Thanks for the info. I began buying each of the ARK ETFs last June August. I'd seen ARKX mentioned on YouTube, but didn't know the rollout date. It will be good to get in ASAP.
Btw, I wonder why ARK doesn't have an alternative energy ETF? I have TAN & PBW which have performed even better than any of the ARK funds since buying them. I don't know how "actively" Invesco trades the stocks that are in them. ARK seems to trade quite often, by what I've seen on their daily trade reports, but I have no idea if that's common among managed ETFs.
(edit: actually picked up the first lot of ARKW in June, then all the others in July)