The announcement that Charlesbank Capital Partners is reportedly in advanced discussions over a transaction involving national law firm Wood Smith Henning & Berman (WSHB), valued at about $700 million, according to the Financial Times., shows that private equity interest is moving beyond the contingency fee and consumer market.
Neither Charlesbank nor WSHB has publicly announced a deal, and the reported deal remains subject to negotiation.
However, if completed, it could become one of the clearest tests yet of whether private equity can secure a meaningful economic foothold around a sizeable corporate-facing US law firm without crossing the profession’s restrictions on non-lawyer ownership and control.
Why WSHB is significant
WSHB is not a small specialist practice, having more than 500 lawyers across 43 offices, with lawyers practising in 35 US states and a presence in London.
Founded in 1997 by four attorneys the firm worked on the basis that it could improve outcomes for attorneys and clients alike with what they call an open-door, non-hierarchal culture has allowed our attorneys to thrive through teamwork, collaboration and working together for the benefit of our clients.
Its work dovers complex civil litigation and counselling for public and private companies, including insurance, construction, professional liability, employment and product-liability matters.
That national litigation platform is what makes the reported Charlesbank interest more consequential than another investment in legal-adjacent services. A deal at the reported valuation would put a major private-capital transaction alongside a law firm serving corporate and insurer clients across multiple regulated jurisdictions.
The MSO question
The reported structure is understood to involve a management services organisation, or MSO, rather than direct private-equity ownership of WSHB’s legal practice. (See our recent article about the 2026 ‘reckoning’ with the MSO deals.)
An MSO model separates the lawyer-owned professional practice from non-legal operating functions. The MSO may provide technology, finance, human resources, marketing, billing, facilities and other business services under a management agreement, while lawyers retain control over legal work and professional judgment.
ABA Model Rule 5.4 generally restricts fee-sharing with non-lawyers, non-lawyer ownership of law firms and arrangements that allow non-lawyers to direct a lawyer’s professional judgment. But an MSO structure is not a universal safe harbour: its legality depends on the relevant jurisdiction and the detailed terms governing ownership, fees, control, client information and conflicts.
The model is that investors own or fund the business platform; lawyers retain ownership and authority over the legal practice.
Charlesbank’s professional-services precedent
Charlesbank has already used a related model in another regulated profession. In 2024, it made a strategic investment in accounting and advisory business Aprio, which then adopted an alternative-practice structure.
Under that structure, Aprio LLP remained a separate licensed CPA entity providing attest services, while Aprio Advisory Group LLC provided business advisory, tax and other non-attest services.
Aprio said the investment was intended to support technology, talent, infrastructure and expansion although the transaction terms were not disclosed.
Charlesbank says it has since helped Aprio build its M&A capability, recruit leadership and invest in AI-powered services.
That history gives the reported WSHB discussions greater significance. It suggests a private-equity sponsor for WSHB would work along similar lines with a structural division between a regulated professional practice and a capital-backed operating platform.
A test for law-firm capital
Law firms face rising investment demands in AI, cybersecurity, data systems, lateral hiring, client-service technology and geographic growth all of which have challenged the traditional partnership model, which commonly distributes profits annually, can make large, long-term capital investment difficult.
Private equity offers capital and operating expertise. Rule 5.4 and state ethics rules impose the guardrails.
A completed WSHB transaction would not amount to private equity buying a US law firm in the conventional sense., but it could provide an important market test of the MSO model in a larger, corporate-facing litigation practice.
The implications would extend beyond ownership. Firms and regulators would be watching the treatment of professional independence, investor-related conflicts, confidentiality, data governance, management fees and who has practical control over the firm’s strategy and operations.
Arizona’s ABS regime and D.C.’s more limited rules on non-lawyer ownership show that the regulatory landscape is already uneven. In most US jurisdictions direct outside ownership remains heavily constrained, making MSO structures the principal route being explored for outside investment.
