Atmus Filtration Technologies

ATMU • NYSE

Atmus Filtration Technologies is a industrial - pollution & treatment controls company in the industrials sector on NYSE, led by Stephanie J. Disher, with a market cap of $4.3B. As of Q3 2025, 101% of shares are held by 286 institutional investors, with VANGUARD GROUP INC as the largest holder at 9.71%.

Chief Executive OfficerStephanie J. Disher

Market Cap$4.3B

Industrial - Pollution & Treatment Controls

Industrials

Employees4.5K

Websiteatmus.com

Country

United States of America

Overview

Overview of institutional ownership in ATMU as of Q3 2025 with a market cap of $3.7B

All Institutions

Institutions: 286
Value Held: $3.7B
Shares Held: 82.8M
Avg Position: $13.0M
Median Position: $976.4K

Hedge Funds

Hedge Funds: 41
Value Held: $617.8M
Shares Held: 13.7M
Avg Position: $15.1M
Median Position: $3.1M

Ownership Breakdown

Institutional (non-HF)

84.06%

$3.1B

Hedge Funds

16.68%

$617.8M

Retail & Other

Based on market cap of $3.7B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in ATMU as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
VANGUARD GROUP INC Institution	Salim Ramji CEO	$359.6M 0.01% of portfolio	9.71% 8.0M shares	Q2 2023 Held for 2y 5m	$6.69T
B BlackRock, Inc. Institution	-	$300.3M 0.01% of portfolio	8.11% 6.7M shares	Q2 2023 Held for 2y 5m	$5.67T
E EMINENCE CAPITAL LLC Hedge Fund•Long/Short	Ricky Chad Sandler CEO	$294.1M 4.24% of portfolio	7.94% 6.5M shares	Q3 2024 Held for 1y 2m	$6.9B
PRICE T ROWE ASSOCIATES INC /MD/ Long Only Manager	Robert W Sharps President	$184.0M 0.02% of portfolio	4.97% 4.1M shares	Q2 2023 Held for 2y 5m	$912.31B
FMR LLC Institution	-	$157.9M 0.01% of portfolio	4.26% 3.5M shares	Q2 2023 Held for 2y 5m	$1.92T
GOLDMAN SACHS GROUP INC Institution	David M. Solomon CEO	$136.9M 0.02% of portfolio	3.70% 3.0M shares	Q2 2023 Held for 2y 5m	$691.34B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$107.1M 0.01% of portfolio	2.89% 2.4M shares	Q3 2023 Held for 2y 2m	$1.57T
MORGAN STANLEY RIA/Wealth	Jed Finn CEO	$104.5M 0.01% of portfolio	2.82% 2.3M shares	Q2 2023 Held for 2y 5m	$1.65T
Invesco Ltd. ETF Provider	Brian Christopher Hartigan CEO	$100.3M 0.02% of portfolio	2.71% 2.2M shares	Q4 2023 Held for 1y 11m	$633.08B
WELLINGTON MANAGEMENT CO LLP Long Only Manager	Jean Marie Hynes CEO	$100.0M 0.02% of portfolio	2.70% 2.2M shares	Q2 2023 Held for 2y 5m	$571.21B

Net Capital Flow

Institutional buying and selling activity for ATMU in Q3 2025

Traded: +$23.2M
Buyers: 129
Sellers: 143
Total Bought: +$429.5M
Total Sold: −$406.3M
Avg Position: $11.9M

