As investors get ready for Halloween, five broadly held guru stocks that tumbled more than 10% during October are Meta Platforms Inc. ( META , Financial), Amazon.com Inc. ( AMZN , Financial), Alibaba Group Holding Ltd. ( BABA , Financial), Edwards Lifesciences Corp. ( EW , Financial) and SVB Financial Group ( SIVB , Financial) according to the All-in-One Screener, a Premium feature of GuruFocus.