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What is an effective way to convert large sums of US based investments to foreign currencies?
A stock, bond or ETF is basically a commodity. Where you bought it does not really matter, and it has a value in USD only inasmuch as there is a current market price quoted at an American exchange. But nothing prevents you from turning around and selling it on a European exchange where it is also listed for an equivalent amount of EUR (arbitrage activities of investment banks ensure that the price will be equivalent in regard to the current exchange rate). In fact, this can be used as a cheap form of currency conversion. For blue chips at least this is trivial; exotic securities might not be listed in Europe. All you need is a broker who allows you to trade on European exchanges and hold an account denominated in EUR. If necessary, transfer your securities to a broker who does, which should not cost more than a nominal fee. Mutual funds are a different beast though; it might be possible to sell shares on an exchange anyway, or sell them back to the issuer for EUR. It depends. In any case, however, transferring 7 figure sums internationally can trigger all kinds of tax events and money laundering investigations. You really need to hire a financial advisor who has international investment experience for this kind of thing, not ask a web forum!