Company · Ownership research

AMERICAN TOWER CORP /MA/ AMT

CIK 0001053507

Form 4 transactions dated Nov 1, 2023 to Nov 7, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 45 rows; the complete set is available through the API.

Insider filings on file run through Nov 3, 2026.

Insider purchases & sales

Purchased: $2.05M
Sold: $66.72M

Nov 1, 2023 – Nov 3, 2026
Available records · partial months are marked ·

202610 of 20 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Oct 30, 2026	Font Juan SVP, Pres. & CEO, CoreSite	Sale	$112.26K 592 shares sold	2.08% sold Direct holding	▾
Oct 29, 2026	Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec	Sale10b5-1 footnote	$176.89K 952 shares sold	3.51% sold Direct holding	▾
Oct 28, 2026	Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec	Sale10b5-1 footnote	$113.93K 626 shares sold	2.26% sold Direct holding	▾
Oct 20, 2026	Clarke Teresa Hillary Director	Purchase	$7.86K 43 shares bought	0.77% added Direct holding	▾
Aug 21, 2026	Kalathur Rajesh Director	Purchase	$500.73K 2,829 shares bought	57.31% added Direct holding	▾
Jul 29, 2026	Meyer Robert Joseph SVP & Advisor to the CFO	Sale	$894.45K 5,000 shares sold	18.92% sold Direct holding	▾
Jul 29, 2026	Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec	Sale10b5-1 footnote	$193.51K 1,106 shares sold	3.84% sold Direct holding	▾
Jul 28, 2026	Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec	Sale10b5-1 footnote	$116.13K 685 shares sold	2.32% sold Direct holding	▾
Jul 13, 2026	Clarke Teresa Hillary Director	Purchase	$7.78K 46 shares bought	0.84% added Direct holding	▾
Apr 29, 2026	Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec	Sale10b5-1 footnote	$73.86K 416 shares sold	1.39% sold Direct holding	▾

Showing 20 / 20 record groups in 2026. The complete set is available through the API.

AMERICAN TOWER CORP /MA/ · AMT

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{"action":"list","ticker":"AMT","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Share totals are on today's split-adjusted basis. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.