Initial Registration Statement for Employee Benefit Plan (Form S-8)

As filed with the Securities and Exchange Commission on May 26, 2026

Registration No. 333-   

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-8

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

American Tower Corporation

(Exact name of registrant as specified in its charter)

Delaware		65-0723837
(State or other jurisdiction of incorporation or organization)		(I.R.S. Employer Identification No.)

222 Berkeley Street

Boston, Massachusetts 02116

(Address of Principal Executive Offices) (Zip Code)

American Tower Corporation 2026 Equity Incentive Plan

(Full title of the plan)

Steven O. Vondran

President and Chief Executive Officer

American Tower Corporation

222 Berkeley Street

Boston, Massachusetts 02116

(Name and address of agent for service)

(617) 375-7500

(Telephone number, including area code, of agent for service)

Copies to:

Ruth T. Dowling

Executive Vice President, Chief Administrative Officer, General Counsel and Secretary

American Tower Corporation

222 Berkeley Street

Boston, Massachusetts 02116

Tel: (617) 375-7500

Fax: (617) 375-7575

Michael J. Albano

Cleary Gottlieb Steen & Hamilton LLP

One Liberty Plaza

New York, New York 10006

Tel: (212) 225-2000

Fax: (212) 225-3999

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Securities Exchange Act of 1934, as amended (the "Exchange Act").

Large accelerated filer		☒		Accelerated filer		☐
Non-accelerated filer		☐		Smaller reporting company		☐
				Emerging growth company		☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act of 1933, as amended (the "Securities
Act"). ☐

EXPLANATORY NOTE

This Registration Statement on Form S-8 (this "Registration Statement") is being filed with the Securities and Exchange Commission (the "Commission") for the purpose of registering 12,000,000 shares of common stock, par value $0.01 per share ("Common Stock") of American Tower Corporation (the "Registrant") to be offered and sold with respect to future awards under the American Tower Corporation 2026 Equity Incentive Plan (the "Plan") as a result of the adoption of the Plan, which was approved by the Registrant's stockholders at the Registrant's annual meeting of stockholders held on May 20, 2026.

PART I

INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

Item 1. Plan Information; Item 2. Registrant Information and Employee Plan Annual Information

The information specified in Items 1 and 2 of Part I of Form S-8 is omitted from this filing in accordance with the provisions of Rule 428 under the Securities Act and the introductory note to Part I of Form S-8. The documents containing the information specified in Part I will be delivered to the respective participants in the Plan covered by this Registration Statement, as required by Rule 428(b)(1) of the Securities Act. Such documents are not being filed with the Commission either as part of this Registration Statement or as prospectuses or prospectus supplements pursuant to Rule 424 of the Securities Act. Such documents and the documents incorporated by reference in this Registration Statement pursuant to Item 3 of Part II hereof, taken together, constitute a prospectus that meets the requirements of Section 10(a) of the Securities Act.

PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference

The Registrant is subject to the informational and reporting requirements of Sections 13(a), 14 and 15(d) of the Exchange Act, and in accordance therewith files reports, proxy statements and other information with the Commission. The following documents (other than portions of those document furnished or otherwise not deemed filed), which are on file with the Commission, are incorporated in this Registration Statement by reference and shall be deemed to be a part hereof:

(a)

The Registrant's Annual Report on Form 10-K for the fiscal year ended December 31, 2025, as filed with the Commission on February 24, 2026;

(b)

The Registrant's Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2026, as filed with the Commission on April 28, 2026;

(c)

The Registrant's Current Reports on Form 8-K as filed with the Commission on January 28, 2026, January 29, 2026, February 27, 2026, March 5, 2026, March 10, 2026, May 7, 2026, May 19, 2026, and May 21, 2026;

(d)

The description of the Registrant's Common Stock, par value $0.01 per share, contained in the Registrant's Registration Statement on Form S-3, as filed with the Commission on June 2, 2025; and

(e)

All other reports filed by the Registrant under Section 13(a) or 15(d) of the Exchange Act since the end of the fiscal year covered by the Annual Report referred to above.

