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 2026-10-15 to 2026-11-13 · 3 filings · fetched 2026-11-13T16:38:29Z

View six-calendar-month insider history →

Recent reported activity

15purchase rows on this page

3sale rows on this page

18matching 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
2026-07-13Filed 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
2026-04-28Filed 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.