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US · SEC FORM 4
PDF SOLUTIONS INC
PDFS · Nasdaq · CIK 0001120914 · Technology · Software—Application
INSIDER SIGNAL
0 qualifying P purchase groups
in the current 180-day scoring window
12 Form 4 transaction lines observed in the same window
2 sales · 10 option, withholding, award, gift or other lines
WHY NO ACTIVE SIGNAL?
Score anatomy
No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.
Why is there no score?
- No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
- Sales and other Form 4 activity remain visible as context and do not create a negative score.
Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.
Insider activity timeline
Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.
Showing the six most active owners; 2 additional owner(s) remain in Form 4 evidence.
Purchase breadth, concentration & cluster buying
These modules activate when qualifying purchases enter the 180-day research window.
SIGNAL HISTORY
Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2025-05-13 · GUSTAFSON MICHAEL B.
Recent Form 4 activity
P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.
Market context
Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.
Short interest
Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.
- Shares short
- 3,541,446
- Previous report
- 3,248,816
- Avg daily volume
- 609,376
- Days to cover
- 5.8
FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.
Historical equity purchases
Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.
| Transaction date | Reporting owner | Type | Security | Shares | Avg. price | Approx. value | Source |
|---|---|---|---|---|---|---|---|
| 2025-05-13 | GUSTAFSON MICHAEL B | Purchase (P) | Common Stock | 7,500 | USD 19.45 | USD 145,875 | SEC filing ↗ |
| 2025-02-25 | KIBARIAN JOHN KACHIG | Purchase (P) | Common Stock | 15,644 | USD 22.11 | USD 345,889 | SEC filing ↗ |
| 2025-02-24 | KIBARIAN JOHN KACHIG | Purchase (P) | Common Stock | 34,356 | USD 22.80 | USD 783,317 | SEC filing ↗ |
| 2025-02-24 | GUSTAFSON MICHAEL B | Purchase (P) | Common Stock | 4,000 | USD 23.06 | USD 92,240 | SEC filing ↗ |
Form 4 evidence
15 transaction lines in the latest 365-day window; 164 in local history.
| Date | Owner | Type | Security | Shares | Avg. price | Approx. value | Source |
|---|---|---|---|---|---|---|---|
| 2026-08-31 | Strojwas Andrzej | Sale (S) | Common Stock | 3,394 | USD 44.41 | USD 150,728 | SEC filing ↗ |
| 2026-08-12 | Zhang Shuo | Sale (S) | Common Stock | 1,501 | USD 51.47 | USD 77,256 | SEC filing ↗ |
| 2026-07-01 | Zhang Shuo | Award / grant (A) | Common Stock | 2,689 | USD — | USD — | SEC filing ↗ |
Show recent Form 4 evidence (15 grouped rows)
| Date | Owner | Type | Security | Shares | Avg. price | Approx. value | Source |
|---|---|---|---|---|---|---|---|
| 2026-08-31 | Strojwas Andrzej | Sale (S) | Common Stock | 3,394 | USD 44.41 | USD 150,728 | SEC filing ↗ |
| 2026-08-12 | Zhang Shuo | Sale (S) | Common Stock | 1,501 | USD 51.47 | USD 77,256 | SEC filing ↗ |
| 2026-07-01 | Zhang Shuo | Award / grant (A) | Common Stock | 2,689 | USD — | USD — | SEC filing ↗ |
| 2026-07-01 | Strojwas Andrzej | Tax withholding (F) | Common Stock | 1,356 | USD 66.88 | USD 90,689 | SEC filing ↗ |
| 2026-07-01 | Strojwas Andrzej | Award / grant (A) | Common Stock | 5,360 | USD — | USD — | SEC filing ↗ |
| 2026-07-01 | Raza Adnan | Tax withholding (F) | Common Stock | 6,010 | USD 66.88 | USD 401,949 | SEC filing ↗ |
| 2026-07-01 | Raza Adnan | Award / grant (A) | Common Stock | 23,450 | USD — | USD — | SEC filing ↗ |
| 2026-07-01 | Li Ye Jane | Award / grant (A) | Common Stock | 2,689 | USD — | USD — | SEC filing ↗ |
| 2026-07-01 | GUSTAFSON MICHAEL B | Award / grant (A) | Common Stock | 2,689 | USD — | USD — | SEC filing ↗ |
| 2026-07-01 | Erba Nancy | Award / grant (A) | Common Stock | 2,689 | USD — | USD — | SEC filing ↗ |
| 2026-07-01 | CHAN CHI-FOON | Award / grant (A) | Common Stock | 2,689 | USD — | USD — | SEC filing ↗ |
| 2026-07-01 | BRONSON JOSEPH R | Award / grant (A) | Common Stock | 2,689 | USD — | USD — | SEC filing ↗ |
| 2026-01-01 | Strojwas Andrzej | Tax withholding (F) | Common Stock | 2,762 | USD 28.53 | USD 78,800 | SEC filing ↗ |
| 2026-01-01 | Raza Adnan | Tax withholding (F) | Common Stock | 5,498 | USD 28.53 | USD 156,858 | SEC filing ↗ |
| 2025-12-09 | MICHAELS KIMON | Gift (G) | Common Stock | 5,070 | USD 0.00 | USD 0 | SEC filing ↗ |
Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.
Snapshot & identity
| Snapshot date | 2026-10-18 |
|---|---|
| Ranking version | US-v1.2 |
| Data quality | PASS ELIGIBLE · — |
| Ticker | PDFS |
| CIK | 0001120914 |
| Sector | Technology |
| Industry | Software—Application Yahoo Finance |
| SEC SIC | 7372 Services-Prepackaged Software |
| Exchange | Nasdaq |
Data coverage
| Local Form 4 history | 164 transaction lines from 2020-01-01 to 2026-08-31 4 P purchase lines · 36 S sale lines · 124 other lines |
|---|---|
| SEC company submissions | Open SEC filings ↗ |
Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.