CECO ENVIRONMENTAL CORP CECO
COM · Common Stock · CUSIP 125141101
- SectorIndustrials
- IndustryIndustrial & Commercial Fans & Blowers & Air Purifing Equip
- HeadquartersAddison, TX
- Founded1966
- Websitececoenviro.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($1.3m this quarter). Holder counts are more reliable. Shares outstanding: 58.6m as of 2026-08-03, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $90.64. Options: 8 managers hold calls ($26.2m notional), 6 hold puts ($23.4m).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 113 |
| Q4 2022 | 121 |
| Q1 2023 | 141 |
| Q2 2023 | 145 |
| Q3 2023 | 148 |
| Q4 2023 | 158 |
| Q1 2024 | 176 |
| Q2 2024 | 179 |
| Q3 2024 | 176 |
| Q4 2024 | 178 |
| Q1 2025 | 173 |
| Q2 2025 | 181 |
| Q3 2025 | 226 |
| Q4 2025 | 232 |
| Q1 2026 | 266 |
| Q2 2026 | 345 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 72 | 89 |
| Q4 2024 | 73 | 85 |
| Q1 2025 | 68 | 91 |
| Q2 2025 | 93 | 70 |
| Q3 2025 | 116 | 95 |
| Q4 2025 | 113 | 105 |
| Q1 2026 | 144 | 106 |
| Q2 2026 | 242 | 94 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $1.0m | $1.6m | 1.63 |
| Q4 2025 | $1.4m | $6.0k | 0.00 |
| Q1 2026 | $3.2m | $1.5m | 0.45 |
| Q2 2026 | $26.2m | $23.4m | 0.89 |
Biggest buyers
| FMR LLC | Added | +2.2m |
| BlackRock, Inc. | Added | +2.0m |
| DIMENSIONAL FUND ADVISORS LP | Added | +1.3m |
| Divisadero Street Capital Management, LP | Added | +1.1m |
| VANGUARD CAPITAL MANAGEMENT LLC | Added | +1.0m |
| Driehaus Capital Management LLC | Added | +920.6k |
| PRICE T ROWE ASSOCIATES INC /MD/ | Added | +814.3k |
| Invesco Ltd. | Added | +631.0k |
| STATE STREET CORP | Added | +607.3k |
| GEODE CAPITAL MANAGEMENT, LLC | Added | +604.3k |
Biggest sellers
| FARALLON CAPITAL MANAGEMENT, L.L.C. | Sold out | -234.0k |
| MARSHALL WACE, LLP | Reduced | -194.0k |
| OSTERWEIS CAPITAL MANAGEMENT INC | Reduced | -174.8k |
| MARTIN & CO INC /TN/ | Reduced | -138.1k |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | Reduced | -127.7k |
| FRANKLIN RESOURCES INC | Reduced | -126.3k |
| Squarepoint Ops LLC | Reduced | -85.6k |
| MORGAN STANLEY | Reduced | -83.9k |
| 4D Advisors, LLC | Sold out | -65.0k |
| SG Americas Securities, LLC | Reduced | -59.9k |
Biggest calls
| PEAK6 LLC | New | $10.9m120.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $6.4m70.8k shares |
| Caption Management, LLC | New | $4.4m48.6k shares |
| CITADEL ADVISORS LLC | Added | $2.1m23.5k shares |
| JANE STREET GROUP, LLC | Added | $2.1m22.7k shares |
| IMC-Chicago, LLC | New | $281.3k3.1k shares |
| SIMPLEX TRADING, LLC | Unchanged | $27.2k300 shares |
| GROUP ONE TRADING LLC | New | $9.1k100 shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $17.2m189.9k shares |
| PEAK6 LLC | New | $2.6m29.2k shares |
| JANE STREET GROUP, LLC | New | $1.7m18.6k shares |
| CITADEL ADVISORS LLC | Added | $1.4m15.9k shares |
| IMC-Chicago, LLC | New | $217.8k2.4k shares |
| SIMPLEX TRADING, LLC | Added | $208.7k2.3k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
DEZWIREK JASON
13D · may seek influence
filed 2026-02-26
