Art Cashing Sell On Rosh Hashanah – Business Insider Harvey Sax 13 years ago ART CASHIN September is historically the worst month for stocks. (So, far it doesn’t seem to be the case this year.) As many celebrate Rosh Hashanah today, Art Cashin offers a trade that would jibe with the September pattern: sell on Rosh via Art Cashing Sell On Rosh Hashanah – Business Insider.