Comparable stake leader
Jason DeZwirek
SEC ownership of CECO ENVIRONMENTAL CORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000003197.
Disclosed value leader
Jason DeZwirek
Comparable rows
50/50
Latest evidence
08 Jun 2026
- Public ticker
- CECO on Nasdaq
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Jason DeZwirek
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Jason DeZwirek
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
08 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000003197
- Issuer location
- Addison, TX
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of CECO ENVIRONMENTAL CORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Jason DeZwirek
Disclosed value leader
Jason DeZwirek
Comparable rows
50/50
Latest evidence
08 Jun 2026
13D/G
3/4/5
13F
Lead comparable stake: 12%
13D/G row: Jason DeZwirek
Showing 1-8 of 50 holder rows.
Quick read
Jason DeZwirek leads the comparable SEC ownership view at 12%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Jason DeZwirek's linked filing trail.
Comparable ownership
Top 5
Jason DeZwirek
12%
BlackRock, Inc.
6.3%
FMR LLC
6.2%
T. Rowe Price Investment Manageme...
6%
AMERICAN CENTURY INVESTMENT MANAG...
5.7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Jason DeZwirek |
13D/G
3/4/5
Director
|
12%
|
$259,443,260
4,198,111 shares
|
$0 | 23 Feb 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
6.3%
from 13D/G
|
$136,156,803
2,285,277 shares
|
— | 31 Mar 2026 |
| FMR LLC |
13F
13D/G
Company
|
6.2%
from 13D/G
|
$138,755,157
2,328,888 shares
|
— | 31 Mar 2026 |
| T. Rowe Price Investment Management, Inc. |
13D/G
13F
Company
|
6%
|
$138,612,562
2,131,845 shares
|
$0 | 31 Mar 2026 |
| AMERICAN CENTURY INVESTMENT MANAGEMENT INC |
13D/G
|
5.7%
|
$125,967,682
2,038,312 shares
|
$0 | 31 Dec 2025 |
| VANGUARD GROUP INC |
13D/G
The Vanguard Group
|
5%
|
$106,568,849
1,780,596 shares
|
+$588,925 | 31 Dec 2025 |
| Capital International Investors |
13D/G
|
4.7%
|
$85,777,971
1,675,351 shares
|
$0 | 30 Sep 2025 |
| DIMENSIONAL FUND ADVISORS LP |
13F
13D/G
Company
|
3.6%
from 13D/G
|
$53,812,769
903,291 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$18,085,302.
Buys
$2,978,353
Insiders: 1
Sells
$21,063,654
Insiders: 4
Net
-$18,085,302
Shares: -388,718
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 42,500
Shares: 431,218
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 35,000 | 11,218 | $2,638,428 | $830,145 | +$1,808,283 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 98,101 | $0 | $4,949,127 | -$4,949,127 |
| 9-12 | 7,500 | 321,899 | $339,925 | $15,284,382 | -$14,944,457 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 23 reporting-owner rows connected to CECO ENVIRONMENTAL CORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
23
Largest Forms 3/4/5 holder
Jason DeZwirek
Net 12M change
-$18,085,302
Latest report
08 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Jason DeZwirek | Director | $250,630,776 | -$4,298,327 | -1.7% | Median | 01 Jun 2026 |
| Todd R. Gleason | Chief Executive Officer, Director | $39,998,094 | -$15,104,936 | -27% | Mixed | 31 Mar 2026 |
| Richard F. Wallman | Director | $22,010,459 | +$2,978,353 | +16% | Mixed | 01 Jun 2026 |
| Valerie Gentile Sachs | Director | $6,275,799 | Median | 01 Jun 2026 | ||
| Peter K. Johansson | SVP, Chief Financial Officer | $5,967,251 | Mixed | 31 Mar 2026 | ||
| Claudio A. Mannarino | Director | $4,866,604 | -$830,247 | -15% | Mixed | 01 Jun 2026 |
