>>Royalty Pharma at one point was looking to go public but don't know if they decided wasn't worth the trouble and they probably don't need the cash now.
At one point there was some weird securities law technicality that made it hard for this type of company to go public - don't know if that is still the case.
Incidentally, Tom Neff (FGEN CEO) founded the predecessors of what eventually became Royalty Pharma.