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David Lowden

Board Chair & Nomination Chair

N Chairman of Nomination Committee
R Remuneration Committee

ReadClose biography: David Lowden

David Lowden

Board Chair & Nomination Chair

Joined - October 2021

Relevant skills and experience

Industrial and distribution sectors
Financial and risk management
Operations
Strategy
M&A and financing
International business

Current external appointments

Senior Independent Director, Morgan Sindall plc
Chair, Capita PLC

Past appointments

Chair, PageGroup plc
Senior Independent Director, Berendsen plc
Chair, Huntsworth plc
Non-Executive Director, William Hill plc and Cable & Wireless Worldwide plc
Chief Executive, Taylor Nelson Sofres

Johnny Thomson

Chief Executive Officer

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Johnny Thomson

Chief Executive Officer

Joined - February 2019

Relevant skills and experience

B2B Industrial
Distribution and service sectors
Financial and risk management
Operations and customer service
Strategy
M&A and financing
International business

Current external appointments

Non-executive advisory role at TDR Capital LLP (TDR) and member of the Strategic Committee of TDR’s portfolio company, Applus+

Past appointments

Group Finance Director (Compass Group PLC)
Regional Managing Director, Latin America (Compass Group PLC)

Wilson Ng

Chief Financial Officer

ReadClose biography: Wilson Ng

Wilson Ng

Chief Financial Officer

Appointed - August 2025

Relevant skills and experience

Manufacturing and industrial products sectors
Financial and risk management
Strategy
Operational finance
M&A and financing
International business

Current external appointments

None

Past appointments

Divisional Finance Director (Steam Specialities), Spirax Group plc
VP Finance, GKN plc

Katie Bickerstaffe

Senior Independent Director

A Audit Committee
N Nomination Committee
R Remuneration Committee

ReadClose biography: Katie Bickerstaffe

Katie Bickerstaffe

Senior Independent Director

Joined - October 2024

Relevant skills and experience

Retail, services and FMCG sectors
Sales and marketing
Strategy
Operations and customer service
Organisational development
M&A and financing

Current external appointments

Non-Executive Director, J Sainsbury plc
Non-Executive Director and Remuneration Committee Chair, Barratt Redrow plc
Non-Executive Director, Aberdeen Group Plc
Senior Independent Director, England and Wales Cricket Board
Non-Executive Director, The Royal Marsden NHS Foundation Trust

Past appointments

Co-Chief Executive Officer at Marks & Spencer Group Plc
Executive Chair at SSE Energy Services
CEO Designate at SSE Plc
CEO UK & Ireland at Dixons Carphone Plc

Janice Stipp

Independent Non-Executive Director & Audit Chair

A Chairman of Audit Committee
N Nomination Committee

ReadClose biography: Janice Stipp

Janice Stipp

Independent Non-Executive Director & Audit Chair

Joined – January 2024

Relevant Skills and Experience

Industrial and services sectors
M&A and financing
International business
Financial and risk management
Organisational development
Strategy

Current external appointments

Independent Board Member and Audit Committee Chair, ArcBest Corporation
Non-Executive Director & Audit Committee Chair, Rotork Plc

Past appointments

Board Member, Michigan State University Research Foundation
Independent Board Member, Sappi Ltd
Independent Board Member, Commercial Vehicle Group Inc
Independent Board Member, NN Inc
Independent Board Member, PlyGem Holdings Inc

Jennifer Ward

Independent Non-Executive Director & Remuneration Chair

N Nomination Committee
R Chairman of Remuneration Committee

ReadClose biography: Jennifer Ward

Jennifer Ward

Independent Non-Executive Director & Remuneration Chair

Joined - June 2023

Relevant skills and experience

B2B industrial, services and retail sectors
Customer service
Sales and marketing
Organisational development
International business
Diversity, equity and inclusion

Current external appointments

Executive Director and Chief Talent, Culture and Communications Executive, Halma Plc

Past appointments

Senior Director, Human Resources, PayPal Inc.
SVP Learning & Leadership Development, Bank of America

Dean Finch

Independent Non-Executive Director

A Audit Committee
N Nomination Committee

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Dean Finch

Independent Non-Executive Director

Joined - May 2021

Relevant skills and experience

B2B industrial, services and retail sectors
Financial and risk management
Operations and customer service
Health and safety
M&A and financing
Strategy
International business

Current external appointments

Group Chief Executive, Persimmon PLC
Non-Executive Director, Home Builders Federation

Past appointments

Chief Executive Officer, National Express Group plc
Group Chief Executive, Tube Lines
Group Finance Director & Group Chief Operating Officer, FirstGroup plc

Geraldine Huse

Independent Non-Executive Director

N Nomination Committee
R Remuneration Committee

ReadClose biography: Geraldine Huse

Geraldine Huse

Independent Non-Executive Director

Joined - January 2020

Relevant skills and experience

Retail and FMCG sectors
Customer service
Sales and marketing
Diversity, equity & inclusion
Organisational development
International business

Current external appointments

None

Past appointments

Chief Executive Officer, P&G Central Europe and President, Procter & Gamble Canada
Chair of the Institute of Grocery Distribution

Ian El-Mokadem

Independent Non-Executive Director

A Audit Committee
N Nomination Committee

ReadClose biography: Ian El-Mokadem

Ian El-Mokadem

Independent Non-Executive Director

Joined - January 2025

Relevant skills and experience

B2B industrial and services sectors
Financial and risk management
Operations
Health and safety
M&A and financing
Strategy
International business
Technology-enabled business transformation

