Onyx Pharmaceuticals ( ONXX) is a biopharmaceutical company engaged in developing therapies that target the molecular mechanisms that cause cancer. Yesterday's Volume: 4,073,900 Average Volume: 1,278,280 Volume % Change: 211% This stock added yesterday to its large gains from Monday of 14% as shares continue to attract buyers off optimism the company may be sold. A Bloomberg article mentioned that two people with knowledge of the matter said that the company is exploring options including a possible sale. From a technical standpoint , this stock is running into some big overhead resistance at $45.90 to $46.07, where the sellers are overwhelming the buyers. Despite the strong moves in this stock the last two trading sessions, I would not get interested from the long side until it can manage to take those resistance levels out with volume. This feels more like a case of sell-the-rumor than buy-the-rumor since the stock ran right into resistance. I would only change my mind if ONXX can manage to sustain a high-volume move and close above $46.07 in the near future.