Lost between 26 JUN 1943 and 04 JUL 1943 with the loss of 78 officers and men. USS RUNNER was on her third war patrol and is presumed to have struck a mine.
Prior to her loss, she reported sinking a Japanese freighter, the Seinan Maru, on 11 JUN 1943 and a passenger-cargoman, Shinryu Maru, off the Kurile Islands on 26 JUN 1943, so the USS RUNNER was lost between then and 24 JUL 1943, when she was scheduled to return to Midway.