Mark Kinson, 52, was last seen on Friday January 31, at 9.45pm on Uphill Road, Llanrumney.
He was then seen at around 10pm in the Captains Walk walking in the general direction of Braunton Crescent.
Extensive enquiries have been carried out, and these are continuing, to locate Mark but there have been no confirmed sightings since that day.
As part of the on-going investigation, officers have examined CCTV footage and searching open land, wooded areas, and riverbanks.
Mark is described as around 5ft 7ins tall and was wearing a dark grey/blue tracksuit on the day he went missing.
Anyone who may have seen Mark, or who has information which will help us find him, is asked to contact us quoting occurrence number 2500033949.
Live Chat https://www.south-wales.police.uk/
Contact us via https://bit.ly/SWPProvideInfo
Call 101 or Crimestoppers anonymously on 0800 555 111.
Always call 999 in an emergency.
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