How much does Diomed Developments Limited make?

Diomed Developments Limited reported revenue of £21.2m and £2.8m profit in the year to 31 May 2025, according to its accounts filed at Companies House.

How many employees does Diomed Developments Limited have?

Diomed Developments Limited reported an average of 6 employees in the year to 31 May 2025.

Is Diomed Developments Limited profitable?

Yes — Diomed Developments Limited reported a profit of £2.8m in the year to 31 May 2025.

Company No. 00745839 · Incorporated 2 Jan 1963

Diomed Developments Limited

Registered name: DIOMED DEVELOPMENTS LIMITED

Part of Diomed Group Holdings Limited group

Diomed Developments Limited made £21.2m revenue and £2.8m profit in the year to 31 May 2025.

Diomed Developments Limited’s revenue grew 6% to £21.2m in the year to 31 May 2025, with £2.8m profit and 6 employees. The company is classified under “manufacture of basic pharmaceutical products” and is based in Loughton; we hold 4 years of its filed accounts.

Full P&L filedSection C · ManufacturingSIC 21100Manufacture of basic pharmaceutical products

Status: Active
Location: Loughton, London
Age: 63 yrs · since 1963
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.

Latest accounts · year to 31 May 2025

Key figures

Small teamCapital-lightOperating leverage

Revenue

£21.2m

Growth ▲5.7%

Profit

£2.8m

Growth ▲171.7%

Profit margin

13.3%

Gross 47.4%

Employees

Change 0%

Profit / employee

£470k

Revenue/employee £3.5m

Profitable streak

4yrs

Consecutive profitable years in our data

Badges are automated estimates derived from the filed figures — not statements of fact about the company.

4 filed years

Financial history

Multi-year financials, oldest to newest
Year to	31 May 2022	31 May 2023	31 May 2024	31 May 2025
Disclosure	Profit only	Profit only	Full P&L	Full P&L
Profit & loss
Revenue (turnover)	—	—	£20.1m	£21.2m
Cost of sales	—	—	£11.7m	£11.2m
Gross profit	—	—	£8.3m	£10m
Operating profit	—	—	£715k	£2.1m
Profit before tax	—	—	£1m	£2.8m
Profit after tax	£1.5m	£612k	£1m	£2.8m
Profit (best available)	£1.5m	£612k	£1m	£2.8m
Staff costs	—	—	£530k	£593k
Employees (average)	7	6	6	6
Ratios
Profit margin	—	—	5.2%	13.3%
Gross margin	—	—	41.4%	47.4%
Revenue per employee	—	—	£3.3m	£3.5m
Profit per employee	£215k	£102k	£173k	£470k
Growth (year on year)
Revenue growth	—	—	—	▲5.7%
Profit growth	—	▼59.4%	▲69.4%	▲171.7%
Headcount growth	—	▼14.3%	0%	0%
Balance sheet — indirect signals, not revenue
Cash at bank	£26.1m	£16.5m	£15.2m	£16.2m
Net assets	£24.1m	£24.8m	£25.8m	£15.7m
Fixed assets	£625k	£625k	£625k	£290k
Current assets	£40.3m	£31.6m	£33.3m	£24.9m
Debtors	£5.9m	£4m	£4m	£4.2m
Deferred income	£163k	£424k	£295k	£1.5m
Source	Accounts · bulk data Feb 2024	Accounts · bulk data Feb 2024	FullAccounts · bulk data Feb 2025	FullAccounts · bulk data Feb 2026

Derived from the latest filing

How the business works

Profit margin: 13.3%; Profit ÷ revenue.
Gross margin: 47.4%; Gross profit ÷ revenue. High for software and services.
Revenue per employee: £3.5m; Revenue ÷ average employees.
Profit per employee: £470k; Profit ÷ average employees.
Cash conversion: —; Cash generated from operations ÷ operating profit. Needs a cash-flow statement.
Fixed assets ÷ revenue: 1.4%; Capital intensity. Low = capital-light, cheaper to start.
Deferred income ÷ revenue: 7.3%; Customers paying upfront (subscriptions, deposits). Approximate when combined with accruals.
Debtors ÷ revenue: 19.6%; Money owed by customers. Low = customers pay quickly.

Indirect — not revenue

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: ▼39%; Now £15.7m
Cash at bank: ▲6%; Now £16.2m
Headcount: 0%; Now 6
Deferred income: ▲425%; Now £1.5m
Fixed assets: ▼54%; Now £290k

Deferred income is reported together with accruals in this filing (“accruals and deferred income”), so it is an approximate signal only.

Corporate ownership

Group structure

Ownership chain

Diomed Group Holdings Limitedultimate parent75–100%
Diomed Developments Limitedthis company

Bands show the share of ownership each company holds in the one below it.

Subsidiaries (5)

Dermal Laboratories LimitedRev. £45.7m · Profit £2.4m
Aeropak (Chemical Products) LimitedRev. £16.5m · Profit £518k
Brome and Schimmer LimitedRev. — · Profit −£3.8k
Diomed Direct LimitedRev. — · Profit −£30
Diomed Pharmaceuticals LimitedFigures not disclosed

From the Persons with Significant Control register (corporate controllers only).

Same industry, similar size

Similar profitable businesses

Industry benchmarks →

Sources

Companies House profile Filing history & original accounts

Latest figures from FullAccounts for the year to 31 May 2025 (profit £2.8m), from the Companies House accounts bulk data published Feb 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.