Now I know what happened to my portfolio in 2015

Here is an interesting factoid from Eric Delamarter's Half Moon Capital 4th quarter report:

"We found it noteworthy how narrow the breadth of the S&P 500’s 1.4% performance was in 2015. Remarkably, five mega-capitalization technology companies drove the whole market—accounting for over 300% of the indexes return. In other words, if it were not for that handful of stocks, the market would have been down approximately 3%. Further, stocks within the S&P 500 with market capitalizations less than $10B were down an average 12.6%."

This divergence of price movement among large categories is remarkable.

(You might take a look at friend Eric's fund: http://halfmooncapital.com/ His performance is solid and he is a meticulous value investor.)