securities firm(n = noun.group) brokerage, brokerage firm - a stock broker's business; charges a fee to act as intermediary between buyer and seller;
is a kind of nondepository financial institution
has particulars: bucket shop, marriage brokerage, marriage mart

accounting firm, brokerage firm, business firm, consulting firm, firm, firm omelet, firm up, hold firm, insurance firm, investment firm, law firm, national association of securities dealers automat, publishing firm, remain firm, removal firm, securities analyst, securities and exchange commission, securities industry, securities law, securities market, service firm, stand firm, take a firm stand