Outside money has arrived at the door of the legal profession. Illinois is in the middle of deciding whether to let it in.
On February 6, 2026, identical bills were introduced in both chambers of the Illinois General Assembly. Senate Bill 3812, sponsored by Senator Michael Hastings, and House Bill 5487, sponsored by Representative Jennifer Gong-Gershowitz, would amend the Illinois Attorney Act to prohibit private equity groups, hedge funds, and entities they own or control — including management services organizations — from doing certain things in connection with Illinois law firms. On March 25, 2026, the House Judiciary Committee approved HB5487 and sent it to the floor. As of this writing it is the most aggressive state-level legislative response to the entry of capital into the legal profession that any state has produced.
The bills do not appear in a vacuum. They follow California's AB 93, signed in October 2025, which became the first state law to specifically restrict alternative business structures and lawyer fee-sharing with non-lawyer-owned firms. They precede similar bills under consideration in Washington, Indiana, and Minnesota. They follow the Texas Commission on Professional Ethics's February 2025 Opinion 706, which became the first significant state ethics opinion to address law firm management services organizations. They follow McDermott Will & Schulte's November 2025 public disclosure that it was in preliminary talks to sell a stake in the firm — the first BigLaw firm to publicly entertain that question. They follow an Arizona-based law firm's $125 million MSO transaction announced earlier this month.
Capital has arrived at the door of the legal profession. The question Illinois is in the middle of answering is whether to let it in, on what terms, and with what guardrails. The answer the state gives in the next twelve months will shape the structural options available to thousands of Illinois practitioners — including, importantly, the aging solo and small-firm practitioners whose succession problem Part II of this series described.
This installment is about the structures that have emerged, the ethics architecture that governs them, the Illinois bills' specific content, and the underlying analytical question of whether outside capital is good news for the practitioners it is meant to serve. There are honest answers in both directions. The series's overall thesis — that the consolidation forecast underestimates the small firm — does not require treating MSOs as villains, and I will not.
◆ ◆ ◆
What an MSO actually is
The management services organization model is borrowed from healthcare, where it is mature. The structure exists because all fifty states either prohibit nonlawyer ownership of law firms (Rule 5.4 in Illinois and most states) or, more recently, regulate it tightly through alternative business structure regimes (Arizona, Utah, the District of Columbia, Puerto Rico). Direct outside investment in a law firm is therefore generally not available. The MSO is the structural workaround.
Mechanically, the model splits a law firm's existing operation into two separate legal entities. The first — call it the Law Firm — continues to practice law. It is owned entirely by lawyers, in compliance with Rule 5.4. It has its clients, its files, its lawyers, its trust accounts, and the professional liability that comes with all of those. The second — call it the Service Company, or ServiceCo, or simply the MSO — does not practice law. It owns the office leases, the technology, the marketing assets, the back-office staff, the payroll system, the IT infrastructure, the financial systems, and whatever other operational pieces the Law Firm needs to function. The MSO sells those services back to the Law Firm under a master services agreement at a contractually defined fee.
Because the MSO does not practice law, it is not subject to Rule 5.4. Outside investors — including private equity sponsors, hedge funds, family offices, and strategic acquirers — can take ownership stakes in the MSO. The Law Firm remains lawyer-owned. The structural separation is preserved. The capital flows to the operational stack, not to the practice of law.
The structure has been legally available in some form since at least 2006, when the first known law-firm MSO transaction closed quietly. For most of the last two decades, almost nothing was written about the model. The acceleration of interest is recent and is attributable to several converging developments: Arizona's 2021 elimination of Rule 5.4 (which expanded the imagination of investors and lawyers about what was possible, even though Arizona's structure is something different from an MSO); the operational pressure on mid-size firms to invest in technology, especially generative AI; the emergence of repeat sponsors with track records in similar adjacent professional services; and the publication of meaningful ethics guidance, principally Texas Opinion 706.
Why now
Three things explain the timing of the recent acceleration.
First, the technology demand. The kind of operational infrastructure that mid-size and large firms now need — enterprise document management, secure AI deployment, sophisticated cybersecurity, integrated billing and matter-management systems — costs significantly more than it did a decade ago, and the cost trajectory is upward. PitchBook data show that capital flowing into legal technology rose from approximately $900 million in 2023 to over $2.6 billion through the first three quarters of 2025. The platforms that capital is funding are the platforms law firms increasingly need. Most firms cannot finance institutional-scale technology investment from current operations without either materially compressing partner distributions or finding outside capital. The MSO is the structure that lets them choose the second option.
