You are correct. Brokers may not know cost basis. In fact, you should expect them not to report basis and be prepared to determine basis from your personal records.
The IRS Instructions for Form 1099-DA report that brokers are not required to report basis information with respect to sales in 2025. It states:
2025 transactions
These instructions provide information for brokers to use to complete Form 1099-DA for each sale a broker has effected in 2025. Brokers are not required to report basis information with respect to sales effected in 2025.
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