NEW YORK ( TheStreet) -- These five stocks have had strong recent moves and show no sign of slowing. 

Achillion Pharmaceuticals (ACHN) - Get Report has rallied back after breaking down last week. A several-day flag was followed by a breakaway gap on Monday, a retest of resistance and then a pullback on lower volume on Tuesday, and then the follow-through yesterday. The stock spiked $2.37, or 19%, to $14.85, on 20 million shares, after reversing off $12. Now it's through the mid-channel line, and a follow-through could get it to $18, and then $20-$22.

At the time of publication, the author held no positions in any of the stocks mentioned.

This article is commentary by an independent contributor, separate from TheStreet's regular news coverage.

TheStreet Ratings team rates GROUPON INC as a Sell with a ratings score of D. TheStreet Ratings Team has this to say about their recommendation:

"We rate GROUPON INC (GRPN) a SELL. This is driven by several weaknesses, which we believe should have a greater impact than any strengths, and could make it more difficult for investors to achieve positive results compared to most of the stocks we cover. The company's weaknesses can be seen in multiple areas, such as its deteriorating net income, disappointing return on equity and feeble growth in its earnings per share."

You can view the full analysis from the report here: GRPN Ratings Report