PDF Solutions (PDFS) director Shuo Zhang sells 1,501 shares at $51.47

Rhea-AI Filing Summary

PDF Solutions Inc. director Shuo Zhang reported a sale of 1,501 shares of common stock on 2026-08-12 in an open-market or private transaction at $51.47 per share. Following this transaction, Zhang directly holds 23,380 shares of PDF Solutions common stock. The transaction was not marked as made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Net Seller: 1,501 shares

Net Sell 1 txn

Insider Zhang Shuo

Role Director

Sold 1,501 shs ($77K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,501	$51.47	$77K

Holdings After Transaction: Common Stock — 23,380 shares (Direct)

Key Figures

Shares sold: 1,501 shares Sale price per share: $51.47 Shares owned after sale: 23,380 shares +1 more

4 metrics

Shares sold 1,501 shares Common stock sale on 2026-08-12 by director Shuo Zhang

Sale price per share $51.47 Price per share for the 1,501-share common stock sale

Shares owned after sale 23,380 shares Direct common stock holdings of Shuo Zhang following the transaction

Transactions marked under Rule 10b5-1 0 Filing checkbox shows no transactions affirmed under a 10b5-1 plan

Key Terms

Common Stock, non-derivative, Sale in open market or private transaction

3 terms

Common Stock financial

"security_title: "Common Stock" for the reported sale"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

non-derivative financial

"transaction_type is listed as "non-derivative" for this trade"

Sale in open market or private transaction financial

"transaction_code_description: "Sale in open market or private transaction""

FAQ

What insider transaction did PDF Solutions (PDFS) director Shuo Zhang report?

Director Shuo Zhang sold 1,501 shares of PDF Solutions common stock on 2026-08-12. The sale was reported as an open-market or private transaction at $51.47 per share.

At what price did Shuo Zhang sell PDF Solutions (PDFS) shares?

Shuo Zhang sold PDF Solutions common stock at $51.47 per share. The Form 4 describes the transaction as a sale in an open market or private transaction on 2026-08-12.

How many PDF Solutions (PDFS) shares does Shuo Zhang own after this sale?

After the sale, Shuo Zhang directly owns 23,380 shares of PDF Solutions common stock. This post-transaction holding reflects the position remaining following the 1,501-share sale reported.

Was the PDF Solutions (PDFS) insider sale under a Rule 10b5-1 plan?

The transaction was not indicated as under a Rule 10b5-1 plan. The filing’s Rule 10b5-1 checkbox is not marked as affirming plan status for the reported sale.

What is the size of Shuo Zhang’s PDF Solutions (PDFS) share sale?

The reported transaction covers 1,501 shares of PDF Solutions common stock. Based on the $51.47 per-share sale price, it represents a mid-sized single trade by the director.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/12/2026 - 09:33 PM Accepted by SEC EDGAR 08/12/2026 - 09:32 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Zhang Shuo

(Last) (First) (Middle)

2858 DE LA CRUZ BLVD.

(Street)

SANTA CLARA CALIFORNIA 95050

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
PDF SOLUTIONS INC [ PDFS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/12/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/12/2026		S		1,501	D	$51.47	23,380	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Adnan Raza, Attorney-in-Fact for Shuo Zhang	08/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)