NEW YORK ( TheStreet) -- Building a portfolio in this bull market is kind of like coaching LeBron James, All you have to do is stand up every five minutes and yell "Give LeBron the ball." Pretty soon everyone will think you are a great basketball coach.Maybe it's not quite that easy in coaching or investing. But this market continues to hit new highs and continues to break out. It is easy if you are in the right asset classes, the right sectors and the right stocks.
During my 20 years in the market, I've seen a lot of streaks. Up and down, and what goes up can go down a whole lot faster than it went up. Biotech, health care and homebuilding, for example, have been on a tear. These are obviously very much risk-on sectors. Here is my current ranking of the market sectors: Data from Best Stocks Now App I have been giving the ball to these leading sectors for several quarters now. Right now, I continue to have my foot on the accelerator. I continue to be on offense, as I have been for the last four years. But I also have my eyeballs in the rear-view mirror, especially the warning: "Objects in this mirror may be closer than you think." I'm not trying to scare anyone. Nor am I saying there's a bear market around the next corner. I'm just saying that it is an absolute surety that this bull market will go bearish on us. That punchbowl has just about been drained and we have to be prepared. Recognizing the signs of the end of the bull market is far more important than knowing what caused it. There might be a million reasons. After the fact, a million pundits will tell us.