Company / CIK 0001053507
AMERICAN TOWER CORP /MA/
- Ticker
- AMT
- Size, estimated from filings
- Large cap ($10B – $200B)
- Insiders on file
- 20
- Members of Congress who traded it
- 3
- Federal contracts on record
- none matched
- Lobbying filings on record
- none matched
- SEC filings
- EDGAR ↗
- Latest trade on record
- October 1, 2026
AMERICAN TOWER CORP /MA/ (AMT) has 20 insiders on file who disclosed 67 transactions in the last 12 months (3 open-market buys, 35 sales, about $44.7M at reported prices), and 3 congressional trades in its stock are on record. No federal contract award that started in the last 180 days was found for a recipient with exactly this name; no lobbying filing names it as client this year.
AMERICAN TOWER CORP /MA/ in charts
Who is trading this stock
Which people account for the buying and selling over the last 12 months?
BoughtSold
8 people account for the disclosed buying and selling in AMERICAN TOWER CORP /MA/ over the last 12 months; the most active is Vondran Steven O with $9.5M.
Insiders
| Name | Role | Rows | Bought | Sold | Last filed |
|---|---|---|---|---|---|
| MACNAB CRAIG | Director | 1 | 0 | 0 | October 5, 2026 |
| Blanchett Paul | SVP & Chief Accounting Officer | 1 | 0 | 0 | October 5, 2026 |
| Kalathur Rajesh | Director | 3 | 2 | 0 | August 25, 2026 |
| Meyer Robert Joseph | SVP & Chief Accounting Officer | 6 | 0 | 5 | July 31, 2026 |
| Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | 11 | 0 | 9 | July 30, 2026 |
| REEVE PAMELA D A | Director | 2 | 0 | 0 | June 1, 2026 |
| Lieblein Grace | Director | 1 | 0 | 0 | May 26, 2026 |
| HORMATS ROBERT D | Director | 1 | 0 | 0 | May 20, 2026 |
| Clarke Teresa Hillary | Director | 1 | 0 | 0 | May 13, 2026 |
| Font Juan | SVP, Pres. & CEO, CoreSite | 4 | 0 | 3 | March 12, 2026 |
| Smith Rodney M | EVP, CFO & Treasurer | 10 | 0 | 6 | March 12, 2026 |
| Vondran Steven O | President and CEO | 9 | 0 | 5 | March 12, 2026 |
| Noel Eugene M | EVP & Chief Operating Officer | 9 | 0 | 6 | March 12, 2026 |
| Frank Kenneth R | Director | 1 | 0 | 0 | March 12, 2026 |
| Tanner Bruce L | Director | 1 | 0 | 0 | March 12, 2026 |
| REILLY EUGENE F | Director | 2 | 1 | 0 | March 12, 2026 |
| Ray Neville R | Director | 1 | 0 | 0 | March 12, 2026 |
| Chambliss Kelly C | Director | 1 | 0 | 0 | March 12, 2026 |
| Rossi Richard C | EVP & President, U.S. Tower | 3 | 0 | 2 | March 12, 2026 |
| Puech Olivier | Insider | 0 | 0 | 0 | January 6, 2026 |
Rows are this company's Form 4 rows for each person. "Bought" and "sold" count open-market purchases (code P) and sales only. More in insider buying and insider selling.
Members of Congress who traded AMT
From periodic transaction reports that name the company's stock. Amounts are the sums of the ranges as filed. Every row is on the AMT page.
