Were the AMT CEO’s share sales part of a Rule 10b5-1 trading plan?

Yes. A footnote explains that all sales reported in this Form 4 were made under a Rule 10b5-1 trading plan. The plan was adopted by Steven O. Vondran on May 6, 2025, before the March 4, 2026 transactions.

American Tower (NYSE: AMT) CEO exercises options and sells 33,482 shares

Filing Impact

(Very High)

Filing Sentiment

(Very Negative)

Form Type

Rhea-AI Filing Summary

American Tower’s President and CEO Steven O. Vondran reported option exercises and share sales in company stock. On March 4, 2026, he exercised options for 33,482 shares of common stock at an exercise price of $0.00 under the 2007 Equity Incentive Plan.

That same day, he sold 33,482 shares of common stock in three open-market transactions at prices of $187.90, $188.82, and $189.82 per share, with actual trade prices ranging from $187.31 to $190.09. The sales were made under a Rule 10b5-1 trading plan adopted on May 6, 2025, and left him with 105,374 shares of American Tower common stock held directly.

Insider Trade Summary

Net Seller: 33,482 shares ($6,309,967)

Net Sell 5 txns

Insider Vondran Steven O

Role President and CEO

Sold 33,482 shs ($6.31M)

Type	Security	Shares	Price	Value
Exercise	Option to Purchase Common Stock	33,482	$0.00	--
Exercise	Common Stock	33,482	$94.71	$3.17M
Sale	Common Stock	15,084	$187.90	$2.83M
Sale	Common Stock	16,625	$188.82	$3.14M
Sale	Common Stock	1,773	$189.82	$337K

Holdings After Transaction: Option to Purchase Common Stock — 0 shares (Direct); Common Stock — 138,856 shares (Direct)

Footnotes (1)

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2025. Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $187.31 to $188.30 per share. Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $188.31 to $189.30 per share. Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $189.58 to $190.09 per share. This option was granted pursuant to the 2007 Equity Incentive Plan, as amended, and is exercisable in 25% cumulative annual increments beginning March 10, 2017.

Form 4 Insider Transactions: What Each Field Means →

03/06/2026 - 04:23 PM

SEC Form 4

FORM 4

UNITED 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^*

Vondran Steven O

(Last)

(First)

(Middle)

222 BERKELEY STREET

(Street)

BOSTON

02116

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
AMERICAN TOWER CORP /MA/ [ AMT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
03/04/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	03/04/2026		M		33,482	A	$94.71	138,856	D
Common Stock	03/04/2026		S⁽¹⁾		15,084	D	$187.9⁽²⁾	123,772	D
Common Stock	03/04/2026		S⁽¹⁾		16,625	D	$188.82⁽³⁾	107,147	D
Common Stock	03/04/2026		S⁽¹⁾		1,773	D	$189.82⁽⁴⁾	105,374	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Option to Purchase Common Stock	$94.71	03/04/2026		M			33,482	⁽⁵⁾	03/10/2026	Common Stock	33,482	$0	0	D

Explanation of Responses:

1. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 6, 2025.

2. Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $187.31 to $188.30 per share.

3. Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $188.31 to $189.30 per share.

4. Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $189.58 to $190.09 per share.

5. This option was granted pursuant to the 2007 Equity Incentive Plan, as amended, and is exercisable in 25% cumulative annual increments beginning March 10, 2017.

Remarks:

	/s/ Marina A. Breed, as attorney-in-fact	03/06/2026
	** Signature of Reporting Person	Date
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.

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did AMT CEO Steven Vondran report on this Form 4?

Steven O. Vondran reported exercising options for 33,482 AMT shares and selling 33,482 common shares in open-market transactions. The trades occurred on March 4, 2026, and were executed under a pre-established Rule 10b5-1 trading plan.

How many American Tower (AMT) shares did the CEO sell and at what prices?

The CEO sold 33,482 AMT common shares in three transactions at weighted average prices of $187.90, $188.82, and $189.82 per share. Footnotes state actual sale prices ranged from $187.31 to $190.09 across multiple same-day trades.

What stock option activity did the AMT CEO report on March 4, 2026?

He reported exercising options to purchase 33,482 shares of American Tower common stock at an exercise price of $0.00. These options were granted under the 2007 Equity Incentive Plan and became exercisable in 25% annual increments beginning March 10, 2017.

How many American Tower (AMT) shares does the CEO own after these transactions?

After the reported sales, Steven O. Vondran directly owned 105,374 shares of American Tower common stock. This figure reflects his holdings immediately following the March 4, 2026 transactions disclosed in the Form 4 filing.

What equity incentive plan governs the AMT CEO’s exercised stock options?

The stock options exercised by the CEO were granted under American Tower’s 2007 Equity Incentive Plan, as amended. According to the disclosure, the options became exercisable in 25% cumulative annual increments starting on March 10, 2017.