COO changes

Chief operating officer appointments and departures from SEC 8-K filings.

Updated Nov 6, 2026

COO changes, last 12 months

139

Appointments

Last 12 months

Departures

Last 12 months

Other roles

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Appointments and departures per month

December 2025 to November 2026

COO appointments and departures per month
Month	Appointments	Departures
December 2025	0	0
January 2026	0	0
February 2026	0	0
March 2026	0	0
April 2026	0	0
May 2026	0	0
June 2026	0	0
July 2026	0	0
August 2026	25	2
September 2026	33	7
October 2026	16	6
November 2026	9	1

Sectors with the most COO changes

Last 12 months

Sectors with the most COO changes, last 12 months
Sector	COO changes
Banking and finance	8
Biotechnology	4
Restaurants	3
Electronics	2
Energy	2
Software	2
Aerospace	1
Industrial components	1
Insurance	1
Professional services	1

COO changes
Filing date	Company	Person	Change	Effective date	Source
Sep 28, 2026	QUANTUM CORP /DE/	James C. Clancy	Appointed	Sep 28, 2026	SEC 8-K
Sep 28, 2026	StandardAero, Inc.	Kimberly Ernzen	Departed	Sep 28, 2026	SEC 8-K
Sep 29, 2026	Arrive AI Inc.	Mark Hamm	Departed	Oct 2, 2026	SEC 8-K
Sep 29, 2026	Larimar Therapeutics, Inc.	John B. Harlow, Jr.	Appointed	Sep 29, 2026	SEC 8-K
Sep 29, 2026	PLAINS ALL AMERICAN PIPELINE LP	Dean Liollio	Appointed	Oct 2, 2026	SEC 8-K
Sep 29, 2026	PLAINS ALL AMERICAN PIPELINE LP	Chris Chandler	Departed	Oct 2, 2026	SEC 8-K
Sep 29, 2026	PLAINS GP HOLDINGS LP	Dean Liollio	Appointed	Oct 2, 2026	SEC 8-K
Sep 29, 2026	PLAINS GP HOLDINGS LP	Chris Chandler	Departed	Oct 2, 2026	SEC 8-K
Sep 30, 2026	DigitalBridge Group, Inc.	Liam Stewart	Appointed	n/a	SEC 8-K
Sep 30, 2026	Moderna, Inc.	Juan Andres	Appointed	Oct 5, 2026	SEC 8-K
Sep 30, 2026	Vivakor, Inc.	Leslie D. Patterson	Departed	Sep 24, 2026	SEC 8-K
Oct 1, 2026	BEYOND MEAT, INC.	John Boken	Departed	Sep 30, 2026	SEC 8-K
Oct 1, 2026	KIMBERLY CLARK CORP	Russell Torres	Departed	Nov 2, 2026	SEC 8-K
Oct 2, 2026	AMERICAN COASTAL INSURANCE Corp	Christopher Griffith	Departed	Oct 1, 2026	SEC 8-K
Oct 2, 2026	ChronoScale Holdings Corp	Jason C. Jones	Departed	Sep 30, 2026	SEC 8-K
Oct 2, 2026	NOCOPI TECHNOLOGIES INC/MD/	Terry Stovold	Departed	Oct 1, 2026	SEC 8-K
Oct 6, 2026	AVIAT NETWORKS, INC.	Khashayar “Hash” Pakbaz	Appointed	Oct 5, 2026	SEC 8-K
Oct 6, 2026	Powerus Corp	Colin Chisholm	Appointed	Oct 1, 2026	SEC 8-K
Oct 6, 2026	Walker & Dunlop, Inc.	Stephen P. Theobald	Departed	Mar 31, 2027	SEC 8-K
Oct 7, 2026	BOSTON SCIENTIFIC CORP	Joe Fitzgerald	Appointed	Jan 1, 2027	SEC 8-K

Sort:Filing date ↑Company

QUANTUM CORP /DE/Appointed
James C. Clancy COO
Filed Sep 28, 2026Effective Sep 28, 2026SEC 8-K
StandardAero, Inc.Departed
Kimberly Ernzen COO
Filed Sep 28, 2026Effective Sep 28, 2026SEC 8-K
Arrive AI Inc.Departed
Mark Hamm COO
Filed Sep 29, 2026Effective Oct 2, 2026SEC 8-K
Larimar Therapeutics, Inc.Appointed
John B. Harlow, Jr. COO
Filed Sep 29, 2026Effective Sep 29, 2026SEC 8-K
PLAINS ALL AMERICAN PIPELINE LPAppointed
Dean Liollio COO
Filed Sep 29, 2026Effective Oct 2, 2026SEC 8-K
PLAINS ALL AMERICAN PIPELINE LPDeparted
Chris Chandler COO
Filed Sep 29, 2026Effective Oct 2, 2026SEC 8-K
PLAINS GP HOLDINGS LPAppointed
Dean Liollio COO
Filed Sep 29, 2026Effective Oct 2, 2026SEC 8-K
PLAINS GP HOLDINGS LPDeparted
Chris Chandler COO
Filed Sep 29, 2026Effective Oct 2, 2026SEC 8-K
DigitalBridge Group, Inc.Appointed
Liam Stewart COO
Filed Sep 30, 2026SEC 8-K
Moderna, Inc.Appointed
Juan Andres COO
Filed Sep 30, 2026Effective Oct 5, 2026SEC 8-K
Vivakor, Inc.Departed
Leslie D. Patterson COO
Filed Sep 30, 2026Effective Sep 24, 2026SEC 8-K
BEYOND MEAT, INC.Departed
John Boken COO
Filed Oct 1, 2026Effective Sep 30, 2026SEC 8-K
KIMBERLY CLARK CORPDeparted
Russell Torres COO
Filed Oct 1, 2026Effective Nov 2, 2026SEC 8-K
AMERICAN COASTAL INSURANCE CorpDeparted
Christopher Griffith COO
Filed Oct 2, 2026Effective Oct 1, 2026SEC 8-K
ChronoScale Holdings CorpDeparted
Jason C. Jones COO
Filed Oct 2, 2026Effective Sep 30, 2026SEC 8-K
NOCOPI TECHNOLOGIES INC/MD/Departed
Terry Stovold COO
Filed Oct 2, 2026Effective Oct 1, 2026SEC 8-K
AVIAT NETWORKS, INC.Appointed
Khashayar “Hash” Pakbaz COO
Filed Oct 6, 2026Effective Oct 5, 2026SEC 8-K
Powerus CorpAppointed
Colin Chisholm COO
Filed Oct 6, 2026Effective Oct 1, 2026SEC 8-K
Walker & Dunlop, Inc.Departed
Stephen P. Theobald COO
Filed Oct 6, 2026Effective Mar 31, 2027SEC 8-K
BOSTON SCIENTIFIC CORPAppointed
Joe Fitzgerald COO
Filed Oct 7, 2026Effective Jan 1, 2027SEC 8-K