| Name | Date | Operated by: |
|---|---|---|
| Clinton Laboratories | 1/1943 - 6/30/1945 | E. I. DuPont de Nemours for The University of Chicago |
| Clinton Laboratories | 7/1945 - 12/1946 | Monsanto Chemical Co. |
| Clinton Laboratories | 1/1/1947 - 2/28/1948 | Atomic Energy Comm. |
| Oak Ridge National Laboratory | 3/4/1948 | Carbide & Carbon Chemicals Co., Union Carbide Corp. |
| Oak Ridge National Laboratory | 1950 | Carbide & Carbon Chemical Division, UCC |
| Oak Ridge National Laboratory | 1956 | Union Carbide Nuclear Co., Division of UCC |
| Oak Ridge National Laboratory | 1964 - 1974 | Union Carbide Nuclear Corporation, Nuclear Division |
| Holifield National Laboratory | 1975 | Union Carbide Corporation, Nuclear Division |
| Oak Ridge National Laboratory | 1976 - 3/30/1984 | Union Carbide Corporation, Nuclear Division |
| Oak Ridge National Laboratory | 4/1/1984 - 12/31/1994 | Martin Marietta Energy Systems, Inc. |
| Oak Ridge National Laboratory | 1995 | Lockheed Martin Energy Systems, Inc. |
| Oak Ridge National Laboratory | 1/1/1996 - March 31, 2000 | Lockheed Martin Energy Research, Inc. |
| Oak Ridge National Laboratory | 4/1/2000 - Present | UT-Battelle |