US firms dominated the M&A rankings in 2025, according to the latest data from the London Stock Exchange Group (LSEG), with Kirkland & Ellis and Latham & Watkins claiming the top spots for UK and global deals by value.
With 2025 the biggest year for global M&A in four years, and partners in London gearing up for a busy 2026 despite geopolitical instability, the LSEG data highlights the extent to which a small group of elite US players are eclipsing rivals on both sides of the Atlantic.
LSEG’s data tracked $4.6trn of deal activity globally throughout 2025 – a 49% increase on 2024, despite the volume of transactions dipping by 3% to 52,000, which represents a five-year low in deal numbers. Included in the haul were 68 megadeals worth more than $10bn apiece – double the number in 2024 and the strongest year for megadeals on record.
Global growth
LSEG Top Principal Advisers full-year 2025 by deal value
| Firm | Rank (last year) | Total deal value | Number of deals |
|---|---|---|---|
| Kirkland & Ellis | 1 (1) | $830bn | 745 |
| Latham & Watkins | 2 (2) | $719.7bn | 786 |
| Wachtell | 3 (7) | $652.9bn | 108 |
| Skadden | 4 (3) | $606.3bn | 231 |
| Freshfields | 5 (5) | $339.4bn | 237 |
| Cleary | 6 (6) | $322.3bn | 117 |
| Paul Weiss | 7 (4) | $318.8bn | 257 |
| Cravath | 8 (15) | $315.6bn | 58 |
| Gibson Dunn | 9 (11) | $280.8bn | 269 |
| Simpson Thacher | 10 (8) | $280.1bn | 225 |
Deal activity increased across the Americas, EMEA and APAC last year, but with US target M&A accounting for half of all deal making, the LSEG adviser rankings demonstrate the growing involvement of US firms.
Despite this, a handful of UK-origin firms claimed spots in the top principal adviser list globally, with Freshfields once again the top-performing non-US firm, working on 237 deals worth $339.4bn to hold onto its fifth place spot from last year’s rankings.
Freshfields was joined in the top 20 principal adviser value table by Clifford Chance, A&O Shearman, and Linklaters, in 12th, 15th, and 20th place respectively.
Kirkland retained its position at the head of the global value table – taking a principal adviser role on 745 deals worth a total of $829.9bn in 2025, with Latham holding onto second place after managing 786 transactions worth $719.7bn.
Both firms won roles on some of the biggest announced deals of the year, with Latham advising Paramount on its $103.56bn joint hostile bid for Warner Bros Discovery (WBD). The firm also served as primary counsel to Silver Lake on the acquisition of EA Sports by a consortium comprising Saudi Arabia’s Public Investment Fund (PIF), Silver Lake and Affinity for $49bn.
Kirkland meanwhile has been advising on Kimberly-Clark’s $50.62bn acquisition of Tylenol manufacturer Kenvue, as well as advising the consortium on the EA Sports deal.
Fellow US firms scoring well in the global primary adviser rankings include Wachtell advising on 108 deals worth $652.8bn to take third place and Skadden in fourth place with roles on 231 deals worth $606.3bn.
Other US firms in the top 10 include Cleary, Paul Weiss, Cravath, Gibson Dunn and Simpson Thacher.
Both Wachtell and Skadden have also been involved in the WBD deals, with Skadden working for Netflix on its $99.1bn bid, and Wachtell acting for WBD throughout.
As the only non-US firm in the top 10 global value table, Freshfields’ position as a serious M&A player in the US was secured through roles on a number of large mandates. Other UK firms seeing a significant boost in their position in the rankings include Clifford Chance and A&O Shearman, which climbed from 17th place to 12th and 23rd to 15th respectively.
Commenting on deal activity in 2025, Kate Cooper, a London M&A partner at Freshfields, described 2025 as ‘a year of two halves,’ following tumultuous policy decisions in the US at the start of 2025.
‘We saw boards feeling quite uncertain around that time about making commitments, either towards growth in the US or away from or to diversify into different areas or geographies. And that was quite challenging, I think, for most sectors to navigate through.’
She added: ‘The second half of the year, we’ve definitely seen more activity. I think right now, there’s probably quite a few processes that are beginning to ramp up with a view of next year in the first half.’
Looking at global deal activity by volume, Goodwin Procter leads the pack, working on 945 announced deals in 2025, totalling $123.6bn. This pushed DLA Piper into second place, with roles on 804 transactions worth $67.6bn. Latham came third by deal volume globally, closely followed by Kirkland, with Cooley rounding out the top five with roles on 557 deals reaching $108.6bn in value.
