Fahad Mohamed Nur, 18, was found near Cathays train station in Cardiff at about 00:30 BST on 2 June.
He was taken to the city’s University Hospital of Wales where he died.
The inquest in Pontypridd was opened and adjourned. Criminal proceedings are set to take place, with three men charged with murder and due to stand trial.
Det Insp Stuart Wales told the inquest a post-mortem examination showed the cause of death was a stab wound to the heart.
Mr Nur was born in Mogadishu, Somalia, and lived with his parents and siblings in the Cathays area of Cardiff.
Pontypridd Corner’s Court heard emergency services were sent to the lane between Corbett Road and Park Place after Mr Nur was found.
“Several witnesses provided help to Fahad and called an ambulance,” said Det Insp Wales.
“A post-mortem showed he had suffered multiple sharp-force injuries.”
Mr Nur’s body was formally identified by his mother at about 11:30 that morning, he added.
Shafiqur Shaddad, 24, of Butetown, Mustafa Aldobhani, 21 and Abdulghalil Aldobhani, 22, of Cathays, have been charged with murder.
They are due to stand trial on 18 November.
Aseel Arar, 34, of Selly Oak, Birmingham, is charged with assisting an offender.
Coroner Rachel Knight suspended the inquest until after the trial.
South Wales Police are appealing for help in their search for the murder weapon and clothing worn by those responsible.
Det Chief Insp Mark O’Shea said: “We believe that a knife or possibly two knives were used and are keen to hear from anyone who has information on where they might be.
“We are also appealing for any sightings of the suspects before or after the incident, and any vehicles they may have used.”