I came across this while checking on some sports news:
The team will be officially on the market next week, according to a league source. The Hawks have retained investment banking firm Goldman Sachs and Inner Circle Sports to handle the sale process. The firm will gather and vetting prospective buyers. (Atlanta Journal-Constitution)
Is it all right to use the word "firm" in here, since there are two companies followed, should it be "firms"？ I am not sure if both are ok. And in the last sentence, clearly it should be "vet",not "vetting", am I right?