BALTIMORE (Stockpickr) -- No doubt about it, volatility isn't going anywhere in September. Even though Thursday showed investors a measly 0.12% move higher, it was still a rollercoaster ride. After launching the S&P 500 as much as 1.3% early in yesterday's trading session, traders turned tail, shoving the big market index back down to near-breakeven on the day.

The recent spike in volatility means two things: It means that outperformers are going to move up quickly, and it means that the laggards are going to be absolutely toxic for your portfolio.

We're already seeing that manifest itself in the broad market right now. As I write, a whopping 42% of the stocks in the S&P 500 are down double-digits since the start of 2015. Some have even been halved -- or worse.

Put simply, not owning the "wrong" stocks is just as important as owning the right ones this fall. So to find out which stocks are showing downside risk ahead, we're turning to the charts for a technical look at five big "toxic stocks" you don't want to own…

Just to be clear, the companies I'm talking about today aren't exactly junk. By that, I mean they're not next up in line at bankruptcy court. But that's frankly irrelevant; from a technical analysis standpoint, sellers are shoving around these toxic stocks right now. For that reason, fundamental investors need to decide how long they're willing to take the pain if they want to hold onto these firms in the weeks and months ahead. And for investors looking to buy one of these positions, it makes sense to wait for more favorable technical conditions (and a lower share price) before piling in.

For the unfamiliar, technical analysis is a way for investors to quantify qualitative factors, such as investor psychology, based on a stock's price action and trends. Once the domain of cloistered trading teams on Wall Street, technicals can help top traders make consistently profitable trades and can aid fundamental investors in better entry and exit points.

So, without further ado, let's take a look at five toxic stocks you should be unloading.

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