The lockup agreement expired. Looks like employees and executives are selling up big time.
http://www.marketwatch.com/story/etsy-shares-fall-after-expi...
http://www.marketwatch.com/story/etsy-shares-fall-after-expi...
* -72% from 4/17/15 to 1/10/16
* -3% more if you extend through 1/11/16
* -2% more than that if you extend through end of week
https://www.google.com/finance?chdnp=1&chdd=1&chds=1&chdv=1&...
Side note: I wish there was a tool to track such dates and notify you as a (potential) public shareholder.