Why Is Prothena (PRTA) Down 1.5% Since Last Earnings Report?

A month has gone by since the last earnings report for Prothena (PRTA) . Shares have lost about 1.5% in that time frame, underperforming the S&P 500. Will the recent negative trend continue leading up to its next earnings release, or is Prothena due for a breakout? Before we dive into how investors and analysts have reacted as of late, let's take a quick look at the most recent earnings report in order to get a better handle on the important drivers. Prothena Q1 Earnings Miss Estimates on Higher R&D Expense ...