I own a hedge fund. I believe my algorithm will crush the market and return me a 20% annual yield. However... maybe it'll give me a -50% yield one year. I need

I own a hedge fund. I believe my algorithm will crush the market and return me a 20% annual yield. However... maybe it'll give me a -50% yield one year. I need a suite of zero-risk investments. A negative interest rate sounds insane, but I can't easily hold on to a billion in cash, I'm not a bank! Where am I going to put it, I can't trust Wells Fargo, my mattress is too small, Buster burned down the banana stand! Sometimes breaking even-ish is best for hedging risk.