BlackFin completes takeover of Arendt's investor-services arm after CSSF approval

BlackFin Capital Partners, the Paris-based private-equity firm that invests exclusively in European financial services, has completed its acquisition of a majority stake in Arendt Investor Services (AIS), the fund-services arm of Luxembourg's largest law firm, the companies said on Thursday 2 July.

The closing, first announced on 26 November 2025, followed approval by Luxembourg's financial regulator, the Commission de Surveillance du Secteur Financier (CSSF). Financial terms were not officially disclosed, but Investment Officer and Paperjam both reported that the transaction valued the business at close to $500 million (around €425 million).

The deal is a landmark for the Grand Duchy's financial centre: it brings private capital into a services group built over a decade and a half by Arendt & Medernach, the country's biggest law firm — and shows how far the wave of private-equity consolidation sweeping Luxembourg's fund-services industry now reaches.

What changed hands — and what did not

The law firm itself has not been sold. What BlackFin has acquired is Arendt Investor Services, the regulated services business founded within the Arendt group in 2009, together with AManco, the group's third-party alternative investment fund manager (AIFM), which was included in the transaction scope.

AIS employs around 320 professionals in Luxembourg and describes itself as a one-stop shop for alternative asset managers, asset servicers and family offices. Its offering spans:

fund administration and corporate services;

governance and operational anti-money-laundering and compliance services;

tax compliance;

third-party AIFM and depositary services.

The firm is a CSSF-supervised professional of the financial sector and, according to Paperjam, generates revenue of roughly €70 million a year after a run of double-digit growth. Paperjam also reported that BlackFin takes four of the six board seats, with Arendt keeping two.

Continuity was a central theme of the announcement. Arendt's partners retain what both sides call a "significant" minority stake, and Claude Niedner and Jean-Marc Ueberecken — two of the law firm's best-known partners — remain on the AIS board alongside BlackFin's representatives. The senior management team, led by chief executive Christian Heinen, stays in place, and AIS says it will keep operating with the same teams and service model, in close cooperation with the law firm.

"The Partners of Arendt continue to hold a significant minority stake in the company and are involved in strategic decisions," Niedner, chairman of AIS and co-chair of Arendt, said when the deal was unveiled in November.

A buyer with a Luxembourg playbook

Founded in 2009, BlackFin manages more than €4 billion in assets from offices in Paris, Brussels, Frankfurt, Amsterdam and London, and has made over 100 investments in European financial services. It has been active in Luxembourg for more than a decade, and AIS is not its first move on the country's fund-services ecosystem: in February 2025 it completed the acquisition of Lemanik Asset Management, a Luxembourg third-party management company overseeing some €30 billion in assets.

That pattern — buying regulated Luxembourg servicing platforms and scaling them across Europe — is precisely the rationale here. According to Paperjam, BlackFin intends to export AIS's Luxembourg model to other fund centres, with Paris, London, Dublin and Germany cited as possible destinations, while investing in technology, including artificial intelligence, and pursuing bolt-on acquisitions.

"We are delighted to complete this transaction and begin this new chapter alongside the AIS management team. Our ambition is to support the company's continued growth by investing in technology, expanding its international reach and pursuing selective acquisition opportunities, while preserving the client focus and entrepreneurial culture that have made AIS such a success," said Eric May, founding partner at BlackFin Capital Partners.

Heinen struck a similar note on completion day. "As we embark on this next chapter with BlackFin, we are building on these foundations," he said. "We will preserve what made AIS successful while adding new dimensions – greater technological capabilities, stronger commercial reach and a more international footprint."

What it signals for the financial centre

Luxembourg's fund-services industry — the administrators, management companies, depositaries and compliance specialists that keep the world's second-largest fund domicile running — has been consolidating rapidly as private-equity buyers hunt for recurring, regulated revenue streams. The AIS sale shows that even businesses grown inside the country's most prominent law firm are now part of that market: Paperjam reported that Arendt had fielded multiple unsolicited approaches before choosing a partner.

For Arendt, the structure offers capital for expansion that a law-firm partnership could not easily provide, while keeping a stake in the upside; Paperjam reported that BlackFin's fund typically invests over a five-to-seven-year horizon, with Arendt taking a longer-term view. For BlackFin, it adds a second Luxembourg platform in as many years and a base from which to consolidate a still-fragmented European servicing landscape.

The advisory line-up underlined the deal's significance for the local market: Arendt was advised by Deloitte on M&A and — in a rare case of Luxembourg's top firms on opposite sides of a deal touching one of them — by rival law firm Elvinger Hoss Prussen on legal matters, while BlackFin worked with Bain & Company, PwC, Clifford Chance and Gide.

AIS says the new phase begins immediately, with the same teams serving existing clients as the expansion plans take shape.