SI Group

What SI Group does

SI Group is a global developer and manufacturer of performance additives, process solutions, active pharmaceutical ingredients, and chemical intermediates serving plastics, rubber, fuels, lubricants, coatings, oilfield, and pharmaceutical end markets. The company's product portfolio is organized around proprietary technology platforms and brands including WESTON (phosphite antioxidants), NAUGARD (antioxidants and curing accelerators, including the bio-based NAUGARD BIO-XL), EVERCYCLE (recycling additive solutions), ETHAFLOW and ETHANOX (lubricant additives), LOWINOX (phenolic antioxidants), ULTRANOX and ANOX (polyolefin antioxidants), CERIFLOW (paraffin inhibition), ELAZTOBOND (bonding resins), LOWILITE (UV stabilizers), and POLYBOND (polymer bonding agents), plus Propofol API for injectable anesthetics. Core technologies span nonylphenol-free liquid phosphite antioxidants, bio-based ultra-accelerators containing over 85% bio-based materials, ashless multifunctional lubricant additives, and circular-economy additive blends for PET and polyolefin recycling.

The company operates 18 manufacturing facilities and joint ventures across three continents (United States, France, Germany, Switzerland, United Kingdom, China, South Korea, Singapore, India, Brazil, Saudi Arabia via JV, and Sichuan, China via the Shengnova JV), serving customers in 80+ countries with a workforce of approximately 1,500-1,600 employees. SI Group generates revenue primarily through one-time product sales of formulated specialty chemicals and custom solutions to industrial customers, with quote-based, non-publicly-disclosed pricing. Go-to-market is executed through regional direct sales teams organized around five markets (Core Solutions, Fuel & Lubricants, Oilfield, Plastics, Rubber & Adhesives) covering Americas, EMEA, India, and APAC, complemented by channel partnerships with Univar Solutions and Azelis for EMEA distribution. The company is privately held by SK Capital Partners and underwent a comprehensive recapitalization in December 2025 that reduced net indebtedness by approximately $1.7 billion and introduced a new institutional ownership group.

Name

SI Group

Legal name

SI Group, Inc.

Website

https://siigroup.com

Company type

Private

Founded year

1890

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

SI Group is a global developer and manufacturer of performance additives, process solutions, active pharmaceutical ingredients, and chemical intermediates serving plastics, rubber, fuel, lubricant, coatings, oilfield, and pharmaceutical customers across 80+ countries via 18 manufacturing facilities.

Ownership category

akta.pro rank

Product category

Specialty Chemicals

NAICS

Chemical Manufacturing (325), Plastics Material and Resin Manufacturing (325211), Custom Compounding of Purchased Resins (325991)

SIC

Industrial Organic Chemicals (2860), Miscellaneous Chemical Products (2890)

akta.pro primary industry

Specialty Polymers & Resins (Engineered Materials) (IMAEABAK)

akta.pro secondary industries

Lubricant Additives & Performance Chemicals (EUALAJAB), Silica-Filled & Low-Rolling-Resistance Tire Compounds (IMANAJAE)

Keywords

• Performance additives manufacturing
• Chemical intermediates supply
• Phenolic resins production
• Polymer stabilizers industry
• Rubber additives solutions

Headquarters

HQ city

The Woodlands

HQ country

United States

HQ region

North America

Offices26 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Performance Additives: SI Group generates revenue through development and manufacture of performance additives including antioxidants, UV stabilizers, curing accelerators, and specialty additives for plastics, rubber, fuels, lubricants, and coatings industries. These are sold as formulated products and custom solutions.
2. Process Solutions: Process solutions including chemical intermediates for industrial uses, resin systems, and specialty chemicals for manufacturing processes.
3. Active Pharmaceutical Ingredients: SI Group produces Propofol API for pharmaceutical formulations, serving healthcare and pharmaceutical customers with supply availability in the U.S.
4. Chemical Intermediates: Alkylphenols, alkyl-cresols, and other chemical intermediates used in high-performance antioxidant applications and various industrial processes.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

SI Group develops and manufactures performance additives, process solutions, active pharmaceutical ingredients, and chemical intermediates used as inputs in plastics, rubber, fuels, lubricants, oilfield, coatings, and pharmaceutical applications. The portfolio includes antioxidants, UV stabilizers, curing accelerators, phosphite antioxidants, bonding resins, asphaltene inhibitors, and bio-based additives sold under brands such as ANOX, NAUGARD, WESTON, EVERCYCLE, ETHAFLOW, LOWINOX, LOWILITE, and ULTRANOX.

