AST SpaceMobile Announces Proposed Private Offering of $1.0 Billion of Convertible Senior Notes Due 2036

I am too regarded to understand why the stock dumped 10% after hours, please explain

[AST SpaceMobile Announces Proposed Private Offering of $1.0 Billion of Convertible Senior Notes Due 2036](https://finance.yahoo.com/news/ast-spacemobile-announces-proposed-private-215500825.html)