SERIMAX LIMITED
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Next accounts due
2027-09-30 (in 1y)
Last filed for 2025-12-31
Confirmation statement due
2026-10-27 (in 5mo)
Last made up 2025-10-13
Watchouts
Cash
£373
-90.7% vs 2024
Net assets
-£2M
+28.3% vs 2024
Employees
104
-5.5% vs 2024
Profit before tax
£924K
+937% vs 2024
Watchouts
Facts from the Companies House register and the latest accounts — not a rating
-
1 PSC ceased in last 24 months
Significant control changed hands — see the Ownership section.
Name history
Renamed 1 time since incorporation
- SERIMAX LIMITED 2007-01-09 → present
- UMAX LIMITED 1981-01-05 → 2007-01-09
Net assets
2-year trend · vs Industrials median
Accounts
2-year trend · latest reflected 2025-12-31
| Metric | Trend | 2024-12-31 | 2025-12-31 |
|---|---|---|---|
| Turnover | £20,679,157 | £18,978,923 | |
| Operating profit | £595,045 | £1,416,749 | |
| Profit before tax | £89,078 | £923,744 | |
| Net profit | -£34,224 | £907,850 | |
| Cash | £4,029 | £373 | |
| Total assets less current liabilities | -£3,103,705 | -£2,162,499 | |
| Net assets | -£3,202,834 | -£2,294,984 | |
| Equity | -£3,202,834 | -£2,294,984 | |
| Average employees | 110 | 104 | |
| Wages | £9,261,641 | £8,799,891 |
Values shown as filed in the company's annual accounts. — indicates the figure wasn't present under that line item in that period. About these numbers
Ratios
Computed from the line items above — sparklines read oldest → newest
| Ratio | Trend | 2024-12-31 | 2025-12-31 |
|---|---|---|---|
| Operating margin | 2.9% | 7.5% | |
| Net margin | -0.2% | 4.8% | |
| Return on capital employed | -19.2% | -65.5% | |
| Gearing (liabilities / total assets) | 149.8% | 138.0% | |
| Current ratio | 0.53x | 0.57x | |
| Interest cover | 1.18x | 2.87x |
Margins divide P&L lines by turnover. Gearing is liabilities over total assets. Current ratio is current assets over creditors falling due within one year. Interest cover is operating profit over absolute finance costs. Sector-distribution context coming next.
Audit & accounting basis
- Accounting basis
- FRS 101
- Reporting scope
- Standalone (parent only)
- Auditor
- A9 Accountancy Limited
- Audit opinion
- Unqualified (clean)
- Going concern
- Affirmed
“As discussed in note 1 to the financial statements, having assessed the financial position of the company and its future prospects, including the continuing availability of funding support from the Group (through a letter of support), the director considers the company has access to appropriate resources to allow it to continue in operational existence for at least 12 months from the date of signing the financial statements. Accordingly, the going concern basis continues to be adopted in the preparation of the financial statements.”
Group structure
- SERIMAX LIMITED · parent
- Serimax Angola Limited 100%
Significant events
- “The global Serimax Group was sold by Vallourec in July 2025, with Aldebaran Capital Partners becoming the majority shareholder.”
- “On 14th April 2025 Vallourec announced it had entered into exclusive negotiations with Aldebaran, a French investment company, for the sale of Serimax, Vallourec's subsidiary specializing in welding solutions. The sale was successfully concluded in July 2025 Aldebaran Capital purchased Serimax group from Vallourec and are the key shareholders.”
- “The Cyprus branch after a process of being deregistered, due to cessation of activities, was officially closed in February 2026.”
