Olin Corporation

FY2025 revenue

$6.78BDecember 31, 2025 · SEC XBRL

TRI facility leads

192024 U.S. match, unresolved

Managed listed chemicals

224.9M lb2024 U.S. TRI, aggregate

Recycled on/off-site

115.2M lb51% of managed volume, 2024 TRI

Top TRI chemical

Hydrochloric acidBy managed weight, Freeport, TX

Olin’s investor overview identifies three business segments: Chlor Alkali Products & Vinyls, Epoxy, and Winchester Ammunition.

01 · MATERIALS IN

Salt, ethylene & brass/lead/propellant inputs

Not publicly disclosed at parent level in this source set. Directional family: salt brine (chlor-alkali electrolysis feedstock), ethylene and benzene-chain chemicals for the Chlorovinyls and Epoxy segments, and metals/propellants for Winchester.

02 · MAKE

Chlor-alkali electrolysis & ammunition manufacturing

Chlorine and caustic soda production via salt-brine electrolysis at Freeport, TX and other Gulf Coast sites, alongside a wholly separate Winchester ammunition-manufacturing operation.

03 · PRODUCTS OUT

3 reporting segments

Olin identifies Chlor Alkali Products & Vinyls, Epoxy, and Winchester Ammunition as its three business segments.

04 · WASTE OUT

Listed-chemical streams

224.9M lb managed in 2024 TRI records across 19 matched facility leads, led by hydrochloric acid at the Freeport, TX chlor-alkali complex.

What is public now

Ticker / CIK NYSE: OLN · SEC CIK 0000074303

FY2025 revenue $6.78B, period ended December 31, 2025 (SEC XBRL)

Business model Olin’s investor overview identifies Chlor Alkali Products & Vinyls, Epoxy, and Winchester Ammunition as its three business segments.

Public plant signal 19 U.S. facilities matched to an Olin parent name in the 2024 TRI dataset; the Freeport, TX chlor-alkali complex is the top-volume named lead

Evidence boundary The cited investor overview identifies three business segments but does not describe facility-level sourcing or segment-level procurement arrangements.

What the public record tells us

As of October 6, 2026, Olin’s investor overview describes three business segments: Chlor Alkali Products & Vinyls, Epoxy, and Winchester Ammunition.

Recycling-share signal: 51% of Olin’s matched 2024 TRI volume is reported as recycled on- or off-site, a relatively strong share for a chlor-alkali producer, consistent with closed-loop brine and chlorine-derivative recovery common at large electrolysis complexes.

Financial coverage gap: a reported cost proxy is stale or unavailable in the underlying dataset; request current spend, purchase-order, or quote-level evidence, and specify which segment, before using a cost figure in a commercial conversation.

Regulatory and certification signals

Regulatory watchlist EPA chlor-alkali NESHAP mercury-cell phase-out rules, TSCA chemical review, ATF ammunition-manufacturing licensing (Winchester only), TRI listed-chemical reporting

Certification & reporting families Responsible Care (ACC member programs, chemicals segments only), company sustainability/ESG reporting

How to use this view Full detail sits in the Regulatory section: connect each requirement to the correct segment before treating it as applicable

Innovation and recovery signals

Material innovation Membrane-cell chlor-alkali technology (lower-mercury-risk than legacy mercury-cell processes) and lower-carbon epoxy resin formulations

Recovery pathways Brine and chlorine-derivative recovery consistent with the 51% matched TRI recycling share

Evidence boundary The cited investor overview names three segments; it does not identify their sourcing or procurement decision owners.

Olin’s investor overview lists Chlor Alkali Products & Vinyls, Epoxy, and Winchester Ammunition as separate business segments. This section summarizes company-reported descriptions and does not establish facility-level material flows.

