** Shares of Australia's Kogan.com KGN.AX fall 11.7% to A$3.99, lowest since April 9

** Stock set for biggest single-day drop since Jan 24

** KGN, which manages a portfolio of retail and services businesses, reports revenue fell 0.7% in first four months of H2FY25

** Co's adjusted EBITDA slumps 37.5% to A$6.8 mln ($4.37 mln)

** Stock down about 32% YTD

($1 = 1.5567 Australian dollars)

(Reporting by Rishav Chatterjee in Bengaluru)

((Rishav.Chatterjee@thomsonreuters.com;))