Tessenderlo Kerley, Inc. (TKI)

Tessenderlo Kerley, Inc. (TKI) produces and markets specialty chemical solutions, including fertilizers, crop protection chemicals and process chemicals and services to diverse markets around the world. TKI operates 11 manufacturing plants in North America in addition to an extensive terminal network. In 2017, TKI celebrates 70 Years of Growth. Tessenderlo Group is a worldwide specialty company, focused on food, agriculture, water management and on valorizing bio-residuals. The group employs about 4,900 people and is a leader in most of its markets, with a consolidated revenue of 1.6 billion EUR in 2016.

Company details

2255 North 44th Street, Suite 300 , Phoenix , AZ 85008-3279 USA

Locations Served

Business Type:
Industry Type:
Market Focus:
Globally (various continents)
Over 1000
10,000,000 - 100,000,000 €

TKI at a Glance
Unified by one value system, the diverse business units and services within TKI serve the agriculture, mining, industrial and water reclamation markets with a broad range of products and technologies around the world.

More than six decades after our company was founded, the cornerstone of our many different operations is to conduct business in a way that is safe for our employees and customers while being environmentally friendly.

Responsible stewardship is integrated into every aspect of our businesses.

Many TKI products create significant opportunities to conserve water in the process of fertilizing and protecting crops. Other TKI products can be used for the same purposes that make it possible to eliminate the use of cyanide and other environmentally unfriendly chemicals.

While assessing ways to minimize any environmental or safety impact of our products, we have ongoing and mandatory internal initiatives to focus on safety during every step – from manufacturing to transportation to product use in the field.

TKI participates in the sustainable and legislative initiatives undertaken by a number of trade associations, including CropLife America, The Fertilizer Institute and global sustainability initiatives sponsored by The Sulphur Institute. Our parent company represents all TKI business units in its support of the global Responsible Care initiative sponsored by the International Council of Chemical Associations.

Crop Vitality Products Align With 4r Nutrient Management

Numerous industry organizations working in partnership with global food retailers and distributors are advocating for greater nutritional stewardship in agriculture.

Many of these organizations have introduced precision agriculture programs like the 4Rs. The 4R Nutrient Stewardship model provides a framework to achieve cropping system goals, such as increased production, increased farmer profitability, enhanced environmental protection and improved sustainability. With Crop Vitality products customers can apply the right fertilizer at the right time, rate, source and place.

Today’s Tessenderlo Kerley is the descendent of The Kerley Chemical Company, founded by four brothers who recognized a growing demand for sulfur plant nutrition in Pecos, Texas, shortly after the end of World War II. The Kerley Brothers developed a unique process for manufacturing sulfur-based liquid fertilizers that are safe, easy to handle and can be applied through irrigation equipment. In the early 1950s, Kerley Chemical opened retail stores and began selling fertilizers to farmers, retailers and distributors throughout the western United States and midwestern corn belt.

Acquisitions, ownership changes and growth guided the company through the years, while TKI established itself as a leader in the production and marketing of specialty products used in the agriculture, mining and process chemical industries.

TKI is now the world’s largest producer of sulfur-based thiosulfate fertilizers.


The company formed a joint venture with refinery giant Phillips 66 in 1986. At two key refining facilities, TKI processes 100 percent of the hydrogen sulfide gas generated at the plant, and the working relationship is ongoing.


In 1988, Hickson International PLC acquired Kerley. Then, in 1995, Belgium-based Tessenderlo Chemie acquired the Kerley business without changing the company’s focus on processing refinery byproducts into added value chemicals. Since then, the company has been operating as Tessenderlo Kerley, Inc., or TKI.

TKI acquired the Mobile Process Resources (MPR) company in 1999, which had technology to assist oil refineries with providing a more efficient way to operate equipment that separates gases in the refining process.

Now, MPR provides both mobile and permanently installed, technically advanced equipment for the cleaning and recovery of gasses around the world. MPR has expanded these technologies to have applications in gas plants, ammonia plants, steel manufacturing and LNG facilities.


Specializing in niche agricultural markets globally, NovaSource serves the Crop Protection market delivering high value agricultural herbicides, and fungicides, turf and ornamental fungicide, fumigants, insecticides and heat stress protection products.

This TKI business unit continues to selectively expand and add proven labeled products to its portfolio, and has been a key area of growth and investment for TKI in recent years.


TK Formulators (formerly Ag Formulators), which provides toll processing formulation services and secure warehousing to customers in the San Joaquin Valley of California and beyond, became part of TKI in 2007 through acquisition.


In 2008, TKI acquired the assets, and marketing and distribution channels of Agrochem, based in Izmir, Turkey. Agrochem had been a key distributor for TKI in the area for the previous 14 years and had been manufacturing TKI plant nutrient solutions.


Environmentally Clean Systems LLC (ECS) was formed as a joint venture between MPR and Jet Oil Solutions in 2010 to serve the oil and gas industries. ECS provides water reclamation for produced water, flow back water and black water – tailoring technologies that reduce or eliminate the use of reagents and equipment associated with chemical systems of wastewater treatment.


By late 2014, the TKI Mining & Industrial business unit began operations of a new, environmentally safe thiosulfates production facility on the site of a mining operation owned by Barrick Gold Corporation, the global leader in gold production.

TKI has corporate headquarters based in Phoenix, Arizona and 10 manufacturing plants located throughout the United States. The company is a leader in most of its markets and our products are used in 44 countries around the world. TKI also has sales offices in Mexico and Chile and a network of sales representatives throughout Central and South America.