Luxembourg's private funds industry is set to benefit from greater flexibility, faster fund launches and clearer rules following the introduction of CSSF Circular 25/901, according to Stefan Staedter, partner at Arendt & Medernach. The circular consolidates decades of regulatory guidance into a single framework governing Part II funds, SIFs and SICARs.

By codifying years of individual administrative practices and derogations, the Commission de Surveillance du Secteur Financier (CSSF) has created a more transparent and “business-friendly” environment that reinforces Luxembourg’s position as a leading hub for private assets.

Regulatory consolidation and clarity

Historically, fund sponsors and legal advisers had to navigate multiple circulars dating back to the 1990s and early 2000s. Obtaining exemptions from certain limits often required direct discussions with the regulator.

The new circular replaces this fragmented approach with a consolidated “rule book.” "What we see today is the codification of years of administrative practice," said Staedter in an interview on 17 June 2026. This evolution in the CSSF's approach reflects a recognition that greater flexibility does not necessarily result in higher regulatory risk, provided the market remains diligent. For sponsors, this means a faster “time to market” and less need for extensive training to understand complex, overlapping rules.

Retailisation and the wealth management segment

Beyond regulatory simplification, the circular also addresses another major industry trend: the expansion of private market products into the wealth management segment.

One of the key drivers behind the circular is the growing "retailisation" of private markets, with semi-professional or well-informed investors increasingly seeking access to alternative investment strategies through wealth managers and other intermediaries.

With respect to investor protection, the regime makes a difference between the degrees of investor sophistication and allows for more flexibility when it is contemplated to market to sophisticated investors (i.e., well-informed investors).

Notably, Staedter observed that the wealth threshold for “sophisticated” and also for “professional” status in Europe remains significantly lower than in the US, where equivalent accredited investor requirements can be nearly double.

Enhanced investment flexibility

The circular introduces welcome flexibility regarding diversification and risk-spreading limits. The CSSF may grant further derogations on a case-by-case basis.

Part 2 funds marketed to unsophisticated retail investors are subject to diversification requirements that limit exposure to any single issuer, entity, fund, investment vehicle, or asset to a maximum of 25% of the assets. An exception applies to infrastructure investments, which may represent up to 50% of the fund’s total assets.

For funds restricted to well-informed or professional investors, the diversification limits are more flexible. Previously, SIFs could generally not exceed a 30% exposure to a single investment, and Part 2 funds were generally limited to 10% in liquid strategies and 20% in private assets, according to Staedter. The maximum exposure to a single issuer, entity, fund, investment vehicle, or asset increases to 50% of the assets. In addition, the permitted exposure in infrastructure investments amounts to 70% of the assets.

Staedter noted that clarification has been provided for funds investing in highly diversified target vehicles, such as US Business Development Companies (BDCs), which themselves invest across diversified portfolios of private companies. The CSSF now allows funds to rely on diversification achieved at the target fund level.

Operational provisions: Ramp-up and wind-down

New provisions regarding ramp-up and wind-down periods offer practical relief to managers. Sponsors now have more time—often up to five years—to build portfolios without feeling pressured to invest in the first available opportunities.

This is particularly beneficial for infrastructure and real estate strategies where finding the right targets is complex. Similarly, flexible wind-down rules allow managers to sell assets at the optimal economic moment rather than being forced into reinvestment. “It enables managers to better time the market from an economic perspective,” he said.

Transparency and disclosure expectations

While the circular eases certain limits, it increases disclosure requirements. Prospectuses for products marketed to unsophisticated investors must now explicitly indicate exposure to unregulated target funds, a shift from previously generic descriptions. Furthermore, specific risk warnings are mandated for funds with lifespans exceeding 10 years, and unsophisticated investors must be cautioned against over-concentration in a single private fund.

As private markets continue to expand into the wealth management segment, Circular 25/901 provides Luxembourg with a regulatory framework designed to accommodate both industry innovation and investor protection.