Product overview

SI Group is a global developer and manufacturer of performance additives, process solutions, active pharmaceutical ingredients, and chemical intermediates. The portfolio includes leading additive solutions for plastics, rubber, fuels, lubricants, and more, with products organized under brands including ANOX™, ETHANOX™, NAUGARD™, LOWINOX™, WESTON™, EVERCYCLE™, ETHAFLOW™, CERIFLOW™, and ULTRANOX™. Key product lines include antioxidants and stabilizers for polymer protection, curing accelerators like NAUGARD BIO-XL™ for rubber applications, UV light stabilizers, phosphite antioxidants such as WESTON™ 705 for plastics and elastomers, circular economy solutions under EVERCYCLE™ for plastic recycling, lubricant additives like ETHAFLOW™ 6705, and active pharmaceutical ingredients including Propofol API. The company operates 18 manufacturing facilities across three continents serving customers in over 80 countries.

Differentiator

Problem solved

Functional benefit

Brands

• ANOX: Brand of antioxidant products
• NAUGARD
• WESTON
• EVERCYCLE
• ETHANOX
• ETHAFLOW
• CERIFLOW
• LOWINOX
• NAUGAWHITE
• ULTRANOX
• NaugaShield
• ELAZTOBOND
• LOWILITE
• SUNPROOF
• NAUGASHIELD
• NAUGATAC

Products and services

• NAUGARD BIO-XL Ultra-accelerator containing over 85% bio-based materials for sulfur cure of natural and synthetic rubbers. Does not release harmful nitrosamines and offers high solubility, low blooming, and improved scorch safety. Used by rubber and tire manufacturers.
• WESTON 705 Next-generation nonylphenol-free liquid phosphite antioxidant designed for superior gel protection and color stability during polyethylene and synthetic elastomer production. Approved for food contact worldwide (FDA, EFSA, NHFPC). Used by plastics and elastomer producers.
• EVERCYCLE PET-103D Additive blend for PET recycling of food-approved bottle flakes. Liquid dosing solution for color and acetaldehyde prevention in mechanical recycling. Used by PET recyclers, converters, and producers in the circular economy.
• ETHAFLOW 6705 Liquid ashless proprietary additive for lubricants and greases providing multi-functional performance including high-performance wear and oxidation protection, stable friction modification, and copper compatibility. No GHS classifications. Used by lubricant and grease formulators.
• NaugaShield BIO-TR 30 Bio-based cut and chip resin for high demand rubber applications. Improves cut and chip resistance in off-road tires, mining conveyor belts, rubber tracks, and mill linings. Used by industrial rubber goods manufacturers.
• Propofol API Active pharmaceutical ingredient for injectable anesthetic formulations designed for rapid induction and maintenance of anesthesia during surgical procedures. Used by pharmaceutical companies.
• ANOX Antioxidants Antioxidant brand line for plastics stabilization, compounding, and circularity applications. Used by polymer producers, compounders, and plastics manufacturers.
• NAUGARD Antioxidants and Curing Accelerators Brand line of antioxidants and curing accelerators for rubber and plastics applications. Used by rubber and plastics manufacturers.
• ETHANOX Antioxidants Antioxidant brand line for lubricants, greases, and industrial applications. Used by lubricant formulators and industrial chemical manufacturers.
• ULTRANOX Antioxidants Low color antioxidant platform for polyolefins and engineering resins. Used by polymer producers and compounders.
• LOWINOX Phenolic Antioxidants Phenolic antioxidant brand line for various industrial applications. Used by plastics, rubber, and lubricant manufacturers.
• LOWILITE UV Light Stabilizers UV light stabilizers for polymer protection. Used by plastics, coatings, and polymer compounders.
• CERIFLOW Paraffin Inhibition and Asphaltene Stabilization Products Products for low temperature paraffin inhibition and asphaltene stabilization in oilfield production chemistry. Used by oilfield service companies and upstream operators.
• ELAZTOBOND Bonding Resins Bonding resins for adhesion applications. Used by rubber and adhesive manufacturers.
• POLYBOND Polymer Bonding and Coupling Agents Polymer bonding and coupling agents for reinforced polymers and filled resin systems. Used by plastics compounders.

Quantifiable outcome

• Top 15% globally in EcoVadis sustainability assessment (85th percentile)
• +2 more outcomes

Named customers2 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Four partnerships are on record, tiered core and minor.

