American Tower (AMT) insider buying and selling
Every Table I transaction reported by directors and officers of S&P 500 companies on SEC Form 4 filings (2 business days to file): each row labeled with its official transaction code, nothing filtered out beforehand.
Open-market purchases (code P) are the rare signal, in green; sales (code S) are common and often pre-scheduled (10b5-1). Table II (derivatives) is not included: its prices are exercise prices, not market values. Guide: insider buying.
| Date | Ticker | Insider | Role | Shares | Price | Amount | % of stake | Type / filing |
|---|
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American Tower Corporation (AMT) insider buying and selling: 3 purchases, 11 sales
57 Form 4 Table I transactions filed with the SEC by American Tower Corporation insiders between 2025-10-03 and 2026-10-05 (15-month history): 3 open-market purchases and 11 sales, plus 43 transactions under other Form 4 codes, broken down one by one below. The largest open-market trade is a sale of $7.9M by Noel Eugene M on 2026-03-02.
American Tower insider buying and selling over the last 12 months
Between Oct 21, 2025 and Oct 20, 2026, American Tower insiders filed 3 purchases worth $2.0M and 11 sales worth $23.2M on the open market. The net balance is on the sell side: $21.2M more sold than bought.
The biggest buyer was Kalathur Rajesh (Director): $996k in 2 purchases, out of 2 different buyers. The biggest seller was Noel Eugene M (EVP & Chief Operating Officer): $7.9M in 1 sale, out of 5 different sellers.
The largest trade of the period was a sale of $7.9M on Mar 2, 2026, by Noel Eugene M (EVP & Chief Operating Officer), under a 10b5-1 plan. Form 4 on sec.gov (0002000070-26-000002).
Of the 11 sales, 9 (82%, $21.5M) carry the 10b5-1 plan flag on the Form 4, meaning they were scheduled months ahead; the other 2 do not.
The last three months show 1 purchase and 3 sales, against 0 and 2 in the three before. The latest purchase is from Aug 21, 2026; the latest sale from Jul 29, 2026.
Against its sector (Real Estate, 30 companies with an insider page on this site), over the same dates the median is 3.5 sales and 0 purchases on the open market. American Tower has more sales than 22 of the other 29, ranks 5 of 30 by net dollars sold, and 10 of the 30 have at least one purchase, American Tower included.
The 20 most important trades
The 3 open-market purchases first, then the rest, each type from largest to smallest. The full history is in the tool above, already searched.
See all 57 AMT trades in the full history →
| Trade date | Filed | Insider | Role | Amount | Code | Filing |
|---|---|---|---|---|---|---|
| 2025-10-31 | 2025-11-04 | Reilly Eugene F | Director | $994k | P — Open-market purchase | SEC |
| 2026-08-21 | 2026-08-25 | Kalathur Rajesh | Director | $501k | P — Open-market purchase | SEC |
| 2026-03-10 | 2026-03-12 | Kalathur Rajesh | Director | $495k | P — Open-market purchase | SEC |
| 2026-03-02 | 2026-03-04 | Noel Eugene M | EVP & Chief Operating Officer | $7.9M | S — Open-market sale (scheduled 10b5-1)5 Form 4 footnotesF2 The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2025. F3 Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $188.82 to $189.78 per share. F4 Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $189.92 to $190.88 per share. F5 Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $190.92 to $191.91 per share. F6 Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $191.92 to $192.19 per share. | SEC |
| 2026-02-17 | 2026-02-19 | Smith Rodney M | EVP, CFO & Treasurer | $6.6M | S — Open-market sale (scheduled 10b5-1)4 Form 4 footnotesF2 The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 22, 2025. F3 Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $189.93 to $190.88 per share. F4 Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $191.06 to $192.00 per share. F5 Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $192.13 to $193.00 per share. | SEC |
| 2026-03-04 | 2026-03-06 | Vondran Steven O | President and CEO | $6.3M | S — Open-market sale (scheduled 10b5-1)4 Form 4 footnotesF1 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. F2 Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $187.31 to $188.30 per share. F3 Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $188.31 to $189.30 per share. F4 Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $189.58 to $190.09 per share. | SEC |
