SRL for [informed]: But a much smaller mutual fund company , the USAA Investment Management Co. unit of USAA , San Antonio , Texas , said it [informed] nine national brokerage firms that it will cease business with them unless they stop index - arbitrage trading .
ARG-0: it | ARG-1: nine national brokerage firms | ARG-2: that it will cease business with them unless they stop index - arbitrage trading