Are my UK investments actually safe?

The 60-second answer

If you hold investments — shares, ETFs, funds, bonds — at an FCA-authorised UK broker or platform:

• Your investments themselves are not "FSCS-protected up to £85,000" in the way cash deposits are FSCS-protected up to GBP 120,000. That phrase is widely repeated but technically wrong when applied to shares, ETFs and funds.
• Your investments are protected by something different and usually more powerful: CASS rules (the FCA's Client Assets Sourcebook). Your shares are held by the broker as your agent, ring-fenced from the broker's own balance sheet, in a nominee account designed to survive the broker's failure.
• FSCS still has a role — it covers shortfalls or losses caused by the firm's own failings (failed reconciliation, fraud, missing client money), capped at £85,000 per person per firm.
• For pure cash sitting at the platform (uninvested cash in your S&S ISA / SIPP / GIA), FSCS protection depends on where the platform parks that cash — usually one or more third-party banks. Worth knowing.

The rest of this page explains why this matters, how it actually works in practice, and the practical things you should check on any platform you use.

The core distinction: CASS protects the assets, FSCS pays compensation

The two regimes do different jobs. The most common misconception is treating them as alternatives or competitors. They aren't — they're complementary, and most retail investors get the benefit of both.

Different problems, different tools

Imagine your broker fails tomorrow morning. There are two distinct things that could go wrong:

1. The broker goes bust but client assets are intact. CASS makes this the normal case. Your shares are still there in nominee, ring-fenced. An administrator transfers them to a new broker over weeks or months. You generally get your assets back in full. FSCS does not pay you a penny in this scenario because nothing is missing.
2. The broker goes bust and there's a shortfall in client assets. This is the rare bad case — caused by fraud, sloppy reconciliation, or lost paperwork. CASS has been broken. FSCS now steps in to compensate the shortfall, up to £85,000 per person.

So FSCS is the safety net under the safety net. CASS is supposed to make sure FSCS never has to pay out for an investment broker. When CASS works, you don't need FSCS for your shares.

How CASS actually works (the mechanics that matter)

The FCA's Client Assets Sourcebook — typically called CASS — is the rulebook every UK investment firm must follow when handling client money and client assets. The relevant chapters for retail investors are CASS 6 (custody assets — your shares, funds, ETFs) and CASS 7 (client money — your uninvested cash). The mechanics:

1. Segregation

Client assets must be held separately from the firm's own assets. In practice this means your shares are not on the broker's balance sheet. They are held in custody — usually with a regulated third-party custodian — under a nominee structure where the broker holds the legal title on your behalf. The broker doesn't own your shares; you do.

2. Statutory trust

Client money under CASS 7 sits in a statutory trust. The firm legally cannot use it for its own business. If the firm becomes insolvent, the trust takes precedence over the firm's other creditors — the money is yours, not part of the bankruptcy estate.

3. Reconciliation

Firms must reconcile internal records against external custodian records on a regular basis (daily for most retail platforms). Any discrepancy must be investigated and reported to the FCA. This is the audit trail that catches problems before they become catastrophic.

4. CASS audits

FCA-authorised firms must commission an annual independent CASS audit by a qualified auditor. The audit report is filed with the FCA. Firms that consistently fail audits get fined or have their permissions restricted — this is how regulators identify problem firms before they fail.

5. Wind-down planning

Firms holding client assets must maintain a "resolution and wind-down plan" — essentially a runbook for how the FCA could safely transfer client assets to another firm if this one collapsed. The 2018 special administration regime for investment firms was specifically designed around this transfer-out mechanism.

What happens to your S&S ISA if your broker fails — step by step

Take a concrete worry: you have £200,000 in a Stocks & Shares ISA at a UK broker, mostly in a global equity ETF and some individual shares. The broker collapses. What actually happens?

What does an "S&S ISA" actually look like under the bonnet?

The wrapper is a tax designation, not a separate account. Inside the broker's books:

• The shares and ETFs are held in the broker's nominee account with a third-party custodian (e.g. State Street, BNY Mellon, JPMorgan, or the broker's own approved custodian). Each unit of the ETF or each share is allocated to your client number. CASS 6 applies.
• Your uninvested cash sits in a CASS 7 client money account at one or more banks. The platform tells the FCA which banks. CASS 7 applies, and FSCS deposit protection of GBP 120,000 applies per eligible person, per authorised banking licence — so a platform sweeping cash across three separately authorised banks can diversify the bank-failure risk if a bank fails (not the platform).
• The "ISA" status is a flag on your account at the broker that tells HMRC any income/gains from these assets are tax-free. The broker reports this to HMRC each year. The status survives broker insolvency because the assets transfer with the wrapper intact.

