How the US Law Firm Market Is Really Structured, From Solos to the Am Law 100

Abstract

This study describes the structure of the United States private legal services market using publicly documented data through late 2025. We draw on the American Bar Association’s lawyer population surveys, the Bureau of Labor Statistics wage and employment series, United States Census Bureau establishment counts, National Association for Law Placement reports, and the two most cited industry rankings, the American Lawyer’s Am Law 100 and 200 and the National Law Journal 500. The picture that emerges has two features that pull in opposite directions. By headcount, the market is dominated by very small firms, with solo practitioners accounting for roughly half of all lawyers in private practice. By revenue, a narrow band of the largest firms captures a share of dollars far out of proportion to its share of lawyers, and that concentration grew over the decade from 2013 to 2023. We document three structural shifts: gross revenue at the top hundred firms roughly doubling across the period, the spread and deepening of the two-tier partnership through nonequity ranks, and a steady rhythm of mergers alongside a shorter list of high-profile dissolutions. We treat the rankings as a census of the visible top of the market rather than the whole, and we read the dissolution case law, including Jewel v. Boxer and In re Thelen LLP, as evidence of how firm failure has been litigated.

Background

The phrase “law firm market” flattens something that is not one market at all. A solo practitioner handling residential closings in a county seat and a global firm advising on a cross-border merger both sell legal services. They do not compete, price the same way, or draw from the same client pool. Any honest description of the industry has to hold both ends in view at once.

Two facts define the frame. The first is the size of the profession. The American Bar Association’s National Lawyer Population Survey put the number of active, licensed attorneys in the United States at roughly 1.3 million in the early 2020s, up from about 1.2 million a decade earlier. The second is the distribution of those lawyers across employers. Most are not in the giant firms that generate the headlines. A large share are solo or in small firms, and another large share work in settings that are not private practice at all, including government, corporate legal departments, the judiciary, and legal aid.

The market has been legally shaped for half a century by antitrust and speech doctrine. In Goldfarb v. Virginia State Bar, 421 U.S. 773 (1975), the Supreme Court held that the practice of law is trade or commerce for purposes of the Sherman Act and struck down a county bar’s minimum fee schedule. Two years later, in Bates v. State Bar of Arizona, 433 U.S. 350 (1977), the Court held that truthful lawyer advertising is protected commercial speech. Together those decisions removed price and information controls that had muffled competition among firms. The consolidation and concentration we describe below happened inside the market those cases opened.

Rankings arrived later and changed how the top of the market saw itself. The American Lawyer began publishing revenue-based rankings of the largest firms in the 1980s, and the Am Law 100 became the industry’s scoreboard for gross revenue, revenue per lawyer, and profits per equity partner. The National Law Journal’s list of the largest firms, now the NLJ 500, ranks by attorney headcount. These are commercial products built from survey responses and reporting, not government statistics. They are also the best continuous public record we have of the visible top tier, and they have been collected long enough to support decade-length comparisons.

Data and method

We assembled this study from five kinds of public sources and treated each for what it can and cannot show.

For the population and its distribution across practice settings, we used the ABA’s National Lawyer Population Survey and its Profile of the Legal Profession, which compile figures reported by state licensing authorities. These sources are strong on totals and weak on granular firm structure, because a bar license does not record employer size.

For employment and pay in law offices as an industry, we used the Bureau of Labor Statistics Occupational Employment and Wage Statistics program and the Occupational Outlook Handbook. BLS counts wage and salary lawyers and reports median and mean pay. It does not count self-employed solo practitioners in its employment series, which matters, because self-employment is common at the small end.

For the count and size of business establishments, we used the Census Bureau’s County Business Patterns and Economic Census data on offices of lawyers. Census counts establishments and payroll, which lets us see how many law offices exist and how few employees most of them have.

For partnership structure, including the equity and nonequity split, we relied on National Association for Law Placement reports and on the compensation and structure surveys that circulate publicly through industry reporting.

