-000161 · edgardoc.xml · nonDerivative · entry 1

MOY JEFFREY · CIK 0001446422 · SVP, Operations

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 5,061

F1 · shares: On May 29, 2018, Mr. Moy adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Moy. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · ownership.nature: 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: 0001093557-18-000153 · edgardoc.xml · nonDerivative · entry 2

Pacelli Steven Robert · CIK 0001359098 · EVP, Strategy & Corp. Dev.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 125,571

F1 · shares: On June 11, 2018, 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.

F4 · price: This transaction was executed in multiple trades at prices ranging from $102.09 to $102.60. 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 69,509 unvested restricted stock units, 38,502 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 18,340 of which were granted on March 8, 2017 and shall vest through March 8, 2020, and 12,667 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000153 · edgardoc.xml · nonDerivative · entry 1

Pacelli Steven Robert · CIK 0001359098 · EVP, Strategy & Corp. Dev.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 127,029

F1 · shares: On June 11, 2018, 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 $101.03 to $101.93. 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 69,509 unvested restricted stock units, 38,502 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 18,340 of which were granted on March 8, 2017 and shall vest through March 8, 2020, and 12,667 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000151 · edgardoc.xml · nonDerivative · entry 2

DOUBLEDAY RICHARD · CIK 0001466545 · EVP, Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 1,067

F1 · shares: On May 16, 2017 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.

F4 · price: This transaction was executed in multiple trades at prices ranging from $103.03 to $103.68. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

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: 0001093557-18-000151 · 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: 1,517

F1 · shares: On May 16, 2017 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 $102.03 to $103.00. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

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: 0001093557-18-000149 · edgardoc.xml · nonDerivative · entry 3

Balo Andrew K · CIK 0001323190 · EVP, Reg. Strategy, Clinical

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 103,567

F1 · shares: On June 14, 2018, Mr. Balo adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Balo. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F3 · balance_after: Included in this number are 70,343 unvested restricted stock units, 38,502 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 19,174 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 12,667 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000149 · edgardoc.xml · nonDerivative · entry 2

Balo Andrew K · CIK 0001323190 · EVP, Reg. Strategy, Clinical

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 104,067

F1 · shares: On June 14, 2018, Mr. Balo adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Balo. 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 $99.65 to $100.14. 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 issurer full information regarding the number of shares and prices at which the transactions were effected.

F3 · balance_after: Included in this number are 70,343 unvested restricted stock units, 38,502 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 19,174 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 12,667 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000149 · edgardoc.xml · nonDerivative · entry 1

Balo Andrew K · CIK 0001323190 · EVP, Reg. Strategy, Clinical

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 105,867

F1 · shares: On June 14, 2018, Mr. Balo adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Balo. 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 $98.65 to $99.64. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

F3 · balance_after: Included in this number are 70,343 unvested restricted stock units, 38,502 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 19,174 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 12,667 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000148 · edgardoc.xml · nonDerivative · entry 3

GREGG TERRANCE H · CIK 0001236388 · Director · Executive Chairman

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 50,882

F1 · shares: On December 5, 2017, Mr. Gregg adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Gregg. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F3 · ownership.nature: Shares are held by the Gregg Family Trust U/A/D 12/23/1998, with respect to which the reporting person is a trustee.

SEC source: 0001093557-18-000148 · edgardoc.xml · nonDerivative · entry 2

GREGG TERRANCE H · CIK 0001236388 · Director · Executive Chairman

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 51,382

F1 · shares: On December 5, 2017, Mr. Gregg adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Gregg. 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 $99.64 to $100.08. 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 · ownership.nature: Shares are held by the Gregg Family Trust U/A/D 12/23/1998, with respect to which the reporting person is a trustee.

SEC source: 0001093557-18-000148 · edgardoc.xml · nonDerivative · entry 1

GREGG TERRANCE H · CIK 0001236388 · Director · Executive Chairman

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 55,282

F1 · shares: On December 5, 2017, Mr. Gregg adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Gregg. 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 $98.64 and $99.63. 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 Gregg Family Trust U/A/D 12/23/1998, with respect to which the reporting person is a trustee.

