[Previously] Precidian Investments already received the greenlight from the SEC in May for its own active ETF model. BlackRock, American Century Investments and Index IQ are among the firms that licensed Precidian’s model.
".....The Fidelity Blue Chip Growth ETF, Fidelity Blue Chip Value ETF and Fidelity New Millennium ETF will begin trading Thursday. The three equity-focused funds will be actively managed and reveal their holdings once a quarter -- unlike traditional ETFs, which do so daily.....American Century launched the first hidden-asset ETFs in April, followed by Legg Mason last week. Goldman Sachs Asset Management, JPMorgan Chase & Co. and T. Rowe Price Group Inc. are among the asset managers who have also filed plans....."
FBCG, FBCV, FMIL https://www.fidelity.com/etfs/different-types-of-etfs
Reading the announcement from Fidelity, I was struck by two things.
1. They seem to want to charge a purchase fee of a few cents/$1000, which adds up if you buy and sell frequently.
2. I expect that the Fund's holdings can be reverse engineered from the tracking basket, though Fidelity clearly has no fears about this, or at least thinks that the increase in AUM and associated fees is enough to compensate for the increased transparency.