International Arbitration Laterals 2026: London, Then the Seats

International arbitration lateral moves follow a map of their own. Sartori & Partners data show that London received 28.4% of the 162 arbitration and public international law moves recorded in the 12 months to October 2026. Across all practices, London took 9.2%. That puts arbitration's London index at 307, far above what its share of the whole market would predict. For a firm building or rebuilding an arbitration bench, the first question is not which US office to staff but how to compete for people in London and in the handful of seats that follow it.

London is the only city with enough arbitration arrivals in the past 12 months to report on its own: 46 moves. The comparison with the neighboring disputes practices shows how unusual that is. Litigation and disputes sent 4.3% of its moves to London, an index of 47. Construction sent 6.8%, an index of 74. Both sit under the market's London share; arbitration sits at 307. London is also the city arbitration lawyers most often leave: it accounts for 24.1% of the moves where the old city is known. The talent circulates inside one city more than it flows into it from elsewhere.

The consequence for a hiring firm is plain. A London arbitration search competes with every firm that keeps a disputes floor there, and the candidate pool is largely lawyers already sitting in competitors' London offices. A firm without a London arbitration presence is recruiting into the market's busiest corner from a standing start.

Below London, a single year is too thin to rank cities, so the three-year view carries the comparison. In the Sartori & Partners lateral database, London took 30.9% of the 489 arbitration moves over three years. Paris and New York followed at 7.8% each, then Singapore at 7.2%, Dubai at 6.3%, Washington at 4.9% and Hong Kong at 4.3%.

Set against the whole market, the pattern sharpens. Paris holds 2.3% of all lateral moves over three years, so its arbitration share is 3.4 times its market weight. New York goes the other way: it takes 14.2% of all moves but only 7.8% of arbitration moves. Washington sits close to its market share. Singapore, Dubai and Hong Kong do not appear in the market's own three-year city list at all, yet each one carries a visible share of arbitration hiring.

For a firm, this is the shortlist of seats where an arbitration bench is hired and rebuilt. A New York arbitration team is a smaller recruiting market than New York's size suggests; a Paris, Singapore or Dubai search draws on a pool that is deep for the practice even though those cities are small in the overall lateral market.

Among moves where both cities are known, 24.8% of arbitration lawyers also changed city, against 20.5% for all practices, a gap of 4.3 points. The three-year figure is 26.1%, so this is a steady trait rather than one year's noise. The disputes neighbors relocate less: 19.6% in litigation and 21.9% in construction.

Team moves stand out further. Sartori & Partners counts 7.4% of arbitration moves as part of a team joining the same firm in the same quarter, against 1.5% across the market, or 4.9 times the market rate. Litigation sits at 2.0% and construction at 0.7%. Arbitration practices are built around case teams that follow a partner, and the data show it. A firm opening a new seat should plan for a group hire, with the pricing and conflict work that brings, rather than a string of individual offers.

On the settled 12-month windows, arbitration hiring held flat (+12.8%): 168 moves against 149 a year earlier. On counts this small, that gap is inside the noise. All lateral moves rose 9.0% over the same windows, from 13,128 to 14,305. Partner hiring in arbitration held flat (+15.7%) as well.

The mix is more senior than the market's. Partners made up 35.8% of arbitration moves in 12 months, against 27.7% across all practices; associates were 46.3%, against 58.5%. A firm that wants arbitration associates is fishing in a smaller pond than the headline volume suggests, and should expect to grow them rather than buy them.

Only 76 firms hired an arbitration lawyer in the past 12 months, and the ten most active took 40.3% of the moves. Across the market the top 10 take 12.9%. Firms of 1,000+ lawyers received 71.4% of arbitration moves, against 53.6% market-wide. The practice overlaps heavily with its neighbors: 54.9% of these moves were also recorded under litigation and 29.0% under construction.

The firms on this list are the ones a hiring firm meets in every London and seat-city search. Their candidates know each other's offers, and a mandate here is priced against a short set of competing bids.

Start in London. With 28.4% of 12-month arbitration moves, it is where the volume is and where the competing offers are made. A London search should be built around the candidates in rival London disputes groups, with a realistic view that a good arbitration partner may bring a team.

Plan the second seat on three years of evidence, not one. Paris, Singapore, Dubai and Hong Kong each hold an arbitration share that the city's place in the wider market would not predict. New York holds only 7.8% of arbitration moves over three years, so a US-first expansion plan for this practice starts in the thinner pool.

Budget for relocation and for teams. With 24.8% of movers changing city and team moves at 7.4%, offers in this practice more often include a move package and a plan for associates who arrive with a partner. Do not count on a rising tide: arbitration volume is flat while the market grew, so every hire is taken from a competitor's bench.