In addition to the foregoing, all documents subsequently filed with the Commission by the Registrant pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act prior to the filing of a post-effective amendment to this Registration Statement indicating that all of the securities offered hereunder have been sold or deregistering all securities then remaining unsold, shall be deemed to be incorporated by reference in this Registration Statement and to be part hereof from the date of filing of such documents (excluding information furnished but not filed in any Current Report on Form 8-K, including the related exhibits). Any statement contained in a document incorporated or deemed to be incorporated by reference in this Registration Statement shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein or in any subsequently filed document that is or is deemed to be also incorporated by reference herein modifies or supersedes such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.

Item 4. Description of Securities

Not applicable.

Item 5. Interests of Named Experts and Counsel

Not applicable.

Item 6. Indemnification of Directors and Officers

Subsection (a) of Section 145 of the General Corporation Law of the State of Delaware ("DGCL") empowers a corporation to indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of the corporation) by reason of the fact that the person is or was a director, officer, employee or agent of the corporation, or is or was serving at the request of the corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise, against expenses (including attorneys' fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by the person in connection with such action, suit or proceeding if the person acted in good faith and in a manner the person reasonably believed to be in or not opposed to the best interests of the corporation, and, with respect to any criminal action or proceeding, had no reasonable cause to believe the person's conduct was unlawful. The termination of any action, suit or proceeding by judgment, order, settlement, conviction, or upon a plea of nolo contendere or its equivalent, shall not, of itself, create a presumption that the person did not act in good faith and in a manner which the person reasonably believed to be in or not opposed to the best interests of the corporation, and, with respect to any criminal action or proceeding, had reasonable cause to believe that the person's conduct was unlawful.

Subsection (b) of Section 145 of the DGCL empowers a corporation to indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending or completed action or suit by or in the right of the corporation to procure a judgment in its favor by reason of the fact that such person acted in any of the capacities set forth above, against expenses (including attorneys' fees) actually and reasonably incurred by the person in connection with the defense or settlement of such action or suit if the person acted in good faith and in a manner the person reasonably believed to be in or not opposed to the best interests of the corporation and except that no indemnification may be made in respect of any claim, issue or matter as to which such person shall have been adjudged to be liable to the corporation unless and only to the extent that the Court of Chancery or the court in which such action or suit was brought shall determine upon application that, despite the adjudication of liability but in view of all the circumstances of the case, such person is fairly and reasonably entitled to indemnity for such

expenses which the Court of Chancery or such other court shall deem proper. Subsection (d) of Section 145 of the DGCL provides that any indemnification under subsections (a) and (b) of Section 145 (unless ordered by a court) shall be made by the corporation only as authorized in the specific case upon a determination that indemnification of the present or former director, officer, employee or agent is proper in the circumstances because the person has met the applicable standard of conduct set forth in subsections (a) and (b) of Section 145. Such determination shall be made, with respect to a person who is a director or officer at the time of such determination, (1) by a majority vote of the directors who are not parties to such action, suit or proceeding, even though less than a quorum, or (2) by a committee of such directors designated by majority vote of such directors, even though less than a quorum, or (3) if there are no such directors, or if such directors so direct, by independent legal counsel in a written opinion, or (4) by the stockholders.

