Why Law Firms Merge: The Data Behind the Consolidation Wave

The numbers tell a dramatic story.

Twenty-two years ago, only two law firms in the AmLaw 100 generated a billion dollars in annual revenue. Today, 54 firms have crossed that threshold. Seven firms now generate between $3 billion and nearly $8 billion annually. The average AmLaw 100 firm has grown from $381 million in revenue in 2002 to $1.4 billion in 2024—nearly a fourfold increase.

This isn’t just growth. It’s consolidation. And the gap between the AmLaw 100 and everyone else is widening.

The Growing Divide

The total revenue of the AmLaw 100 reached approximately $140 billion in 2024, compared to $38 billion twenty-two years ago. Meanwhile, the second hundred firms—the AmLaw 200—collectively generate only $24-25 billion. That’s a five-fold difference in total revenue between the top 100 and the next 100 firms.

From a headcount perspective, the AmLaw 100 now employs roughly 117,000-118,000 attorneys, more than double the 60,000 attorneys they had in 2002. The average firm size has grown from 600-700 attorneys to 1,100-1,200 attorneys. Compare that to the AmLaw 200, which averages just 300-350 attorneys per firm with only 33,000 total lawyers across all 100 firms.

Revenue per lawyer in the AmLaw 100 averages $1.2 million, while the AmLaw 200 averages $850,000. Profits per partner? The AmLaw 100 averages $2.8 million compared to $1.2 million for the AmLaw 200.

We’re talking about apples and oranges here. The competition is moving the goalposts every year, and the gap continues to widen.

What Law Firm Leaders Are Actually Saying

The reasons behind major law firm mergers are remarkably consistent. When you listen to what managing partners and chairs say about their combinations, clear themes emerge around competition, client needs, and talent retention.

Take the Kramer Levin and Herbert Smith Freehills merger announced in November 2024. The combination created a firm of 2,700 attorneys with more than $2 billion in revenue. Herbert Smith Freehills had a clear strategic imperative: breaking into the US market. They were actively exploring transatlantic mergers and seized an opportunity to build what they called “an exciting international law firm.”

Lewis Roca merging with Womble Bond Dickinson provides another data point. Merrick Benn, Chair and CEO of Womble, was direct about the rationale: “Both of our firms recognize that there’s a need to build scale, to have a deeper bench in order to provide the type of legal services that our clients need both in terms of skill set and also geographic reach.” The combined firm now has 1,300 attorneys across the US and UK with nearly $750 million in revenue.

Lane Powell, based in Seattle, faced what many regional firms experience. As their leadership put it: “We’re very strong in our market, but we feel like we’re just hitting the limits of our platform, and this combination will really allow us to do so much more for our clients and for our talented lawyers and business professionals.” Their merger with Ballard Spahr created a 750-attorney firm with nearly $600 million in combined revenue. The stated goal? Expand client relationships and attract talent beyond the Pacific Northwest.

The Troutman Pepper and Locke Lord combination, announced in April 2024 with partner votes in September, offers perhaps the most revealing commentary. David Taylor, Chair of Locke Lord, explained that the merger “offers Locke Lord much needed scale, tripling the firm’s attorney headcount after steady departures in the decades since its last combination.”

Taylor continued: “The expanded footprint of Troutman Pepper Locke Lord will allow us to offer a far deeper bench of attorneys to advise clients on complex transactions, litigation and regulatory matters. In addition, our lawyers are aligned on core values with a commitment to innovation, inclusion and pro bono services.”

Notice the language: deeper bench, alignment on core values. These mergers work because firms have done the hard work to figure out who creates alignment and momentum—not just for their clients, but for their talent internally. The result? A firm of 1,600 attorneys with $1.5 billion in revenue.

The Ulmer Berne and Greensfelder combination, completed in February 2024, offers insights into the challenges mid-size firms face. Speaking with both Scott Kadish and Kevin McLaughlin revealed the pressures driving the combination.

For Greensfelder, the competition continued to grow. They were losing ground. Adding one to two laterals was not a viable growth strategy—it felt like swimming upstream. They set out to do a merger of equals, which proved very difficult. While there were a number of platforms that were viable, most would have led to significant attrition.

What made this merger both difficult and attractive was that it truly was a combination of equals. The firms looked at best-in-industry approaches versus defaulting to their current systems. Their cultures were remarkably similar with common values, goals and people. Both wanted to grow their Chicago presence. They were 90-95% aligned, but it took a lot of work to make that final 5-10% work.

Post-merger, their clients were very happy. The platform added so much more depth, and the combined firm is getting in front of clients and talent they never could have accessed before. The combination created an AmLaw 200 firm with 300 attorneys and revenue reaching over $180 million.

Why This Matters to You

The recurring themes across all these mergers are impossible to ignore: competition, client service expansion, talent attraction and retention.

Clients have important and evolving needs. They need bench depth. They make decisions that involve their careers, their reputations, and significant risk. One of the single greatest reasons firms are not being selected for high-value work is perception of size, bench depth, and capabilities.

Some managing partners know they have very strong teams. But the perception of the overall firm—its size, its locations—matters to clients who are growing and want to continue growing. Clients are consolidating. They’re looking for firms with capabilities and specialties that can respond immediately when needed.

Size matters to clients. Larger firms signal better attorneys, deeper benches, more expertise, and broader geographic coverage. For business-critical and transformative matters that promise higher fees but also carry career risk for the client, no one wants to be blamed for hiring the “smaller firm” and having a matter go south. Size mitigates the risk clients feel.

The Economics of Growth

For most firms in the AmLaw 200 or smaller, adding ones and twos in small groups isn’t cutting it anymore. Many are wrestling with losing their best people while simultaneously losing ground. It’s not just about losing clients—it’s about getting the best work from those clients. As firms grow, they access more profitable work, more meaningful work, the work that law firms want for their teams.

And it’s about keeping talent and recruiting new talent. Clients want to see depth. They’re attracted to it. We all know clients hire lawyers, but law firm brands still matter significantly.

The largest law firms are moving the goalposts. When you look at the mergers announced in 2024, the size of firms, revenue, and headcount continue to climb. When you have more lawyers billing at higher rates, it creates more resources to hire better talent, attract better talent, bring in professional non-attorney management teams, and invest in clients and technology. This makes competition increasingly challenging.

The Path Forward

When mergers occur successfully, they happen because of alignment—alignment in economics, alignment in culture and values. The work involves speaking with law firm executives and creating perfect matches that accelerate mutual goals with clear alignment.

Meaningful growth transactions are also more cost-effective than the traditional lateral recruiting model. When you look at the cost per attorney in the recruiting process, hiring 50, 100, or 200+ attorneys through a combination is dramatically more efficient than ones and twos. The cost-effectiveness comparison isn’t even close.

Scale matters. It’s about competition. Your competition continues to raise the bar, and the data shows this trend is accelerating, not slowing down. The question for mid-size firm leaders is no longer whether consolidation will impact their market—it’s how they’ll respond to it.