While the S&P 500 may be ending 2016 with double-digits gains, almost a third of the index' individual stocks have gone down. Here are some of the perpetrators you should dump from your portfolio. Abbott Labs  (ABT) shares have lost about 15% of their market value, which means that they're under-performing the S&P 500 by about 25%. Shake Shack (SHAK)  rose 10% on good third-quarter results but the stock has been forming a bearish reversal pattern. Enstar Group's (ESGR) chart is starting to look "toppy" and you should sell it as soon as it hits $190. Alexion Pharmaceuticals (ALXN) has been shedding more than 35% of its market value since January and could go down even more. Bank of New York Mellon (BNY) has rallied 15% since the beginning of the year. The sell signal trigger will happen when it hits $47 a share.

This article was written by a staff member of TheStreet.

More from Video

If You Want to Invest in Artificial Intelligence, Here's the One Stock to Buy

If You Want to Invest in Artificial Intelligence, Here's the One Stock to Buy

Economist Perspective: Brexit Endgame in Sight?

Economist Perspective: Brexit Endgame in Sight?

Smaller Cap Stocks Could Make Great Stocking Stuffers Ahead of 2019

Smaller Cap Stocks Could Make Great Stocking Stuffers Ahead of 2019

5 Highly Anticipated Tech IPOs to Watch in 2019

5 Highly Anticipated Tech IPOs to Watch in 2019

Trading Strategies: How to Play the Federal Reserve's Decision Next Week

Trading Strategies: How to Play the Federal Reserve's Decision Next Week