Also known as: How does moomoo handle dividends from the stocks in my account?
Buy before ex-dividend date: you are entitled to the dividend. If you buy on ex-dividend date, you do not get the dividend.
Sell on/after ex-dividend date: you are entitled to the dividend.
Dividends less withholding tax (if applicable; US withholding tax is 30% https://www.moomoo.com/community/feed/109012797882374?lang_code=2&data_ticket=441896acf760b247a0cf9e113dce06b6&content_type=feeddetail&channel_name=15) will be ...