Current external appointments

Senior Advisor - Industrial & Business Services group, Warburg Pincus LLC
Non-Executive Director, Serco Group plc
Director, Roegate Consulting Ltd
Non-Executive Director, United Utilities Group plc

Past appointments

Chief Executive, RWS Holdings plc
Chief Executive, V.Group for Advent International
Chief Executive, Exova Group plc

Cheri Phyfer

Independent Non-Executive Director

R Remuneration Committee
N Nomination Committee

ReadClose biography: Cheri Phyfer

Cheri Phyfer

Independent Non-Executive Director

Joined - March 2026

Relevant skills and experience

B2B and B2C industrial and retail sectors
Operations and customer service
Organisational development
Sales and marketing
Diversity, equity & inclusion
International business
M&A and financing

Current external appointments

Independent Board Member, BlueScope Steel Ltd
Independent Board Member, O-I Glass Inc.
Independent Board Member, W.C. Bradley Co.
Trustee Director, Rock & Roll Hall of Fame
Trustee Director, Clemson University

Past appointments

Executive Vice President and Group President, Fortune Brands Innovations, Inc.
President of Consumer Group, The Sherwin-Williams Company

Anna Lawrence

Group General Counsel & Company Secretary

ReadClose biography: Anna Lawrence

Anna Lawrence

Group General Counsel & Company Secretary

Anna joined Diploma in May 2025 as Group General Counsel & Company Secretary. Prior to joining Diploma, Anna held senior legal positions at Rolls-Royce plc, Johnson Matthey plc and Kingfisher plc. Most recently, she was Group General Counsel & Company Secretary at Elementis plc. She trained and qualified as a solicitor at Allen & Overy (now A&O Shearman).

Johnny Thomson

Chief Executive Officer

ReadClose biography: Johnny Thomson

Johnny Thomson

Chief Executive Officer

Johnny was appointed Group Chief Executive Officer in February 2019. Johnny brings a proven track record of driving business growth within an international, decentralised Group. As CEO, Johnny has developed the Group’s strategy, culture and capability and overseen Diploma’s continued growth and performance. Johnny was previously Group CFO at Compass, having held a number of positions across the Group.

Wilson Ng

Chief Financial Officer

ReadClose biography: Wilson Ng

Wilson Ng

Chief Financial Officer

Wilson Ng was appointed Acting CFO in August 2025. Wilson joined Diploma in 2022 as Group Financial Controller and has over 20 years of international finance experience. Wilson joined Diploma from Spirax Group plc (formerly Spirax Sarco plc) where he served as a divisional Finance Director. Prior to that, he held various senior financial roles at GKN plc, including a tenure in Asia Pacific. Wilson is an ICAEW chartered accountant.

Donna Catley

Group HR Director

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Donna Catley

Group HR Director

Donna joined Diploma in September 2023 and leads the people, culture and ESG agenda across the Group. She brings with her a wealth of experience across multiple sectors, having worked at BP, Cisco Systems, Diageo and Accenture. Most recently she was the Chief People Officer at Compass Group UK&I. Throughout her career, Donna has lived in Russia, Germany, the US and Belgium

David Goode

CEO, Controls Sector

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David Goode

CEO, Controls Sector

David joined Diploma in April 2019 and is responsible for the performance of the Controls Sector businesses. David joined Diploma from Essentra where he was Managing Director for its EMEA components division. He also held senior leadership positions in Essentra's Specialty Tapes division across North America, Asia and Europe.

Neil Yazdani

CEO, North American Seals Sector

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Neil Yazdani

CEO, North American Seals Sector

Neil joined Diploma in 2019 having previously been a Director at Deloitte LLP. Neil has held a number of key roles within the Group, initially as Group Financial Controller before moving into the Controls Sector as CFO. Neil became CEO of the North American Seals Sector in April 2025.

Peter Soelberg

CEO, Life Sciences Sector

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Peter Soelberg

CEO, Life Sciences Sector

Peter joined Diploma in June 2022 to lead our European healthcare businesses and became Life Sciences Sector CEO in October 2023. Prior to joining Diploma Peter had more than 20 years of commercial experience in Life Sciences. His career has spanned major organisations in pharmaceuticals, biotech and medical devices, across multiple healthcare market segments. Peter has broad international experience and has lived and worked in established and developing markets across the globe.

Steve Sargeant

Group Corporate Development Director

ReadClose biography: Steve Sargeant

Steve Sargeant

Group Corporate Development Director

Steve has worked in M&A for over 20 years, initially in investment banking followed by corporate development roles at Bunzl and Sysco. Since joining the Group in September 2020, Steve has overseen the development of an international corporate development team and the acquisition of several strategically important businesses.

Anna Lawrence

Group General Counsel & Company Secretary

ReadClose biography: Anna Lawrence

Anna Lawrence

Group General Counsel & Company Secretary

Holly Gillis

Head of Investor Relations

ReadClose biography: Holly Gillis

Holly Gillis

Head of Investor Relations

Holly joined Diploma in November 2023 and leads investor relations and external communications. She has 20 years' experience in finance and corporate communications, most recently serving as Head of Investor Relations at The Go-Ahead Group plc and as Senior Director at Citigate Dewe Rogerson (CDR). Holly is an ACCA qualified accountant and a Non-Executive Director at the Investor Relations Society.