Mario Gabelli's position in ProShares Trust - ProShares UltraShort S&P500 -2x Shares is currently worth $777 Thousand. That's 0.01% of their equity portfolio (595th largest holding). The first ProShares Trust - ProShares UltraShort S&P500 -2x Shares trade was made in Q3 2017. Since then Mario Gabelli bought shares nine more times and sold shares on nine occasions. The investor's estimated purchase price is $1.64 Million, resulting in a loss of 53%.