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Company No. 00568879 · Incorporated 12 Jul 1956

Nasmyth Bulwell Limited

Registered name: NASMYTH BULWELL LIMITED

Part of Sigma Advanced Systems Ltd group

Nasmyth Bulwell Limited made £28.9m revenue and a £1m loss in the year to 30 Apr 2025.

Nasmyth Bulwell Limited’s revenue grew 35% to £28.9m in the year to 30 Apr 2025, with a loss of £1m and 203 employees. The company is classified under “manufacture of air and spacecraft and related machinery” and is based in Coventry; we hold 4 years of its filed accounts.

Full P&L filedSection C · ManufacturingSIC 30300Manufacture of air and spacecraft and related machinery
Status
Active
Location
Coventry, West Midlands
Age
70 yrs · since 1956
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 30 Apr 2025

Key figures

Capital-light
Revenue
£28.9m
Growth ▲34.6%
Profit
−£1m
Growth —
Profit margin
−3.6%
Gross 7.5%
Employees
203
Change ▲13.4%
Profit / employee
−£5.1k
Revenue/employee £142k
Profitable streak
0yrs
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 to30 Apr 202230 Apr 202330 Apr 202430 Apr 2025
DisclosureFull P&LFull P&LFull P&LFull P&L
Profit & loss
Revenue (turnover)£19.4m£16.5m£21.5m£28.9m
Cost of sales£21.2m£15.4m£19.5m£26.7m
Gross profit−£1.8m£1.1m£2m£2.2m
Operating profit−£4.5m−£408k£162k−£162k
Profit before tax−£4.6m−£825k−£589k−£1m
Profit after tax−£3.9m−£783k−£575k−£1m
Profit (best available)−£3.9m−£783k−£575k−£1m
Staff costs£8.5m£7m£7.7m£9.4m
Employees (average)169162179203
Ratios
Profit margin−20%−4.7%−2.7%−3.6%
Gross margin−9.3%6.7%9.3%7.5%
Revenue per employee£115k£102k£120k£142k
Profit per employee−£23k−£4.8k−£3.2k−£5.1k
Growth (year on year)
Revenue growth——▲29.8%▲34.6%
Headcount growth——▲10.5%▲13.4%
Balance sheet — indirect signals, not revenue
Cash at bank£113k£188k£9k£135k
Net assets−£52k−£835k−£1.4m−£2.4m
Fixed assets£3.1m£2.5m£2.5m£2.5m
Current assets£7m£10.3m£12.5m£16.4m
Debtors£4.2m£6.2m£7.1m£9.6m
Deferred income£834k£904k£1.3m£1.5m
Cash from operations£1.4m−£857k——
SourceFullAccounts · bulk data Apr 2024FullAccounts · bulk data Apr 2024FullAccounts · bulk data Apr 2025FullAccounts · bulk data Jan 2026
Derived from the latest filing

How the business works

Profit margin
−3.6%
Profit ÷ revenue.
Gross margin
7.5%
Gross profit ÷ revenue. High for software and services.
Revenue per employee
£142k
Revenue ÷ average employees.
Profit per employee
−£5.1k
Profit ÷ average employees.
Cash conversion
—
Cash generated from operations ÷ operating profit. Needs a cash-flow statement.
Fixed assets ÷ revenue
8.5%
Capital intensity. Low = capital-light, cheaper to start.
Deferred income ÷ revenue
5.3%
Customers paying upfront (subscriptions, deposits). Approximate when combined with accruals.
Debtors ÷ revenue
33.1%
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
—
Now −£2.4m
Cash at bank
▲1400%
Now £135k
Headcount
▲13%
Now 203
Deferred income
▲17%
Now £1.5m
Fixed assets
▼1%
Now £2.5m

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

  1. Sigma Advanced Systems Ltd (registered outside the UK register)ultimate parent75–100%
  2. Sigma Advanced Systems UK Ltd75–100%
  3. Nasmyth Group Limited75–100%
  4. Nasmyth Bulwell Limitedthis company

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

Sister companies (7)

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 30 Apr 2025 (profit −£1m), from the Companies House accounts bulk data published Jan 2026. Spotted an error? Request a correction.

Updated from Companies House on 11 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.