The Robinhood website home screen on a smartphone.
Gabby Jones | Bloomberg | Getty Images
Restrictions on Robinhood traders are still tight and getting tighter throughout the day on Friday, now only allowing GameStop holders to buy a single additional share.
The stock trading app has also expanded its list of restricted stocks from 13 earlier in the day to 50. With less than a half-hour left of trading the list grew from 23 companies to 50.
The restricted list tells clients how many shares and options contracts they can buy pertaining to a particular security. Robinhood customers holding GameStop can only buy one share and up to five options contracts.
The stock, which is up 50%, is well off…