![David Barrett](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>)
David Barrett
Founder at
SIGMAROC PLC
Net worth: 9 M $ as of 31/05/2026
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% | 22/01/2026 | 5,155,455 ( 0.46% ) | 9 M $ | 31/05/2026 |
David Barrett active positions
| Companies | Position | Start |
|---|---|---|
| SIGMAROC PLC | Founder | 12/08/2004 |
Thames Recycling Ltd.
 Thames Recycling Ltd. TruckingTransportation Provides non-hazardous waste collection services | Director/Board Member | 01/10/2013 |
SigmaFin Ltd.
 SigmaFin Ltd. Financial ConglomeratesFinance Functions as an investment holding company | Director/Board Member | 17/08/2017 |
GDH (Holdings) Ltd.
 GDH (Holdings) Ltd. Financial ConglomeratesFinance Functions as an investment holding company | Director/Board Member | 18/04/2019 |
Capital Concrete Ltd.
 Capital Concrete Ltd. Construction MaterialsNon-Energy Minerals Manufacturers concrete products | Director/Board Member | - |
Thames Aggregates Ltd. | Director/Board Member | - |
Former positions of David Barrett
| Companies | Position | End |
|---|---|---|
London Concrete Ltd
 London Concrete Ltd Construction MaterialsNon-Energy Minerals Supplies construction and building materials | Founder | 01/01/2015 |
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
12
1st degree connections
7
1st degree companies
Male
Female
Members of the board
Executives
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. |
- Stock Market
- Insiders
- David Barrett
