John Kibarian (PDFS) discloses 6.5% beneficial stake in PDF Solutions via trust

Rhea-AI Filing Summary

PDF Solutions Inc. received an updated ownership report from John Kachig Kibarian, filed on Schedule 13G/A. As of the event date of December 31, 2025, he beneficially owned 2,562,474 shares of common stock, representing 6.5% of the outstanding class.

Of this amount, 39,718 shares are subject to his sole voting and dispositive power. The remaining 2,522,756 shares are subject to shared voting and dispositive power through The John Kibarian and Gloria Chen Trust, where he serves as a trustee.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 21)

PDF SOLUTIONS INC

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

693282105

(CUSIP Number)

12/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 693282105

1

Names of Reporting Persons

KIBARIAN JOHN KACHIG

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 39,718.00
6	Shared Voting Power 2,522,756.00
7	Sole Dispositive Power 39,718.00
8	Shared Dispositive Power 2,522,756.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,562,474.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.5 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: Shared Voting and Dispositive Power refer to shares held in The John Kibarian and Gloria Chen Trust (the "Trust") for which Mr. Kibarian is a trustee.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: PDF SOLUTIONS INC
(b)	Address of issuer's principal executive offices: 2858 DE LA CRUZ BOULEVARD, SANTA CLARA, CALIFORNIA, 95050.
Item 2.
(a)	Name of person filing: John Kachig Kibarian
(b)	Address or principal business office or, if none, residence: 2858 De La Cruz Boulevard, Santa Clara, CA 95050
(c)	Citizenship: United States
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: 693282105
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 2,562,474
(b)	Percent of class: 6.5 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 39,718
	(ii) Shared power to vote or to direct the vote: 2,522,756
	(iii) Sole power to dispose or to direct the disposition of: 39,718
	(iv) Shared power to dispose or to direct the disposition of: 2,522,756
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.	Certifications:
	Not Applicable

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

KIBARIAN JOHN KACHIG

Signature:	/s/ JOHN KACHIG KIBARIAN
Name/Title:	JOHN KACHIG KIBARIAN
Date:	02/17/2026

FAQ

What did the PDFS Schedule 13G/A filed by John Kachig Kibarian report?

The filing reported that John Kachig Kibarian beneficially owned 2,562,474 shares of PDF Solutions common stock, equal to 6.5% of the class, as of December 31, 2025. It also detailed how many shares he controls solely versus through a trust.

How many PDFS shares does John Kachig Kibarian beneficially own?

He beneficially owns 2,562,474 shares of PDF Solutions common stock. This total combines 39,718 shares over which he has sole voting and dispositive power and 2,522,756 shares over which he shares voting and dispositive power via a trust.

What percentage of PDF Solutions (PDFS) does John Kachig Kibarian own?

He reported beneficial ownership of 6.5% of PDF Solutions’ common stock. This percentage is based on 2,562,474 shares as of the December 31, 2025 measurement date, exceeding the 5% threshold that triggers Schedule 13G reporting requirements.

How are John Kachig Kibarian’s PDFS shares held and controlled?

He has sole voting and dispositive power over 39,718 shares and shared power over 2,522,756 shares. The shared voting and dispositive power relate to shares held in The John Kibarian and Gloria Chen Trust, where he acts as a trustee.

Why is John Kachig Kibarian filing a Schedule 13G/A for PDF Solutions?

Because his beneficial ownership in PDF Solutions common stock is above 5%, U.S. securities rules require a beneficial ownership report. The Schedule 13G/A amendment updates his ownership details, including share counts, percentage of class, and control through a trust.

What is the event date for John Kachig Kibarian’s ownership report on PDFS?

The reported date of the event requiring the Schedule 13G/A filing is December 31, 2025. Ownership figures such as the 2,562,474 shares and 6.5% of the class are measured as of this specific event date.