Ceco Environmental Corp has 12 Schedule 13D or 13G filings on record since 2025-07-16. 3 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Jason DeZwirek | 11.7% | 4,198,111 | SCHEDULE 13D/A, 2026-02-26 | 2026-02-23 |
| Fmr LLC | 7.7% | 4,524,438 | SCHEDULE 13G/A, 2026-08-06 | 2026-06-30 |
| BlackRock, Inc. | 6.3% | 2,221,551 | SCHEDULE 13G/A, 2025-07-16 | 2025-06-30 |
| The Vanguard Group | 4.99% | 1,780,596 | SCHEDULE 13G/A, 2026-01-30 | 2025-12-31 |
| Capital International Investors | 4.7% | 1,675,351 | SCHEDULE 13G/A, 2025-11-13 | 2025-09-30 |
| T. Rowe Price Investment Management, Inc. | 3.7% | 2,153,953 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| American Century Investment Management, Inc. | 3.6% | 2,088,421 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Hood River Capital Management LLC | 1.39% | 492,374 | SCHEDULE 13G/A, 2025-11-14 | 2025-09-30 |
Purpose of Transaction (Item 4)
Jason DeZwirek
Item 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 merger of the Surviving Corporation with and into Merger Sub LLC, with Merger Sub LLC continuing as the surviving entity (the "Surviving Company") (together with the First Merger, the "Mergers"). Concurrently with the execution of the Merger Agreement, on February 23, 2026, the Reporting Persons entered into a Voting Agreement with the Issuer and Thermon (the "Voting Agreement"), pursuant to which the Reporting Persons have agreed, among other things and subject to certain restrictions, (i) not to transfer any of the (A) 2,770,546 shares of Common Stock of which Icarus is a record owner, (B) 200,000 shares of Common Stock of which 0to100 is a record owner or (C) 4,198,111 of the shares of …The first part of Item 4 of the SCHEDULE 13D/A filed 2026-02-26; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-16 | BlackRock, Inc. | 6.3% | SCHEDULE 13G/A |
| 2025-08-06 | Fmr LLC | 6.2% | SCHEDULE 13G/A |
| 2025-10-30 | The Vanguard Group | 5.01% | SCHEDULE 13G |
| 2025-11-13 | Capital International Investors | 4.7% | SCHEDULE 13G/A |
| 2025-11-14 | Hood River Capital Management LLC | 1.39% | SCHEDULE 13G/A |
| 2026-01-30 | The Vanguard Group | 4.99% | SCHEDULE 13G/A |
| 2026-02-13 | American Century Investment Management, Inc. | 5.7% | SCHEDULE 13G |
| 2026-02-26 | Jason DeZwirek | 11.7% | SCHEDULE 13D/A |
| 2026-05-15 | T. Rowe Price Investment Management, Inc. | 6% | SCHEDULE 13G |
| 2026-08-06 | Fmr LLC | 7.7% | SCHEDULE 13G/A |
| 2026-08-14 | American Century Investment Management, Inc. | 3.6% | SCHEDULE 13G/A |
| 2026-08-14 | T. Rowe Price Investment Management, Inc. | 3.7% | SCHEDULE 13G/A |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.