Closely follows secret banking information?

• Dramatic drops
• Sudden declines
• Barnstormers' stunts
• Uncontrollable drops
• Dramatic descents
• Sudden downturns, and a literal hint to this puzzle's circles
• Sudden collapses
• Rapid plunges
• Rapid descents

Wiktionary Word definitions in Wiktionary
n. (plural of tailspin English)