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Stocks set to mark a bullish milestone for the first time in five years, as ‘momentum’ rules the week

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Billions flow into equities – a bearish signal?

What a week for the markets.

As of Friday afternoon, the , the Dow Jones industrial average and the Nasdaq composite have all notched gains for five days straight, from Monday through Friday. The last day that the three major indexes have logged such a streak was in 2011, in the week of Sept. 12 — coincidentally, also from a Monday to a Friday.

Before that, the three indexes rose each day of a full week just a few months earlier, from June 27 to July 1.

This time around, the coincident one-week runups to record highs come as part of a big post-election rally.

"Momentum wins," summed up Michael Block, chief strategist at Rhino Trading Partners, in a Friday email to CNBC. "It's broadening out, and it's the most powerful thing going on right now."

On the other hand, MKM Partners technical analyst Jonathan Krinsky cautions against making investment decisions based on a small cluster of data points.

"One sample size is tough to glean too much from, and Sep. 2011 was a much different market," he wrote to CNBC. "So I don't think I would read too much into it."

The last time the three averages moved higher for six days straight was in the period ended July 13, 2010.