David Barrett

Founder at SIGMAROC PLC

Net worth: 9 M $ as of 2026-06-29

69 year

32 connections

Non-Energy Minerals

Finance

Transportation

Profile

David Kenneth Barrett is the founder of London Concrete Ltd, founded in 1997.
Mr. Barrett is the founder of SigmaRoc Plc, founded in 2004, and holds the title of Executive Chairman since 2016.
Mr. Barrett currently holds the position of Director at GDH (Holdings) Ltd. since 2019, Director at Thames Recycling Ltd. since 2013, Director at Capital Concrete Ltd., Director at SigmaFin Ltd. since 2017, and Director at Thames Aggregates Ltd.

Known holdings in public companies

Company	Date	Number of shares	Valuation	Valuation date
SIGMAROC PLC 0.46%	2026-01-21	5,155,455 ( 0.46% )	9 M $	2026-06-29

David Barrett active positions

Companies	Position	Start
SIGMAROC PLC	Founder	2004-08-11
Thames Recycling Ltd. Thames Recycling Ltd. TruckingTransportation Provides non-hazardous waste collection services	Director/Board Member	2013-09-30
SigmaFin Ltd. SigmaFin Ltd. Financial ConglomeratesFinance Functions as an investment holding company	Director/Board Member	2017-08-16
GDH (Holdings) Ltd. GDH (Holdings) Ltd. Financial ConglomeratesFinance Functions as an investment holding company	Director/Board Member	2019-04-17
Capital Concrete Ltd. Capital Concrete Ltd. Construction MaterialsNon-Energy Minerals Manufacturers concrete products	Director/Board Member	-
Thames Aggregates Ltd.	Director/Board Member	-

All active positions of David Barrett

Former positions of David Barrett

Companies	Position	End
London Concrete Ltd London Concrete Ltd Construction MaterialsNon-Energy Minerals Supplies construction and building materials	Founder	2014-12-31

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Experiences
Positions held

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Inactive

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Private companies

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Connections

1st degree connections

1st degree companies

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Female

Members of the board

Executives

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Linked companies

Private companies	7
Sigmaroc Plc Sigmaroc Plc Construction MaterialsNon-Energy Minerals Manufactures and supplies construction materials	Non-Energy Minerals
London Concrete Ltd London Concrete Ltd Construction MaterialsNon-Energy Minerals Supplies construction and building materials	Non-Energy Minerals
GDH (Holdings) Ltd. GDH (Holdings) Ltd. Financial ConglomeratesFinance Functions as an investment holding company	Finance
Thames Recycling Ltd. Thames Recycling Ltd. TruckingTransportation Provides non-hazardous waste collection services	Transportation
SigmaFin Ltd. SigmaFin Ltd. Financial ConglomeratesFinance Functions as an investment holding company	Finance
Capital Concrete Ltd. Capital Concrete Ltd. Construction MaterialsNon-Energy Minerals Manufacturers concrete products	Non-Energy Minerals
Thames Aggregates Ltd.