** Airtasker ART.AX rises as much as 4% to A$0.39; marks biggest percent gain since September 18

** Online marketplace for local services says its unit has expanded media partnership with Channel 4, providing 2.5 mln pounds ($3.4 mln) in media inventory to accelerate growth in UK

** Adds in June 2028, co has right and obligation to repurchase all equity held by Channel 4 in Airtasker UK

** YTD, ART down 18.3%

($1 = 0.7452 pounds)

(Reporting by Keshav Singh Chundawat in Bengaluru)

((Keshav.singhchundawat@thomsonreuters.com))