Lostalot - GNSS - sorry, the stats I was using are only for upgrades and downgrades, and GNSS hasn't had any since last Friday.
Wait... Needham just downgraded them, buy-to-hold. I have 72 such moves by Needham, with an average first-day drop of 7%, and an average drop of 8% more by Day 20.
DYDD, YMMV, etc.