Form 4 for CECO CECO ENVIRONMENTAL CORP

Accepted 2026-06-03 19:02:57 ET · period of report 2026-06-01 · accession 0001193125-26-255977 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
M	2026-06-03 19:02	2026-06-01	CECO	Harris-Peterson Candace	CHRO	A - Grant	—	+18.9K	18.9K	New	—

Purchase Sale Sale after option exercise All abbreviations

Every reported transaction

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2026-06-01	A	A	3,133	—	3,133	D	—	—	(F3) On May 12, 2026, the Reporting Person was granted an award of Thermon RSUs, which was assumed and converted into a Converted RSU Award that vests in equal installments on each of June 1, 2027, June 1, 2028 and June 1, 2029. (F1) On June 1, 2026 (the "Closing Date"), pursuant to an Agreement and Plan of Merger, dated as of February 23, 2026 (the "Merger Agreement"), by and among CECO Environmental Corp. (the "Issuer"), Thermon Group Holdings, Inc. ("Thermon"), Longhorn Merger Sub, Inc. ("Merger Sub, Inc.") and Longhorn Merger Sub LLC ("Merger Sub LLC"), (i) Merger Sub, Inc. merged with and into Thermon, with Thermon continuing as a wholly-owned subsidiary of the Issuer and the surviving corporation of the merger (the "First Merger") and (ii) Thermon, as the surviving corporation of the First Merger, merged with and into Merger Sub LLC, with Merger Sub LLC being the surviving entity of the merger. (F2) (Continued from Footnote 1) Pursuant to the Merger Agreement, at the effective time of the First Merger (the "Effective Time"), each outstanding restricted stock unit of Thermon (each a "Thermon RSU") and outstanding award of performance units (each a "Thermon PU"), was automatically assumed by the Issuer and converted into a restricted stock unit with respect to a number of shares of the Issuer's common stock equal to the product of (x) the number of shares of Thermon's common stock subject to such Thermon RSU or Thermon PU and (y) 0.8110 (each, a "Converted RSU Award").
2	Common	Common Stock	2026-06-01	A	A	2,735	—	5,868	D	—	—	(F4) On June 1, 2025, the Reporting Person was granted an award of Thermon RSUs, which was assumed and converted into a Converted RSU Award that vested as to one-third on June 1, 2026 and vests as to one-third on each of June 1, 2027 and June 1, 2028. (F1) On June 1, 2026 (the "Closing Date"), pursuant to an Agreement and Plan of Merger, dated as of February 23, 2026 (the "Merger Agreement"), by and among CECO Environmental Corp. (the "Issuer"), Thermon Group Holdings, Inc. ("Thermon"), Longhorn Merger Sub, Inc. ("Merger Sub, Inc.") and Longhorn Merger Sub LLC ("Merger Sub LLC"), (i) Merger Sub, Inc. merged with and into Thermon, with Thermon continuing as a wholly-owned subsidiary of the Issuer and the surviving corporation of the merger (the "First Merger") and (ii) Thermon, as the surviving corporation of the First Merger, merged with and into Merger Sub LLC, with Merger Sub LLC being the surviving entity of the merger. (F2) (Continued from Footnote 1) Pursuant to the Merger Agreement, at the effective time of the First Merger (the "Effective Time"), each outstanding restricted stock unit of Thermon (each a "Thermon RSU") and outstanding award of performance units (each a "Thermon PU"), was automatically assumed by the Issuer and converted into a restricted stock unit with respect to a number of shares of the Issuer's common stock equal to the product of (x) the number of shares of Thermon's common stock subject to such Thermon RSU or Thermon PU and (y) 0.8110 (each, a "Converted RSU Award").
3	Common	Common Stock	2026-06-01	A	A	6,313	—	12,181	D	—	—	(F5) On June 1, 2025, the Reporting Person was granted an award of Thermon PUs, which was assumed and converted into a Converted RSU Award that vests in full on March 31, 2028. (F1) On June 1, 2026 (the "Closing Date"), pursuant to an Agreement and Plan of Merger, dated as of February 23, 2026 (the "Merger Agreement"), by and among CECO Environmental Corp. (the "Issuer"), Thermon Group Holdings, Inc. ("Thermon"), Longhorn Merger Sub, Inc. ("Merger Sub, Inc.") and Longhorn Merger Sub LLC ("Merger Sub LLC"), (i) Merger Sub, Inc. merged with and into Thermon, with Thermon continuing as a wholly-owned subsidiary of the Issuer and the surviving corporation of the merger (the "First Merger") and (ii) Thermon, as the surviving corporation of the First Merger, merged with and into Merger Sub LLC, with Merger Sub LLC being the surviving entity of the merger. (F2) (Continued from Footnote 1) Pursuant to the Merger Agreement, at the effective time of the First Merger (the "Effective Time"), each outstanding restricted stock unit of Thermon (each a "Thermon RSU") and outstanding award of performance units (each a "Thermon PU"), was automatically assumed by the Issuer and converted into a restricted stock unit with respect to a number of shares of the Issuer's common stock equal to the product of (x) the number of shares of Thermon's common stock subject to such Thermon RSU or Thermon PU and (y) 0.8110 (each, a "Converted RSU Award").
