** London Stock Exchange Group LSEG.L up 4.1% to 8,116 pence; among top gainer on FTSE 100 .FTSE index, which is down 0.17%
** Co plans to buy back additional 3 billion pounds ($4.06 billion) of shares over next 12 months amid pressure from activist investor Elliott Management
** Expects 2026 total income to grow between 6.5% and 7.5% on organic constant currency basis, excluding recoveries, vs analysts estimate of ~6.7% growth, per company poll
* Reuters provides news for LSEG's news and data terminal Workspace
** LSEG has fallen more than 26% in last 12 months
($1 = 0.7382 pounds)
(Reporting by Raechel Thankam Job in Bengaluru)
((RaechelThankam.Job@thomsonreuters.com))