Comparable stake leader
John Kachig Kibarian
SEC ownership of PDF SOLUTIONS INC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001120914.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- PDFS on Nasdaq
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
John Kachig Kibarian
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
John Kachig Kibarian
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001120914
- Issuer location
- Santa Clara, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of PDF SOLUTIONS INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
John Kachig Kibarian
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
13D/G
3/4/5
13F
Lead comparable stake: 6.5%
13D/G row: John Kachig Kibarian
Showing 1-8 of 50 holder rows.
Quick read
John Kachig Kibarian leads the comparable SEC ownership view at 6.5%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens John Kachig Kibarian's linked filing trail.
Comparable ownership
Top 5
John Kachig Kibarian
6.5%
NEEDHAM INVESTMENT MANAGEMENT LLC
5.1%
Kimon Michaels
4%
Adnan Raza
0.24%
Andrzej Strojwas
0.22%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| John Kachig Kibarian |
13D/G
3/4/5
KIBARIAN JOHN KACHIG · PRESIDENT AND CEO, Director
|
6.5%
|
$80,871,679
2,562,474 shares
|
+$1,578,000 | 31 Dec 2025 |
| NEEDHAM INVESTMENT MANAGEMENT LLC |
13D/G
13F
Needham Investment Management L.L.C. · Company
|
5.1%
|
$78,541,441
2,022,700 shares
|
+$2,240,491 | 31 Mar 2026 |
| Kimon Michaels |
3/4/5
EVP of Products and Solutions, Director
|
4%
|
$43,703,396
1,570,370 shares
|
— | 09 Dec 2025 |
| Adnan Raza |
3/4/5
EVP, Finance and CFO
|
0.24%
|
$2,652,806
93,383 shares
|
— | 01 Jan 2026 |
| Andrzej Strojwas |
3/4/5
Chief Technology Officer
|
0.22%
|
$2,544,990
89,204 shares
|
— | 01 Jan 2026 |
| Nancy Erba |
3/4/5
Director
|
0.1%
|
$791,597
41,122 shares
|
— | 01 Jul 2025 |
| Joseph R. Bronson |
3/4/5
Director
|
0.1%
|
$736,639
38,267 shares
|
— | 01 Jul 2025 |
| Michael B. Gustafson |
3/4/5
Director
|
0.09%
|
$721,932
37,503 shares
|
— | 01 Jul 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 25 Jun 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-11 of 11 reporting-owner rows connected to PDF SOLUTIONS INC. Open a relationship link for the CIK-to-CIK filing trail.
Rows
11
Largest Forms 3/4/5 holder
John Kachig Kibarian
Net 12M change
$0
Latest report
01 Jan 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| John Kachig Kibarian | PRESIDENT AND CEO, Director | $56,656,300 | Mixed | 24 Feb 2025 | ||
| Kimon Michaels | EVP of Products and Solutions, Director | $43,703,396 | Mixed | 09 Dec 2025 | ||
| Adnan Raza | EVP, Finance and CFO | $2,652,806 | Mixed | 01 Jan 2026 | ||
| Andrzej Strojwas | Chief Technology Officer | $2,544,990 | Mixed | 01 Jan 2026 | ||
| Marco Iansiti | Director | $1,268,405 | Mixed | 01 Jul 2022 | ||
| Nancy Erba | Director | $791,597 | Mixed | 01 Jul 2025 | ||
| Joseph R. Bronson | Director | $736,639 | Mixed | 01 Jul 2025 | ||
| Michael B. Gustafson | Director | $721,932 | Mixed | 01 Jul 2025 | ||
| Ye Jane Li | Director | $460,902 | Mixed | 01 Jul 2025 | ||
| Shuo Zhang | Director | $427,196 | Mixed | 01 Jul 2025 | ||
| Chi-Foon Chan | Director | $413,470 | Mixed | 01 Jul 2025 |
Recent insider transactions for PDF SOLUTIONS INC
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Andrzej Strojwas | PDFS | Common Stock | Tax liability | -3% | -2,762 | 89,204 | 01 Jan 2026 | Direct | ||
| Adnan Raza | PDFS | Common Stock | Tax liability | -7.19% | -5,498 | 71,010 | 01 Jan 2026 | Direct | ||
| Kimon Michaels | PDFS | Common Stock | Gift | -0.33% | -5,070 | 1,542,072 | 09 Dec 2025 | By Trust | ||
| Adnan Raza | PDFS | Common Stock | Award | 84.3% | 35,000 | 76,508 | 01 Aug 2025 | Direct | ||
| Andrzej Strojwas | PDFS | Common Stock | Award | 9.53% | 8,000 | 91,966 | 01 Aug 2025 | Direct | ||
| Kimon Michaels | PDFS | Common Stock | Tax liability | -2.74% | -798 | 28,298 | 01 Jul 2025 | By Spouse | ||
| Adnan Raza | PDFS | Common Stock | Tax liability | -7.15% | -4,921 | 63,880 | 01 Jul 2025 | Direct | ||
| Andrzej Strojwas | PDFS | Common Stock | Tax liability | -2.9% | -2,497 | 83,613 | 01 Jul 2025 | Direct | ||
| Joseph R. Bronson | PDFS | Common Stock | Award | 24.1% | 7,429 | 38,267 | 01 Jul 2025 | Direct | ||
| Chi-Foon Chan | PDFS | Common Stock | Award | 52.9% | 7,429 | 21,479 | 01 Jul 2025 | Direct | ||
| Nancy Erba | PDFS | Common Stock | Award | 37.2% | 7,429 | 27,383 | 01 Jul 2025 | Direct | ||
| Michael B. Gustafson | PDFS | Common Stock | Award | 24.7% | 7,429 | 37,503 | 01 Jul 2025 | Direct | ||
| Ye Jane Li | PDFS | Common Stock | Award | 45% | 7,429 | 23,943 | 01 Jul 2025 | Direct | ||
| Shuo Zhang | PDFS | Common Stock | Award | 50.3% | 7,429 | 22,192 | 01 Jul 2025 | Direct |
* marks a reported price that did not pass the local price check.