SPY: Large Volume Trades and Price Impact


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S&P 500 is showing signs of institutional buying: Buy Imbalance sits at +$1.3 billion

Following the Big Money in S&P 500 Stocks

So far in trading today, the S&P 500 ETF is down 0.7%. SPY stock last traded at $525.94. Large volume bursts in S&P 500 stocks reached 32.8 million shares worth a total of $10.3 billion in transactions. There was notable buy pressure in the Technology and Materials sectors. Overall, buy volume pressure surpassed sell volume pressure by a 1.3 to 1 ratio. There were 97 stocks that had more buy pressure on balance, and 131 stocks that had more sell pressure from large institutions. As a whole, there was a net positive +$1.3 billion in dollar volume trades. A greater amount of the trading volume occurred on lit exchanges, at 68.9%, compared with 31.1% being transacted in the dark pool. To learn more about large volume trades, check out our help section.

Daily Chart: Large Volume Bursts Over Time

As you can see from the chart below, the most recent cumulative buy imbalance is +$1.3 billion, however, the peak buy imbalance for the day occurred at 1:30 PM, when the net buy dollar volume was +$1.8 billion. The largest spike in imbalance came between 9:30 AM and 9:45 AM when the buy pressure outweighed the sell pressure by a 3.8 to 1 ratio.

Flow by Sector

Technology experienced the largest dollar volume bursts of all the SPDR sectors, with buy dollar volume exceeding sell dollar volume by $1.9 billion. 16 of the Technology stocks had positive dollar balance, versus 20 that were net negative.

Individual Stocks

NVDA stock had the single biggest volume burst activity of all the S&P 500 stocks. Buy volume bursts exceeded sell volume by 2.0 million shares. As of this afternoon, the average purchase price on buy volume was $1044.07. The stock has rallied $92.84, indicating strength following the trade.