| Navy | The Royal Navy |
| Type | MS Whaler |
| Class | [No specific class] |
| Pennant | FY 1725 |
| Built by | Smiths Dock Co., Ltd. (South Bank-on-Tees, U.K.) |
| Ordered | |
| Laid down | |
| Launched | 11 Jul 1930 |
| Commissioned | Nov 1940 |
| Lost | 29 May 1944 |
| History | Norwegian whaler of Hvalfangerselskap Kosmos A/S (Anders Jahre), Sandefjord, Norway taken over by the Admiralty in November 1940. Renamed HMS Firmament in September 1941. HMS Firmament (T/Skipper J. Muttitt, RNR) stranded off Alexandria, Egypt on 29 May 1944 and lost. |
Commands listed for HMS Kos IX (FY 1725)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | T/Skr. Gilbert Parkinson, RNR | 9 Apr 1942 | Apr 1943 |
| 2 | T/Skr. John Muttitt, RNR | Apr 1943 | 30 May 1944 |
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