** Shares of AI software firm Dynatrace DT.N up 8.4% at $38.60 premarket
** Activist investor Starboard Value has taken a major stake in co and is pushing for changes to boost its share price, the Wall Street Journal reported on Monday, citing a draft of a letter by a senior executive
** Starboard believes DT's stock is undervalued compared to its peers and has been engaging with the co's leadership privately in recent months - WSJ
** WSJ report says the activist investor is pushing for an accelerated share buyback program and believes DT could return more than $2.5 bln to shareholders within three years
** Reuters could not immediately verify the WSJ report
** As of last close, DT stock down 17.8% YTD
(Reporting by Tharuniyaa Lakshmi in Bengaluru)
((tharuniyaa@thomsonreuters.com))