CSSF Sharpens Its 2026 Watch on Luxembourg Funds: Liquidity, Valuation, Fees and Cyber

Luxembourg's financial regulator has set out a tougher supervisory agenda for the country's vast investment fund sector in 2026, signalling closer scrutiny across governance, liquidity, asset valuation, costs and fees, cyber resilience and sustainable-finance claims. The document, "The CSSF's 2026 priorities for supervising the investment fund sector," was published by the Commission de Surveillance du Secteur Financier (CSSF) on 31 March 2026 and picked up by Luxembourg's two main business outlets, Delano and Paperjam, at the end of May.

The tightening matters because Luxembourg is Europe's largest fund domicile and the world's second-largest after the United States by assets under management. According to the regulator, the sharpened focus is a direct response to persistent market volatility and a tense geopolitical backdrop.

Eight priority areas

The CSSF frames its work around eight priority areas: governance and operational risks; ICT and cyber risks; liquidity and credit risks; contagion risks and interconnectedness; asset valuation risk; sustainable finance; costs and fees; and money-laundering, terrorist-financing and proliferation-financing risks. The breadth signals a supervisor moving beyond any single theme toward a system-wide tightening.

On liquidity, the regulator says it will conduct further thematic, sample-based reviews of the liquidity risk management processes used by investment fund managers (IFMs), with particular attention to managers of open-ended private-asset funds. Those reviews will also extend to credit risk management for funds carrying material private-debt exposure. The CSSF adds that supervisory stress tests will be further developed, "notably due to the geopolitical environment and rising market risks," to better monitor margin and collateral calls tied to financial derivative instruments and repurchase agreements, or repos.

Valuation and the cost of investing

Valuation sits high on the list. The regulator says it will focus on on-site controls of how fund managers organise their valuation functions, complemented by thematic, sample-based reviews of open-ended private-asset funds and continuation funds.

Valuation remains a key supervisory priority, with notably a focus on on-site controls pertaining to the valuation organisation.

On costs and fees, the CSSF says it will verify that fund managers act in the best interest of investors and, in particular, prevent undue costs being charged to funds and the people who invest in them. The regulator will also continue specific risk monitoring of alternative investment funds (AIFs) and UCITS that carry higher levels of leverage.

DORA moves to the centre

One of the clearest signals is the regulator's emphasis on digital resilience. Embedding the EU's Digital Operational Resilience Act (DORA) into the supervisory work programmes of fund managers, alongside risk-based monitoring of how they implement it, is named as a key 2026 priority.

Incorporating Dora requirements into the supervisory work programmes of investment fund managers is a key priority for 2026.

The 2026 actions also draw on the European Securities and Markets Authority's Union Strategic Supervisory Priorities and on IOSCO's 2026 Work Program, anchoring the Luxembourg agenda in wider European and international supervisory thinking.

A separate push on sustainable finance

In a related communication published on 2 March 2026, the CSSF set out its sustainable-finance priorities. The regulator says it will continue to monitor fund managers' compliance with the Sustainable Finance Disclosure Regulation (SFDR), its regulatory technical standards and the EU Taxonomy Regulation, with the stated aim of increasing transparency for investors and guarding against greenwashing.

Taken together, the priorities mark a current and live development for a sector that underpins much of Luxembourg's economy, and they put fund managers on notice that 2026 will bring more on-site controls, more thematic reviews and a firmer line on costs, valuation and digital risk.