HSC Speedrunner IV is a fast ferry owned and operated by Aegean Speed Lines. She is used on a service between Piraeus, Serifos, Sifnos and Milos. She was built in 1999 at Fincantieri, Riva Trigoso, Italy, for Sea Containers Ltd, but entered service only in 2000 for Sea Container's subsidiary Silja Line. In 2006 she was transferred to another Sea Containers subsidiary, SuperSeaCat. In 2009 she began service with her current owners.