›Summary
CMS is mapped by Sartori across 76 offices in 46 countries (Global footprint), headquartered in London. Headcount band: 4,000+ attorneys. Strongest mapped practices: Corporate & M&A, Real Estate, Employment & Labor. It appears in 14 Ranking Atlas pages. Profile compiled from public facts, last verified 23 Jul 2026.
01 — Public record
Facts on file
Compiled from public sources. Figures are shown as bands where exact counts are not published; nothing here is provided by the firm.
Website
Largest mapped office
London, GB
Professionals
4,000+ attorneys banded
Countries covered
46 via 76 offices
Office footprint — mapped metros
76 offices · 46 countriesPrincipal practices
Bold chips mark the firm’s deepest mapped practices (major or strong).
Seniority mix — banded, fee earners
≈1400 partners · 750 counsel · 2450+ associates
Mapped from public bios and firm pages; exact counts are not published, so figures are shown as approximate bands.
Sartori Firm Index — footprint (a different lens from the Atlas tiers)
Global · coverage 3 of 370.6
Composite SFI
SFI sub-index · banded
97.7
Scale
SFI sub-index · banded
71.9
Reach
SFI sub-index · banded
5.3
Hiring
SFI sub-index · banded
The Sartori Firm Index measures footprint and momentum (scale · reach · hiring), not practice quality. It never assigns an Atlas tier, and the Atlas never reuses this number — the two lenses are deliberately separate.
02 — Where this firm is ranked
Ranking Atlas & Firm Index
No composite firm score is published. Atlas tiers are assigned per market or practice from public footprint and evidence; the Firm Index leaderboards are a separate footprint lens.
17 listings · Atlas tiers apply only within their own market or practice
| Listing | Type | Tier | |
|---|---|---|---|
| Best law firms in United Kingdom | Atlas ranking | Market leaders | → |
| Best law firms in Brussels | Atlas ranking | Highly active | → |
| Best law firms in Germany | Atlas ranking | Market leaders | → |
| Best law firms in Hamburg | Atlas ranking | Market leaders | → |
| Best law firms in London | Atlas ranking | Market leaders | → |
| Best law firms in Luxembourg | Atlas ranking | Highly active | → |
| Best law firms in Italy | Atlas ranking | Highly active | → |
| Best law firms in Paris | Atlas ranking | Market leaders | → |
| Best law firms in Rome | Atlas ranking | Market leaders | → |
| Best law firms in Shanghai | Atlas ranking | Highly active | → |
| Best law firms in China | Atlas ranking | Established | → |
| Best law firms in Warsaw | Atlas ranking | Market leaders | → |
| Best law firms in Poland | Atlas ranking | Market leaders | → |
| Best law firms in Edinburgh | Atlas ranking | Highly active | → |
| Sartori Firm Index — overall | SFI leaderboard | — | → |
| Sartori Firm Index — United Kingdom | SFI leaderboard | — | → |
| Sartori Firm Index — hiring now | SFI leaderboard | — | → |
03 — Sources & verification Last verified 23 Jul 2026 · next review by 23 Aug 2026 · change log
Public sources
- 1 Law and tax firm in the United Kingdom | CMS UKfirm_website · 2026-07-21
- 2 Paris law firm | CMS Francis Lefebvre Avocatsfirm_website · 2026-07-21
- 3 CMS Warsaw | Poland | International law firm CMSfirm_website · 2026-07-21
- 4 CMS | Oslo | Norwayfirm_website · 2026-07-21
- 5 CMS | Lisbon | Portugalfirm_website · 2026-07-21
- 6 CMS | Rome | Italyfirm_website · 2026-07-21
- 7 Cannon Place | United Kingdom | International law firm CMSfirm_website · 2026-07-21
- 8 Paris law firm | CMS Francis Lefebvre Avocatsfirm_website · 2026-07-21
- 9 CMS Office Amsterdamfirm_website · 2026-07-21
- 10 CMS Warsaw | Poland | International law firm CMSfirm_website · 2026-07-21
- 11 Law and tax experts in Poland | International law firm CMSfirm_website · 2026-07-21
- 12 International Law Firm in Hamburg | CMS Germanyfirm_website · 2026-07-21
- 13 CMS Edinburgh | United Kingdom | International law firm CMSfirm_website · 2026-07-21
- 14 International Law Firm in Cologne | CMS Germanyfirm_website · 2026-07-21
- 15 CMS | Oslo | Norwayfirm_website · 2026-07-21
- 16 CMS | Lisbon | Portugalfirm_website · 2026-07-21
- 17 International Law Firm in Stuttgart | CMS Germanyfirm_website · 2026-07-21
- 18 CMS | Rome | Italyfirm_website · 2026-07-21
- 19 CMS | Sheffield | United Kingdomfirm_website · 2026-07-21
- 20 CMS Portugal advises Atlas Copco Group on the acquisition of LusoArfirm_website · 2026-07-21
Know the limits of this data
- —Figures are bands, not audited counts; public sources lag reality by weeks or months.
- —Atlas tiers are Sartori’s independent editorial opinion — not the firm’s claim, and not a client-satisfaction measure.
- —No firm-level numeric score exists; Atlas tiers apply only within their own market or practice.
- —No third-party legal-directory band is used as an input.
Corrections from the firm or its representatives are reviewed within five working days.
Change log
For candidates
Weighing a move to a firm like this?
A named consultant, a confidential read on the market, and evidence — not brochure copy — before you ever make an approach.
Speak confidentially →For law firms
Competing for the same talent?
We map this market daily. Retained search for partners, practice groups and senior associates, run with discretion.
Discuss a mandate →CMS is profiled here independently by Sartori. This page is not affiliated with, endorsed by, or produced in cooperation with the firm; firm names are used for identification only and no logo or brand assets are reproduced. Rankings reflect Sartori’s editorial methodology and public mapping — they are not legal advice, nor a recommendation to instruct counsel.