Can’t easily find it, but you can try to dig into docs for this fund, for example:
If you are serious and you have 1 million to invest, you can also contact “Vanguard Investments Switzerland GmbH”.
Maybe. But except for the country it belongs to 
Wouldn’t be wise to assume that US brokers are safest to use these days
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In the past, after reading all the standard US blogs, I tried looking to see if it’s possible to directly invest with Vanguard, but I came to the conclusion that it’s not possible because on this website it only mentions ETFs, or mutual funds via a third party bank https://www.ch.vanguard/en/private-investor/how-to-buy
I looked on the “Professional Investor” version of the website (as opposed to the “private investor” one above) but it seems this is for institutions. I was surprised to see that a lot of the admin seems to be running on fax/post 
https://www.ch.vanguard/en/professional/product/investing-with-vanguard/mutual-funds
If I’m missing something I would be glad to be corrected.
In Switzerland , I think only option is via Exchanges
However for UK folks, there seems to be a way to invest directly
Consorsbank offers and individual segregated custody (Clearstream Frankfurt) with a setup cost: €30,000 + VAT (one-time) and annual maintenance cost: €32,000 + VAT.
This is not a suggestion, but a data point on costs of such setups.
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Not in my understanding, but Undisclosed made a reasonable argument that I might be wrong about ZKB. I would be interested if someone were to ask ZKB directly, and share the response here - as I did for PF and IBKR.