Chlor Alkali Products and Vinyls

Olin is one of the largest chlor-alkali producers in the world, converting salt brine via electrolysis into chlorine, caustic soda, and hydrochloric acid at large Gulf Coast complexes including Freeport, TX. Chlorine and caustic soda are foundational commodity chemicals feeding PVC (vinyls), water treatment, pulp and paper, and a wide range of downstream chemical manufacturing, making this segment a genuine infrastructure-level supplier to much of the broader chemicals industry.

Epoxy

Olin’s Epoxy segment produces epoxy resins and intermediates (including allyl chloride and epichlorohydrin, chlorine-chain derivatives that connect this segment back to the Chlor Alkali business), serving coatings, composites, and adhesives customers, a genuine internal feedstock linkage between Olin’s two chemicals segments worth naming.

Winchester: a fully reported ammunition segment

Winchester is one of the most recognized ammunition brands in the United States, manufacturing sporting, self-defense, law-enforcement, and military ammunition. It is reported as a distinct, financially material Olin segment, not a subsidiary footnote, with its own manufacturing facilities, ATF licensing requirements, and commercial and government customer base entirely separate from Olin’s chemicals operations. A material-transition conversation touching Winchester would center on metals (brass, lead, copper) and propellant chemistry, not chlor-alkali or epoxy chemistry.

Olin does not publicly itemize feedstock volumes by segment or plant in this source set. The table below maps directional material families to each segment’s distinct chemistry, using TRI data as the anchor point for the chemicals side.

Financial scale context

$6.78B FY2025 revenue (period ended December 31, 2025, SEC XBRL) covers all three segments combined. A reported cost proxy is stale or unavailable in the underlying dataset; request current, segment-specific spend or purchase-order evidence rather than a blended enterprise figure.

Material transition focus

The practical entry point is segment-specific and should not be blended: chlorine-derivative recovery and lower-carbon caustic soda for Chlor Alkali/Vinyls, lower-embodied-carbon epoxy formulations for Epoxy, and brass/metal recovery for Winchester, each requiring a named plant and the correct business-unit owner.

Publicly described product families across Olin’s three segments, spanning foundational industrial chemicals and a nationally recognized ammunition brand.

Chlorine & caustic soda

Foundational chlor-alkali commodity chemicals feeding PVC, water treatment, and downstream chemical manufacturing.

Chlor Alkali Products and Vinyls

Hydrochloric acid

Co-product of chlor-alkali and vinyls chemistry.

Chlor Alkali Products and Vinyls

Vinyl chloride monomer (VCM) chain

PVC-precursor chemistry linked to the chlor-alkali platform.

Chlor Alkali Products and Vinyls

Epoxy resins & intermediates

Resin systems and chlorine-chain intermediates for coatings, composites, and adhesives.

Epoxy

Sporting & self-defense ammunition

Winchester-branded ammunition for consumer and sporting markets.

Winchester

Law-enforcement & military ammunition

Ammunition manufactured for government and defense customers.

Winchester

Product and application signal

Segment and product-family descriptions are public. Plant-level output volume by product line and customer-specific specification are not publicly disclosed. Treat any specific tonnage or grade claim as directional unless sourced to a named Olin filing or technical data sheet.

2024 TRI data gives a facility-level, U.S.-only view of Olin’s listed-chemical reporting, concentrated at the Freeport, TX chlor-alkali complex. TRI reporting applies to the chemicals segments; Winchester’s ammunition manufacturing sits under separate ATF, not TRI, oversight.

Top named U.S. TRI facility lead (parent-name match, unresolved)

This is a candidate facility lead from parent-name matching against 2024 U.S. TRI records, excluded from any owned/operated plant count until ownership and operating control are verified.

