Vanguard reports 35.2M AMT shares (7.56%) in Schedule 13G (AMT)

Rhea-AI Filing Summary

American Tower Corp Schedule 13G: Vanguard Capital Management reports beneficial ownership of 35,245,879 shares of Common Stock, representing 7.56% of the class as reported. The filing shows sole dispositive power of 35,245,879 shares and sole voting power of 4,883,499 shares.

The filing is signed by Ashley Grim as Head of Global Fund Administration on 04/29/2026 and discloses that holdings include securities held for Vanguard funds and managed accounts.

Insights

Institutional Ownership Analyst

Vanguard reports a substantial passive stake in AMT with dispositive control over 35.2M shares.

The filing states 35,245,879 shares beneficially owned, equal to 7.56% of the class. This identifies Vanguard Capital Management as a sizable institutional holder exercising dispositive authority over fund and client accounts.

Because this is a Schedule 13G statement, the position is presented as passive under the filing's terms. Subsequent Form 13D or Form 4 filings would signal active engagement or transactions.

Proxy & Governance Specialist

Voting and disposition numbers matter for governance signaling.

The filing shows sole voting power of 4,883,499 shares and sole dispositive power over 35,245,879 shares. Voting influence is smaller than dispositive authority, reflecting holdings across client and fund accounts where voting may be fragmented.

Monitor future SEC filings for any changes in voting power or disclosures that could indicate coordinated engagement; timing not specified in the excerpt.

Key Figures

Shares beneficially owned: 35,245,879 shares Percent of class: 7.56% Sole voting power: 4,883,499 shares +1 more

4 metrics

Shares beneficially owned 35,245,879 shares beneficial ownership reported in Schedule 13G

Percent of class 7.56% percent of Common Stock reported

Sole voting power 4,883,499 shares shares with sole power to vote

Filing signature date 04/29/2026 signature date on Schedule 13G

Key Terms

Schedule 13G, beneficially owned, sole dispositive power, sole voting power

4 terms

Schedule 13G regulatory

"Vanguard Capital Management reports beneficial ownership of 35,245,879 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: 35245879"

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.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 35245879"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

sole voting power regulatory

"Sole power to vote or to direct the vote: 4883499"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

American Tower Corp

(Name of Issuer)

Common Stock

(Title of Class of Securities)

03027X100

(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): 03027X100

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 4,883,499.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 35,245,879.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

35,245,879.00

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)

7.56 %

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: American Tower Corp
(b)	Address of issuer's principal executive offices: 116 Huntington Avenue, 11th Floor, Boston, MA, 02116
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): 03027X100
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: 35245879
(b)	Percent of class: 7.56 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 4883499
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 35245879
	(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 AMT?

Vanguard Capital Management reports beneficial ownership of 35,245,879 shares, representing 7.56% of American Tower's common stock as stated in the filing dated 04/29/2026. The filing lists dispositive and voting powers tied to managed funds and accounts.

Does Vanguard have voting control over the reported AMT shares?

The filing shows sole voting power for 4,883,499 shares and sole dispositive power for 35,245,879 shares. That indicates dispositive authority is larger than direct voting power across the reported holdings.

What type of SEC filing did Vanguard submit for AMT and why does it matter?

Vanguard filed a Schedule 13G for AMT, a passive beneficial‑ownership disclosure used by large institutional holders. It reports ownership levels and voting/dispositive powers without asserting activist intent or control strategies.

Whose holdings are included in Vanguard's reported AMT stake?

The filing states holdings include securities held by Vanguard funds and managed client accounts over which Vanguard Capital Management and named affiliates exercise dispositive authority. It excludes securities held by other Vanguard subsidiaries disaggregated per SEC guidance.

Who signed the Schedule 13G for Vanguard's AMT filing?

The Schedule 13G excerpt is signed by Ashley Grim, listed as Head of Global Fund Administration, with the signature date shown as 04/29/2026.