Portman Estate was created in 1764.
Jo Portman was created in 2005.
Portman Group was created in 1989.
Portman Building Society was created in 1846.
Mander Portman Woodward was created in 1973.
Knight Estate was created in 1830.
Lansbury Estate was created in 1982.
Burkle Estate was created in 1997.
Crown Estate was created in 1961.
Weeks Estate was created in 1912.
Man's Estate was created in 1972.
Ashbridge Estate was created in 1793.
Gloninger Estate was created in 1785.