Updated 25 October 2026 · from filed accounts
The 10 biggest companies in Wales
Iceland is the biggest company registered in Wales by turnover, with £4.2bn in its latest filed accounts. Redrow and MONY Group follow. Together the 10 companies below turned over £8.28bn in their latest filed years.
- 1
IcelandDeeside · Grocery & retail · FY to Mar 2025
£4.2bn
+0.3% on the year before
- 2
RedrowFlintshire · Building & construction · FY to Jul 2023
£2.13bn
-0.6% on the year before
- 3
MONY GroupEwloe · Other · FY to Dec 2025
£446m
+1.6% on the year before
- 4Sinclair Garages (Swansea)
Bridgend · Other · FY to Dec 2025
£277m
+16% on the year before
- 5Advance Contracting Solutions
Ewloe · Other · FY to Mar 2025
£253m
+0.5% on the year before
- 6Sinclair Garages
Bridgend · Other · FY to Dec 2025
£248m
+4.0% on the year before
- 7Jones Bros. Ruthin (Civil Engineering) Co
Ruthin · Building & construction · FY to Mar 2026
£233m
+55% on the year before
- 8
RalawiseDeeside · Grocery & retail · FY to Dec 2025
£171m
+1.8% on the year before
- 9Boots Hearingcare
Llandudno · Health & pharma · FY to Mar 2026
£170m
+9.1% on the year before
- 10JTG Holdings
Kidwelly · Other · FY to Dec 2025
£154m
+4.3% on the year before
How this list is made
From each company's latest accounts filed at Companies House, or its annual report for listed groups: the figures as filed, nothing estimated. Changes compare the two latest filed years. Only companies that report in pounds are ranked; groups that report in dollars or euros aren't converted. Subsidiaries whose figures are part of a listed group's are counted once, in the group. Updated daily as new accounts are filed.