It was a good week for Etsy (NASDAQ: ETSY) investors. Shares of the arts-and-crafts marketplace operator soared 18.2%, after the company conceded that it's considering strategic alternatives.The fireworks began after the market close on Monday when activist investors TPG Group and Dragoneer reported a combined 8% stake in Etsy. They announced that the intent in taking a sizable stake in the out-of-favor e-commerce platform is to engage in talks with Etsy regarding strategic options.