Market-on-close (MOC) imbalance data for July 29 showing net selling pressure across major US equity indices at the close, with the NASDAQ 100 registering a $1.3885 billion net sell imbalance, the S&P 500 at $849.7 million, the Dow 30 at $190.5 million, and the MAG 7 group at $233.4 million.
MOC imbalances capture the net directional pressure of orders executed at the closing auction, an important liquidity event for index-replicating funds. The reported sell-side imbalances for the NASDAQ 100 and S&P 500, alongside separate data for the MAG 7 cohort, indicate that closing-auction demand was outweighed by supply across both the broad benchmark and the mega-cap technology names, a dynamic relevant to instruments tracking US large-cap and tech-heavy indices such as UST1000.