The first ProShares Trust - ProShares UltraPro S&P 500 ETF 3x Shares trade was made in Q2 2017. Since then Bill Miller bought shares seven more times and sold shares on six occasions. The investor sold all their shares in Q1 2024 and doesn't own any shares in ProShares Trust - ProShares UltraPro S&P 500 ETF 3x Shares anymore.