Here are four stocks shorts to watch in this precarious market.

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1. Athenahealth (ATHN) - Get Report

This stock has broken down sharply in the last two weeks, falling to Wednesday's low at $104. The maker of billing and medical practice-management software beat earnings estimates but missed on revenue when reporting last week. On the weekly chart, a massive topping pattern appears poised to be taken out. There is one more support level from the mid-2014 spike low at $97. Watch for a test of that on Thursday, followed by the next target, which is in the mid-$80s.

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2. Chipotle Mexican Grill (CMG) - Get Report

Chipotle shares had a big breakdown on Wednesday after the company missed earnings forecasts. The stock fell $37.65, or 9%, to $368.02 on 6.1 million shares traded. The move pulled the stock out of a consolidation range that it's been in for the last 90 days. Looking at the weekly chart, the stock broke a key lateral support zone and may very well test its next support level around $350. The middle of the channel points as low as $335.

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3. DexCom (DXCM) - Get Report

This stock appears to be rolling over. It's down $2.97 to $77.23 on 1.5 million shares traded on Wednesday. The move, which came on no news from the medical device company, broke the stock down from a month-long falling wedge pattern. It was down nearly $5 intraday, reaching the next lateral support level before bouncing. A takeout of Wednesday's low near $75.50 could lead to a test of the next support level, which is around $70.

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4. Texas Roadhouse (TXRH) - Get Report

Texas Roadhouse is in a bear flag within a sharp down-channel off its July high. The stock dropped just 13 cents to $38.86 on rising volume of 967,600 shares Wednesday after falling 73 cents on Tuesday. It's near the bottom of its rising flag, and looks poised to break down from here. The channel bottom and next lateral support for the restaurant company converge in the mid-$30s.

See Harry's video chart analysis on these and other stocks.

This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.