Brussels sets higher liquidity benchmarks for money-market funds, putting Luxembourg's vast sector on notice

The European Commission has set out, for the first time, recommended liquidity benchmarks for money-market funds that sit comfortably above the legal minimums, a recalibration that lands squarely on Luxembourg, one of the European Union's largest domiciles for the products.

In a report to the European Parliament and the Council on the adequacy of the Money Market Funds Regulation (MMFR), published on 11 May 2026, the Commission concluded that the framework, in application since 2018, continues to function well overall but said the market would benefit from additional guidance on how much liquidity managers should hold and how buffers should be deployed when conditions deteriorate.

Benchmarks above the statutory floor

The report came with a Commission Notice and accompanying FAQs (Brussels, 11.5.2026, C(2026) 2510 final) interpreting certain MMFR provisions. According to the Commission, the FAQs identify weekly-liquid-asset (WLA) resilience benchmark levels of 40% for stable net asset value funds (CNAV and LVNAV) and 20% for variable net asset value funds (VNAV).

Those figures sit well above the regulatory minimums baked into the MMFR, which require weekly liquid assets of 30% for CNAV and LVNAV funds and 15% for VNAV funds. In other words, the Commission is signalling that meeting the legal floor may no longer be enough to satisfy supervisory expectations around resilience.

The Commission's accompanying web article, "New measures to enhance the EU's money market funds framework," is dated 12 May 2026, a day after the underlying report and FAQs.

A framework that "works well"

The review is not a verdict of failure. The Commission found that money-market funds generally take a cautious approach by keeping liquidity reserves above the regulatory minimum, and that no EU-based fund had to apply redemption fees or gates, or suspend redemptions, during recent stress events.

Maria Luís Albuquerque, the Commissioner for Financial Services and the Savings and Investments Union, announced the guidance on 11 May 2026.

Today we are providing clearer guidance on how money market funds should maintain and use liquidity buffers, particularly in times of market stress.

The FAQs reference Article 28 of the MMF Regulation, which governs the stress-testing framework, and discuss situations in which weekly maturing assets fall below 30% — a threshold tied to the funds' tools for managing redemptions under pressure.

Why it matters for Luxembourg

Luxembourg's financial regulator, the Commission de Surveillance du Secteur Financier (CSSF), drew the Commission's report and FAQs to the attention of the domestic fund industry in a communication dated 15 May 2026. For a jurisdiction that hosts a large share of the EU's money-market funds, the practical effect is significant: managers now face supervisory expectations to hold liquidity buffers above the statutory floor and to calibrate them against redemption patterns and stress-test outcomes.

The scale of the wider market underlines the stakes. According to the Commission, the EU money-market fund market totalled roughly EUR 1.95 trillion in assets across 455 funds at the end of 2024 — a European-wide figure rather than a Luxembourg-only one, but one in which Luxembourg-domiciled vehicles loom large.

The move is distinct from the CSSF's recent anti-money-laundering work and its 2026 supervisory priorities. It is a discrete, dated regulatory development that puts concrete numbers on what "adequate" liquidity should look like, and it gives the Grand Duchy's fund managers a fresh benchmark to measure themselves against.