Atmus Filtration Technologies
ATMU on NYSE. Atmus sells filters to makers and owners of trucks, farm, and construction equipment. Market value $3.8bn.
Price checks use the past 12 months to June 2026. Quality checks use five annual reports, the latest for the year to December 2025.
Should I look at this?
Worth a closer look
Why it could be worth it
What to watch out for
Nothing stood out in the numbers we check.
This is not advice. Check the numbers below.
For every $100 of what the whole company costs, it produced $5.08 of spare cash in the past 12 months. A savings account pays about $4.
You pay 13.8 years of operating profit for the business. The average large US company costs around 18.
Each dollar kept in the business earns 33 cents a year. Above 10 is good.
Quality score: 84 of 100. Price score: 90 of 100. Our list needs 70 on quality and 60 on price.
$45.96 a share, 8% above its 1-year low
Over the past year the price has ranged from $42.60 to $66.50.
Dividend: 0.5% a year
Paid every year for 2 years
Prices from Tuesday’s close (6 October).
Five years of cash, in billions
| Revenue | |||
| Revenue | $1.6bn | $1.7bn | $1.8bn |
| Operating margin | |||
| Operating margin | 15.3% | 15.9% | 16.9% |
| Debt to equity | |||
| Debt to equity | 7.44 | 2.61 | 1.51 |
| Shares outstanding | |||
| Shares outstanding | 0.08bn | 0.08bn | 0.08bn |
Health checks
- Free cash flow positive3 of 3 years
- Accounting looks honest (Beneish)Nothing unusual
- Financial strength (Piotroski)6 of 8 checks we could run
- Profit backed by cash (accruals)Yes
- Debt1.51× equity
- Revenue growth, five yearsUnknown
- Buying back its own sharesRoughly flat
The quarter to June 2026
How the business did, compared with the same quarter a year earlier.
- Sales: $528 million last quarter, up 16% on a year ago.
- Profit: $64 million, up 7% on a year ago.
- It keeps 17 cents of each $1 of sales as operating profit, up from 16 cents a year earlier.
- Spare cash over the past 12 months: $190 million, up from $113 million.
- 1% fewer shares than a year ago. Each share owns a bit more of the company.
- Debt is $742 million more than cash, up from $395 million a year ago.
- Sales grew on a year ago in each of the last 4 quarters.
| Quarter to | Amount |
|---|---|
| September 2024 | $404m |
| December 2024 | $407m |
| March 2025 | $417m |
| June 2025 | $454m |
| September 2025 | $448m |
| December 2025 | $447m |
| March 2026 | $478m |
| June 2026 | $528m |
| Quarter to | Amount |
|---|---|
| September 2024 | $44m |
| December 2024 | $40m |
| March 2025 | $45m |
| June 2025 | $60m |
| September 2025 | $55m |
| December 2025 | $48m |
| March 2026 | $48m |
| June 2026 | $64m |
From the company's quarterly reports to the SEC.
Dates
- Next results (estimated)
- n/a
- Last annual report (10-K)
- 13 February 2026
- Next quarterly (estimated, 10-Q)
- 6 November 2026
Who owns it
5 long-term investors we follow own it, up from 4 last quarter. 335 funds in all.
- Cambiar InvestorsBrian Barish
- Value
- $1m
- Share of fund
- <0.1%
| Fund | Value | Share of that fund | Change |
|---|---|---|---|
| Royce & AssociatesChuck Royce | $51m | 0.4% | Added |
| Boston PartnersBoston Partners team | $25m | <0.1% | New |
| Hotchkis & WileyHotchkis & Wiley team | $10m | <0.1% | Added |
| Cambiar InvestorsBrian Barish | $1m | <0.1% | |
| Barrow HanleyBarrow Hanley team | $10,606 | <0.1% | Added |
Largest holders overall
- BlackRock$632mAdded
- FMR$271mAdded
- Vanguard Portfolio Management$235mAdded
- Invesco$227mAdded
- Price T Rowe Associates$224mCut
- Vanguard Capital Management$184m
- State Street$166mAdded
- Goldman Sachs Group$148mCut
- Geode Capital Management$146mAdded
- Neuberger Berman Group$123mAdded
From 13F filings for the quarter ended 30 June 2026.
Big holders and activists
7 investors own more than 5%.
- BlackRock, Inc.Passive investor14.2%Since 30 April 2026
- FMR LLCPassive investorat least 6.5%+1.1 pts(filed with 1 related holder)Since 30 June 2026
- Vanguard Portfolio ManagementPassive investor5.7%Since 30 June 2026
- T. Rowe Price Associates, Inc.Passive investor5.7%+3.2 ptsSince 31 December 2025
- Invesco Ltd.Passive investor5.5%Since 30 June 2026
- Vanguard Capital ManagementPassive investor5.1%Since 31 March 2026
- Eminence Capital, LPPassive investorat least 4.7%−2.2 pts(filed with 1 related holder)Since 31 December 2025
- The Vanguard GroupPassive investorSold down below 5%Since 13 March 2026
| Holder | Stake | Since | |
|---|---|---|---|
BlackRock, Inc. Passive investor | 14.2% | 30 April 2026 | |
FMR LLC Passive investor | at least 6.5%+1.1 pts (filed with 1 related holder) | 30 June 2026 | |
Vanguard Portfolio Management Passive investor | 5.7% | 30 June 2026 | |
T. Rowe Price Associates, Inc. Passive investor | 5.7%+3.2 pts | 31 December 2025 | |
Invesco Ltd. Passive investor | 5.5% | 30 June 2026 | |
Vanguard Capital Management Passive investor | 5.1% | 31 March 2026 | |
Eminence Capital, LP Passive investor | at least 4.7%−2.2 pts (filed with 1 related holder) | 31 December 2025 | |
The Vanguard Group Passive investor | Sold down below 5% | 13 March 2026 |
From Schedule 13D and 13G filings: anyone owning more than 5% must file one.
