La propuesta es una traducción literal, no encontré referencias en español. La sugerencia es en plural para distinguirlo de esta acepción: When a broker votes on your behalf without your instruction, it is sometimes referred to as “the broker vote” or “the 10-day rule.”
https://www.shareholdereducation.com/your_intermediary.asp

Me basé en la siguiente definición:
Currently, to calculate their commission budgets, buy-side firms typically conduct what's known as a "broker vote," an internal process in which all of a firm's portfolio managers, analysts and traders qualitatively assess the value of the various services provided by different brokers and decide which firms' services they want to buy. Asset managers may develop their own voting system based on internally developed qualitative factors, using points or a ratings system.

For example, Darren Bodenhamer, head trader at JMP Asset Management, a San Francisco-based hedge fund, relates, "We have a quarterly voting process in which we quantify the value of research and execution from each broker. We're all involved in the process."

Obviamente así debe ser por el CONTEXTO. Votan los clientes, no los corredores.