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Practice × location ranking

Best Corporate & M&A 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 that blends practising-lawyer opinion — more than 10,000 lawyers interviewed — with monthly market surveys. As of July 2026, the Corporate & M&A firms on the Tokyo board are: Nishimura & Asahi, Nagashima Ohno & Tsunematsu, Anderson Mori & Tomotsune, Mori Hamada & Matsumoto, Baker McKenzie, Paul Hastings, Sidley Austin, Skadden Arps, Jones Day.

01 — The ranking

The Tokyo Corporate & M&A board

Use this page as a structured Corporate & M&A market map for Tokyo: 9 firms placed in worded bands that reflect deal flow, senior bench depth and peer standing as of July 2026. REF codes cite rows; they do not number them.

TOKYO × CORPORATE & M&A9 FIRMS · NO SCORESREV. 2026-07
REFFIRMTOKYO CORPORATE & M&A BANDSIGNAL
TIER 1 — MARKET LEADERS1 FIRMS

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

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

This tier marks firms that compete routinely for significant Tokyo Corporate & M&A work. Standing is expressed in words; monthly rotation does not imply rank.

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

Established on the Tokyo Corporate & M&A board signals proven M&A and corporate advisory presence and credible depth. Labels are words; monthly sequence is a locator, not a league position.

T3·01 Baker McKenzie25–49 attorneys mapped · major local depth 25–49 ATTORNEYS FLAT → EVID ↓
NOTABLE — NOTABLE IN THIS FIELD4 FIRMS · OUTSIDE THE TIERS

These firms sit outside the main Corporate & M&A tiers by design: confirmed on the Tokyo map, not assessed at the depth required for Market leaders through Established.

N·01 Paul Hastings1–4 attorneys mapped · thin local depth 1–4 ATTORNEYS FLAT → EVID ↓
N·02 Sidley Austin1–4 attorneys mapped · thin local depth 1–4 ATTORNEYS FLAT → EVID ↓
N·03 Skadden Arps5–9 attorneys mapped · thin local depth 5–9 ATTORNEYS FLAT → EVID ↓
N·04 Jones Day5–9 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 Corporate & M&A 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

5–9 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 Nagashima Ohno & Tsunematsu — Tokyo office pagesfirm_website · G1 · 2026-07-21
  5. 5 Tokyo | Locations | Nagashima Ohno & Tsunematsufirm_website · G2 · 2026-07-21
  6. 6 Nagashima Ohno & Tsunematsu — Tokyo news & announcementsfirm_website · G3 · 2026-07-21
  7. 7 Locations | Anderson Mori & Tomotsunefirm_website · G1 · 2026-07-21
  8. 8 Tokyo | Locations | Anderson Mori & Tomotsunefirm_website · G2 · 2026-07-21
  9. 9 Services | Anderson Mori & Tomotsunefirm_website · G2 · 2026-07-21
  10. 10 ALB Japan Law Awards 2026 | NEWS | Anderson Mori & Tomotsunefirm_website · G3 · 2026-07-21
  11. 11 Banking & Finance / Corporate Newsletter - Proposed Beneficial Shareholder Identification System in the Companies Act Reform Package | Insight | Anderson Mori & Tomotsunefirm_website · G3 · 2026-07-21
  12. 12 Offices/Locations｜Mori Hamada & Matsumotofirm_website · G1 · 2026-07-21
  13. 13 Mori Hamada & Matsumoto — attorney bios & practice pagesfirm_website · G2 · 2026-07-21
  14. 14 Mori Hamada & Matsumoto — Tokyo news & announcementsfirm_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 Corporate & M&A law firms in Tokyo?

Sartori's answer for the best Corporate & M&A law firms in Tokyo as of July 2026 starts with Market leaders: Nishimura & Asahi. The board then places the remaining firms among Highly active, Established and Notable bands — labels in words, never numeric ranks.

Is Nishimura & Asahi the best Corporate & M&A law firm in Tokyo?

Nishimura & Asahi sits in Tier 1 — Market leaders — of Sartori's Tokyo Corporate & M&A 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 Corporate & M&A 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 Corporate & M&A 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.