EXCLUSIVE OFFER: Jim Cramer's Protégé, Dave Peltier, only buys Stocks Under $10 that he thinks could potentially double. See what he's trading today with a 14-day FREE pass.4 companies that rallied significantly and are selling-off in the short term are a starting point for investors. 1. Keryx Biopharmaceuticals Inc. ( KERX): Rallied in late-January 2012 by over 40%, from positive results in its experimental kidney disease drug. Keryx reported that phosphate levels in blood were reduced in subjects, meeting its late-state trial goal. Since trading up to as high as $10, shares plunged after the company offered 8.2M shares at $8.49. The offering will raise as much as $80.4M. Keryx traded recently at around $6.70. Focuses on the acquisition, development, and commercialization of pharmaceutical products for the treatment of life-threatening diseases, including cancer and renal disease. Market cap at $529.06M. 2. Oncolytics Biotech Inc. ( ONCY): Traded above $4.50, but closed recently at $3.96. Preliminary results for Reolysin showed the treatment was safe and well-tolerated. The drug is used to treat metastatic colorectal cancer. The company priced its 8M share offering at $4, which was around 15% lower than a previous-day closing price. The funds will be used for clinical-trials and manufacturing-related activities. Focuses on the development of oncolytic viruses as potential cancer therapeutics. Market cap at $290.73M. 3. VIVUS Inc. ( VVUS): Shares peaked at $30 in late-July 2012 but closed at $12.58 recently. Vivus said that the European Medicines Agency recommended against approving Qsymia. Earlier in February, shares were trading higher because the company said Qsymia helped in weight loss.