UK AIFM regime changes: how the UK is rewriting the rules of proportionality in asset management

With the UK AIFM regime changes proposed by the FCA, asset management in the United Kingdom is undergoing its most profound regulatory evolution in over a decade. For years, UK fund managers have operated within a regulatory perimeter largely inherited from the European Union’s Alternative Investment Fund Managers Directive (AIFMD). Drafted in the immediate aftermath of the 2008 global financial crisis, the AIFMD was a legislative reaction designed primarily to rein in systemic, highly leveraged funds. The consequence  was the creation of a “one-size-fits-all” framework. This system invariably caught smaller, unleveraged, and less complex funds in a wide net of compliance, governance and reporting burdens – some even say, disproportionate.

The landscape is now decisively shifting. Last week, the Financial Conduct Authority (FCA) released two highly anticipated and interconnected Consultation Papers: CP26/26 on Fund Reporting for Asset Management Entities (FRAME) and CP26/28 on the UK AIFM Regime. Together, these documents signal a deliberate and strategic divergence from the legacy EU framework:

“Much of the current UK framework for AIFMs is derived from EU law, specifically the Alternative Investment Fund Managers Directive (AIFMD), which was retained in UK law after the UK left the EU. The framework has become complex… Requirements have become dated… Our aim is to make the rules more proportionate to firms’ size and activities, and to better match the rules to firms’ risks.”  (https://www.fca.org.uk/publications/consultation-papers/cp26-28-uk-aifm-regime)

By stripping away convoluted leverage formulas and replacing them with clear, objective Net Asset Value (NAV) thresholds, the FCA is fundamentally rewriting the rules of proportionality. The overarching message is clear: the UK is positioning itself as a pragmatic, risk-based regulator that prioritises market growth and international competitiveness without sacrificing consumer protection or market integrity.

Here is what this divergence means for the future of UK asset management, how the reporting and categorisation landscapes will transform and what compliance teams and C-suite executives need to understand as we move toward the 2028 implementation date.

The legacy: a system built for systemic risk

To appreciate the scale of the FCA’s proposed reforms, one must first understand the operational friction embedded in the current regime. Under the legacy AIFMD framework, determining a firm’s regulatory category (and its subsequent reporting obligations) involves complex calculations that factor in leverage, lock-up periods and assets under management (AUM).

For many firms, the cost of compliance has been significant. The FCA’s own cost-benefit analysis estimates that the current cost to a firm of producing just one regulatory report (such as the notoriously difficult AIF002 return under Annex IV) is approximately £3,400. Over multiple funds, reporting multiple times per year over a decade, this administrative friction extracts a massive toll on the market, tying up capital that could otherwise be passed on to consumers or reinvested in the real economy.

Furthermore, the existing thresholds create severe “cliff-edge” effects. As soon as a small AIFM crosses the threshold to become a full-scope AIFM, it is immediately hit with a raft of onerous regulatory requirements, acting as a disincentive for growth. The FCA’s data shows that out of 21,684 AIFs currently reporting, the vast majority are subjected to reporting templates that are overly complex and not aligned with current supervisory needs.

The UK’s divergence relies on the principle that a £100 million unleveraged real estate fund does not pose the same systemic risk to the financial ecosystem as a £5 billion highly leveraged hedge fund. And therefore, it should not be regulated or expected to report as if it does.

Redefining the AIFM: the new 3-tier structure (CP26/28)

The most structural shift in the FCA’s approach is how it will categorise AIFMs moving forward. In CP26/28, the FCA outlines a complete departure from the complex, leverage-based metrics used to determine a firm’s size classification. Instead, the regulator is moving to a straightforward, 3-tier system based entirely on Net Asset Value (NAV).

The FCA explicitly outlines its rationale for this structural shift:

“Our proposals update the size thresholds and introduce a new 3-tier structure – small, medium and large – with a graduated application of the rules, replacing the current approach. Greater flexibility should help firms compete, innovate, and do cross-border business.”

Under the new rules, the dividing lines will be set as follows:

• Small AIFMs: firms managing AIFs with an aggregate NAV of below £750 million.
• Medium AIFMs: firms managing AIFs with an aggregate NAV between £750 million and £5 billion.
• Large AIFMs: firms managing AIFs with an aggregate NAV of over £5 billion.

To calculate this, an AIFM must simply aggregate the NAV of all the AIFs it manages (including both CIS and non-CIS AIFs).

Eradicating the “cliff-edge”

Crucially, the FCA is introducing mechanisms to smooth the transition for growing firms, eradicating the dreaded cliff-edge effect. When a firm crosses a size threshold, it will no longer have to undergo an application process to vary its permissions; instead, it will simply notify the FCA.

To allow for operational adjustment, a firm that grows into a new size classification will have six months to comply with its new general obligations. Most notably, if a growing firm transitions from a small to a medium AIFM – which triggers the requirement to appoint a depositary – the firm will be granted an extended 12-month grace period to complete the selection and appointment process. This pragmatic grace period acknowledges the commercial realities of onboarding third-party service providers.

The ALTS sourcebook

To make this new tiered system easier to navigate, the FCA proposes consolidating most rules into a new, dedicated Alternative Investment Funds sourcebook (ALTS). This will bring the rules for managers of unauthorised funds together in one place, making the regime more coherent, easier to enter and quicker for the FCA to update in the future.

Proportionality at the fund level: entering the ‘FRAME’ era (CP26/26)

While CP26/28 redefines proportionality at the firm level, CP26/26 applies this same philosophy to the daily operational reality of fund reporting.