SEC source: 0001093557-18-000145 · edgardoc.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 335,171

F1 · shares: On May 10, 2018, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F5 · price: This transaction was executed in multiple trades at prices ranging from $100.50 to 100.74. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

F3 · balance_after: Included in this number are 164,731 unvested restricted stock units, 80,545 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 54,186 of which were granted on March 8, 2017 and shall vest through March 8, 2020, 30,000 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000145 · edgardoc.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 337,571

F1 · shares: On May 10, 2018, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F4 · price: This transaction was executed in multiple trades at prices ranging from $99.49 to $100.31. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

F3 · balance_after: Included in this number are 164,731 unvested restricted stock units, 80,545 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 54,186 of which were granted on March 8, 2017 and shall vest through March 8, 2020, 30,000 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000145 · edgardoc.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 345,171

F1 · shares: On May 10, 2018, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2 · price: This transaction was executed in multiple trades at prices ranging from $98.38 to $99.35. 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 164,731 unvested restricted stock units, 80,545 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 54,186 of which were granted on March 8, 2017 and shall vest through March 8, 2020, 30,000 of which were granted on March 8, 2016 and shall vest through March 8, 2019.

SEC source: 0001093557-18-000143 · edgardoc.xml · nonDerivative · entry 3

MOY JEFFREY · CIK 0001446422 · SVP, Operations

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 10,892

F1 · shares: On May 29, 2018, Mr. Moy adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Moy. 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 $92.83 to $93.34. 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: 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: 0001093557-18-000143 · edgardoc.xml · nonDerivative · entry 2

MOY JEFFREY · CIK 0001446422 · SVP, Operations

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 34,659

F1 · shares: On May 29, 2018, Mr. Moy adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Moy. 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 $91.78 to $92.76. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

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: 0001093557-18-000143 · edgardoc.xml · nonDerivative · entry 1

MOY JEFFREY · CIK 0001446422 · SVP, Operations

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 60,864

F1 · shares: On May 29, 2018, Mr. Moy adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Moy. 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 $90.78 to $91.77. 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: 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: 0001093557-18-000141 · 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: 3,648

F1 · shares: On May 16, 2017 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 $97.99 to $98.96. 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 · 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: 0001093557-18-000125 · edgardoc.xml · nonDerivative · entry 1

GREGG TERRANCE H · CIK 0001236388 · Director · Executive Chairman

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 882

F1 · shares: On December 5, 2017, Mr. Gregg adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Gregg. 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 $96.87 and $98.77. 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 Gregg Family Trust U/A/D 12/23/1998, with respect to which the reporting person is a trustee.

SEC source: 0001093557-18-000123 · edgardoc.xml · nonDerivative · entry 1

TOPOL ERIC · CIK 0001468345 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Family Holdings

Disclosed balance after: 84,562

F1 · price: This transaction was executed in multiple trades at prices ranging from $99.75 to $100.58. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

F2 · balance_after: Shares are held by Topol Family Holdings, LLC, with respect to which the reporting person is a manager and maintains voting rights of these shares.

SEC source: 0001093557-18-000121 · edgardoc.xml · nonDerivative · entry 1

MOY JEFFREY · CIK 0001446422 · SVP, Operations

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 70,085

F1 · shares: This transaction represents a gift of securities made by the reporting person. This is not a market transaction, thus no price has been reported. Transferor retains no beneficial or voting interest in the transferred shares.

F2 · 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: 0001093557-18-000119 · edgardoc.xml · nonDerivative · entry 1

Abbey Donald · CIK 0001534342 · EVP, Quality & Regulatory Afrs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 100,942

F1 · shares: These shares were sold to cover the Company's tax withholding obligation that accrued in connection with the vesting of restricted stock units previously granted.