For the top tier over time, we used the Am Law 100 and Am Law 200 revenue rankings and the NLJ 500 headcount rankings. We compare the reporting year around 2013 with the reporting year around 2023, a full decade, and we describe direction and magnitude in words where a specific figure is uncertain or where methods changed between years.

Where numbers are firm and widely reported, we give them and name the source in the text. Where a precise figure would imply more accuracy than the public record supports, we characterize the trend instead. We do not blend commercial rankings with government counts into a single denominator, because they measure different things. The rankings measure firms that choose to report or that reporters can document. The government counts measure licensed people and registered establishments.

Findings

The size distribution is bottom-heavy

Start with the shape most people never see. The typical law office is tiny.

Census establishment data on offices of lawyers describe a market with well over a hundred thousand establishments, the large majority of which have very few employees, and a substantial number of which have no paid employees at all beyond the owner. The modal law office in the United States is one lawyer working alone or with a small support staff. That has been true for as long as the data have been collected, and it did not change over the decade we studied.

The ABA’s data on practice setting point the same way. Historically, roughly three quarters of lawyers who are in private practice work in firms, and among all private practitioners, close to half are solo. The most cited detailed breakdown, from the ABA’s Lawyer Statistical Report drawing on 2005 data, put solo practitioners at about 49 percent of lawyers in private practice, with another large block in firms of two to five lawyers. Later ABA profiles describe a similar shape, with solo and small-firm practice continuing to hold roughly half of the private bar even as the biggest firms grew.

So the market has a long tail. Thousands upon thousands of small shops handle the bulk of ordinary legal work in the country, family law, criminal defense, estate planning, personal injury, small business matters, residential real estate. They rarely appear in any ranking. They are the market by count of firms and by count of lawyers touching everyday clients. They are a small share of the market by aggregate revenue.

BLS data help explain why the small end is partly invisible in employment statistics. The bureau’s occupational employment series counts wage and salary lawyers in the hundreds of thousands, with a median annual wage for lawyers in the mid one hundred thousands as of the 2023 estimates. Self-employed solos are largely outside that count. When you read a BLS lawyer employment number, you are reading the employed core, not the self-employed periphery, and the periphery is large.

Revenue concentrates at the top

Now flip the lens from headcount to dollars, and the market inverts.

The Am Law 100 ranks the hundred largest United States based firms by gross revenue. Across the decade from roughly 2013 to 2023, the combined gross revenue of that group climbed from something on the order of the low to mid seventies of billions of dollars to a figure that crossed one hundred thirty billion dollars, as reported by the American Lawyer. That is close to a doubling in ten years, far outpacing inflation and far outpacing the growth in the number of lawyers.

Concentration is visible even inside the top hundred. The gap between the largest firms and the hundredth largest is wide, and it widened. At the very top, Kirkland & Ellis became the first firm to report gross revenue above five billion dollars, then above six billion, and by the 2023 reporting year its revenue was above seven billion dollars, the largest of any firm in the ranking. A handful of other firms, including Latham & Watkins, reported revenue above the five billion mark. These are single firms generating revenue that, a decade earlier, would have been unthinkable for one partnership.

Profitability told the same story of separation. Profits per equity partner at the most profitable firms moved well past the seven and eight million dollar range, with Wachtell, Lipton, Rosen & Katz regularly reported at the top of the profitability rankings and Kirkland among the highest in absolute profit. The spread between the most profitable firms and the median Am Law 100 firm grew, which is another way of saying that the rewards concentrated toward the peak.

Step down one tier and the drop is steep. The second hundred firms, ranked 101 through 200 in the Am Law 200, together generate far less revenue than the top hundred despite having a comparable number of firms. Revenue per lawyer, the rankings’ rough proxy for the value of the work, falls sharply as you move down the list. The top tier is not just bigger. It does different, higher-priced work, concentrated in transactions, disputes, and regulatory matters for large corporate and financial clients.

