SEC INSIDER TRANSACTIONS

AMERICAN TOWER CORP /MA/ (AMT) Insider Transactions

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AMT · AMERICAN TOWER CORP /MA/

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Roles: director,officer,ten_percent_owner,otherOwner nameOfficer titleOwnership: D, I, unknownoriginal or amendedTransaction fromTransaction throughFiled fromFiled throughMinimum quantityMaximum quantityMinimum priceMaximum priceMinimum calculated valueMaximum calculated valueResults per page (1–100)

OR within codes/roles; AND between categories. Roles apply to buyers and sellers. Owner predicates match the same owner. Missing values fail numeric/date filters. Value is quantity × reported price for non-derivative rows only; derivative values are unknown. Amendments stay separate; joint owners do not duplicate rows.

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Stale snapshot · Covered: filings 2026-05-14 to 2026-11-13 · 11 filings · fetched 2026-11-13T16:38:29Z

Recent reported activity

16purchase rows on this page

6sale rows on this page

25matching filing rows

Purchases and sales count original non-derivative P and S rows. Awards, gifts, exercises, derivatives and amendments are shown separately and are not described as market purchases.

Transaction / filed	Reporting owner(s)	Code / security	Quantity	Price as filed	Ownership	Source
2026-10-30Filed 2026-11-03	Font JuanOfficer · SVP, Pres. & CEO, CoreSite Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Includes 50 shares acquired under the issuer's employee stock purchase plan in May 2026. References: F1	S Sale (market/private)Common Stock · Non-derivative	592D	189.63	Direct	Form 4 ↗0001053507-26-000161
2026-10-29Filed 2026-10-30	Dowling Ruth TOfficer · EVP, Chief Admin Ofr, GC & Sec Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025. References: F1	S Sale (market/private)Common Stock · Non-derivative	952D	185.81	Direct	Form 4 ↗0001053507-26-000159
2026-10-28Filed 2026-10-30	Dowling Ruth TOfficer · EVP, Chief Admin Ofr, GC & Sec Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025. References: F1	S Sale (market/private)Common Stock · Non-derivative	626D	182	Direct	Form 4 ↗0001053507-26-000159
2026-10-20Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F2	P Purchase (market/private)Common Stock · Non-derivative	42.926A	183.2	Direct	Form 4 ↗0001053507-26-000151
2026-10-01Filed 2026-10-05	Blanchett PaulOfficer · SVP & Chief Accounting Officer Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 These restricted stock units ("RSUs") were granted pursuant to the 2026 Equity Incentive Plan and vest 1/3rd annually over three years, commencing one year from the date of grant. Each RSU represents a contingent right to receive one share of Common Stock. References: F1	A Award / grantCommon Stock · Non-derivative	16,299A	0	Direct	Form 4 ↗0001053507-26-000149
2026-08-21Filed 2026-08-25	Kalathur RajeshDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 The reporting person disclaims beneficial ownership in shares held by the reporting person's spouse's revocable trust. References:	P Purchase (market/private)Common Stock · Non-derivative	2,829A	177	Direct	Form 4 ↗0001053507-26-000139
2026-07-29Filed 2026-07-31	Meyer Robert JosephOfficer · SVP & Advisor to the CFO Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Includes 142 shares acquired under the issuer's employee stock purchase plan in May 2026. References: F1	S Sale (market/private)Common Stock · Non-derivative	5,000D	178.89	Direct	Form 4 ↗0001053507-26-000137
2026-07-29Filed 2026-07-30	Dowling Ruth TOfficer · EVP, Chief Admin Ofr, GC & Sec Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025. F2 Includes 41 shares acquired under the issuer's employee stock purchase plan in May 2026. References: F1	S Sale (market/private)Common Stock · Non-derivative	1,106D	174.96	Direct	Form 4 ↗0001053507-26-000135
2026-07-28Filed 2026-07-30	Dowling Ruth TOfficer · EVP, Chief Admin Ofr, GC & Sec Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025. F2 Includes 41 shares acquired under the issuer's employee stock purchase plan in May 2026. References: F1, F2	S Sale (market/private)Common Stock · Non-derivative	685D	169.54	Direct	Form 4 ↗0001053507-26-000135
2026-07-13Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	46.448A	167.52	Direct	Form 4 ↗0001053507-26-000151
2026-06-01Filed 2026-06-03	Meyer Robert JosephOfficer · SVP & Advisor to the CFO Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of restricted stock units previously granted under the 2007 Equity Incentive Plan, as amended. References: F1	F WithholdingCommon Stock · Non-derivative	153D	187.53	Direct	Form 4 ↗0001053507-26-000125
2026-05-28Filed 2026-06-01	REEVE PAMELA D ADirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Shares gifted to a charitable organization. References: F1	G GiftCommon Stock · Non-derivative	810D	0	Direct	Form 4 ↗0001053507-26-000121
2026-04-28Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	43.5A	177.08	Direct	Form 4 ↗0001053507-26-000151
2026-02-02Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	30.713A	178.04	Direct	Form 4 ↗0001053507-26-000151
2025-10-20Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	28.657A	189.12	Direct	Form 4 ↗0001053507-26-000151
2025-07-11Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	24.095A	223.23	Direct	Form 4 ↗0001053507-26-000151
2025-04-28Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	25.488A	209.33	Direct	Form 4 ↗0001053507-26-000151
2025-02-03Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	17.577A	187.27	Direct	Form 4 ↗0001053507-26-000151
2024-10-25Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	14.371A	227.42	Direct	Form 4 ↗0001053507-26-000151
2024-07-12Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	15.873A	204.28	Direct	Form 4 ↗0001053507-26-000151
2024-04-26Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	18.588A	172.82	Direct	Form 4 ↗0001053507-26-000151
2024-02-01Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	7.68A	199.95	Direct	Form 4 ↗0001053507-26-000151
2023-10-27Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	8.452A	171.52	Direct	Form 4 ↗0001053507-26-000151
2023-07-10Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	7.192A	193.78	Direct	Form 4 ↗0001053507-26-000151
2023-04-28Filed 2026-10-22	Clarke Teresa HillaryDirector Filing context Reported filing row; may be amended. Do not sum filings blindly. F1 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker, and inadvertently not previously reported. F2 Reflects shares acquired pursuant to a dividend reinvestment plan administered by the reporting person's broker. As of the date of this filing, the reporting person is no longer enrolled a dividend reinvestment plan administered by the reporting person's broker. References: F1	P Purchase (market/private)Common Stock · Non-derivative	6.674A	205.93	Direct	Form 4 ↗0001053507-26-000151

Imported instruments only. Joint owners do not multiply transactions. Amendments are separate filing rows, not additional trades. No aggregate trade totals are implied.