** Shares in shipping services firm Clarkson CKN.L down as much as 18.37% at 3,751 pence; biggest intraday loss since May 2018
** Stock lowest since Nov 1, 2024; top pct loser on FTSE Midcap .FTMC index
** Co flags uncertainty around demand trends and impacts from heightened geopolitical uncertainty in near term
** Warns that if uncertainty continues, it may affect the group's performance
** Stock down about 1.9% in the last 12 months
(Reporting by Judes Joseph in Bengaluru)
((judes.joseph@thomsonreuters.com;))