William Blair & Company’s Ceco Environmental CECO Stock Holding History

William Blair & Company’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	$210K	Buy	+2,317	New	+$183K	﹤0.01%	1558
2017 Q4	–	Sell	-157,283	Closed	-$1.33M	–	1373
2017 Q3	$1.33M	Sell	157,283 -2,500	-2%	-$21.5K	0.01%	652
2017 Q2	$1.47M	Buy	159,783 +4,400	+3%	+$44.4K	0.01%	646
2017 Q1	$1.76M	Buy	+155,383	New	+$1.87M	0.01%	573
2016 Q3	–	Sell	-10,980	Closed	-$96K	–	1289
2016 Q2	$96K	Hold	10,980	–	–	﹤0.01%	1174
2016 Q1	$68K	Sell	10,980 -2,000	-15%	-$13.5K	﹤0.01%	1144
2015 Q4	$99K	Hold	12,980	–	–	﹤0.01%	1150
2015 Q3	$106K	Hold	12,980	–	–	﹤0.01%	1334
2015 Q2	$147K	Buy	+12,980	New	+$148K	﹤0.01%	2088

Other funds holding CECO

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

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

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return

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

William Blair & Company's CECO Position: Q2 2026 in Review

William Blair & Company opened a new position in Ceco Environmental (CECO) in Q2 2026: 2,317 shares worth $210K. The stake represents ﹤0.01% of the portfolio and ranks #1558 among its holdings. This is a return to the name: William Blair & Company previously reported a position in CECO as recently as Q3 2017.

William Blair & Company first reported a position in CECO in Q2 2015 and has held it in 9 quarters since. The position peaked at $1.76M in Q1 2017. 343 funds tracked by Wall St. Rank hold CECO as of Q2 2026.

William Blair & Company held 2,317 shares of Ceco Environmental worth $210K as of Q2 2026.
Ceco Environmental was a new William Blair & Company position in Q2 2026.
Ceco Environmental made up ﹤0.01% of William Blair & Company's portfolio in Q2 2026, its #1558 holding.
William Blair & Company first reported a position in Ceco Environmental in Q2 2015 and has held it in 9 quarters since.
William Blair & Company's Ceco Environmental position peaked at $1.76M in Q1 2017.
343 funds tracked by Wall St. Rank held Ceco Environmental as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.