| 2026-07-29 | 2026-07-31 | Meyer Robert Joseph | SVP & Advisor to the CFO | $894k | S — Open-market saleForm 4 footnoteF1 Includes 142 shares acquired under the issuer's employee stock purchase plan in May 2026. | SEC |
| 2026-02-27 | 2026-03-03 | Meyer Robert Joseph | SVP & Chief Accounting Officer | $832k | S — Open-market saleForm 4 footnoteF1 Includes 121 shares acquired under the issuer's employee stock purchase plan in May 2025. | SEC |
| 2026-07-29 | 2026-07-30 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | $194k | S — Open-market sale (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-03-04 | 2026-03-06 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | $129k | S — Open-market sale (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-02-27 | 2026-03-03 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | $122k | S — Open-market sale (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-07-28 | 2026-07-30 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | $116k | S — Open-market sale (scheduled 10b5-1)2 Form 4 footnotesF1 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. | SEC |
| 2026-04-28 | 2026-04-30 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | $99k | S — Open-market sale (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-04-29 | 2026-04-30 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | $74k | S — Open-market sale (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-03-02 | 2026-03-04 | Noel Eugene M | EVP & Chief Operating Officer | $3.9M | M — Option exercise (scheduled 10b5-1)Form 4 footnoteF1 Includes 73 and 46 shares acquired under the issuer's employee stock purchase plan in May 2025 and November 2025, respectively. | SEC |
| 2026-02-17 | 2026-02-19 | Smith Rodney M | EVP, CFO & Treasurer | $3.3M | M — Option exercise (scheduled 10b5-1)Form 4 footnoteF1 Includes 93 and 26 shares acquired under the issuer's employee stock purchase plan in May 2025 and in November 2025, respectively. | SEC |
| 2026-03-04 | 2026-03-06 | Vondran Steven O | President and CEO | $3.2M | M — Option exercise (scheduled 10b5-1) | SEC |
| 2026-03-10 | 2026-03-12 | Vondran Steven O | President and CEO | $2.8M | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF2 Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs and performance-based restricted stock units previously granted under the Plan. | SEC |
| 2026-03-10 | 2026-03-12 | Smith Rodney M | EVP, CFO & Treasurer | $2.3M | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF2 Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs and performance-based restricted stock units previously granted under the Plan. | SEC |
| 2026-03-10 | 2026-03-12 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | $1.2M | F — Tax withholding (shares surrendered for taxes)Form 4 footnoteF2 Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs and performance-based restricted stock units previously granted under the Plan. | SEC |
The period balance: money in, money out
Across the Form 4 filings submitted between Oct 3, 2025 and Oct 5, 2026, American Tower Corporation open-market activity adds up to 3 purchases worth $2.0M and 11 sales worth $23.2M. The net balance is $21.2M on the sell side.
Only codes P and S count, where an insider puts in or takes out their own money. A selling balance like American Tower Corporation's is the norm in the S&P 500, where much of the pay comes as stock. It is not a recommendation to buy or sell: it is what was filed.
Every transaction, code by code
| Code | What it means | Trades | Reported amount |
|---|---|---|---|
| A | Grant or award | 22 | $0 |
| F | Tax withholding (shares surrendered for taxes) | 17 | $9.2M |
| S | Open-market sale | 11 | $23.2M |
| M | Option exercise | 3 | $10.3M |
| P | Open-market purchase | 3 | $2.0M |
| G | Gift | 1 | $0 |
| Total | Everything filed in the period | 57 | $44.7M |
23 of the 57 rows carry no usable amount on the Form 4: they count as trades and add $0. The code labels come from the SEC index.
