A 24-year-old man remains in Southampton General Hospital in a critical condition after suffering head injuries.
It follows an altercation just after midnight on 26th July near to the Vodafone store on the High Street.
A 26-year-old man, who was the third to be arrested in connection with the incident, was released on conditional bail yesterday, 28th July.
Two others, aged 25 and 20, were also released on conditional bail previously.
All three are from Alton and were arrested on suspicion of causing grievous bodily harm with intent.
Anyone with information is asked to contact 101, quoting Operation Infringe or 44200279176.