144 0001667921 XXXXXXXX LIVE 0001120914 PDF Solutions Inc 000-31311 2858 DE LA CRUZ BOULEVARD Santa Clara CA 95050 4082807900 Li Revocable Trust Director Common Stock UBS Financial Services Inc

1000 Harbor Blvd 3rd Floor Weehawken NJ 07086

11184 385848 38260000 02/23/2024 NASDAQ Common Stock 12/01/2021 RSU Vesting Issuer N 3188 12/01/2021 NA Common Stock 07/01/2022 RSU Vesting Issuer N 601 07/01/2022 NA Common Stock 08/01/2022 RSU Vesting Issuer N 601 08/01/2022 NA Common Stock 09/01/2022 RSU Vesting Isssuer N 601 09/01/2022 NA Common Stock 10/01/2022 RSU Vesting Issuer N 601 10/01/2022 NA Common Stock 11/01/2022 RSU Vesting Issuer N 601 11/01/2022 NA Common Stock 12/01/2022 RSU Vesting Issuer N 3789 12/01/2022 NA Common Stock 01/01/2023 RSU Vesting Issuer N 601 01/01/2023 NA Common Stock 02/01/2023 RSU Vesting Issuer N 601 02/01/2023 NA Y Li Revocable trust is the seller. Ye Jane Li is the trustee and is a director of PDF Solutions Inc. 02/23/2024 /s/ UBS Financial Services Inc, as attorney-in-fact for Li Revocable Trust