Section 145 of the DGCL further provides that to the extent a present or former director or officer of a corporation has been successful on the merits or otherwise in the defense of any action, suit or proceeding referred to in subsections (a) and (b) of Section 145, or in defense of any claim, issue or matter therein, such person shall be indemnified against expenses (including attorneys' fees) actually and reasonably incurred by such person in connection therewith and that such expenses may be paid by the corporation in advance of the final disposition of such action, suit or proceeding upon receipt of an undertaking by or on behalf of such director or officer to repay such amount if it shall ultimately be determined that such person is not entitled to be indemnified by the corporation as authorized in Section 145 of the DGCL; that any indemnification and advancement of expenses provided by, or granted pursuant to, Section 145 of the DGCL shall not be deemed exclusive of any other rights to which the indemnified party may be entitled; that any indemnification and advancement of expenses provided by, or granted pursuant to, Section 145 shall, unless otherwise provided when authorized or ratified, continue as to a person who has ceased to be a director, officer, employee or agent and shall inure to the benefit of such person's heirs, executors and administrators; and empowers the corporation to purchase and maintain insurance on behalf of any person who is or was a director, officer, employee or agent of the corporation or is or was serving at the request of the corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise against any liability asserted against such person and incurred by such person in any such capacity, or arising out of such person's status as such, whether or not the corporation would have the power to indemnify such person against such liabilities under Section 145.

Section 102(b)(7) of the DGCL provides that a certificate of incorporation may contain a provision eliminating or limiting the personal liability of a director or certain officers to the corporation or its stockholders for monetary damages for breach of fiduciary duty as a director or officer, provided that such provision shall not eliminate or limit the liability of a director or officer (i) for any breach of the director's or officer's duty of loyalty to the corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) under Section 174 of the DGCL, or (iv) for any transaction from which the director or officer derived an improper personal benefit.

Article Seven of the Registrant's Certificate of Incorporation provides that the Registrant will indemnify and hold harmless, to the fullest extent permitted by applicable law, as it presently exists or may hereafter be amended, any person who was or is made or is threatened to be made a party or is otherwise involved in any action, suit or proceeding, whether civil, criminal, administrative or investigative, by reason of the fact that he, or a person for whom he is the legal representative, is or was a director, officer, or employee of the Registrant or is or was serving at the request of the Registrant as a director, officer, partner, member, trustee, employee or agent of another corporation, partnership, joint venture, limited liability company, trust, or other enterprise or nonprofit entity against all liability, losses, expenses (including attorneys' fees), judgments, fines, and amounts paid in settlement actually and reasonably incurred by such indemnitee. Notwithstanding the preceding sentence, except for proceedings to enforce rights set forth in Article Seven, the Registrant will be required under its Certificate of Incorporation to indemnify, or pay or reimburse expenses, to any director, officer, employee or other person in connection with a proceeding (or part thereof) commenced by such indemnitee only if the commencement of such proceeding (or part thereof) by the indemnitee was authorized by the Registrant's board of directors. Expenses (including attorneys' fees) incurred by a current officer or director of the Registrant in defending any civil, criminal, administrative or investigative action, suit or proceeding for which such officer or director may be entitled to indemnification under the Registrant's Certificate of Incorporation shall be paid or reimbursed in advance of the final disposition of such matter upon receipt of an undertaking by such director or officer to repay such amount unless it is determined that such person is entitled to be indemnified by the Registrant under Article Seven.

Under Delaware law, directors of the Registrant will remain liable for the following:

•

any breach of the director's duty of loyalty to the Registrant or its stockholders;

•

acts or omissions not in good faith or involving intentional misconduct or a knowing violation of law;

•

the payment of dividends, stock repurchases or redemptions that are unlawful under Delaware law; and

•

any transaction in which the director receives an improper personal benefit.

The Registrant has purchased directors' and officers' liability insurance which would indemnify its directors and officers against damages arising out of certain kinds of claims which might be made against them based on their negligent acts or omissions while acting in their capacity as such.

Item 7. Exemption from Registration Claimed

Not applicable.

Item 8. Exhibits

A list of the exhibits included as part of this Registration Statement is set forth in the Exhibit Index and is hereby incorporated by reference herein.

Item 9. Undertakings

(a)

The undersigned Registrant hereby undertakes:

(1)

To file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement:

i.

To include any prospectus required by Section 10(a)(3) of the Securities Act;

ii.

