How much does Sem Limited make?

Sem Limited reported revenue of £20.1m and £897k profit in the year to 31 Dec 2025, according to its accounts filed at Companies House.

How many employees does Sem Limited have?

Sem Limited reported an average of 132 employees in the year to 31 Dec 2025.

Is Sem Limited profitable?

Yes — Sem Limited reported a profit of £897k in the year to 31 Dec 2025.

Company No. 00138006 · Incorporated 17 Oct 1914

Sem Limited

Registered name: SEM LIMITED

Part of Dr Johannes Heidenhain Gmbh group

Sem Limited made £20.1m revenue and £897k profit in the year to 31 Dec 2025.

Sem Limited’s revenue grew 13% to £20.1m in the year to 31 Dec 2025, with £897k profit and 132 employees. The company is classified under “manufacture of electric motors, generators and transformers” and is based in Dartford; we hold 4 years of its filed accounts.

Full P&L filedSection C · ManufacturingSIC 27110Manufacture of electric motors, generators and transformers

Status: Active
Location: Dartford, South East
Age: 111 yrs · since 1914
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. From the filing: “The immediate parent company is Westec Holding Company Limited, a company registered in England and Wales, which”

Latest accounts · year to 31 Dec 2025

Key figures

Doing more with lessCash flow filed

Revenue

£20.1m

Growth ▲13.1%

Profit

£897k

Growth ▼19.6%

Profit margin

4.5%

Gross 20.6%

Employees

132

Change ▼0.8%

Profit / employee

£6.8k

Revenue/employee £153k

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 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)	£20.8m	£19.5m	£17.8m	£20.1m
Cost of sales	£17.6m	£16m	£14.2m	£16m
Gross profit	£3.2m	£3.5m	£3.6m	£4.1m
Operating profit	£556k	£716k	£1.1m	£1.2m
Profit before tax	£591k	£899k	£1.4m	£1.2m
Profit after tax	£591k	£251k	£1.1m	£897k
Profit (best available)	£591k	£251k	£1.1m	£897k
Staff costs	£5.6m	£5.6m	£5.7m	£5.9m
Employees (average)	137	131	133	132
Ratios
Profit margin	2.9%	1.3%	6.3%	4.5%
Gross margin	15.2%	18%	20.4%	20.6%
Revenue per employee	£152k	£149k	£134k	£153k
Profit per employee	£4.3k	£1.9k	£8.4k	£6.8k
Cash conversion	1006%	225.9%	−870.9%	−343.1%
Growth (year on year)
Revenue growth	—	▼6%	▼8.8%	▲13.1%
Profit growth	—	▼57.6%	▲344.2%	▼19.6%
Headcount growth	—	▼4.4%	▲1.5%	▼0.8%
Balance sheet — indirect signals, not revenue
Cash at bank	£4.8m	£2m	£4.7m	£7.3m
Net assets	£34m	£34.3m	£30.4m	£31.3m
Fixed assets	£18m	£17.6m	£17.1m	£16.8m
Current assets	£18m	£19.4m	£15m	£16.7m
Debtors	£8.8m	£11.1m	£3.7m	£3.9m
Deferred income	£414k	£415k	£304k	£299k
Cash from operations	£5.6m	£1.6m	−£9.5m	−£4.1m
Source	FullAccounts · bulk data Sep 2024	FullAccounts · bulk data Sep 2024	FullAccounts · bulk data Sep 2025	FullAccounts · bulk data Sep 2026

Derived from the latest filing

How the business works

Profit margin: 4.5%; Profit ÷ revenue.
Gross margin: 20.6%; Gross profit ÷ revenue. High for software and services.
Revenue per employee: £153k; Revenue ÷ average employees.
Profit per employee: £6.8k; Profit ÷ average employees.
Cash conversion: −343.1%; Cash generated from operations ÷ operating profit. Needs a cash-flow statement.
Fixed assets ÷ revenue: 83.2%; Capital intensity. Low = capital-light, cheaper to start.
Deferred income ÷ revenue: 1.5%; 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: ▲3%; Now £31.3m
Cash at bank: ▲55%; Now £7.3m
Headcount: ▼1%; Now 132
Deferred income: ▼2%; Now £299k
Fixed assets: ▼2%; Now £16.8m

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

Dr Johannes Heidenhain Gmbh (registered outside the UK register)ultimate parent75–100%
Westec Holding Company Limited75–100%
Sem Limitedthis company

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

Sister companies (2)

Heidenhain GB LimitedRev. — · Profit £794k
Machineworks LimitedFigures not disclosed

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

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Sources

Companies House profile Filing history & original accounts

Latest figures from FullAccounts for the year to 31 Dec 2025 (profit £897k), from the Companies House accounts bulk data published Sep 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.