Second, the succession demand. Part II of this series described the demographic cliff facing Illinois solo and small-firm practitioners. The same pattern, in less acute form, is visible in mid-size firms — aging equity partners with significant book value who cannot find traditional successors. The MSO model offers a partial liquidity event that is not otherwise available. A senior partner can sell her interest in the operational entity, retain her interest in the legal entity, continue practicing under reduced day-to-day operational responsibility, and convert what was an illiquid partnership stake into something that resembles a transferable asset. The early Rimon transaction with Alpine Investors, which created NovaLaw (now operating as Briefly under AlpineX ownership), was structured around precisely this logic and is described by the firm's founders as a legacy and succession solution as much as a growth investment.
Third, the supply of capital. Private equity sponsors who have run successful playbooks in healthcare MSOs, accounting MSOs, dental groups, veterinary practices, and other professionalized service businesses are looking for the next sector. Legal services has been visible to them for years; what was missing was a regulatory pathway and a ethics architecture investors could underwrite. Texas Opinion 706, by addressing the model directly and by implicitly approving its permissibility when properly structured, gave sponsors something closer to a yes — at least a yes within the ethics framework one important state had articulated. Sidley reports 136 alternative business structure entities approved in Arizona as of April 2025, with 59 percent of those licensed in 2024 wholly owned by nonlawyers. The trajectory is clear.
Capital has arrived at the door of the legal profession. The question Illinois is in the middle of answering is whether to let it in, on what terms, and with what guardrails.
What Texas Opinion 706 actually said
Texas Opinion 706 deserves precise treatment, because most of the secondary commentary about it is wrong in small but important ways. The opinion was issued by the Professional Ethics Committee for the State Bar of Texas in February 2025. It is not binding outside Texas. It is binding only as persuasive authority anywhere. It addresses two questions and answers them with significant specificity.
The first question is whether a lawyer or law firm may pay an MSO a fee that is calculated as a percentage of the firm's revenues. The Committee's answer is no. Even if the MSO does not practice law, even if the MSO genuinely provides legitimate services, payment structured as a percentage of legal revenues is fee-splitting with a nonlawyer in violation of Texas Rule 5.04(a) (the Texas analog to Illinois Rule 5.4). The MSO must be paid on a flat-fee, cost-plus, or fair-market-value basis — something whose calculation does not vary with the legal fees the firm collects. This is the single most important practical guardrail in the opinion. It is also the guardrail that capital sponsors find most operationally inconvenient, because revenue-share structures are the simplest way to align an investor's return with the underlying business's growth.
The second question is whether a lawyer may hold an equity interest in an MSO that provides services to the lawyer's own firm. The Committee's answer is yes, conditionally. A lawyer may invest in an MSO that provides law-related services so long as the MSO does not practice law. But where the lawyer refers his own clients to such an MSO, the referral becomes a business transaction with the client, triggering full disclosure obligations under the Texas analog to Rule 1.8 — written disclosure of the terms, written disclosure of the lawyer's role, a written recommendation that the client seek independent counsel, and written informed consent. These are not pro forma boxes to check. They are the substantive guardrails the Committee imposed in exchange for the conditional yes.
The opinion's most consequential feature is what it does not say. It does not say MSOs are presumptively suspect. It does not say MSOs require special supervision beyond the ethics rules already in place. It does not say outside capital is incompatible with professional independence. The Committee's posture is structurally permissive: properly structured MSOs are permissible, and the existing rules of professional conduct provide the necessary framework. This is the posture that sponsors and the law firms that work with them have been waiting for.
The Holland & Knight commentaries that have done most of the substantive work explaining 706 to the bar describe it as an opinion that puts in writing what experienced practitioners had concluded informally for years. North Carolina reached substantively similar conclusions in 2001, with much less analysis. The 2026 ABA Law Practice Magazine treatment frames the model as one that, properly executed, fits comfortably within existing professional conduct rules. The legal industry is not without dissenting voices, but the substantive ethics literature has converged on a fairly clear position.
What the Illinois bills actually do
Senate Bill 3812 and House Bill 5487 — identical bills, sponsored respectively by Senator Hastings and Representative Gong-Gershowitz — amend the Illinois Attorney Act and operate on two distinct tracks.
