| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Director
1 company
Shuo Zhang is Director at PDFS. Shuo Zhang's net worth is not public. Form 4 filings only show shares in the companies where this person is an insider; those holdings are worth an estimated $986K at current prices.
Our model assigns Shuo Zhang a middling insider score of 51/100, based on 4 past trades. Over a 12-month horizon, 50.0% of those trades were profitable, with an average 12-month return of +0.6%.
The PDFS filings lean toward selling, a net 23,065 shares.
Shuo Zhang has 13 Form 4 filings on record from August 2019 to August 2026, all as Director at PDF Solutions (PDFS), 2019–2026.
The 13 reported transactions were 8 stock awards and 5 open-market sales.
Counted by filing, the open-market trades come to no purchases and 5 sales worth about $711K.
The largest open-market sale was 11,017 shares of PDFS at an average $25.50 on March 15, 2022, about $281K. Twelve months later PDFS was up 48%.
None of the 3 sales since April 2023 was marked as made under a Rule 10b5-1 trading plan.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Aug 12, 2026 | PDFS Pdf Solutions, Inc. | Director | Sell | 1,501 | $51.47 | $77,256.47 | -6.0% | - | - | |
| Jun 3, 2024 | PDFS Pdf Solutions Inc | Director | Sell | 5,500 | $34.66 | $190,630.00 | -34.6% | -15.9% | -46.6% | |
| Aug 18, 2023 | PDFS Pdf Solutions Inc | Director | Sell | 3,047 | $33.75 | $102,836.25 | -16.1% | -9.9% | -5.1% | |
| Nov 16, 2022 | PDFS Pdf Solutions Inc | Director | Sell | 2,000 | $29.84 | $59,680.00 | -11.4% | +10.3% | +1.2% | |
| Mar 15, 2022 | PDFS Pdf Solutions Inc | Director | Sell | 11,017 | $25.50 | $280,933.50 | -51.5% | -18.8% | +48.0% |