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bryanlarsen 12 hours ago

The flaw is the limited float. Indexes will be forced to buy a huge number of shares which don't exist, driving up the price.

For general investors if this is going to eventually happen, the earlier the indexes buy in the better. Otherwise more sophisticated investors will buy ahead of the indexes and grab the profit.

lokar 10 hours ago | parent [-]

if they weighted (fully) by float (perhaps the average float from the trailing 90 days to the re-balance) it would not be as easy to game. The Nasdaq is accounting for float, but not completely.

dmoy 10 hours ago | parent [-]

Aren't basically all the huge serious index funds float weighted?

nighthawk454 9 hours ago | parent | next [-]

They are, but SpaceX is trying to get rules changed. They want the index to buy at a multiple of the float, so they release say 5% but get bought as if they had released 15% float. They also normally wouldn't be eligible for index inclusion for ~1 year, after showing multiple quarters of good stewardship, etc. They're trying to bypass all that

t0mas88 an hour ago | parent | prev | next [-]

Yes, the MSCI World and FTSE World that many broad ETFs and funds track are float weighted.

lokar 10 hours ago | parent | prev [-]

Matt Levine wrote (uh, yesterday?) that the Nasdaq 100 was adding it (not a full linear weighting....) right now to accommodate this scam.

dmoy 9 hours ago | parent | next [-]

Ok fair, I forgot that QQQ is as big as it is.

Edit: wait, but QQQ is float adjusted?

What are the biggest not-float-adjusted index funds?

lokar 9 hours ago | parent [-]

I don't know about the funds, but it's really about the index. Both for the index funds that use the index, and the active mutual funds and index funds benchmark to that index.

dmoy 9 hours ago | parent [-]

Why is it really about the index though, if the index fund doesn't track that public index?

If the index fund is tracking some proxy that is float weighted, isn't that what matters? At least when it comes to people's money.

lokar 8 hours ago | parent [-]

Index funds track an index, thus the name

5 hours ago | parent [-]
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dbt00 9 hours ago | parent | prev [-]

Yeah, the OEX is a more serious index for more serious people.