It was first reported in April that the label had dropped the former 26-year-old 'X Factor' winner, but Arthur has denied any split before now, reported Digital Spy.
"Just to clear things up - I am no longer with Syco. I would like to thank all at the label for making a great record with me," Arthur tweeted.
"I now have to move on and do something different - the future is bright! #LOVE."
The singer had reiterated at the end of May that he was unaware of any split with the label.
Cowell has previously said that Arthur should "shut up and just put the records out".
Arthur made one self-titled album with Syco, reaching number two in the UK album charts.
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