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There are plenty of foreign companies listed on American stock exchanges using “American Depository Receipts”: for example the 100 billion dollar German company SAP is listed as an ADR on the NYSE (although not NASDAQ, sorry) https://www.wsj.com/market-data/quotes/SAP

There is a list of 460 foreign companies cross listed on US stock exchanges, and that list includes a handful of german companies, although somewhere else said that there are 21 German companies listed using ADR, so perhaps the list is incomplete? https://stockmarketmba.com/listofadrs.php