Atmos Energy

ATO • NYSE

Atmos Energy is a regulated gas company in the utilities sector on NYSE, led by Michael E. Haefner, with a market cap of $27.6B. As of Q3 2025, 99% of shares are held by 877 institutional investors, with VANGUARD GROUP INC as the largest holder at 12.93%.

Chief Executive OfficerMichael E. Haefner

Market Cap$27.6B

Regulated Gas

Utilities

Employees5.0K

Websiteatmosenergy.com

Country

United States of America

Overview

Overview of institutional ownership in ATO as of Q3 2025 with a market cap of $27.4B

All Institutions

Institutions: 877
Value Held: $27.0B
Shares Held: 158.5M
Avg Position: $30.8M
Median Position: $844.4K

Hedge Funds

Hedge Funds: 35
Value Held: $377.1M
Shares Held: 2.2M
Avg Position: $10.8M
Median Position: $3.6M

Ownership Breakdown

Institutional (non-HF)

97.31%

$26.7B

Hedge Funds

1.38%

$377.1M

Retail & Other

1.32%

$361.5M

Based on market cap of $27.4B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in ATO as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
VANGUARD GROUP INC Institution	Salim Ramji CEO	$3.5B 0.05% of portfolio	12.93% 20.8M shares	≤ Q2 2013 Held for 12y 5m+	$6.69T
B BlackRock, Inc. Institution	-	$2.5B 0.04% of portfolio	9.07% 14.6M shares	≤ Q2 2013 Held for 12y 5m+	$5.67T
C Capital International Investors Institution	-	$1.9B 0.30% of portfolio	6.83% 11.0M shares	Q3 2024 Held for 1y 2m	$615.90B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$1.8B 0.06% of portfolio	6.62% 10.6M shares	≤ Q2 2013 Held for 12y 5m+	$2.88T
WELLINGTON MANAGEMENT CO LLP Long Only Manager	Edmund Wellington Iii President	$1.8B 0.31% of portfolio	6.52% 10.5M shares	Q3 2022 Held for 3y 2m	$571.21B
PRICE T ROWE ASSOCIATES INC /MD/ Long Only Manager	Robert W Sharps President	$1.3B 0.15% of portfolio	4.87% 7.8M shares	≤ Q2 2013 Held for 12y 5m+	$912.31B
Aristotle Capital Management, LLC Long Only Manager	Christopher Arthur Fisher CCO	$1.2B 2.60% of portfolio	4.51% 7.2M shares	Q1 2022 Held for 3y 8m	$47.4B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$703.4M 0.04% of portfolio	2.58% 4.1M shares	≤ Q2 2013 Held for 12y 5m+	$1.57T
BANK OF AMERICA CORP /DE/ Institution	Brian T. Moynihan CEO	$638.1M 0.05% of portfolio	2.33% 3.7M shares	≤ Q2 2013 Held for 12y 5m+	$1.33T
Invesco Ltd. ETF Provider	Brian Christopher Hartigan CEO	$529.2M 0.08% of portfolio	1.93% 3.1M shares	≤ Q2 2013 Held for 12y 5m+	$633.08B

Net Capital Flow

Institutional buying and selling activity for ATO in Q3 2025

Net Flow: +$27.0M
Buyers: 367
Sellers: 322
Total Bought: +$961.2M
Total Sold: −$934.2M
Avg Position: $31.7M

Biggest Buyers

Institution	Net Bought	Current Position
MORGAN STANLEY RIA/Wealth	+$69.7M +408.2K shares	$496.6M 2.9M shares
GOLDMAN SACHS GROUP INC Institution	+$61.9M +362.5K shares	$223.8M 1.3M shares
C Capital International Investors Institution	+$61.4M +359.8K shares	$1.9B 11.0M shares
STATE STREET CORP Institution	+$60.9M +356.9K shares	$1.8B 10.6M shares
C CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Institution	+$49.0M +286.8K shares	$81.4M 476.6K shares
M MIZUHO MARKETS AMERICAS LLC Institution	+$48.8M +285.8K shares	$48.8M 285.8K shares
B BlackRock, Inc. Institution	+$37.6M +220.0K shares	$2.5B 14.6M shares
A Assenagon Asset Management S.A. Institution	+$30.2M +176.9K shares	$36.1M 211.2K shares
M MANUFACTURERES LIFE INSURANCE CO Institution	+$30.1M +176.0K shares	$47.5M 278.4K shares
UBS Group AG Institution	+$28.0M +163.7K shares	$148.5M 869.5K shares

Biggest Sellers

Institution	Net Sold	Current Position
WELLINGTON MANAGEMENT CO LLP Long Only Manager	−$156.4M −916.1K shares	$1.8B 10.5M shares
UBS GLOBAL ASSET MANAGEMENT AMERICAS INC Long Only Manager	−$87.5M −512.6K shares	$172.2M 1.0M shares
Aristotle Capital Management, LLC Long Only Manager	−$65.9M −386.0K shares	$1.2B 7.2M shares
C Capital Group Private Client Services, Inc. RIA/Wealth	−$60.9M −356.4K shares	$17.7M 103.9K shares
Merewether Investment Management, LP Hedge Fund•Sector	−$47.1M −275.6K shares	$12.5M 72.9K shares
S Squarepoint Ops LLC Hedge Fund•Quant	−$39.4M −230.5K shares	$83.8M 490.5K shares
R REAVES W H & CO INC Institution	−$35.5M −207.8K shares	$18.0M 105.2K shares
A ADAGE CAPITAL PARTNERS GP LLC Institution	−$23.8M −139.4K shares	$24.9M 146.1K shares
A AMERICAN CENTURY COMPANIES INC Institution	−$18.5M −108.6K shares	$211.5M 1.2M shares
GQG Partners LLC Long Only Manager	−$18.2M −106.5K shares	$122.9M 719.6K shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited ATO in Q3 2025