• Shengxiao GroupcoreStrategic or Co-development Partner · 26 June 2026Joint venture called Shengnova Advanced Materials established in Sichuan, China to accelerate biphenol production capacity. Combines Shengxiao's established manufacturing assets and regional market access with SI Group's proprietary biphenol technology and global expertise. Serves growing demand across Asia-Pacific for high-performance materials used in electronics, automotive, and medical applications. SI Group continues operating its Newport, Tennessee facility while expanding multi-regional production network.
• Univar SolutionscoreChannel Partner/ Reseller/ Distributor · 11 March 2026Expanded distribution agreement covering SI Group's portfolio of performance additives for plastics and adhesives across select EMEA markets including Türkiye and the Iberia region. Univar leverages its global Solution Centres including flagship facility in Essen, Germany to provide technical formulation support and regulatory expertise. Covers antioxidants, stabilizers, UV light stabilizers, and impact modifiers.
• AzeliscoreChannel Partner/ Reseller/ Distributor · 7 October 2025Strategic partnership to expand EMEA distribution network for plastics additives. Azelis provides broader reach and technical capabilities to serve polymer manufacturers across European markets.
• Government of the Solomon IslandsminorStrategic or Co-development Partner · 12 June 2025Memorandum of Understanding establishing SI Group as strategic adviser and priority investor for development and international promotion of Solomon Islands' first Special Economic Zone. The SEZ will cover marine economy, agriculture, natural resources, social services, education, tourism, infrastructure, finance, and logistics.

Scale indicators7 records

Recent moves9 records

Expansion highlights6 records

Broad incumbents

• Albemarle Corporation: Specialty chemicals company from which SI Group acquired the antioxidant and API business in 2014. Comparable heritage in bromine-based and phosphorus-based antioxidants; Albemarle has since pivoted to lithium but maintains overlap in specialty additives and APIs.
• Evonik Industries: German specialty chemicals major producing additives, intermediates, and performance materials for plastics, coatings, and rubber industries. Comparable end-market overlap and additive portfolio, with broader portfolio scale and stronger European positioning.
• BASF: Global chemical giant with a substantial performance additives, antioxidants, and specialty chemicals portfolio serving plastics, rubber, and coatings markets. Comparable as a broad-line competitor in the same end markets SI Group addresses, though BASF is significantly larger and more diversified.
• Eastman Chemical: Specialty chemical manufacturer producing performance additives, plasticizers, and chemical intermediates across plastics, rubber, and coatings end markets. Comparable business model and end-market exposure, with broader portfolio and larger scale than SI Group.
• Syensqo (Solvay Specialty): Specialty chemicals company (spun from Solvay) producing advanced materials, polymer additives, and specialty ingredients for automotive, electronics, and industrial markets. Comparable as a science-driven specialty additives and materials supplier with global scale.

Direct peers

• PMC Group: Private specialty chemicals manufacturer producing polymer additives, plasticizers, flame retardants, and chemical intermediates. PE-owned (One Rock Capital) with comparable scale and similar portfolio breadth in plastics, rubber, and lubricants additives.
• Adeka Corporation: Japanese specialty chemicals company producing polymer additives, UV stabilizers, antioxidants, and epoxy resin materials. Comparable as a specialty additive producer with global footprint, particularly strong in Asia-Pacific markets where SI Group is also expanding via its China JV.
• Lanxess: Specialty chemicals company with strong positions in rubber additives, curing accelerators, antioxidants, and performance chemicals — directly overlapping with SI Group's Rubber & Adhesives and Plastics segments. Closest direct peer in rubber chemicals and specialty additives.
• Innospec: Specialty chemicals producer focused on fuel additives, lubricant additives, and oilfield chemistries — directly comparable to SI Group's Fuel, Lubricants & Coatings and Oilfield segments. Similar mid-cap scale and product portfolio overlap.
• Songwon Industrial: Specialty chemicals producer focused on polymer stabilizers, UV absorbers, and antioxidants for plastics and rubber applications. Direct head-to-head competitor in the polymer additives market, with overlapping brand portfolios (Songnox, Songsorb) similar to SI Group's ANOX, ULTRANOX, LOWILITE lines.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/SIGroupInside
• LinkedInlinkedin.com/company/si-group

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles11 records

Subsidiaries10 records

Funding overview

Funding rounds1 record

Investors

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

M&A2 records

Investments

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

Frequently asked questions about SI Group