A third-party AIFM is the regulated layer that many Luxembourg fund launches rent instead of building internally. The sponsor keeps the economic project, the investor relationship and, depending on the model, a role in investment execution. The authorised AIFM platform supplies the regulated manager function, risk-management framework, compliance infrastructure and, where relevant, access to the EU marketing passport.

This route is central to the Luxembourg fund market because many first funds are too small or too early to justify a proprietary authorised AIFM. The alternative is not only legal. It is operational. Building an authorised manager requires capital, approved conducting officers, substance, policies, reporting, CSSF interaction and a governance framework that can take months to approve. Appointing a platform compresses that layer into an external provider relationship.

What the third-party AIFM does

The AIFM is not a decorative appointment. Under the AIFM framework, the manager is responsible for portfolio management and risk management, alongside the wider control environment around valuation, liquidity, delegation, conflicts, reporting and investor disclosure.¹ A third-party AIFM therefore reviews the fund before launch and monitors it after launch.

In practice, the platform examines the investment strategy, target assets, leverage, valuation policy, investor base, service-provider bench and proposed delegation model. It will also review the limited partnership agreement, offering document, side-letter framework and operating calendar. The sponsor should expect a real onboarding process, not a signature page at the end of the legal drafting.

The exact split of responsibilities varies. Some platforms keep portfolio and risk management internally. Others delegate portfolio management while retaining risk management and oversight. In all cases, the AIFM remains responsible for the AIFM functions and must be able to evidence supervision. A sponsor that wants full investment discretion must therefore choose a platform whose delegation model matches the intended operating reality.

When the platform route is required or useful

The clearest mandatory case is the RAIF. A Luxembourg RAIF must be managed by an authorised external AIFM.² This is the price of the RAIF model: no CSSF product approval at launch, but a regulated manager and a regulated service-provider architecture from day one. The article on the Luxembourg RAIF covers that wrapper in detail.

The second case is passported marketing. A registered sub-threshold AIFM can be efficient for a compact, domestic or privately placed investor base, but it does not provide the same EU marketing passport. When the commercial plan depends on raising across several EU jurisdictions, the authorised AIFM route becomes part of distribution strategy, not only compliance.

The third case is institutional acceptance. Some investors, administrators, depositaries or banks prefer a recognised third-party AIFM because it brings independent controls, established reporting and a known escalation framework. For first-time managers, that credibility can reduce execution risk even where a lighter structure might technically be possible.

Registered AIFM, own authorised AIFM or platform

The registered AIFM route is available below the AIFMD thresholds: EUR 100 million of assets under management, or EUR 500 million for unleveraged, closed-ended funds without redemption rights for five years.¹ It is cheaper and lighter, but it does not fit a RAIF and does not deliver the full passport. It can work for a plain SCSp with a limited investor base and a controlled fundraising perimeter.

Building an own authorised AIFM is a different project. It requires minimum own funds, governance substance, approved managers and a CSSF authorisation file. The route can make sense for a sponsor with several products, a long-term Luxembourg platform strategy and enough assets to absorb fixed regulatory cost. It is rarely the fastest route for a first fund.

The third-party AIFM sits between those two options. It is more expensive than registration, but faster than building an authorised manager. It also moves a large part of the regulated infrastructure onto a provider that already has policies, people and systems in place. The AIFM regime guide compares the three routes in more detail.

Route	Best fit	Main trade-off
Registered sub-threshold AIFM	small plain SCSp, limited investor base	lower cost, no full passport, no RAIF
Third-party authorised AIFM	RAIF, first institutional fund, passport need	recurring platform fee and provider oversight
Own authorised AIFM	scaled sponsor platform	highest setup burden, long authorisation timeline

Cost and onboarding impact

The AIFM line is often the largest recurring provider cost in a small RAIF budget. Pricing usually combines an onboarding fee, an annual minimum and a basis-point fee on net assets. The headline basis-point rate is not the whole story. For a EUR 20 million or EUR 30 million first fund, the minimum fee often dominates the economics.

