Does Your Index Fund Own SpaceX? Here’s Why You Shouldn’t Care.

One Rocket, Two Indexes

SpaceX finally listed last week, and within days it did what hot IPOs do: it fell 16 percent on Monday, its third straight down session. Almost immediately the questions started landing in my inbox — does my fund own it, and should I switch to one that does, or one that doesn’t? Telis Demos laid out the actual mechanics in the Journal, and they’re worth knowing. The Vanguard Total Stock Market ETF (VTI) now includes SpaceX, because it tries to hold the whole U.S. market. S&P 500 funds — your VOO (VOO), your SPY (SPY) — do not, because the S&P committee waits longer and screens for profitability before it lets a new name in. So depending on which broad index you happen to own, you either have a sliver of SpaceX or you don’t.

The Gap Barely Exists

Here is the part nobody wants to hear after they’ve spent a weekend agonizing over it: the difference between those two indexes is tiny. Over the past decade the S&P 500 ETF returned 15.6 percent annualized; the total-market fund returned 15.1 percent. That is a half-percent gap, and it has nothing to do with this one rocket — it’s just the long-run noise between two enormous, overlapping baskets of the same big American companies.

And SpaceX itself can’t move the needle the way the headlines imply. Less than 5 percent of the company was actually sold, and that float is unlikely to top 50 percent within a year. A stock with a sliver of its shares trading gets a sliver of weight in any index that holds it. You can own “the fund with SpaceX” and barely own SpaceX at all. The shiny thing you’re chasing is a rounding error in the position that’s causing you to lose sleep.

The Decisions That Actually Pay

This is the column I’d frame and hang on the wall. People will spend hours deciding which index holds the new IPO — a choice worth maybe half a percent a year — and then completely ignore the three levers that move the outcome by far more: how much you save, how your money is split between stocks and bonds, and what you pay in fees. Those are worth ten times the benchmark question, and they’re the ones nobody fights about on the internet, because the answers are boring. Own the broad market cheaply, hold it, and stop relitigating the benchmark every time something blasts off.

Demos quietly flags the trap at the bottom of all this: a self-styled “passive” investor who keeps switching indexes to dodge one stock has reinvented stock-picking — with extra steps and worse results. If you’re trading funds to control whether you own SpaceX, you are an active manager now. You’ve just given yourself the costs and the second-guessing without the upside.