PDF Solutions (PDFS) director Shuo Zhang awarded 2,689 RSUs in equity grant

Rhea-AI Filing Summary

Zhang Shuo reported acquisition or exercise transactions in this Form 4 filing.

PDF Solutions Inc. reported that director Shuo Zhang received an equity grant of 2,689 shares of Common Stock as a compensation award. These shares are structured as Restricted Stock Units that carry no cash purchase price.

The award will vest in four equal installments of 25% of the total RSUs, with vesting on the first day of each calendar quarter after the grant effective date, contingent on continued board service. Following this grant, Zhang directly holds 24,881 shares of the company’s common stock.

Insights

Equity compensation analyst

Routine director RSU grant with quarterly vesting and no cash purchase.

Director Shuo Zhang received 2,689 Restricted Stock Units in Common Stock, recorded as an acquisition under a grant or award. The award is part of the company’s Director Compensation Program, indicating a standard, compensation-driven equity grant rather than a market transaction.

The RSUs vest in four equal 25% installments on the first day of each calendar quarter after the grant’s effective date, subject to continued service. After this grant, Zhang directly owns 24,881 shares, suggesting this is a modest, ongoing component of director compensation rather than a thesis-changing event.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Zhang Shuo

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	2,689	$0.00	--

Holdings After Transaction: Common Stock — 24,881 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

RSU grant size: 2,689 shares Post-grant holdings: 24,881 shares Grant price per share: $0.00 per share +1 more

4 metrics

RSU grant size 2,689 shares Restricted Stock Units awarded to director Shuo Zhang

Post-grant holdings 24,881 shares Total Common Stock directly held after transaction

Grant price per share $0.00 per share Stated transaction price for RSU award

Vesting installments 4 installments of 25% Quarterly vesting schedule for Total RSUs

Key Terms

Restricted Stock Units, Director Compensation Program, vesting, grant/award acquisition

4 terms

Restricted Stock Units financial

"These shares represent an award of Restricted Stock Units (Total RSU) under the Company's Director Compensation Program."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Director Compensation Program financial

"These shares represent an award of Restricted Stock Units (Total RSU) under the Company's Director Compensation Program."

vesting financial

"RSU shall vest in four (4) equal installments of twenty-five percent (25%) of the Total RSUs, with vesting occurring on the first day of each calendar quarter"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

grant/award acquisition financial

"transaction_action": "grant/award acquisition""

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/02/2026 - 04:45 PM Accepted by SEC EDGAR 07/02/2026 - 04:44 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)
07/01/2026

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	07/01/2026		A		2,689(1)	A	(1)	24,881	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:

1. These shares represent an award of Restricted Stock Units (Total RSU) under the Company's Director Compensation Program. RSU shall vest in four (4) equal installments of twenty-five percent (25%) of the Total RSUs, with vesting occurring on the first day of each calendar quarter following the Grant Effective Date until fully vested, subject to the Recipient's continued service through each applicable vesting date.

	/s/ Adnan Raza, Attorney-In-Fact for Shuo Zhang	07/02/2026
	** 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)

FAQ

What did PDFS director Shuo Zhang report in this Form 4 filing?

Shuo Zhang reported receiving 2,689 shares of Common Stock as a Restricted Stock Unit award. The grant comes under PDF Solutions’ Director Compensation Program and represents an equity-based compensation acquisition, not an open-market stock purchase or sale.

How many PDF Solutions (PDFS) shares does Shuo Zhang hold after this grant?

After the reported grant, Shuo Zhang directly holds 24,881 shares of PDF Solutions Common Stock. This figure includes the newly awarded 2,689 Restricted Stock Units, reflecting the director’s updated equity position as shown in the Form 4 filing.

Is the 2,689-share PDFS award to Shuo Zhang an RSU grant?

Yes. The 2,689-share award is explicitly described as Restricted Stock Units under the company’s Director Compensation Program. The RSUs represent a form of deferred equity compensation that vests over time, rather than an immediate cash purchase of common stock.

What is the vesting schedule for Shuo Zhang’s 2,689 PDFS RSUs?

The 2,689 Restricted Stock Units vest in four equal installments of 25% each. Vesting occurs on the first day of each calendar quarter following the grant effective date, and requires Zhang to continue serving through each applicable vesting date.

Did Shuo Zhang buy or sell PDF Solutions (PDFS) shares on the open market?

No open-market buy or sell is reported. The Form 4 shows a grant or award acquisition of 2,689 shares via Restricted Stock Units at a stated price of $0.00 per share, consistent with stock-based compensation rather than a trading transaction.

Does this Form 4 indicate any remaining PDFS derivative positions for Shuo Zhang?

No derivative positions are listed. The derivative section of the filing is empty, and the transaction summary shows no derivative exercises, meaning the report focuses solely on this non-derivative RSU-based Common Stock award.