The first track regulates MSOs. The bills prohibit any "private equity group, hedge fund, or any entity owned, operated, or controlled by a private equity group or hedge fund, including management services organizations, that is involved with a law firm or an attorney's practice" from doing three things: (1) interfering with the professional judgment of attorneys in representing clients; (2) exercising control over (or being delegated power over) client records, hiring and firing of attorneys or allied legal staff, or competency parameters for attorneys or staff; and (3) charging any fee "directly or indirectly based on the fees, revenues, or profits of the attorney or law firm."
Items (1) and (2) largely codify the substantive requirements of Rule 5.4 and the underlying professional independence principles. Item (3) is doing more work. The phrase "directly or indirectly based on" is broad. It plainly captures revenue-share structures of the kind Texas Opinion 706 already prohibits. It also potentially captures structures that no one has previously thought of as fee-splitting — including, as Holland & Knight's Trisha Rich and others have observed in commentary on the bill, conventional vendor arrangements where a service provider's compensation reflects, even partly, the volume or scale of the firm using the service. Document management platforms charge per matter. E-discovery vendors charge by document volume. Court reporters charge per deposition. Title companies share examination fees. Litigation finance companies receive returns indexed to case outcomes. Each of these arrangements, on the broadest reading of Section 13(b)(3), could be brought within the prohibition. Whether the legislature intends that result is not obvious from the bill text.
The second track addresses out-of-state alternative business structures. Section 13(d) prohibits an Illinois lawyer from sharing legal fees, directly or indirectly, with an out-of-state ABS unless: the Illinois lawyer is also licensed in the ABS's home state; the shared fees relate to legal services performed in that state; and the other state's law controls the representation under Rule 8.5. This is the ABS-track provision. It mirrors California's AB 93 and operates as a federalism guardrail — preventing Arizona-licensed ABS firms from receiving revenue from legal work performed in Illinois through referral or fee-sharing arrangements.
The penalties are not trivial. A violation exposes the offending attorney to disciplinary action, statutory damages of $10,000 or treble damages, attorneys' fees, and injunctive relief. The bill creates a private right of action.
The separation-of-powers question
There is a real constitutional question lurking under the bills, and it deserves attention because it will likely shape what happens to them.
The Illinois Supreme Court has long held that regulation of the legal profession is the Court's exclusive province. The Court promulgates the Illinois Rules of Professional Conduct. The Court controls attorney admission, discipline, and continuing legal education. The Attorney Registration and Disciplinary Commission is an arm of the Court. When the General Assembly enters this space, it does so under separation-of-powers limits the Court has enforced in past cases.
HB5487 and SB3812 attempt to regulate the business arrangements through which lawyers practice — the contractual relationships between law firms and the entities that provide back-office services to them. There is a respectable argument that this is properly understood as economic regulation of vendors rather than regulation of the legal profession itself, and that the General Assembly therefore has full authority. There is also a respectable argument that prohibiting an Illinois lawyer from entering into a particular type of business arrangement, on pain of disciplinary sanction, is a regulation of the legal profession that the Court alone may impose. If the bills become law, this question will be litigated.
The Court's own posture on these questions has not been signaled. The April 2026 rule package described in Part II addresses geographic distribution of lawyers, not capital structure of firms. The ARDC's October 2025 AI guide engages questions of technology and confidentiality but does not address ownership structures. The Illinois State Bar Association's most directly relevant pronouncement on MSOs remains its 1997 opinion, which addressed a narrow question about unauthorized practice of law in a structure that bears little resemblance to modern MSO arrangements. There is space, in other words, for the Court to act on these questions, and there is a question — which the bills' constitutional vulnerability raises — about whether the legislature is the appropriate body to act first.
What the bills get right, and where they overreach
There is something the bills get importantly right. The professional independence concerns are real. The capital playbook in adjacent professional services has not been uniformly benign, and the failure modes are predictable. In healthcare, where the MSO model has been mature for decades, there is documented pressure on physicians to prioritize procedure volume over clinical judgment, downward pressure on staff compensation, cost-cutting in non-revenue-generating support functions, and gradual erosion of professional autonomy as the operational entity exerts more control through compensation structures, technology decisions, and metrics. Some of this is just business. Some of it is real interference with professional judgment. The boundary is harder to police than the ethics opinions suggest.