The two FSCS numbers: GBP 120,000 for deposits, GBP 85,000 for investment compensation

The old one-number explanation is now wrong. FSCS has distinct limits depending on the product and the type of failure:

"Per banking licence" matters

A single banking group can hold multiple brands under one licence. A GBP 170,000 cash position split across two brands owned by the same group may still only be protected to GBP 120,000 because they share a licence. The FSCS protection checker shows which licence each brand sits under. Examples that catch people out:

• Halifax + Bank of Scotland + Birmingham Midshires share a single banking licence (Lloyds Banking Group's HBOS licence).
• HSBC + first direct + M&S Bank share the HSBC licence.
• NatWest + RBS + Ulster Bank GB share the NatWest Group licence.
• Santander + Cahoot share the Santander licence.

Cash sitting in your investment platform — the bit most people get wrong

Many UK investors don't realise that the cash in their S&S ISA waiting to be invested isn't "in the platform" in the same sense as a bank deposit. The platform is required to put it somewhere; under CASS 7, the somewhere is a regulated bank.

Most platforms diversify across two or three banks to reduce concentration in any one banking licence. Some platforms publish their bank list; others keep it under wraps but disclose it on request. The relevant document is usually the Client Money Notice or Order Execution & Custody Policy — every platform has one.

Worked example — £150,000 cash sitting uninvested

• Platform A sweeps client money to two separately authorised banks (HSBC and Barclays). Your GBP 150k is split GBP 75k / GBP 75k. If either bank fails, FSCS deposit protection should cover the GBP 75k balance fully because it is below the GBP 120k ordinary deposit limit. Total protection: GBP 150k. Good.
• Platform B sweeps all client money to a single bank. Your GBP 150k all sits with that one bank. If that bank fails, FSCS ordinary deposit protection is GBP 120k, so GBP 30k may be exposed. Worse.
• Platform C sweeps to a money-market fund instead of a bank. Money-market funds are not deposits and do not have FSCS deposit protection. They have CASS 6 custody protection (the units are held in nominee for you), so if the platform fails you get the units back. But if the money-market fund itself fails (rare but possible — see "breaking the buck" in 2008), there is no FSCS top-up for the loss in value. Different risk profile entirely.

Always check the Client Money Notice for any platform holding meaningful cash. The spread of banks is the single most useful thing to know.

Real cases — what happened when UK investment firms actually failed

It helps to know how the system has performed in practice. Here are three relevant UK examples:

Beaufort Securities (2018)

A mid-sized UK broker that collapsed in March 2018 amid an FBI fraud probe. £550 million of client assets and £50 million of client money were ring-fenced under CASS. The administrator transferred almost all client portfolios to a new broker (PSB Capital, then later to ITI Capital) over the following year.

The complication: PwC, as administrator, initially proposed levying administration fees against client assets to cover the cost of the wind-down. Public outcry plus FCA pressure ultimately reduced the per-client cost cap, and FSCS topped up affected accounts to make most retail clients whole. Outcome: virtually all retail investors got their assets back in full or near-full. Larger institutional clients with portfolios above £85k saw some haircut for administration fees beyond what FSCS covered.

SVS Securities (2019)

SVS was a smaller broker that went into special administration in August 2019 over conduct concerns. £700 million of client assets were ring-fenced. Transfers to ITI Capital were completed within ~7 months. FSCS funded administration costs above the £85k cap so that retail clients did not face fee deductions from their assets. Final outcome: full asset return for retail clients.

Reyker Securities (2019)

Specialist broker that went into special administration in October 2019. Around 9,500 clients with £900 million of assets. Smith & Williamson handled the wind-down; assets transferred to multiple new brokers over 18 months. Again, FSCS picked up administration cost above the cap so retail accounts didn't suffer haircuts. Most clients got their assets back, though the protracted timeline (17+ months in administration) was a real cost in foregone trading and deferred decisions.

By wrapper type — what protects what

Stocks & Shares ISA

• Underlying shares / funds / ETFs: CASS 6 segregation. Your assets are in nominee, ring-fenced. Not FSCS-capped because nothing is missing.
• Uninvested cash: CASS 7 client money + FSCS deposit protection (GBP 120,000 per eligible person, per authorised banking licence the platform sweeps to).
• If a shortfall is discovered: FSCS investment protection up to £85,000 per person per firm.
• ISA tax-free wrapper: survives broker insolvency; HMRC-recognised flag on the account that transfers with the assets.

SIPP (Self-Invested Personal Pension)

• Underlying investments: CASS 6. Same as S&S ISA.
• Cash within the SIPP: CASS 7 + FSCS deposit protection per banking licence.
• SIPP provider failure: Up to £85,000 of investment compensation per person per firm under FSCS investment protection.
• Important nuance: if the SIPP is held with an insurance-company-style provider (a personal-pension-on-an-insurance-platform structure), 100% protection with no cap may apply under the long-term insurance scheme. Most modern SIPPs are not structured this way — they are pure custody platforms — so the £85k cap usually applies for the SIPP wrapper, separately from CASS for the underlying.

