The U.S. shares you hold in your Superhero Account are held by Apex Clearing Corporation LLC (Apex) on your behalf as custodian.
Apex does not acquire a beneficial or proprietary interest in your securities or cash, or the income and rights attached to your securities.
For clarity, beneficial ownership means that you, the owner of the shares, gets the direct benefit from the shares. Direct benefits include dividend payments, capital gains, etc.
The shares purchased within your Superhero account are yours and cannot be accessed by others, including claims from any creditors of Superhero or Apex.
Please see Safety of Customer Assets at Apex Clearing Corporation document