"Banks must file a one-time Designation of Exempt Person report (DOEP) to exempt each eligible listed public company or eligible subsidiary from currency transaction reporting. The report must be filed electronically through the BSA E-Filing System within 30 days after the first transaction in currency that the bank wishes to exempt."
If the first transaction is June 1, 2019, file your DOEP by June 30, 2019 and you're good to go.
You also must perform an annual review on the exempt customer to verify that they are still publicly traded. (If they are delisted you would have to revoke the exemption.)
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