Swiss higher education institutions support open access. The Swiss National Science Foundation requires grantees to make their work open access as of 2020, either in the gold or the green road, possibly after an embargo period of 6 or 12 months. It also offers grants to cover APCs (Article-Processing Charges), to publish in gold OA journals. But it does not cover the costs of publication in "hybrid journals" (subscription journals with an OA option). The SNSF supports plan S, but "it is not in a position to add its signature to the plan at present."
According to the Swiss National Strategy on Open Access, adopted in 2017, all publicly funded research in Switzerland should be open-access in 2024.