Dark-haired Joanne, 44, was last seen on 5 December 2019 when she travelled back to Southampton from Fareham with a friend.
Although a body has not been found in the hunt for the 'approachable' and 'full of joy' Joanne, police have launched a murder investigation.
Officers from Hampshire Constabulary's Major Crime Team took into custody three men on Monday - a 50-year-old and 63 year old man from Southampton and a 29-year-old man from Basingstoke, Hants.
All three men have been arrested on conspiracy to murder.