- William Gallagher Associates Insurance Brokers Acquisitions
- William Gana
- William Gao
- William Garman
- William Gartland
- William Gelnaw
- William Genco
- William Gerstner
- William Glascott
- William Glass
- William Glastris
- William Goldberg
- William Golden
- William Gonzalez
- William Goodling
- William Gorman
- William Gotlieb
- William Gray
- William Green
- William Grindell
- William Gross
- William Gump
- William Guo
- William Gwyn
- William H. Connolly Acquired By The Hilb Group
- William Haddad
- William Hadler
- William Haemmerle
- William Haft
- William Haley
- William Hanenberg
- William Hanlon
- William Hannah
- William Hannon
- William Hariri
- William Harper
- William Harris Investors Mergers and Acquisitions
- William Harriss
- William Hartnett
- William Hasten
