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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. held its 2026 Annual Meeting of Stockholders on June 16, 2026. Stockholders elected Class I directors Joseph R. Bronson and Ye Jane Li, each receiving over 29 million votes in favor, with additional broker non-votes recorded.
Stockholders also ratified BPM LLP as the independent registered public accounting firm for the year ending December 31, 2026. They approved the Eleventh Amended and Restated 2011 Stock Incentive Plan and the Third Amended and Restated 2021 Employee Stock Purchase Plan, and gave non-binding advisory approval of 2025 compensation for Named Executive Officers.
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.