** Software company Zendesk Inc's shares ZEN.N up 5.69% at
$128.62
** Co has hired advisory firm Quatalyst Partners to explore
a potential sale, sources told Reuters urn:newsml:reuters.com:*:nL3N2WG2Z5
** In February, ZEN rejected acquisition offer from private
equity consortium for $16 bln urn:newsml:reuters.com:*:nL4N2UL474
** Co's investors in Feb also rejected proposed $4 bln
takeover of SurveyMonkey parent Momentive Global MNTV.O ,
terminating merger agreement deemed likely to be too risky
** ZEN's shares up 14.61% YTD
(Reporting by Sonia Cheema)
((Sonia.Cheema@thomsonreuters.com))