Parsifal Capital Management, LP: ATMUS FILTRATION TECHNOLOGIE (ATMU): Quarterly 13F Position History
As of Q1 2026, Parsifal Capital Management, LP reported 788,987 shares of ATMUS FILTRATION TECHNOLOGIE (ATMU), worth $44.8M and representing 5.8% of its 13F equity book. Quarter-over-quarter share count change: 445,300 (-36.1%) . The position first appeared in Q1 2024 and has been disclosed across 9 13F-HR filings in Pactolio's tracked window.
- 788,987Shares Held (Latest Filing)
- $44.8MReported Market Value (Latest Filing)
- 5.8%Portfolio Weight (% of 13F Equity Book)
- 445,300Quarter-over-Quarter Share Change
- -$19.3MQuarter-over-Quarter Value Change
- 2,721,278Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 9 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 788,987 | 445,300 | -36.1% | $44.8M | 5.8% | $56.8 |
| Q4 2025 | 1,234,287 | 8,733 | -0.7% | $64.1M | 6.5% | $51.9 |
| Q3 2025 | 1,243,020 | 496,615 | -28.5% | $56.0M | 5.2% | $45.1 |
| Q2 2025 | 1,739,635 | +70,480 | +4.2% | $63.4M | 6.0% | $36.4 |
| Q1 2025 | 1,669,155 | 512,539 | -23.5% | $61.3M | 6.4% | $36.7 |
| Q4 2024 | 2,181,694 | 539,584 | -19.8% | $85.5M | 7.1% | $39.2 |
| Q3 2024 | 2,721,278 | +58,478 | +2.2% | $102.1M | 7.9% | $37.5 |
| Q2 2024 | 2,662,800 | +2,007,331 | +306.2% | $76.6M | 5.6% | $28.8 |
| Q1 2024 | 655,469 | — | — | $21.1M | 1.5% | $32.3 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did Parsifal Capital Management, LP first disclose a ATMU position in 13F-HR filings?
Parsifal Capital Management, LP first reported ATMUS FILTRATION TECHNOLOGIE (ATMU) on its 13F-HR filing for the period ending 2024-03-31 (Q1 2024). The position has appeared on 9 reported quarters within Pactolio's tracked window.
What was Parsifal Capital Management, LP's most recent quarter-over-quarter share-count change in ATMU?
Between Q4 2025 and Q1 2026, Parsifal Capital Management, LP reduced its ATMU position by 445,300 shares (-36.1%), leaving 788,987 shares at a market value of $44.8M.
Does the implied price-per-share represent Parsifal Capital Management, LP's cost basis in ATMU?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.