Steven Altschuler, Director at Spark Therapeutics, Inc. (ONCE), bought 5,000 shares at $49.11 ($246K) on 2015-10-07, disclosed to the SEC on 2015-10-09.
Open-market purchase of $246k ONCE by Director. Below the thresholds we flag for high-conviction alerts (no C-suite role, rare reversal, cluster, or A-grade history).
Nothing distinguishes this filing.