William Blair Investment Management
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William Blair Investment Management’s Ecovyst ECVT Stock Holding History

William Blair Investment Management’s Portfolio ECVT Stock Details ECVT Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$10.7M Sell
860,439
-1,004,182
-54% -$13.6M 0.03% 308
2026
Q1 		$24M Sell
1,864,621
-864,128
-32% -$9.76M 0.08% 234
2025
Q4 		$26.6M Sell
2,728,749
-285,411
-9% -$2.49M 0.07% 230
2025
Q3 		$26.4M Sell
3,014,160
-182,742
-6% -$1.61M 0.07% 246
2025
Q2 		$26.3M Sell
3,196,902
-264,414
-8% -$1.86M 0.07% 244
2025
Q1 		$21.5M Sell
3,461,316
-140,030
-4% -$1.04M 0.06% 283
2024
Q4 		$27.5M Buy
3,601,346
+67,338
+2% +$498K 0.07% 271
2024
Q3 		$24.2M Sell
3,534,008
-108,665
-3% -$828K 0.06% 279
2024
Q2 		$32.7M Sell
3,642,673
-7,731
-0.2% -$74.8K 0.09% 204
2024
Q1 		$40.7M Buy
3,650,404
+334,004
+10% +$3.16M 0.11% 179
2023
Q4 		$32.4M Sell
3,316,400
-54,209
-2% -$516K 0.09% 212
2023
Q3 		$33.2M Buy
3,370,609
+130,210
+4% +$1.39M 0.11% 182
2023
Q2 		$37.1M Buy
+3,240,399
New +$35.3M 0.12% 177

Other funds holding ECVT

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
RCMNY
Rubric Capital Management (New York) New York $10.9B AUM 70.31% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Arrowstreet Capital
Arrowstreet Capital Boston, Massachusetts $225B AUM 49.49% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Brown Advisory
Brown Advisory Baltimore, Maryland $64.6B AUM 18.98% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

William Blair Investment Management's ECVT Position: Q2 2026 in Review

William Blair Investment Management reduced its Ecovyst (ECVT) stake by 54% in Q2 2026, selling an estimated $13.6M and leaving 860,439 shares worth $10.7M. The position accounts for 0.03% of the portfolio, ranked #308.

William Blair Investment Management first reported a position in ECVT in Q2 2023 and has held it in 13 quarters since. The position peaked at $40.7M in Q1 2024. 209 funds tracked by Wall St. Rank hold ECVT as of Q2 2026.

  • William Blair Investment Management held 860,439 shares of Ecovyst worth $10.7M as of Q2 2026.
  • William Blair Investment Management sold 1,004,182 Ecovyst shares in Q2 2026, an estimated $13.6M.
  • Ecovyst made up 0.03% of William Blair Investment Management's portfolio in Q2 2026, its #308 holding.
  • William Blair Investment Management first reported a position in Ecovyst in Q2 2023 and has held it in 13 quarters since.
  • William Blair Investment Management's Ecovyst position peaked at $40.7M in Q1 2024.
  • 209 funds tracked by Wall St. Rank held Ecovyst as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.