PDF Solutions Inc
PDFS- Exchange
- Nasdaq
- Industry
- Services-Prepackaged Software
- SEC CIK
- 0001120914
In the last 90 days, PDF Solutions Inc insiders filed 0 open-market purchases and 2 sales; 283 institutions reported holding it in 13F filings for Q2 2026, worth $2.75B in total; no superinvestor holds it.
Holders of 5% or more of PDFS
Holders whose latest Schedule 13D or 13G filing reports 5% or more of PDF Solutions Inc, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Kibarian John Kachig | 13G/A | 6.50%2.56M shares | 0.00 ppfrom 6.50% | Feb 12, 20252 filings | Feb 17, 2026 | SEC |
| Needham Investment Management LLC | 13G | 5.10%2.02M shares | +0.20 ppfrom 4.90% | Nov 13, 20253 filings | May 14, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
7 Schedule 13D and 13G filings on PDF Solutions Inc, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| May 27, 20269:00 PM ET | Advantest Corpand 1 other | 13G/A | 0.00%0 shares | –Below 5% | May 15, 2026 | SEC |
| May 14, 20266:39 PM ET | Needham Investment Management LLCand 2 others | 13G | 5.10%2.02M shares | +0.20 ppfrom 4.90% | Mar 31, 2026 | SEC |
| Mar 27, 202611:22 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2026 | SEC |
| Feb 17, 20263:55 PM ET | Kibarian John Kachig | 13G/A | 6.50%2.56M shares | 0.00 ppfrom 6.50% | Dec 31, 2025 | SEC |
| Feb 13, 20265:48 PM ET | Needham Investment Management LLCand 5 others | 13G/A | 4.90%1.97M shares | −0.20 ppfrom 5.10%Below 5% | Dec 31, 2025 | SEC |
| Nov 13, 20255:48 PM ET | Needham Investment Management LLCand 5 others | 13G | 5.10%2.02M shares | New | Sep 30, 2025 | SEC |
| Feb 12, 20256:54 PM ET | Kibarian John Kachig | 13G/A | 6.50%2.51M shares | – | Feb 12, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell PDF Solutions Inc shares.
No Form 144 notices for PDF Solutions Inc are on file.