The body of the 49-year-old former chief financial officer at ABN Amro was found in woodland in Winkfield, Windsor, Berkshire, yesterday morning.
A Thames Valley Police spokesman said they could not confirm the identity of the dead man, but added: "He is believed to have died from gunshot wounds.
"At the moment it is being treated as an unexplained death. "A definite cause of death has not been established."
Mr Boumeester joined ABN Amro, the 2007 takeover of which plunged the Royal Bank of Scotland into record losses, in 1987.
He worked his way up to the post of chief financial officer before leaving early last year. It is not known whether he left the company voluntarily or was forced
Respected banker Huibert Boumeester committed suicide after losing his job - Greenwich Diva