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, 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 -
No other U-boat contracts signed by this yard.

