English to Spanish Bus/Financial Finance (general)

Hi!

I am subtitling a video about the story of a British day trader. In this part it's talking about his beginnings at an "arcade". I've found that that's a specific term for firms were day traders operate, but could not find a translation or even an example of the word "arcade" used in this context in Spanish. I'm under the suspicion that this term might not be very used nowadays.

This is the sentence: "But this was a job at these kind of fledgling entities that were known as arcades at that point in time."

I would appreciate if someone could help me.

Thank you!