Comparable stake leader
BlackRock, Inc.
SEC ownership of AMERICAN TOWER CORP /MA/
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001053507.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
29 Jul 2026
- Public ticker
- AMT on NYSE
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
29 Jul 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001053507
- Issuer location
- Boston, MA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of AMERICAN TOWER CORP /MA/ (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
29 Jul 2026
13D/G
13F
3/4/5
Lead comparable stake: 9.2%
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 9.2%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
9.2%
VANGUARD CAPITAL MANAGEMENT LLC
7.6%
VANGUARD PORTFOLIO MANAGEMENT LLC
5.9%
Vondran Steven O
0.02%
Rodney M. Smith
0.02%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13D/G
13F
Company
|
9.2%
|
$9,096,034,371
43,047,962 shares
|
$0 | 31 Dec 2024 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
7.6%
|
$6,082,733,798
35,245,879 shares
|
$0 | 31 Mar 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
13F
Vanguard Portfolio Management · Company
|
5.9%
|
$4,783,737,772
27,718,958 shares
|
$0 | 31 Mar 2026 |
| Vondran Steven O |
3/4/5
President and CEO, Director
|
0.02%
|
$20,494,267
108,902 shares
|
-$6,309,967 | 10 Mar 2026 |
| Rodney M. Smith |
3/4/5
EVP, CFO & Treasurer
|
0.02%
|
$17,415,478
92,542 shares
|
-$6,596,528 | 10 Mar 2026 |
| Joann A. Reed |
3/4/5
Former Director
|
0.01%
|
$13,299,222
62,940 shares
|
— | 14 May 2025 |
| Olivier Puech |
3/4/5
Former Officer
|
0.01%
|
$6,696,972
38,144 shares
|
— | 02 Jan 2026 |
| Eugene M. Noel |
3/4/5
EVP & Chief Operating Officer
|
0.01%
|
$6,500,458
34,542 shares
|
-$7,872,920 | 10 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$21,749,930.
Buys
$1,489,047
Insiders: 2
Sells
$23,238,977
Insiders: 5
Net
-$21,749,930
Shares: -114,362
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 8,225
Shares: 122,587
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 6,791 | $0 | $1,204,091 | -$1,204,091 |
| 3-6 | 2,671 | 115,796 | $494,936 | $22,034,886 | -$21,539,950 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 5,554 | 0 | $994,110 | $0 | +$994,110 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 29 reporting-owner rows connected to AMERICAN TOWER CORP /MA/. Open a relationship link for the CIK-to-CIK filing trail.
Rows
29
Largest Forms 3/4/5 holder
Amit Sharma
Net 12M change
-$21,749,931
Latest report
29 Jul 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Amit Sharma | Former Officer | $66,773,588 | Mixed | 01 Jul 2021 | ||
| Thomas A. Bartlett | Former Officer | $50,696,138 | Mixed | 01 May 2024 | ||
| Edmund DiSanto | Former Officer | $37,936,577 | Mixed | 01 Jul 2023 | ||
| Vondran Steven O | President and CEO, Director | $20,494,267 | -$6,309,967 | -24% | Mixed | 10 Mar 2026 |
| Rodney M. Smith | EVP, CFO & Treasurer | $17,415,478 | -$6,596,528 | -27% | Mixed | 10 Mar 2026 |
| Joann A. Reed | Former Director | $13,299,222 | Mixed | 14 May 2025 | ||
| Olivier Puech | Former Officer | $6,696,972 | Mixed | 02 Jan 2026 | ||
| Eugene M. Noel | EVP & Chief Operating Officer | $6,500,458 | -$7,872,920 | -55% | Mixed | 10 Mar 2026 |
