PDFS · Insider trading · 13F holders · Congress trades
PDF Solutions Inc (PDFS)
Who is buying and selling PDFS: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 24
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $228K
- Congress trades, 12 months
- 0
PDFS at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 2 PDFS insiders filed 2 sales worth $228K on SEC Form 4, and no open-market purchases.
- 24 13F filers hold PDFS among their 50 largest positions, worth $808.3M combined, including Spencer Waxman and Gavin Baker. The biggest bets by portfolio weight are Samjo Management, LLC (13.2%), Silverberg Bernstein Capital Management LLC (10.7%) and Ranger Investment Management, L.P. (5.1%). In their latest 13Fs, 1 manager opened a new position and 3 added to one.
- No member of Congress has disclosed a trade in PDFS.
- PDFS last closed at $45.56 on Oct 29, 2026.
PDFS insider trading
Between Aug 1, 2026 and Oct 29, 2026, 2 PDFS insiders filed 2 sales worth $228K on SEC Form 4, and no open-market purchases.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Sep 1, 2026 | Strojwas Andrzej | Chief Technology Officer | Sale | 3,394 | $44.41 | $151K | SEC |
| Aug 12, 2026 | Zhang Shuo | Director | Sale | 1,501 | $51.47 | $77K | SEC |
Who owns PDFS? Hedge funds and superinvestors
24 13F filers hold PDFS among their 50 largest positions, worth $808.3M combined, including Spencer Waxman and Gavin Baker. The biggest bets by portfolio weight are Samjo Management, LLC (13.2%), Silverberg Bernstein Capital Management LLC (10.7%) and Ranger Investment Management, L.P. (5.1%). In their latest 13Fs, 1 manager opened a new position and 3 added to one.
Superinvestors holding PDFS: Spencer Waxman 2.3% · Gavin Baker 0.4%
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Needham Investment Management LLCMutual fund manager | 4.4% | $146.2M | 2,065,000 | +2.1% shares | Q2 2026 |
| Wasatch Advisors LPAsset manager | 1.0% | $135.1M | 2,646,572 | — | Q3 2026 |
| Ranger Investment Management, L.P.Institutional asset manager | 5.1% | $81.4M | 1,149,647 | -10.2% shares | Q2 2026 |
| Snyder Capital Management L PHedge fund | 1.3% | $73.2M | 1,033,997 | — | Q2 2026 |
| Emerald Advisers, LLCInstitutional asset manager | 1.5% | $62.6M | 884,294 | +2.7% shares | Q2 2026 |
| Gavin BakerHedge fund | 0.4% | $46.6M | 658,536 | — | Q2 2026 |
| Ophir Asset Management Pty LtdAsset manager | 3.5% | $43.0M | 607,343 | -46.6% shares | Q2 2026 |
| Emerald Mutual Fund Advisers TrustMutual fund manager | 1.4% | $40.1M | 566,429 | -4.7% shares | Q2 2026 |
| Samjo Management, LLCHedge fund | 13.2% | $38.8M | 548,285 | -40.4% shares | Q2 2026 |
| Spencer WaxmanHedge fund | 2.3% | $26.2M | 369,776 | New | Q2 2026 |
| Silverberg Bernstein Capital Management LLCWealth manager | 10.7% | $22.6M | 441,964 | -5.1% shares | Q3 2026 |
| Divisar Capital Management LLCHedge fund | 5.0% | $21.8M | 307,879 | -50.6% shares | Q2 2026 |
| ArrowMark Colorado Holdings LLCHedge fund | 0.8% | $19.4M | 274,537 | — | Q2 2026 |
| HERALD INVESTMENT MANAGEMENT LtdAsset manager | 1.1% | $8.5M | 119,667 | -40.2% shares | Q2 2026 |
| Pillsbury Lake Capital LLCHedge fund | 2.3% | $8.3M | 117,854 | -56.5% shares | Q2 2026 |
| Brown Capital Management LLCMutual fund manager | 1.5% | $7.9M | 154,211 | +50.8% shares | Q3 2026 |
| Gem Investment Advisors, LLCHedge fund | 4.6% | $7.5M | 105,526 | +0.0% shares | Q2 2026 |
| Bridge City Capital, LLCInstitutional asset manager | 1.0% | $4.6M | 90,923 | +18.8% shares | Q3 2026 |
| Roubaix Capital, LLCHedge fund | 1.4% | $3.8M | 53,546 | -70.6% shares | Q2 2026 |
| Bouvel Investment Partners, LLCWealth manager | 0.7% | $3.2M | 63,271 | -0.1% shares | Q3 2026 |
| Riverwater Partners LLCWealth manager | 0.9% | $3.2M | 44,866 | — | Q2 2026 |
| Crown Advisors Management, Inc.Hedge fund | 1.6% | $2.8M | 40,000 | +60.0% shares | Q2 2026 |
| Kings Path Partners LLCInstitutional asset manager | 0.2% | $909K | 17,800 | -9.4% shares | Q3 2026 |
| Significant Wealth Partners LLCWealth manager | 0.7% | $634K | 8,949 | — | Q2 2026 |
Each manager counts with its latest 13F (Q3 2026: 6, Q2 2026: 18). Screen PDFS in the grand portfolio →
PDFS stock trades by members of Congress
No member of Congress has disclosed a trade in PDFS.
Analysis mentioning PDFS
Posts from the blog that cover PDF Solutions Inc, newest first.
PDFS questions and answers
Are insiders buying PDFS stock?
Between Aug 1, 2026 and Oct 29, 2026, 2 PDFS insiders filed 2 sales worth $228K on SEC Form 4, and no open-market purchases.
Which hedge funds own PDFS?
24 13F filers hold PDFS among their 50 largest positions, worth $808.3M combined, including Spencer Waxman and Gavin Baker. The biggest bets by portfolio weight are Samjo Management, LLC (13.2%), Silverberg Bernstein Capital Management LLC (10.7%) and Ranger Investment Management, L.P. (5.1%). In their latest 13Fs, 1 manager opened a new position and 3 added to one.
Has Congress traded PDFS?
No member of Congress has disclosed a trade in PDFS.
Who is the largest holder of PDFS?
Among 13F filers, Needham Investment Management LLC reports the largest PDFS position, $146.2M (2,065,000 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Samjo Management, LLC's: 13.2% of its portfolio.
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