If You Have a 401(k), How Much SpaceX Stock Will You Own?

A lot of Americans are about to own a sliver of SpaceX.The company completed its initial public offering Friday in the world’s largest stock market debut — and in a few days many personal and retirement investment accounts will have a stake in it, largely through index funds that track the broader market.Below, you can estimate how much of SpaceX and other companies you’d own if your investments were in various index funds:In the context of other index fund holdings, SpaceX will probably take up a smaller portion than one might expect, because most of its stock is not publicly tradable yet.Other major tech companies, like Nvidia and Apple, will continue to make up a much larger share of index funds compared with SpaceX, at least for now.And most typical retirement accounts already have a bigger investment in another Elon Musk venture.

According to our estimates, investors in total U.S.stock market index funds will own more than 10 times as much Tesla stock as they do SpaceX.Our calculator can’t predict the future, so it makes a few major assumptions.

It assumes that when index funds will buy into the company, its shares will be at $150, the opening price Friday....