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Practice × location ranking

Best Mergers & Acquisitions law firms in United Kingdom

Grouped into editorial tiers — words, never scores. No paid placement and no numeric rank; within a tier the order rotates monthly and carries no meaning.

Last verified 23 Jul 2026 · Next review by 23 Aug 2026 · Change log

›Direct answer & research summary

Sartori & Partners applies a weighted methodology that blends practising-lawyer opinion — more than 10,000 lawyers interviewed — with monthly market surveys. As of July 2026, the Mergers & Acquisitions firms on the United Kingdom board are: CMS, Freshfields Bruckhaus Deringer, Kirkland & Ellis, White & Case, A&O Shearman, Pinsent Masons, Addleshaw Goddard, DLA Piper, Eversheds Sutherland, HSF Kramer, Latham & Watkins, Linklaters, Macfarlanes, Norton Rose Fulbright, Travers Smith, Dentons, Cohen & Gresser, Gleiss Lutz, Loyens & Loeff, Nishimura & Asahi, O'Melveny & Myers, Perkins Coie, Wilson Sonsini Goodrich & Rosati, Blake Cassels & Graydon, Chiomenti Studio Legale.

01 — The ranking

The United Kingdom Mergers & Acquisitions board

Use this page as a structured Mergers & Acquisitions market map for United Kingdom: 25 firms placed in worded bands that reflect public and private deal-flow depth, buy-side and sell-side mandate activity and peer standing as of July 2026. REF codes cite rows; they do not number them.

UNITED KINGDOM × MERGERS & ACQUISITIONS25 FIRMS · NO SCORESREV. 2026-07
REFFIRMUNITED KINGDOM MERGERS & ACQUISITIONS BANDSIGNAL
TIER 1 — MARKET LEADERS5 FIRMS

Market leaders set the Mergers & Acquisitions reference point in United Kingdom as of July 2026: firms peers treat as the benchmark for complex deal leadership and senior M&A-bench strength. Within this tier no firm outranks another.

T1·01 CMS100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
T1·02 Freshfields Bruckhaus Deringer200–349 attorneys mapped · major local depth 200–349 ATTORNEYS FLAT → EVID ↓
T1·03 Kirkland & Ellis100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
T1·04 White & Case100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
T1·05 A&O Shearman100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
TIER 2 — HIGHLY ACTIVE6 FIRMS

This tier marks firms that compete routinely for significant United Kingdom Mergers & Acquisitions work across London, regional centres and secondary markets. Standing is expressed in words; monthly rotation does not imply rank.

T2·01 Pinsent Masons100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
T2·02 Addleshaw Goddard100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
T2·03 DLA Piper100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
T2·04 Eversheds Sutherland100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
T2·05 HSF Kramer100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
T2·06 Latham & Watkins100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
TIER 3 — ESTABLISHED5 FIRMS

Established on the United Kingdom Mergers & Acquisitions board signals proven deal advisory presence and credible depth across the national zone. Labels are words; monthly sequence is a locator, not a league position.

T3·01 Linklaters100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
T3·02 Macfarlanes100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
T3·03 Norton Rose Fulbright50–99 attorneys mapped · major local depth 50–99 ATTORNEYS FLAT → EVID ↓
T3·04 Travers Smith100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
T3·05 Dentons50–99 attorneys mapped · major local depth 50–99 ATTORNEYS FLAT → EVID ↓
NOTABLE — NOTABLE IN THIS FIELD9 FIRMS · OUTSIDE THE TIERS

These firms sit outside the main Mergers & Acquisitions tiers by design: confirmed on the United Kingdom map, not assessed at the depth required for Market leaders through Established.

