The ProShares UltraPro Short QQQ ETF (SQQQ) closed up 2.43% at $30.31 on December 9, as the Nasdaq 100 Index fell 0.84% to 21,440.82 amid a challenging environment for tech stocks. The decline in the Nasdaq 100 was influenced by geopolitical tensions, particularly China's investigation into Nvidia for potential anti-monopoly violations, which led to a 2.6% drop in Nvidia shares. This investigation has heightened uncertainty in the tech sector, already grappling with slowing profits and competitive pressures. Additionally, Advanced Micro Devices saw a 5.6% decline after a downgrade from Bank of America, citing increased competitive risks in AI. The broader market also faced headwinds, with the S&P 500 and Nasdaq Composite retreating from record highs as investors anticipate key inflation data later this week.