Advantest (PDFS) Amendment: Reports 0 Shares Beneficially Owned

Rhea-AI Filing Summary

PDF Solutions, Inc. Schedule 13G/A Amendment No. 1 shows that Advantest America, Inc. and Advantest Corporation report 0 shares beneficially owned of PDF Solutions common stock (CUSIP 693282105), representing 0% of the class. The filing lists no voting or dispositive power for either reporting person and is signed by company officers on 05/27/2026.

Insights

Corporate Governance Analyst

Amendment confirms no beneficial ownership by Advantest entities.

The Schedule 13G/A Amendment states both Advantest America, Inc. and Advantest Corporation beneficially own 0 shares and have 0 sole or shared voting and dispositive power as of the filing. This is a declarative ownership update, not an acquisition or disposition.

Materiality is low: the filing documents a non‑holding position; subsequent filings would be required to show any change in ownership.

Key Figures

CUSIP: 693282105 Shares beneficially owned: 0 shares Percent of class: 0% +2 more

5 metrics

CUSIP 693282105 Common Stock class identifier

Shares beneficially owned 0 shares Amount beneficially owned by Advantest entities as reported

Percent of class 0% Percent of common stock class beneficially owned

Par value $0.00015 per share Common Stock par value stated in the filing

Signature date 05/27/2026 Date signatures were executed on the amendment

Key Terms

Schedule 13G/A, Beneficially owned, Dispositive power

3 terms

Schedule 13G/A regulatory

"This Amendment No. 1 to the filed on August 6, 2020"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Beneficially owned regulatory

"Item 4. | Ownership (a) | Amount beneficially owned: 0"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Dispositive power regulatory

"7 | Sole Dispositive Power 0.00 8 | Shared Dispositive Power 0.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

PDF Solutions, Inc.

(Name of Issuer)

Common Stock, par value $0.00015 per share

(Title of Class of Securities)

693282105

(CUSIP Number)

05/15/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 693282105

1

Names of Reporting Persons

Advantest America, Inc.

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

CUSIP Number(s): 693282105

1

Names of Reporting Persons

Advantest Corporation

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

JAPAN

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: PDF Solutions, Inc.
(b)	Address of issuer's principal executive offices: 2858 De La Cruz Blvd. Santa Clara, CA 95050
Item 2.
(a)	Name of person filing: This Amendment No. 1 to the Schedule 13G filed on August 6, 2020, is filed by the following reporting persons: (i) Advantest America, Inc. (ii) Advantest Corporation
(b)	Address or principal business office or, if none, residence: The business address for Advantest America, Inc. is 3061 Zanker Road, San Jose, California 95134. The business address for Advantest Corporation is Shin Marunouchi Center Bldg., 1-6-2, Marunouchi, Chiyoda-ku, Tokyo 100-0005.
(c)	Citizenship: Advantest America, Inc. is incorporated in Delaware. Advantest Corporation is incorporated in Japan.
(d)	Title of class of securities: Common Stock, par value $0.00015 per share
(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: 0
(b)	Percent of class: 0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

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.

Advantest America, Inc.

Signature:	/s/ Keith Hardwick
Name/Title:	Keith Hardwick / Chief Executive Officer
Date:	05/27/2026

Advantest Corporation

Signature:	/s/ Koichi Tsukui
Name/Title:	Koichi Tsukui / President, Representative Director
Date:	05/27/2026

FAQ

What does PDFS Schedule 13G/A Amendment No. 1 state about Advantest ownership?

The filing states Advantest America, Inc. and Advantest Corporation beneficially own 0 shares of PDF Solutions common stock, representing 0% of the class, with no voting or dispositive power.

Who filed the Schedule 13G/A Amendment for PDFS?

The amendment was filed by Advantest America, Inc. and Advantest Corporation, listing their business addresses in San Jose, California and Tokyo, Japan respectively, and signed on 05/27/2026.

Does the Schedule 13G/A Amendment show any shares controlled or voted by Advantest?

No. The filing reports 0 sole voting power, 0 shared voting power, 0 sole dispositive power, and 0 shared dispositive power for both reporting persons.

What class of security is covered by this PDFS filing?

The filing covers PDF Solutions common stock, par value $0.00015 per share, CUSIP 693282105, as stated in Item 1(d) of the Schedule 13G/A Amendment.

When were the signatures on this Schedule 13G/A Amendment executed?

The amendment is signed by Keith Hardwick and Koichi Tsukui with signature dates shown as 05/27/2026, reflecting the reporting persons' attestations to the form.