Sigma-Aldrich
A global life-science brand supplying chemical reagents, biological products, laboratory materials, and research services.
Last updated August 31, 2026
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Overview
Sigma-Aldrich is a global life-science and specialty-chemicals brand whose products support academic research, pharmaceutical and biotechnology development, industrial chemistry, diagnostics, food and environmental testing, and other laboratory applications. The brand was formed in 1975 when two American specialty-chemical companies, Sigma Chemical Company of St. Louis and Aldrich Chemical Company of Milwaukee, merged. Their combination joined Sigma's biochemical expertise with Aldrich's strengths in organic and inorganic chemicals, synthesis reagents, and advanced materials. The businesses that preceded Sigma-Aldrich had already developed distinctive scientific niches. Sigma began with the production of adenosine triphosphate and became associated with biochemical reagents, while Aldrich initially focused on specialized research chemicals and later expanded into boranes, synthesis intermediates, and other fine chemicals. After the merger, Sigma-Aldrich broadened its catalog through internal development and a long sequence of acquisitions. These included Fluka, Supelco, Riedel-de Haën, ISOTEC, JRH Biosciences, Proligo, BioReliance, Cell Marque, and other companies serving chromatography, stable isotopes, cell culture, genomics, analytical chemistry, diagnostics, and pharmaceutical manufacturing. The brand became known for the breadth and technical utility of its catalog. Its products included laboratory reagents, solvents, buffers, enzymes, antibodies, proteins, peptides, nucleotides, carbohydrates, amino acids, antibiotics, cell-culture materials, analytical standards, chromatography columns, stable-isotope compounds, custom oligonucleotides, and specialized tools for neuroscience and cell signaling. The Aldrich Catalog and Handbook was widely used as a practical reference because it combined chemical structures, physical data, and literature references with product listings. The company also supplied fine chemicals and manufacturing inputs for pharmaceutical and biotechnology customers, extending its role beyond ordinary laboratory distribution. Sigma-Aldrich grew internationally and operated in approximately 40 countries before its acquisition. It served a broad customer base ranging from individual researchers and university laboratories to large pharmaceutical, biotechnology, chemical, food, environmental, and government organizations. Its expansion was supported by acquisitions as well as participation in emerging research fields, including RNA interference, genetic engineering, viral manufacturing, and advanced separation technologies. Merck KGaA, Darmstadt, Germany, announced an agreement to acquire Sigma-Aldrich in 2014. The transaction was completed in 2015 for approximately $17 billion and brought Sigma-Aldrich together with Merck's previously acquired Millipore business. The combined life-science operation is known as MilliporeSigma in the United States; the Sigma-Aldrich name continues as a major commercial brand within Merck's life-science portfolio. The business is now associated with a much broader platform spanning research chemicals, laboratory supplies, bioprocessing, analytical testing, and production materials. The brand's present positioning is therefore that of a technically deep, globally distributed supplier for the full research and biomanufacturing workflow rather than a standalone publicly traded company.
