The bank said the financing was dependent on the strength of a party on cantonal and federal levels but did not entail a specific political commitment.
Credit Suisse, which published the announcement in a report on corporate responsibility, said it considered the funding as part of its support for the role of political parties in the Swiss militia system.
The other main bank, UBS, said it was examining its funding policy but has given no further details.
The Raiffeisen bank recently announced it was paying a maximum of SFr246,000 annually.
Switzerland has come under increasing pressure from the Council of Europe for its opaque policy on party funding. Switzerland is one of the few countries without any laws on the issue.
It is believed that more than a third of the top 20 Swiss companies make direct financial contributions to parties.
The justice ministry is due to report on the issue by next month.
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Right and centre attract most campaign funds
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In an interview with Le Temps newspaper, Peter Eicher, in Switzerland since Monday, said international standards demanded transparency. “Swiss citizens would no doubt be interested in knowing where this money comes from. After transparency comes the question of regulating campaign financing. How much can a party spend? How much can a party receive?” Eicher said these…
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That’s the finding of a report commissioned by the justice ministry as part of its response to repeated criticism by international watchdogs about the opaque political funding system in Switzerland. Based on figures by a leading market research institute, political scientist Michael Hermann of Zurich University examined the spending on advertising ahead of 39 nationwide…
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Sweets, pens, hats and toys – all the parties are offering voters some kind of free gift. (Pictures: Martin Rütschi, Keystone)
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If you want to start a conversation about a topic raised in this article or want to report factual errors, email us at english@swissinfo.ch.