Shipyards
Neptun Werft AG, Rostock
10 commissioned U-boats
| Type | Boats | Werk | Built during | |
| VIIC | U-921 - U-928 | 8 boats | 508 - 515 | 1941 - 1944 |
| VIIC/41 | U-929 - U-930 | 2 boats | 516 - 517 | 1942 - 1944 |
The first U-boat launched by Neptun Werft AG in Rostock was the U-921 on 3 Apr 1943, but the last U-boat launched was the U-927 on 3 May 1944. This refers to U-boats that were actually commissioned into the Kriegsmarine.
U-boats that had been laid down
The following boats were laid down but not finished by the yard:
U-931, U-932
U-boat ordered but not laid down by this yard
| Type | Boats | Werk | Ordered | Notes | |
| VIIC/41 | U-933 - U-936 | 4 boats | 524 - 527 | 1942 | |
| VIIC/42 | U-937 - U-942 | 6 boats | 529 - 534 | 1943 |


