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Private company

May & Baker

British chemical company

May & Baker was a British chemical company founded by John May and William Gerrard Baker in Wandsworth, London in 1839. They initially specialized in the manufacture of chemicals derived from mercury and bismuth.2 It is headquartered in Guildford, United Kingdom.1 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

1851Founded1
  • HeadquartersGuildford, United Kingdom1
  • Legal formprivate company limited by shares1
  • LEI549300EV4SSYXYXPFX383
  • StatusActive3
  • LEI statusLapsed (not renewed)3
  • Registered addressONE, GU1 4YS Guildford, United Kingdom3
  • Registered withCompanies House, 024503613

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Original laboratory sample of 'M and B 693', England, 1938 Wellcome L0059012
Photo: https://wellcomeimages.org/indexplus/obf_images/8d/43/ac00849436dacc6d2b2789ac039e.jpg Gallery: https://wellcomeimages.org/indexplus/image/L0059012.html Wellcome Collection gallery (2018-03-31): https://wellcomecollection.org/works/e9qqsah9 CC-BY-4.0, CC BY 4.0, via Wikimedia Commons4

May & Baker was a British chemical company founded by John May and William Gerrard Baker in Wandsworth, London in 1839. They initially specialized in the manufacture of chemicals derived from mercury and bismuth.2

Corporate structure

May & Baker is part of a group headed by Sanofi. 124 entities, 30 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

  • Sanofi Paris, France
    • Hoechst 100% · Frankfurt am Main, Germany
    • Ablynx Ghent, Belgium
    • Sanofi (Belgium) Machelen, Belgium
    • Chattem Subsidiary · 100% · Chattanooga
    • Genzyme Subsidiary · 100% · Cambridge, Massachusetts, United States
      • GENZYME THERAPEUTIC PRODUCTS LIMITED PARTNERSHIP Subsidiary · Boston, Massachusetts, United States
    • Sanofi-Aventis Korea Subsidiary · 100% · Seoul, South Korea
    • Shantha Biotechnics Subsidiary · 98.7% · Medchal
    • Bioverativ Subsidiary · Waltham
    • Sanofi (Japan) Subsidiary · Tokyo, Japan
    • Sanofi Medley Subsidiary · Campinas, Brazil
    • Winthrop Subsidiary · United Kingdom
    • Zentiva Subsidiary · Praha 10, Czechia
    • Infraserv Höchst Stake · 31.2% · Frankfurt am Main, Germany
    • Regeneron Pharmaceuticals Stake · 22.2% · Tarrytown, New York, United States
      • Checkmate Pharmaceuticals, Inc. Subsidiary · Delaware, United States
      • Decibel Therapeutics, Inc. Subsidiary · Delaware, United States
      • Eastside Campus Holdings LLC Subsidiary · New York, United States
      • Loop Road Holdings LLC Subsidiary · New York, United States
      • Old Saw Mill Holdings LLC Subsidiary · New York, United States
      • Oxular Acquisitions Limited Subsidiary · United Kingdom
      • Oxular Inc. Subsidiary · Delaware, United States
      • Regeneron Assurance, Inc. Subsidiary · New York, United States
      • Regeneron Austria GmbH Subsidiary · Austria
      • Regeneron Belgium SRL Subsidiary · Belgium
      • Regeneron Canada Company Subsidiary · Canada
      • Regeneron Clinical Genomics Laboratory LLC Subsidiary · Delaware, United States
      • Regeneron France SAS Subsidiary · France
      • Regeneron Genetics Center LLC Subsidiary · Delaware, United States
      • Regeneron GmbH Subsidiary · Germany
      • Regeneron Healthcare Solutions, Inc. Subsidiary · New York, United States
      • Regeneron India Private Limited Subsidiary · India
      • Regeneron International Holdings LLC Subsidiary · Delaware, United States
      • REGENERON IRELAND DESIGNATED ACTIVITY COMPANY Subsidiary · Dublin, Ireland
      • Regeneron Italy S.r.l. Subsidiary · Italy
      • Regeneron Japan KK Subsidiary · Japan
      • Regeneron NL B.V. Subsidiary · Netherlands
      • Regeneron Spain, S.L.U. Subsidiary · Spain
      • Regeneron Switzerland GmbH Subsidiary · Switzerland
      • Regeneron UK Limited Subsidiary · United Kingdom
      • and 4 more
    • SANOFI AVENTIS SA Subsidiary · 100% · Barcelona, Spain
    • SANOFI PASTEUR SA DE CV Subsidiary · 100% · Mexico City, Mexico
    • AZTECA VACUNAS SA DE CV Subsidiary · Mexico City, Mexico
    • Carraig Insurance Designated Activity Company Subsidiary · Dublin, Ireland
    • CHINOIN GYÓGYSZER-ÉS VEGYÉSZETI TERMÉKEK GYÁRA ZÁRTKÖRŰEN MŰKÖDŐ RT. Subsidiary · Budapest, Hungary
      • SANOFI-AVENTIS MAGYARORSZÁG KERESKEDELMI ÉS SZOLGÁLTATÓ ZÁRTKÖRŰEN MŰKÖDŐ RÉSZVÉNYTÁRSASÁG Subsidiary · Budapest, Hungary
    • GENZYME FLANDERS Subsidiary · Geel, Belgium
    • Genzyme Global S.a r.l. (Genzyme Global S.à r.l.) Subsidiary · Baar, Switzerland
    • HELVEPHARM AG Subsidiary · Vernier, Switzerland
    • Life Science Holdings Inc. Subsidiary · Swiftwater, Pennsylvania, United States
    • Nattermann Verwaltungs GmbH Subsidiary · Frankfurt am Main, Germany
    • Opella Subsidiary · France
    • and 39 more

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries listed in Exhibit 21 of annual reports filed with the SEC; subsidiaries, stakes and holdings from Wikidata (CC0). Each entity in the chart links to its source.

Subsidiaries and ownership

Parent company (GLEIF)

Ultimate parent

Ownership links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); each one cites its LEI record.

Timeline

  1. Dec 8, 2017Parent Directly consolidated by SANOFI-AVENTIS UK HOLDINGS LIMITED3
  2. 1851Founded Founded1

Sources

The numbers on this page point here. Each one links to the record it came from.

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