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Practice × location ranking

Best Mergers & Acquisitions law firms in Tokyo

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 combining the opinions of practising lawyers — more than 10,000 lawyers interviewed — with monthly market surveys. As of July 2026, the best Mergers & Acquisitions law firms in Tokyo are: Nishimura & Asahi, Mori Hamada & Matsumoto, Nagashima Ohno & Tsunematsu, Anderson Mori & Tomotsune, Baker McKenzie, Skadden Arps, Bird & Bird, Davis Polk & Wardwell, Morgan Lewis, Norton Rose Fulbright, Paul Hastings, Simpson Thacher & Bartlett.

01 — The ranking

The Tokyo Mergers & Acquisitions board

A tier on this Tokyo Mergers & Acquisitions board names relative firm standing in words. Placement speaks to public takeovers, private M&A and strategic transaction mandate presence on Japan's corporate centre; order inside each band carries no hierarchy and is not a score.

TOKYO × MERGERS & ACQUISITIONS12 FIRMS · NO SCORESREV. 2026-07
REFFIRMTOKYO MERGERS & ACQUISITIONS BANDSIGNAL
TIER 1 — MARKET LEADERS1 FIRMS

The top editorial band for the best Mergers & Acquisitions law firms in Tokyo: firms that set the tone for takeover counsel, private equity buy- and sell-side mandates and strategic M&A at scale in Tokyo. Within-tier sequence rotates and is not a ranking.

T1·01 Nishimura & Asahi200–349 attorneys mapped · major local depth 200–349 ATTORNEYS FLAT → EVID ↓
TIER 2 — HIGHLY ACTIVE3 FIRMS

Highly active on the Tokyo Mergers & Acquisitions board means consistent public and private deal presence and peer recognition short of the leader set. No numeric score is assigned.

T2·01 Mori Hamada & Matsumoto100–199 attorneys mapped · major local depth 100–199 ATTORNEYS FLAT → EVID ↓
T2·02 Nagashima Ohno & Tsunematsu350+ attorneys mapped · major local depth 350+ ATTORNEYS FLAT → EVID ↓
T2·03 Anderson Mori & Tomotsune200–349 attorneys mapped · major local depth 200–349 ATTORNEYS FLAT → EVID ↓
TIER 3 — ESTABLISHED1 FIRMS

This band covers firms with solid Mergers & Acquisitions standing and mapped deal benches in Tokyo, without the intensity of the tiers above. Within-tier order is deliberately flat.

T3·01 Baker McKenzie25–49 attorneys mapped · major local depth 25–49 ATTORNEYS FLAT → EVID ↓
NOTABLE — NOTABLE IN THIS FIELD7 FIRMS · OUTSIDE THE TIERS

Notable in this field marks verified Mergers & Acquisitions presence in Tokyo below full tier depth — specialist or thinner deal benches kept visible on purpose, not scored into the main bands.

N·01 Skadden Arps5–9 attorneys mapped · thin local depth 5–9 ATTORNEYS FLAT → EVID ↓
N·02 Bird & Bird5–9 attorneys mapped · thin local depth 5–9 ATTORNEYS FLAT → EVID ↓
N·03 Davis Polk & Wardwell1–4 attorneys mapped · thin local depth 1–4 ATTORNEYS FLAT → EVID ↓
N·04 Morgan Lewis5–9 attorneys mapped · thin local depth 5–9 ATTORNEYS FLAT → EVID ↓
N·05 Norton Rose Fulbright1–4 attorneys mapped · thin local depth 1–4 ATTORNEYS FLAT → EVID ↓
N·06 Paul Hastings1–4 attorneys mapped · thin local depth 1–4 ATTORNEYS FLAT → EVID ↓
N·07 Simpson Thacher & Bartlett5–9 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 Tokyo?

