Market headlines, globally, have been dominated by the storied performance of a select few transformational, winner-take-all business models.These securities are now household names, even for the kids. At the end of the last decade, this wonder-basket (including companies like Apple, Google, and Microsoft) already commanded a whopping market cap of over $700 billion. Today, with less than four weeks to go in this decade, these “FAMANGs” - which also include Facebook, Amazon, and Netflix - are worth nearly $5 trillion.

The impact of the FAMANGs on S&P returns has been tremendous. At the beginning of the decade, these six names had an aggregate S&P 500 weighting representing just over 6% in the index. Today, it is nearly 17%.
So the big question is this: how well would the S&P 500 index have done without the FAMANGs? In other words, if the FAMANG’s never existed, but instead the capital allocated to these six securities was allocated to the other 494 index securities by their market weights, how would the S&P 500 index have fared this decade? [1]
And here is your answer: We estimate that the FAMANGs – through November 29, 2019 – have contributed about 30% to the ten-year returns of the SPX. In other words, these six names alone represented about 12% of the total returns of a 500 stock index over this decade-to-date.
Those are big numbers, but – and going out on a limb here - we’ll bet at least a few out there thought the impact might have been even higher.

FOOTNOTES
[1] And this is without considering that the (negative) impact that the FAMANGs may have had on any of the other 494 business models in the S&P 500. Surely, without the FAMANGs, some of them might have done much better.
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