Stated purposeItem 4 of the Schedule 13D is hereby amended and supplemented by adding the following at the end thereof: On February 23, 2026, the Issuer, Longhorn Merger Sub Inc., a Delaware corporation and wholly owned subsidiary of the Issuer ("Merger Sub Inc."), and Longhorn Merger Sub LLC, a Delaware limited liability company and wholly owned subsidiary of the Issuer ("Merger Sub LLC"), and Thermon Group Holdings, Inc., a Delaware corporation ("Thermon") entered into an Agreement and Plan of Merger, dated as of February 23, 2026 (the "Merger Agreement"), which provided for, among other things, (i) the merger of Merger Sub Inc. with and into Thermon, with Thermon continuing as the surviving entity (the "Surviving Corporation") (the "First Merger") and (ii) immediately following the First Merger, the… Full filing |
11.7% |
| FMR LLC 13G · institution +1.5 pts · filed 2026-08-06 | 7.7% |
| BlackRock, Inc. 13G · institution filed 2025-07-16 | 6.3% |
Fell to 5% or below in the last year: AMERICAN CENTURY INVESTMENT MANAGEMENT INC (3.6%, 2026-08-14), T. Rowe Price Investment Management, Inc. (3.7%, 2026-08-14), VANGUARD GROUP INC (5.0%, 2026-01-30), Hood River Capital Management LLC (1.4%, 2025-11-14)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 1 | $377.8k | 1 | $648.3k | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 1 | $339.9k | 3 | $20.2m | — |
| Q4 2025 | 0 | — | 0 | — | — |
| Q1 2026 | 0 | — | 0 | — | — |
| Q2 2026 | 1 | $2.6m | 3 | $10.3m | — |
| Q3 2026 | 0 | — | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-06-25 | DEZWIREK JASON Director · By 0to100 Inc. | Sold | $3.3m34.0k shares |
| 2026-06-24 | DEZWIREK JASON Director · By 0to100 Inc. | Sold | $3.3m34.0k shares |
| 2026-06-24 | Johansson Peter K. SVP, Chief Financial Officer | Sold | $2.9m30.0k shares |
| 2026-06-01 | WALLMAN RICHARD F Director | Bought | $1.5m20.0k shares |
| 2026-05-01 | Nanda Munish Director | Sold | $830.1k11.2k shares |
| 2026-04-29 | WALLMAN RICHARD F Director | Bought | $732.5k10.0k shares |
| 2026-04-29 | WALLMAN RICHARD F Director | Bought | $369.0k5.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| FMR LLC 0.02% of their portfolio | 4.5m $410.5m | Added +2.2m |
| BlackRock, Inc. 0.01% of their portfolio | 4.3m $392.4m | Added +2.0m |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 2.3m $212.3m | Added +1.0m |
| DIMENSIONAL FUND ADVISORS LP 0.04% of their portfolio | 2.2m $198.3m | Added +1.3m |
| T. Rowe Price Investment Management, Inc. 0.13% of their portfolio | 2.2m $195.4m | Added +22.1k |
| AMERICAN CENTURY COMPANIES INC 0.08% of their portfolio | 2.1m $189.5m | Added +194.2k |
| Driehaus Capital Management LLC 0.82% of their portfolio | 1.6m $141.6m | Added +920.6k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 1.5m $132.5m | Added +604.3k |
| Divisadero Street Capital Management, LP 2.82% of their portfolio | 1.3m $120.7m | Added +1.1m |
| STATE STREET CORP 0.00% of their portfolio | 1.3m $114.8m | Added +607.3k |
| Capital World Investors 0.01% of their portfolio | 1.2m $105.0m | Added +102.1k |
| TWO SIGMA INVESTMENTS, LP 0.07% of their portfolio | 1.0m $92.0m | Added +53.7k |
| NEEDHAM INVESTMENT MANAGEMENT LLC 2.61% of their portfolio | 957.5k $86.9m | Added +570.0k |
| Jupiter Topco LLC 0.04% of their portfolio | 949.9k $86.2m | First filing |
| ROYCE & ASSOCIATES LP 0.62% of their portfolio | 842.3k $76.4m | Added +14.5k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio | 835.7k $75.8m | Added +814.3k |
| EMERALD ADVISERS, LLC 1.57% of their portfolio | 736.8k $66.9m | Added +213.8k |
| KING LUTHER CAPITAL MANAGEMENT CORP 0.27% of their portfolio | 716.9k $65.1m | Reduced -33.2k |
| Invesco Ltd. 0.00% of their portfolio | 667.9k $60.6m | Added +631.0k |
| LORD, ABBETT & CO. LLC 0.17% of their portfolio | 642.1k $58.3m | Added +227.7k |
