SCHEDULE 13G

PDF Solutions Inc

Common Stock, $0.00015 par value · CUSIP: 693282105

Event date: 2025-09-30

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• NEEDHAM INVESTMENT MANAGEMENT L.L.C.

  Shares: 2,018,550.00 · Class: 5.1%

• NEEDHAM ASSET MANAGEMENT, LLC

  Shares: 2,018,550.00 · Class: 5.1%

• NEEDHAM AGGRESSIVE GROWTH FUND

  Shares: 1,385,000.00 · Class: 3.5%

• NEEDHAM GROWTH FUND

  Shares: 293,550.00 · Class: 0.7%

• NEEDHAM SMALL CAP GROWTH FUND

  Shares: 340,000.00 · Class: 0.9%

• GEORGE A. NEEDHAM

  Shares: 2,018,550.00 · Class: 5.1%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.