New Positions: 47
New Value: $27.1M
Exited Positions: 70
Exited Value: $83.5M

New Positions

Institution	Position Value
Paradiem, LLC RIA/Wealth	$14.8M 86.4K shares
B BLI - Banque de Luxembourg Investments Institution	$2.7M 15.7K shares
V Virtus Investment Advisers, Inc. Institution	$2.0M 11.8K shares
Hudson Bay Capital Management LP Hedge Fund•Multi-Strategy	$1.7M 10.1K shares
Catalytic Wealth RIA, LLC RIA/Wealth	$987.4K 5.8K shares
T TEMA ETFS LLC Institution	$906.3K 5.3K shares
R RETIREMENT GUYS FORMULA LLC Institution	$513.4K 3.0K shares
Voleon Capital Management LP Hedge Fund•Quant	$385.7K 2.3K shares
Elm3 Financial Group, LLC RIA/Wealth	$347.1K 2.0K shares
Harvest Investment Services, LLC RIA/Wealth	$309.6K 1.8K shares

Exited Positions

Institution	Previous Position
L Laurel Wealth Advisors LLC RIA/Wealth	$15.9M 103.3K shares
Q Qube Research & Technologies Ltd Institution	$11.0M 71.6K shares
A AXA Institution	$8.9M 57.9K shares
G Gallo Partners, LP Hedge Fund•Sector	$6.3M 40.9K shares
M Mercuria Capital Strategies, LLC Institution	$5.1M 33.0K shares
Y Y-Intercept Ltd Institution	$3.5M 22.7K shares
N Northwest & Ethical Investments L.P. Institution	$3.0M 19.7K shares
U Union Bancaire Privee, UBP SA Institution	$2.9M 23.4K shares
I Ilex Capital Partners LLP Institution	$2.7M 17.2K shares
OCCUDO QUANTITATIVE STRATEGIES LP Hedge Fund•Market Neutral	$2.6M 17.0K shares

Options Activity

Institutions with the largest Call and Put options positions in ATO as of Q3 2025

Call Positions: 7
Call Value: $28.3M
Put Positions: 9
Put Value: $8.7M

Call Positions

Institution	Position Value
J JANE STREET GROUP, LLC Institution	$13.7M 803.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$5.9M 347.0 contracts
W WOLVERINE TRADING, LLC Institution	$3.1M 181.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$2.7M 157.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$1.4M 80.0 contracts
Walleye Trading LLC RIA/Wealth	$990.4K 58.0 contracts
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$512.3K 30.0 contracts

Put Positions

Institution	Position Value
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	$2.3M 137.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$1.8M 104.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$1.6M 92.0 contracts
Walleye Trading LLC RIA/Wealth	$973.3K 57.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$700.1K 41.0 contracts
CAPSTONE INVESTMENT ADVISORS, LLC Hedge Fund•Multi-Strategy	$597.6K 35.0 contracts
W WOLVERINE TRADING, LLC Institution	$457.8K 27.0 contracts
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$239.1K 14.0 contracts
J JANE STREET GROUP, LLC Institution	- - contracts

Most Committed Institutions

Institutions with ATO as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
SFMG, LLC Fund of Funds	Stephen Gaetano Vicinelli President	12.34% $177.9M	0.65% 1.0M shares	≤ Q2 2013 Held for 12y 5m+	$1.4B
Nilsine Partners, LLC RIA/Wealth	R Scott Bills CEO	7.93% $89.4M	0.33% 523.8K shares	Q4 2024 Held for 11 months	$1.1B
MEKETA INVESTMENT GROUP INC /ADV Fund of Funds	Peter Scott Woolley CEO	4.57% $1.4M	0.01% 8.2K shares	Q4 2024 Held for 11 months	$30.5M
Castellan Group, LLC Family Office	Barry Charles Brauch Managing Partner	4.47% $3.9M	0.01% 22.8K shares	Q1 2025 Held for 8 months	$87.1M
Paradiem, LLC RIA/Wealth	Eric Lee Dunavant President	3.44% $14.8M	0.05% 86.4K shares	Q3 2025 Held for 2 months	$428.9M
P Perpetual Ltd Institution	-	3.14% $253.3M	0.92% 1.5M shares	Q1 2023 Held for 2y 8m	$8.1B
A Aventail Capital Group, LP Hedge Fund•Long/Short	John (Nmn) Lee COO	2.75% $57.7M	0.21% 338.1K shares	Q1 2025 Held for 8 months	$2.1B
Partners Group Holding AG Private Equity	Charles Harry Dallara Chairman	2.72% $46.4M	0.17% 271.7K shares	≤ Q2 2013 Held for 12y 5m+	$1.7B
Aristotle Capital Management, LLC Long Only Manager	Christopher Arthur Fisher CCO	2.60% $1.2B	4.51% 7.2M shares	Q1 2022 Held for 3y 8m	$47.4B
PRING TURNER CAPITAL GROUP INC RIA/Wealth	Thomas John Kopas CEO	2.55% $4.2M	0.02% 24.4K shares	Q4 2021 Held for 3y 11m	$163.8M

Hedge Fund Spotlight

Discover hedge funds investing in ATO

Woodline Partners LP

Hedge Fund • Long/Short

Portfolio ManagerKarl Heinz Kroeker

Portfolio Value: $21.3B
Positions: 868
Last Reported: Q3 2025

Sector Allocation

Position in Atmos Energy

Market Value: $3.6M
Shares Held: 21.2K
Portfolio Weight: 0.02%
Owned Since: 2024-Q4

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