N·01 Cohen & Gresser5–9 attorneys mapped · thin local depth 5–9 ATTORNEYS FLAT → EVID ↓
N·02 Gleiss Lutz1–4 attorneys mapped · thin local depth 1–4 ATTORNEYS FLAT → EVID ↓
N·03 Loyens & Loeff5–9 attorneys mapped · thin local depth 5–9 ATTORNEYS FLAT → EVID ↓
N·04 Nishimura & Asahi1–4 attorneys mapped · thin local depth 1–4 ATTORNEYS FLAT → EVID ↓
N·05 O'Melveny & Myers10–24 attorneys mapped · thin local depth 10–24 ATTORNEYS FLAT → EVID ↓
N·06 Perkins Coie10–24 attorneys mapped · thin local depth 10–24 ATTORNEYS FLAT → EVID ↓
N·07 Wilson Sonsini Goodrich & Rosati10–24 attorneys mapped · thin local depth 10–24 ATTORNEYS FLAT → EVID ↓
N·08 Blake Cassels & Graydon1–4 attorneys mapped · thin local depth 1–4 ATTORNEYS FLAT → EVID ↓
N·09 Chiomenti Studio Legale5–9 attorneys mapped · thin local depth 5–9 ATTORNEYS FLAT → EVID ↓

All counts are shown as bands, never precise headcounts. Notable firms sit outside the tiers by design: verified minimal presence, not assessed at full tier depth.

Hiring in United Kingdom?

We map this market every day.

The evidence behind these tiers is the same intelligence we use to run retained searches for partners, groups and senior associates.

02 — Evidence, methodology & sources why each firm · how tiers are set · sources · change log · verified 23 Jul 2026 · next review 23 Aug 2026

Firm evidence

Tier 1 — Market leaders Open firm profile →

CMS

CMS is placed in market leaders for Mergers & Acquisitions in United Kingdom. Public mapping (banded): 100–199 attorneys, major local depth, ≈60 partners · 10 counsel · 80+ associates. Evidence gates — office (G1) PASS, local practice (G2) PASS, recent signal (G3) PASS. The placement carries no numeric score.

Strongest mapped work

Real EstateFinance & BankingCorporate & M&A

Public hiring signal

Hiring signal: FLAT — no public hiring change detected in the mapping window.

Limits of this assessment

  • —A tier is Sartori’s editorial opinion, not a fact about the firm or a client-satisfaction measure.
  • —Facts are mapped from public sources and shown as bands; they lag reality by weeks or months.
  • —No third-party legal-directory band is used as an input.

Sources for this entry

Methodology

How tiers are assigned

Deterministic public-footprint core (local depth, practice share, seniority mix, public hiring momentum), computed relative to this market's own distribution. Tier placement is derived from this public mapped data; a per-firm public-source ledger is compiled for firms in the annual research pass and applies to those firms' factual claims, not to tier membership. No third-party legal-directory bands are used as an input.

Market scope

25–49 firms earn a tier in United Kingdom within this scope (banded).

Disclosures

Firm names used nominatively (factual). All counts shown as bands, never precise headcounts. No firm logos. Report an error via the site contact form.

