SEC Form 4
PDF Solutions Inc (PDFS) insider trading
In the 12 months to Oct 26, 2026, 2 PDFS insiders reported open-market sales of $228.0K across 2 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $228.0K
- 2 filings · 2 insiders
- Open-market purchases
- $0
- 0 filings
Who traded PDFS, and when
- Sale
PDFS daily close from Oct 27, 2025 to Oct 26, 2026, between $23.97 and $70.79, last $41.18. 2 sale and 0 purchase filings by 2 insiders, marked at their filing dates. Andrzej Strojwas, Chief Technology Officer: sold $150.7K across 1 filing, first filed Sep 1, 2026, last Sep 1, 2026. Shuo Zhang, Director: sold $77.3K across 1 filing, first filed Aug 12, 2026, last Aug 12, 2026.
Largest mark · tap a row for others
Andrzej Strojwas · Chief Technology Officer
Sale $150,728
3,394 shares at $44.41 avg
Filed Sep 1, 2026 · traded Aug 31
Close on filing date $41.79
Andrzej Strojwas · Chief Technology Officer
Chief Technology Officer
$150.7K soldShuo Zhang · Director
Director
$77.3K soldOpen-market trades
2 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Andrzej Strojwas | Chief Technology Officer | $150.7K | — | 1 | — | |
| Shuo Zhang | Director | $77.3K | — | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Andrzej Strojwas Chief Technology Officer | Sale | 3,394 | $44.41 | $150.7K | 90,965 | |
traded | Shuo Zhang Director | Sale | 1,501 | $51.47 | $77.3K | 23,380 |
GET /stocks/filings/vX/form-4?tickers=PDFS&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"PDFS"
],
"issuer_cik": "0001120914",
"owner_cik": "0001892306",
"accession_number": "0001437749-26-029384",
"form_type": "4",
"filing_date": "2026-09-01",
"period_of_report": "2026-08-31",
"issuer_name": "PDF SOLUTIONS INC",
"issuer_trading_symbol": "PDFS",
"owner_name": "Strojwas Andrzej",
"is_officer": true,
"officer_title": "Chief Technology Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-08-31",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 3394,
"transaction_price_per_share": 44.41,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 90965,
"transaction_value": 150727.53999999998,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "Average weighted sale price for shares disposed of in the reported transaction. The shares were sold in multiple brokers' transactions at various market prices per share ranging from $44.37 to $44.43."
},
{
"id": "F2",
"description": "Includes 156 shares of common stock that were purchased on July 31, 2026 under the PDF Employee Stock Purchase Plan."
}
]
},
{
"tickers": [
"PDFS"
],
"issuer_cik": "0001120914",
"owner_cik": "0001782026",
"accession_number": "0001437749-26-027449",
"form_type": "4",
"filing_date": "2026-08-12",
"period_of_report": "2026-08-12",
"issuer_name": "PDF SOLUTIONS INC",
"issuer_trading_symbol": "PDFS",
"owner_name": "Zhang Shuo",
"is_director": true,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-08-12",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 1501,
"transaction_price_per_share": 51.47,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 23380,
"transaction_value": 77256.47,
"direct_or_indirect": "D"
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 13 records
- Tax withholding4 records
- Grants and awards8 records
- Gifts1 record
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has PDF Solutions Inc's CEO sold stock?
No. John Kachig Kibarian (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is PDFS’s insider data?
These are PDFS Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
Build with AI
Track PDFS insider trades with your agent
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for PDFS every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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