What insiders did
In the last 12 months, 2 insiders bought $209,543 of shares on the open market. 5 sold $2m.
- Swan ReneeChief People OfficerSold
- Date
- 17 August 2026
- Shares
- 3,870
- Price
- $50.89
- Value
- $196,956
- Macadam Stephen E.DirectorBought
- Date
- 12 August 2026
- Shares
- 2,000
- Price
- $49.78
- Value
- $99,551
- Swan ReneeChief People OfficerSold
- Date
- 1 June 2026
- Shares
- 2,566
- Price
- $45.25
- Value
- $116,112
- Kienzler JackChief Financial OfficerSold
- Date
- 1 June 2026
- Shares
- 5,132
- Price
- $45.25
- Value
- $232,223
- Masters CharlesSenior Vice PresidentSold
- Date
- 1 June 2026
- Shares
- 2,890
- Price
- $45.25
- Value
- $130,773
- Disher StephanieChief Executive Officer, DirectorSold
- Date
- 1 June 2026
- Shares
- 25,652
- Price
- $45.25
- Value
- $1m
- HAGGERTY GRETCHEN RDirectorBought
- Date
- 12 May 2026
- Shares
- 1,973
- Price
- $55.74
- Value
- $109,992
- Donoso DiegoDirectorSold
- Date
- 13 November 2025
- Shares
- 20
- Price
- $48.84
- Value
- $977
| Date | Who | Did | Shares | Price | Value |
|---|---|---|---|---|---|
| 17 August 2026 | Swan Renee Chief People Officer | Sold | 3,870 | $50.89 | $196,956 |
| 12 August 2026 | Macadam Stephen E. Director | Bought | 2,000 | $49.78 | $99,551 |
| 1 June 2026 | Swan Renee Chief People Officer | Sold | 2,566 | $45.25 | $116,112 |
| 1 June 2026 | Kienzler Jack Chief Financial Officer | Sold | 5,132 | $45.25 | $232,223 |
| 1 June 2026 | Masters Charles Senior Vice President | Sold | 2,890 | $45.25 | $130,773 |
| 1 June 2026 | Disher Stephanie Chief Executive Officer, Director | Sold | 25,652 | $45.25 | $1m |
| 12 May 2026 | HAGGERTY GRETCHEN R Director | Bought | 1,973 | $55.74 | $109,992 |
| 13 November 2025 | Donoso Diego Director | Sold | 20 | $48.84 | $977 |
From Form 4 filings: insiders must report trades in their own company's shares within two days.
Warning signs in its filings
Problems the company itself reported to the SEC, in its own words.
None of the warning signs we check for were found.
We look for five warning signs: doubt it can keep going, weak checks on its own accounts, a notice that its past accounts can't be relied on, a change of auditor, and one customer bringing in a big share of sales. We don't check lawsuits, investigations or debt yet.
We checked the auditor's report, internal controls, restatement notices, auditor changes and big customers in the 10-K filed 13 Feb 2026, plus the 10-Q filed 7 Aug 2026 and 6 later 8-Ks.
A 10-K is the yearly report every US company files with the SEC. An 8-K is a short notice of a big event.
What could go wrong
Cheap for a reason is the question the numbers cannot answer.
Whether the price already reflects the risks is what the deep dive is for.
What changed in the risks this year
Companies must list what could hurt them each year. These are the parts that changed since last year’s report.
Increased tariffs or the imposition of other barriers to international trade could impact the cost of our products, demand for our products and our competitive position.
Already happenedFor example, since February 2025, the U.S. presidential administration has announced new and substantial tariff increases on imports to the United States from China, Mexico, Canada and India. Since then, various modifications and delays to these tariffs have been implemented, with further changes anticipated. These modifications include additional sector-specific tariffs or other measures. These actions have prompted a variety of tariff responses by countries, which have the potential to affect our business. Several tariff announcements have been followed by announcements of temporary pauses and limited exemptions, such as the temporary exemption for goods that enter the U.S. as qualifying goods under the United States-Mexico-Canada Agreement (“USMCA”), for which the majority of our products from Mexico for the U.S. market are certified compliant, or expected to be certified compliant. These temporary exemptions, including those we are availing ourselves to under the USMCA, may be reduced or eliminated in the future. The ongoing trade disputes associated with these tariff measures and the potential escalation of trade disputes would pose a significant risk to our business and would affect our revenue and cost of goods sold. For instance, we have raised the prices of certain of our products in response to cost increases we have incurred on purchases of finished and other goods and some raw materials due to tariffs. The extent and duration of the tariffs and the resulting impact on general economic conditions and our business are uncertain and depend on various factors, such as negotiations between the U.S. and affected countries, the responses of other countries or regions, exemptions or exclusions that may be granted, availability and cost of alternative sources of supply, and demand for our products in affected markets. Further, actions we take to adapt to new tariffs or trade restrictions, including raising the prices of our products or shifting supply sourcing or production locations, may cause us to modify our operations, lose customers, experience increased costs, or forgo business opportunities.
Read moreOur information technology environment and our products are exposed to potential security or data breaches or other disruptions, which may adversely impact our operations.
Could happenA number of our operations depend on information technology infrastructure and assets that are increasing in complexity, which are undergoing changes as a result of the Separation .
The deep dive
Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.
- What the business is worth, as a range, and the margin of safety at today’s price
- Prices to start buying, buy, and buy hard
- The three things that would make this a mistake
- Every number footnoted to the filing it came from
Your first deep dive is free.
Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.