PDF SOLUTIONS INC 10-Q

Item 5. Other Information None. INDEX TO EXHIBITS ​ 36 Table of Contents Item 6. Exhibits ​ Exhibit Number Description ​ ​ ​ 31.01 Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.† 31.02 Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.† 32.01 Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.** 32.02 Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.** 101 The following financial statements from the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023, formatted in Inline XBRL: (i) Condensed Consolidated Balance Sheets, (ii) Condensed Consolidated Statements of Comprehensive Income (Loss), (iii) Condensed Consolidated Statements of Stockholders’ Equity, (iv) Condensed Consolidated Statements of Cash Flows and (v) Notes to Condensed Consolidated Financial Statements, tagged as blocks of text and including detailed tags.† 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).† † Filed herewith. ** Furnished, and not filed. ​ ​ ​ 37 Table of Contents SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. ​ ​ PDF SOLUTIONS, INC. ​ ​ ​ ​ ​ ​ Date: May 9, 2023 By: /s/ JOHN K. KIBARIAN ​ ​ John K. Kibarian ​ ​ President and Chief Executive Officer ​ ​ (principal executive officer) ​ ​ ​ ​ ​ ​ Date: May 9, 2023 By: /s/ ADNAN RAZA ​ ​ Adnan Raza ​ ​ Executive Vice President, Finance and Chief ​ ​ Financial Officer ​ ​ (principal financial and accounting officer) ​ ​ ​ ​ ​ ​ ​ ​ 38