Allessa GmbH

What Allessa GmbH does

Allessa GmbH is a privately held German fine and specialty chemicals manufacturer headquartered at Alt-Fechenheim 34, 60386 Frankfurt, operating as the principal production site within the WeylChem Group of Companies (owned by International Chemicals Investors Group, ICIG). The company runs over 200 multi-purpose batch reactors totaling more than 2,000 m³ across glass-lined, ceramic, carbon steel, stainless steel, and alloy constructions, with reactor sizes ranging from 0.5 m³ to 30 m³, supporting a pilot plant (50 kg to 1 t/year) and four large-scale multi-purpose plants (10 to 10,000 t/year). Core process competencies are bromination and chlorination (including elemental bromine handling with mother-liquor recycling), Friedel-Crafts alkylation and acylation up to 30 m³, and phosphorous chemistry, including the proprietary Allessan® CAP (PPAA/T3P) coupling reagent produced in an ISO 9001-certified facility at several hundred tons per year capacity. Allessa also operates the world's largest production line for Phenothiazine Prills, an amine-based radical scavenger used as a monomer stabilizer, antioxidant, and pharmaceutical building block.

The business model combines a contract development and manufacturing organization (CDMO) service for complex multi-step syntheses with a proprietary advanced-intermediates product portfolio. Customers engage via product-specific website contact forms and named sales contacts (e.g., Cameron Young at WeylChem US for North America), with projects quoted on a per-campaign basis. Verticals served include pharmaceuticals, agrochemicals, catalysts and ligands, electronics, cosmetics, polymers, oil & gas, new energy solutions (redox flow batteries), pigments and dyes, and renewable/green chemistry. Backward and forward integration of multi-step syntheses at a single site reduces customer site-to-site transfer risk and logistics cost.

Allessa operates as one of nine companies in the WeylChem Group, which employs approximately 1,400 people and reported consolidated turnover of approximately EUR 430 million in 2024 across sites in Germany (Frankfurt, Bitterfeld-Wolfen, Wesseling, Höchst), France (Trosly-Breuil), Spain (Zierbena/Bilbao), the United States (Greensboro, NC sales hub; Elgin, SC production), and India (Hyderabad and Visakhapatnam). The site holds an EcoVadis Silver medal and adheres to EFCG/CEFIC voluntary guidelines; Dr. Benjamin Bechem was appointed Managing Director in February 2025 in addition to his WeylChem ORGANICA and CDMO platform leadership.

Name

Allessa GmbH

Legal name

Allessa GmbH

Website

https://weylchem.com

Company type

Private

Founded year

2001

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Allessa GmbH is a Frankfurt-based fine and specialty chemicals CDMO within the WeylChem Group, operating over 200 batch reactors (0.5–30 m³) to deliver multi-step custom manufacturing and proprietary advanced intermediates (notably Phenothiazine Prills and Allessan® CAP) to pharmaceutical, agrochemical, polymer, and electronics customers globally.

Ownership category

akta.pro rank

Product category

Specialty Chemicals Manufacturing (CDMO)

NAICS

Chemical Manufacturing (325), Pharmaceutical and Medicine Manufacturing (3254)

SIC

Chemicals & Allied Products (2800), Industrial Organic Chemicals (2860)

akta.pro primary industry

Drug Substance–Drug Product Integrated CDMO (HLAGABAG)

akta.pro secondary industry

Clinical Trial Material (CTM) Manufacturing & Supply CDMO (HLAGABAK)

Keywords

• Specialty chemicals manufacturing
• Contract chemical manufacturing
• Fine chemicals CDMO
• Advanced chemical intermediates
• Multi-step chemical synthesis

Headquarters

HQ city

Frankfurt

HQ country

Germany

HQ region

Europe

Offices9 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Infrastructure, Technology or R&D, Marketing or Sales

Revenue model

1. Custom Manufacturing / CDMO services: Contract development and manufacturing of fine chemicals for third-party customers, from lab/pilot (50 kg–1 t/year) through commercial scale (10–10,000 t/year). Multi-step synthesis with backward/forward integration.
2. Advanced Intermediates product sales: Sale of proprietary advanced intermediates (e.g., Phenothiazine Prills, Allessan® CAP, Crotonic acid, Methoxyacetic acid, Cyanuric Chloride, TAICROS®, TAC, Glyoxal, Glyoxylic acid, sulfuric acid) into agrochemical, pharmaceutical, polymer, electronics, and detergent industries.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

Allessa GmbH operates as a multi-purpose contract development and manufacturing organization (CDMO) for fine and specialty chemicals at its Frankfurt-Fechenheim site, combining a pilot plant (50 kg–1 t/year) with four large-scale multipurpose plants (10–10,000 t/year) across over 200 batch reactors. It also produces and sells a proprietary portfolio of advanced intermediates, including Phenothiazine Prills (world's largest production), the Allessan® specialty-chemical line (CAP, Protacryl B15, SR 3044), and other intermediates for agrochemical, pharmaceutical, polymer, electronics and cosmetics customers.

Product overview

Allessa GmbH, headquartered at Alt-Fechenheim 34, 60386 Frankfurt, Germany, is the specialty-chemicals manufacturing arm of the WeylChem Group of Companies, operating a unified CDMO (Custom Development and Manufacturing Organization) platform rather than a discrete software product. Its offering combines core contract-manufacturing services (piloting through 10,000-tons-per-year multi-purpose plants) with a focused proprietary product portfolio: Phenothiazine Prills (the world's largest production), the Allessan® specialty-chemical line led by Allessan® CAP (PPAA / T3P coupling reagent) and supported by Allessan® Protacryl B15 and Allessan® SR 3044, all leveraging the site's core competencies in Bromination, Chlorination, Friedel-Crafts reactions, and Phosphorous Chemistry.