History
Sigma-Aldrich's history combines the development of two American specialty-chemical companies. Midwest Consultants was established in St. Louis in 1935 by Aaron Fischer and Bernard Fischlowitz, with chemical engineer Daniel Broida involved in its early development. In 1946, the business became Sigma and concentrated initially on adenosine triphosphate, becoming an early manufacturer of highly pure ATP for biochemical research. Aldrich Chemical Company was founded in Milwaukee in 1951 by Alfred Bader and Jack Eisendrath. Its first product was a specialized research compound, 1-methyl-3-nitro-1-nitrosoguanidine. Aldrich later expanded into organic synthesis chemicals and launched Aldrich-Boranes in 1972 to produce hydroboration products. Both companies became publicly traded before their combination: Aldrich held its initial public offering in 1966, while Sigma went public in 1972. The two companies merged in August 1975 to create Sigma-Aldrich. The combined company reported first-year sales of approximately $43 million and spent the following decades expanding its product range, manufacturing base, and international distribution. During the late 1970s and 1980s it acquired or developed businesses including Makor Chemicals, Pathfinder, Bio Yeda, Bristol Organics, and Fluka Chemie. Fluka strengthened the company's position in analytical and specialty reagents. During the 1990s, Sigma-Aldrich broadened its laboratory platform through acquisitions such as Supelco, LabKemi, Research Biochemicals International, Riedel-de Haën, Techcares Systems, Carbolabs, YA Kemia, and Genosys. Supelco gave the company a major presence in chromatography, while Riedel-de Haën added established reagents and reference standards. The company reached approximately $1 billion in sales in 1999 and continued to diversify across biochemistry, analytical chemistry, genomics, and materials science. The 2000s brought further expansion into medical research, stable isotopes, cell culture, pharmaceutical development, and biotechnology manufacturing. Acquisitions included ISOTEC, Amelung, ARK Scientific, Tetrionics, Ultrafine, JRH Biosciences, Proligo, Advanced Separation Technologies, Epichem, Molecular Medicine BioServices, and other regional or specialist businesses. Sigma-Aldrich also participated in The RNAi Consortium and entered collaborations related to zinc-finger genetic-engineering research. In 2008 it formed SAGE Labs, which developed genetically modified research animals and related disease-model systems; that business was later sold to Horizon Discovery Group in 2014. The company continued its acquisition program in the 2010s, adding businesses such as Cerilliant, ACE Animals, Resource Technology, Vetec Química Fina, Research Organics, BioReliance, and Cell Marque. BioReliance expanded testing and manufacturing services for pharmaceutical and biopharmaceutical customers, while Cell Marque strengthened the pathology and immunohistochemistry portfolio. By this period, Sigma-Aldrich had become a large international supplier serving approximately one million individual customers and tens of thousands of organizational accounts. In 2014, Merck KGaA announced its intention to purchase Sigma-Aldrich. Sigma-Aldrich filed a definitive proxy statement in November of that year seeking approval for the transaction. The acquisition was completed in 2015. Sigma-Aldrich was combined with EMD Millipore, Merck's existing life-science business, and the resulting operation became MilliporeSigma in the United States. Sigma-Aldrich remains a principal brand within Merck's life-science activities, while the broader business now covers research reagents, analytical products, bioprocessing, manufacturing materials, and laboratory services.
- 2015
Sigma-Aldrich becomes part of MilliporeSigma
[1]The acquisition closes and Sigma-Aldrich is combined with Merck's Millipore life-science business.
- 2014
Merck KGaA announces acquisition
[1]Merck KGaA announces its plan to acquire Sigma-Aldrich for approximately $17 billion.
- 2012
BioReliance is acquired
[1]The acquisition strengthens testing and manufacturing services for pharmaceutical and biopharmaceutical customers.
- 2005
RNA interference research participation expands
[1]Sigma-Aldrich announces membership in The RNAi Consortium and continues developing genomics research tools.
- 1999
Sales reach approximately one billion dollars
[1]The company reaches approximately $1 billion in sales as its catalog and international operations expand.
- 1993
Supelco is acquired
[1]Sigma-Aldrich enters and expands its chromatography products business through the acquisition of Supelco.
- 1989
Fluka Chemie is acquired
[1]The acquisition adds a significant Swiss specialty-reagents business to Sigma-Aldrich.
- 1975
Sigma and Aldrich merge
[1]The two American specialty-chemical companies combine in August to form Sigma-Aldrich.
- 1951
Aldrich Chemical Company is founded
[1]Alfred Bader and Jack Eisendrath establish Aldrich in Milwaukee as a specialty research-chemicals company.
- 1946
Sigma is formed
[1]The Sigma business emerges from Midwest Consultants and initially focuses on highly pure adenosine triphosphate.
Products and positioning
A high-trust, technically broad supplier for research, analytical testing, pharmaceutical development, biotechnology, and industrial laboratories.
Chemical synthesis
Aldrich
Aldrich supplies organic and inorganic chemicals, synthesis building blocks, reagents, advanced materials, boranes, stable isotopes, and other fine chemicals used in medicinal chemistry, materials science, and laboratory research. Its catalog is particularly associated with compounds used in chemical synthesis and with reference information accompanying product listings.
Biochemical research reagents · 1946
Sigma
The Sigma line covers biochemical and life-science reagents including antibiotics, buffers, carbohydrates, enzymes, nucleotides, proteins, peptides, amino acids, hematology materials, histology products, and forensic tools. It developed from the company's historic biochemical-reagent business and remains one of the most recognizable product families in the portfolio.
