Fixed annuities
A fixed annuity credits interest at a rate the insurer declares, locked for an initial period and then reset at the insurer's discretion above a floor written in the contract. The balance cannot go down from market movement; the trade is that the credited rate is what you get, whatever the markets do. Multi-year rate-lock contracts hold one declared rate for the whole term, which makes them behave like a bank certificate issued by an insurer, with tax deferral and without federal deposit insurance.