SONARDYNE HOLDINGS LIMITED
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Next accounts due
2026-09-30 (in 4mo)
Last filed for 2024-12-31
Confirmation statement due
2027-01-17 (in 8mo)
Last made up 2026-01-03
Watchouts
None on the register
Cash
£38M
+44.6% highest in 3 filed years
Net assets
£116M
+12.3% highest in 3 filed years
Employees
619
+11.7% highest in 3 filed years
Profit before tax
£20M
+127.1% vs 2023
Net assets
3-year trend · vs Technology median
Accounts
3-year trend · latest reflected 2024-12-31
| Metric | Trend | 2022-12-31 | 2023-12-31 | 2024-12-31 |
|---|---|---|---|---|
| Turnover | — | £101,013,556 | £122,278,639 | |
| Operating profit | — | £7,889,516 | £18,608,060 | |
| Profit before tax | — | £8,586,196 | £19,503,422 | |
| Net profit | £448,276 | £7,181,292 | £14,125,115 | |
| Cash | £13,771,694 | £26,122,517 | £37,767,849 | |
| Total assets less current liabilities | £43,170,109 | £105,798,026 | £118,738,177 | |
| Net assets | — | £103,188,103 | £115,891,627 | |
| Equity | — | £103,188,103 | £115,891,627 | |
| Average employees | 4 | 554 | 619 | |
| Wages | — | £35,310,350 | £42,235,970 | |
| Directors' remuneration | — | £387,703 | £492,350 |
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
Year-on-year
FY2023 → FY2024 · period ending 2024-12-31 vs 2023-12-31
-
Turnover
+21.1%
£101,013,556 £122,278,639
-
Cash
+44.6%
£26,122,517 £37,767,849
highest in 3 filed years
-
Net assets
+12.3%
£103,188,103 £115,891,627
-
Employees
+11.7%
554 619
highest in 3 filed years
-
Operating profit
+135.9%
£7,889,516 £18,608,060
-
Profit before tax
+127.1%
£8,586,196 £19,503,422
-
Wages
+19.6%
£35,310,350 £42,235,970
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
Ratios
Computed from the line items above — sparklines read oldest → newest
| Ratio | Trend | 2022-12-31 | 2023-12-31 | 2024-12-31 |
|---|---|---|---|---|
| Operating margin | — | 7.8% | 15.2% | |
| Net margin | — | 7.1% | 11.6% | |
| Return on capital employed | — | 7.5% | 15.7% | |
| Gearing (liabilities / total assets) | — | 20.8% | 26.5% | |
| Current ratio | — | 3.05x | 2.51x | |
| Interest cover | — | 149.85x | 498.01x |
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.
Name history
Renamed 2 times since incorporation
- SONARDYNE HOLDINGS LIMITED 2020-03-02 → present
- SONARDYNE GROUP LIMITED 1986-01-01 → 2020-03-02
- ALTONQUART LIMITED 1985-12-04 → 1986-01-01
Audit & accounting basis
- Accounting basis
- FRS 102
- Reporting scope
- Consolidated group
- Auditor
- Azets Audit Services
- Audit opinion
- Unqualified (clean)
- Going concern
- Affirmed
“In auditing the financial statements, we have concluded that the directors' use of the going concern basis of accounting in the preparation of the financial statements is appropriate. Based on the work we have performed, we have not identified any material uncertainties relating to events or conditions that, individually or collectively, may cast significant doubt on the group's and parent company's ability to continue as a going concern for a period of at least twelve months from when the financial statements are authorised for issue.”
Group structure
- SONARDYNE HOLDINGS LIMITED · parent
- Sonardyne International Limited 100%
- Sonardyne Limited 100%
- Covelya Group Limited 100%
- Sonardyne Overseas Holdings Limited 100%
- Sonardyne Brazil Limited 100%
- Wavefront Systems Limited 100%
- Sonardyne Inc 100%
- Sonardyne Asia Pte Limited 100%
- Sonardyne Brasil Limitada 100%
- Chelsea Technologies Limited 100%
- PropCov Limited 100%
- EIVA Robotics UK Limited 100%
- EIVA A/S 100%
- Voyis Imaging Inc 100%
- Covelya Limited 100%
- Sonardyne Group Limited 100%
- Forcys Limited 100%
- Forcys Australia Pty Limited 100%
- SensorSurvey A/S 100%
- Acousonix Limited 100%
- Forcys Inc 100%
- EIVA SGP Pte Limited 100%
Significant events
- “Order intake of £149.5m (2023: £111.3m) was also significantly improved (up by 34%), buoyed by a large multi-year order in Brazil for our Sonardyne business and the Group enters 2025 with strong order book coverage of over 50% for the year.”