Auditor, going-concern and subsidiary information is drawn from the narrative of the latest annual accounts. About these numbers
People
2 active · 18 resigned
| Name | Role | Appointed | Born | Nationality |
|---|---|---|---|---|
| BURNESS PAULL LLP | Corporate Secretary | 2013-01-25 | — | — |
| GRAINDOR, Guillaume | Director | 2019-07-17 | Jul 1972 | French |
Show 18 resigned officers
| Name | Role | Appointed | Resigned |
|---|---|---|---|
| MILLS, James Ronald | Secretary | 2000-06-01 | 2002-01-07 |
| MILLS, James Ronald | Secretary | — | 1996-02-12 |
| THORN, Phillip Anthony | Secretary | 2002-01-07 | 2008-03-31 |
| IAIN SMITH AND COMPANY | Corporate Secretary | 1996-02-12 | 2000-06-01 |
| PAULL & WILLIAMSONS | Corporate Secretary | 2008-03-31 | 2009-04-06 |
| PAULL & WILLIAMSONS LLP | Corporate Secretary | 2009-04-06 | 2013-01-25 |
| CASTREC, Frederic | Director | 2011-10-31 | 2019-07-17 |
| DICKSON, Leslie John | Director | 2006-02-28 | 2007-06-13 |
| FRASER, James Milner | Director | 2002-08-01 | 2004-06-04 |
| MACKAY, James Innes | Director | 2006-02-28 | 2006-12-31 |
| MACKAY, James Innes | Director | 2005-10-24 | 2006-01-31 |
| MACLELLAN, Edmund Donald William | Director | 1993-09-07 | 2007-06-13 |
| MILLS, Ella | Director | 1997-06-02 | 2002-08-01 |
| MILLS, Ella | Director | — | 1995-04-05 |
| MILLS, Gerard James | Director | 1993-09-07 | 2002-08-01 |
| MILLS, James Ronald | Director | — | 2006-02-08 |
| THORN, Phillip Anthony | Director | 2002-01-07 | 2008-03-31 |
| WILLIAMS, David John | Director | 2007-06-13 | 2011-10-31 |
Ownership
Persons with significant control
| Name | Kind | Nature of control | Notified | Status |
|---|---|---|---|---|
| Aldebaran Capital Partners | Corporate entity | Shares 75–100%, Voting 50–75%, Appoints directors | 2025-07-24 | Active |
| Vallourec Sa | Corporate entity | Shares 75–100%, Voting 75–100%, Appoints directors | 2016-04-06 | Ceased 2025-07-24 |
Filing timeline
Last 20 of 172 total filings
Material constitutional events — rename, articles re-file, resolution
- 2020-12-17 RESOLUTIONS Resolution
| Date | Type | Category | Description | |
|---|---|---|---|---|
| 2026-05-05 | AA | accounts | Accounts with accounts type full | |
| 2026-01-20 | AAMD | accounts | Accounts amended with accounts type full | |
| 2025-12-11 | CH01 | officers | Change person director company with change date | |
| 2025-10-17 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2025-10-09 | PSC02 | persons-with-significant-control | Notification of a person with significant control | |
| 2025-10-09 | PSC07 | persons-with-significant-control | Cessation of a person with significant control | |
| 2025-08-13 | AA | accounts | Accounts with accounts type full | |
| 2024-10-14 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2024-10-03 | AA | accounts | Accounts with accounts type full | |
| 2023-10-31 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2023-10-25 | AA | accounts | Accounts with accounts type full | |
| 2023-10-03 | PSC05 | persons-with-significant-control | Change to a person with significant control | |
| 2023-02-02 | AA | accounts | Accounts with accounts type full | |
| 2022-10-19 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2021-12-20 | AA | accounts | Accounts with accounts type full | |
| 2021-11-08 | CS01 | confirmation-statement | Confirmation statement with updates | |
| 2021-06-03 | AA | accounts | Accounts with accounts type full | |
| 2020-12-17 | SH01 | capital | Capital allotment shares | |
| 2020-12-17 | RESOLUTIONS | resolution | Resolution | |
| 2020-10-14 | CS01 | confirmation-statement | Confirmation statement with no updates |
Public-record activity
Raw counts from Companies House — last 12–24 months
- Filings
- 7
- Capital events
- 0
- Officers appointed
- 0
- Officers resigned
- 0
last 12 months
last 24 months
last 12 months
last 12 months
Direct counts from the register. No score, no rating — see the Filing timeline for the underlying events.
Year-on-year
FY2024 → FY2025 · period ending 2025-12-31 vs 2024-12-31
-
Turnover
-8.2%
£20,679,157 £18,978,923
-
Cash
-90.7%
£4,029 £373
-
Net assets
+28.3%
-£3,202,834 -£2,294,984
-
Employees
-5.5%
110 104
-
Operating profit
+138.1%
£595,045 £1,416,749
-
Profit before tax
+937%
£89,078 £923,744
-
Wages
-5%
£9,261,641 £8,799,891
Each % is (latest − prior) ÷ |prior| for the line item as filed. The comparison is only shown when the latest and prior accounts cover broadly equal-length periods — short or long stubs (typical around incorporation or a year-end change) are suppressed rather than misrepresented. Lines a company doesn't report are omitted. About these numbers