Correction, Rule 6620 has been superseded by rule 6222, so the trades could have been 10 seconds before the close. However those 4 trades were posted 19 minutes after the close. Maybe transmitted to the OTC Reporting Facility and posted are two different things.
(B) Last sale reports of transactions in OTC Equity Securities executed between 4:00 p.m. and 8:00 p.m. Eastern Time shall be reported as soon as practicable but no later than 10 seconds after execution and be designated with the unique trade report modifier, as specified by FINRA, to denote their execution outside normal market hours.
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