** Regional lender KeyCorp's KEY.N shares rise as much as 3.4%; last up 2.4% to $15.52
** Company late Thursday announced $1 billion share repurchase program
** Bank intends to begin repurchasing shares in the second half of 2025 in the open market or in privately negotiated transactions
** Brokerage Stephens says it is encouraged by the buyback announcement, particularly given the recent decline in stock price and general economic concerns
** KEY stock down 9.5% YTD
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com))