Diploma PLC
Registered name: DIPLOMA PLC
Diploma PLC made £1.5bn revenue and £186m profit in the year to 30 Sep 2025.
Diploma PLC’s revenue grew 12% to £1.5bn in the year to 30 Sep 2025, with £186m profit and 3,375 employees. The company is classified under “activities of head offices” and is based in London; we hold 3 years of its filed accounts.
- Status
- Active
- Location
- London, London
- Age
- 26 yrs · since 1999
- 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 Sep 2023 | 30 Sep 2024 | 30 Sep 2025 |
|---|---|---|---|
| Disclosure | Full P&L | Full P&L | Full P&L |
| Profit & loss | |||
| Revenue (turnover) | £1.2bn | £1.4bn | £1.5bn |
| Cost of sales | — | −£1.2bn | −£1.2bn |
| Operating profit | £183m | £207m | £284m |
| Profit before tax | £156m | £177m | £248m |
| Profit after tax | £118m | £130m | £186m |
| Profit (best available) | £118m | £130m | £186m |
| Employees (average) | 3,010 | 3,439 | 3,375 |
| Ratios | |||
| Profit margin | 9.9% | 9.5% | 12.2% |
| Revenue per employee | £399k | £396k | £452k |
| Profit per employee | £39.3k | £37.8k | £55k |
| Growth (year on year) | |||
| Revenue growth | — | ▲13.6% | ▲11.8% |
| Profit growth | — | ▲9.9% | ▲42.7% |
| Headcount growth | — | ▲14.2% | ▼1.9% |
| Balance sheet — indirect signals, not revenue | |||
| Net assets | — | — | — |
| Source | Accounts · bulk data Jan 2025 | Accounts · bulk data Jan 2025 | Accounts · bulk data Jan 2026 |
How the business works
- Profit margin
- 12.2%
- Profit ÷ revenue.
- Gross margin
- —
- Gross profit ÷ revenue. High for software and services.
- Revenue per employee
- £452k
- Revenue ÷ average employees.
- Profit per employee
- £55k
- 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
- ▼2%
- Now 3,375
- Deferred income
- —
- Now —
- Fixed assets
- —
- Now —
Group structure
Subsidiaries (2)
- Diploma Holdings PLCFigures not disclosed
- Diploma Overseas LimitedFigures not disclosed
From the Persons with Significant Control register (corporate controllers only).
Sources
Latest figures from accounts for the year to 30 Sep 2025 (profit £186m), from the Companies House accounts bulk data published Jan 2026. 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.