[Form 4] CECO ENVIRONMENTAL CORP Insider Trading Activity

Rhea-AI Filing Summary

CECO Environmental Corp director Jason Dezwirek reported a stock grant on Common Stock. He received an award of 2,215 shares at a price of $0.0000 per share, characterized as a grant or other acquisition, with these shares scheduled to vest on May 15, 2027.

Following this grant, his direct holdings in CECO Environmental Common Stock total 1,236,080 shares. The filing also lists indirect holdings of 200,000 shares held by 0to100 Inc. and 2,770,546 shares held by Icarus Investment Corp., where he is an officer and disclaims beneficial ownership except for his pecuniary interest.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider DEZWIREK JASON

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	2,215	$0.00	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 1,236,080 shares (Direct, null); Common Stock — 2,770,546 shares (Indirect, By Icarus Investment Corp.)

Footnotes (1)

1. Shares will vest on May 15, 2027. Reporting person is an officer of Icarus Investment Corp. and disclaims beneficial ownership except to the extent of his pecuniary interest therein.

Key Figures

Stock grant size: 2,215 shares Grant price: $0.0000 per share Direct holdings after grant: 1,236,080 shares +3 more

6 metrics

Stock grant size 2,215 shares Common Stock grant to director on 2026-06-01

Grant price $0.0000 per share Reported price for granted Common Stock

Direct holdings after grant 1,236,080 shares Common Stock directly held by Jason Dezwirek after transaction

Indirect holdings via 0to100 Inc. 200,000 shares Common Stock held indirectly by 0to100 Inc.

Indirect holdings via Icarus Investment Corp. 2,770,546 shares Common Stock held indirectly by Icarus Investment Corp.

Vesting date of grant May 15, 2027 Vesting date for 2,215-share award

Key Terms

Grant, award, or other acquisition, beneficial ownership, pecuniary interest, vest

4 terms

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

beneficial ownership financial

"disclaims beneficial ownership except to the extent of his pecuniary interest"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest financial

"disclaims beneficial ownership except to the extent of his pecuniary interest therein"

vest financial

"Shares will vest on May 15, 2027."

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

DEZWIREK JASON

(Last) (First) (Middle)

5080 SPECTRUM DRIVE

SUITE 800E

(Street)

ADDISON TEXAS 75001

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
CECO ENVIRONMENTAL CORP [ CECO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	06/01/2026		A		2,215(1)	A	$0	1,236,080	D
Common Stock								2,770,546	I	By Icarus Investment Corp.(2)
Common Stock								200,000	I	By 0to100 Inc.

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Shares will vest on May 15, 2027.

2. Reporting person is an officer of Icarus Investment Corp. and disclaims beneficial ownership except to the extent of his pecuniary interest therein.

Remarks:

Exhibit 24: Power of Attorney

	/s/ Kiril Kovachev as Attorney-in-Fact for Jason DeZwirek	06/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)