Differentiator

Problem solved

Functional benefit

Brands

• Allessan®: Brand of specialty chemical coupling and water-removal reagents (including Allessan® CAP, Allessan® Protacryl B15, Allessan® SR 3044, Allessan® T 3038) produced at the Allessa GmbH site.
• Phenothiazine Prills

Products and services

• Phenothiazine Prills Amine-based radical scavenger used as a monomer stabilizer for unsaturated compounds, antioxidant, and pharmaceutical building block; produced at the Allessa GmbH Frankfurt-Fechenheim site as the world's largest Phenothiazine Prills producer with spherical prills delivering improved solubility, lower dust, and better handling versus flakes.
• Allessan® CAP (PPAA / T3P) Propanephosphonic acid anhydride (PPAA / T3P) supplied as a ~50% w/w solution; a less-toxic coupling and water-removal reagent for amidation, peptide coupling, esterification and functional group transformations, with several hundred tons per year capacity produced at the ISO 9001-certified Allessa facility.
• Allessan® Protacryl B15 Allessan®-branded specialty chemical product from Allessa GmbH, listed alongside other Allessan® grades for use in coupling and related applications.
• Allessan® SR 3044 Allessan®-branded specialty chemical product from Allessa GmbH, listed alongside other Allessan® grades for specialty chemistry applications.
• Custom Manufacturing (CDMO) Services Multi-purpose contract manufacturing for fine chemicals combining a pilot plant (50 kg to 1 ton per year, reactors up to 1 m³) with four large-scale multipurpose plants (10 to 10,000 tons per year, reactors up to 30 m³) and over 200 batch reactors in glass-lined, ceramics, carbon steel, stainless steel, and alloys; core process technologies include Bromination and Chlorination, Friedel-Crafts Reaction, and Phosphorous Chemistry.

Quantifiable outcome

• Phenothiazine Prills assay ≥99.5%, particle size >500 μm at ≥98.0%, melting point ≥184°C, dust reduction via prill form.
• +2 more outcomes

Segments10 records

Ideal customer profiles10 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Two partnerships are on record, tiered core.

• EcoVadiscoreStrategic or Co-development PartnerAllessa GmbH (and sibling site WeylChem Lamotte) holds an EcoVadis Silver medal for CSR ratings; the broader WeylChem Group pursues EcoVadis Gold Status for sustainability performance. ESG reporting and audits are conducted through this partnership.
• EFCG / CEFICcoreOthersAllessa is fully committed to follow the Voluntary Guidelines of EFCG (European Fine Chemicals Group) / CEFIC (European Chemical Industry Council), aligning quality and compliance standards with the broader European fine-chemicals industry.

Scale indicators7 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Saltigo GmbH: Lanxess-owned fine-chemicals CDMO based in Leverkusen, Germany; offers multi-purpose batch manufacturing of custom intermediates for agro and pharma — directly comparable to Allessa's Frankfurt asset base and customer mix.
• Siegfried Holding AG: Swiss CDMO for active pharmaceutical ingredients and intermediates with multi-purpose plants in Switzerland, Germany, Malta and the US; comparable in pharma CDMO scope, regulatory posture, and quote-based B2B project model.
• Cambrex Corporation: US-headquartered CDMO specializing in small-molecule APIs and intermediates; comparable in offering multi-step custom synthesis from clinical to commercial scale for branded and generic pharma customers.

Broad incumbents

• Lonza Group AG: Global large-cap CDMO and API manufacturer; overlaps with Allessa on fine-chemical intermediates and pharma custom manufacturing, but operates at materially larger scale and broader modality footprint.
• Catalent, Inc. Major global CDMO with significant small-molecule and biologics capabilities; overlaps on pharmaceutical custom manufacturing services but is a broader, publicly-traded incumbent rather than a fine-chemical specialist.
• Evonik Industries AG: German specialty chemicals major with a Custom Solutions CDMO business and adjacent specialty additives; competes for the same fine-chemicals customer wallet across pharma, agro, and polymers.
• Johnson Matthey Fine Chemicals: Division of Johnson Matthey focused on custom complex APIs and intermediates; overlaps on multi-step synthesis and hazardous chemistries for pharma and agro end-markets.

Emerging players

• PMC ISOCHEM (PMC Group): French fine-chemicals CDMO acquired by PMC Group; offers custom multi-step synthesis and specialty intermediates for pharma, agro, and flavors & fragrances — direct overlap with Allessa's Bitterfeld-Wolfen sibling WeylChem ORGANICA.
• Almac Group: Northern Ireland-headquartered CDMO with custom pharmaceutical API/intermediate manufacturing; comparable in multi-purpose batch assets and B2B quote-based model, though smaller-scale and more pharma-centric.
• Helsinn Group: Swiss private specialty CDMO focused on pharmaceutical intermediates and APIs; comparable in CDMO scope, regulated-end-market exposure, and project-based enterprise sales motion.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCoMGXGFOcyuyRD0gGS1_QTA
• LinkedInlinkedin.com/company/weylchem-group

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Allessa GmbH