PDF Solutions director awarded 2,689 RSUs

Erba Nancy reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Erba Nancy reported acquisition or exercise transactions in this Form 4 filing.

PDF Solutions director Nancy Erba reported a compensation-related stock grant. She received an award of 2,689 shares of Common Stock in the form of Restricted Stock Units at no cost under the company’s Director Compensation Program.

The RSUs vest in four equal installments of twenty-five percent on the first day of each calendar quarter following the grant effective date, contingent on her continued service. Following this award, she holds 11,943 shares directly and 31,868 shares indirectly through a trust, reflecting routine equity compensation rather than an open-market purchase or sale.

Insider Trade Summary

Grant/Award: 2,689 shares

Grant/Award 2 txns

Insider Erba Nancy

Role Director

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

Holdings After Transaction: Common Stock — 11,943 shares (Direct); Common Stock — 31,868 shares (Indirect, By Trust)

Footnotes (1)

1. F1. 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.

Key Figures

RSU grant: 2,689 shares Direct holdings after grant: 11,943 shares Indirect holdings by trust: 31,868 shares +1 more

4 metrics

RSU grant 2,689 shares Restricted Stock Units awarded to director Nancy Erba

Direct holdings after grant 11,943 shares Common Stock directly owned following the RSU award

Indirect holdings by trust 31,868 shares Common Stock held indirectly through a trust

Vesting schedule 4 installments of 25% Quarterly vesting of Total RSUs after grant effective date

Key Terms

Restricted Stock Units, Director Compensation Program, vesting, By Trust

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.

By Trust financial

"total_shares_following_transaction 31868.0000, direct_or_indirect I, nature_of_ownership By Trust"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did PDF Solutions (PDFS) director Nancy Erba report in this Form 4?

Nancy Erba reported a compensation-related equity award rather than a market trade. She received 2,689 Restricted Stock Units of PDF Solutions Common Stock at no cost, under the company’s Director Compensation Program, with vesting tied to her continued service on the board over future quarters.

How many RSUs did Nancy Erba receive from PDF Solutions (PDFS)?

She received 2,689 Restricted Stock Units of PDF Solutions Common Stock. The award is part of the company’s Director Compensation Program and carries no purchase price. These RSUs convert into shares as they vest over time, increasing her equity-based compensation stake in the company.

How will Nancy Erba’s new RSU grant at PDF Solutions (PDFS) vest?

The RSU award vests in four equal installments of twenty-five percent each. Vesting occurs on the first day of each calendar quarter after the grant effective date, provided she continues serving through each vesting date, gradually delivering the underlying Common Stock over those quarters.

What are Nancy Erba’s PDF Solutions (PDFS) share holdings after this Form 4?

After the reported transactions, she holds 11,943 shares of Common Stock directly. She also has 31,868 shares held indirectly through a trust. Together, these positions reflect her combined direct and indirect equity exposure to PDF Solutions following the RSU grant.

Does this Form 4 show any open-market buying or selling of PDF Solutions (PDFS) shares?

No open-market purchases or sales are reported in this Form 4. The main reportable event is an award of 2,689 Restricted Stock Units as director compensation, along with an updated disclosure of 31,868 shares held indirectly by a trust associated with Nancy Erba.

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

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Accepted by SEC EDGAR 07/02/2026 - 04:29 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^*

Erba Nancy

(Last) (First) (Middle)

2858 DE LA CRUZ BOULEVARD

(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)	11,943	D
Common Stock								31,868	I	By Trust

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 Nancy Erba	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)