$AMT

$186.39 -$1.90 (1.01%) Live

$AMT Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 466.0M shares outstanding

Who owns AMT?

By type of holder

Institutions 94.0% Insiders 0.1% Everyone else 5.9%

Concentration Top 10 holders own 41.2%

BlackRock, Inc. 9.8% · Vanguard Capital Management LLC 6.5%

Institutional ownership

94.0%

+1.6 pts vs last qtr

Institutional holders

1,742

-11 vs last qtr

Net shares bought

+7.4M

by institutions in Q2 2026

New / sold out

173 / 184

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Norges Bank NEW +6.4M
Aqr Capital Management LLC +1.9M

Biggest sellers in Q2 2026

Jpmorgan Chase & Co −6.3M
Cantillon Capital Management LLC SOLD OUT −1.6M

Who is planning to sell?

Notices of proposed sale, last 12 months

$26.5M

8 notices from 6 people

Shares covered

140.3K

0.03% of the company

Arranged in advance

81%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Eugene Noel Officer 10b5-1 $7.87M
Rodney Smith Officer 10b5-1 $6.6M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

+9.2%

+0.98% a year

Each share's claim on the business

−8.4%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$1.46B vs $1.43B

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years86% 3–5 years2% 1–3 years6% Under 1 year7%

Quarterly turnover

7.8%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting AMT on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	45.8M	9.83%	+842.4K (+1.9%)	≤2021	0.1%
Shares held by quarter Peak holding45.8M (Q2'26) Change over 8 quarters+6.9M Share of the company9.830% BlackRock, Inc.'s full portfolio →
VC Vanguard Capital Management LLC	30.4M	6.53%	+75.4K (+0.2%)	≤2021	0.1%
Shares held by quarter Peak holding30.4M (Q2'26) Change over 8 quarters+30.4M Share of the company6.530% Vanguard Capital Management LLC's full portfolio →

BlackRock, Inc.

45.8M

% of company

9.83%

Change vs last qtr

+842.4K (+1.9%)

Held since

≤2021

Vanguard Capital Management LLC

30.4M

% of company

6.53%

Change vs last qtr

+75.4K (+0.2%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding American Tower Corporation, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting AMT on Form N-PORT; together they hold 38.3% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VR Vanguard Real Estate Index Fund Vanguard Specialized Funds	$3.07B	17.7M	3.81%	4.20%	July 31, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$2.42B	14.8M	3.17%	0.11%	June 30, 2026

Vanguard Real Estate Index Fund

Vanguard Specialized Funds

Position value

$3.07B

% of company

3.81%

% of the fund

4.20%

As of

July 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$2.42B

% of company

3.17%

% of the fund

0.11%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding American Tower Corporation and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
VS Vondran Steven O Insider	108.9K	0.02%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.020% Vondran Steven O's insider activity →
SR Smith Rodney M Insider	92.5K	0.02%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.020% Smith Rodney M's insider activity →

Vondran Steven O

Insider

108.9K

% of company

0.02%

Change vs last qtr

—

Held since

—

Smith Rodney M

Insider

92.5K

% of company

0.02%

Change vs last qtr

—

Held since

—

20 more holders behind a free account

See every insider and 5%+ holder of American Tower Corporation.

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