›Summary
Mayer Brown is mapped by Sartori across 21 offices in 10 countries (Global footprint), headquartered in Chicago. Headcount band: 1,500–2,500 attorneys. Strongest mapped practices: Finance & Banking, Litigation & Disputes, Corporate & M&A. It appears in 3 Ranking Atlas pages. Profile compiled from public facts, last verified 22 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
Chicago, US
Professionals
1,500–2,500 attorneys banded
Countries covered
10 via 21 offices
Office footprint — mapped metros
21 offices · 10 countriesPrincipal practices
Bold chips mark the firm’s deepest mapped practices (major or strong).
Seniority mix — banded, fee earners
≈750 partners · 300 counsel · 900+ 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 352.9
Composite SFI
SFI sub-index · banded
84.7
Scale
SFI sub-index · banded
37
Reach
SFI sub-index · banded
5.4
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.
5 listings · Atlas tiers apply only within their own market or practice
| Listing | Type | Tier | |
|---|---|---|---|
| Best law firms in United States | Atlas ranking | Highly active | → |
| Best law firms in Washington | Atlas ranking | Established | → |
| Best law firms in Chicago | Atlas ranking | Market leaders | → |
| Sartori Firm Index — overall | SFI leaderboard | — | → |
| Sartori Firm Index — United States | SFI leaderboard | — | → |
03 — Sources & verification Last verified 22 Jul 2026 · next review by 22 Aug 2026 · change log
Public sources
- 1 New York | Locations | Mayer Brownfirm_website · 2026-07-21
- 2 New York | Locations | Mayer Brownfirm_website · 2026-07-21
- 3 Mayer Brown expands and strengthens New York presence with major office expansion | News | Mayer Brownfirm_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
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Discuss a mandate →Mayer Brown 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.