Chromatography and analytical chemistry · 1993
Supelco
Supelco provides chromatography columns, sample-preparation products, analytical standards, and related tools for environmental, food and beverage, pharmaceutical, biotechnology, government, medical, and chemical laboratories. The line supports separation, identification, and quantitative analysis of chemical substances.
Stable isotopes · 2001
ISOTEC
ISOTEC supplies isotopically labeled compounds and gases for protein-structure studies, peptide synthesis, proteomics, metabolic research, magnetic resonance imaging, nuclear magnetic resonance, breath testing, agriculture, and related applications.
Reagents and reference standards · 1997
Riedel-de Haën
Riedel-de Haën contributes laboratory reagents, analytical standards, and specialty chemicals used in research and quality-control settings. The business became part of Sigma-Aldrich through the company's acquisition program and remains associated with analytical reliability and standardized laboratory materials.
Fine chemicals and biopharmaceutical materials
SAFC
SAFC supplies raw materials for cell culture and other biopharmaceutical processes, together with customized services and manufacturing support for active pharmaceutical ingredients and development programs. It represents Sigma-Aldrich's role in production-oriented pharmaceutical and biotechnology supply chains.
Genomics and molecular biology
Sigma Life Science
Sigma Life Science provides custom DNA and RNA oligonucleotides, LNA probes, siRNA, isotopically labeled peptides, peptide libraries, and related molecular-biology products for gene-expression, sequencing, screening, and functional-genomics research.
Cell signaling and neuroscience
Sigma RBI
Sigma RBI offers biochemical and pharmacological tools for cell signaling and neuroscience, including receptor and ion-channel ligands, enzyme inhibitors, phosphospecific antibodies, signaling enzymes, and assay kits.
Brand decisions
2015
Integrate Sigma-Aldrich with MilliporeStrategyBackground
Merck KGaA already owned Millipore, another major life-science supplier, and sought to create a more comprehensive research and bioprocessing platform.
Action taken
Merck combined Sigma-Aldrich with EMD Millipore after completing the acquisition.
Aftermath
The combined operation became known as MilliporeSigma in the United States, while Sigma-Aldrich continued as a commercial brand within Merck's life-science business.
2014
Agree to acquisition by Merck KGaAM&ABackground
Sigma-Aldrich had become a large international supplier spanning research chemicals, analytical products, biotechnology, and pharmaceutical services.
Action taken
Merck KGaA announced an agreement to acquire Sigma-Aldrich for approximately $17 billion, and Sigma-Aldrich submitted a definitive proxy statement for investor approval.
Aftermath
The transaction closed in 2015 and Sigma-Aldrich was combined with Merck's Millipore business to form the basis of MilliporeSigma in the United States.
Announced acquisition value. $17 billion (2014 announced transaction)
1975
Merge Sigma Chemical Company with Aldrich Chemical CompanyM&ABackground
Both companies operated as American specialty-chemical suppliers with complementary biochemical and chemical-synthesis capabilities.
Action taken
The companies combined in August 1975 to create Sigma-Aldrich.
Aftermath
The merger created a broader supplier whose catalog could serve both biochemical research and chemical synthesis markets.
Recent events
- 2025
Jean-Charles Wirth becomes chief executive of Merck's Life Science business[1]
Leadership change
Jean-Charles Wirth succeeded Matthias Heinzel as chief executive of the Life Science business of Merck KGaA.
- 2015
Sigma-Aldrich completes combination with Merck's Millipore business[1]
M&A
Following the acquisition, Sigma-Aldrich was combined with the earlier Millipore business to form the foundation of Merck's integrated life-science operation, known as MilliporeSigma in the United States.
- 2015
Merck completes acquisition of Sigma-Aldrich[1]
M&A
Merck completed its acquisition of Sigma-Aldrich Corporation, bringing the Sigma-Aldrich business into Merck's Life Science division and expanding the group's laboratory and biopharmaceutical materials portfolio.
- 2014
Merck KGaA announces agreement to acquire Sigma-Aldrich[1]
M&A
Merck KGaA announced a proposed acquisition of Sigma-Aldrich valued at approximately $17 billion, subject to investor and regulatory approvals.
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