Spark Therapeutics UK Ltd
Registered name: SPARK THERAPEUTICS UK LTD
Part of Spark Therapeutics International Holdings, Inc groupSpark Therapeutics UK Ltd made £2.1m revenue and a £36.3k loss in the year to 31 Dec 2025.
Spark Therapeutics UK Ltd’s revenue fell 4% to £2.1m in the year to 31 Dec 2025, with a loss of £36.3k and 2 employees. The company is classified under “other human health activities” and is based in Welwyn Garden City; we hold 4 years of its filed accounts.
- Status
- Active
- Location
- Welwyn Garden City, East of England
- Age
- 10 yrs · since 2016
- 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&L | Full P&L | Full P&L | Full P&L |
| Profit & loss | ||||
| Revenue (turnover) | £803k | £1.4m | £2.2m | £2.1m |
| Operating profit | £62.9k | £132k | £147k | −£11.6k |
| Profit before tax | £522k | −£86.5k | £112k | −£1.5k |
| Profit after tax | £409k | −£64.9k | −£61.3k | −£36.3k |
| Profit (best available) | £409k | −£64.9k | −£61.3k | −£36.3k |
| Employees (average) | 3 | 3 | 3 | 2 |
| Ratios | ||||
| Profit margin | 50.9% | −4.5% | −2.8% | −1.7% |
| Revenue per employee | £268k | £476k | £721k | £1m |
| Profit per employee | £136k | −£21.6k | −£20.4k | −£18.1k |
| Growth (year on year) | ||||
| Revenue growth | — | ▲77.6% | ▲51.7% | ▼3.5% |
| Profit growth | — | ▼115.9% | — | — |
| Headcount growth | — | 0% | 0% | ▼33.3% |
| Balance sheet — indirect signals, not revenue | ||||
| Cash at bank | £373k | £90.7k | — | — |
| Net assets | £4.5m | £4.5m | — | — |
| Current assets | £4.7m | £4.5m | — | — |
| Debtors | £2.9k | £0 | — | — |
| Source | FullAccounts · bulk data Oct 2024 | FullAccounts · bulk data Oct 2024 | Accounts · bulk data Oct 2026 | Accounts · bulk data Oct 2026 |
How the business works
- Profit margin
- −1.7%
- Profit ÷ revenue.
- Gross margin
- —
- Gross profit ÷ revenue. High for software and services.
- Revenue per employee
- £1m
- Revenue ÷ average employees.
- Profit per employee
- −£18.1k
- 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
- ▼33%
- Now 2
- Deferred income
- —
- Now —
- Fixed assets
- —
- Now —
Group structure
Ownership chain
- Spark Therapeutics International Holdings, Inc (registered outside the UK register)ultimate parent75–100%
- Spark Therapeutics UK Ltdthis company
Bands show the share of ownership each company holds in the one below it.
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 −£36.3k), from the Companies House accounts bulk data published Oct 2026. Spotted an error? Request a correction.
Updated from Companies House on 17 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.