![John O’Hara](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
John O’Hara
Director of Finance/CFO at
WISEKEY INTERNATIONAL HOLDING AG
Net worth: 871 514 $ as of 2026-05-30
Profile
John O’Hara currently works at WISeKey International Holding Ltd., as Chief Financial Officer & Director from 2024 and SEALSQ Corp., as Chief Financial Officer & Executive Director from 2024.
Mr. O’Hara also formerly worked at Deloitte Consulting LP, as Finance Director from 2015 to 2017, Marsh & McLennan Cos., Inc., as Financial Controller from 2008 to 2015, Chelsea FC Holdings Ltd., as Group Accountant from 2004 to 2006, and Jesuit Worldwide Learning-Higher Education At The Margins Usa, as Global Financial Controller from 2017 to 2018.
Mr. O’Hara received his undergraduate degree from the University of Durham.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
SEALSQ CORP. 0.11% | 2026-06-04 | 250,431 ( 0.11% ) | 871 500 $ | 2026-05-30 |
| 2026-03-26 | 4 ( 0% ) | 14 $ | 2026-05-30 | |
| 2026-04-29 | 0 ( -.--% ) | - $ | 2026-05-30 |
John O’Hara active positions
| Companies | Position | Start |
|---|---|---|
| WISEKEY INTERNATIONAL HOLDING AG | Director of Finance/CFO | 2024-06-30 |
| SEALSQ CORP | Director of Finance/CFO | 2024-01-23 |
Former positions of John O’Hara
| Companies | Position | End |
|---|---|---|
Jesuit Worldwide Learning-Higher Education At The Margins Usa | Comptroller/Controller/Auditor | 2018-11-30 |
Deloitte Consulting LP
 Deloitte Consulting LP Miscellaneous Commercial ServicesCommercial Services Provides accounting and auditing services | Director of Finance/CFO | 2017-07-31 |
| MARSH & MCLENNAN COMPANIES | Comptroller/Controller/Auditor | 2015-02-28 |
Chelsea FC Holdings Ltd.
 Chelsea FC Holdings Ltd. Movies/EntertainmentConsumer Services Operates a football club | Comptroller/Controller/Auditor | 2006-11-30 |
Training of John O’Hara
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
40
1st degree connections
7
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 7 |
|---|---|
Marsh & McLennan Cos., Inc.
 Marsh & McLennan Cos., Inc. Insurance Brokers/ServicesFinance Provides risk management advisory and insurance services | Finance |
University of Durham
 University of Durham Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Chelsea FC Holdings Ltd.
Chelsea FC Holdings Ltd. Movies/EntertainmentConsumer Services Operates a football club | Consumer Services |
WISeKey International Holding Ltd.
 WISeKey International Holding Ltd. SemiconductorsElectronic Technology Offers digital security technology solutions | Electronic Technology |
Deloitte Consulting LP
Deloitte Consulting LP Miscellaneous Commercial ServicesCommercial Services Provides accounting and auditing services | Commercial Services |
Jesuit Worldwide Learning-Higher Education At The Margins Usa | |
SEALSQ Corp.
 SEALSQ Corp. SemiconductorsElectronic Technology Manufactures semiconductor chips, embedded firmware and hardware | Electronic Technology |
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