Our Management

Key Management

David Barrett


David co-founded SigmaRoc plc together with Max Vermorken and Charles Trigg and has been its Chairman since January 2017.

Max Vermorken


Max co-founded SigmaRoc plc together with David Barrett and Charles Trigg and has served as its CEO since August 2016.

Garth Palmer


Garth Palmer was Finance Director of SigmaRoc from inception until April 2020. In August 2021 Garth returned as a full-time executive and CFO.

Charles Trigg

Chief Technical Officer

Charles co-founded SigmaRoc plc together with David Barrett and Max Vermorken in August 2016 and has served as its Chief Technical Director.

Emmanuel Maes

ExCo Europe

Emmanuel joined SigmaRoc in 2019 and is the ExCo of our European arm. Previously he was CEO of Group De Cloedt.

Fons Vermorken

Chief Information Officer

Fons joined SigmaRoc at its founding in 2016 as a consultant, and now acts as its CIO.

Anthony Brockbank

General Counsel

Anthony is a qualified solicitor specialising in Corporate Finance. He acts as General Counsel for SigmaRoc.

Dean Masefield

Deputy CFO/Director of IR

Dean joined Ronez in 2017 and was the Finance Director of the Ronez platform until becoming SigmaRoc’s Finance Director in 2020. He now manages Investor Relations while acting as deputy CFO. 

Platform Managing Directors

Paul Gustavsson

ExCo Nordkalk

Paul is CEO of Nordkalk since 2019 and leads our Northern European platform since its integration. 

Mike Osborne

ExCo Channel Islands

Mike has been ExCo of the Ronez platform since SigmaRoc’s acquisition in 2017 and was previously managing director since 2006, where he was responsible for Ronez’s strategic direction.

Michael Roddy


Michael has been ExCo of SigmaRoc’s Precast Products Group platform since December 2017, during which time he has overseen the acquisition and integration of all platform entities.

Christophe Huyghebaert

ExCo Dimension Stone

Former commercial director of Heidelberg Cement, Christophe has joined SigmaRoc in 2021 as the ExCo of our dimension stone platform.

Nick Cleary

General Manager

Nick joined SigmaRoc in 2021 as the ExCo of our Quarry Products and Contracting Business in South Wales.

Dirk De Leus

ExCo Benelux

Dirk has over 30 years of experience in the construction industry in the aggregates, ready-mix concrete and cement markets in Belgium.

Supporting Management

Marcel Gestranius

CFO/deputy CEO Nordkalk

Marcel joined Nordkalk in 1998 and has since held various senior positions within finance and administration until becoming the company’s CFO in 2015.

Clint White

Director of Health & Safety

Clint White is responsible for group Health, Safety, Environment and Planning and has been with SigmaRoc since 2017. 

SigmaRoc to install carbon capture facility


RightCast Ltd RightCast Ltd We are pleased to welcome the RightCast team into SigmaRoc’s Precast