The ProShares UltraPro Short QQQ ETF (SQQQ) closed up 4.08% on December 30th, reaching $30.34 as the NASDAQ-100 Index fell by 1.29% amid profit-taking and light trading volume. The decline in the NASDAQ-100 was influenced by concerns over the 10-year Treasury note yield, which has risen 50 basis points since early December, nearing the 2024 high of 4.73%. This yield increase has prompted investors to seek safer assets, contributing to the downward pressure on stocks. Additionally, the market is anticipating key economic data releases later in the week, including the December ISM Manufacturing PMI, which could provide further insights into the U.S. manufacturing sector's performance.