WHO OWNS SIGMA ALDRICH FULL
Following the takeover of Alfa, the combined business was rebranded Alfa-Aesar, rationalised on the Aesar location at Ward Hill, and Johnson-Matthey assumed full ownership. Aesar had no manufacturing or bottling facilities, being simply a distribution centre. This was Johnson Matthey's part-owned USA distribution agent for their range of high purity inorganics. Royston had manufacturing and machining equipment for high purity metal foils, powders, ribbons and salts. This was operated from their facility at Royston, Hertfordshire U.K. Johnson-Matthey had two distinct research chemical catalogues, one of high purity inorganic chemicals and metals, the other a (short-lived) range of inorganic reagents, solvents and acids. Thiokol eventually tired of the non-mainstream business and sold it to Aesar, who closed the USA site and relocated the business to the Aesar location. The USA and European operations used different (though similar) catalogues, with completely different product number sequences and appear to have been run with a high degree of independence from each other. The European sales office was in Karlsruhe, Germany.
In Europe, the business was branded as Alfa-Ventron (to distinguish it from the UK company Alfa Chemicals) and also later sold a limited range of organic chemicals sourced from Lancaster Synthesis. In the USA the business was branded as Alfa, and sold only inorganics. Following the amalgamation of Aldrich and the Sigma Chemical Co, the joint venture was terminated with Alfa reverting to Metal Hydrides ownership (later Ventron, later again Thiokol). It was created to market inorganics, organometallics, and others such as organoboron and organoarsenic reagents. The purpose was to provide a source of inorganic research chemicals to sit alongside the organic chemicals of Bader's other company: Aldrich Chemicals.
WHO OWNS SIGMA ALDRICH SERIES
The current Alfa Aesar setup - part of the Johnson Matthey Fine Chemicals & Catalysts Division - comes from a series of company mergers: They have facilities in many countries and manufacture many of the chemicals they sell. 42☄5′54″N 71☀6′58″W / 42.765°N 71.116°W / 42.765 -71.116 Alfa Aesar, headquartered in Ward Hill, Massachusetts, United States, is a supplier of reagents and materials for use in research and development, and analysis.
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