It depends how you trade, on my PnF systems I had buy signals at 3970, 3980 and 4000 yesterday afternoon, evening, none of them have unwound yet.
On a tick trading basis there were entry points at 3937 (break of range & min H&S), 3952 (break of overhead resistance), 3980 (break of continuation pennant, target 4030) - all of which may have been closed at the end of the day. I didn't take all the trades (more's the pity) but the tick positions I did have got closed at 17:25 at 4007/4008.
Today - soft start so buy on open (I got 4029), 4050 (breakout of ascending triangles - target for which was 4069 (If the target wasn't taken, then a break of 55 was the close point as the days trend was broken) - now looking for the next obvious entry point - which, to me at the moment, looks like a break out of the range through 62 to the upside or 47 to the downside, beware of US figures.