| Jonathan Pollack | Director | $4,190,257 | Mixed | 05 Aug 2021 | ||
| Matthew Eckl | Chief Financial Officer | $4,020,389 | Mixed | 15 Mar 2022 | ||
| Munish Nanda | Director | $3,827,776 | -$830,145 | -18% | Median | 01 Jun 2026 |
| Joycelynn Watkins-Asiyanbi | Title: Chief Administrative and Legal Officer | $3,295,090 | Mixed | 27 Jun 2025 | ||
| David B. Liner | Director | $2,492,610 | Mixed | 15 Mar 2023 | ||
| Robert E. Knowling Jr. | Director | $2,467,783 | Mixed | 01 Jun 2026 | ||
| Marcus J. George | Director | $2,317,959 | Median | 01 Jun 2026 | ||
| Ramesh Nuggihalli | Chief Operating Officer | $1,560,076 | Mixed | 31 Mar 2023 | ||
| Eric M. Goldberg | Director | $1,463,796 | Mixed | 25 May 2021 | ||
| Alyson Noel Gregory | General Counsel | $1,377,687 | Mixed | 31 Mar 2026 | ||
| Laurie Siegel | Director | $1,318,684 | Median | 01 Jun 2026 | ||
| Candace Harris-Peterson | Chief Human Resources Officer | $1,310,223 | Median | 08 Jun 2026 | ||
| Paul M. Gohr | Chief Accounting Officer | $1,151,819 | Mixed | 31 Mar 2023 | ||
| Chasity Henry | Officer | $1,032,255 | Mixed | 10 Nov 2021 |
Recent insider transactions for CECO ENVIRONMENTAL CORP
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Candace Harris-Peterson | CECO | Common Stock | Award | 16.4% | 3,105 | 21,991 | 08 Jun 2026 | Direct | ||
| Valerie Gentile Sachs | CECO | Common Stock | Award | 3.12% | 3,190 | 105,334 | 01 Jun 2026 | Direct | ||
| Richard F. Wallman | CECO | Common Stock | Purchase | 23.4% | $1,536,938 | $76.85 | 20,000 | 105,500 | 01 Jun 2026 | By spouse |
| Richard F. Wallman | CECO | Common Stock | Award | 1.5% | 3,443 | 233,352 | 01 Jun 2026 | Direct | ||
| Laurie Siegel | CECO | Common Stock | Award | 11.1% | 2,215 | 22,133 | 01 Jun 2026 | Direct | ||
| Robert E. Knowling Jr. | CECO | Common Stock | Award | 20.4% | 2,215 | 13,077 | 01 Jun 2026 | Direct | ||
| Munish Nanda | CECO | Common Stock | Award | 3.57% | 2,215 | 64,246 | 01 Jun 2026 | Direct | ||
| Claudio A. Mannarino | CECO | Common Stock | Award | 1.43% | 1,108 | 78,697 | 01 Jun 2026 | Direct | ||
| Claudio A. Mannarino | CECO | Restricted Stock Units | Award | 18.4% | 1,107 | 7,113 | 01 Jun 2026 | Direct | ||
| Jason DeZwirek | CECO | Common Stock | Award | 0.18% | 2,215 | 1,236,080 | 01 Jun 2026 | Direct | ||
| Candace Harris-Peterson | CECO | Common Stock | Award | 18,886 | 18,886 | 01 Jun 2026 | Direct | |||
| Marcus J. George | CECO | Common Stock | Award | 38,905 | 38,905 | 01 Jun 2026 | Direct | |||
| Victor L. Richey Jr. | CECO | Common Stock | Award | 6,378 | 6,378 | 01 Jun 2026 | Direct | |||
| Victor L. Richey Jr. | CECO | Restricted Stock Units | Award | 2,215 | 2,215 | 01 Jun 2026 | Direct | |||
| Munish Nanda | CECO | Common Stock | Sale | -15.3% | $830,145 | $74.00 | -11,218 | 62,031 | 01 May 2026 | Direct |
| Richard F. Wallman | CECO | Common Stock | Purchase | 6.21% | $368,990 | $73.80 | 5,000 | 85,500 | 29 Apr 2026 | By spouse |
| Richard F. Wallman | CECO | Common Stock | Purchase | 4.55% | $732,500 | $73.25 | 10,000 | 229,909 | 29 Apr 2026 | Direct |
| Peter K. Johansson | CECO | Common Stock | Tax liability | -0.91% | -653 | 70,726 | 31 Mar 2026 | Direct | ||
| Todd R. Gleason | CECO | Common Stock | Tax liability | -0.47% | -2,110 | 450,688 | 31 Mar 2026 | Direct | ||
| Alyson Noel Gregory | CECO | Common Stock | Tax liability | -0.75% | -175 | 23,019 | 31 Mar 2026 | Direct | ||
