This article explains everything!

“As strange as it may sound, the ratio of index to ring finger correlates with traits such as spatial ability, risk-taking, and assertiveness. It’s connected to success in competitive sports like soccer and skiing. Rustichini’s own work has connected it to real-life success, such as the profitability of London high-frequency financial traders.

Sure enough, their analysis of the photos found that the more successful the entrepreneur, the longer the ring finger compared to the index finger. The most successful entrepreneurs had ring fingers 10% to 20% longer than their index finger.”

Here’s my hand:

 Here’s my recent stack:

Turns out it’s all scientific!