Round Rock Advisors
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Round Rock Advisors’s Atmus Filtration Technologies ATMU Stock Holding History

Round Rock Advisors’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
Q3 		$295K Hold
6,789
– – 0.04% 257
2026
Q2 		$346K Sell
6,789
-5,689
-46% -$309K 0.04% 262
2026
Q1 		$708K Sell
12,478
-1,004
-7% -$59.3K 0.11% 146
2025
Q4 		$700K Buy
13,482
+24
+0.2% +$1.16K 0.11% 151
2025
Q3 		$607K Buy
+13,458
New +$565K 0.1% 146

Other funds holding ATMU

BlackRock
BlackRock New York $6.79T AUM 37.06% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.21T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.32T AUM 44.66% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.76T AUM
Invesco
Invesco Atlanta, Georgia $1.27T AUM 50.62% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return
Neuberger Berman Group
Neuberger Berman Group New York $148B AUM 31.56% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.96T AUM 27.49% 1-Year Est. Return

Round Rock Advisors's ATMU Position: Q3 2026 in Review

Round Rock Advisors held its Atmus Filtration Technologies (ATMU) position steady in Q3 2026 at 6,789 shares worth $295K. The position accounts for 0.04% of the portfolio, ranked #257.

Round Rock Advisors first reported a position in ATMU in Q3 2025 and has held it in 5 quarters since. The position peaked at $708K in Q1 2026. 252 funds tracked by Wall St. Rank hold ATMU as of Q3 2026.

  • Round Rock Advisors held 6,789 shares of Atmus Filtration Technologies worth $295K as of Q3 2026.
  • Round Rock Advisors left its Atmus Filtration Technologies share count unchanged in Q3 2026.
  • Atmus Filtration Technologies made up 0.04% of Round Rock Advisors's portfolio in Q3 2026, its #257 holding.
  • Round Rock Advisors first reported a position in Atmus Filtration Technologies in Q3 2025 and has held it in 5 quarters since.
  • Round Rock Advisors's Atmus Filtration Technologies position peaked at $708K in Q1 2026.
  • 252 funds tracked by Wall St. Rank held Atmus Filtration Technologies as of Q3 2026.

Based on Round Rock Advisors's 13F filing for Q3 2026, filed 12 Nov 2026.