Sdi Group PLC
Registered name: SDI GROUP PLC
Sdi Group PLC made £66.2m revenue and £4m profit in the year to 30 Apr 2025.
Sdi Group PLC’s revenue grew 1% to £66.2m in the year to 30 Apr 2025, with £4m profit and 504 employees. The company is classified under “activities of head offices” and is based in Cambridge; we hold 3 years of its filed accounts.
- Status
- Active
- Location
- Cambridge, East of England
- Age
- 19 yrs · since 2007
- Type
- Public Limited Company
Pass-through vehicle. This looks like a holding, staffing or umbrella company. Its revenue and profit may largely pass through to or from other entities, so the figures may not reflect a standalone operating business. It is excluded from our opportunity lists.
Key figures
Badges are automated estimates derived from the filed figures — not statements of fact about the company.
Financial history
| Year to | 30 Apr 2023 | 30 Apr 2024 | 30 Apr 2025 |
|---|---|---|---|
| Disclosure | Full P&L | Full P&L | Full P&L |
| Profit & loss | |||
| Revenue (turnover) | £67.6m | £65.8m | £66.2m |
| Operating profit | £6.8m | £7.3m | £6.9m |
| Profit before tax | £5.8m | £5.7m | £5.5m |
| Profit after tax | £3.9m | £4.3m | £4m |
| Profit (best available) | £3.9m | £4.3m | £4m |
| Employees (average) | 489 | 503 | 504 |
| Ratios | |||
| Profit margin | 5.8% | 6.5% | 6.1% |
| Revenue per employee | £138k | £131k | £131k |
| Profit per employee | £8k | £8.5k | £8k |
| Growth (year on year) | |||
| Revenue growth | — | ▼2.6% | ▲0.5% |
| Profit growth | — | ▲9% | ▼5.1% |
| Headcount growth | — | ▲2.9% | ▲0.2% |
| Balance sheet — indirect signals, not revenue | |||
| Net assets | — | — | — |
| Source | Accounts · bulk data Oct 2024 | Accounts · bulk data Oct 2024 | Accounts · bulk data Sep 2025 |
How the business works
- Profit margin
- 6.1%
- Profit ÷ revenue.
- Gross margin
- —
- Gross profit ÷ revenue. High for software and services.
- Revenue per employee
- £131k
- Revenue ÷ average employees.
- Profit per employee
- £8k
- 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
- ▲0%
- Now 504
- Deferred income
- —
- Now —
- Fixed assets
- —
- Now —
Group structure
Subsidiaries (23)
- Applied Thermal Control LimitedFigures not disclosed
- Astles Control Systems LimitedFigures not disclosed
- Atik Cameras LimitedFigures not disclosed
- Chell Instruments LimitedFigures not disclosed
- Collins Walker LimitedFigures not disclosed
- Ducthub LimitedFigures not disclosed
- Fistreem International LimitedFigures not disclosed
- Fraser Anti-Static Techniques LimitedFigures not disclosed
- Graticules Optics LimitedFigures not disclosed
- Hillmead Technology LimitedFigures not disclosed
- Inspecvision LimitedFigures not disclosed
- Labhub LimitedFigures not disclosed
- Lte Scientific LimitedFigures not disclosed
- Monmouth Scientific LimitedFigures not disclosed
- MPB Industries LimitedFigures not disclosed
- Opus Instruments LtdFigures not disclosed
- Peak Sensors (Holding) LimitedFigures not disclosed
- Safelab Systems LimitedFigures not disclosed
- Scientific Vacuum Systems LtdFigures not disclosed
- Sentek LimitedFigures not disclosed
- Severn Thermal Solutions LimitedFigures not disclosed
- Synoptics LimitedFigures not disclosed
- Thermal Exchange LimitedFigures not disclosed
From the Persons with Significant Control register (corporate controllers only).
Sources
Latest figures from accounts for the year to 30 Apr 2025 (profit £4m), from the Companies House accounts bulk data published Sep 2025. Spotted an error? Request a correction.
Updated from Companies House on 15 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.