Legal 500, Chambers and IFLR1000: What's the Difference?
Every year, law firms around the world compete for a place in three major legal directories: The Legal 500, Chambers and Partners, and IFLR1000. From the outside, they look alike. Each one ranks law firms and lawyers, and each one is read by clients choosing legal advisers. But they work differently and reward different strengths. A firm that understands these differences can focus its efforts where they count.
How the rankings work
The process is much the same for all three. A firm sends a written application, called a submission, describing its lawyers and its most important recent work. It also gives the names of clients who are willing to talk about their experience. These clients are called referees. Researchers then read the submissions, contact the clients and speak to other lawyers in the market before deciding who gets ranked. Taking part is free.
The Legal 500: the whole team
The Legal 500 mainly looks at law firm departments as a whole. It asks how strong a firm's banking team is, or its litigation team, rather than focusing on one star lawyer.
Its research combines written submissions, conversations with the heads of each department, and a large client survey. The Legal 500 says it contacts more than 300,000 clients of law firms every year. Researchers look at the difficulty of the work, the depth of the team, client relationships and, increasingly, how firms use technology. No single factor decides the result.
The Legal 500 has also started giving more room to smaller and regional firms. In 2026 it added separate rankings for boutique firms (small, specialised firms) in areas such as disputes and media law, and a new guide to private client work.
A good fit for: full-service and mid-sized firms that are strong in many areas, boutique firms, and firms whose strength is the team rather than one or two famous partners.
Chambers and Partners: individual lawyers
Chambers puts more weight on individual lawyers. It ranks firms too, but its rankings of individual partners carry a lot of weight in the market. A lawyer can appear in Chambers even when their firm does not, and the other way round.
Chambers bases its research on conversations. Its team of around 330 researchers carries out more than 350,000 interviews and surveys a year. What clients say is often the deciding factor. Chambers has said that client feedback can count for even more than the work a firm describes in its submission. Researchers also look at legal skill, client service, business sense and value for money.
Big deals are not the only thing that impresses Chambers. A smaller matter that was complex, involved several countries or mattered a great deal to the client can count just as much.
A good fit for: firms with well-known partners, firms whose clients are happy to spend time talking to a researcher, and firms that can take part every year. Chambers notices when a firm skips a year.
IFLR1000: deals and finance
IFLR1000 is the most specialised of the three. It has covered the legal market for more than 30 years, but only in finance and corporate work: banking, capital markets, investment funds, mergers and acquisitions, private equity, project finance and restructuring. It does not rank litigation, arbitration, tax, employment or intellectual property.
For IFLR1000, the deals are what decide a ranking. Firms list the transactions they worked on, and researchers judge how complex, new and important those deals were, and how many of them there were. IFLR1000 also asks clients and other lawyers for their views, but it says good feedback alone will not get a firm ranked.
For the 2026 edition, IFLR1000 moved to a single online form, limited the number of lawyers a firm can put forward, and reduced the number of client referees to 15.
A good fit for: firms that work on a steady flow of finance or M&A deals, firms advising banks, investment funds and companies raising money, and firms in smaller markets where a few landmark deals can make a big difference.
What researchers expect today
In recent years, all three rankings have grown tired of marketing language. Saying a firm is "leading" or "market-renowned" no longer impresses anyone. Researchers want proof, and three things matter most.
Clear examples of real work. A firm should explain what each matter was, what its own lawyers did, why it was difficult and why it mattered. A few strong examples are better than a long list of routine ones.
International work. Deals and disputes that cross borders are becoming more common, and the rankings pay close attention to firms that handle them well.
Clients who are willing to talk. Client feedback now carries a lot of weight. It is better to choose a client who will pick up the phone and speak openly than a very senior one who is too busy to respond.
Where should a firm start?
A firm with a broad practice, a strong team or a specialist niche should start with The Legal 500. A firm with well-known partners and loyal clients will benefit most from Chambers. A firm focused on finance or deals should treat IFLR1000 as a must, usually alongside Chambers.
Most international firms take part in all three, but they write each submission differently. For The Legal 500, the submission shows off the team. For Chambers, it shows off the people and their clients. For IFLR1000, it is a record of deals. Whichever ranking a firm aims for, the firms that succeed take part every year, back up what they claim with evidence, and choose their client referees carefully.