Abdulalazim Ahmed, 18, of Washington Road, Portsmouth, has been charged with Section 18 Grievous Bodily Harm with intent.
On arrival, a 17-year-old-boy was located with a stab wound to his chest. He was taken to Southampton General Hospital where he remains in a stable condition.
Officers arrested a further six people in connection with this incident. A 19-year-old man from Southsea and a 20-year-old man from Croydon were arrested on suspicion of Section 18 Grievous Bodily Harm with intent.
An 18-year-old man from Southampton, an 18-year-old man from Southsea, a 20-year-old man from Southsea and a 17-year-old boy from Brixton were arrested on suspicion of Section 18 wounding with intent.
They have all been released under investigation while our enquiries continue.