The NLJ 500, which ranks by attorney headcount rather than revenue, adds a second axis to the same story. The largest firms by headcount employ thousands of lawyers each, and the very biggest by lawyer count, built through international combinations and Swiss verein structures, report headcounts that would have described an entire mid-sized city bar a generation ago. Revenue rank and headcount rank do not always agree, which is itself informative. A firm can be enormous by headcount and only moderately ranked by revenue, and a firm can be leaner by headcount and near the top by revenue. Kirkland’s position, high on both lists, reflects a model that paired scale with high revenue per lawyer.

Read together, the two rankings show a top tier that grew faster than the market around it, both in dollars and in people, and a peak within that tier that pulled away from the rest.

The nonequity tier reshaped what “partner” means

The word partner used to carry a single meaning. It meant an owner who shared the firm’s profits and risk. Over the decade we studied, that meaning split in two across most large firms.

The two-tier partnership divides partners into equity partners, who own a stake and share profits, and nonequity partners, who hold the title, often draw a fixed or largely fixed compensation, and do not share in the residual profit the way equity holders do. The tier is not new. What changed is how large it became and how widely it spread.

Across the Am Law 200 and the broader set of large firms tracked by NALP and industry compensation surveys, the nonequity ranks grew as a share of total partners through the decade. In many large firms the nonequity partners came to represent a large minority of all partners, and in some the two groups approached parity. The equity tier, meanwhile, grew slowly or held roughly flat at some firms even as headcount rose, which is how profits per equity partner could climb: a growing revenue base divided among a more tightly controlled group of owners.

The structure has clear economic logic from the firm’s point of view. A nonequity tier lets a firm retain and title senior lawyers, and to signal seniority to clients, without diluting the equity pool. It creates a longer runway between senior associate and full ownership. It also gives management a lever over the profit-per-partner figure that the rankings publicize, because that figure uses equity partners as its denominator.

For the individual lawyer, the tier changed the shape of a career. The old path ran from associate to partner in a single step that meant ownership. The common path now runs associate, then income or nonequity partner, then, for some, equity partner, with each step gated separately. The title arrives earlier than ownership does, and for a meaningful share of nonequity partners, ownership never arrives at all.

We flag a measurement problem here that we return to in the limitations. Because firms control how they classify partners and how they report to the rankings, and because the equity denominator drives a published metric, there is a reporting incentive to keep the equity count lean. The direction of that incentive is consistent with the concentration we observe, and it means the equity partner counts should be read as management-influenced figures rather than neutral facts.

A decade of consolidation, and a shorter list of collapses

Consolidation in this market runs in two channels. Firms combine, and firms fail. Both moved lawyers and revenue toward larger platforms.

The combination channel ran steadily. Industry trackers of law firm mergers, including the widely cited MergerLine and Fairfax Associates data, recorded dozens of United States law firm combinations in most years of the decade, a mix of small firms folding into larger ones and a smaller number of large, transformational unions. Among the large ones documented in the public record: Bryan Cave and Berwin Leighton Paisner combined in 2018 to form Bryan Cave Leighton Paisner; Faegre Baker Daniels and Drinker Biddle & Reath combined in 2020 to form Faegre Drinker; Troutman Sanders and Pepper Hamilton combined in 2020 to form Troutman Pepper; Holland & Knight and Thompson & Knight combined in 2021. The pattern continued into the mid 2020s. Allen & Overy and Shearman & Sterling completed a transatlantic combination to form A&O Shearman in 2024, and Troutman Pepper combined with Locke Lord to form Troutman Pepper Locke, effective at the start of 2025.

The failure channel ran through the same years, concentrated near the start. The collapse of Dewey & LeBoeuf in 2012 was the largest law firm bankruptcy in United States history and became the reference point for how a large modern firm can unwind. It followed a cluster of earlier failures, including Heller Ehrman and Thelen in 2008 and Howrey in 2011. When these firms dissolved, their lawyers and clients did not leave the market. They moved, overwhelmingly, to larger surviving platforms, which is consolidation by another route.

