GW&K Investment Management’s Atmus Filtration Technologies ATMU Stock Holding History

GW&K Investment Management’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	$19.9M	Sell	390,392 -48,807	-11%	-$2.65M	0.16%	223
2026 Q1	$24.9M	Sell	439,199 -43,483	-9%	-$2.57M	0.22%	169
2025 Q4	$25.1M	Buy	482,682 +34,269	+8%	+$1.66M	0.22%	178
2025 Q3	$20.2M	Sell	448,413 -14,362	-3%	-$603K	0.18%	195
2025 Q2	$16.9M	Sell	462,775 -4,950	-1%	-$177K	0.15%	220
2025 Q1	$17.2M	Buy	467,725 +9,207	+2%	+$363K	0.16%	218
2024 Q4	$18M	Buy	458,518 +22,100	+5%	+$897K	0.15%	220
2024 Q3	$16.4M	Buy	436,418 +400	+0.1%	+$13.1K	0.14%	225
2024 Q2	$12.5M	Buy	436,018 +22,590	+5%	+$685K	0.11%	237
2024 Q1	$13.3M	Buy	413,428 +111,565	+37%	+$2.67M	0.12%	232
2023 Q4	$7.09M	Buy	+301,863	New	+$6.47M	0.07%	250

Other funds holding ATMU

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Neuberger Berman Group New York $150B AUM 40.08% 1-Year Est. Return

GW&K Investment Management's ATMU Position: Q2 2026 in Review

GW&K Investment Management reduced its Atmus Filtration Technologies (ATMU) stake by 11% in Q2 2026, selling an estimated $2.65M and leaving 390,392 shares worth $19.9M. The position accounts for 0.16% of the portfolio, ranked #223.

GW&K Investment Management first reported a position in ATMU in Q4 2023 and has held it in 11 quarters since. The position peaked at $25.1M in Q4 2025. 335 funds tracked by Wall St. Rank hold ATMU as of Q2 2026.

GW&K Investment Management held 390,392 shares of Atmus Filtration Technologies worth $19.9M as of Q2 2026.
GW&K Investment Management sold 48,807 Atmus Filtration Technologies shares in Q2 2026, an estimated $2.65M.
Atmus Filtration Technologies made up 0.16% of GW&K Investment Management's portfolio in Q2 2026, its #223 holding.
GW&K Investment Management first reported a position in Atmus Filtration Technologies in Q4 2023 and has held it in 11 quarters since.
GW&K Investment Management's Atmus Filtration Technologies position peaked at $25.1M in Q4 2025.
335 funds tracked by Wall St. Rank held Atmus Filtration Technologies as of Q2 2026.

Based on GW&K Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.