UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of Earliest Event Reported): May ~~April 23~~7, 2026

PDF SOLUTIONS, INC.

(Exact name of registrant as specified in its charter)

000-31311

(Commission File Number)

Delaware	25-1701361
(State or Other Jurisdiction of Incorporation)	(I.R.S. Employer Identification No.)

2858 De La Cruz Boulevard

Santa Clara, CA 95050

(Address of principal executive offices, with zip code)

(408) 280-7900

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Exchange Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $0.00015 par value	PDFS	The NASDAQ Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

~~Item~~Table ~~1.01 Entry~~of ~~Into a Material Definitive Agreement.~~Contents

OnTABLE ~~April~~OF 23, 2026, PDF Solutions, Inc. (the “Company”) entered into a First Amendment to Credit Agreement (the “Amendment”), by and among the Company, the subsidiary guarantors party thereto, the lenders party thereto and Wells Fargo Bank, National Association, as administrative agent to the lenders. The Amendment amends the Credit Agreement, dated as of March 7, 2025, by and among the Company, the lenders and other parties party thereto from time to time, and Wells Fargo Bank, National Association, as administrative agent (as amended, restated, supplemented, waived or otherwise modified from time to time, the “Credit Agreement”).CONTENTS

~~The~~Item ~~Amendment increases the revolving credit facility (the “Revolving Credit Facility”) to an aggregate principal amount of $75 million~~2. ~~The Amendment introduces leveraged-based adjustments to the annual Revolving Credit Facility commitment fee during the term of the Credit Agreement~~02. ~~Instead~~Results of aOperations ~~flat~~and ~~per~~Financial ~~annum~~Condition ~~rate~~Item ~~of 0~~9.~~50%, the Revolving Credit Facility commitment fee will be 0~~01.~~50%~~ ~~when~~Financial ~~the~~Statements ~~total debt to EBITDA ratio is greater than or equal to 2.50 to 1.00, 0.35% when the total debt to EBITDA ratio is less than 2.50 to 1.00 but greater than or equal to 0.50 to 1.00~~ and ~~0.20%~~Exhibits ~~when the total debt to EBITDA ratio is less than 0.50 to 1.00. All other material terms of the Credit Agreement remain unchanged.~~SIGNATURES

~~The~~Table ~~foregoing description~~ of the Credit Agreement is qualified in its entirety by reference to the full text of the Credit Agreement, which is filed as Exhibit 10.1 to this Current Report on Form 8-K and is incorporated herein by reference.Contents

Item 2.~~03 Creation~~02. Results of aOperations ~~Direct~~and Financial ~~Obligation or an Obligation Under an Off-Balance Sheet Arrangement of a Registrant~~Condition.

~~The~~On May 7, 2026, PDF Solutions, Inc. (the “Company”) issued a press release regarding its financial results and certain other information inrelated ~~Item~~to 1the first quarter ended March 31, 2026.01 The Company also posted on the Investors section of its website (www.pdf.com) a management report with regard to the first quarter ended March 31, 2026. Copies of the press release and management report are attached to this ~~Current~~report ~~Report~~as Exhibits 99.1 and 99.2, respectively. Information on ~~Form~~the ~~8-K~~website is ~~incorporated~~not, byand ~~reference~~will ~~into~~not be deemed, a part of this ~~Item~~report 2or incorporated into any other filings the Company makes with the Securities and Exchange Commission.~~03.~~

The information in this Item 92.0102, ~~Financial~~including ~~Statements~~Exhibits 99.1 and ~~Exhibits~~99.2, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities under that Section, and shall not be deemed incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.		Description
10.1		First Amendment to Credit Agreement, dated as of April 23, 2026, by and among PDF Solutions, Inc., the subsidiary guarantors party thereto, Wells Fargo Bank, National Association and the lenders who are party to the Agreement and the lenders who may become a party to the Agreement.
99.1		Press Release dated May 7, 2026, regarding financial results and certain other information related to the first quarter March 31, 2026.
104		Cover Page Interactive Data File (embedded within the Inline XBRL document).
99.2		Management Report by PDF Solutions, Inc. as of March 31, 2026.
104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, ~~as amended,~~ the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

PDF SOLUTIONS, INC. (Registrant) By: /s/ Adnan Raza Adnan Raza EVP, Finance, and Chief Financial Officer (~~Principal~~principal financial and accounting officer)

Dated: ~~April~~May 247, 2026

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