One of the biggest mysteries in global finance was just revealed: How much U.S. debt Saudi Arabia owns. Saudi Arabia stockpiled $116.8 billion of U.S. Treasuries as of March, the Treasury Department announced on Monday, ending four decades of keeping the figure secret. That makes Saudi Arabia the 13th largest foreign holder of U.S. debt, though well behind the $1 trillion-plus owned by China and Japan each.

The Saudi figure was first reported by Bloomberg News based on a Freedom of Information Act request. Unlike with most other major owners of U.S. debt, the Treasury Department kept Saudi Arabia’s precise holdings secret since the 1970s. Saudi’s holdings were lumped together with that of other oil exporting nations, including Venezuela and Iraq. READ MORE