SEA Rule 17a-4(b)(4): > Every member, broker and dealer [...] shall preserve for a period of not less than three years, [...] Originals of all communications

SEA Rule 17a-4(b)(4): > Every member, broker and dealer [...] shall preserve for a period of not less than three years, [...] Originals of all communications received and copies of all communications sent [...] (including inter-office memoranda and communications) [...] https://www.law.cornell.edu/cfr/text/17/240.17a-4 https://www.law.cornell.edu/cfr/text/17/240.17a-4