June 28 (Reuters) - Star stock picker Cathie Wood"s ARK Invest filed with the U.S. Securities and Exchange Commission on Monday to create a bitcoin exchange traded fund (ETF), the latest fund manager attempting to cash in on investors" growing interest in cryptocurrencies. Wood, whose ARK Innovation ETF was the top-performing U.S. equity fund last year, has been a vocal proponent of bitcoin. Her flagship ARK Innovation fund (ARKK.P) owns around $820 million worth of shares in cryptocurrency exchange Coinbase Global (COIN.O), making it the fund"s 10th largest holding. Coinbase has fallen 35% since its stock market debut in April. ARK"s application to the SEC follows recent filings by Fidelity and CBOE Global Markets in March. The SEC has yet to approve a bitcoin ETF. Bitcoin , tumbled in recent days to a two-week low as China"s expanding crackdown on bitcoin mining made investors more uncertain about the future of the leading cryptocurrency. Bitcoin on Monday traded at about $34,450, compared to its April peak of nearly $65,000.