| To explain the mechanism simply. Suppose you had a index of 100 companys each with a market cap of 1 G$ for a total of 100 G$.
You have passive investors owning 20 G$ of that index, amounting to 20% of the total, 20% of each company, and 200 M$ per company. You then rotate out a company for a new one also worth 1 G$. The index is still 100 G$, but to match the index you are contractually required to sell your 20% ownership of the old company and are contractually required to buy 20% ownership of the new company. However, the newly added company only released 5% of its shares to the public and the founder kept hold of the remaining 95%. Those fund managers are contractually obligated to buy 20% of the newly added company, but only 5% is available. Like a short squeeze, where the squeezer buys and holds supply so there are not enough purchasable shares to cover the shorts (obligated ownership), this is a financial divide by zero. To get the remaining 15%, which they are contractually obligated to acquire, they must purchase from the founder. As they are in violation of their contract if they fail to acquire the remaining 15%, the founder now has complete control to dictate any price they want. That is the scheme described: how to short squeeze retirement funds who do not even have shorts for fun and profit. Note that this is a minor variation on my post on the same underlying topic here: https://news.ycombinator.com/item?id=47392325 |
First: 5x5 is 25, not 20. So it's 25% rather than 20%
Second: they only have to buy the 25% of the listed shares.
To take your 1 Trillion example: if SpaceX has a total market cap of 1T, but only 500b get listed on NASDAQ, and the free float is 5%, the index will weigh SpaceX at 25% of the listed shares, which means it will be weighted at 500 * 0.25 = 125b.
And also note that index ETFs have tracking errors all the time (that's why arbitrage traders still have business!), and the ETFs themselves could also track the performance of SpaceX via derivatives instead of buying the stock. And I think, there are many investors of SpaceX who would like to sell some shares. Fund managers won't have an issue finding their phone numbers.