How much does Aion Silicon Limited make?

Aion Silicon Limited reported revenue of £11.2m and £15.3m profit in the year to 31 Dec 2025, according to its accounts filed at Companies House.

How many employees does Aion Silicon Limited have?

Aion Silicon Limited reported an average of 36 employees in the year to 31 Dec 2025.

Is Aion Silicon Limited profitable?

Yes — Aion Silicon Limited reported a profit of £15.3m in the year to 31 Dec 2025.

Company No. 04491953 · Incorporated 23 Jul 2002

Aion Silicon Limited

Registered name: AION SILICON LIMITED

Part of Rox Technologies Ltd group

Aion Silicon Limited made £11.2m revenue and £15.3m profit in the year to 31 Dec 2025.

Aion Silicon Limited’s revenue grew 42% to £11.2m in the year to 31 Dec 2025, with £15.3m profit and 36 employees. The company is classified under “other professional, scientific and technical activities” and is based in London; we hold 2 years of its filed accounts.

Full P&L filedSection M · Professional, scientific and technical activitiesSIC 74909Other professional, scientific and technical activities n.e.c.

Status: Active
Location: London, London
Age: 24 yrs · since 2002
Type: Private 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.

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: “Aion Silicon Holdings Limited”

Latest accounts · year to 31 Dec 2025

Key figures

Capital-lightDoing more with less

Revenue

£11.2m

Growth ▲42.1%

Profit

£15.3m

Growth —

Profit margin

136.1%

Gross 31.6%

Employees

Change ▼41%

Profit / employee

£424k

Revenue/employee £312k

Profitable streak

1yr

Consecutive profitable years in our data

Unusual figures. Profit is higher than revenue in this filing. That usually means investment income, dividends from subsidiaries or one-off gains — or a mis-tagged figure. Check the original filing before drawing conclusions.

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

2 filed years

Financial history

Multi-year financials, oldest to newest
Year to	31 Dec 2024	31 Dec 2025
Disclosure	Full P&L	Full P&L
Profit & loss
Revenue (turnover)	£7.9m	£11.2m
Cost of sales	£8.7m	£7.7m
Gross profit	−£847k	£3.5m
Operating profit	−£3.4m	£9.7m
Profit before tax	−£4.9m	£9.7m
Profit after tax	−£4.1m	£15.3m
Profit (best available)	−£4.1m	£15.3m
Staff costs	£4.8m	£3.2m
Employees (average)	61	36
Ratios
Profit margin	−51.7%	136.1%
Gross margin	−10.7%	31.6%
Revenue per employee	£129k	£312k
Profit per employee	−£66.9k	£424k
Growth (year on year)
Revenue growth	—	▲42.1%
Headcount growth	—	▼41%
Balance sheet — indirect signals, not revenue
Cash at bank	£447k	£3.2m
Net assets	−£35m	£4.9m
Fixed assets	£152k	£138k
Current assets	£6.7m	£12.7m
Debtors	£610k	£242k
Deferred income	£1.7m	£4.4m
Source	FullAccounts · bulk data Jul 2026	FullAccounts · bulk data Jul 2026

Derived from the latest filing

How the business works

Profit margin: 136.1%; Profit ÷ revenue.
Gross margin: 31.6%; Gross profit ÷ revenue. High for software and services.
Revenue per employee: £312k; Revenue ÷ average employees.
Profit per employee: £424k; Profit ÷ average employees.
Cash conversion: —; Cash generated from operations ÷ operating profit. Needs a cash-flow statement.
Fixed assets ÷ revenue: 1.2%; Capital intensity. Low = capital-light, cheaper to start.
Deferred income ÷ revenue: 39.7%; Customers paying upfront (subscriptions, deposits). Approximate when combined with accruals.
Debtors ÷ revenue: 2.2%; 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 £4.9m
Cash at bank: ▲622%; Now £3.2m
Headcount: ▼41%; Now 36
Deferred income: ▲155%; Now £4.4m
Fixed assets: ▼9%; Now £138k

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

Rox Technologies Ltdultimate parent50–75%
Aion Silicon Holdings Limited75–100%
Aion Silicon Limitedthis company

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

Sister companies (1)

Sondrel Ventures LimitedRev. £28.8k · Profit −£3.4k

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 Dec 2025 (profit £15.3m), 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.