** Integrated Research IRI.AX plunges as much as 19.4% to 3-week low of A$0.395
** Stock marks biggest intraday pct drop since December 23, 2024
** Software firm expects full-year EBITDA of A$15 mln ($9.7 mln)-A$17 mln, lower than year-ago A$24.6 mln
** Sees 19%-21% decline in FY total contract value, with 17%-20% drop in annual statutory revenue
** Says sustained market uncertainty throughout year delayed anticipated business opportunities into FY26
** IRI last down 15.3%, takes YTD losses to 7.8%
($1 = A$1.5408)
(Reporting by Ananya Verma in Bengaluru)
((Ananya.Verma@thomsonreuters.com;))