MSO structures, private equity, and ownership of ABA practices

The two-question test that decides whether you need an MSO

Across every state, the ownership question resolves to two variables. Get both, and you can predict the structure before you read a word of the state-specific statute.

One cross-cutting nuance ties these together and trips people up: a state can be strict on the corporate practice of medicine yet permissive for ABA, because behavior analysis is licensed by a different agency or not licensed at all. Colorado and Texas are the clearest examples. Both strictly police physician ownership, but neither doctrine reaches a pure, behavior-analyst-delivered practice. The lesson is that "strict state" is the wrong question. The right question is whether the strictness reaches your profession and your clinical model.

The spectrum: from permissive to an ownership mandate

Plotted on a single line, the 17 states sort into two broad groups, with the strict end now anchored by a true ownership mandate.

Why ownership rules exist at all

The rules in this area descend from the corporate-practice-of-medicine doctrine, a principle developed to keep clinical judgment in the hands of licensed clinicians rather than business owners whose primary duty runs to investors. The concern is that if a corporation owns the practice and employs the clinician, the corporation's financial interests could override the clinician's professional judgment about what a patient needs. States express this idea in different ways, through case law, attorney-general opinions, professional-entity statutes that limit ownership to licensees, and, increasingly, statutes written directly for behavior analysis. The common thread is the same: protect the clinical relationship from the profit motive. Whatever your structure, the clinician must keep genuine authority over clinical decisions, and that principle survives even in the most permissive states.

What a management services organization actually is

An MSO is a separate company that provides the non-clinical side of a practice to a clinical entity it does not own. The clinical entity employs the licensed clinicians and holds the license. The MSO employs everyone else and runs the business. A management services agreement ties them together, and the clinical entity pays the MSO a fee. In strict states the two must be separate because the clinical entity has to stay licensee-owned, so the enterprise value, and any non-licensee equity, accumulates in the MSO. This is the friendly-PC and MSO model that backs most multistate and private-equity-backed ABA platforms.

The 17-state comparison at a glance

Each state name links to its full page, with the verdict, a nine-criteria scorecard, verified statute citations, setup steps, and an FAQ. The summary below is a starting point, not a substitute for the state page or for counsel.

The pattern worth noticing: the permissive states get there by different routes, some never adopted the doctrine, some abolished it, some never licensed behavior analysts, and some license ABA through an agency that the medical doctrine does not touch. The strict states are more uniform, tying ownership of the professional entity to licensure. And one state, Illinois, has moved past doctrine entirely and legislated the answer.

Three developments to watch in 2026

This area is moving quickly. Three changes are reshaping the analysis and deserve attention before any structuring decision.

Private equity and outside investment in ABA

Outside investment in ABA almost always uses the MSO model, for a simple reason: in the states that require licensee ownership, an investor cannot hold equity in the clinical entity, so the investable, sellable asset is the management company. A sponsor capitalizes the MSO, the MSO contracts with one or more licensee-owned clinical entities, and enterprise value builds on the management side. The model is well established, but it is also where the recent legal changes bite hardest. Oregon's 2025 law directly targets aggressive MSO control of medical entities; Illinois's Section 150 reaches every equity holder, so the MSO cannot hold equity in the ABA business itself; and the transaction-notice laws can require a regulator to be told before a deal closes. A structure that was routine three years ago may need redesign in these states today, which is why current, state-specific counsel is now part of the cost of doing a deal.

Fee-splitting, anti-kickback, and self-referral

Ownership is only one constraint on the relationship between a practice and a management company. The fee itself is regulated. Several states restrict fee-splitting, the sharing of professional fees with non-licensees, and treat a management fee that functions as a disguised split of professional income as a violation. Fixed and cost-plus fees set to the fair market value of real services are the safest and cleanest to defend because they trace to documented work; percentage-of-revenue fees are riskier and, in the stricter states, can draw scrutiny. On top of the state rules, when a practice serves Medicaid or other federal-program clients, the federal anti-kickback statute applies to remuneration tied to referrals or to generating federal-program business (42 U.S.C. § 1320a-7b(b)). Fee design should be reviewed alongside the ownership structure, not after it.

How ownership disclosure works at the payor level

Whatever a structure looks like on paper, payors see through it at enrollment. Medicaid programs require disclosure of a provider's ownership and control interests, including the management company and the people behind it, at enrollment and at revalidation (42 C.F.R. Part 455). Commercial payors impose their own credentialing and disclosure requirements. The practical point is that an MSO does not hide ownership from regulators or payors; it allocates it lawfully. The disclosure obligations are covered in more depth on the Medicaid and insurance mandates page.

How regulators and diligence counsel evaluate MSO arrangements

If a structure is ever questioned, by a licensing board, a payor, or a buyer's diligence team, substance controls over form. The recurring questions are the same across states: are the owners of the clinical entity the licensees the law requires; does the management company contract with the clinical entity rather than control it; do the clinicians retain genuine authority over clinical decisions, hiring, and supervision; and does the management fee reflect the fair value of real services rather than a transfer of the practice's profit. A structure that answers those questions cleanly tends to hold up. One that uses the right entities on paper but leaves a non-licensee in effective control of clinical decisions is the kind of arrangement the doctrine was built to catch.

How ownership connects to the rest of the compliance guide

Ownership is one layer of a larger compliance picture, and the other layers interact with it. Who must be licensed to deliver ABA, the fact that drives whether ownership can be restricted at all, is the subject of licensing and credentialing, and whether the state compels a professional entity in the first place is the gateway question of the entity decision. The menu of forms, PLLC, PC, service corporation, or standard LLC, and which states offer which, lives in entity structures for ABA practices. The ownership stack you build is then disclosed at payor enrollment and revalidation in Medicaid and insurance mandates, a change of ownership triggers the facility and records rules in facility licensure and HIPAA, and multistate operations, transaction-notice laws, and private-equity structures are the territory of practice expansion and sale.

Common questions about ownership in ABA