How much does Surge Protection Devices Limited make?

Surge Protection Devices Limited reported revenue of £3.7m and £1.7m profit in the year to 31 Dec 2025, according to its accounts filed at Companies House.

How many employees does Surge Protection Devices Limited have?

Surge Protection Devices Limited reported an average of 10 employees in the year to 31 Dec 2025.

Is Surge Protection Devices Limited profitable?

Yes — Surge Protection Devices Limited reported a profit of £1.7m in the year to 31 Dec 2025.

Company No. 05920962 · Incorporated 31 Aug 2006

Surge Protection Devices Limited

Registered name: SURGE PROTECTION DEVICES LIMITED

Part of Teqnion Ab group

Surge Protection Devices Limited made £3.7m revenue and £1.7m profit in the year to 31 Dec 2025. read from filing text

Surge Protection Devices Limited’s revenue grew 7% to £3.7m in the year to 31 Dec 2025, with £1.7m profit and 10 employees. The company is classified under “other specialised construction activities” and is based in Oldham; we hold 4 years of its filed accounts.

Full P&L filedSection F · ConstructionSIC 43999Other specialised construction activities n.e.c.

Status: Active
Location: Oldham, North West
Age: 20 yrs · since 2006
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 Teqnion AB”

Latest accounts · year to 31 Dec 2025

Key figures

Capital-lightOperating leverageBoring industry

Revenue

£3.7m

Growth ▲6.6%

Profit

£1.7m

Growth ▲24.4%

Profit margin

46.5%

Gross 87.3%

Employees

Change ▲11.1%

Profit / employee

£173k

Revenue/employee £372k

Profitable streak

2yrs

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	No P&L	No P&L	Full P&Lread from filing text	Full P&Lread from filing text
Profit & loss
Revenue (turnover)	—	—	£3.5m	£3.7m
Cost of sales	—	—	£820k	£473k
Gross profit	—	—	£2.7m	£3.3m
Operating profit	—	—	£1.8m	£2.2m
Profit before tax	—	—	£1.8m	£2.2m
Profit after tax	—	—	£1.4m	£1.7m
Profit (best available)	—	—	£1.4m	£1.7m
Employees (average)	9	9	9	10
Ratios
Profit margin	—	—	39.8%	46.5%
Gross margin	—	—	76.5%	87.3%
Revenue per employee	—	—	£388k	£372k
Profit per employee	—	—	£155k	£173k
Growth (year on year)
Revenue growth	—	—	—	▲6.6%
Profit growth	—	—	—	▲24.4%
Headcount growth	—	0%	0%	▲11.1%
Balance sheet — indirect signals, not revenue
Cash at bank	£592k	£1.1m	£1.7m	£1.6m
Net assets	£544k	£1.6m	£2.9m	£3.4m
Fixed assets	£78.7k	£24.5k	£37.5k	£47.8k
Current assets	£1.1m	£2.2m	£3.9m	£3.9m
Debtors	£339k	£389k	£491k	£478k
Deferred income	—	£65.8k	£120k	—
Source	FullAccounts · bulk data Sep 2024	FullAccounts · bulk data Sep 2024	FullAccounts · bulk data Aug 2025	FullAccounts · bulk data Jul 2026

Derived from the latest filing

How the business works

Profit margin: 46.5%; Profit ÷ revenue.
Gross margin: 87.3%; Gross profit ÷ revenue. High for software and services.
Revenue per employee: £372k; Revenue ÷ average employees.
Profit per employee: £173k; Profit ÷ average employees.
Cash conversion: —; Cash generated from operations ÷ operating profit. Needs a cash-flow statement.
Fixed assets ÷ revenue: 1.3%; Capital intensity. Low = capital-light, cheaper to start.
Deferred income ÷ revenue: —; Customers paying upfront (subscriptions, deposits). Approximate when combined with accruals.
Debtors ÷ revenue: 12.8%; 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: ▲15%; Now £3.4m
Cash at bank: ▼5%; Now £1.6m
Headcount: ▲11%; Now 10
Deferred income: —; Now —
Fixed assets: ▲27%; Now £47.8k

Corporate ownership

Group structure

Ownership chain

Teqnion Ab (registered outside the UK register)ultimate parent75–100%
Teqnion UK Ltd75–100%
Surge Protection Devices Limitedthis company

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

Subsidiaries (1)

Consumer Units LimitedFigures not disclosed

Sister companies (10)

Abercromby Vending Ltd.Figures not disclosed
Avelair LimitedFigures not disclosed
Awarded 2U LimitedFigures not disclosed
Belle Coachworks Holdings LimitedFigures not disclosed
Birkett Bogmats LimitedRev. — · Profit £428k
HT Servo LtdFigures not disclosed
Merridale LtdFigures not disclosed
Teq Shanty LtdFigures not disclosed
UK Lanyard Makers LtdFigures not disclosed
Unique Door Panels LtdFigures 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 £1.7m), from the Companies House accounts bulk data published Jul 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.