Market-on-Close (MOC) imbalances showed notable fluctuations over April 16 and 17, 2025. On April 16, the S&P 500 had a positive MOC imbalance ranging between $576 million and $610 million, while the Nasdaq 100 exhibited a larger positive imbalance of approximately $1.7 billion. The Dow 30 showed a slight negative imbalance of around $82 million to $94 million. The Mag 7 stocks, a group of major technology companies, recorded a positive imbalance near $918 million. By the following day, April 17, the MOC imbalances shifted dramatically to the downside, with the S&P 500 showing a negative imbalance of about $2.2 billion, the Nasdaq 100 at approximately $332 million negative, and the Dow 30 at nearly $963 million negative. The Mag 7 stocks also moved to a negative imbalance of roughly $235 million. Additionally, there were substantial call option sell orders on key technology stocks including Apple, AMD, and Amazon, indicating that a large investor was selling options to collect premiums. The overall MOC activity suggested a $2 billion sell imbalance, particularly highlighted by Apple’s selling pressure at the close.