Does Vanguard Know Something?

I recently received an email from Vanguard informing me they’re updating the prospectus on a developed world fund I hold with them. The change relates to concentration limits. Under existing European regulation, no single company can normally represent more than 10% of a fund. However, there is a pre-existing exemption available to index-tracking funds that allows this ceiling to be raised to 20%. Vanguard are now choosing to apply that exemption.

Here’s what caught my attention: no company has actually hit that 10% threshold yet. But if one did, Vanguard would be legally obligated to sell shares in that company to stay compliant, meaning the fund would no longer perfectly track the index it’s supposed to mirror.

So the question isn’t really about the rule change itself. The exemption has always been there. The more interesting question is why Vanguard are choosing to activate it now. Do they see a company, almost certainly Nvidia, approaching that limit in the future and want the flexibility to let it ride rather than be forced to trim a winning position?

The option to go to 20% has existed all along. The timing of this decision is what’s telling, are they showing conviction? Then again, maybe I’m just a retired guy with too much time on his hands, thinking too hard about things.