Who has traded
Over the 15 months of history, 19 distinct people or entities have filed American Tower Corporation transactions: 2 bought on the open market and 5 sold. Counted by CIK, the fixed number the SEC gives each filer, and not by name, which each filer types their own way.
| Filer | Role | Transactions | Bought (count) | Sold (count) | Last filed |
|---|---|---|---|---|---|
| Noel Eugene M | EVP & Chief Operating Officer | 5 | — | $7.9M (1) | 2026-03-12 |
| Smith Rodney M | EVP, CFO & Treasurer | 6 | — | $6.6M (1) | 2026-03-12 |
| Vondran Steven O | President and CEO | 6 | — | $6.3M (1) | 2026-03-12 |
| Meyer Robert Joseph | SVP & Advisor to the CFO | 6 | — | $1.7M (2) | 2026-07-31 |
| Kalathur Rajesh | Director | 3 | $996k (2) | — | 2026-08-25 |
| Reilly Eugene F | Director | 2 | $994k (1) | — | 2026-03-12 |
| Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | 11 | — | $733k (6) | 2026-07-30 |
| Font Juan | SVP, Pres. & CEO, CoreSite | 4 | — | — | 2026-03-12 |
Shown here are the 8 who moved the most money, out of 19. The rest are in the full history, one link above. The name links to all their trades, in any company. "Transactions" counts any code; the money, open market only. Role: from their latest filing.
Month by month
By the month the trade was executed, not the month it was filed; months with no trades show zero. The busiest month was Mar 2026: 1 purchase and 3 sales, worth $14.8M. 9 of the 15 months have none.
| Month | Purchases | Amount | Sales | Amount |
|---|---|---|---|---|
| Aug 2025 | 0 | $0 | 0 | $0 |
| Sep 2025 | 0 | $0 | 0 | $0 |
| Oct 2025 | 1 | $994k | 0 | $0 |
| Nov 2025 | 0 | $0 | 0 | $0 |
| Dec 2025 | 0 | $0 | 0 | $0 |
| Jan 2026 | 0 | $0 | 0 | $0 |
| Feb 2026 | 0 | $0 | 3 | $7.6M |
| Mar 2026 | 1 | $495k | 3 | $14.3M |
| Apr 2026 | 0 | $0 | 2 | $173k |
| May 2026 | 0 | $0 | 0 | $0 |
| Jun 2026 | 0 | $0 | 0 | $0 |
| Jul 2026 | 0 | $0 | 3 | $1.2M |
| Aug 2026 | 1 | $501k | 0 | $0 |
| Sep 2026 | 0 | $0 | 0 | $0 |
| Oct 2026 | 0 | $0 | 0 | $0 |
The last month may be partial: a Form 4 is filed up to two business days later. The table does not say whether the pattern is good or bad; it says when it happened.
American Tower Corporation (AMT) analysis page →
Other Real Estate companies with insider trades
All 500 are listed in the section index →
Which insiders are buying their own company stock →
How to read this data
9 of the 11 sales in the table are flagged as scheduled (10b5-1 plan): signed months ahead and executed automatically, so they say nothing about what the insider thinks today. American Tower's 3 open-market purchases (code P) are the rare signal: insiders are already paid in stock, so buying more means putting in their own money. The latest filing is from Oct 5, 2026, and a Form 4 arrives up to two business days after the trade.
16 of the 20 rows in the table carry footnotes from the Form 4 itself, folded into the code column and copied verbatim; a row with no footnote means the filing has none.
Guide: Insider buying · all guides
What is behind these trades
The concepts on this page, explained from scratch in the Academy. Free, no account.
- What the efficiency hypothesis says and what it does NOT sayIf an insider's purchase is public and anyone can read it, is there any information left in it? That is the exact question that brings people here.
- Who really moves the market: the types of investorWho sits on the other side of each order, and where a company's own insiders fit among them.
- Supply, demand and price: why it rises and falls constantlyHow a piece of news ends up inside the price, and why the reaction to a filed sale is rarely the one you would expect.
Source: SEC EDGAR Form 4. This is a list of public facts, not financial advice or a recommendation to buy or sell.