| Sanjay Goel | Former Officer | $5,486,095 | Mixed | 31 Mar 2025 | ||
| Juan Font | SVP, Pres. & CEO, CoreSite | $5,335,562 | Mixed | 10 Mar 2026 | ||
| Dowling Ruth T. | EVP, Chief Admin Ofr, GC & Sec | $4,848,316 | -$733,417 | -13% | Filing P/S | 28 Jul 2026 |
| Samme L. Thompson | Former Director | $4,451,710 | Mixed | 22 May 2024 | ||
| Robert Joseph Meyer | SVP & Advisor to the CFO | $3,833,254 | -$1,726,145 | -31% | Filing P/S | 29 Jul 2026 |
| Pamela D. A. Reeve | Director | $3,639,539 | Mixed | 28 May 2026 | ||
| Raymond P. Dolan | Former Director | $3,602,839 | Mixed | 22 May 2024 | ||
| Richard C. Rossi | EVP & President, U.S. Tower | $3,296,712 | Mixed | 10 Mar 2026 | ||
| Craig Macnab | Director | $2,882,129 | Mixed | 10 Mar 2026 | ||
| Gustavo Lara | Former Director | $2,300,132 | Mixed | 18 May 2022 | ||
| Grace Lieblein | Director | $1,720,244 | Mixed | 10 Mar 2026 | ||
| Robert D. Hormats | Former Director | $1,656,250 | Mixed | 20 May 2026 |
Recent insider transactions for AMERICAN TOWER CORP /MA/
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Robert Joseph Meyer | AMT | Common Stock | Sale | -18.9% | $894,450 | $178.89 | -5,000 | 21,428 | 29 Jul 2026 | Direct |
| Dowling Ruth T. | AMT | Common Stock | Sale | -3.84% | $193,506 | $174.96 | -1,106 | 27,711 | 29 Jul 2026 | Direct |
| Dowling Ruth T. | AMT | Common Stock | Sale | -2.32% | $116,135 | $169.54 | -685 | 28,817 | 28 Jul 2026 | Direct |
| Robert Joseph Meyer | AMT | Common Stock | Tax liability | -0.58% | -153 | 26,286 | 01 Jun 2026 | Direct | ||
| Pamela D. A. Reeve | AMT | Common Stock | Gift | -3.7% | -810 | 21,089 | 28 May 2026 | Direct | ||
| Dowling Ruth T. | AMT | Common Stock | Sale | -1.39% | $73,857 | $177.54 | -416 | 29,461 | 29 Apr 2026 | Direct |
| Dowling Ruth T. | AMT | Common Stock | Sale | -1.83% | $99,235 | $178.48 | -556 | 29,877 | 28 Apr 2026 | Direct |
| Richard C. Rossi | AMT | Common Stock | Tax liability | -3.76% | -684 | 17,518 | 11 Mar 2026 | Direct | ||
| Juan Font | AMT | Common Stock | Tax liability | -3.17% | -928 | 28,352 | 11 Mar 2026 | Direct | ||
| Rodney M. Smith | AMT | Common Stock | Tax liability | -1.38% | -1,295 | 92,542 | 11 Mar 2026 | Direct | ||
| Robert Joseph Meyer | AMT | Common Stock | Tax liability | -2.52% | -684 | 26,439 | 11 Mar 2026 | Direct | ||
| Dowling Ruth T. | AMT | Common Stock | Tax liability | -2.76% | -863 | 30,433 | 11 Mar 2026 | Direct | ||
| Eugene M. Noel | AMT | Common Stock | Tax liability | -2.04% | -719 | 34,542 | 11 Mar 2026 | Direct | ||
| Vondran Steven O | AMT | Common Stock | Tax liability | -1.94% | -2,158 | 108,902 | 11 Mar 2026 | Direct | ||
| Richard C. Rossi | AMT | Common Stock | Tax liability | -7.82% | -1,544 | 18,202 | 10 Mar 2026 | Direct | ||
| Richard C. Rossi | AMT | Common Stock | Award | 48.5% | 6,448 | 19,746 | 10 Mar 2026 | Direct | ||
| Juan Font | AMT | Common Stock | Tax liability | -5.89% | -1,834 | 29,280 | 10 Mar 2026 | Direct | ||
| Juan Font | AMT | Common Stock | Award | 35% | 8,060 | 31,114 | 10 Mar 2026 | Direct | ||
| Rodney M. Smith | AMT | Common Stock | Tax liability | -11.7% | -12,433 | 93,837 | 10 Mar 2026 | Direct | ||
| Rodney M. Smith | AMT | Common Stock | Award | 11% | 10,531 | 106,270 | 10 Mar 2026 | Direct | ||
