The FINRA and GNBT position seems to be that the N
Post# of 36537
(1) In respect to cash dividends or distributions, or stock dividends, and the issuance or distribution of warrants, which are less than 25% of the value of the subject security, if the definitive information is received sufficiently in advance of the record date, the date designated as the "ex-dividend date" shall be the first business day preceding the record date if the record date falls on a business day, or the second business day preceding the record date if the record date falls on a day designated by the Committee as a non-delivery date.
(2) In respect to cash dividends or distributions, stock dividends and/or splits, and the distribution of warrants, which are 25% or greater of the value of the subject security, the ex-dividend date shall be the first business day following the payable date.
https://www.finra.org/rules-guidance/rulebook...ules/11140