SPY: Large Volume Trades and Price Impact


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S&P 500 is showing signs of institutional buying: Buy Imbalance sits at +$744.4 million

Following the Big Money in S&P 500 Stocks

So far in trading today, the S&P 500 ETF is unchanged. SPY stock last traded at $548.54. Large volume bursts in S&P 500 stocks reached 46.9 million shares worth a total of $7.0 billion in transactions. There was notable buy pressure in the Technology and Financial sectors. Overall, buy volume pressure outpaced sell volume pressure by a 1.2 to 1 ratio. There were 112 stocks that had more buy pressure on balance, and 119 stocks that had more sell pressure from large institutions. As a whole, there was a net positive +$744.4 million in dollar volume trades. A greater amount of the trading volume occurred on lit exchanges, at 65.0%, compared with 35.0% 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 of +$744.4 million occurred at 2:00 PM. This also represented the peak buy imbalance for the day. The lowest cumulative sell imbalance occurred at 11:15 AM, when the net sell reached -$38.2 million. The largest spike in imbalance came between 11:30 AM and 11:45 AM when the buy pressure outweighed the sell pressure by a 4.6 to 1 ratio.

Flow by Sector

Technology had the highest amount of dollar volume bursts of all the SPDR sectors, with buy dollar volume exceeding sell dollar volume by $1.0 billion. 24 of the Technology stocks had positive dollar balance, versus 16 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 7.0 million shares. As of this afternoon, the average purchase price on buy volume was $133.95. The stock has rallied $5.05, indicating strength following the trade.