I suspect there is no imminent "big" news coming just based on the recent volume.  The last really big news, the announcement of the RGX/PPG agreement for TiO2 collaboration 0n 04/03 was preceded "coincidentally" by (3) consecutive heavy volume days (3/27 1 million shares traded, 3/28 1.139 million shares traded, 3/29 1.83 million shares traded).  Not to insinuate that anyone was trading ahead of the news....