** Regional lender HomeStreet's shares fall as much as 5.1%, last down 1.9% at $10.88 in early trading

** Peers FirstSun Capital Bancorp and HMST have mutually agreed to terminate their buyout deal, the companies say

** FSUN shares up 1.4% at $36.90 in early trading

** In January, FSUN had agreed to buy HMST for $14.75/share, which was revised to $13.53/share in May

** Deal failed to secure the necessary regulatory approvals, the companies had said last month

** As of last close, HMST shares up 7.6% YTD

(Reporting by Arasu Kannagi Basil in Bengaluru)

((ArasuKannagi.Basil@thomsonreuters.com;))