| Member | Seat | Trades | Bought | Sold | Range as filed | Latest |
|---|---|---|---|---|---|---|
| Dwight Evans | Representative (PA, District 3), Democrat | 1 | 0 | 1 | $1,001–$15K | May 11, 2026 |
| Richard McCormick | Representative (GA, District 7), Republican | 1 | 0 | 1 | $1,001–$15K | April 17, 2026 |
| Alan Armstrong | Senator (OK), Republican | 1 | 0 | 1 | $1,001–$15K | March 27, 2026 |
Insider transactions
| Filer | Security | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Blanchett Paul | AMT | Other A | October 1, 2026 | October 5, 2026 | 4d | 16,299 | — | — | Form 4 ↗ | ||
| Kalathur Rajesh | AMT | Buy P | August 21, 2026 | August 25, 2026 | 4d | 2,829 | $177 | $501K | Form 4 ↗ | ||
| Meyer Robert Joseph | AMT | Sell S | July 29, 2026 | July 31, 2026 | 2d | 5,000 | $179 | $894K | Form 4 ↗ | ||
| Dowling Ruth T | AMT | Sell S | July 29, 2026 | July 30, 2026 | 1d | 1,106 | $175 | $194K | 10b5-1 plan | Form 4 ↗ | |
| Dowling Ruth T | AMT | Sell S | July 28, 2026 | July 30, 2026 | 2d | 685 | $170 | $116K | 10b5-1 plan | Form 4 ↗ | |
| Meyer Robert Joseph | AMT | Sell F | June 1, 2026 | June 3, 2026 | 2d | 153 | $188 | $29K | Form 4 ↗ | ||
| REEVE PAMELA D A | AMT | Other G | May 28, 2026 | June 1, 2026 | 4d | 810 | — | — | Form 4 ↗ | ||
| Dowling Ruth T | AMT | Sell S | April 29, 2026 | April 30, 2026 | 1d | 416 | $178 | $74K | 10b5-1 plan | Form 4 ↗ | |
| Dowling Ruth T | AMT | Sell S | April 28, 2026 | April 30, 2026 | 2d | 556 | $178 | $99K | 10b5-1 plan | Form 4 ↗ | |
| Rossi Richard C | AMT | Sell F | March 11, 2026 | March 12, 2026 | 1d | 684 | $183 | $125K | Form 4 ↗ | ||
| Rossi Richard C | AMT | Sell F | March 10, 2026 | March 12, 2026 | 2d | 1,544 | $186 | $287K | Form 4 ↗ | ||
| Rossi Richard C | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 6,448 | — | — | Form 4 ↗ | ||
| Font Juan | AMT | Sell F | March 11, 2026 | March 12, 2026 | 1d | 928 | $183 | $170K | Form 4 ↗ | ||
| Font Juan | AMT | Sell F | March 10, 2026 | March 12, 2026 | 2d | 1,834 | $186 | $341K | Form 4 ↗ | ||
| Font Juan | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 8,060 | — | — | Form 4 ↗ | ||
| Smith Rodney M | AMT | Sell F | March 11, 2026 | March 12, 2026 | 1d | 1,295 | $183 | $237K | Form 4 ↗ | ||
| Smith Rodney M | AMT | Sell F | March 10, 2026 | March 12, 2026 | 2d | 12,433 | $186 | $2.3M | Form 4 ↗ | ||
| Smith Rodney M | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 10,531 | — | — | Form 4 ↗ | ||
| Meyer Robert Joseph | AMT | Sell F | March 11, 2026 | March 12, 2026 | 1d | 684 | $183 | $125K | Form 4 ↗ | ||
| Meyer Robert Joseph | AMT | Sell F | March 10, 2026 | March 12, 2026 | 2d | 1,368 | $186 | $255K | Form 4 ↗ | ||
| Meyer Robert Joseph | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 4,030 | — | — | Form 4 ↗ | ||
| Dowling Ruth T | AMT | Sell F | March 11, 2026 | March 12, 2026 | 1d | 863 | $183 | $158K | Form 4 ↗ | ||
| Dowling Ruth T | AMT | Sell F | March 10, 2026 | March 12, 2026 | 2d | 6,629 | $186 | $1.2M | Form 4 ↗ | ||
| Dowling Ruth T | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 6,878 | — | — | Form 4 ↗ | ||
| Noel Eugene M | AMT | Sell F | March 11, 2026 | March 12, 2026 | 1d | 719 | $183 | $131K | Form 4 ↗ | ||
| Noel Eugene M | AMT | Sell F | March 10, 2026 | March 12, 2026 | 2d | 2,498 | $186 | $465K | Form 4 ↗ | ||
| Noel Eugene M | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 8,167 | — | — | Form 4 ↗ | ||