| Alyson Noel Gregory | CECO | Common Stock | Tax liability | -0.6% | -139 | 23,194 | 17 Mar 2026 | Direct | ||
| Kiril Kovachev | CECO | Common Stock | Tax liability | -2.08% | -346 | 16,261 | 17 Mar 2026 | Direct | ||
| Peter K. Johansson | CECO | Common Stock | Tax liability | -2.15% | -1,570 | 71,379 | 17 Mar 2026 | Direct | ||
| Alyson Noel Gregory | CECO | Common Stock | Award | 15.6% | 3,155 | 23,333 | 16 Mar 2026 | Direct | ||
| Kiril Kovachev | CECO | Common Stock | Award | 11.8% | 1,753 | 16,607 | 16 Mar 2026 | Direct | ||
| Peter K. Johansson | CECO | Common Stock | Award | 5.72% | 3,944 | 72,949 | 16 Mar 2026 | Direct | ||
| Todd R. Gleason | CECO | Stock Option (right to buy) | Award | 17,563 | 17,563 | 16 Mar 2026 | Direct | |||
| Alyson Noel Gregory | CECO | Common Stock | Tax liability | -0.74% | -150 | 20,178 | 15 Mar 2026 | Direct | ||
| Kiril Kovachev | CECO | Common Stock | Tax liability | -2.49% | -380 | 14,854 | 15 Mar 2026 | Direct | ||
| Peter K. Johansson | CECO | Common Stock | Tax liability | -8.85% | -6,698 | 69,005 | 15 Mar 2026 | Direct | ||
| Peter K. Johansson | CECO | Common Stock | Award | 27% | 16,083 | 75,703 | 15 Mar 2026 | Direct | ||
| Todd R. Gleason | CECO | Common Stock | Tax liability | -6.12% | -29,535 | 452,798 | 15 Mar 2026 | Direct | ||
| Todd R. Gleason | CECO | Common Stock | Award | 18.4% | 75,055 | 482,333 | 15 Mar 2026 | Direct | ||
| Todd R. Gleason | CECO | Common Stock | Tax liability | -0.87% | -3,557 | 407,278 | 07 Mar 2026 | Direct | ||
| Alyson Noel Gregory | CECO | Common Stock | Tax liability | -1.39% | -287 | 20,328 | 07 Mar 2026 | Direct | ||
| Alyson Noel Gregory | CECO | Common Stock | Award | 69.7% | 8,465 | 20,615 | 15 Jan 2026 | Direct | ||
| Todd R. Gleason | CECO | Common Stock | Sale | -19.3% | $4,949,127 | $50.45 | -98,101 | 410,835 | 22 Sep 2025 | Direct |
| Todd R. Gleason | CECO | Common Stock | Options Exercise | 23.9% | 98,101 | 508,936 | 22 Sep 2025 | Direct | ||
| Todd R. Gleason | CECO | Stock Option (right to buy) | Options Exercise | -14.1% | -98,101 | 598,204 | 22 Sep 2025 | Direct | ||
| Todd R. Gleason | CECO | Common Stock | Sale | -19.9% | $5,025,669 | $49.32 | -101,899 | 410,835 | 19 Sep 2025 | Direct |
| Todd R. Gleason | CECO | Common Stock | Options Exercise | 24.8% | 101,899 | 512,734 | 19 Sep 2025 | Direct | ||
| Todd R. Gleason | CECO | Common Stock | Sale | -19.6% | $5,130,140 | $51.30 | -100,000 | 410,835 | 18 Sep 2025 | Direct |
| Todd R. Gleason | CECO | Common Stock | Options Exercise | 24.3% | 100,000 | 510,835 | 18 Sep 2025 | Direct | ||
| Todd R. Gleason | CECO | Stock Option (right to buy) | Options Exercise | -22.5% | -201,899 | 696,305 | 18 Sep 2025 | Direct | ||
| Peter K. Johansson | CECO | Restricted Stock Units | Award | 30,000 | 30,000 | 12 Sep 2025 | Direct | |||
| Richard F. Wallman | CECO | Common Stock | Purchase | 3.87% | $140,800 | $46.93 | 3,000 | 80,500 | 05 Sep 2025 | By spouse |
| Richard F. Wallman | CECO | Common Stock | Purchase | 1.97% | $66,375 | $44.25 | 1,500 | 77,500 | 29 Aug 2025 | By spouse |
| Richard F. Wallman | CECO | Common Stock | Purchase | 1.38% | $132,750 | $44.25 | 3,000 | 219,909 | 29 Aug 2025 | Direct |
| Peter K. Johansson | CECO | Common Stock | Tax liability | -3.72% | -2,302 | 59,620 | 15 Aug 2025 | Direct | ||
| Jason DeZwirek | CECO | Common Stock | Sale | -13% | $1,306,170 | $43.54 | -30,000 | 200,000 | 31 Jul 2025 | By 0to100 Inc. |
* marks a reported price that did not pass the local price check.