Cash ISA / regular cash savings

• Cash deposit: Pure FSCS deposit protection, GBP 120,000 per eligible person per authorised banking licence.
• This is the simplest protection regime — no CASS, no investment compensation rules, no nominee accounts. Just deposit protection.

General Investment Account (GIA)

• Same as S&S ISA from a CASS / FSCS perspective. The only difference is the absence of the tax-free wrapper.

Innovative Finance ISA (peer-to-peer)

• The platform itself may be FCA-authorised but the underlying loans are not FSCS-protected. If borrowers default or the platform's loan book turns bad, you can lose money — and the loss is investment risk, not CASS or FSCS.
• If the IFISA platform itself fails, FSCS investment protection up to £85k may apply to platform losses (i.e. losses caused by platform failings, not by borrower defaults). Several IFISA platforms have failed; payouts have varied widely.
• Treat IFISAs as risk capital, not "savings".

Crypto and unregulated investments

• Most UK crypto exchanges (even the FCA-registered-for-AML ones) are not authorised firms for investment purposes. CASS does not apply. FSCS does not apply. If the exchange fails, your crypto is gone — there is no UK statutory recovery process.
• Some platforms now offer "FCA-authorised" crypto products under the new financial promotions regime, but the level of protection still typically falls short of CASS-protected investments. Read the Key Information Document for any specific product.

What to actually check on your platform

Three things, all available in five minutes:

1. FCA Authorisation

Search the platform's name on the FCA Register. The result tells you:

• Whether the firm is FCA-authorised (most retail platforms are; "registered" only is a much weaker status).
• Which permissions it holds (look for "Holding client money" / "Safeguarding and administering investments" — both required for an investment broker).
• Any historic enforcement actions or restrictions.

If a platform's regulatory status looks unclear, walk away. Don't rely on the platform's own claims.

2. Client Money Notice / Custody Policy

Every FCA-authorised platform publishes one — usually linked from the legal / disclosure page in the website footer. Look for:

• The custodian for your investments (a major name like State Street / BNY Mellon / JPMorgan / Northern Trust suggests a serious institutional custody arrangement).
• The list of banks where client cash is swept. Multiple banks = better diversification of FSCS deposit protection.
• Any disclosed CASS audit issues or qualifications.

3. Group structure and where your assets actually sit

Some platforms are owned by very large groups (HL, AJ Bell, Vanguard UK, Fidelity); others are smaller specialist firms. Larger platforms tend to have stronger custody arrangements and better wind-down planning, but the regulatory protection regime applies equally regardless of size. The relevant question is whether you trust the firm's operational integrity — not its asset size.

What CASS / FSCS does NOT protect against

Critical clarifications, because these are the misunderstandings that cause panic:

• Market falls. If the FTSE drops 30% your portfolio drops 30% (or whatever your beta is). No regulator compensates this. It's the investor's risk.
• Bad fund managers. If you bought into a fund that underperformed dramatically due to manager incompetence, that's not an FSCS-compensable claim unless there was a regulated wrong (mis-selling, misleading promotion, breach of duty).
• Cryptocurrencies and unregulated products. No CASS, no FSCS.
• Fraud you authorised. If you sent money to a scammer because they convinced you to do so, FSCS doesn't cover it — though the Authorised Push Payment (APP) scheme run by banks may apply for some bank-transfer scams.
• Loss because of your own decisions. Selling at the bottom, buying at the top, concentrating in one stock — all your own risk.
• Cyber breaches at your end. Phishing on your account, password reuse, lost devices — usually not FSCS-eligible.

Practical conclusions

1. Your shares and ETFs in a UK FCA-authorised platform are structurally well-protected. The system has been tested in real broker failures; CASS held up.
2. The GBP 85,000 figure now mostly matters for investment compensation claims, not ordinary cash deposits. For pure investment portfolios, the cap rarely bites because CASS makes the assets recoverable in full; for cash deposits, use the GBP 120,000 FSCS deposit limit.
3. If you hold material amounts of cash inside an investment platform, find out which banks the platform sweeps cash to, and don't let any one banking licence line item exceed GBP 120,000 of your money.
4. Diversifying across two or three FCA-authorised platforms is a sensible move once portfolios get large (£500k+). Not because any single platform is unsafe, but because operational disruption during a bulk-transfer process can take 6-18 months — during which you can't trade. Being able to fall back to a second platform reduces that disruption.
5. For pensions specifically, understand whether you have an FSCS-investment-protected SIPP (£85k cap) or a long-term-insurance-protected personal pension (potentially 100% with no cap) before you concentrate.
6. For peer-to-peer / crypto / unregulated products, treat them as risk capital that has no statutory safety net and size the position accordingly.

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