Citadel Advisors
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Citadel Advisors’s Ceco Environmental CECO Stock Holding History

Citadel Advisors’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
Q1 		$1.02M Buy
17,200
+11,700
+213% +$753K ﹤0.01% 7605
2025
Q4 		$329K Sell
5,500
-2,600
-32% -$139K ﹤0.01% 9943
2025
Q3 		$415K Buy
8,100
+100
+1% +$4.23K ﹤0.01% 9577
2025
Q2 		$226K Buy
8,000
+700
+10% +$17.4K ﹤0.01% 10425
2025
Q1 		$166K Sell
7,300
-11,700
-62% -$312K ﹤0.01% 10709
2024
Q4 		$574K Buy
19,000
+1,800
+10% +$51.2K ﹤0.01% 8254
2024
Q3 		$485K Sell
17,200
-8,600
-33% -$242K ﹤0.01% 8325
2024
Q2 		$744K Buy
25,800
+16,500
+177% +$400K ﹤0.01% 7225
2024
Q1 		$214K Sell
9,300
-4,600
-33% -$94.8K ﹤0.01% 10176
2023
Q4 		$282K Sell
13,900
-900
-6% -$16.4K ﹤0.01% 9298
2023
Q3 		$236K Buy
14,800
+8,200
+124% +$112K ﹤0.01% 9604
2023
Q2 		$88.2K Sell
6,600
-1,200
-15% -$14.9K ﹤0.01% 11114
2023
Q1 		$109K Buy
7,800
+3,500
+81% +$49.5K ﹤0.01% 11124
2022
Q4 		$50.2K Buy
+4,300
New +$48.7K ﹤0.01% 12137
2016
Q1 		– Sell
-9,500
Closed -$73K – 6860
2015
Q4 		$73K Sell
9,500
-3,000
-24% -$25.4K ﹤0.01% 6986
2015
Q3 		$102K Buy
+12,500
New +$117K ﹤0.01% 6939

Other funds holding CECO

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $124B AUM 33.93% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Citadel Advisors's CECO Position: Q1 2026 in Review

Citadel Advisors increased its Ceco Environmental (CECO) stake by 234% in Q1 2026, buying an estimated $9.8M and bringing the position to 217,386 shares worth $13M. The position accounts for ﹤0.01% of the portfolio, ranked #2878.

Citadel Advisors first reported a position in CECO in Q3 2015 and has held it in 37 quarters since. The position peaked at $17.6M in Q3 2025. 262 funds tracked by Wall St. Rank hold CECO as of Q1 2026.

  • Citadel Advisors held 217,386 shares of Ceco Environmental worth $13M as of Q1 2026.
  • Citadel Advisors bought 152,324 Ceco Environmental shares in Q1 2026, an estimated $9.8M.
  • Ceco Environmental made up ﹤0.01% of Citadel Advisors's portfolio in Q1 2026, its #2878 holding.
  • Citadel Advisors first reported a position in Ceco Environmental in Q3 2015 and has held it in 37 quarters since.
  • Citadel Advisors's Ceco Environmental position peaked at $17.6M in Q3 2025.
  • 262 funds tracked by Wall St. Rank held Ceco Environmental as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.