Restricted Transfer Agreements in MSO/PC Structures: What They Do, Why California Is Different, and Why the AG Just Sent a Warning Shot
If you operate an MSO, or you are about to launch one, the restricted transfer agreement is one of the documents you will sign without fully understanding what it does or why it exists. Most founders treat it as boilerplate. It is not. It is the document that determines whether your structure actually holds together when the physician-owner of your PC leaves, dies, gets divorced, loses their license, or simply changes their mind.
It is also the document that California is currently using to decide whether MSO/PC arrangements across the state are legal at all.
This post walks through what these agreements are, what provisions they typically contain in non-California jurisdictions, how California’s rules differ, and why the Attorney General’s recent amicus brief in Art Center Holdings is a warning shot that every MSO operator in California needs to take seriously.
What Is a Restricted Transfer Agreement?
A restricted transfer agreement, sometimes called a stock transfer restriction agreement, continuity agreement, or succession agreement, is a contract that governs what happens to the equity in a physician-owned professional c
In the MSO/PC model, a single licensed physician (or a small group of physicians) owns 100% of the PC. The PC is the entity that actually delivers clinical care, employs or contracts with providers, and bills for medical services. The MSO sits alongside the PC and provides everything that is not the practice of medicine: technology, billing infrastructure, administrative support, marketing, HR, real estate, and so on.
The fundamental tension in this structure is that the MSO and its investors are the ones putting capital at risk, but the physician is the one who legally has to own the medical entity. If that physician walks away, dies, gets sick, or simply stops cooperating, the entire business is in jeopardy. The MSO has no clinical license, cannot own the PC, and cannot legally step in.
The restricted transfer agreement is the contract that tries to solve this problem. It sets the rules for when and how the physician’s ownership in the PC can change hands.
What These Agreements Typically Include (Outside California)
In most states, an MSO-friendly restricted transfer agreement will include some combination of the following provisions. None of these are inherently bad. They have been standard in the industry for decades and have been used to legitimately protect investors, ensure continuity for patients, and create stable structures for scaling healthcare businesses.
Triggering events. The agreement defines specific events that trigger a mandatory transfer of the physician’s shares. Common triggers include the physician’s death, disability, loss of medical license, bankruptcy, divorce (to prevent shares from being awarded to a non-physician spouse), termination of the MSA, breach of the MSA, or voluntary departure.
Successor designation. The agreement designates who receives the shares when a triggering event occurs. In aggressive structures, this is a specific person, often pre-selected by the MSO and pre-approved to step in as the new physician-owner. In more moderate structures, it is a class of eligible successors (any licensed physician meeting certain criteria) with the MSO playing a role in identifying candidates.
MSO approval over share transfers. The agreement gives the MSO consent rights over any voluntary share transfer by the physician. The physician cannot sell, gift, or transfer their shares without the MSO’s written approval.
Call options and put options. The MSO may have a call option to require the physician to sell shares back at a predetermined price under specified conditions. The physician may have a put option to require the MSO (or a designated buyer) to purchase the shares.
Pricing formulas. Most agreements specify a pre-set price or formula for share transfers, often nominal (one dollar, or book value) because the PC is structured so that the economic value sits in the MSO, not the PC.
Termination consequences. Termination of the MSA triggers an automatic transfer of shares, usually to a successor physician designated or approved by the MSO. This is the provision that keeps the PC under “friendly” ownership even if the original physician relationship ends badly.
In most states, this structure is enforceable and routine. Investor counsel, healthcare counsel, and corporate counsel have been signing off on versions of this document for thirty years. It is the operating assumption of the entire MSO/PC industry.
California Is Different
California has the strictest corporate practice of medicine doctrine in the country. The doctrine prohibits any non-physician entity from owning, controlling, or influencing the practice of medicine. California enforces this through the Medical Board, the Attorney General, and, increasingly, the courts.
California’s CPOM doctrine has always made some of the above provisions risky. But until recently, the industry-standard approach was to draft those provisions carefully, attach a few protective qualifiers, and rely on the fact that the state was not actively enforcing against well-structured MSOs.
Two things changed in the last twelve months.
First, the legislature acted. SB 351, effective January 1, 2026, codified CPOM into statute and specifically named private equity, hedge funds, and investor groups as targets. The statute prohibits non-physician control over patient medical records, physician hiring, and the PC’s contractual relationships. AB 1415, also effective January 1, 2026, requires private equity, hedge funds, MSOs, and certain newly formed healthcare entities to provide 90 days’ advance notice to the Office of Health Care Affordability before closing material change transactions.
Second, the Attorney General is now litigating. This is the more significant development, and it is where the recent amicus brief comes in.
The Art Center Holdings Case and the AG’s Amicus Brief
Art Center Holdings, Inc. v. WCE CA Art, LLC is currently pending before the California Court of Appeal. The trial court ruled that a private-equity-backed MSO engaged in the unlicensed practice of medicine because its continuity agreement gave the MSO broad discretion to transfer control of the PC.
The defendants appealed. The California Attorney General, under Rob Bonta, filed an amicus brief on March 25, 2026, urging the appellate court to adopt the strictest possible reading of CPOM. The brief’s core argument is this: any contractual mechanism that allows an MSO to effectuate a change in physician ownership is sufficient to raise CPOM concerns. It does not matter whether the MSO actually exercises the control. It does not matter whether clinical decisions are affected. The existence of the lever is the problem.
