[8] In March 2009, the parent company, Union Bankshares Corporation, announced a merger plan with First Market Bank, FSB.

[11] In March 2010, the holding company merged its original subsidiary Union Bank and Trust Co., founded in Bowling Green, Virginia in 1902, into FMB.

[20] In 2019, the bank created a division focused on financing for commercial equipment,[21] and donated a building acquired in the 1990s to the town of Bowling Green.

The venue was previously called the Union Bank & Trust Center as part of a ten-year name sponsorship agreement worth $2.25 million.

[37] Atlantic Union Bank has also funded grants allowing community groups and non-profit organizations to hire summer interns.

[38] Atlantic Union agreed to buy Maryland-based Sandy Spring Bancorp for $1.6 billion in an all-stock transaction in October 2024.