Atmus Filtration Technologies Inc.
US ˙ NYSE ˙ US04956D1072

SecurityATMU / Atmus Filtration Technologies Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership1,551,117 shares
Latest Disclosed Value $ 88,103,810
Janus Henderson Group Plc reports 13.28% increase in ownership of ATMU / Atmus Filtration Technologies Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 1,551,117 shares of Atmus Filtration Technologies Inc. (US:ATMU) valued at $88,056,912 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,369,325 shares of Atmus Filtration Technologies Inc.. This represents a change in shares of 13.28% during the quarter. The current value of the position is $71,211,781 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-18 2026-03-31 13F/A-1 ATMUS FILTRATION TECHNOLOGIE COM 04956D107 1,551,117 181,792 13.28 88,104 23.97 0.0149
2026-05-15 2026-03-31 13F ATMUS FILTRATION TECHNOLOGIE COM 04956D107 1,551,117 181,792 13.28 88,104 23.97 0.0163
2026-02-17 2025-12-31 13F ATMUS FILTRATION TECHNOLOGIE COM 04956D107 1,369,325 476,429 53.36 71,070 76.49 0.0318
2025-11-14 2025-09-30 13F ATMUS FILTRATION TECHNOLOGIE COM 04956D107 892,896 98,280 12.37 40,268 39.12 0.0184
2025-08-14 2025-06-30 13F ATMUS FILTRATION TECHNOLOGIE COM 04956D107 794,616 320,248 67.51 28,946 62.60 0.0142
2025-05-15 2025-03-31 13F ATMUS FILTRATION TECHNOLOGIE COM 04956D107 474,368 122,428 34.79 17,801 29.03 0.0098
2025-02-14 2024-12-31 13F ATMUS FILTRATION TECHNOLOGIE COM 04956D107 351,940 262,199 292.17 13,796 309.99 0.0070
2024-11-14 2024-09-30 13F ATMUS FILTRATION TECHNOLOGIE COM 04956D107 89,741 52,541 141.24 3,366 214.49 0.0017
2024-08-14 2024-06-30 13F ATMUS FILTRATION TECHNOLOGIE COM 04956D107 37,200 37,200 1,070 0.0006
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.