−£154k
vs Oct 2024Active15218868Private limited companyCambridge
SI-FLUX LTD
Significant control: John Antonio Herrero-Smith (50–75%), Langley International Investments Limited (25–50%)
From public filings as at 31 Aug 2026; may contain errors or be out of date. Verify at Companies House · Terms
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What does Si-Flux Ltd sell?
Registered activity: Other research and experimental development on natural sciences and engineering (SIC 72190). We’re building product and service lists for UK companies. Get this one when it’s ready.
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01
Summary
SI-FLUX LTD is an active private limited company (company number 15218868) incorporated on 18 October 2023, registered in Cambridge. Its registered activity is other research and experimental development on natural sciences and engineering (SIC 72190). Latest small accounts cover the period ending 31 October 2025, showing net assets of −£154k and cash of £1,316, with 1 employee on average. Net assets fell 67% on the prior period (−£93k).
Peer position · net assets
By net assets it sits in the bottom quarter of 193 comparable companies in Cambridge (median £6,914, upper quartile £134k).
02
Ownership and control
- Dr John Antonio Herrero-Smith
- owns 50–75% of shares
- holds 50–75% of voting rights
- can appoint or remove directors
- Langley International Investments Limited
- owns 25–50% of shares
- holds 25–50% of voting rights
Persons with significant control hold 25% or more of shares or voting rights. Smaller shareholdings are only listed in confirmation-statement documents. Directors and secretaries: see the officers list at Companies House.
03
Key dates
- Incorporated
- 18 October 20233 yrs ago
- Next accounts due
- 31 July 2027in 277 days
- Confirmation statement due
- 1 November 2026in 5 days
Due dates are expected from Companies House filing rules; confirm on the official register before relying on them.
04
Activity
- SIC 72190
- Other research and experimental development on natural sciences and engineering
- Accounts type
- Total Exemption Full
- Size band
- MicroCompanies Act thresholds
05
Financials
£1,316
+108%vs Oct 2024Not reported
1
No changevs Oct 2024| Period end | Net assets | Cash | Debtors | Creditors <1y | Turnover | Profit | Employees |
|---|---|---|---|---|---|---|---|
| 31 October 2025 | −£154k | £1,316 | £0 | — | — | — | 1 |
| 31 October 2024 | −£93k | £634 | £14k | — | — | — | 1 |
Cash per employee£1,316Cash ÷ average employees
Figures as filed in iXBRL accounts at Companies House. "—" means the line was not reported in that filing.
06
Filing and accounts signals
- Net assets below zeroNet assets £-154,213 at 31 October 2025
- Net assets down 25% or more on the prior period-66.6% vs prior period
- Incorporated two to five years agoIncorporated 18 October 2023
Neutral facts read from the register and filed accounts, each with its evidence. They are not a rating, a prediction or advice, and may be incomplete or out of date. How each signal is derived.
07
Timeline
- Next accounts duein 277 days
- Confirmation statement duein 5 days
- Accounts period endNet liabilities £154k · small accounts
- Accounts period endNet liabilities £93k · small accounts
- Incorporated
08
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All companies incorporated on 18 October 2023 · in Oct 2023.
09
Reminders for SI-FLUX LTD
Get an email before each filing deadline — accounts and confirmation statement — so nothing is late.