Two structures are driving private equity investment in law firms: the Management Services Organization and the Alternative Business Structure. If you are a PI firm owner evaluating outside capital, understanding the difference is critical because the structure you choose determines your ownership rights, your geographic flexibility, and your regulatory exposure.
How the MSO model works
The MSO model separates the law firm into two entities. The law firm remains one hundred percent lawyer-owned and controls all legal decisions. A separate MSO entity owns and operates the non-legal business infrastructure — marketing, finance, HR, IT, intake, facilities. The PE investor buys a majority stake in the MSO, not the law firm. The two entities are connected by a Management Services Agreement under which the MSO provides services in exchange for a flat management fee.
The critical advantage of the MSO is that it works in every U.S. jurisdiction. Because the MSO does not own the law firm and does not share in legal fees, it operates within existing ethics rules, not as an exception to them. The Texas Commission on Professional Ethics confirmed the model’s compliance in Opinion 706, issued in February 2025. There is no state where a properly structured MSO is prohibited.
How the ABS model works
The ABS model is fundamentally different. Under an ABS framework, non-lawyers can directly own and invest in the law firm itself. They can share in the firm’s profits and have a voice in management decisions. This is true non-lawyer ownership — the most direct path for PE to participate in legal services.
However, ABS is currently available in only a handful of jurisdictions. Arizona launched the first permanent ABS licensing program in 2021 and has approved over one hundred fifty entities. Utah operates a regulatory sandbox, though participation has narrowed to roughly eleven active entities. Washington D.C. allows limited non-lawyer involvement, restricted to individuals who perform professional services within the firm — passive investment is not permitted. Puerto Rico approved non-lawyer ownership capped at forty-nine percent, effective in 2026.
Why geography limits the ABS model
The geographic limitation is the ABS model’s biggest constraint. ABA Formal Opinion 91-360 provides that a non-lawyer-owned firm formed in one jurisdiction cannot maintain offices or lawyers in jurisdictions that prohibit non-lawyer ownership. Since most states still follow ABA Model Rule 5.4, an Arizona ABS cannot have lawyers based in California, Texas, New York, or the vast majority of other states.
California’s regulatory pushback on outside investment
California has moved in the opposite direction. In October 2025, Governor Newsom signed AB 931, which restricts California lawyers from sharing fees with out-of-state ABS attorneys. In March 2026, California amended AB 2305 to create a comprehensive framework regulating corporate investor involvement in litigation practices. While AB 2305 does not ban MSOs, it does establish statutory penalties for investor interference with legal judgment.
Why MSO is the preferred structure for most deals
For most PI firms and most PE investors, the MSO is the preferred structure because of its nationwide applicability. DLA Piper’s January 2026 analysis concluded that the MSO model may be preferable for most investors and most investments, specifically because it avoids the geographic constraints that limit ABS firms.
Financial readiness is the same regardless of structure
From a financial perspective, both models require the same level of preparation. Whether you pursue an MSO or an ABS, investors will expect GAAP-compliant financials, normalized EBITDA, a case inventory model, and documented KPIs. The financial infrastructure does not change based on the legal structure.
At CSuite Financial Partners, we help firms prepare for both paths. We build the financial foundation — you and your legal counsel decide the structure. Our role is to make sure the numbers are clean, the reporting is institutional-grade, and the firm can withstand diligence regardless of which model you pursue. If you are evaluating outside capital for your firm, start with the financials. The structure conversation comes second. Without investor-grade numbers, neither model gets off the ground.
If you are evaluating outside capital for your firm, start with the financials. The structure conversation comes second. Without investor-grade numbers, neither model gets off the ground.