| IES Holdings, Inc. 18.22% of their portfolio | 623.5k $56.6m | Added +55.0k |
| Thrivent Financial for Lutherans 0.09% of their portfolio | 608.0k $55.2m | Reduced -32.0k |
| GW&K Investment Management, LLC 0.43% of their portfolio | 601.5k $54.6m | New |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.02% of their portfolio | 568.5k $51.6m | Added +453.2k |
| First Eagle Investment Management, LLC 0.04% of their portfolio | 548.6k $49.8m | Added +306.1k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 492.5k $44.7m | Added +240.6k |
| UBS Group AG 0.01% of their portfolio | 475.2k $43.1m | Added +274.1k |
| EMERALD MUTUAL FUND ADVISERS TRUST 1.50% of their portfolio | 471.2k $42.8m | Added +157.2k |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.00% of their portfolio | 454.7k $41.3m | Added +216.9k |
| Legal & General Group Plc 0.01% of their portfolio | 445.9k $40.5m | Added +45.4k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 442.7k $40.2m | Added +195.2k |
| Assenagon Asset Management S.A. 0.03% of their portfolio | 439.6k $39.9m | New |
| Nuveen, LLC 0.01% of their portfolio | 414.2k $37.6m | Added +292.4k |
| VOYA INVESTMENT MANAGEMENT LLC 0.03% of their portfolio | 396.3k $36.0m | Added +391.2k |
| VANGUARD FIDUCIARY TRUST CO 0.01% of their portfolio | 379.7k $34.5m | Added +170.0k |
| OBERWEIS ASSET MANAGEMENT INC/ 0.67% of their portfolio | 358.1k $32.5m | Added +223.0k |
| DEUTSCHE BANK AG\ 0.01% of their portfolio | 335.8k $30.5m | Added +108.1k |
| VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. 0.23% of their portfolio | 327.3k $29.7m | New |
| Harvey Partners, LLC 1.96% of their portfolio | 311.1k $28.2m | New |
| KENNEDY CAPITAL MANAGEMENT LLC 0.46% of their portfolio | 284.3k $25.8m | Added +134.5k |
| MORGAN STANLEY 0.00% of their portfolio | 266.9k $24.2m | Reduced -83.9k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 266.2k $24.2m | Added +139.6k |
| Russell Investments Group, Ltd. 0.02% of their portfolio | 262.5k $23.8m | Added +148.0k |
| MILLENNIUM MANAGEMENT LLC 0.02% of their portfolio | 259.5k $23.5m | Added +247.7k |
| SEGALL BRYANT & HAMILL, LLC 0.28% of their portfolio | 259.2k $23.5m | Added +84.1k |
| NEW SOUTH CAPITAL MANAGEMENT INC 1.02% of their portfolio | 257.3k $23.3m | New |
| Rockefeller Capital Management L.P. 0.03% of their portfolio | 245.9k $22.3m | Reduced -8.5k |
| Engineers Gate Manager LP 0.29% of their portfolio | 243.2k $22.1m | Added +239.7k |
| Penn Capital Management Company, LLC 1.37% of their portfolio | 237.1k $21.6m | New |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 233.5k $21.2m | Added +157.2k |
| BESSEMER GROUP INC 0.03% of their portfolio | 220.1k $20.0m | Added +3.6k |
| LOOMIS SAYLES & CO L P 0.03% of their portfolio | 220.0k $20.0m | Reduced -9.1k |
| Swedbank AB 0.02% of their portfolio | 203.0k $18.4m | New |
| Amundi 0.00% of their portfolio | 198.1k $18.0m | Added +29.9k |
| BNP PARIBAS FINANCIAL MARKETS 0.01% of their portfolio | 198.0k $18.0m | Added +6.5k |
| Point72 Asset Management, L.P. 0.03% of their portfolio | 196.1k $17.8m | Added +37.1k |
| FIRST TRUST ADVISORS LP 0.01% of their portfolio | 169.9k $15.4m | Added +13.3k |
| Walleye Capital LLC 0.07% of their portfolio | 169.9k $15.4m | Added +131.4k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 167.0k $15.2m | Added +80.6k |