| Vondran Steven O | AMT | Sell F | March 11, 2026 | March 12, 2026 | 1d | 2,158 | $183 | $395K | Form 4 ↗ | ||
| Vondran Steven O | AMT | Sell F | March 10, 2026 | March 12, 2026 | 2d | 15,269 | $186 | $2.8M | Form 4 ↗ | ||
| Vondran Steven O | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 20,955 | — | — | Form 4 ↗ | ||
| Chambliss Kelly C | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 1,209 | — | — | Form 4 ↗ | ||
| MACNAB CRAIG | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 1,209 | — | — | Form 4 ↗ | ||
| Kalathur Rajesh | AMT | Buy P | March 10, 2026 | March 12, 2026 | 2d | 2,671 | $185 | $495K | Form 4 ↗ | ||
| Kalathur Rajesh | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 1,209 | — | — | Form 4 ↗ | ||
| HORMATS ROBERT D | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 1,209 | — | — | Form 4 ↗ | ||
| Clarke Teresa Hillary | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 1,209 | — | — | Form 4 ↗ | ||
| REEVE PAMELA D A | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 1,209 | — | — | Form 4 ↗ | ||
| Ray Neville R | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 1,209 | — | — | Form 4 ↗ | ||
| REILLY EUGENE F | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 1,209 | — | — | Form 4 ↗ | ||
| Tanner Bruce L | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 1,209 | — | — | Form 4 ↗ | ||
| Lieblein Grace | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 1,209 | — | — | Form 4 ↗ | ||
| Frank Kenneth R | AMT | Other A | March 10, 2026 | March 12, 2026 | 2d | 1,209 | — | — | Form 4 ↗ | ||
| Vondran Steven O | AMT | Option / conversion M | March 4, 2026 | March 6, 2026 | 2d | 33,482 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| Vondran Steven O | AMT | Sell S | March 4, 2026 | March 6, 2026 | 2d | 1,773 | $190 | $337K | 10b5-1 plan | Form 4 ↗ | |
| Vondran Steven O | AMT | Sell S | March 4, 2026 | March 6, 2026 | 2d | 16,625 | $189 | $3.1M | 10b5-1 plan | Form 4 ↗ | |
| Vondran Steven O | AMT | Sell S | March 4, 2026 | March 6, 2026 | 2d | 15,084 | $188 | $2.8M | 10b5-1 plan | Form 4 ↗ | |
| Vondran Steven O | AMT | Option / conversion M | March 4, 2026 | March 6, 2026 | 2d | 33,482 | $95 | $3.2M | 10b5-1 plan | Form 4 ↗ | |
| Dowling Ruth T | AMT | Sell S | March 4, 2026 | March 6, 2026 | 2d | 682 | $189 | $129K | 10b5-1 plan | Form 4 ↗ | |
| Noel Eugene M | AMT | Option / conversion M | March 2, 2026 | March 4, 2026 | 2d | 41,209 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| Noel Eugene M | AMT | Sell S | March 2, 2026 | March 4, 2026 | 2d | 6,985 | $192 | $1.3M | 10b5-1 plan | Form 4 ↗ | |
| Noel Eugene M | AMT | Sell S | March 2, 2026 | March 4, 2026 | 2d | 21,604 | $191 | $4.1M | 10b5-1 plan | Form 4 ↗ | |
| Noel Eugene M | AMT | Sell S | March 2, 2026 | March 4, 2026 | 2d | 7,378 | $190 | $1.4M | 10b5-1 plan | Form 4 ↗ | |
| Noel Eugene M | AMT | Sell S | March 2, 2026 | March 4, 2026 | 2d | 5,242 | $189 | $993K | 10b5-1 plan | Form 4 ↗ | |
| Noel Eugene M | AMT | Option / conversion M | March 2, 2026 | March 4, 2026 | 2d | 41,209 | $95 | $3.9M | 10b5-1 plan | Form 4 ↗ | |
| Meyer Robert Joseph | AMT | Sell S | February 27, 2026 | March 3, 2026 | 4d | 4,454 | $187 | $832K | Form 4 ↗ | ||
| Dowling Ruth T | AMT | Sell S | February 27, 2026 | March 3, 2026 | 4d | 656 | $186 | $122K | 10b5-1 plan | Form 4 ↗ | |