Firm dissolution produced its own body of law, and it is worth reading because it shows what is contested when a firm dies. Under the doctrine associated with Jewel v. Boxer, 156 Cal. App. 3d 171 (Cal. Ct. App. 1984), profits from a dissolved partnership’s unfinished business could be treated as an asset of the old partnership, obligating departing partners to account for work they completed elsewhere. Bankruptcy estates of failed firms used that theory to pursue former partners and their new firms. Courts then pushed back. The New York Court of Appeals, answering a certified question in In re Thelen LLP, 24 N.Y.3d 16 (N.Y. 2014), held that pending hourly fee matters are not partnership property or an asset for unfinished business purposes under New York law. The practical effect was to make it easier for lawyers to leave a failing firm with their client matters, which in turn made the market’s response to firm failure faster and cleaner: clients follow lawyers to the acquirer, and the platform absorbs the practice.

The net of both channels over the decade was accumulation at the top. Revenue, lawyers, and marquee practices moved toward the largest firms, whether through negotiated mergers or through the redistribution that follows a collapse.

What the two ranking systems agree on, and where they diverge

The Am Law revenue rankings and the NLJ 500 headcount rankings are built from overlapping but distinct data, and comparing them is instructive.

They agree that the top of the market grew. Both the aggregate revenue of the largest firms and the aggregate headcount of the largest firms rose across the decade, and both show the biggest platforms growing faster than the group as a whole.

They diverge on which firms sit at the very top, and that divergence carries meaning. Headcount leaders built through international networks and verein structures can report lawyer counts far above their revenue rank, because much of that headcount sits in lower-billing markets. Revenue leaders concentrated in high-margin transactional and disputes work can rank far higher by revenue than by headcount. The distance between a firm’s two ranks is a rough read on its business model: work-per-lawyer value on one axis, scale on the other.

Neither ranking captures the small-firm market at all. That is not a flaw in the rankings, which never claimed to. It is a reason not to mistake the rankings for the market. When we say concentration increased, we mean concentration within and toward the documented top tier, measured against a total that includes a vast, low-revenue, high-count tail the rankings do not reach.

Discussion

Put the findings side by side and the market’s shape is a barbell with a very long, thin bar on one end.

At one end sit hundreds of thousands of solo and small-firm lawyers who together account for about half the private bar by count and a modest share of aggregate revenue. At the other end sit roughly a hundred firms that, by the 2023 reporting year, generated more than one hundred thirty billion dollars in combined revenue and pulled further ahead of everyone else across the decade. In the middle sits a mid-market of regional and specialized firms that neither the smallest solos nor the global platforms describe.

The interesting question is why the two ends behaved so differently over ten years. The small end was stable in structure. The share of lawyers in solo and small practice did not collapse, and the modal law office stayed tiny. The large end restructured itself, through mergers, through the deepening of the nonequity tier, and through the redistribution that followed the failures of the early decade. Concentration at the top did not come at the expense of the small end so much as alongside it, in a different part of the market serving different clients.

The nonequity tier deserves emphasis because it connects the structural story to the profitability story. Profits per equity partner, the number the rankings publicize and that firms compete on, is a ratio. Its numerator is profit and its denominator is equity partners. A firm can raise that ratio by growing profit, by shrinking or holding the equity count, or both. The spread of the nonequity tier gave firms a way to add senior lawyers, and to keep them, without adding to the denominator. Concentration of ownership and concentration of profit are, in that sense, the same phenomenon viewed from two angles.

The legal doctrine we cited is part of the mechanism, not decoration. The retreat from an expansive unfinished business rule, marked by In re Thelen LLP, lowered the friction of moving from a failing firm to a surviving one. Lower friction on lawyer mobility makes the market’s response to firm failure faster, and it makes acquisition of a distressed firm’s practice more attractive to the acquirer, because the incoming partners are less exposed to clawback claims. Doctrine that started as a fight over who gets the fees from a dead firm’s cases ended up shaping how quickly the market reconsolidates after a collapse.

We resist a common overstatement. The growth of the giant firms does not mean the profession is becoming a handful of megafirms. By count of lawyers and count of firms, the market remains overwhelmingly small and local. The concentration is real, and it is concentrated, precisely, at the top, in the segment that serves large organizations and that the rankings were built to observe. A resident hiring a lawyer to draft a will or contest a ticket meets the other market, the one with hundreds of thousands of practitioners and no scoreboard.

