AMT insider buying and SEC filings, explained
American Tower Corp. · CIK 1053507
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$2.1M
Insiders who bought
3
Sold (not marked 10b5-1)
$1.7M
Planned sales (10b5-1)
$21.8M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 28–29, 2026 | Planned (10b5-1) | Ruth T Dowling (EVP, Chief Admin Ofr, GC & Sec) sold 1,578 shares between Oct 28 and Oct 29 at about $184.30 ($291K), marked as a 10b5-1 plan trade. Holdings down 6% to 26,133 shares. | SEC filing Filed Oct 30, 2026, 4:46 PM ET |
| Apr 28, 2023–Oct 20, 2026 | Purchase (code P) | Teresa Hillary Clarke (Director) bought 338 shares between Apr 28, 2023 and Oct 20 at about $188.38 ($64K), reported as a purchase (code P). Holdings up 6% to 5,645 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Oct 22, 2026, 5:42 PM ET |
| Aug 21, 2026 | Purchase (code P) | Rajesh Kalathur (Director) bought 2,829 shares at $177.00 ($501K), reported as a purchase (code P). Holdings up 57% to 7,765 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 25, 2026 |
| Jul 29, 2026 | Sale | Robert Joseph Meyer (CFO) sold 5,000 shares at $178.89 ($894K). Holdings down 19% to 21,428 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 31, 2026 |
| Jul 28–29, 2026 | Planned (10b5-1) | Ruth T Dowling (EVP, Chief Admin Ofr, GC & Sec) sold 1,791 shares between Jul 28 and Jul 29 at about $172.89 ($310K), marked as a 10b5-1 plan trade. Holdings down 6% to 27,711 shares. | SEC filing Filed Jul 30, 2026 |
| Apr 28–29, 2026 | Planned (10b5-1) | Ruth T Dowling (EVP, Chief Admin Ofr, GC & Sec) sold 972 shares between Apr 28 and Apr 29 at about $178.08 ($173K), marked as a 10b5-1 plan trade. Holdings down 3% to 29,461 shares. | SEC filing Filed Apr 30, 2026 |
| Mar 10, 2026 | Purchase (code P) | Rajesh Kalathur (Director) bought 2,671 shares at $185.30 ($495K), reported as a purchase (code P). Holdings up 118% to 4,936 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 12, 2026 |
| Mar 4, 2026 | Planned (10b5-1) | Steven O Vondran (CEO and Director) sold 33,482 shares at about $188.46 ($6.3M), marked as a 10b5-1 plan trade. Holdings down 24% to 105,374 shares. | SEC filing Filed Mar 6, 2026 |
| Mar 4, 2026 | Planned (10b5-1) | Ruth T Dowling (EVP, Chief Admin Ofr, GC & Sec) sold 682 shares at $188.51 ($129K), marked as a 10b5-1 plan trade. Holdings down 2% to 31,047 shares. | SEC filing Filed Mar 6, 2026 |
| Mar 2, 2026 | Planned (10b5-1) | Eugene M Noel (President / COO) sold 41,209 shares at about $191.05 ($7.9M), marked as a 10b5-1 plan trade. Holdings down 58% to 29,592 shares. | SEC filing Filed Mar 4, 2026 |
| Feb 27, 2026 | Planned (10b5-1) | Ruth T Dowling (EVP, Chief Admin Ofr, GC & Sec) sold 656 shares at $186.16 ($122K), marked as a 10b5-1 plan trade. Holdings down 2% to 31,729 shares. | SEC filing Filed Mar 3, 2026 |
| Feb 27, 2026 | Sale | Robert Joseph Meyer (SVP & Chief Accounting Officer) sold 4,454 shares at $186.73 ($832K). Holdings down 15% to 24,461 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 3, 2026 |
| Feb 17, 2026 | Planned (10b5-1) | Rodney M Smith (CFO) sold 34,341 shares at about $192.09 ($6.6M), marked as a 10b5-1 plan trade. Holdings down 32% to 74,314 shares. | SEC filing Filed Feb 19, 2026 |
| Oct 31, 2025 | Purchase (code P) | Eugene F. Reilly (Director) bought 5,554 shares at $178.99 ($994K), reported as a purchase (code P). Holdings up 999%+ to 5,689 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 4, 2025 |
28 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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