To elaborate a little further, stocks that split (if they're strong) will tend to move back up quickly toward their pre split price, as more investors see the post split price as more of a bargain. See EXPE as a perfect example, which pre split had trouble getting above the 85 level, but after the split had no problem cracking 50 (i.e. 100 pre split). Also, when a split is announced, strong stocks tend to run up into the split. This can make it scarier for shorts. If in fact EBAY announced a split, I would find it much less attractive as a short because of this psychological phenomenon.