A new regulatory filing with the Securities and Exchange Commission (SEC) indicates that Cameron and Tyler Winklevoss are planning to have their Winklevoss Bitcoin Trust exchange traded fund (ETF) listed on the NASDAQ stock exchange.

If the SEC gives its final approval, investors will be able to buy into the fund and participate by owning "shares" of bitcoins.

The filing is an amendment to a series of documents that the ETF has submitted to the SEC in order to get the fund off the ground. It was initially registered with the SEC last July.

The Winklevoss Bitcoin Trust would be the first publicly-listed bitcoin ETF. The trust is owned by Math-Based Asset Services, LLC, an entity set up by the Winklevoss twins.

According to the SEC filing, the ETF is expected to IPO for 1m total shares. Each share is worth one-fifth of a bitcoin, which would mean that the trust controls 200,000 BTC and at recent prices would be worth roughly $87 per share.

Selling "shares" of bitcoin on the open NASDAQ market would provide investors improved access to bitcoin-based assets.

New York City-based SecondMarket operates a bitcoin investment trust. However, that fund is currently restricted to accredited investors.

The Winklevoss brothers, who had an early hand in the conception of Facebook, have been bullish advocates of bitcoin for some time. They indicated last year they expect BTC to hit $40,000 per coin in the future.

The Winklevosses revealed their bitcoin investment last year, reportedly owning 1% of all bitcoins in circulation. Based on the digital currency's  total market cap, that would mean the twins jointly own over $50m in BTC.

The brothers have been publicly stumping for the positive virtues of the virtual currency industry. They have appeared on CNBC and testified earlier this year in front of the New York Department of Financial Services' hearings on virtual currencies.

The twins are also keynote speakers at Money2020 later this year, which is expected to attract thousands of financial industry attendees.

The SEC has recently issued guidance that warned investors bitcoin:

Nevertheless, the Winklevoss Bitcoin Trust continues to make filings with the US government's regulatory body for securities, suggesting its listing on NASDAQ could very well occur at some point in the future.

Winklevoss image via Huffington Post