Key Players
Competitive Landscape
The ammonium thiosulfate field splits among integrated crop-nutrition groups, sulfur-processing operators, regional liquid-fertilizer manufacturers and development-stage project sponsors. Each model competes on a different combination of sulfur access, storage infrastructure and proximity to seasonal agricultural demand.
Recent investment has moved toward new liquid-fertilizer capacity and more disciplined plant operations. Tessenderlo Kerley opened its Defiance, Ohio liquid-fertilizer facility in August 2025. Koch Fertilizer reported five 2025 ENERGY STAR plant certifications in April 2026 and identified ammonium thiosulfate among Brandon’s upgrade products. Current competition therefore turns on physical availability and the operating controls that protect seasonal deliveries.
Company developments mapped to drivers, trends and opportunities (2026-2036)
| Development | Driver | Trend | Opportunity |
|---|---|---|---|
| TIB Chemicals completed the REAXIS integration under the TIB Chemicals Corporation name in December 2025. | North American specialty-chemical customers gained a closer group operating presence for technical and commercial support. | European sulfur-chemical groups are extending regional operating presence after acquisition activity. | TIB can shorten response times for USA accounts that require sulfur-chemicals support. |
| Delek US filed its first-quarter Form 10-Q in April 2026 and continued to list ammonium thiosulfate among Krotz Springs refinery products. | Refinery sulfur processing gives fertilizer channels an ATS source outside dedicated fertilizer plants. | Refinery-linked ATS remains part of USA supply beside specialist fertilizer producers. | Gulf Coast output can serve liquid-fertilizer channels that value nearby bulk availability. |
| Central Platte NRD approved construction-well and rail-building easement requests for J Westling’s Meadowlark fertilizer project in July 2026. | The project requires local water and rail infrastructure before planned fertilizer capacity can enter service. | New USA liquid-fertilizer capacity is advancing through site infrastructure and utility approvals before plant construction. | Regional distributors could gain another domestic ATS source if Meadowlark reaches commercial operation. |
Tessenderlo Group NV, Koch Fertilizer LLC, Martin Midstream Partners L.P., Hydrite Chemical Co. and Poole Chemical Co., Inc. compete through production, storage or regional fertilizer access outside the three developments mapped above.
Source: Future Market Insights, Ammonium Thiosulfate Market and Liquid Fertilizer Market Reports, 2026-2036.
Together these companies cover specialist ATS manufacturing, refinery-linked production, Gulf Coast sulfur processing, liquid-fertilizer distribution and planned Midwestern capacity.
Who leads the ammonium thiosulfate market?
Tessenderlo Group NV and Koch Fertilizer LLC show the broadest documented combination of ATS production routes, liquid handling and crop-nutrition reach within this profile.
Which suppliers have documented qualification or quality approvals?
Koch Fertilizer holds current ENERGY STAR plant certifications, while Phillips 66 Company operates its Billings sulfur-recovery complex under renewed Montana air permits.
Which companies provide fertilizer products?
Koch Fertilizer LLC and Hydrite Chemical Co. serve field-facing fertilizer channels, while Martin Midstream Partners L.P. produces liquid plant-nutrient ATS for direct use or blending.
Which suppliers serve North America and Europe?
Tessenderlo Group NV serves North American and European crop-nutrition routes, while TIB Chemicals AG expanded its North American operating presence through the REAXIS integration.
Representative Company Overview
| Company | Positioning | Verified Development |
|---|---|---|
| Tessenderlo Group NV | Integrated crop-nutrition group with established thiosulfate fertilizer operations in North America and Europe. | In August 2025, Tessenderlo Kerley opened a new liquid-fertilizer production facility in Defiance, Ohio. |
| Koch Fertilizer LLC | North American fertilizer producer with ATS manufacturing capability and bulk liquid distribution infrastructure. | In April 2026, five Koch Fertilizer plants received 2025 ENERGY STAR certification; the same release identifies ATS among Brandon’s upgrade products. |
| Martin Midstream Partners L.P. | Gulf Coast sulfur processor whose Neches terminal produces ATS for Mid-South and Southeastern USA fertilizer channels. | In July 2026, Martin Midstream filed its second-quarter Form 10-Q covering its sulfur-based products business. |
| TIB Chemicals AG | European specialty-chemical producer with sulfur-chemicals operations and a North American corporate presence. | In December 2025, TIB announced completion of the REAXIS integration under the TIB Chemicals Corporation name. |
| J Westling & Co. | Development-stage fertilizer project sponsor planning integrated UAN and ATS capacity in Gothenburg, Nebraska. | In July 2026, Central Platte NRD approved a construction well and rail-building easement requests for the Meadowlark fertilizer project. |
| Delek US Holdings, Inc. | Refinery operator whose Krotz Springs, Louisiana refinery lists ammonium thiosulfate among its primary products. | In April 2026, Delek US filed its first-quarter Form 10-Q and continued to identify ATS among Krotz Springs refinery products. |
| Poole Chemical Co., Inc. | Regional liquid-fertilizer producer whose Texline, Texas facility processes ammonium thiosulfate solution. | In 2025, Poole Chemical filed a TCEQ New Source Review permit-renewal application for continued operation of its ATS processing facility. |
| Hydrite Chemical Co. | USA sulfur-chemistry producer with ammonium thiosulfate manufacturing and agricultural distribution routes. | In September 2025, Hydrite acquired Enterprise Specialty Products and expanded its corporate operating presence into the USA Southeast without stating an ATS capacity addition. |
Research Methodology
The companies mapped here illustrate the market structure rather than an exhaustive ranking. Inclusion requires current verifiable evidence that a company produces, distributes or is developing ammonium thiosulfate within the defined market scope. Evidence comes from regulator approvals, company announcements and public filings. Capabilities are attributed to the stated ATS operation or fertilizer business rather than generalized to broader corporate portfolios. Market-share estimates remain proprietary FMI assessments for the forecast period.
