Every Form 4 that PDF Solutions Inc (PDFS) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow PDFS and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full PDFS filings page.
PDF SOLUTIONS INC (PDFS) Chief Technology Officer Andrzej Strojwas reported an open-market sale of 3,394 shares of common stock on August 31, 2026. The shares were sold at a weighted average price of $44.41 per share, in multiple broker transactions between $44.37 and $44.43 per share.
Following this transaction, Strojwas directly holds 90,965 shares of PDFS common stock, which includes 156 shares purchased on July 31, 2026 under the PDF Employee Stock Purchase Plan. The filing’s Rule 10b5-1 checkbox indicates the trade was not reported as pursuant to a Rule 10b5-1 trading plan.
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.
PDF Solutions Inc. Chief Technology Officer Andrzej Strojwas reported routine equity compensation activity. He received a grant of 5,360 shares of common stock as a stock award, increasing his direct holdings. On the same date, 1,356 shares were withheld at $66.88 per share to cover tax obligations tied to vesting of restricted stock units, not sold in the market. After these transactions, he directly holds 94,203 shares of common stock.
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.
PDF Solutions director Michael B. Gustafson received a grant of 2,689 restricted stock units as part of the company’s Director Compensation Program. These RSUs convert into common shares over time rather than being purchased on the market.
The award vests in four equal installments of 25% each, on the first day of each calendar quarter following the Grant Effective Date, contingent on his continued board service. After this grant, Gustafson directly holds 40,192 shares of PDF Solutions common stock, reflecting routine equity-based compensation rather than an open-market transaction.
CHAN CHI-FOON reported acquisition or exercise transactions in this Form 4 filing.
PDF Solutions director Chi-Foon Chan received an equity award of 2,689 shares of common stock in the form of Restricted Stock Units (RSUs). The award was granted at no cash cost per share as part of the company’s Director Compensation Program.
The RSUs will vest in four equal installments of 25%, with vesting on the first day of each calendar quarter after the grant effective date, as long as Chan continues to serve through each vesting date. After this grant, Chan directly holds 24,168 shares of common stock.
BRONSON JOSEPH R reported acquisition or exercise transactions in this Form 4 filing.
PDF Solutions director Joseph R. Bronson received an equity award of 2,689 shares of Common Stock as a grant under the company’s Director Compensation Program. The award is in the form of Restricted Stock Units that vest in four equal quarterly installments, subject to his continued service.
After this grant, Bronson directly holds 40,956 shares of Common Stock reported in this filing.
PDF Solutions Inc. director Jane Li reported receiving an equity award in the form of restricted stock units. She was granted 2,689 shares of Common Stock at no cash cost as a grant/award acquisition, increasing her directly held position to 26,632 shares after the transaction.
The footnote explains these shares are an award of Restricted Stock Units (RSUs) under the company’s Director Compensation Program. The RSUs vest in four equal installments of 25% each, on the first day of each calendar quarter after the grant effective date, contingent on her continued board service through each vesting date.
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.
PDF Solutions EVP and CFO Adnan Raza reported routine equity compensation activity. He received a grant of 23,450 shares of common stock as a restricted stock unit award, boosting his direct holdings to 80,697 shares before tax-related adjustments.
To cover tax withholding on vesting of restricted stock units, 6,010 shares were disposed of back to the company at $66.88 per share, which the footnote clarifies was not a market sale. After this tax withholding, his direct ownership stood at 65,000 shares, and an additional 31,250 shares were held indirectly through a trust.
PDF Solutions Inc director and EVP of Products and Solutions reported a charitable donation of 5,070 shares of common stock on 12/09/2025. The transaction is coded as a gift at a reported price of $0 per share, reflecting transfers of 5,000 and 70 shares to two different institutions.
After this donation, the reporting person beneficially owns 1,542,072 shares of common stock indirectly through a trust and 28,298 shares indirectly through a spouse, indicating a substantial remaining ownership stake.