The investment story of the year is undoubtedly how significantly the big five US tech companies have outperformed the rest of the market. But the trillion-dollar question is: do these businesses still offer value?

It has undoubtedly been a year of two completely different markets. The big five US tech stocks have delivered 35% year to date, compared with the 5% increase in the S&P 500 index. Amazon is up 63%, Apple 43%, Facebook 25%, Microsoft 27% and Google’s parent company, Alphabet, 10%. Together, these companies are now worth nearly $7-trillion and represent more than 20% of the value of the S&P 500 index. While they do not dominate the US index to the same extent as Naspers does the JSE, the market cap of these five stocks is about seven times the value of the entire JSE...

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