$ATO

$171.37 +$0.00 (0.0%) After hours

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

Ownership

13F as of Q2 2026 · 169.0M shares outstanding

Who owns ATO?

By type of holder

Institutions 96.3% Insiders 0.5% Everyone else 3.1%

Concentration Top 10 holders own 45.5%

BlackRock, Inc. 9.0% · State Street Corp 6.7%

Institutional ownership

96.3%

+1.6 pts vs last qtr

Institutional holders

1,042

+22 vs last qtr

Net shares bought

+2.7M

by institutions in Q2 2026

New / sold out

134 / 112

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Norges Bank NEW +2.1M
Qube Research & Technologies Ltd +2.1M

Biggest sellers in Q2 2026

Aristotle Capital Management, LLC −4.8M
Capital Research Global Investors −2.5M

Who is planning to sell?

Notices of proposed sale, last 12 months

$77.4K

1 notice from 1 person

Shares covered

452

0.00% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Sean Donohue Director $77.4K

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

+55.1%

+5.00% a year

Each share's claim on the business

−35.5%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $118M

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+ years70% 3–5 years11% 1–3 years11% Under 1 year8%

Quarterly turnover

10.4%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ATO on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	15.2M	9.02%	−2.2M (−12.7%)	≤2021	0.0%
Shares held by quarter Peak holding17.5M (Q1'26) Change over 8 quarters+1.7M Share of the company9.020% BlackRock, Inc.'s full portfolio →
SS State Street Corp	11.4M	6.73%	+7.3K (+0.1%)	≤2021	0.1%
Shares held by quarter Peak holding11.4M (Q2'26) Change over 8 quarters+579.5K Share of the company6.730% State Street Corp's full portfolio →

BlackRock, Inc.

15.2M

% of company

9.02%

Change vs last qtr

−2.2M (−12.7%)

Held since

≤2021

State Street Corp

11.4M

% of company

6.73%

Change vs last qtr

+7.3K (+0.1%)

Held since

≤2021

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting ATO on Form N-PORT; together they hold 45.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$913M	5.3M	3.14%	0.04%	June 30, 2026
V5 Vanguard 500 Index Fund Vanguard Index Funds	$745M	4.3M	2.56%	0.04%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$913M

% of company

3.14%

% of the fund

0.04%

As of

June 30, 2026

Vanguard 500 Index Fund

Vanguard Index Funds

Position value

$745M

% of company

2.56%

% of the fund

0.04%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Atmos Energy 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
CK Cocklin Kim R Insider	397.3K	0.24%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.240% Cocklin Kim R's insider activity →
AJ Akers John K Insider	149.2K	0.09%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.090% Akers John K's insider activity →

Cocklin Kim R

Insider

397.3K

% of company

0.24%

Change vs last qtr

—

Held since

—

Akers John K

Insider

149.2K

% of company

0.09%

Change vs last qtr

—

Held since

—

18 more holders behind a free account

See every insider and 5%+ holder of Atmos Energy Corporation.

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