American Express’ (AXP) GBT to Go Public at a Valuation of $5.3B Posted byZacks Equity Research December 6, 2021 Leave a comment on American Express’ (AXP) GBT to Go Public at a Valuation of $5.3B American Express’ (AXP) GBT is likely to merge with a blank-check company supported by Apollo Strategic Growth Capital. The transaction is likely to close in first-half 2022.