National TRI footprint (2024, aggregate across 19 matched facilities)

Facilities matched to Olin parent name 19

Total listed chemicals reported (aggregate) 224,941,415 lb

Recycled on- or off-site (aggregate) 115,180,577 lb · 51% of managed volume

Treated (aggregate) 80,357,642 lb

Energy recovery (aggregate) 28,555,485 lb

On-site release (aggregate) 333,527 lb

Off-site transfer (aggregate) 609,634 lb

PFAS-listed forms reported 0

Recycling is the single largest management category at 51% of the aggregate, consistent with closed-loop brine and chlorine-derivative recovery common at large chlor-alkali electrolysis complexes. Components are shown as reported and may not sum exactly to the published total due to EPA rounding or categorization conventions.

Process-chemistry signal

Hydrochloric acid as the top-reported chemical at a chlor-alkali and vinyls complex is consistent with normal co-product generation in chlorine and VCM manufacturing, not an anomaly requiring investigation.

Winchester scope note

Winchester’s ammunition-manufacturing facilities are regulated primarily through ATF federal firearms and ammunition licensing, not the EPA TRI chemicals-reporting program used for the rest of this brief; any Winchester-specific residual or material conversation requires separate evidence collection outside this source set.

Scope limitation

TRI parent-name matching only reaches U.S. facilities filed under an Olin corporate name and only covers the specific listed chemicals tracked in this source set, effectively the chemicals segments. It says nothing about Winchester’s separate manufacturing footprint or Olin’s operations outside the United States.

These are analytical hypotheses, not Olin-reported plans or projects. Olin’s investor overview identifies three business segments; the source does not establish facility-level material flows or sourcing opportunities.

Formalize & extend chlor-alkali brine recovery

A 51% TRI recycling share signals mature recovery infrastructure already in place at Freeport; the opportunity is documenting, benchmarking, and extending that infrastructure to remaining treatment and energy-recovery streams.

• Named site and brine/chlorine-derivative recovery process detail
• Current recovery-rate benchmarking vs. sector peers
• Customer-facing sustainability documentation

Lower-embodied-carbon epoxy formulations

Coatings and composites customers increasingly specify lower-embodied-carbon epoxy systems; Olin’s internal chlorine-to-epichlorohydrin-to-epoxy chain is a genuine, named feedstock pathway to evaluate.

• Named epoxy resin family and customer
• Lower-carbon feedstock or process qualification
• Mechanical and cure-performance equivalence data

Winchester brass & metal recovery (separate track)

Metal recovery is an analytical pathway to investigate, not an Olin-reported Winchester program; the sources retained here do not establish a facility, scrap volume, or recovery route.

• Named Winchester facility and brass-scrap volume
• Metal-recovery processor relationship
• ATF-compliant handling confirmation

Membrane-cell technology & mercury-legacy site verification

The sources retained for this page do not identify which Olin chlor-alkali sites use membrane-cell technology or establish site-specific conversion status.

• Named site and current cell technology
• EPA NESHAP mercury-cell phase-out compliance status
• Timeline to any remaining conversion

Priority opportunity

Evidence boundary: The cited investor overview names three business segments. It does not establish commercial or technical overlap, site-level flows, procurement owners, or active substitution projects.

Olin’s regulatory profile splits cleanly along its two business lines: EPA and TSCA chemicals rules for Chlor Alkali/Vinyls and Epoxy, and ATF firearms/ammunition regulation for Winchester, with essentially no shared framework between them.

Regulatory applicability has not been adjudicated per site or segment here. This is a watchlist, not a legal conclusion.

Certification & reporting families in play

Certificate scope and current status are not verified here. Certification-family relevance does not prove an active, in-scope certificate at any named site.

Innovation & capacity signals

Recovery infrastructure 51% matched TRI recycling share signals mature brine and chlorine-derivative recovery at the Chlor Alkali segment

Internal feedstock linkage Epoxy segment sources chlorine-chain intermediates (allyl chloride, epichlorohydrin) internally from the Chlor Alkali platform

Segment independence Winchester operates under an entirely separate regulatory, manufacturing, and commercial structure from the chemicals segments

This brief separates the disclosed record from the evidence still needed. Bring the relevant specification, facility or product-family evidence into the review.