HST LLANELLI - IMO 9921594- 
| Name | : | HST LLANELLI |
| Former names | : | WEM 4 (2021-2023) |
| IMO number | : | 9921594 |
| Type | : | High speed craft / crew transfer vessel, wind farm support vessel |
| Built | : | 2021 |
| Length | : | 27,1 m |
| Beam | : | 8,9 m |
| Draught | : | 1,6 m |
| Speed | : | 21 knots, 23,5 knots max. |
| Bollard Push | : | 12 t |
| Capacity | : | 24 seats / crew 4 |
| Operator/owner | : | Purus - High Speed Transfers Ltd, Swansea - United Kingdom |
| Flag | : | United Kingdom |
| Port of registry | : | Swansea |
| Extra information | : | Purus Marine has acquired HST Marine. Purus Marine Head Quarter: London |