Biggest Buyers

Institution	Net Bought	Current Position
PRICE T ROWE ASSOCIATES INC /MD/ Long Only Manager	+$89.0M +2.0M shares	$184.0M 4.1M shares
Channing Capital Management, LLC Long Only Manager	+$75.0M +1.7M shares	$77.3M 1.7M shares
WESTWOOD HOLDINGS GROUP INC Institution	+$73.9M +1.6M shares	$73.9M 1.6M shares
FIRST TRUST ADVISORS LP ETF Provider	+$22.7M +503.4K shares	$68.9M 1.5M shares
P Port Capital LLC Hedge Fund•Value	+$19.4M +430.5K shares	$19.4M 430.5K shares
N NEW YORK STATE COMMON RETIREMENT FUND Institution	+$18.3M +406.8K shares	$19.5M 432.4K shares
N Nuveen, LLC Institution	+$11.3M +250.9K shares	$50.3M 1.1M shares
MANGROVE PARTNERS Hedge Fund•Multi-Strategy	+$10.4M +230.9K shares	$60.0M 1.3M shares
$DEUTSCHE BANK AG\ logo$ DEUTSCHE BANK AG\ Institution	+$8.6M +189.9K shares	$11.1M 246.1K shares
T TEACHER RETIREMENT SYSTEM OF TEXAS Institution	+$8.2M +182.6K shares	$25.2M 559.1K shares

Biggest Sellers

Institution	Net Sold	Current Position
R ROYAL BANK OF CANADA Institution	−$34.1M −757.1K shares	$5.1M 114.1K shares
Parsifal Capital Management, LP Hedge Fund•Multi-Strategy	−$22.4M −496.6K shares	$56.0M 1.2M shares
A AMERICAN CENTURY COMPANIES INC Institution	−$21.9M −485.0K shares	$3.0M 66.6K shares
FMR LLC Institution	−$21.6M −479.7K shares	$157.9M 3.5M shares
M MANUFACTURERES LIFE INSURANCE CO Institution	−$19.6M −435.7K shares	$46.8M 1.0M shares
D D. E. Shaw & Co., Inc. Institution	−$19.3M −427.4K shares	$79.7M 1.8M shares
N Neuberger Berman Group LLC Institution	−$18.9M −518.1K shares	Sold Off 0 shares
WELLINGTON MANAGEMENT CO LLP Long Only Manager	−$18.7M −414.4K shares	$100.0M 2.2M shares
Hawk Ridge Management LLC Hedge Fund•Long/Short	−$15.8M −434.8K shares	Sold Off 0 shares
T T. Rowe Price Investment Management, Inc. Insurance Manager	−$13.4M −297.3K shares	$59.7M 1.3M shares

Entry and Exit Activity

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

New Positions: 26
New Value: $97.5M
Exited Positions: 26
Exited Value: $59.6M

New Positions

Institution	Position Value
WESTWOOD HOLDINGS GROUP INC Institution	$73.9M 1.6M shares
P Port Capital LLC Hedge Fund•Value	$19.4M 430.5K shares
E Elo Mutual Pension Insurance Co Institution	$733.4K 16.3K shares
Round Rock Advisors, LLC RIA/Wealth	$606.8K 13.5K shares
Connor, Clark & Lunn Investment Management Ltd. Long Only Manager	$495.3K 11.0K shares
P Perbak Capital Partners LLP Institution	$414.6K 9.2K shares
P PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO Institution	$288.9K 6.4K shares
Empirical Financial Services, LLC RIA/Wealth	$263.9K 5.9K shares
ZWJ INVESTMENT COUNSEL INC RIA/Wealth	$251.1K 5.6K shares
C CI Private Wealth, LLC RIA/Wealth	$231.4K 5.1K shares

Exited Positions

Institution	Previous Position
N Neuberger Berman Group LLC Institution	$18.9M 518.1K shares
Hawk Ridge Management LLC Hedge Fund•Long/Short	$15.8M 434.8K shares
CTF Capital Management, LP Hedge Fund•Long/Short	$6.1M 166.9K shares
T TWINBEECH CAPITAL LP Hedge Fund•Quant	$5.6M 154.7K shares
SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC Hedge Fund•Distressed	$3.6M 99.0K shares
H HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Institution	$2.5M 67.8K shares
S Sapience Investments, LLC Long Only Manager	$1.5M 42.1K shares
Magnetar Financial LLC Hedge Fund•Multi-Strategy	$1.2M 31.6K shares
OCCUDO QUANTITATIVE STRATEGIES LP Hedge Fund•Market Neutral	$685.5K 18.8K shares
F Freestone Grove Partners LP Hedge Fund•Multi-Strategy	$672.7K 18.5K shares

