Hepsiburada is one of the Turkey's largest e-commerce platform that allows consumers to order items ranging from groceries and essentials to airline tickets with nine million active customers.
The online brokerage needed funding to sustain a surge in trading in GameStop and other talked-up stocks.
Robinhood and other brokerages took steps to stop the buying frenzy surrounding firms such as GameStop but only sparked more volatility in the market, with angry customers and politicians arguing the curbs unfairly benefit bigger investors.
Lawsuit filed in the US District Court of New York says Robinhood's decision to block trading of GameStop stocks "deprived retail investors of the ability to invest in the open-market."
A rally fueled by social media users has left established funds reeling under losses.
Social media company loses $120 billion in market value in a biggest one-day wipeout in the US stock market history.
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