Vanguard Capital Management (NASDAQ: DXCM) reports 7.49% ownership

Rhea-AI Filing Summary

Dexcom Inc Schedule 13G filer Vanguard Capital Management reports beneficial ownership of 28,848,218 shares of Common Stock, representing 7.49% of the class as of 03/31/2026. The filing states sole dispositive power over 28,848,218 shares and sole voting power over 3,827,257 shares.

The filing notes ownership includes securities held by Vanguard funds and certain affiliates exercising dispositive or voting power per SEC Release No. 34-39538. The reporting person is Vanguard Capital Management; transactions or changes after the reported date are not included in this excerpt.

Insights

Institutional Ownership Analyst

Vanguard holds a meaningful passive stake in Dexcom at 7.49%.

The disclosure shows 28,848,218 shares beneficially owned as of 03/31/2026, with sole dispositive power over those shares and sole voting power over 3,827,257 shares. This is a classic Schedule 13G disclosure for an institutional investor that indicates passive investment intent unless otherwise amended.

Watch subsequent filings for any conversion to an active holder (Schedule 13D) or material changes in voting power; timing of any such change is not provided here.

Regulatory Compliance Specialist

Filing follows 13G passive-investor format and cites SEC Release 34-39538.

The statement clarifies that ownership aggregates positions held across Vanguard funds and certain affiliates, consistent with guidance on aggregated reporting. The signature is dated 04/29/2026, which certifies the disclosure.

Investors should reference future amendments for any updates; this excerpt contains no statements of intent to change voting or disposition practices.

Key Figures

Beneficial ownership: 28,848,218 shares Percent of class: 7.49% Sole voting power: 3,827,257 shares +2 more

5 metrics

Beneficial ownership 28,848,218 shares as of 03/31/2026

Percent of class 7.49% percent of common stock as reported

Sole voting power 3,827,257 shares shares with sole power to vote

Sole dispositive power 28,848,218 shares shares with sole power to dispose

Filing type Schedule 13G passive investor disclosure

Key Terms

Schedule 13G, beneficially owned, dispositive power, SEC Release No. 34-39538

4 terms

Schedule 13G regulatory

"reports beneficial ownership of 28,848,218 shares"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

beneficially owned financial

"Amount beneficially owned: 28848218"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 28848218"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

SEC Release No. 34-39538 regulatory

"In accordance with SEC Release No. 34-39538 (January 12, 1998)"

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Dexcom Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

252131107

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 252131107

1

Names of Reporting Persons

Vanguard Capital Management

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 3,827,257.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 28,848,218.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

28,848,218.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

7.49 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard Capital Management LLC and the following affiliates of Vanguard Capital Management LLC or business divisions of such affiliates: Vanguard Asset Management Limited, Vanguard Fiduciary Trust Company, Vanguard Global Advisers, LLC and Vanguard Investments Australia Ltd. This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Capital Management LLC exercises dispositive power, in addition to securities held by clients over which the affiliates or business divisions of such affiliates indicated above exercise dispositive and/or voting power. This Schedule 13G does not include securities, if any, beneficially owned by other subsidiaries or affiliates of Vanguard Capital Management LLC, or business divisions of such subsidiaries, whose ownership of securities is disaggregated from that of the reporting business unit in accordance with such release.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Dexcom Inc
(b)	Address of issuer's principal executive offices: 6340 Sequence Drive, San Diego, CA, 92121
Item 2.
(a)	Name of person filing: Vanguard Capital Management
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd,, Malvern, PA, 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 252131107
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 28848218
(b)	Percent of class: 7.49 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 3827257
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 28848218
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Vanguard Capital Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Vanguard Capital Management

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	04/29/2026

FAQ

What stake does Vanguard Capital Management report in Dexcom (DXCM)?

Vanguard reports beneficial ownership of 28,848,218 shares, or 7.49%. The filing lists sole dispositive power over 28,848,218 shares and sole voting power over 3,827,257 shares as of 03/31/2026.

Does Vanguard control voting for all the shares it reports in DXCM?

Not all reported shares are under sole voting control. The filing shows sole voting power for 3,827,257 shares and sole dispositive power for 28,848,218 shares; shared voting or dispositive power is reported as 0.

Why does the filing mention Vanguard affiliates and funds?

The filing aggregates positions held by Vanguard funds and certain affiliates. It follows SEC Release No. 34-39538 guidance, stating dispositive power may reflect securities held across related Vanguard entities and managed accounts.

What date does the ownership information cover in the DXCM Schedule 13G?

The ownership snapshot is as of 03/31/2026. The filing is signed on 04/29/2026; any transactions after 03/31/2026 are not reflected in the reported figures.

Is this a passive disclosure or an active acquisition (13G vs 13D)?

This is a Schedule 13G submission, indicating a passive institutional investor disclosure. The excerpt does not state intent to influence control; no Schedule 13D language or active-acquirer statements are present.