A while back, a number of FOIA requests were submitted to the FBI for Koch related topics such as political groups and companies they owned. The proxy submitter passed them on to me. I have produced stories regarding the Aspen Institute and the Flint Hills Resources. Below is a list of Koch related firms that did not (at the time) have FBI files. I have uploaded copies of the letters for confirmation.
Wood River Oil and Refining Company
Matador Cattle Company
Patients United Now
Competitive Enterprise Institute
Citizens For a Sound Economy
Institute For Human Studies
Americans for ProsperityKoch-Related, FBI Final Response Letters