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Re:Michael Dell Gets $12B Richer with Break from Public Eye by nabla9 on Saturday January 19, 2019 @01:22PM (#18948337)
$21 billion represents 0.1% of the SP500 market cap.

Sums that small don't significantly affect board decisions especially if they come from passive investors. For comparison, Vanguards SP500 fund (VOO) has market value $400B.

Had Dell gradually bought SP500 index over a year, the effect on price would have been minimal.

Re:Michael Dell Gets $12B Richer with Break from Public Eye by Cyph0n on Saturday January 19, 2019 @01:39PM (#18948432)
> Had Dell gradually bought SP500 index over a year, the effect on price would have been minimal.

But this is the whole point: you need to be careful when investing this kind of sum, because you may end up negatively impacting the market.

It's all about scale.

Re:Michael Dell Gets $12B Richer with Break from Public Eye by jjeaff on Saturday January 19, 2019 @01:48PM (#18948493)
VOO is only about $90B. But if you add up all the variations of vanguard sp500 index funds, it seems to be well over $500B.