** Shares of Australia's Whitehawk WHK.AX rise as much as
20% to A$0.018, marking their biggest intraday pct gain since
March 4
** Stock hits its highest level since May 21
** Online cybersecurity exchange co signs contract with
Australian bookmaker Tabcorp Holdings TAH.AX
** Co would monitor cyber risks to TAH revenue under first
cyber risk programme contract
** About 11.1 mln shares change hands by 0148 GMT, vs the
30-day average volume of 1.4 mln shares
** WHK stock down 37.5% YTD, as of last close
(Reporting by Roshan Thomas in Bengaluru)
((Roshan.Thomas@thomsonreuters.com))