None of them are individual projects, all of those companies have several projects in Haskell. Standard Chartered, for one, have their own custom implementation of Haskell and it is used by dozens of developers across different projects.
IIUC it's their own custom implementation of something a lot like Haskell, with the compiler implemented in Haskell.
It's called Mu. It's strict and has a few other quirks. There are a few different teams using it for different projects.