alt Hacker NewsTo a first approximation, yes, the index funds all need to buy the stock on the same day.
An unexpected surge of buying like this should lead to a big price hike. But everyone knows it's happening, so you'd expect every hedge fund and proprietary firm in the world to buy the day before the index funds buy, and sell into the price hike. So in fact the price hike will be a day earlier than expected. But wait, anyone smart enough to see that should buy the previous day...
In this way the "smoothing" of the trading at entry and exit gets passed on to intermediaries: other market participants who are expert at this.
This all costs the index funds, because every dollar of profit for the other firms is a dollar out of the pocket of the end investor. And huge index events like this are a particular bonanza for these traders. But it probably costs less than you think. Ultimately it's a highly competitive market: the slippage from this approaches the extent to which the prop traders have a higher cost of capital, plus a small risk premium. And remember that they don't have to find "extra" money to fund this trade. When they buy SpaceX they will sell 499 other stocks, doing the same trade there in reverse. Here's a study that approximates the effect at 0.86%[0]. By comparison, the banks underwriting the IPO typically take around 6% [1]. Though this will be smaller for a huge IPO like SpaceX, while the index arb trade will be bigger.
[0] https://www.eastspring.com/hk/insights/deep-dives/navigating...
[1] https://www.pwc.com/us/en/services/consulting/deals/library/...
Replies
>This all costs the index funds, because every dollar of profit for the other firms is a dollar out of the pocket of the end investor.
This is so wrong I'm not sure you understand common sense economics and by economics I don't mean anything you can find in a text book. If I invest nothing, the other investors or traders can still make a profit without costing me anything.
Opportunity costs are never real costs. If I have $10, and the traders do weird things with the prices and I don't spend the $10 on anything, I still have $10. The traders failed to cost me.
You're also ignoring the underlying issue which is that the valuation of SpaceX on the open market is different than the valuation it could get from forcing index funds to buy in early. If the stock is worthless then short sellers will make money, but short selling only works if the short sellers don't get squeezed. If the passive funds buy two weeks in, then early traders know that they can sell to a greater fool at inflated prices. Any short seller who is trying to discover the true price will stay back and short directly after the indexes have bought. That's the perfect moment for them. They want the post IPO hype and bull market, only for the stock to collapse within a year.
0.8% of drag is a lot when you can do basically the same thing by not strictly following the index.
There are funds from Dimensional and Avantis that are basically just index funds but with a bit more leeway to avoid these obvious pitfalls, and from what I saw they do perform approximately 0.5% better per year.