Tessenderlo Kerley (TKI)
Agriculture Phoenix, AZ · Private
Subsidiary of Tessenderlo Group
Tessenderlo Kerley is a specialty sulfur-based chemical manufacturer with a robust North American footprint across 11 production and R&D facilities, primarily serving agriculture with branded fertilizer products. The company maintains a stable operational presence as the North American subsidiary of Belgium-based Tessenderlo Group.
Tessenderlo Kerley, Inc. (TKI) produces and markets specialty sulfur-based chemical solutions for agriculture, including liquid fertilizers (Thio-Sul, KTS, K-Row 23), crop protection products, and process chemicals for mining, water treatment, and industrial markets. It is the North American subsidiary of Belgium-based Tessenderlo Group.
Employees
450
Mfg Plants
10
All Facilities
12
Activity
3/10
Type
Private
Plant Locations (12 mapped)
0
Recent News
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Manufacturing Plants (10)
Tessenderlo Kerley Fresno Plant
Fresno, CA
Formulation and packaging of insecticides, herbicides, and fungicides; wettable powders, liquids, flowables, and dry blends
Tessenderlo Kerley Hanford Plant
Hanford, CA
Liquid fertilizer and crop protection manufacturing; solar-powered facility; achieved Cal/OSHA VPP STAR safety recognition
Tessenderlo Kerley East Dubuque Plant
East Dubuque, IL
Liquid fertilizer manufacturing including Thio-Sul for Crop Vitality; opened 2017
Tessenderlo Kerley Coffeyville Plant
Coffeyville, KS
Liquid fertilizer mixing and rail loading; produces Thio-Sul and related products
Jupiter Sulphur LLC (Billings) — operated by TKI
Billings, MT
Sulfur recovery plant co-located with Phillips 66 refinery; operated by Tessenderlo Kerley; 35+ years of operations
Tessenderlo Kerley Carlsbad Plant
Carlsbad, NM
Sulfur recovery and ASME Code fabrication; serves mining, oil & gas, and water treatment markets; 40+ years of operations
Tessenderlo Kerley Elko Plant
Elko, NV
Process chemicals for mining industry; includes CaTS thiosulfate facility for Barrick Goldstrike Mine north of Elko; exact street address not publicly confirmed
Tessenderlo Kerley Defiance Plant
Defiance, OH
Newest TKI facility; opened August 2025; 50-acre site producing Thio-Sul, KTS, and K-Row 23 liquid fertilizers
Tessenderlo Kerley Wynnewood Plant
Wynnewood, OK
Converts sulfur byproducts from CVR Energy refinery into Thio-Sul fertilizer and ABS (ammonium bisulfite) for moleko water treatment product
Tessenderlo Kerley Kennewick Plant
Kennewick, WA
Agricultural and water treatment chemical manufacturing in the Columbia Basin region
Other Facilities (2)
Tessenderlo Kerley HQ
Phoenix, AZ · hq
North American headquarters; customer support and corporate offices
Crop Vitality Learning Center (Dinuba)
Dinuba, CA · r&d
Research farm and learning center for Crop Vitality brand; agronomy demonstration and R&D