| Robert Joseph Meyer | AMT | Common Stock | Tax liability | -4.8% | -1,368 | 27,123 | 10 Mar 2026 | Direct | ||
| Robert Joseph Meyer | AMT | Common Stock | Award | 16.5% | 4,030 | 28,491 | 10 Mar 2026 | Direct | ||
| Dowling Ruth T. | AMT | Common Stock | Tax liability | -17.5% | -6,629 | 31,296 | 10 Mar 2026 | Direct | ||
| Dowling Ruth T. | AMT | Common Stock | Award | 22.2% | 6,878 | 37,925 | 10 Mar 2026 | Direct | ||
| Eugene M. Noel | AMT | Common Stock | Tax liability | -6.62% | -2,498 | 35,261 | 10 Mar 2026 | Direct | ||
| Eugene M. Noel | AMT | Common Stock | Award | 27.6% | 8,167 | 37,759 | 10 Mar 2026 | Direct | ||
| Vondran Steven O | AMT | Common Stock | Tax liability | -12.1% | -15,269 | 111,060 | 10 Mar 2026 | Direct | ||
| Vondran Steven O | AMT | Common Stock | Award | 19.9% | 20,955 | 126,329 | 10 Mar 2026 | Direct | ||
| Kelly C. Chambliss | AMT | Common Stock | Award | 37.6% | 1,209 | 4,426 | 10 Mar 2026 | Direct | ||
| Craig Macnab | AMT | Common Stock | Award | 8.57% | 1,209 | 15,315 | 10 Mar 2026 | Direct | ||
| Rajesh Kalathur | AMT | Common Stock | Purchase | 117.9% | $494,936 | $185.30 | 2,671 | 4,936 | 10 Mar 2026 | Direct |
| Rajesh Kalathur | AMT | Common Stock | Award | 114.5% | 1,209 | 2,265 | 10 Mar 2026 | Direct | ||
| Robert D. Hormats | AMT | Common Stock | Award | 14.4% | 1,209 | 9,597 | 10 Mar 2026 | Direct | ||
| Teresa Hillary Clarke | AMT | Common Stock | Award | 29.5% | 1,209 | 5,307 | 10 Mar 2026 | Direct | ||
| Pamela D. A. Reeve | AMT | Common Stock | Award | 5.84% | 1,209 | 21,899 | 10 Mar 2026 | Direct | ||
| Neville R. Ray | AMT | Common Stock | Award | 114.5% | 1,209 | 2,265 | 10 Mar 2026 | Direct | ||
| Eugene F. Reilly | AMT | Common Stock | Award | 21.2% | 1,209 | 6,898 | 10 Mar 2026 | Direct | ||
| Bruce L. Tanner | AMT | Common Stock | Award | 21.1% | 1,209 | 6,940 | 10 Mar 2026 | Direct | ||
| Grace Lieblein | AMT | Common Stock | Award | 15.2% | 1,209 | 9,141 | 10 Mar 2026 | Direct | ||
| Kenneth R. Frank | AMT | Common Stock | Award | 24.3% | 1,209 | 6,188 | 10 Mar 2026 | Direct | ||
| Vondran Steven O | AMT | Common Stock | Sale | -24.1% | $6,309,967 | $188.46 | -33,482 | 105,374 | 04 Mar 2026 | Direct |
| Vondran Steven O | AMT | Common Stock | Options Exercise | 31.8% | 33,482 | 138,856 | 04 Mar 2026 | Direct | ||
| Vondran Steven O | AMT | Option to Purchase Common Stock | Options Exercise | -100% | -33,482 | 0 | 04 Mar 2026 | Direct | ||
| Dowling Ruth T. | AMT | Common Stock | Sale | -2.15% | $128,564 | $188.51 | -682 | 31,047 | 04 Mar 2026 | Direct |
| Eugene M. Noel | AMT | Common Stock | Sale | -58.2% | $7,872,920 | $191.05 | -41,209 | 29,592 | 02 Mar 2026 | Direct |
| Eugene M. Noel | AMT | Common Stock | Options Exercise | 139.3% | 41,209 | 70,801 | 02 Mar 2026 | Direct | ||
| Eugene M. Noel | AMT | Option to Purchase Common Stock | Options Exercise | -100% | -41,209 | 0 | 02 Mar 2026 | Direct | ||
| Dowling Ruth T. | AMT | Common Stock | Sale | -2.03% | $122,121 | $186.16 | -656 | 31,729 | 27 Feb 2026 | Direct |
| Robert Joseph Meyer | AMT | Common Stock | Sale | -15.4% | $831,695 | $186.73 | -4,454 | 24,461 | 27 Feb 2026 | Direct |
| Dowling Ruth T. | AMT | Common Stock | Award | 52% | 11,083 | 32,385 | 25 Feb 2026 | Direct |
* marks a reported price that did not pass the local price check.