SIPC 裏麵說的each capacity，是指一家公司嗎? 比如fidelity，vanguard 各是一個

Capacity In this description：

SIPC protection of customers with multiple accounts is determined by "separate capacity." Each separate capacity is protected up to $500,000 for securities and cash (including a $250,000 limit for cash only). Accounts held in the same capacity are combined for purposes of the SIPC protection limits.