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 →

Nishimura & Asahi

Nishimura & Asahi is placed in market leaders for Mergers & Acquisitions in Tokyo. Public mapping (banded): 200–349 attorneys, major local depth, ≈100 partners · 15 counsel · 200+ associates. Evidence gates — office (G1) PASS, local practice (G2) PASS, recent signal (G3) PASS. The placement carries no numeric score.

Strongest mapped work

Corporate & M&AFinance & BankingInternational & Cross-Border

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

10–24 firms earn a tier in Tokyo 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 Global Coverage | Nishimura & Asahifirm_website · G1 · 2026-07-21
  2. 2 Nishimura & Asahi — attorney bios & practice pagesfirm_website · G2 · 2026-07-21
  3. 3 Nishimura & Asahi — Tokyo news & announcementsfirm_website · G3 · 2026-07-21
  4. 4 Offices/Locations｜Mori Hamada & Matsumotofirm_website · G1 · 2026-07-21
  5. 5 Mori Hamada & Matsumoto — attorney bios & practice pagesfirm_website · G2 · 2026-07-21
  6. 6 Mori Hamada & Matsumoto — Tokyo news & announcementsfirm_website · G3 · 2026-07-21
  7. 7 Nagashima Ohno & Tsunematsu — Tokyo office pagesfirm_website · G1 · 2026-07-21
  8. 8 Tokyo | Locations | Nagashima Ohno & Tsunematsufirm_website · G2 · 2026-07-21
  9. 9 Nagashima Ohno & Tsunematsu — Tokyo news & announcementsfirm_website · G3 · 2026-07-21
  10. 10 Locations | Anderson Mori & Tomotsunefirm_website · G1 · 2026-07-21
  11. 11 Tokyo | Locations | Anderson Mori & Tomotsunefirm_website · G2 · 2026-07-21
  12. 12 Services | Anderson Mori & Tomotsunefirm_website · G2 · 2026-07-21
  13. 13 ALB Japan Law Awards 2026 | NEWS | Anderson Mori & Tomotsunefirm_website · G3 · 2026-07-21
  14. 14 Banking & Finance / Corporate Newsletter - Proposed Beneficial Shareholder Identification System in the Companies Act Reform Package | Insight | Anderson Mori & Tomotsunefirm_website · G3 · 2026-07-21
  15. 15 Baker McKenzie — Tokyo office pagesfirm_website · G1 · 2026-07-21
  16. 16 Japan | Locations | Baker McKenziefirm_website · G2 · 2026-07-21
  17. 17 Baker McKenzie — Tokyo news & announcementsfirm_website · G3 · 2026-07-21
23 Jul 2026 Scope-aware market-relative core assembled.
23 Jul 2026 17 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 Tokyo?

Who leads Mergers & Acquisitions in Tokyo? As of July 2026, Market leaders are Nishimura & Asahi. Sartori does not name a single number-one firm; the gap inside Tier 1 is treated as unmeasurable, and the wider board of 12 firms uses worded tiers only.

Is Nishimura & Asahi the best Mergers & Acquisitions law firm in Tokyo?

Nishimura & Asahi sits in Tier 1 — Market leaders — of Sartori's Tokyo Mergers & Acquisitions board as of July 2026, alongside . 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 Tokyo?

By mapped Tokyo bench, the largest firms on this board are Nagashima Ohno & Tsunematsu (350+ mapped lawyers each), followed by Nishimura & Asahi, Anderson Mori & Tomotsune (200–349). All counts are bands, never precise headcounts.

Which Mergers & Acquisitions teams are hiring in Tokyo?

As of July 2026, no firm on this board shows a public hiring signal in the mapping window. Live Tokyo 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 Tokyo bench depth, seniority mix and market standing set the reference point for the market. As of July 2026 that is Nishimura & Asahi. Within the tier no firm outranks another.

Which are the best law firms in Tokyo overall?

Sartori's overall Tokyo board groups 19 firms into editorial tiers; as of July 2026 its Tier 1 is Nishimura & Asahi, Anderson Mori & Tomotsune. See /firms/in/tokyo/.

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.