To reflect in the prospectus any facts or events arising after the effective date of the Registration Statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the Registration Statement; and

iii.

To include any material information with respect to the plan of distribution not previously disclosed in the Registration Statement or any material change to such information in the Registration Statement;

provided, however, that paragraphs (i) and (ii) do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the Registrant pursuant to Section 13 or Section 15(d) of the Exchange Act that are incorporated by reference in the Registration Statement.

(2)

That, for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(3)

To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

(b)

The undersigned Registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of the Registrant's annual report pursuant to Section 13(a) or 15(d) of the Exchange Act that is incorporated by reference in the Registration Statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(c)

Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the Registrant pursuant to the foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the Commission such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a director, officer or controlling person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

EXHIBIT INDEX

Incorporated by Reference

Exhibit Number

Description

Form

File No.

Date of Filing

Exhibit No.

4.1

Restated Certificate of Incorporation of the Registrant as filed with the Secretary of State of the State of Delaware, effective as of December 31, 2011

8-K

001-14195

January 3, 2012

3.1

4.2

Amended and Restated By-Laws of the Registrant, effective as of January 3, 2025

8-K

001-14195

January 7, 2025

3.1

4.3

American Tower Corporation 2026 Equity Incentive Plan

8-K

001-14195

May 21, 2026

10.1

5.1*

Opinion of Cleary Gottlieb Steen & Hamilton LLP

23.1*

Consent of Cleary Gottlieb Steen & Hamilton LLP (included in Exhibit 5.1 to this Registration Statement)

23.2*

Consent of Independent Registered Public Accounting Firm, Deloitte & Touche LLP

24.1*

Power of Attorney (included on the signature page to this Registration Statement)

107*

Filing Fee Table

*	Filed herewith.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Boston, Commonwealth of Massachusetts, on May 26, 2026.

POWER OF ATTORNEY

We, the undersigned officers and directors of American Tower Corporation, hereby severally constitute and appoint Steven O. Vondran and Ruth T. Dowling and each of them singly, our true and lawful attorneys with full power to any of them, and to each of them singly, to sign for us and in our names in the capacities indicated below the Registration Statement on Form S-8 filed herewith and any and all pre-effective and post-effective amendments to said Registration Statement and any related registration statements filed pursuant to Rule 462(b), and to file the same, with exhibits thereto and other documents in connection therewith, and generally to do all such things in our name and behalf in our capacities as officers and directors to enable American Tower Corporation to comply with the provisions of the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission, hereby ratifying and confirming our signatures as they may be signed by our said attorneys, or any of them, to said Registration Statement and any and all amendments thereto.

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.

Signature		Title		Date
/s/ Steven O. Vondran		President and Chief Executive Officer (Principal		May 26, 2026
Steven O. Vondran		Executive Officer)
/s/ Rodney M. Smith		Executive Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer)		May 26, 2026
Rodney M. Smith
/s/ Paul Blanchett		Senior Vice President, Chief Accounting Officer		May 26, 2026
Paul Blanchett		(Principal Accounting Officer)
/s/ Pamela D. A. Reeve		Chairperson, Director		May 26, 2026
Pamela D. A. Reeve
/s/ Kelly C. Chambliss		Director		May 26, 2026
Kelly C. Chambliss
/s/ Teresa H. Clarke		Director		May 26, 2026
Teresa H. Clarke
/s/ Kenneth R. Frank		Director		May 26, 2026
Kenneth R. Frank
/s/ Rajesh Kalathur		Director		May 26, 2026
Rajesh Kalathur
/s/ Grace D. Lieblein		Director		May 26, 2026
Grace D. Lieblein

/s/ Craig Macnab		Director		May 26, 2026
Craig Macnab
/s/ Neville R. Ray		Director		May 26, 2026
Neville R. Ray
/s/ Eugene F. Reilly		Director		May 26, 2026
Eugene F. Reilly
/s/ Bruce L. Tanner		Director		May 26, 2026
Bruce L. Tanner