Quote from vertigo3:
P,
your observation about adj for roll, adj for premium, exactly why I started looking at spy for gap fills.
High print for SPY today on one of my data feeds, for spy 133.69, I think you have bad tick. (data I am referring to came from Trade Station feed).
SPY gapped up APril Fool's day (apr 1)
If you consider gap filled as having printed at or below the high of the previous day (Mar31 SPY HOD was 132.73), well then you might consider it closed, but I don't (although I will say that often, just a print at the high of the previous day can/will generate buying).
I like to see price touch high of the last 5-min bar, high of last 5min for Mar31 was 132.01 (within a couple of pennies)
Purist