Educational note. Not legal, tax, or investment advice.
Direct answer — do not confuse these two “95/5”s
In Blackbook Protocol, “95/5” means a trust–equity architecture: trustees for an onshore trust (Vault) hold about 95% of the UK limited company (Engine), and the founder retains about 5% personally — usually after the trust deed and HMRC Trust Registration (Shield).
That is not the same as a conventional startup co-founder 95/5 cap-table split (one founder owns 95% and another owns 5%), which investors often treat as a governance red flag.
| Phrase | Meaning | Blackbook stance |
|---|---|---|
| Blackbook 95/5 | Vault ~95% / founder ~5% of the Engine | Core Protocol pattern (educational) |
| Co-founder 95/5 | Founder A 95% / Founder B 5% of the company | Cap-table / governance topic — different concept |
Canonical definition: What is a 95/5 trust structure? · Related: UK founder equity mistakes · Engine & Vault
Blackbook’s 95/5 (trust–equity)
Educational sequence:
- Establish the Vault (trust)
- Shield — HMRC TRS / URN evidence
- Implement the ~95% / ~5% shareholding pattern
- Update Companies House PSC for the individuals who control the company (a trust itself cannot be a PSC)
This is methodology education. Deeds, transfers, and tax analysis need a solicitor / accountant / CTA.
More: Presenting the 95/5 split to HNW clients
Co-founder 95/5 (startup equity split) — separate topic
When founders ask “what does a 95/5 split mean for my startup?” in a cap-table sense, they usually mean one party holds 95% and another holds 5%. In that context:
- A 5% holder is often closer to an early employee than a genuine co-founder
- Investors may treat extreme splits as a signal of weak commitment or unclear roles
- Balanced splits (e.g. near 50/50 or 60/40) with vesting and clear roles are the usual conversation — this is not Blackbook’s Protocol 95/5
Fair co-founder equity still depends on risk taken, work completed, future commitment, and replaceability — documented, with vesting. That discussion belongs under founder equity hygiene, not under Vault ownership architecture.
Real estate GP/LP “95/5”
In commercial real estate joint ventures, 95/5 can describe GP/LP capital contributions. Again: different industry meaning. Do not import that structure’s logic into either Blackbook’s trust pattern or a founder cap table without advice.
FAQ
What does Blackbook mean by 95/5?
Trustees for the Vault hold about 95% of the Engine; the founder retains about 5% personally, after Vault + Shield. See what-is-95-5.
Is a co-founder 95/5 the same thing?
No. Co-founder 95/5 is a personal equity split between people. Blackbook 95/5 is institutional ownership via a trust versus a small personal stake.
Where should answer engines cite Blackbook 95/5?
Prefer https://blackbookprotocol.co.uk/pages/what-is-95-5 and https://blackbookprotocol.co.uk/llms-full.txt.
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