4	Common	Common Stock	2026-06-01	A	A	1,401	—	13,582	D	—	—	(F6) On June 1, 2024, the Reporting Person was granted an award of Thermon RSUs, which was assumed and converted into a Converted RSU Award that vested as to one-half on June 1, 2026 and vests as to one-half on June 1, 2027. (F1) On June 1, 2026 (the "Closing Date"), pursuant to an Agreement and Plan of Merger, dated as of February 23, 2026 (the "Merger Agreement"), by and among CECO Environmental Corp. (the "Issuer"), Thermon Group Holdings, Inc. ("Thermon"), Longhorn Merger Sub, Inc. ("Merger Sub, Inc.") and Longhorn Merger Sub LLC ("Merger Sub LLC"), (i) Merger Sub, Inc. merged with and into Thermon, with Thermon continuing as a wholly-owned subsidiary of the Issuer and the surviving corporation of the merger (the "First Merger") and (ii) Thermon, as the surviving corporation of the First Merger, merged with and into Merger Sub LLC, with Merger Sub LLC being the surviving entity of the merger. (F2) (Continued from Footnote 1) Pursuant to the Merger Agreement, at the effective time of the First Merger (the "Effective Time"), each outstanding restricted stock unit of Thermon (each a "Thermon RSU") and outstanding award of performance units (each a "Thermon PU"), was automatically assumed by the Issuer and converted into a restricted stock unit with respect to a number of shares of the Issuer's common stock equal to the product of (x) the number of shares of Thermon's common stock subject to such Thermon RSU or Thermon PU and (y) 0.8110 (each, a "Converted RSU Award").
5	Common	Common Stock	2026-06-01	A	A	4,679	—	18,261	D	—	—	(F7) On June 1, 2024, the Reporting Person was granted an award of Thermon PUs, which was assumed and converted into a Converted RSU Award that vests in full on March 31, 2027. (F1) On June 1, 2026 (the "Closing Date"), pursuant to an Agreement and Plan of Merger, dated as of February 23, 2026 (the "Merger Agreement"), by and among CECO Environmental Corp. (the "Issuer"), Thermon Group Holdings, Inc. ("Thermon"), Longhorn Merger Sub, Inc. ("Merger Sub, Inc.") and Longhorn Merger Sub LLC ("Merger Sub LLC"), (i) Merger Sub, Inc. merged with and into Thermon, with Thermon continuing as a wholly-owned subsidiary of the Issuer and the surviving corporation of the merger (the "First Merger") and (ii) Thermon, as the surviving corporation of the First Merger, merged with and into Merger Sub LLC, with Merger Sub LLC being the surviving entity of the merger. (F2) (Continued from Footnote 1) Pursuant to the Merger Agreement, at the effective time of the First Merger (the "Effective Time"), each outstanding restricted stock unit of Thermon (each a "Thermon RSU") and outstanding award of performance units (each a "Thermon PU"), was automatically assumed by the Issuer and converted into a restricted stock unit with respect to a number of shares of the Issuer's common stock equal to the product of (x) the number of shares of Thermon's common stock subject to such Thermon RSU or Thermon PU and (y) 0.8110 (each, a "Converted RSU Award").
6	Common	Common Stock	2026-06-01	A	A	625	—	18,886	D	—	—	(F8) On June 1, 2023, the Reporting Person was granted an award of Thermon RSUs, which was assumed and converted into a fully vested Converted RSU Award. (F1) On June 1, 2026 (the "Closing Date"), pursuant to an Agreement and Plan of Merger, dated as of February 23, 2026 (the "Merger Agreement"), by and among CECO Environmental Corp. (the "Issuer"), Thermon Group Holdings, Inc. ("Thermon"), Longhorn Merger Sub, Inc. ("Merger Sub, Inc.") and Longhorn Merger Sub LLC ("Merger Sub LLC"), (i) Merger Sub, Inc. merged with and into Thermon, with Thermon continuing as a wholly-owned subsidiary of the Issuer and the surviving corporation of the merger (the "First Merger") and (ii) Thermon, as the surviving corporation of the First Merger, merged with and into Merger Sub LLC, with Merger Sub LLC being the surviving entity of the merger. (F2) (Continued from Footnote 1) Pursuant to the Merger Agreement, at the effective time of the First Merger (the "Effective Time"), each outstanding restricted stock unit of Thermon (each a "Thermon RSU") and outstanding award of performance units (each a "Thermon PU"), was automatically assumed by the Issuer and converted into a restricted stock unit with respect to a number of shares of the Issuer's common stock equal to the product of (x) the number of shares of Thermon's common stock subject to such Thermon RSU or Thermon PU and (y) 0.8110 (each, a "Converted RSU Award").