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 not yet organised to maintain 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 places that layer within an established 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 The model combines the absence of CSSF product approval at launch with 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 has a narrower regulatory perimeter, 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 an internal organisation able to sustain the regulated functions. It is rarely the fastest route for a first fund.
The third-party AIFM sits between those two options. It provides the authorised framework without requiring the sponsor to build that framework internally. 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 | narrower framework, no full passport, no RAIF |
| Third-party authorised AIFM | RAIF, first institutional fund, passport need | external platform governance and provider oversight |
| Own authorised AIFM | scaled sponsor platform | highest setup burden, long authorisation timeline |
Operating model and onboarding impact
The AIFM mandate is a central part of a RAIF operating model. Its scope should be read together with the administrator, depositary, audit, tax and GP workstreams so that responsibilities, reporting inputs and escalation paths are complete and do not overlap.
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.
The AIFM route interacts with fund administration, depositary, audit, tax compliance and the GP’s own accounts. The Luxembourg fund setup sequence and timeline explains those dependencies.
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 addresses fund-level risks, while the deal layer retains its own accounting, corporate, financing and tax obligations.
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 align more closely with the required governance and distribution perimeter. The comparison is not about elegance. It is about investor expectation, regulatory responsibilities and speed to first close.
The RAIF and plain SCSp comparison sets out how the wrapper changes the required AIFM perimeter.
Platform selection criteria
A platform review covers the full operating relationship. Its existing strategies and asset classes, the split between portfolio management, risk management and investment advice, and the allocation of responsibilities and escalation procedures determine whether the model fits the fund.
The review also covers accepted depositaries and administrators, the reporting cadence for the sponsor and GP, and the platform’s treatment of side letters, co-investments, warehousing and SPV layers. The launch timetable and the effect of AIFMD II on policies, liquidity tools and disclosures remain part of that assessment where relevant.3
A third-party AIFM is the authorised manager responsible for the functions allocated to it throughout the fund’s life.
Conclusion
An authorised external AIFM is mandatory for a RAIF and may also provide the full-scope management and passport needed by other AIFs. The platform model must still correspond to the fund’s investor, distribution and governance requirements.
The AIFM’s remit determines how responsibilities and oversight are allocated among the SCSp or RAIF, GP, administrator, depositary and other providers.
Footnotes
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Law of 12 July 2013 on alternative investment fund managers, including the registration thresholds and authorised AIFM framework, available on Legilux. ↩ ↩2
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Law of 23 July 2016 on reserved alternative investment funds, including the requirement for an authorised external AIFM, available on Legilux. ↩ ↩2
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CSSF communication on Luxembourg implementation of Directive (EU) 2024/927, with AIFMD II changes applying from 16 April 2026, published by the CSSF. ↩
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Frequently Asked Questions
Does every Luxembourg SCSp need a third-party AIFM?
No. A plain SCSp that qualifies as an AIF can be managed by a registered sub-threshold AIFM if the AIFMD thresholds are not exceeded and no passport is required. A third-party authorised AIFM becomes relevant when the RAIF wrapper, an EU passport, institutional investor requirements or full-scope governance are needed.
Does a Luxembourg RAIF need an authorised AIFM?
Yes. A RAIF must be managed by an authorised external AIFM. For a first fund, appointing a third-party AIFM platform is usually faster and more realistic than building a proprietary authorised AIFM.
Can the sponsor still manage investments when a third-party AIFM is appointed?
The model depends on the platform and the regulatory setup. Portfolio management may be retained, delegated or supported by an adviser, but the authorised AIFM remains responsible for the AIFM functions and must control risk management, delegation and oversight.
What should a third-party AIFM mandate define?
The mandate should define the allocation of portfolio and risk management, delegation controls, valuation oversight, reporting cadence, escalation procedures and coordination with the depositary, administrator and GP.
When should the AIFM be selected in a fund launch?
The AIFM should be selected before the documents are final. The platform will review the strategy, investor base, risk profile, delegation model, service providers and liability provisions. Late selection frequently reopens the fund documents and delays launch.
