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Dexcom (DXCM) director Augustinos donates 1,075 shares and reports 5,575 RSUs

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

DEXCOM INC director Nicholas Augustinos reported a bona fide gift of 1,075 shares of Dexcom common stock on 2026-08-12. The donated shares were held indirectly through the Kirschner/Augustinos Revocable Trust and were contributed to a charitable donor advised fund, leaving 37,382 shares held by the trust. Separately, Augustinos holds 5,575 unvested restricted stock units granted on May 28, 2026, which will vest on the earlier of the one-year anniversary of that grant or DexCom, Inc.'s 2027 Annual Meeting of Stockholders.

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Insider AUGUSTINOS NICHOLAS
Role Director
Type Security Shares Price Value
Gift Common Stock F1, F2 1,075 $0.00 $0.00
holding Common Stock F3 -- -- --
Holdings After Transaction: Common Stock — 37,382 shares (Indirect, by Trust); Common Stock — 5,575 shares (Direct)
Footnotes (3)
  1. F1. Represents a donation of shares to a charitable donor advised fund.
  2. F2. Shares are held by the Kirschner/Augustinos Revocable Trust, with respect to which the Reporting Person is a trustee.
  3. F3. Represents unvested restricted stock units which were granted on May 28, 2026 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders.
Gifted shares 1,075 shares Bona fide gift of common stock on 2026-08-12
Gift price per share $0.0000 Reported transaction price for the gifted shares
Indirect holdings after gift 37,382 shares Shares held by Kirschner/Augustinos Revocable Trust post-transaction
Unvested RSUs 5,575 units Restricted stock units granted May 28, 2026
RSU vesting condition Earlier of 1 year from 2026-05-28 or 2027 meeting Vesting tied to grant anniversary or 2027 Annual Meeting of Stockholders
bona fide gift financial
"Transaction code G is described as a bona fide gift of shares."
A bona fide gift is a genuine, voluntary transfer of money, property, or benefits from one party to another made without expectation of repayment, services, or hidden conditions. Investors care because such gifts can affect company disclosures, related‑party transaction rules, tax treatment, and perceived conflicts of interest; think of it like someone giving you a present with no strings attached — but on a corporate scale, auditors and regulators need to verify it really is unconditional.
donor advised fund financial
"Represents a donation of shares to a charitable donor advised fund."
A donor advised fund is a charitable savings account you fund with cash or assets (including stocks) that lets you take an immediate tax benefit while recommending when and which charities receive grants over time. Think of it like a dedicated piggy bank for giving: you get tax relief when you put money in, can avoid selling appreciated securities and triggering capital gains, and still control the timing and recipients of donations, which affects tax planning, portfolio decisions, and public giving signals.
Revocable Trust financial
"Shares are held by the Kirschner/Augustinos Revocable Trust."
A revocable trust is a legal arrangement where the person who creates it keeps control and can change or cancel the trust at any time, while naming who will manage and receive the assets later. Think of it like a flexible folder for your investments and property that can be relabeled or reworked as circumstances change; it matters to investors because it determines how ownership is recorded, how easily assets transfer on incapacity or death, and whether holdings bypass public probate proceedings.
restricted stock units financial
"Represents unvested restricted stock units which were granted on May 28, 2026."
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
Annual Meeting of Stockholders financial
"RSUs vest by the one year anniversary or the 2027 Annual Meeting of Stockholders."

FAQ

What insider transaction did Dexcom (DXCM) director Nicholas Augustinos report?

Nicholas Augustinos reported a bona fide gift of 1,075 Dexcom common shares on 2026-08-12. The donated shares were held indirectly through a revocable trust and contributed to a charitable donor advised fund, reducing that trust’s reported holdings but not generating sale proceeds.

How many Dexcom (DXCM) shares did the Augustinos trust hold after the gift?

After the reported gift, the Kirschner/Augustinos Revocable Trust held 37,382 Dexcom common shares indirectly for Nicholas Augustinos. These trust-held shares remain reported as indirect ownership, with Augustinos serving as a trustee according to the filing footnote.

Did the Dexcom (DXCM) insider gift involve any sale proceeds?

No, the transaction was a bona fide gift of 1,075 shares at a reported price of $0.0000 per share. The filing specifies that the shares were donated to a charitable donor advised fund, indicating a non-sale, non-cash disposition of stock for charitable purposes.

What direct Dexcom (DXCM) equity does Nicholas Augustinos hold after this filing?

Nicholas Augustinos directly holds 5,575 unvested restricted stock units. These RSUs were granted on May 28, 2026 and will vest on the earlier of the grant’s one-year anniversary or DexCom, Inc.'s 2027 Annual Meeting of Stockholders, providing potential future share delivery.

Were the Dexcom (DXCM) transactions under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked as an affirmative plan. There is no footnote stating that the gift or holdings were executed under a Rule 10b5-1 or similar pre-arranged trading plan in this disclosure.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
AUGUSTINOS NICHOLAS

(Last)(First)(Middle)
6340 SEQUENCE DRIVE

(Street)
SAN DIEGO CALIFORNIA 92121

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
DEXCOM INC [ DXCM ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/12/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock08/12/2026G(1)1,075D$037,382Iby Trust(2)
Common Stock5,575(3)D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Represents a donation of shares to a charitable donor advised fund.
2. Shares are held by the Kirschner/Augustinos Revocable Trust, with respect to which the Reporting Person is a trustee.
3. Represents unvested restricted stock units which were granted on May 28, 2026 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders.
Remarks:
/s/ Jereme M. Sylvain, as Attorney-in-Fact for Nicholas Augustinos08/13/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)