One more implication follows from the antitrust and speech cases that opened this study. Goldfarb and Bates made the legal market a competitive market in law. Competition among firms for lateral partners, for high-margin work, and for position in the rankings is part of what drove the top tier to grow and to restructure. The rankings themselves became a competitive instrument. A published revenue and profitability table gives firms a public metric to compete on and gives lateral partners a public signal to move toward. The scoreboard changed the game it was built to measure.

Limitations

This study rests on public data with known gaps, and readers should weight the conclusions accordingly.

The commercial rankings are self-selected and reporter-assembled. Firms decide whether and how to participate, and some large privately held firms report little. The revenue and profit figures reflect firm disclosures and estimates, not audited public filings, because these are private partnerships. Year-to-year methodology changes at the American Lawyer and the National Law Journal can move figures independent of any real change in the firms.

The equity and nonequity counts are influenced by management choices and by the reporting incentive we described, which means the profits-per-equity-partner series should be read as a competitive metric that firms manage, not as a neutral measurement of ownership economics.

The government data measure different objects than the rankings do. ABA counts licensed lawyers, some of whom are inactive or practicing outside firms. BLS counts employed wage and salary lawyers and largely omits the self-employed. Census counts establishments and payroll. None of these maps cleanly onto the ranking universe, so we describe the two worlds separately rather than forcing a single denominator.

Our decade comparison anchors on the 2013 and 2023 reporting years. Choosing different endpoints would shift specific magnitudes, though the direction of the trends we report, growth and concentration at the top and stability of the small end, holds across reasonable endpoint choices.

Finally, we describe the United States market. International verein structures and cross-border combinations complicate what “a United States firm” even means, and headcount rankings that include foreign offices are not directly comparable to revenue figures that some sources report on a United States or global basis without a consistent boundary.

Conclusion

The United States law firm market has two shapes at once, and reading only one of them produces a false picture. Counted by lawyers and by firms, it is a market of small shops, with solo practice holding about half the private bar and the modal law office employing a handful of people. Counted by revenue, it is a market with a heavy top, where roughly a hundred firms crossed one hundred thirty billion dollars in combined revenue by 2023 and where the peak, led by a firm reporting more than seven billion dollars on its own, pulled away from the rest.

Over the decade we studied, the small end held its shape and the top end restructured. Mergers ran steadily, a cluster of large firms failed near the start of the period and their people and clients moved to larger survivors, and the two-tier partnership deepened until nonequity partners were a large share of the partnership at many firms. Dissolution litigation, from Jewel v. Boxer through In re Thelen LLP, shaped how fast that reconsolidation could happen. The rankings that document all of this are the best continuous public record of the top tier and a poor guide to everything below it. We read them as a census of the visible peak, and we keep the long tail in view beside them.

References

• American Bar Association, Profile of the Legal Profession. https://www.americanbar.org
• American Bar Association, National Lawyer Population Survey. https://www.americanbar.org
• U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, Lawyers. https://www.bls.gov/oes/
• U.S. Bureau of Labor Statistics, Occupational Outlook Handbook, Lawyers. https://www.bls.gov/ooh/
• U.S. Census Bureau, County Business Patterns and Economic Census, Offices of Lawyers. https://www.census.gov
• National Association for Law Placement (NALP), research and reports. https://www.nalp.org
• Goldfarb v. Virginia State Bar, 421 U.S. 773 (1975). https://supreme.justia.com
• Bates v. State Bar of Arizona, 433 U.S. 350 (1977). https://supreme.justia.com
• Jewel v. Boxer, 156 Cal. App. 3d 171 (Cal. Ct. App. 1984). https://law.justia.com
• In re Thelen LLP, 24 N.Y.3d 16 (N.Y. 2014), New York State Unified Court System. https://www.nycourts.gov
• The American Lawyer, Am Law 100 and Am Law 200 rankings, ALM. https://www.law.com/americanlawyer/
• The State Bar of California, attorney population and licensing data. https://www.calbar.ca.gov