William Blair Investment Management
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William Blair Investment Management’s Ceco Environmental CECO Stock Holding History

William Blair Investment Management’s Portfolio CECO Stock Details CECO Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$12.2M Buy
+134,020
New +$10.6M 0.04% 297
2026
Q1 		– Sell
-706,273
Closed -$42.3M – 421
2025
Q4 		$42.3M Buy
706,273
+20,531
+3% +$1.1M 0.12% 154
2025
Q3 		$35.1M Sell
685,742
-260,155
-28% -$11M 0.09% 182
2025
Q2 		$26.8M Buy
945,897
+44,310
+5% +$1.1M 0.07% 241
2025
Q1 		$20.6M Buy
+901,587
New +$24M 0.06% 292

Other funds holding CECO

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
DCM
Driehaus Capital Management Chicago, Illinois $17.3B AUM 211.34% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
DSCM
Divisadero Street Capital Management Miami, Florida $4.41B AUM 90.53% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

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

William Blair Investment Management opened a new position in Ceco Environmental (CECO) in Q2 2026: 134,020 shares worth $12.2M. The stake represents 0.04% of the portfolio and ranks #297 among its holdings. This is a return to the name: William Blair Investment Management previously reported a position in CECO as recently as Q4 2025.

William Blair Investment Management first reported a position in CECO in Q1 2025 and has held it in 5 quarters since. The position peaked at $42.3M in Q4 2025. 343 funds tracked by Wall St. Rank hold CECO as of Q2 2026.

  • William Blair Investment Management held 134,020 shares of Ceco Environmental worth $12.2M as of Q2 2026.
  • Ceco Environmental was a new William Blair Investment Management position in Q2 2026.
  • Ceco Environmental made up 0.04% of William Blair Investment Management's portfolio in Q2 2026, its #297 holding.
  • William Blair Investment Management first reported a position in Ceco Environmental in Q1 2025 and has held it in 5 quarters since.
  • William Blair Investment Management's Ceco Environmental position peaked at $42.3M in Q4 2025.
  • 343 funds tracked by Wall St. Rank held Ceco Environmental as of Q2 2026.

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