Stock-trading app Robinhood could be valued at $5.6 billion when it closes an upcoming fundraising round, according to a Thursday report in The Wall Street Journal.

According to The Journal's sources, the funding round is being led by Russian billionaire Yuri Miller's investment firm, DST Global.

DST Global led Robinhood's previous funding round in 2017.

Popular zero-fee trading app Robinhood could be valued in excess of $5 billion dollars — a huge increase over its previous $1.3 billion valuation in 2017 — when it closes a fundraising round that's currently in the works, according to The Wall Street Journal.

The five-year-old company is finalizing a new funding round led by DST Global, the firm led by influential Russian billionaire Yuri Miller, The Journal reports, citing anonymous sources. The firm led the company's previous funding round in 2017, which was the first time Robinhood was valued at over $1 billion.

Robinhood gained notoriety early on its for its straightforward design and zero-fee trading, which recently expanded to include cryptocurrencies like bitcoin, ethereum, and litecoin.

A preview of Robinhood's cryptocurrency feed. Robinhood

In addition to fundraising talks, Robinhood has received other interest from investors recently as well. On Wednesday, the company announced that Greylock investor Josh Elman would be joining Robinhood in a senior position. In a statement to Recode, Elman described Robinhood as "hyper-growth company."

Robinhood's reported $5.6 billion valuation would place it ahead of its rival platform, Coinbase, which was most recently estimated to have a $3.2 billion valuation.