This paper analyzes the intraday interdependence of price movements and order flows for actively traded NYSE stocks and their CBOE-traded options. Stock net-buy volume (buyer-initiated volume minus seller-initiated volume)has strong predictive ability for subsequent stock and option returns, but...

We study the intraday behavior of bid-ask spreads for actively traded CBOE options and for their NYSE-traded underlying stocks. We confirm previous findings that stocks have a U-shaped spread pattern; however, the options display a very different intraday pattern--one that declines sharply after...