The largest immigration law firm in the U.S. is Fragomen, Del Rey, Bernsen & Loewy LLP. Fragomen reported 783 U.S. attorneys and gross revenue of $900,383,000 in 2024, placing it 62nd on The American Lawyer's 2025 Am Law 200 and 69th on the National Law Journal's 2025 NLJ 500, the highest ranking of any immigration-only firm on either list.
That answer changes depending on what "largest" measures. Revenue, attorney headcount, office count, and case volume each produce a different leaderboard. Full-service labor and employment firms run immigration practices bigger than most boutique firms, and non-law-firm mobility providers handle more immigration volume than any single law firm.
This guide ranks the firms that come up most often in each category, explains why the rankings differ, and shows what firm size actually changes for a client or a hiring employer.
Key Takeaways
- Fragomen is the largest immigration-only law firm in the U.S. by both revenue and attorney headcount.
- Berry Appleman & Leiden (BAL) is the largest dedicated rival to Fragomen, with 13 U.S. offices after absorbing part of Seyfarth Shaw's immigration team.
- Full-service labor and employment firms, including Ogletree Deakins, Greenberg Traurig, and Jackson Lewis, run immigration practices larger than most stand-alone immigration firms.
- Vialto Partners, a global mobility consultancy, employs more immigration professionals than any law firm on this list, but it is not a law firm and cannot represent clients the way a licensed firm can.
- Mid-sized and regional boutiques still handle a meaningful share of complex, high-touch immigration work.
What "Largest" Means Depends on How You Measure It
Legal industry rankings like the Am Law 200 and the NLJ 500 measure gross revenue and attorney headcount. Those numbers favor firms structured as traditional law partnerships, like Fragomen and BAL.
A different picture appears when you count immigration professionals inside larger, multi-practice firms. Ogletree Deakins and Greenberg Traurig do not appear on immigration-specific rankings the way Fragomen does, but each runs an immigration group with more attorneys and staff than most stand-alone immigration firms employ firmwide.
A third picture appears when you count case volume or global reach instead of headcount. Non-law-firm providers like Vialto Partners process immigration and mobility work for corporate clients across more than 150 countries, without practicing law directly themselves.
No single ranking captures all three. The table below groups firms by how they compete, so the comparison is closer to apples-to-apples.
The Largest Immigration Law Firms in the U.S.
Specialized Immigration-Only Law Firms
The firms in this group practice immigration law exclusively. They compete directly on the Am Law and NLJ rankings, which is why they top the list by revenue and headcount.
Fragomen, Del Rey, Bernsen & Loewy LLP
Fragomen is the dominant, top-tier global provider of corporate immigration services and the highest-grossing immigration-only firm in the world. The firm employs more than 6,000 professionals across nearly 70 offices, including 783 domestic attorneys in the United States, according to Law.com.
Berry Appleman & Leiden (BAL)
BAL is Fragomen's primary dedicated rival, focused on high-volume, employer-sponsored corporate immigration programs. In 2024, the firm absorbed roughly 90 lawyers and staff from Seyfarth Shaw's immigration group and opened a 13th U.S. office in Atlanta to house the new team, according to the ABA Journal.
Labor & Employment and Full-Service Giants
Fragomen and BAL compete as immigration specialists. The next group takes a different path to scale: immigration is one practice inside a much larger firm, and that firm's other practice areas fund the growth.
Ogletree Deakins
Ogletree Deakins has more than 1,100 attorneys firmwide and describes its immigration group as one of the largest business immigration practices in the United States. Through its global alliance network, the firm draws on more than 2,000 immigration professionals worldwide and handles nearly 25,000 global transactions a year in more than 140 countries, according to Ogletree Deakins.
Greenberg Traurig
Greenberg Traurig is one of the largest full-service firms in the U.S., with roughly 3,100 attorneys across 51 offices, according to Best Law Firms. Its Immigration & Compliance practice fields more than 150 dedicated immigration professionals worldwide, per Greenberg Traurig.
Jackson Lewis P.C.
Jackson Lewis is a nationwide workplace law firm with more than 1,100 attorneys located in major U.S. cities, according to Jackson Lewis. Its Immigration Practice Group advises employers on visa strategy, global mobility, and I-9 compliance across every region the firm serves.
