Immunodiagnostic Systems Holdings Limited
Registered name: IMMUNODIAGNOSTIC SYSTEMS HOLDINGS LIMITED
Part of Wellesley Bv groupImmunodiagnostic Systems Holdings Limited made £989k profit in the year to 29 Dec 2024 (revenue not disclosed).
Immunodiagnostic Systems Holdings Limited reported £989k profit in the year to 29 Dec 2024, up 316% on the year before; its revenue was not disclosed. It had 18 employees. The company is classified under “general medical practice activities” and is based in Boldon Colliery; we hold 3 years of its filed accounts.
- Status
- Active
- Location
- Boldon Colliery, North East
- Age
- 22 yrs · since 2004
- Type
- Private 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.
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. From the filing: “The immediate parent company is Revvity (UK) Holdings Limited.”
Key figures
This company published its profit but not its turnover, so revenue and margins are not disclosed. We never estimate them.
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 | 29 Dec 2024 |
|---|---|---|---|
| Disclosure | Profit only | Profit only | Profit only |
| Profit & loss | |||
| Revenue (turnover) | — | — | — |
| Profit before tax | £215k | £210k | £1m |
| Profit after tax | £215k | £237k | £989k |
| Profit (best available) | £215k | £237k | £989k |
| Staff costs | £1.8m | £2m | £1.5m |
| Employees (average) | 16 | 18 | 18 |
| Ratios | |||
| Profit margin | — | — | — |
| Profit per employee | £13.5k | £13.2k | £54.9k |
| Growth (year on year) | |||
| Profit growth | — | ▲10.2% | ▲316.5% |
| Headcount growth | — | ▲12.5% | 0% |
| Balance sheet — indirect signals, not revenue | |||
| Cash at bank | £1.4m | £1.7m | £3.5m |
| Net assets | £62m | £62.3m | £51m |
| Fixed assets | £35.3m | £35.3m | £35.3m |
| Current assets | £35.6m | £34.3m | £24.7m |
| Debtors | £34.2m | £32.5m | £21.2m |
| Deferred income | £373k | £915k | £397k |
| Source | FullAccounts · bulk data Sep 2024 | FullAccounts · bulk data Sep 2024 | FullAccounts · bulk data Nov 2025 |
How the business works
- Profit margin
- —
- Profit ÷ revenue.
- Gross margin
- —
- Gross profit ÷ revenue. High for software and services.
- Revenue per employee
- —
- Revenue ÷ average employees.
- Profit per employee
- £54.9k
- 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
- ▼18%
- Now £51m
- Cash at bank
- ▲103%
- Now £3.5m
- Headcount
- 0%
- Now 18
- Deferred income
- ▼57%
- Now £397k
- Fixed assets
- ▼0%
- Now £35.3m
Deferred income is reported together with accruals in this filing (“accruals and deferred income”), so it is an approximate signal only.
Group structure
Ownership chain
- Wellesley Bv (registered outside the UK register)ultimate parent75–100%
- Revvity (UK) Holdings Limited75–100%
- Immunodiagnostic Systems Holdings Limitedthis company
Bands show the share of ownership each company holds in the one below it.
Subsidiaries (1)
- Immunodiagnostic Systems LimitedRev. £31.6m · Profit −£18.7k
Sister companies (4)
- Horizon Discovery Group LimitedFigures not disclosed
- Oxford Immunotec Global LimitedRev. — · Profit −£62k
- Revvity (UK) LimitedFigures not disclosed
- Revvity LimitedFigures not disclosed
From the Persons with Significant Control register (corporate controllers only).
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Sources
Latest figures from FullAccounts for the year to 29 Dec 2024 (profit £989k), from the Companies House accounts bulk data published Nov 2025. Spotted an error? Request a correction.
Contains public sector information from Companies House licensed under the Open Government Licence v3.0. Data from Companies House, © Crown copyright. View the licence.