The platform also affects timing. Onboarding requires AML/KYC on the sponsor, GP and key persons, review of the investment strategy, conflict analysis, service-provider coordination and negotiation of the AIFM agreement. If the AIFM is chosen late, the platform may require changes to the LPA, offering memorandum, valuation policy, delegation wording and risk disclosures. Late selection is therefore a common cause of launch delay.

A serious launch budget should place the AIFM route next to fund administration, depositary, audit, tax compliance and the GP’s own accounts. The article on Luxembourg fund setup costs explains why the annual run-rate matters more than the one-off setup quote.

Delegation and sponsor role

The appointment of a third-party AIFM does not automatically remove the sponsor from investment work. The sponsor may act as investment adviser, delegated portfolio manager or internal deal team supporting the AIFM, depending on authorisations and the platform’s model. The difference matters. Advisory language, delegation language and decision-making language create different regulatory and liability outcomes.

The key point is control. The AIFM must understand the assets, challenge the process, monitor risk and evidence oversight. A private equity sponsor that expects the AIFM to rubber-stamp deals will usually face friction. A sponsor that provides a clean investment memorandum, valuation support, conflicts analysis and transaction documentation gives the platform the material needed to discharge its role.

This is especially relevant in structures with acquisition SPVs below the fund. The AIFM sees the fund-level risks, but the deal layer still needs accounting, corporate approvals, financing documents and tax monitoring. That work often sits with a dedicated Private Equity SPV mandate rather than inside the AIFM agreement.

The RAIF decision

The RAIF is often chosen because it combines speed, Luxembourg familiarity and institutional recognition. It does not require prior CSSF product approval, but it does require an authorised external AIFM, a depositary, an auditor and a fund administration setup.² The AIFM decision is therefore inseparable from the RAIF decision.

For a sponsor with a small number of known investors, a plain SCSp managed below the AIFMD thresholds may be enough. For a sponsor raising from institutional LPs across several jurisdictions, the RAIF plus third-party AIFM route may be commercially stronger despite the fixed cost. The comparison is not about elegance. It is about investor expectation, distribution perimeter, annual budget and speed to first close.

The article comparing RAIF and plain SCSp should normally be read before platform discussions begin. Choosing the wrapper first and discovering the AIFM cost later is the wrong sequence.

Questions to ask before selecting a platform

A platform review should cover more than price. The following points usually determine whether the relationship will work in practice.

• The strategies and asset classes already supported by the platform.
• The exact split between portfolio management, risk management and investment advisory work.
• The minimum annual fee, onboarding fee and basis-point fee, including thresholds and breakpoints.
• The service providers accepted by the platform, especially depositary and administrator.
• The reporting cadence expected from the sponsor and the GP.
• The platform’s approach to side letters, co-investments, warehousing and SPV layers.
• The timeline from complete onboarding file to launch approval.
• The impact of AIFMD II implementation on policies, liquidity tools and disclosures where relevant.³

These points should be discussed before signing the fund documents. A third-party AIFM is not merely an outsourced name. It is a central operating partner for the fund’s life.

The practical conclusion

A third-party AIFM is often the right answer when a fund needs the RAIF wrapper, passported distribution, institutional comfort or a fast authorised-manager solution. It is usually the wrong answer when the only objective is to make a small first fund look more sophisticated than its economics can support.

The decision belongs inside the fund-formation plan, alongside the SCSp or RAIF wrapper, the GP company, the administrator, the depositary, the audit, the tax cycle and the SPV layer. A first estimate for the Luxembourg corporate tax layer can be prepared through the Luxembourg tax simulator, then refined as part of the provider budget. Treating all of those choices together is the purpose of a coherent Luxembourg fund formation mandate.

Footnotes

1. Law of 12 July 2013 on alternative investment fund managers, including the registration thresholds and authorised AIFM framework, available on Legilux. ↩ ↩²

2. Law of 23 July 2016 on reserved alternative investment funds, including the requirement for an authorised external AIFM, available on Legilux. ↩ ↩²

3. CSSF communication on Luxembourg implementation of Directive (EU) 2024/927, with AIFMD II changes applying from 16 April 2026, published by the CSSF. ↩