The EU’s AIFMD Annex IV reporting framework is set to be decommissioned in the UK, replaced by a unified, digital-first system called Fund Reporting for Asset Management Entities (FRAME). FRAME is built on three core principles: simplicity, proportionality and international alignment.

The FCA is drawing a clear, objective line in the sand to dictate reporting intensity for individual funds. As CP26/26 states:

“We are proposing that managers will submit a set of ‘essential’ reporting requirements for each fund under £500 million net asset value (NAV). For funds over £500 million NAV, managers will be required to submit more extensive ‘enhanced’ requirements.”

This means the UK is building a tailored, granular system. A firm might be classified as a medium or large AIFM overall, but it will still benefit from lighter, streamlined essential reporting on any of its smaller, individual funds that sit below the £500 million NAV mark.

The reduction in the compliance burden is telling. The FCA’s detailed field-level comparison found that moving from the current AIF002 return to the proposed “essential” reporting requirement will reduce the reporting effort by 90.8%.

Overall, the FCA estimates that around 90% of AIFs in the market (over 19,000 funds) will only need to submit the essential requirements. Consequently, the FCA anticipates that these changes will yield a net benefit to AIFs of approximately £147.8 million per year in reduced compliance costs.

To help firms manage fluctuations in fund size, the FCA is also introducing a “time cushion”. Funds reporting quarterly will have two quarters, and annual reporters will have a full year, before they must step up to “enhanced” reporting after crossing the £500m threshold. Firms will also have the ability to voluntarily “opt-up” to enhanced reporting if they prefer maintaining a single, consistent reporting standard across their entire portfolio.

The end of Gross and Commitment leverage methods

One of the most celebrated areas of UK divergence from the EU regime is the FCA’s approach to leverage. Under the legacy AIFMD rules, managers are forced to compute two highly prescriptive measures of leverage – the Gross and Commitment methods – and report these both to the regulator and to their investors.

Industry consensus has long held that these measures are overly complicated, open to misinterpretation and ultimately fail to accurately represent a firm’s true leverage risk. For example, as the FCA explicitly acknowledges in CP26/26, the Gross and Commitment methods “are complicated, open to interpretation, and useful only at a very high level, as they attempt to ‘add up’ different types of leverage.” Because they just blindly add up exposures, they create a blunt metric that makes it virtually impossible to compare the true risk profiles of vastly different strategies, such as a high-frequency derivative hedge fund versus a debt-financed private equity buyout.

The UK is definitively scrapping these mandated calculations.

Instead of a “one-size-fits-all” leverage calculation, the FCA will require firms to disclose the quantum of their leverage to investors using a method (or methods) that is best suited to their specific fund and investment strategy. As long as the disclosure is clear, fair and not misleading, fund managers will have the flexibility to contextualise their leverage in a way that actually makes sense to their professional investors.

For regulatory reporting under FRAME, rather than relying on a single complex calculation, the FCA will collect raw, underlying data on gross notional exposures, counterparties and sensitivities. This allows the regulator to build its own picture of systemic leverage risk across the market, rather than forcing firms to run arbitrary compliance math.

Smarter, not weaker: targeted supervision and event-based reporting

A common critique of proportionality is the fear that it equates to deregulation or weakened oversight. The FCA is highly eager to dispel this notion. The UK’s strategy is not about looking away; it is about looking in the right places.

As the FCA robustly defends in CP26/26:

“Proportionality does not mean lowering expected standards in relation to consumer protection or market integrity; it means that reporting obligations should be set according to the scale of risk.”

By freeing up resources previously wasted on processing low-value data from low-risk funds, the FCA aims to become a “more targeted, better informed, smarter regulator”.

To ensure market stability, the FCA is introducing sophisticated mechanisms for rapid intervention. Chief among these is the introduction of Event-Based Reporting (EBR) for hedge funds. While hedge funds will generally report on a quarterly basis (with a 45-day lag to provide recent data), those managing over £500m NAV will be subject to a strict EBR trigger.

If a hedge fund experiences a 10% drawdown (a holding period return loss of -10% over 10 business days), the firm must notify the FCA within 72 hours. Following this trigger, the firm must supply critical daily data for the next five business days, including details on unencumbered cash, the proximity of counterparty performance triggers and internal risk reports.

This ensures that the FCA receives high-fidelity, real-time data exactly when it matters, rather than waiting months for the next quarterly reporting cycle.

A strategic advantage for the UK

The shift away from the EU’s legacy AIFMD framework represents a watershed moment for the UK asset management sector. By replacing leveraged AUM calculations with clear NAV thresholds, decommissioning the dreaded Annex IV returns in favour of the streamlined FRAME system, and scrapping arbitrary leverage formulas, the FCA is actively tearing down the barriers to entry that have historically stifled smaller and mid-sized managers.

As the FCA explicitly notes, these reforms are a testament to the UK’s commitment to building a regulatory framework that actively “promotes growth and international competitiveness”. The changes acknowledge a fundamental reality of modern finance: regulatory burden must be inextricably linked to the scale of risk.

With the FCA aiming to publish the final rules in the first half of 2027 and targeting full implementation by 2028, the clock is ticking for the industry to prepare.

For compliance teams, Chief Operating Officers and fund managers, the directive is clear: begin assessing your portfolios against the new £500m fund thresholds and the £750m/£5bn firm-level tiers today. The end of the “one-size-fits-all” era is not just a regulatory update; it is a strategic repositioning of the UK as the most agile, pragmatic and competitive hub for global asset management.