SI Group
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.
- Company typePrivate
- Founded1890
- HeadquartersThe Woodlands, United States
- Headcount1,001–5,000
- GTM typeB2B
- OfferingHardware or Manufacturing
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.
SI Group firmographics
Firmographics- 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
SI Group industry classification
Industry- 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
Where SI Group is headquartered
LocationHeadquarters
- HQ city
- The Woodlands
- HQ country
- United States
- HQ region
- North America
Offices26 records
Markets served
SI Group business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Operations, Supply Chain, Personnel, Technology or R&D, Infrastructure, Marketing or Sales
Revenue model
- 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.
- Process Solutions: Process solutions including chemical intermediates for industrial uses, resin systems, and specialty chemicals for manufacturing processes.
- Active Pharmaceutical Ingredients: SI Group produces Propofol API for pharmaceutical formulations, serving healthcare and pharmaceutical customers with supply availability in the U.S.
- 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
SI Group product offering
Product offeringCore 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
Companies that use SI Group
Customer profileNamed customers2 records
Segments5 records
Ideal customer profiles4 records
SI Group technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
SI Group partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered core and minor.
- Shengxiao GroupcoreJoint 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 SolutionscoreExpanded 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.
- AzeliscoreStrategic 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 IslandsminorMemorandum 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
SI Group competitors and assessment
Company assessmentBroad 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
SI Group social profiles
Digital presenceSI Group compliance and trust
Trust signalCompliance4 records
SI Group financial estimates
Financial estimateRevenue estimate
Valuation estimate
SI Group leadership team
Management profileNumber of profiles
Profiles11 records
SI Group subsidiaries and ownership
Company hierarchySubsidiaries10 records
SI Group funding detail
Funding detailFunding overview
Funding rounds1 record
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
SI Group M&A and investment
M&A and investmentM&A2 records
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about SI Group
What does SI Group do?
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.
Is SI Group a public or private company?
SI Group is a private company. It is classified as private equity controlled and is currently operating.
When was SI Group founded?
SI Group was founded in 1890. It employs 1,001 to 5,000 people.
Where is SI Group based?
SI Group is headquartered in The Woodlands, United States, in the North America region.
How does SI Group make money?
Four revenue lines are on record. Performance Additives are the primary driver. The others are process Solutions, active Pharmaceutical Ingredients and chemical Intermediates.
Who are SI Group's main competitors?
Broad incumbents on record are Albemarle Corporation, Evonik Industries, BASF, Eastman Chemical and Syensqo (Solvay Specialty). Direct peers are PMC Group, Adeka Corporation, Lanxess, Innospec and Songwon Industrial.
Does SI Group have an API?
No public API is recorded for SI Group.
What industry is SI Group in?
SI Group's product category is Specialty Chemicals. Its primary akta.pro industry code is IMAEABAK, Specialty Polymers & Resins (Engineered Materials), with a secondary code of EUALAJAB, Lubricant Additives & Performance Chemicals. Its NAICS code is 325 and its SIC code is 2860.