** Shares of Australia's GR Engineering Services GNG.AX fall as much as 12.8% to A$4.57, posting their biggest intraday pct drop in more than a year

** The engineering consulting and contracting firm posts HY26 EBITDA of A$27.8 million ($19.54 million), down from A$34.5 million a year earlier

** Co logs HY26 revenue of A$218 million, down from A$272.1 million last year

** However, co increases interim dividend to 12 Australian cents/share from 10 Australian cents/share last year

** Stock up 7.3% YTD

($1 = 1.4227 Australian dollars)

(Reporting by Aamir Sheik Khalid in Bengaluru)

((Aamir.SheikKhalid@thomsonreuters.com))