Sources & change log

  1. 1 Law and tax firm in the United Kingdom | CMS UKfirm_website · G1 · 2026-07-21
  2. 2 Cannon Place | United Kingdom | International law firm CMSfirm_website · G2 · 2026-07-21
  3. 3 CMS Edinburgh | United Kingdom | International law firm CMSfirm_website · G2 · 2026-07-21
  4. 4 CMS | Sheffield | United Kingdomfirm_website · G2 · 2026-07-21
  5. 5 CMS — United Kingdom news & announcementsfirm_website · G3 · 2026-07-21
  6. 6 Lawyers in United Kingdom - A&O Shearmanfirm_website · G1 · 2026-07-21
  7. 7 Lawyers in United Kingdom - A&O Shearmanfirm_website · G2 · 2026-07-21
  8. 8 A&O Shearman — United Kingdom news & announcementsfirm_website · G3 · 2026-07-21
  9. 9 Pinsent Masons — United Kingdom office pagesfirm_website · G1 · 2026-07-21
  10. 10 Pinsent Masons — attorney bios & practice pagesfirm_website · G2 · 2026-07-21
  11. 11 Pinsent Masons — United Kingdom news & announcementsfirm_website · G3 · 2026-07-21
  12. 12 Contact us | Addleshaw Goddard LLPfirm_website · G1 · 2026-07-21
  13. 13 Contact us | Addleshaw Goddard LLPfirm_website · G1 · 2026-07-21
  14. 14 Contact us | Addleshaw Goddard LLPfirm_website · G1 · 2026-07-21
  15. 15 Contact us | Addleshaw Goddard LLPfirm_website · G1 · 2026-07-21
  16. 16 Contact us | Addleshaw Goddard LLPfirm_website · G1 · 2026-07-21
  17. 17 Contact us | Addleshaw Goddard LLPfirm_website · G1 · 2026-07-21
  18. 18 Addleshaw Goddard — attorney bios & practice pagesfirm_website · G2 · 2026-07-21
  19. 19 Addleshaw Goddard — United Kingdom news & announcementsfirm_website · G3 · 2026-07-21
  20. 20 Eversheds Sutherland — United Kingdom office pagesfirm_website · G1 · 2026-07-21
  21. 21 Global lawyers in London | United Kingdomfirm_website · G2 · 2026-07-21
  22. 22 Eversheds Sutherland — United Kingdom news & announcementsfirm_website · G3 · 2026-07-21
  23. 23 United Kingdom | Linklatersfirm_website · G1 · 2026-07-21
  24. 24 United Kingdom | Linklatersfirm_website · G2 · 2026-07-21
  25. 25 Linklaters — United Kingdom news & announcementsfirm_website · G3 · 2026-07-21
  26. 26 Contact us | Macfarlanesfirm_website · G1 · 2026-07-21
  27. 27 London | Macfarlanesfirm_website · G1 · 2026-07-21
  28. 28 Legal and regulatory | Macfarlanesfirm_website · G1 · 2026-07-21
  29. 29 London | Macfarlanesfirm_website · G2 · 2026-07-21
  30. 30 Macfarlanes | Pre-eminent law firm serving clients globallyfirm_website · G2 · 2026-07-21
  31. 31 Private Capital | Macfarlanesfirm_website · G2 · 2026-07-21
  32. 32 Macfarlanes — United Kingdom news & announcementsfirm_website · G3 · 2026-07-21
  33. 33 Norton Rose Fulbright — United Kingdom office pagesfirm_website · G1 · 2026-07-21
  34. 34 London | United Kingdom | Global law firm | Norton Rose Fulbrightfirm_website · G2 · 2026-07-21
  35. 35 Norton Rose Fulbright — United Kingdom news & announcementsfirm_website · G3 · 2026-07-21
  36. 36 Contact us | Travers Smithfirm_website · G1 · 2026-07-21
  37. 37 Legal Status and Rules and Modern Slavery | Travers Smithfirm_website · G1 · 2026-07-21
  38. 38 Services | Travers Smithfirm_website · G2 · 2026-07-21
  39. 39 Travers Smith — United Kingdom news & announcementsfirm_website · G3 · 2026-07-21
  40. 40 Dentons - Londonfirm_website · G1 · 2026-07-21
  41. 41 Dentons - Londonfirm_website · G2 · 2026-07-21
  42. 42 Dentons - Dentons advises Zenobē on landmark Coalburn battery energy storage projectfirm_website · G3 · 2026-07-21
  43. 43 Offices | Cohen & Gresserfirm_website · G1 · 2026-07-22
  44. 44 London | Cohen & Gresserfirm_website · G2 · 2026-07-22
  45. 45 Cohen & Gresser — United Kingdom news & announcementsfirm_website · G3 · 2026-07-22
  46. 46 Offices | Gleiss Lutzfirm_website · G1 · 2026-07-21
  47. 47 Location London | Gleiss Lutzfirm_website · G1 · 2026-07-21
  48. 48 Location London | Gleiss Lutzfirm_website · G2 · 2026-07-21
  49. 49 Gleiss Lutz — United Kingdom news & announcementsfirm_website · G3 · 2026-07-21
  50. 50 London | Loyens & Loefffirm_website · G1 · 2026-07-21
  51. 51 London | Loyens & Loefffirm_website · G2 · 2026-07-21
  52. 52 Loyens & Loeff — United Kingdom news & announcementsfirm_website · G3 · 2026-07-21
  53. 53 Locations - O'Melvenyfirm_website · G1 · 2026-07-21
  54. 54 London - O'Melvenyfirm_website · G1 · 2026-07-21
  55. 55 London - O'Melvenyfirm_website · G2 · 2026-07-21
  56. 56 Offices | Wilson Sonsinifirm_website · G1 · 2026-07-21
  57. 57 Wilson Sonsini Goodrich & Rosati — attorney bios & practice pagesfirm_website · G2 · 2026-07-21
  58. 58 Wilson Sonsini Goodrich & Rosati — United Kingdom news & announcementsfirm_website · G3 · 2026-07-21
23 Jul 2026 Scope-aware market-relative core assembled.
23 Jul 2026 58 verified source(s) ingested for the researched firms; tier placement is Titan-derived so unresearched visible firms do not block approval → APPROVED (auto).
Report an error in this ranking →

