Which preposition to use with stockbrokers

at Occurrences 1%

I have been taken for a merchant upon the Exchange for above these ten years, and sometimes pass for a Jew in the assembly of stockbrokers at Jonathan's.

in Occurrences 1%

"Mr. John Paley is a stockbroker in this city," he replied.

of Occurrences 1%

Parisian newspapers, in their "society columns" referred, in veiled language, to the passion of an aged king, a democratic monarch, who had left his throne, much as a manufacturer of London or a stockbroker of Paris would leave his office, for a vacation on the Blue Coast.

on Occurrences 1%

He consulted no stockbroker on this weighty point; he did not even buy a shilling book of advice such as we have seen advertised for those who do not know what to do with their money.

to Occurrences 1%

Twopenny was stockbroker to the Bank of England, and died in 1809.

with Occurrences 1%

Banks, financial firms, insurance companies, trust companies and stockbrokers with big investment connections will take as much underwriting as they are offered, in many cases without making very searching inquiry into the terms of the security offered.

Which preposition to use with  stockbrokers