PDF Solutions
PDFS · NASDAQ
$41.18−$0.04 (−0.10%)TodayMarket closed ·
Prev close $41.22
Who owns PDFS
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 47.6% of PDFS’s shares.
- BlackRock Institutional Trust Company, N.A.12.1%
- Kibarian (John Kachig)6.1%
- Needham Investment Management L.L.C.4.9%
- Vanguard Capital Management, LLC4.0%
- Next 6 largest institutions20.5%
- All other shareholders52.4%
| Holder | Shares | % of shares |
|---|---|---|
| BlackRock Institutional Trust Company, N.A. | 5.07M | 12.11% |
| Kibarian (John Kachig) | 2.56M | 6.12% |
| Needham Investment Management L.L.C. | 2.06M | 4.93% |
| Vanguard Capital Management, LLC | 1.66M | 3.98% |
| Michaels (Kimon W) | 1.57M | 3.75% |
| Vanguard Portfolio Management, LLC | 1.46M | 3.48% |
| Emerald Advisers LLC | 1.45M | 3.47% |
| State Street Investment Management (US) | 1.39M | 3.31% |
| Wasatch Global Investors Inc | 1.38M | 3.30% |
| Barrow Hanley Global Investors | 1.32M | 3.15% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| iShares Core S&P Small-Cap ETF | 2.30M | 5.49% |
| Needham Aggressive Growth Fund | 1.71M | 4.07% |
| Vanguard Total Stock Market Index Fund | 1.20M | 2.86% |
| iShares Russell 2000 ETF | 859.16K | 2.05% |
| Vanguard Information Technology Index Fund | 788.72K | 1.88% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $227.98K (2 trades) of PDFS on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Strojwas Andrzej | Sale | 3.39K | $150.73K |
| Zhang Shuo | Sale | 1.50K | $77.26K |
| Strojwas Andrzej | Award | 5.36K | — |
| Strojwas Andrzej | Tax withholding | 1.36K | $90.69K |
| Zhang Shuo | Award | 2.69K | — |
| GUSTAFSON MICHAEL B | Award | 2.69K | — |
| CHAN CHI-FOON | Award | 2.69K | — |
| BRONSON JOSEPH R | Award | 2.69K | — |
| Li Ye Jane | Award | 2.69K | — |
| Erba Nancy | Award | 2.69K | — |
Short interest
Settled Sep 30, 2026
- Shares short
- 3.54M
- Days to cover
- 5.81
- % of shares outstanding
- 8.46%
- Average daily volume
- 609.38K
- Change since last report
- +9.0%
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