Direct answer & research summary
Simpson Thacher & Bartlett is a global-footprint law firm mapped by Sartori & Partners across 13 offices in 8 countries, headcount band 500–1,000 attorneys, Sartori Firm Index 55.8, last verified 22 Jul 2026. Sartori & Partners has completed 400+ placements since 2017 (230+ in-house), including 52 general counsel and chief legal officer searches, with a median of 11 weeks from brief to accepted offer. A NASDAQ-listed medtech in Boston accepted its successor general counsel in week 11, from a shortlist of four at day 24.
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
New York, US
Professionals
500–1,000 attorneys banded
Countries covered
8 via 13 offices
Office footprint — mapped metros
13 offices · 8 countriesPrincipal practices
Bold chips mark the firm’s deepest mapped practices (major or strong).
Seniority mix — banded, fee earners
≈450 partners · 150 counsel · 275+ 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 2 of 355.8
Composite SFI
SFI sub-index · banded
73.2
Scale
SFI sub-index · banded
31.5
Reach
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.
9 listings · Atlas tiers apply only within their own market or practice
| Listing | Type | Tier | |
|---|---|---|---|
| Best law firms in Hong Kong | Atlas ranking | Notable in this field | → |
| Best law firms in Luxembourg | Atlas ranking | Notable in this field | → |
| Best law firms in New York | Atlas ranking | Highly active | → |
| Best law firms in China | Atlas ranking | Notable in this field | → |
| Best law firms in Tokyo | Atlas ranking | Notable in this field | → |
| Best law firms in Beijing | Atlas ranking | Notable in this field | → |
| Best private equity law firms in New York | 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 Office | Simpson Thacher & Bartlett LLPfirm_website · 2026-07-20
- 2 New York Office | Simpson Thacher & Bartlett LLPfirm_website · 2026-07-20
- 3 Simpson Thacher & Bartlett — news & announcementsfirm_website · 2026-07-20
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 →Simpson Thacher & Bartlett 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.