ADR stands for American Depository Receipt. Similarly, GDR stands for Global Depository Receipt.
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Honda went public on August 11, 1987 with the ADR (American
Depository Receipt) ticker symbol HMC.
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I believe that Zurich Financial owns Farmers. Their Symbol
trades in the US under an American Depository Receipt [ADR]:
ZFSVY
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you may trade the Vestas ADR (American Depository Receipt) on a
pink slip exchange. the symbol is VWDRY.PK
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It can stand for a lot of different things. Most likely American
Depository Receipt. Other contenders include Alternative Dispute
Resolution or a type of filming technology.