** Shares of Atlantic Union Bankshares fall 4.92% to $36.90

** Co to acquire Sandy Spring Bancorp in an all-stock deal worth $1.6 bln

** Sandy Spring shareholders to receive 0.90 shares of Atlantic Union common stock, representing a 7.1% premium to Sandy Spring's last close

** Deal to create the largest regional bank headquartered in the lower Mid-Atlantic with $39.2 bln in assets

** 3 of 4 brokerages covering the stock rate it "buy" or above, and 1 "hold"; their median PT is $43.00

** As of last close, stock up ~1.26%, YTD

(Reporting by Ankita Bora in Bengaluru)

((Ankita.Bora@thomsonreuters.com;))