Goldman
Always “Goldman”, a singular noun for a singular firm. Never “Goldmans”.
Look what happens if you are fast and loose with plurals in a storied trading firm.
It tickles me that this website is for the online Amish community, and was “founded in 1955 by Jay Lehman to serve the local Amish” - being a group of traditionalist Christian church fellowships known for simple living, plain dress, and reluctance to adopt many conveniences of modern technology.
Notwithstanding a fairly gaping flaw in the business model, Lehmans' hardware store made a much better fist of it than the unrelated investment bank did.