Sonardyne International Limited
Registered name: SONARDYNE INTERNATIONAL LIMITED
Part of Covelya Group Limited groupSonardyne International Limited made £89.8m revenue and £20.5m profit in the year to 31 Dec 2025.
Sonardyne International Limited’s revenue grew 14% to £89.8m in the year to 31 Dec 2025, with £20.5m profit. The company is classified under “manufacture of electronic measuring, testing etc. equipment, not for industrial process control” and is based in Yateley; we hold 4 years of its filed accounts.
- Status
- Active
- Location
- Yateley, South East
- Age
- 49 yrs · since 1977
- Type
- Private Limited Company
Part of a group. The filing indicates this company sits within a group structure, so its results may depend on intra-group trading and it may be hard to replicate independently.
Key figures
Badges are automated estimates derived from the filed figures — not statements of fact about the company.
Financial history
| Year to | 31 Dec 2022 | 31 Dec 2023 | 31 Dec 2024 | 31 Dec 2025 |
|---|---|---|---|---|
| Disclosure | Full P&Lread from filing text | Full P&L | Full P&L | Full P&L |
| Profit & loss | ||||
| Revenue (turnover) | £48.9m | £67.9m | £78.7m | £89.8m |
| Cost of sales | £22.2m | £26.9m | −£27.3m | −£32.5m |
| Gross profit | £26.7m | £41m | £51.4m | £57.4m |
| Operating profit | £5.9m | £14.7m | £22.3m | £23.2m |
| Profit before tax | £7m | £15.5m | £22.9m | £25.6m |
| Profit after tax | £6.4m | £13.3m | £18.1m | £20.5m |
| Profit (best available) | £6.4m | £13.3m | £18.1m | £20.5m |
| Staff costs | £17.4m | £20.5m | — | — |
| Employees (average) | 266 | 309 | — | — |
| Ratios | ||||
| Profit margin | 13.1% | 19.6% | 22.9% | 22.9% |
| Gross margin | 54.6% | 60.4% | 65.3% | 63.8% |
| Revenue per employee | £184k | £220k | — | — |
| Profit per employee | £24k | £43.1k | — | — |
| Growth (year on year) | ||||
| Revenue growth | — | ▲38.9% | ▲15.9% | ▲14.1% |
| Profit growth | — | ▲108.9% | ▲35.4% | ▲13.8% |
| Headcount growth | — | ▲16.2% | — | — |
| Balance sheet — indirect signals, not revenue | ||||
| Cash at bank | £3.1m | £8.3m | — | — |
| Net assets | £32.3m | £41.6m | — | — |
| Fixed assets | £8.3m | £9.2m | — | — |
| Current assets | £36.1m | £47.7m | — | — |
| Debtors | £6.1m | £8.8m | — | — |
| Deferred income | £6m | £7.2m | — | — |
| Source | FullAccounts · bulk data Sep 2024 | FullAccounts · bulk data Sep 2024 | Accounts · bulk data Sep 2025 | Accounts · bulk data Apr 2026 |
How the business works
- Profit margin
- 22.9%
- Profit ÷ revenue.
- Gross margin
- 63.8%
- Gross profit ÷ revenue. High for software and services.
- Revenue per employee
- —
- Revenue ÷ average employees.
- Profit per employee
- —
- Profit ÷ average employees.
- Cash conversion
- —
- Cash generated from operations ÷ operating profit. Needs a cash-flow statement.
- Fixed assets ÷ revenue
- —
- Capital intensity. Low = capital-light, cheaper to start.
- Deferred income ÷ revenue
- —
- Customers paying upfront (subscriptions, deposits). Approximate when combined with accruals.
- Debtors ÷ revenue
- —
- Money owed by customers. Low = customers pay quickly.
Balance-sheet signals
Year-on-year changes in filed balance-sheet items. They can hint at momentum (or investment) but are not revenue or profit and must not be read as such.
- Net assets
- —
- Now —
- Cash at bank
- —
- Now —
- Headcount
- —
- Now —
- Deferred income
- —
- Now —
- Fixed assets
- —
- Now —
Group structure
Ownership chain
- Covelya Group Limitedultimate parent75–100%
- Sonardyne International Limitedthis company
Bands show the share of ownership each company holds in the one below it.
Subsidiaries (1)
- Sonardyne Overseas Holdings LimitedFigures not disclosed
Sister companies (6)
- Chelsea Technologies LtdFigures not disclosed
- Covelya LimitedFigures not disclosed
- Forcys LimitedFigures not disclosed
- Propcov LimitedFigures not disclosed
- Sonardyne Group LimitedFigures not disclosed
- Wavefront Systems LimitedFigures not disclosed
From the Persons with Significant Control register (corporate controllers only).
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Sources
Latest figures from accounts for the year to 31 Dec 2025 (profit £20.5m), from the Companies House accounts bulk data published Apr 2026. Spotted an error? Request a correction.
Updated from Companies House on 13 Oct 2026
Contains public sector information from Companies House licensed under the Open Government Licence v3.0. Data from Companies House, © Crown copyright. View the licence.