Dia-Stron Limited
Registered name: DIA-STRON LIMITED
Part of Judges Scientific PLC groupDia-Stron Limited made £3.8m revenue and £854k profit in the year to 31 Dec 2025.
Dia-Stron Limited’s revenue grew 74% to £3.8m in the year to 31 Dec 2025, with £854k profit and 18 employees. The company is classified under “manufacture of electronic measuring, testing etc. equipment, not for industrial process control” and is based in London; we hold 3 years of its filed accounts.
- Status
- Active
- Location
- London, London
- Age
- 38 yrs · since 1987
- 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 2023 | 31 Dec 2024 | 31 Dec 2025 |
|---|---|---|---|
| Disclosure | Full P&L | Full P&L | Full P&L |
| Profit & loss | |||
| Revenue (turnover) | £2.5m | £2.2m | £3.8m |
| Cost of sales | — | −£1.5m | −£1.9m |
| Operating profit | £634k | £360k | £1.2m |
| Profit before tax | £608k | £324k | £1.1m |
| Profit after tax | £465k | £239k | £854k |
| Profit (best available) | £465k | £239k | £854k |
| Employees (average) | 19 | 16 | 18 |
| Ratios | |||
| Profit margin | 18.7% | 11.1% | 22.7% |
| Revenue per employee | £131k | £135k | £209k |
| Profit per employee | £24.5k | £14.9k | £47.4k |
| Growth (year on year) | |||
| Revenue growth | — | ▼13% | ▲74.4% |
| Profit growth | — | ▼48.6% | ▲257.5% |
| Headcount growth | — | ▼15.8% | ▲12.5% |
| Balance sheet — indirect signals, not revenue | |||
| Net assets | — | — | — |
| Source | Accounts · bulk data Oct 2025 | Accounts · bulk data Oct 2025 | Accounts · bulk data Sep 2026 |
How the business works
- Profit margin
- 22.7%
- Profit ÷ revenue.
- Gross margin
- —
- Gross profit ÷ revenue. High for software and services.
- Revenue per employee
- £209k
- Revenue ÷ average employees.
- Profit per employee
- £47.4k
- 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
- ▲13%
- Now 18
- Deferred income
- —
- Now —
- Fixed assets
- —
- Now —
Group structure
Ownership chain
- Judges Scientific PLCultimate parent75–100%
- Dia-Stron Limitedthis company
Bands show the share of ownership each company holds in the one below it.
Sister companies (20)
- Coolled LimitedRev. £12.3m · Profit £3.2m
- Oxford Cryosystems LimitedRev. £8.9m · Profit £1.3m
- Scientifica LtdRev. £7.3m · Profit −£173k
- Fire Testing Technology LimitedRev. £5.1m · Profit −£216k
- Deben UK LimitedRev. £4m · Profit £94k
- Geotek Coring LimitedRev. £3.5m · Profit £1.7m
- Henniker Scientific LimitedRev. £2.4m · Profit £457k
- Ewb Solutions Ltd.Rev. £2.3m · Profit £175k
- Armfield LimitedFigures not disclosed
- Bordeaux Acquisition LimitedFigures not disclosed
- Geotek Holding LimitedFigures not disclosed
- Global Digital Systems LimitedFigures not disclosed
- Judges Capital LimitedFigures not disclosed
- Korvus Technology LtdFigures not disclosed
- Magsputter LimitedRev. — · Profit £240k
- Pe. Fiberoptics LimitedFigures not disclosed
- Polaron Instruments LimitedFigures not disclosed
- Quorum Technologies LimitedFigures not disclosed
- Thermal Hazard Technology LimitedFigures not disclosed
- Uhv Design 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 £854k), from the Companies House accounts bulk data published Sep 2026. Spotted an error? Request a correction.
Updated from Companies House on 12 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.