Looks like GSB may go ex-dividend on the pay date of 12/5. Or the following day. Because the dividend is so large, it might be 25% of the stock price. Where a special dividend rule kicks in (see below). GSB stock is currently trading very close to that 25% threshold though so not sure.
Found this on a site about dividends:
If the dividend is 25% or more of the stock value, special rules apply to the determination of the ex-dividend date. In these cases, the ex-dividend date will be deferred until one business day after the dividend is paid.
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