- “The Group's largest Operating Company has fully assessed its Scope 1, 2 and 3 emissions, and has offset all those applicable from its UK operations for 2024. At the UK headquarters, all gas-burning appliances have been removed in favour of renewable electric alternatives, and voltage optimisation equipment has been installed across several buildings. Targeted utilisation of high-quality verified carbon offsetting schemes has enabled this entity to become verified as carbon neutral in 2024.”
- “Demand in our core Offshore Oil & Gas markets has remained robust, whilst our strategic focus on the Offshore Renewable Energy and Defence sectors has resulted in significant growth in those markets. Elsewhere, we have seen a softening in the Ocean Science sector, a position which will be further challenged in 2025 as a result of reduced US government expenditure in this area.”
Auditor, going-concern and subsidiary information is drawn from the narrative of the latest annual accounts. About these numbers
People
4 active · 3 resigned
| Name | Role | Appointed | Born | Nationality |
|---|---|---|---|---|
| PARTRIDGE, Charles John | Secretary | — | — | British |
| EVANS, Nicola Jane | Director | 2021-03-02 | Apr 1967 | British |
| PARTRIDGE, Charles John | Director | — | Sep 1939 | British |
| PARTRIDGE, Simon Charles | Director | 2021-11-15 | Nov 1970 | British |
Show 3 resigned officers
| Name | Role | Appointed | Resigned |
|---|---|---|---|
| CLUTTON, Roger Barry | Director | 2008-03-20 | 2014-05-04 |
| PARTRIDGE, Betsan Felicity | Director | — | 2022-12-31 |
| PARTRIDGE, Simon Charles | Director | 2009-12-17 | 2014-03-31 |
Ownership
Persons with significant control
| Name | Kind | Nature of control | Notified | Status |
|---|---|---|---|---|
| Mrs Nicola Jane Evans | Individual | Shares 25–50%, Voting 75–100% | 2024-11-13 | Active |
| Mr Simon Charles Partridge | Individual | Shares 25–50%, Voting 50–75% | 2024-11-13 | Active |
| Mr Charles John Partridge | Individual | Voting 50–75% | 2016-04-06 | Active |
| Mrs Betsan Felicity Partridge | Individual | Shares 25–50% | 2016-04-06 | Active |
Filing timeline
Last 20 of 114 total filings
| Date | Type | Category | Description | |
|---|---|---|---|---|
| 2026-01-05 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2025-10-24 | PSC04 | persons-with-significant-control | Change to a person with significant control | |
| 2025-10-24 | CH01 | officers | Change person director company with change date | |
| 2025-09-24 | AA | accounts | Accounts with accounts type group | |
| 2025-01-13 | CS01 | confirmation-statement | Confirmation statement with updates | |
| 2024-12-02 | PSC04 | persons-with-significant-control | Change to a person with significant control | |
| 2024-11-20 | PSC01 | persons-with-significant-control | Notification of a person with significant control | |
| 2024-11-20 | PSC04 | persons-with-significant-control | Change to a person with significant control | |
| 2024-11-20 | PSC01 | persons-with-significant-control | Notification of a person with significant control | |
| 2024-09-27 | AA | accounts | Accounts with accounts type group | |
| 2024-01-03 | CS01 | confirmation-statement | Confirmation statement with updates | |
| 2023-11-16 | CS01 | confirmation-statement | Confirmation statement with updates | |
| 2023-10-10 | AA | accounts | Accounts with accounts type group | |
| 2023-02-07 | CS01 | confirmation-statement | Confirmation statement with updates | |
| 2023-01-06 | TM01 | officers | Termination director company with name termination date | |
| 2022-11-09 | CH01 | officers | Change person director company with change date | |
| 2022-10-06 | AA | accounts | Accounts with accounts type group | |
| 2022-02-11 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2021-12-30 | AA | accounts | Accounts with accounts type group | |
| 2021-12-14 | AA01 | accounts | Change account reference date company current shortened |
Public-record activity
Raw counts from Companies House — last 12–24 months
- Filings
- 4
- 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.