ADRs are subject to additional fees that traditional stocks don't carry. These are periodic service fees or "pass-through fees" that compensate the depositary bank for providing custodial services. These charges generally run from $0.01 to $0.03 per share, but you'll be able to find the specifics in the ADR prospectus.
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Answer from https://ibkr.info/node/1185:
While the amount of this fee will generally range from $0.01 - $0.03 per share, the amounts may differ by ADR and it is recommended that you refer to your ADR prospectus for specific information. An on-line search for the prospectus may be conducted through the SEC's EDGAR Company Search tool.