| Robeco Schweiz AG 0.24% of their portfolio | 165.2k $15.0m | Reduced -33.6k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.02% of their portfolio | 164.3k $14.9m | Added +153.9k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 160.9k $14.6m | Reduced -56.5k |
| Pier Capital, LLC 1.83% of their portfolio | 152.1k $13.8m | Added +1.8k |
| Allspring Global Investments Holdings, LLC 0.02% of their portfolio | 151.6k $13.8m | Added +4.9k |
| ESSEX INVESTMENT MANAGEMENT CO LLC 1.79% of their portfolio | 150.4k $13.6m | Reduced -6.8k |
| POLEN CAPITAL MANAGEMENT LLC 0.11% of their portfolio | 138.0k $12.5m | Reduced -5.3k |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 0.04% of their portfolio | 134.0k $12.2m | New |
| PEREGRINE CAPITAL MANAGEMENT LLC 0.39% of their portfolio | 132.4k $12.0m | Reduced -21.9k |
| AQR CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 129.8k $11.8m | Added +36.6k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.07% of their portfolio | 125.5k $11.4m | Reduced -6.1k |
| Informed Momentum Co LLC 0.98% of their portfolio | 120.7k $11.0m | New |
| MARTIN & CO INC /TN/ 1.58% of their portfolio | 111.4k $10.1m | Reduced -138.1k |
| Swiss National Bank 0.01% of their portfolio | 109.7k $10.0m | Added +49.8k |
| BARCLAYS PLC 0.00% of their portfolio | 109.1k $9.9m | Added +103.3k |
| Hodges Capital Management Inc. 0.65% of their portfolio | 107.8k $9.8m | New |
| INTRINSIC EDGE CAPITAL MANAGEMENT LLC 1.15% of their portfolio | 103.0k $9.3m | New |
| SEI INVESTMENTS CO 0.01% of their portfolio | 102.9k $9.3m | Reduced -8.4k |
| Universal- Beteiligungs- und Servicegesellschaft mbH 0.01% of their portfolio | 97.2k $8.8m | New |
| MARATHON CAPITAL MANAGEMENT 1.75% of their portfolio | 95.4k $8.7m | Reduced -2.9k |
| Granahan Investment Management, LLC 0.31% of their portfolio | 94.8k $8.6m | Added +2.1k |
| RBF Capital, LLC 0.35% of their portfolio | 92.8k $8.4m | Added +88.9k |
| Panoramic Capital, LLC 3.41% of their portfolio | 87.5k $7.9m | Added +20.9k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 84.3k $7.6m | Added +24.0k |
| GREAT LAKES ADVISORS, LLC 0.06% of their portfolio | 83.4k $7.6m | Reduced -7.7k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 83.4k $7.7m | Added +59.1k |
| Qube Research & Technologies Ltd 0.01% of their portfolio | 81.9k $7.4m | New |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO 0.02% of their portfolio | 81.7k $7.4m | New |
| De Lisle Partners LLP 0.81% of their portfolio | 81.4k $7.4m | New |
| Squarepoint Ops LLC 0.01% of their portfolio | 79.7k $7.2m | Reduced -85.6k |
| Alberta Investment Management Corp 0.04% of their portfolio | 78.4k $7.1m | New |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.01% of their portfolio | 76.2k $6.9m | Added +34.5k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 76.0k $6.9m | Added +52.6k |
| Legato Capital Management LLC 0.56% of their portfolio | 74.7k $6.8m | Added +14.0k |
| Peregrine Asset Advisers, Inc. 1.43% of their portfolio | 72.8k $6.6m | Reduced -1.1k |
| CREDIT AGRICOLE S A 0.02% of their portfolio | 69.1k $6.3m | Added +21.2k |
| Meros Investment Management, LP 1.96% of their portfolio | 68.1k $6.2m | New |
| Lisanti Capital Growth, LLC 1.34% of their portfolio | 67.3k $6.1m | Added +36.4k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 67.2k $6.1m | Added +31.1k |
| Calamos Advisors LLC 0.02% of their portfolio | 63.0k $5.7m | Added +4.9k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 62.0k $5.6m | Added +28.5k |