I listed the 1st party Sony games in
this other thread. Out of them, the 2nd party ones (the ones published by Sony but developed by studios not owned by them) I did remember were are:
- Firewall Ultra (August 24, 2023)
- Stellar Blade (2023)
- Helldivers 2 (2023)
- Rise of the Ronin (2024)
- Death Stranding 2 (TBA, maybe 2024/2025?)
- Horizon Online if rumors are true that it's codeveloped/developed by Asian team (TBA, I bet 2025)
- Deviation's new IP (TBA, maybe cancelled or rebooted I'd say 2026)
- Project Boundary (China Hero Project)
- Lost Soul Aside (China Hero Project)
- Convallaria (China Hero Project)
- RAN: Lost Islands (China Hero Project)
- Exiledge (China Hero Project)
- AI-Limit (China Hero Project)
- Daba: Land of Water (China Hero Project)
- Dark Star (China Hero Project)
- The Wind Rising (China Hero Project)
- The God Slayer (China Hero Project)
- Awaken: Astral Blade (China Hero Project)
- Will-less (China Hero Project)
- Evotiction (China Hero Project)
- Unannounced Ballistic Moon (former Until Daw/Supermassive devs) new IP
The games I listed are 2nd party games. In most cases, the platform holder -in this case Sony- also owns the IP, but not always.
As an example, in many cases like smaller games, as maybe could be these China Hero Project games, the dev is the one who owns the IP and he role of the platform holder is basically only to support them with funding, publishing and marketing while at the exchange of some kind of exclusivity.
There are also cases like Nioh, where Sony only publishes in some specific markets and the dev keeps the IP and maybe publishes with them or someone else in other countries. There are also cases where Sony owns the IP and allows the dev publish the game with other publisher in other platform (cases of Death Stranding or Quantic Dream) or in other countries (the original Demon's Souls).