Joel Greenblatt started to build up the position in ProShares Trust - ProShares Short VIX Short-Term Futures ETF -1x Shares in Q3 2024 and continued to invest until Q2 2025. Since then they sold 10.3k shares. The investor sold all their shares in Q3 2025 and doesn't own any shares in ProShares Trust - ProShares Short VIX Short-Term Futures ETF -1x Shares anymore.