The California Medical Association filed a counter-brief on April 15, 2026, urging a more nuanced facts-and-circumstances test. The CMA’s position is that not every continuity provision should be treated as a per se CPOM violation, and that the court should look at whether an agreement, in practice, vests clinical control in a non-physician entity.
Why the AG Brief Is a Warning, Not Just a Legal Argument
A few things make this brief different from the usual legal back-and-forth.
The AG did not have to file it. Amicus briefs are voluntary, and an AG filing one signals that the office sees the underlying issue as a state enforcement priority. This is not a private dispute the AG is commenting on from the sidelines. This is the AG telling the court, and by extension every MSO in California, where the office stands.
The position is categorical, not nuanced. The brief does not say “look at the facts.” It does not say “balance the equities.” It says any meaningful MSO influence over physician ownership transitions is illegal. That is the maximum-strictness reading of CPOM, and it is the position the AG has chosen to plant a flag on.
The timing aligns with the new statutes. SB 351 and AB 1415 went into effect just three months before the AG filed the brief. The legislature acted, then the AG showed up to argue for the strictest possible interpretation. That is not a coincidence. That is a coordinated message.
If you are an MSO operator, the message is: California is not going to wait for the appellate court to issue a ruling before treating these provisions as problematic. The AG has already signaled that the office views them as evidence of unlicensed practice of medicine. That view will inform investigations, enforcement decisions, and any future material change transaction filings under AB 1415.
The Three Provisions That Cannot Survive in a Post-Bonta California Structure
Based on the AG’s brief, three categories of provisions are now untenable in California MSO/PC contracts, regardless of how they are drafted around:
Options to swap the physician-owner. Any provision that allows the MSO to trigger a replacement of the physician-owner, whether framed as a “successor designation,” a “physician replacement option,” or a “call right tied to performance,” is in the AG’s crosshairs. The AG’s theory is that this is exactly the indirect control over the practice of medicine that CPOM prohibits.
MSO approval rights over share transfers. Any contractual requirement that the physician-owner obtain the MSO’s consent before transferring shares is now treated as evidence that the MSO controls who owns the PC. Under the AG’s reading, that control is itself the CPOM violation.
Termination triggering equity transfer. Provisions where termination of the MSA, breach by the physician, or similar events automatically result in equity moving to an MSO-designated successor are the most aggressive form of the controls the AG is targeting. These provisions tie the PC’s ownership to the MSO’s contractual rights, which is the structural pattern the AG views as practicing medicine without a license.
If your California MSA, restricted transfer agreement, PC operating agreement, or any related document contains any of these three, you have an exposure that needs to be addressed now, before there is a regulatory inquiry, a deal closing, or a physician dispute that forces the issue.
What a Compliant California Structure Looks Like
A defensible post-Bonta California structure operates on a different set of principles.
The MSO is not a party to share transfer agreements. Share transfers happen between the physician-owner (or their estate) and a successor physician. The MSO does not sign, does not consent, does not approve.
Triggering events for share transfers are physician-side only. Death, disability, voluntary departure, loss of license, retirement. Nothing the MSO can cause or accelerate.
There is no minority repurchase of majority shares. A minority physician owner cannot buy out the majority. This closes the workaround where an MSO would seed a minority owner who could later take control.
The MSA is decoupled from equity. Termination of the MSA does not trigger an ownership change. Ownership changes do not automatically affect the MSA. They are separate contractual tracks.
There is a wind-down path. If no successor is identified and no physician steps in, the PC winds down. That is the contingency, and it is honest about the limits of MSO control. It is also the right contingency, because the alternative is a structure that pretends MSO control does not exist while exercising it.
Why Building This Right Matters
If you build a California MSO/PC structure with the old provisions intact, you create a chain of failure that runs through everything else you have built.
A successful CPOM enforcement action against your structure can void the MSA. It can result in disgorgement of management fees. It can trigger Medical Board action against the physician-owner. It can void your PC’s contracts with payers, vendors, and providers. It can render your investor agreements unenforceable. It can expose you to claims from patients, employees, and franchisees.
The entity formation, the contract suite, the credentialing infrastructure, the technology platform, the operational SOPs, all of it depends on the structure being legally sound. A defective restricted transfer agreement is not a small problem you fix later. It is the load-bearing wall.
The operators I work with in California are doing two things right now. First, they are amending existing agreements to remove the three high-risk categories of provisions. Second, they are documenting the operational reality of their structures to show that the MSO actually behaves like a service organization and not like the owner of a medical practice. Both pieces of work are necessary. Neither is optional.
What to Do This Week
Pull your California MSA, restricted transfer agreement, PC operating agreement, and any related side letters or amendments. Map every provision against the three high-risk categories. Identify what has to be amended, what has to be deleted, and what can stay.
Have the conversation with your physician-owner before you redline anything. The amendments are going to give the physician more autonomy, not less, and the conversation goes much better when you frame it that way.
Do a parallel review of your operational practices. The AG brief makes clear that documentation matters but operational substance matters more. If your contracts say one thing and your day-to-day practice says another, the practice is what will get used against you.
If you are still in formation, build the post-Bonta structure from scratch. The cost of doing it right the first time is a small fraction of the cost of restructuring under enforcement pressure.
California is playing hard ball. The AG has sent the warning. The operators who take it seriously now will be the ones still standing when the appellate court rules and the next wave of enforcement begins.
