Based on Tuesday's VIX close of 17.31, SPY's expected move for Wednesday, Oct 21 was ±1.09%, or ±8.39 points, a range of 760.66 to 777.44.
SPY closed at 773.09, up 0.53% (4.04 points), which used 48% of that expected move; the day's high of 774.43 and low of 768.40 also stayed inside the range.
That makes three sessions in a row inside the expected move (Oct 19, 20 and 21) and 6 of the 8 sessions since Oct 12 (75.0%).
The two closes outside the range were both declines: Oct 14 (−1.08%) and Oct 16 (−1.11%).
Data only. Not investment advice.