| Dowling Ruth T | AMT | Other A | February 25, 2026 | February 27, 2026 | 2d | 11,083 | — | — | Form 4 ↗ | ||
| Smith Rodney M | AMT | Other A | February 25, 2026 | February 27, 2026 | 2d | 21,425 | — | — | Form 4 ↗ | ||
| Vondran Steven O | AMT | Other A | February 25, 2026 | February 27, 2026 | 2d | 24,626 | — | — | Form 4 ↗ | ||
| Smith Rodney M | AMT | Option / conversion M | February 17, 2026 | February 19, 2026 | 2d | 34,341 | — | — | 10b5-1 planderivative | Form 4 ↗ | |
| Smith Rodney M | AMT | Sell S | February 17, 2026 | February 19, 2026 | 2d | 1 | $193 | $193 | 10b5-1 plan | Form 4 ↗ | |
| Smith Rodney M | AMT | Sell S | February 17, 2026 | February 19, 2026 | 2d | 22,658 | $192 | $4.4M | 10b5-1 plan | Form 4 ↗ | |
| Smith Rodney M | AMT | Sell S | February 17, 2026 | February 19, 2026 | 2d | 9,596 | $192 | $1.8M | 10b5-1 plan | Form 4 ↗ | |
| Smith Rodney M | AMT | Sell S | February 17, 2026 | February 19, 2026 | 2d | 2,086 | $190 | $397K | 10b5-1 plan | Form 4 ↗ | |
| Smith Rodney M | AMT | Option / conversion M | February 17, 2026 | February 19, 2026 | 2d | 34,341 | $95 | $3.3M | 10b5-1 plan | Form 4 ↗ | |
| Font Juan | AMT | Sell F | January 3, 2026 | January 6, 2026 | 3d | 419 | $175 | $73K | Form 4 ↗ | ||
| REILLY EUGENE F | AMT | Buy P | October 31, 2025 | November 4, 2025 | 4d | 5,554 | $179 | $994K | Form 4 ↗ | ||
| Dowling Ruth T | AMT | Sell F | October 1, 2025 | October 3, 2025 | 2d | 55 | $193 | $11K | Form 4 ↗ |
Federal contracts (USAspending, awards started in the last 180 days)
No contract award starting in the last 180 days was found for a recipient named exactly "AMERICAN TOWER CORP /MA/". Subsidiaries and differently-spelled recipients are not matched — search contracts.
Lobbying (Senate LDA, as client)
No LDA filing posted since October 2025 names "AMERICAN TOWER CORP /MA/" as the client. Filings under a subsidiary or trade-association name are not matched — search lobbying.
Related companies
Companies whose stock was traded by the same people who traded AMT, by number of filers in common. It shows overlap in public filings and nothing else.
- MICROSOFT CORP MSFT 3 filers in common
- MICRON TECHNOLOGY INC MU 2 filers in common
- NVIDIA CORP NVDA 2 filers in common
- THERMO FISHER SCIENTIFIC INC. TMO 2 filers in common
- ANALOG DEVICES INC ADI 2 filers in common
- Walmart Inc. WMT 2 filers in common
- PROCTER & GAMBLE Co PG 2 filers in common
- JOHNSON & JOHNSON JNJ 2 filers in common
Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- What disclosure data cannot tell you Filings are late by design: up to 45 days for Congress, two business days for insiders.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| House Clerk, periodic transaction reports | 2 | 2 | May 12, 2026 | May 15, 2026 | House Clerk search |
| Senate eFD, periodic transaction reports | 1 | 1 | July 21, 2026 | July 21, 2026 | Senate eFD search |
| SEC EDGAR, Form 4 | 37 | 68 | October 3, 2025 | October 5, 2026 | Form 4 list on EDGAR |
Site built October 22, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Insiders and their transactions come from SEC EDGAR Form 4 filings for this issuer. Contracts and lobbying are matched by exact normalized name (suffixes like Inc./Corp. ignored) to USAspending recipients and LDA clients — a conservative match that misses subsidiaries on purpose. See methodology and corrections.
Not investment advice. Public records shown as filed; no recommendation is made or implied.