[bluGill]

That is the point, and index funds pay many less managers. However they all have a few managers to handle the various paperwork needed and those managers do make some decisions. They have much less influence vs a traditional funds, but it is slightly above zero.

[daveshistory]

I think the point is that they don't have the influence to intentionally deviate from the index because they think they know better. If your mandate is to be passive, then you need an index to follow. If you are that sure the S&P 500 index is wrong for some reason, or whatever other index you follow, then you need to invent a new index. Then, you can follow the new index.

[bluGill]

At least my index funds do that. They don't get to constantly trade like non-index funds do, and they typically stick with the index, but every index fund I own has a line about "we select stocks that we think will match the index", which is different from buying the stocks from the index.

Again, the vast majority of the time they are matching the index stocks. However they have the right.

[daveshistory]

I guess that's true but put yourself in the position of a major fund manager. Would you rather explain "We lost 3% this year because of a dumb IPO because we track an index that includes dumb IPOs," or would you rather say, "We lost 3% this year because I decided, as a passive fund manager, that the index was wrong and I knew better"?

Your career would be over.

Or at least, you would have to transition over to an active fund!

[nradov]

No, that's not how it works. The resource managers who hire and promote fund managers are well aware of how trading large blocks too quickly can skew pricing. No one expects performance to exactly match the index. Read the prospectus.

[khafra]

I'm willing to buy the idea that most fund managers have the lattitude to give SpaceX the standard seasoning period, instead of buying in right when they hit the index. Which funds will do that? If it's all or most of them, that'd be nice.

[daveshistory]

I don't know what to tell you guys because I am not a fund manager. If any of you are, then I'll go with what you're saying. But I do know how large organizations work first hand, and I'm sure lots of us do on here.

Who exactly do you think wants to stick their neck out and say, "I work for a passive index fund. The whole premise of our career is that we don't try to play the market. But just this one time, I'm going to play the market anyway, and I'm going to use your money to do it."

Sorry, not happening. If you don't like the fact that this stuff is going to be included in the index, then your only option is to stop buying the index. Of course they think they would think they're right. Everyone doing active investing always, every time, thinks they're right. They will buy the index the way they always do, and then they will say, "If you don't like it, take it up with the index."

Watch the scene in Big Short at the bond rating agency for an indication of what's really going on here, is my guess.