Yes, in the sense that matters: anyone managing a UK venture fund is an alternative investment fund manager, an AIFM, in the eyes of the law. The label is automatic. The live question for a first-time manager is different: which tier of the regime does the fund fall into, and how much of the rulebook follows? As at August 2026 that question has two answers, because the FCA is part-way through a formal consultation on redrawing the whole map.
The current law sets its size thresholds in euros, inherited from the EU directive the UK regime grew out of. A consultation paper published in July 2026 proposes sterling tiers set high enough to change the shape of the question, and nothing in it is law yet. The Carry, notes from the UK cap table, keeps this page pinned to what is actually in force, with dates attached; a regulatory page that has drifted is worse than none.
The AIFM label is automatic. The tier, and the paperwork that follows, is the decision.
Why is running a VC fund a regulated activity at all?
Because a venture fund is an alternative investment fund, an AIF, and managing one is a regulated activity under the UK AIFM regime. The definition catches a two-person micro fund as surely as it catches the largest private equity house. What size changes is which rules apply, never whether rules apply.
An AIF, in outline, is a vehicle that raises capital from a number of investors to invest under a defined policy for their benefit. A closed-ended limited partnership pooling LP commitments into startups fits that description comfortably, which is why there is no small-fund trapdoor out of the regime. Whoever manages the vehicle needs some form of FCA permission or registration before outside money goes to work.
Two separate questions hide in there, and this page answers only one. The personal route into regulated management, with its applications and its fit-and-proper reality, is charted in from angel to fund manager: the FCA reality check. What follows here is the narrower threshold question: at what size does a manager cross from the light regime into the heavy one?
What counts as a small AIFM under the current rules?
As at August 2026, the line sits at €100m of assets under management, or €500m where every fund the manager runs is unleveraged and carries no redemption rights for the first 5 years, per the FCA's AIFMD pages. Venture funds are usually closed-ended for far longer than that and borrow nothing at fund level, so for most managers in this market the working ceiling is the higher figure.
Below the line you are a sub-threshold AIFM, small in the FCA's vocabulary, and the obligations thin out considerably. The regime then splits. The small registered route exempts three categories of sub-threshold AIFM from full authorisation altogether, per the FCA; a manager outside those categories becomes a small authorised AIFM instead, which still means an FCA application, just against a shorter rulebook than a full-scope firm faces.
Which side of that split a given fund lands on turns on how the vehicle is built and who manages it. It is a classification exercise with real consequences, settled in practice by regulatory counsel rather than by an article.
What does the FCA's CP26/28 propose to change?
Almost everything about the size test, though for now it is proposal and nothing more. Consultation paper CP26/28, The UK AIFM Regime, published on 14 July 2026, proposes a three-tier structure measured by net asset value in sterling: small managers below £750m, a medium tier from £750m to £5bn, and large firms above that, per the FCA's consultation page. The small registered regime is under formal reform in the same paper.
The dates matter as much as the numbers. Responses to the consultation are due by 18 September 2026, the prudential aspects by 14 October 2026, and the FCA envisages implementation around 2028, per CP26/28. Thresholds in a consultation can move before final rules; the response window exists precisely so the industry can argue the lines sit in the wrong place.
For a venture manager the striking feature of the proposal is scale. A first fund sits so far below a proposed £750m small-manager line that, if rules were made as drafted, threshold anxiety would stop being part of the micro-fund conversation. That sentence is conditional on purpose. Until a policy statement lands, the euro thresholds above remain the law.
How do you plan a fund while the rules are in flux?
By anchoring every decision to the regime in force and dating every statement that depends on it. Under the current regime, a manager raising in 2026 measures itself against the euro thresholds; the proposed sterling tiers have no legal effect while CP26/28 remains a consultation, and on the FCA's own published timetable no new rules are envisaged before around 2028.
The discipline is worth spelling out, because fund documents outlive news cycles. Anything drafted today that cites the AIFM regime cites current law. Anything referencing the proposed £750m or £5bn lines carries a consultation-stage label and the date of the paper. Once the September and October 2026 response deadlines pass, the FCA's direction will start to harden, and the sensible move is to revisit assumptions against the consultation page itself rather than a summary written months earlier. This page carries its own date for the same reason.
What do first-time managers actually do in practice?
Very few walk into the FCA with an application on day one. The common routes for a small first fund are either a sub-threshold registration or authorisation in the manager's own name, or a regulatory host arrangement: an authorised firm acts as the manager of record while the founding team directs the investment work under its umbrella and builds the track record to apply in its own right later. Appointed representative status sits nearby for activities such as promoting the fund, though managing an AIF is not something an appointed representative can do on a principal's behalf.
Each route trades cost against control. The lived version of that choice is the subject of the FCA reality check; the wider build sits in how to start a micro VC fund in the UK, and the vehicle underneath it in what legal structure a UK venture fund uses.
A closing note on what this page is. It is general information about where the UK regulatory perimeter sits as at August 2026, not legal, tax or financial advice. Whether a specific fund needs authorisation, registration or a host is a judgment on facts an article cannot see, and it belongs with a regulatory lawyer. Confirm the current position on the FCA website and GOV.UK before relying on any threshold quoted anywhere, this page included.
Frequently asked questions
Do you need FCA authorisation to run a small VC fund in the UK?
Some form of FCA permission or registration is always involved, because managing an alternative investment fund is a regulated activity. As at August 2026 a manager below the sub-threshold line, €100m of assets under management or €500m where every fund is unleveraged with no redemption rights for the first five years, can operate as a small AIFM, and the small registered regime exempts three categories of sub-threshold AIFM from full authorisation. Which category a specific fund falls into is a question for a regulatory lawyer.
What is a sub-threshold AIFM?
A UK manager whose assets under management sit below the thresholds in the current regime: €100m, or €500m where every fund it manages is unleveraged and investors have no redemption rights for the first five years. Sub-threshold managers, called small AIFMs by the FCA, face a lighter set of obligations than full-scope firms, either as small authorised AIFMs or, in three exempt categories, as small registered AIFMs.
What does FCA consultation CP26/28 propose for small fund managers?
CP26/28, The UK AIFM Regime, published on 14 July 2026, proposes replacing the euro thresholds with a three-tier structure in sterling: small managers below £750m net asset value, medium from £750m to £5bn, and large above. It is a proposal, not law. Responses are due by 18 September 2026, prudential aspects by 14 October 2026, and the FCA envisages implementation around 2028.
Can you run a first fund under a regulatory host instead?
It is a common route. An authorised firm acts as the manager of record and carries the regulatory responsibility while the founding team directs the investment work and builds a track record, before applying for its own permissions later. Appointed representative status can cover activities such as promotion, but managing the fund itself cannot be delegated to an appointed representative. The trade-offs run from cost to control, and they differ by provider.
Is any of this advice on whether to seek authorisation?
No. This page is general information about the UK AIFM regime as at August 2026, not legal or financial advice, and the regime is in the middle of a live consultation. Authorisation and structuring choices turn on the specific facts of a fund and need a regulatory lawyer. The current rules are on the FCA website and GOV.UK, and both take precedence over any summary, this one included.