The UK experience, which is the most extensive natural experiment with private equity in legal services, shows similar patterns. After alternative business structures became permissible in 2007, PE investment in UK firms grew steadily; over the last five years approximately £1.2 billion has flowed into UK law firms, including £534 million in 2024 alone. The growth has been concentrated in certain practice areas — personal injury, conveyancing, commoditizable consumer-facing work — and conspicuously absent from areas that depend on professional judgment in ways resistant to operational systematization. PE-backed roll-ups have created regional platforms, achieved economies of scale, and in some cases delivered improved client service. They have also created pressure on professional independence, occasionally produced spectacular failures, and not, on balance, expanded legal services to underserved populations.
The bills' Section 13(b)(1) and (2) prohibitions — on interfering with professional judgment, on controlling client records, on hiring and firing decisions, on competency parameters — are doing legitimate work. They codify, with statutory teeth, the same principles that Rule 5.4 already requires. The codification adds nothing in theory but considerable practical force, particularly because it creates a private right of action with treble damages.
Section 13(b)(3) is where the overreach lives. Texas Opinion 706 already prohibits revenue-share fee structures. So does Rule 5.4 properly applied. The Illinois bills' "directly or indirectly based on" language goes beyond what either Texas's framework or Illinois's existing rule requires. It threatens to capture conventional vendor relationships and may, as the Holland & Knight commentary observes, effectively prohibit litigation finance in the state. Whether that scope is intended is unclear from the bill text. If it is intended, it is bad policy. If it is not intended, it needs amendment before passage.
Section 13(d)'s ABS provisions are more straightforward and more defensible. Preventing fee-sharing with out-of-state ABS firms whose home-state regimes Illinois does not regulate, and whose work is being performed in Illinois, is a legitimate exercise of the state's interest in maintaining the integrity of its own professional regulation. California's AB 93 makes the same move on similar logic. This is the part of the bill that is most likely to survive substantively.
What this means for Illinois practitioners
The practical reality for Illinois lawyers depends substantially on what kind of practice they have.
For solo and small-firm practitioners with succession problems and no traditional buyer, the MSO conversation has been mostly theoretical. The deal sizes that capital sponsors are pursuing — the $125 million Arizona transaction announced this month, the McDermott exploration, the multi-firm Briefly platform — are not for solo practitioners. Sponsors are looking for firms with $10–100 million in annual revenue, defensible practice areas, and the operational scale to support an outside investor's underwriting model. A solo practitioner in a county-seat town does not fit this profile. The capital acceleration this installment describes is largely happening at scales the typical Illinois small-firm practitioner cannot directly access.
This matters because it qualifies the conventional consolidation thesis in a specific way. The capital narrative, taken on its own terms, says that aging solos and small firms will be absorbed into PE-backed platforms. The actual deal flow says that capital is concentrating in firms that already have scale. The aging solo with three lawyers in a non-metro county is more likely to see her practice end than to see it acquired. This is not because capital is benign or absent — it is because capital is selective.
For mid-size Illinois firms — the regional and Chicago-based firms with $20–100 million in revenue and recognizable client bases — the capital question is real and immediate. These firms are visible to sponsors. They have the operational scale that supports MSO underwriting. They face genuine technology investment requirements that current partner economics struggle to fund. If the Illinois bills become law in their current form, the operational uncertainty around even compliant MSO structures will be significant, and capital will price that risk into any deal terms — meaning Illinois mid-size firms will likely receive less attractive offers than their counterparts in jurisdictions with clearer rules.
For BigLaw firms in Illinois, the McDermott disclosure is a signal that the question has reached scales that until recently no one believed were in play. Whether that experiment proceeds, and what shape it takes, will be shaped by Illinois law in addition to ethics rules. The bills, if enacted, would constrain options.
For the legal services market overall, the Illinois bills create a binary outcome. If they pass in something close to their current form, Illinois becomes the most restrictive state in the country on outside capital — a posture that may or may not be in the long-run interest of the practitioners and clients the rules are meant to protect. If they fail or are substantially narrowed, Illinois becomes another permissive state operating under existing professional conduct rules and the persuasive guidance Texas has provided.
Where this leaves the small-firm thesis
The series's overall argument is that the consolidation forecast underestimates the small firm. The capital question, examined honestly, supports that argument — but for reasons that are different from the ones the conventional commentary tends to advance.