Options Activity

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

Call Positions: 6
Call Value: $15.4M
Put Positions: 3
Put Value: $1.5M

Call Positions

Institution	Position Value
P PEAK6 LLC Institution	$7.6M 1.7K contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$5.9M 1.3K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$825.1K 183.0 contracts
J JANE STREET GROUP, LLC Institution	$590.7K 131.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$239.0K 53.0 contracts
Walleye Trading LLC RIA/Wealth	$216.4K 48.0 contracts

Put Positions

Institution	Position Value
P PEAK6 LLC Institution	$870.2K 193.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$514.0K 114.0 contracts
Walleye Trading LLC RIA/Wealth	$130.8K 29.0 contracts

Most Committed Institutions

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

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
Yost Capital Management, L.L.C. Hedge Fund•Long/Short	Jason Kyle Knutson CFO	8.17% $6.7M	0.18% 149.0K shares	Q3 2024 Held for 1y 2m	$82.3M
M Medina Singh Partners, LLC Hedge Fund•Value	Kristofer Lee Medina Managing Partner	5.32% $22.8M	0.61% 504.8K shares	Q2 2023 Held for 2y 5m	$428.0M
Parsifal Capital Management, LP Hedge Fund•Multi-Strategy	Lucas Robert Warford President	5.22% $56.0M	1.51% 1.2M shares	Q1 2024 Held for 1y 8m	$1.1B
E EMINENCE CAPITAL LLC Hedge Fund•Long/Short	Ricky Chad Sandler CEO	4.24% $294.1M	7.94% 6.5M shares	Q3 2024 Held for 1y 2m	$6.9B
MANGROVE PARTNERS Hedge Fund•Multi-Strategy	Nathaniel Hall August President	4.21% $60.0M	1.62% 1.3M shares	Q3 2023 Held for 2y 2m	$1.4B
B Bayberry Capital Partners LP Hedge Fund•Long/Short	Brian Cromwell Smith CFO	4.12% $12.7M	0.34% 282.5K shares	Q1 2024 Held for 1y 8m	$309.0M
CIBELLI CAPITAL MANAGEMENT LLC Hedge Fund•Activist	Mario David Cibelli Managing Partner	4.10% $5.1M	0.14% 112.5K shares	Q4 2024 Held for 11 months	$123.6M
I Ionic Capital Management LLC Hedge Fund•Multi-Strategy	Bart Ethan Baum CIO	3.71% $3.1M	0.08% 68.4K shares	Q1 2024 Held for 1y 8m	$83.1M
PRENTISS SMITH & CO INC RIA/Wealth	Karlie Packard Borst President	2.73% $4.8M	0.13% 107.2K shares	Q1 2024 Held for 1y 8m	$177.1M
Channing Capital Management, LLC Long Only Manager	Rodney Bernard Herenton CEO	2.04% $77.3M	2.09% 1.7M shares	Q2 2025 Held for 5 months	$3.8B

Hedge Fund Spotlight

Discover hedge funds investing in ATMU

MANGROVE PARTNERS

Hedge Fund • Multi-Strategy

Portfolio ManagerNathaniel Hall August

Portfolio Value: $1.4B
Positions: 156
Last Reported: Q3 2025

Sector Allocation

Position in Atmus Filtration Technologies

Market Value: $60.0M
Shares Held: 1.3M
Portfolio Weight: 4.21%
Owned Since: 2023-Q3

Top Holding	Sector	Market Value	Weight
1 ECDAW ECD Automotive Design, Inc. ECDAW	Auto - Manufacturers Consumer Cyclical	$150.8M	10.58%
2 Indivior INDV	Drug Manufacturers - Specialty & Generic Healthcare	$66.1M	4.64%
3 RIO Rio Tinto RIO	Unknown Unknown	$65.9M	4.63%

View full profile

Atmus Filtration Technologies

Overview

All Institutions

Hedge Funds

Ownership Breakdown

Biggest Investors

Net Capital Flow

Biggest Buyers

Biggest Sellers

Entry and Exit Activity

New Positions

Exited Positions

Options Activity

Call Positions

Put Positions

Most Committed Institutions

Hedge Fund Spotlight

Position in Atmus Filtration Technologies

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