It used to be that whole numbers held a particular strength for intraday traders for support or resistance, and to a lesser degree 25s and 50s.

This was more the case with NYSE, but also with NASDAQ to some degree.

But now, with RegNMS, multiple market centers, dark pools, and everything else that has developed over the last few years, it seems that this has changed.

Do you find that these numbers have any significance for intraday traders on a support/resistance basis anymore?

I do believe that when whole numbers .00 for example BREAK that range the stocks tend to get a QUICK up or down push depending on the direction the stock was heading when it broke the "X.00" price.

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i think the whole number thing is mainly a part of human psychology... they're just nice round numbers to either short or buy at... so yeh, imo that phenomenon still exists.

kinda like going to the gym, and when beginners start to plateau at nice round numbers like 100 lbs, or can't get past 150 lbs... etc.

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