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Investing in dividends does not necessarily require going through a broker because transactions are rare. A traditional bank with the possibility of placing orders online is sufficient. In Switzerland, I prefer banks that are not at the forefront, especially internationally. They are often expensive and with the strong pressure from other countries that they are currently experiencing, it is not the best. Raiffeisen Bank, Migros Bank or the Cantonal Banks are worthy of interest. If you are really looking for a Swiss broker, I think of Swissquote.
Good scholarship.