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Port Capital’s Atmus Filtration Technologies ATMU Stock Holding History

Port Capital’s Portfolio ATMU Stock Details ATMU Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$52.7M Buy
1,034,293
+125,613
+14% +$6.82M 2.15% 15
2026
Q1 		$51.6M Buy
908,680
+31,960
+4% +$1.89M 2.29% 16
2025
Q4 		$45.5M Buy
876,720
+446,260
+104% +$21.6M 1.96% 21
2025
Q3 		$19.4M Buy
+430,460
New +$18.1M 0.81% 35

Other funds holding ATMU

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Neuberger Berman Group
Neuberger Berman Group New York $150B AUM 40.08% 1-Year Est. Return

Port Capital's ATMU Position: Q2 2026 in Review

Port Capital increased its Atmus Filtration Technologies (ATMU) stake by 14% in Q2 2026, buying an estimated $6.82M and bringing the position to 1,034,293 shares worth $52.7M. The position accounts for 2.15% of the portfolio, ranked #15.

Port Capital first reported a position in ATMU in Q3 2025 and has held it in 4 quarters since. 336 funds tracked by Wall St. Rank hold ATMU as of Q2 2026.

  • Port Capital held 1,034,293 shares of Atmus Filtration Technologies worth $52.7M as of Q2 2026.
  • Port Capital bought 125,613 Atmus Filtration Technologies shares in Q2 2026, an estimated $6.82M.
  • Atmus Filtration Technologies made up 2.15% of Port Capital's portfolio in Q2 2026, its #15 holding.
  • Port Capital first reported a position in Atmus Filtration Technologies in Q3 2025 and has held it in 4 quarters since.
  • 336 funds tracked by Wall St. Rank held Atmus Filtration Technologies as of Q2 2026.

Based on Port Capital's 13F filing for Q2 2026, filed 14 Aug 2026.