M&A in the UK, Europe and Asia-Pacific
LSEG Top Legal Advisers full-year 2025 – any UK involvement by deal value
| Firm | Rank (last year) | Total deal value | Number of deals |
|---|---|---|---|
| Latham & Watkins | 1 (1) | $86.3bn | 145 |
| Kirkland & Ellis | 2 (6) | $81.7bn | 85 |
| Linklaters | 3 (3) | $78.2bn | 65 |
| Freshfields | 4 (5) | $63.8bn | 66 |
| Clifford Chance | 5 (12) | $54bn | 68 |
| White & Case | 6 (20) | $53.6bn | 77 |
| Slaughter and May | 7 (2) | $52.9bn | 50 |
| A&O Shearman | 8 (14) | $47.9bn | 85 |
| Debevoise & Plimpton | 9 (16) | $47.9bn | 21 |
| Simpson Thacher | 10 (22) | $36bn | 39 |
Looking at the UK and Europe, US firms were similarly dominant in the value rankings, with Latham coming top in the UK and second in EMEA by deal value, working on 145 deals worth $86.3bn in the UK and 306 deals in EMEA worth $200.46bn.
Kirkland placed second in the UK, working on $81.7bn worth of deals – this reflects a significant jump on 2024 when it came sixth by value.
Magic circle firms make up the rest of the UK top five, with Linklaters taking third place after handling 65 deals worth $78.2bn, followed by Freshfields, with 66 deals worth $63.8bn and Clifford Chance, which worked on 68 transactions worth $54bn.
Charlie Turner, a Linklaters corporate partner who advised on the $9.2bn Magnum Ice Cream company spin out from Unilever and IPO, predicts that there will be more carveouts in 2026.
‘I think we’re going to see more companies reviewing their businesses and considering carveouts and divestments, as they continue to drive value through the disposal of non-core assets,’ he said.
He added: ‘Carveouts can be a good news story. Companies divest themselves of non-core businesses to allow them to become more streamlined and focused, helping to support and drive greater performance in the remaining business whilst generating returns for shareholders or reinvestment. For a buyer, the carved-out business can offer real opportunity to create value. It can be win-win.’
Over at White & Case, which came sixth in the UK rankings, Patrick Sarch said: ‘We’ve seen more competitive situations in 2024 and 2025 than in any year since 2016, pointing to a sustained period of heightened competition between bidders.’
Across Europe, Freshfields worked on the highest value of deals, advising on 190 transactions totalling $247.58bn.
Latham is the second best performer in the region, with A&O Shearman and Clifford Chance featuring in third and fourth respectively, and Kirkland taking the fifth spot.
Meanwhile in APAC, Linklaters is the top performing British firm, placing second on the highest valued deals announced in the region last year. Acting on 50 transactions valued at $71.7bn, Linklaters’ performance is superseded only by Hong Kong-headquartered King & Wood Mallesons, which worked on 149 deals totalling $98.88bn.
HSF Kramer and Clifford Chance also made it into the top 10 in the APAC rankings, placing sixth and tenth respectively.
In the latter end of the table, Kirkland placed 13th, Ashurst, soon to be merging with US firm Perkins Coie, jumped to 17th from 40th, and Freshfields placed 20th.
Latham was just outside the top 20 in APAC, ranked 22nd – down from first in 2024.
LSEG Top Legal Advisers full-year 2025 – any European involvement by deal value
| Firm | Rank (last year) | Total deal value | Number of deals |
|---|---|---|---|
| Freshfields | 1 (1) | $247.6bn | 190 |
| Latham & Watkins | 2 (2) | $200.5bn | 306 |
| A&O Shearman | 3 (11) | $186.4bn | 238 |
| Clifford Chance | 4 (10) | $153.5bn | 220 |
| Kirkland & Ellis | 5 (5) | $151.6bn | 162 |
| Skadden | 6 (4) | $136.5bn | 97 |
| Linklaters | 7 (3) | $126.4bn | 192 |
| Sullivan & Cromwell | 8 (7) | $116.7bn | 55 |
| White & Case | 9 (6) | $114.5bn | 256 |
| Cleary | 10 (8) | $93.8bn | 74 |

Slaughter and May corporate and M&A co-head Simon Nicholls (pictured) also has faith in the strength of markets going into the new year, saying: ‘There’s a lot of assets looking for a home, and you need to find homes for them.’
One area partners all agree is not in any danger of slowing down is the technology sector, and the data underlines this, with global tech M&A values up 66% to $1.08trn, making it the top-performing sector by some distance.
Regardless of how the market shapes up, it’s clear that partners are excited for the year ahead.
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Allen & Overy and Shearman & Sterling, 2024
McDermott Will & Emery and Schulte Roth & Zabel, 2025
Ashurst and Perkins Coie, 2025
Clifford Chance, Rogers & Wells and Punder Volhard Weber & Axster, 2000
Norton Rose and Fulbright & Jaworski, 2013
Hogan & Hartson and Lovells, 2010
DLA, Piper Rudnick and Gray Cary Ware & Freidenrich, 2005
Dentons and Dacheng, 2015
CMS, Nabarro and Olswang, 2016
Herbert Smith and Freehills, 2012
King & Wood Mallesons and SJ Berwin, 2013
Honorable mentions