F2 · balance_after: Included in this number are 75,175 restricted stock units, 38,502 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 18,340 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 18,333 of which were granted on May 31, 2016 and shall vest through May 31, 2019.

SEC source: 0001093557-18-000139 · edgardoc.xml · nonDerivative · entry 1

TOPOL ERIC · CIK 0001468345 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,686

F1 · shares: The RSU Award was granted on June 1, 2018 and 100% of the RSU will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. commom stock upon settlement.

SEC source: 0001093557-18-000138 · edgardoc.xml · nonDerivative · entry 1

SKYLER JAY S · CIK 0001236386 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,607

F1 · shares: The RSU Award was granted on June 1, 2018 and 100% of the RSU will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. commom stock upon settlement.

SEC source: 0001093557-18-000137 · edgardoc.xml · nonDerivative · entry 1

KAHN BARBARA · CIK 0001520391 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,449

F1 · shares: The RSU Award was granted on June 1, 2018 and 100% of the RSU will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. commom stock upon settlement.

SEC source: 0001093557-18-000136 · edgardoc.xml · nonDerivative · entry 1

Collins Richard Alexander · CIK 0001700619 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,304

F1 · shares: The RSU Award was granted on June 1, 2018 and 100% of the RSU will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. commom stock upon settlement.

F2 · balance_after: Included in this number are 3,449 restricted stock units which were granted on June 1, 2018 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting.

SEC source: 0001093557-18-000135 · edgardoc.xml · nonDerivative · entry 1

FOLETTA MARK G · CIK 0001236389 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,052

F1 · shares: The RSU Award was granted on June 1, 2018 and 100% of the RSU will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. commom stock upon settlement.

SEC source: 0001093557-18-000134 · edgardoc.xml · nonDerivative · entry 1

AUGUSTINOS NICHOLAS · CIK 0001238485 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,464

F1 · shares: The RSU Award was granted on June 1, 2018 and 100% of the RSU will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. commom stock upon settlement.

F2 · balance_after: Included in this number are 3,449 restricted stock units which were granted on June 1, 2018 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting.

SEC source: 0001093557-18-000127 · edgardoc.xml · nonDerivative · entry 1

ALTMAN STEVEN R · CIK 0001191307 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,449

F1 · shares: The RSU Award was granted on June 1, 2018 and 100% of the RSU will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting. Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. commom stock upon settlement.

SEC source: 0001093557-19-000012 · edgardoc.xml · nonDerivative · entry 2

KAHN BARBARA · CIK 0001520391 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Trust

Disclosed balance after: 27,448

F1 · shares: Shares were transferred from direct ownership to ownership under the Barbara Kahn TTEE Barbara Kahn Rev TRT DTD 6/26/96 & Robert Meyer TTEE Robert Meyer Rev Trst DTD 6/26/96, with respect to which the reporting person is a trustee.

F3 · balance_after: Shares are held by the Barbara Kahn TTEE Barbara Kahn Rev TRT DTD 6/26/96 & Robert Meyer TTEE Robert Meyer Rev Trst DTD 6/26/96, with respect to which the reporting person is a trustee.

SEC source: 0001093557-19-000012 · edgardoc.xml · nonDerivative · entry 1

KAHN BARBARA · CIK 0001520391 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,449

F1 · shares: Shares were transferred from direct ownership to ownership under the Barbara Kahn TTEE Barbara Kahn Rev TRT DTD 6/26/96 & Robert Meyer TTEE Robert Meyer Rev Trst DTD 6/26/96, with respect to which the reporting person is a trustee.

F2 · balance_after: Represents 3,449 unvested restricted stock units which were granted on June 1, 2018 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting.

SEC source: 0001093557-19-000029 · edgardoc.xml · nonDerivative · entry 2

SKYLER JAY S · CIK 0001236386 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · by Partnership

Disclosed balance after: 26,810

F1 · shares: Shares were transferred from direct ownership to ownership under the Skyler Bach Family Limited Partnership, LLP, upon vesting of previously awarded restricted stock units.