Non-Traditional Advisory and Platform Competitors
Law firms are not the only ones competing for this work. Global mobility consultancies and technology-driven platforms have grown into major competitors for corporate immigration cases, even though most are not licensed to practice law themselves.
Vialto Partners
Vialto is the largest non-law-firm competitor in the corporate immigration and global mobility market. The firm employs more than 6,000 immigration, tax, and technology professionals across more than 150 countries, delivering immigration services alongside corporate tax and business travel support, according to Vialto Partners. Because Vialto is a consultancy rather than a law firm, it pairs its services with local licensed counsel where legal representation is required.
Envoy Global and Corporate Immigration Partners
Envoy Global provides a software platform for managing corporate immigration cases and pairs that platform with affiliated law firms that handle the licensed legal work, such as Global Immigration Associates, P.C., according to BusinessWire. The model separates case-management technology from legal representation, coordinated through shared service hubs.
Large Mid-Sized and Regional Boutiques
Below the giants, a group of specialized boutiques handle a meaningful share of complex immigration work, often for high-skill professionals, startups, and regional corporate clients.
Colombo & Hurd, PL
Founded in 2006 by immigrants, Colombo & Hurd has grown into a firm of more than 350 professionals, including more than 30 immigration attorneys, according to its firm history. The firm focuses heavily on self-sponsored categories, including the EB-2 National Interest Waiver and EB-1A for individuals of extraordinary ability.
WR Immigration
WR Immigration, formerly Wolfsdorf Rosenthal LLP, has grown by bringing independent immigration firms under one roof. Boston's Chin & Curtis joined as a partner firm in 2021 while keeping its own attorneys and staff, according to BusinessWire. That model gives the firm a footprint across the U.S. and in Shanghai without a single, centralized office structure.
Foster LLP
Foster LLP has provided immigration compliance services out of Houston since 1973. The firm now employs more than 100 lawyers, legal assistants, and other professionals across principal offices in Houston, Austin, and Dallas, per its firm history.
Erickson Immigration Group (EIG)
EIG is a bicoastal boutique serving corporate clients in technology, finance, and healthcare. The firm has grown through targeted lateral hiring to serve fast-growing employer accounts, though its current attorney and staff count is not consistently reported and should be confirmed directly with the firm before citing a specific figure.
Specialized Immigration Firm vs. Immigration Practice at a Full-Service Firm
Two models keep showing up in the profiles above: firms built around immigration alone, and immigration teams inside a much larger firm. Here is how the two actually compare.
Neither model is inherently better. A firm choosing between them is really choosing between depth in one practice area and breadth across several.
What Firm Size Actually Changes for a Client
The table above compares how the two models operate. What it does not show is what a client or a hiring employer actually feels on their own case.
A bigger firm generally means more offices, more languages spoken in-house, and more capacity to handle a large volume of cases at once. It does not automatically mean faster turnaround or better outcomes on any single case.
Case quality depends more on the attorney and team assigned to a specific matter than on firm size alone. A well-run boutique with a tight caseload can move faster on an individual case than a large firm juggling thousands of matters across regions.
Firm size matters most for employers running large-scale visa programs across many employees and countries. It matters less for an individual applicant or a single company with a handful of cases a year.
How Growing Firms Compete With Firm Size
Firms below the giants on this list rarely compete by adding headcount at the same pace as Fragomen or Vialto. Most compete by handling more cases with the staff they already have.
Automating client intake removes one of the biggest bottlenecks for a growing firm, since AI Intake runs a 24/7 process that captures and screens leads without adding front-desk staff. AI Case Assembly automates the final stage of a case, where forms, exhibits, and evidence come together into a submission-ready packet, with a similar effect on capacity.
Neither step replaces attorney judgment. Every output still goes through human review before it reaches a client or a government agency.
Size Is One Data Point, Not the Whole Picture
Use this list to understand the market, not to pick a firm on size alone. If you are comparing firms for a specific case, ask about the attorney who will actually handle it, the firm's experience with your visa category, and its current caseload, not just its place on a revenue ranking.
Rankings like the Am Law 200 and the NLJ 500 update every year, and firm size shifts with every lateral move, merger, or partner-firm combination described above. Treat any "largest" list, including this one, as a snapshot rather than a permanent fact.
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