The conventional commentary frames capital as the threat: PE will roll up small firms, extract value, and homogenize legal services. The actual data suggest something narrower. Capital is not interested in true small firms because the underwriting math does not work at small scales. Capital is interested in mid-size and large firms because that is where the operational economies of scale and the technology investment thesis make sense. The aging solo who cannot find a successor is not, on current evidence, going to be acquired by an MSO platform. She is going to retire, dissolve her practice, or — and this is the parallel possibility this series is arguing for — find a way to operate at small scale with infrastructure that used to require institutional scale.
The technology that is driving capital's interest in mid-size firms is the same technology that is making the operational stack accessible at much smaller scales. The cost of building serious matter management, conflicts checking, document automation, clause libraries, and AI-assisted drafting infrastructure has dropped by an order of magnitude in the past three years. The infrastructure that the conventional consolidation thesis assumed could only be financed through capital is increasingly buildable by individual practitioners and small firms with the right approach. This is the substance of Part IV.
The capital question, in other words, is not the existential threat to small-firm practice that some commentary describes. It is one channel — an important one — through which mid-size firms are restructuring their economics. The threat to small-firm practice is more accurately the demographic cliff Part II described and the technology gap Part IV will describe. Capital is doing what capital does. The small firm's future is being decided on a different track.
The threat to small-firm practice is more accurately the demographic cliff and the technology gap. Capital is doing what capital does. The small firm's future is being decided on a different track.
What to watch
Three things will determine the trajectory of the Illinois capital question over the next year.
The first is what happens to SB3812 and HB5487 in the General Assembly. The bills are advancing — HB5487 cleared committee on March 25 and is on the House floor — but the breadth of their language has drawn substantive opposition from organized parts of the legal industry. The bills' final form, if they pass, may be considerably narrower than introduced. Watch the language of Section 13(b)(3) in particular.
The second is what the Illinois Supreme Court does. Either the Court will assert its regulatory authority and issue meaningful guidance on MSO structures — possibly preempting parts of the legislative effort under separation-of-powers principles — or it will allow the legislature to act first. Either choice is a choice. The ARDC's posture in any litigation will signal where the Court is heading.
The third is what national deal flow looks like over the next twelve months. The McDermott exploration will resolve one way or another. More mid-size firm transactions will close. The Arizona ABS regime will produce more data on outcomes. Capital will either find that the legal services sector lives up to its underwriting models or that the model is harder to execute than expected. Either outcome will shape what the next round of Illinois deals looks like.
Part IV — the final installment of this series — turns to the third force: technology, generative AI, and the question of what they actually do to the cost structure of substantive legal practice. That installment is also where the counter-thesis this series has been building toward gets its full statement. It runs next week.
SOURCES & VERIFICATION
SB3812 and HB5487 are documented at the Illinois General Assembly's bill status pages; the bill text is publicly available through ilga.gov. Holland & Knight's February 2026 analysis and the DLA Piper alert dated February 11, 2026 provide the most thorough public commentary on the bills' substance. Texas Opinion 706 is from the Professional Ethics Committee for the State Bar of Texas (February 2025); the Holland & Knight, ABA Law Practice Magazine (Jan/Feb 2026), and Sidley analyses cited here are all publicly available. The Rimon/Alpine/NovaLaw transaction is described in Rimon's own communications and in the Bloomberg Law and Eudia coverage. McDermott Will & Schulte's November 2025 disclosure was confirmed by firm chairman Ira Coleman in a public statement and reported in Bloomberg Law and the Financial Times. PitchBook legal technology investment figures are from Eudia's reporting on PitchBook data. Sidley's data on Arizona ABS approvals (136 entities as of April 30, 2025) is from their November 2025 client alert. The McDermott bid statistics, the $125M Arizona MSO transaction, California AB 93, and the survey of pending state legislation in Washington/Indiana/Minnesota all come from publicly reported industry sources, principally Bloomberg Law and Reed Smith. UK ABS investment figures (£1.2 billion over five years; £534 million in 2024) reflect industry reporting summarized in earlier source material; specific UK case studies are not relied upon for substantive claims here.
ABOUT THE AUTHOR
RM is an Illinois transactional attorney and the founder of Nomos Insights LLC, a solo practice combining substantive legal counsel with proprietary operational infrastructure. He writes about the structural forces reshaping legal practice and what they mean for solo and small-firm lawyers. Practice with intent.