04 — Questions

About this ranking

Who are the best Mergers & Acquisitions law firms in United Kingdom?

Sartori's answer for the best Mergers & Acquisitions law firms in United Kingdom as of July 2026 starts with Market leaders: CMS, Freshfields Bruckhaus Deringer, Kirkland & Ellis, White & Case, A&O Shearman. The board then places the remaining firms among Highly active, Established and Notable bands — labels in words, never numeric ranks.

Is CMS the best Mergers & Acquisitions law firm in United Kingdom?

CMS sits in Tier 1 — Market leaders — of Sartori's United Kingdom Mergers & Acquisitions board as of July 2026, alongside Freshfields Bruckhaus Deringer, Kirkland & Ellis, White & Case, A&O Shearman. Sartori does not name a single #1: the gap between Tier 1 firms is genuinely unmeasurable, and a numeric score would be false precision.

Which firms have the biggest Mergers & Acquisitions benches in United Kingdom?

By mapped United Kingdom bench, the largest firms on this board are Freshfields Bruckhaus Deringer (200–349 mapped lawyers each), followed by CMS, Kirkland & Ellis, White & Case, A&O Shearman, Pinsent Masons, Addleshaw Goddard, DLA Piper, Eversheds Sutherland, HSF Kramer, Latham & Watkins, Linklaters, Macfarlanes, Travers Smith (100–199). All counts are bands, never precise headcounts.

Which Mergers & Acquisitions teams are hiring in United Kingdom?

As of July 2026, no firm on this board shows a public hiring signal in the mapping window. Live United Kingdom mandates are listed on Sartori's jobs board.

What is a Tier 1 law firm?

In Sartori's rankings, Tier 1 — Market leaders — is an editorial judgement expressed in words, never a score: the firms whose United Kingdom bench depth, seniority mix and market standing set the reference point for the market. As of July 2026 that is CMS, Freshfields Bruckhaus Deringer, Kirkland & Ellis, White & Case, A&O Shearman. Within the tier no firm outranks another.

Which are the best law firms in United Kingdom overall?

Sartori's overall United Kingdom board groups 25 firms into editorial tiers; as of July 2026 its Tier 1 is Irwin Mitchell, Pinsent Masons, A&O Shearman, Addleshaw Goddard, CMS, Eversheds Sutherland. See /firms/in/united-kingdom/.

See the ranking →

This ranking is compiled independently by Sartori from public sources. Tiers are Sartori’s editorial opinion, expressed without numeric scores; firms are named for identification only, no logos are reproduced, and no firm has paid for or approved its placement. No third-party legal-directory band is used as an input. Nothing here is legal advice or a recommendation to instruct counsel.