It is my understanding if you want to be a share holder of record for having shares of EIGH on September 30th you will need to purchase the shares by September 27th or earlier in order to allow for the 3 day settlement period. I was in a stock last year where everyone on the board who did not buy their stock 3 days prior to the date of record did not qualify for the dividend because the brokers said their accounts hadn't settled.
You are correct. The key point in time here is EOD Monday 9/27. You need to have purchased by then to get the dividend (or covered a short by then to avoid getting a due bill requiring you to pay the dividend on the shares you are short).
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