PDF SOLUTIONS INC
Total Trades
21
Buys
3
Sells
17
Largest Trade
N/A
Insiders
9
Institutional Funds
152
Inst. Value
$1M+
Activist Filings
16
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| GUSTAFSON MICHAEL B | Director | BUY | $100K–$500K | 8K | $19.45 | May 14, 2025 |
| GUSTAFSON MICHAEL B | Director | BUY | $50K–$100K | 4K | $23.06 | Feb 26, 2025 |
| KIBARIAN JOHN KACHIG | PRESIDENT AND CEO | BUY | $1M+ | 50K | $22.58 | Feb 26, 2025 |
| Zhang Shuo | Director | SELL | $100K–$500K | 6K | $34.66 | Jun 4, 2024 |
| Li Ye Jane | Director | SELL | $100K–$500K | 11K | $33.37 | Feb 27, 2024 |
| BRONSON JOSEPH R | Director | SELL | $500K+ | 15K | $34.63 | Feb 22, 2024 |
| Erba Nancy | Director | SELL | $50K–$100K | 2K | $30.57 | Dec 1, 2023 |
| Zhang Shuo | Director | SELL | $100K–$500K | 3K | $33.75 | Aug 21, 2023 |
| Strojwas Andrzej | CTO | SELL | $50K–$100K | 3K | $38.45 | Mar 9, 2023 |
| Raza Adnan | EVP, FINANCE AND CFO | SELL | $500K+ | 16K | $37.64 | Mar 6, 2023 |
| GUSTAFSON MICHAEL B | Director | SELL | $100K–$500K | 13K | $37.26 | Mar 2, 2023 |
| BRONSON JOSEPH R | Director | SELL | $100K–$500K | 13K | $36.47 | Feb 24, 2023 |
| Strojwas Andrzej | CTO | SELL | $500K+ | 20K | $31.00 | Dec 2, 2022 |
| Raza Adnan | EVP, FINANCE AND CFO | SELL | $100K–$500K | 12K | $30.22 | Nov 29, 2022 |
| GUSTAFSON MICHAEL B | Director | SELL | $100K–$500K | 5K | $29.92 | Nov 17, 2022 |
| Zhang Shuo | Director | SELL | $50K–$100K | 2K | $29.84 | Nov 17, 2022 |
| Raza Adnan | EVP, FINANCE AND CFO | SELL | $500K+ | 39K | $20.22 | Jun 16, 2022 |
| Raza Adnan | EVP, FINANCE AND CFO | SELL | $100K–$500K | 6K | $21.88 | Jun 13, 2022 |
| Zhang Shuo | Director | SELL | $100K–$500K | 11K | $25.50 | Mar 17, 2022 |
| MICHAELS KIMON | EVP OF PRODUCTS AN… | SELL | N/A | 9K | — | Feb 25, 2022 |
| MICHAELS KIMON | EVP OF PRODUCTS AN… | EXERCISE | $100K–$500K | 15K | $8.79 | Feb 25, 2022 |
Institutional Ownership
13F filings as of Dec 31, 2025 · 152 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 1.4M | $1M+ | SH |
| Ranger Investment Management, L.P. | 1.2M | $1M+ | SH |
| STATE STREET CORP | 1.2M | $1M+ | SH |
| SNYDER CAPITAL MANAGEMENT L P | 955K | $1M+ | SH |
| EMERALD ADVISERS, LLC | 943K | $1M+ | SH |
| DIMENSIONAL FUND ADVISORS LP | 756K | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 665K | $1M+ | SH |
| Samjo Management, LLC | 612K | $1M+ | SH |
| EMERALD MUTUAL FUND ADVISERS TRUST | 595K | $1M+ | SH |
| Samjo Management, LLC | 539K | $1M+ | SH |
| WASATCH ADVISORS LP | 522K | $1M+ | SH |
| ArrowMark Colorado Holdings LLC | 493K | $1M+ | SH |
| Silverberg Bernstein Capital Management LLC | 474K | $1M+ | SH |
| LOOMIS SAYLES & CO L P | 428K | $1M+ | SH |
| Connor, Clark & Lunn Investment Management Ltd. | 388K | $1M+ | SH |
| Pillsbury Lake Capital LLC | 376K | $1M+ | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 307K | $1M+ | SH |
| HERALD INVESTMENT MANAGEMENT Ltd | 225K | $1M+ | SH |
| Roubaix Capital, LLC | 220K | $1M+ | SH |
| Squarepoint Ops LLC | 218K | $1M+ | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
SC 13G/A · Feb 17, 2026
6.5%
2.6M shares
NEEDHAM INVESTMENT MANAGEMENT L.L.C.
SC 13G/A · Feb 13, 2026
4.9%
2.0M shares
NEEDHAM INVESTMENT MANAGEMENT L.L.C.
SC 13G · Nov 13, 2025
5.1%
2.0M shares
SC 13G/A · Feb 12, 2025
6.5%
2.5M shares
The Vanguard Group - 23-1945930
SC 13G/A · Feb 13, 2024
8.1%
3.1M shares
SC 13G/A · Jan 23, 2024
12.7%
4.8M shares
SC 13G/A · Dec 11, 2023
1.9%
722K shares
SC 13G · Aug 7, 2023
0.0%
0 shares
SC 13G · Feb 3, 2023
4.0%
1.4M shares
SC 13G · Feb 3, 2023
4.0%
1.4M shares
SC 13G/A · Feb 2, 2023
8.7%
3.3M shares
SC 13G/A · Jan 23, 2023
12.4%
4.6M shares
T. ROWE PRICE ASSOCIATES, INC. 52-0556948
SC 13G/A · Feb 14, 2022
0.0%
2K shares
Cowen Prime Advisors, a division of Cowen Prime Services LLC
SC 13G · Feb 10, 2022
0.0%
0 shares
SC 13G/A · Feb 10, 2022
8.7%
3.3M shares
SC 13G/A · Jan 28, 2022
12.6%
4.7M shares