Founded in 1998, San Mateo Studio (formerly Foster City Studio) works out of San Mateo, California (shock I know).
Unlike the majority of PlayStation first-party developers, San Mateo are only a support studio. They therefore haven't shipped a PS5 game, nor should you expect them to.
They did spin off a small team in 2014 called Pixelopus who released two games before the PS5 launched, but a lack of sales resulted in Sony closing the studio down in June 2023.
Due to their support status, San Mateo haven't released a PS5 game where they were the main developer. This situation is also very unlikely to change if the shuttering of Pixelopus is any indication.
If you're looking for your next first-party PS5 game, you should probably look elsewhere.
