Alibaba Group Holding is having a stellar year. A cheap way to play Alibaba (BABA) is through Altaba (AABA), the former Yahoo!, whose 15% stake in Alibaba is valued at $65 billion. Altaba shares are up 65% this year, to about $64, on Alibaba’s big gains, but trade at a 30% discount to the value of the company’s assets (see table).

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