Pdf Solutions Inc. (PDFS) Insider Trading

Last 12 months

Insiders sold $228k and bought nothing on the open market.

None of the selling was scheduled in advance under a 10b5-1 plan. The last open-market buy by an executive or director was in May 2025.

Net open-market

−$228k

0 buys · 2 sales

Under a 10b5-1 plan

of the value sold

Insiders who bought / sold

0 / 2

executives and directors

Last open-market buy

May 2025

May 13, 2025

Get an email when PDFS's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Aug 31	Andrzej Strojwas Chief Technology Officer	SoldNo plan	3,394	$44.41	$151k	3.6%	Form 4
Aug 12	Shuo Zhang Director	SoldNo plan	1,501	$51.47	$77k	6.0%	Form 4
May 13, 2025	Michael B Gustafson Director	Bought	7,500	$19.45	$146k	33%	Form 4
Feb 24, 2025 – Feb 25, 2025	John Kachig Kibarian PRESIDENT AND CEO	Bought 2 parts	50,000	$22.58 average	$1.13M	2.0%	Form 4
Feb 24, 2025	Michael B Gustafson Director	Bought	4,000	$23.06	$92k	22%	Form 4
Dec 17, 2024	Andrzej Strojwas CTO	SoldNo plan 2 parts	6,253	$30.39 average	$190k	6.6%	Form 4
Dec 16, 2024	Andrzej Strojwas CTO	SoldNo plan	5,030	$30.85	$155k	5.0%	Form 4
Dec 11, 2024	Nancy Erba Director	SoldNo plan	2,000	$30.81	$62k	5.6%	Form 4

Aug 31No plan
Andrzej Strojwas
Chief Technology Officer · sold 3,394 at $44.41
$151k
3.6% of stake
Aug 12No plan
Shuo Zhang
Director · sold 1,501 at $51.47
$77k
6.0% of stake
May 13, 2025
Michael B Gustafson
Director · bought 7,500 at $19.45
$146k
33% of stake
Feb 24, 2025 – Feb 25, 2025
John Kachig Kibarian
PRESIDENT AND CEO · bought 50,000 at avg $22.58
$1.13M
2.0% of stake
Feb 24, 2025
Michael B Gustafson
Director · bought 4,000 at $23.06
$92k
22% of stake
Dec 17, 2024No plan
Andrzej Strojwas
CTO · sold 6,253 at avg $30.39
$190k
6.6% of stake
Dec 16, 2024No plan
Andrzej Strojwas
CTO · sold 5,030 at $30.85
$155k
5.0% of stake
Dec 11, 2024No plan
Nancy Erba
Director · sold 2,000 at $30.81
$62k
5.6% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch PDFS, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in PDFS's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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