** Shares of Australia's Amaero 3DA.AX tumble 20% to A$0.26, their steepest decline since March 20, 2023
** Alloy producer reduces FY26 revenue guidance to between A$18 million ($12.03 million) and A$20 million, down from A$30 million to A$35 million
** 3DA top loser in the all ordinaries index .AORD
** Stock added 10% in 2025, and is down 5.5% YTD
($1 = 1.4961 Australian dollars)
(Reporting by Shruti Agarwal in Bengaluru)
((Shruti.Agarwal@thomsonreuters.com))