The UPC signatories are in alphabetical order:
- Czech Republic
- United Kingdom
While Poland has become increasingly critical about signing the agreement (see here and here) and Italy still opposes the Unitary Patent due to language issues, Spain still rejects the whole package.
To enter into force, the Unified Patent Court Agreement needs to be ratified by at least 13 of the 24 signing states, including Germany, the United Kingdom, and France as mandatory parties of the agreement.