The company announced yesterday that the work force reduction started in November.
More than 2,000 people work at Koch's headquarters in northeast Wichita.
Spokeswoman Melissa Cohlmia blamed the cuts on the "current economic environment'' and decreased demand for Koch's products, which include petroleum, chemicals and paper products.
Cohlmia said Koch doesn't have a hiring freeze and noted about three dozen openings are posted on the company's Web site.
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