Private equity is acquiring management services organisations (MSOs) around US law firms as outside ownership rules evolve state by state
Private equity (PE) investors cannot directly own US law firms under Model Rule 5.4, the professional conduct rule that prohibits fee-sharing with non-lawyers across most US states. In 2026, however, institutional capital has found a structural workaround: buying management services organisations (MSOs), which are separate entities that handle the non-legal operating infrastructure of a law firm, including marketing, technology, billing, HR, and real estate. A July 2026 analysis from legal industry publication LawFuel identifies this as the year the profession 'worked out' that PE investment in MSO structures is not hypothetical but is actively reshaping the US legal market. The Texas Commission on Professional Ethics has confirmed that lawyers and outside investors may hold equity in an MSO, provided the MSO is not paid a portion of legal fee revenues and conflicts of interest are properly managed. The structure is particularly relevant given the parallel development of AI and operational technology within law firms: as those capabilities are carved out into separable business units, they become investable assets. For international law firms with US operations, and for UK-trained lawyers advising on cross-border legal services investments, the MSO structure raises choice-of-law questions (since the UK's regulatory framework for alternative business structures under the Legal Services Act 2007 takes a different approach to non-lawyer ownership), alongside due diligence questions about conflict management and data governance.
Why this matters
The MSO model is the most commercially significant structural change to the US legal market since the rise of PE-backed litigation funding, and it has direct implications for UK-advised cross-border transactions involving legal services businesses. As PE capital flows into MSO platforms at scale, City lawyers advising on those acquisitions need to understand both the US state-by-state professional ethics framework and, where a platform has UK operations, the alternative business structure regime. The point about AI is particularly sharp: the fastest-growing component of MSO value is the technology and data infrastructure underlying AI-powered legal delivery, which means these deals are increasingly also technology M&A transactions requiring IP and data protection due diligence alongside the professional regulation analysis.
On the Ground
On a cross-border legal services investment of this type, a trainee would be preparing a choice-of-law summary comparing the relevant US state professional conduct rules with the UK's Legal Services Act 2007 framework, coordinating local counsel instruction letters in the relevant US states, and assisting with sanctions screening and ownership structure verification for the acquiring PE fund.
Interview prep
Question you might get
“How does the legal framework governing non-lawyer ownership of law firms differ between the US and the UK, and what due diligence would you conduct before advising a private equity client on acquiring an interest in a US legal services platform?”
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