Robinhood, the popular American stock brokerage application, soared 36% this Thursday in electronic operations after the closing of Wall Street after learning that a cryptocurrency entrepreneur acquired 7.6% of its shareholding.

In a document delivered to the US Securities and Exchange Commission (SEC), Robinhood revealed a joint "investment" by Samuel Bankman-Fried, CEO of the cryptocurrency platform FTX, and Emergent Fidelity Technologies, of l