PDF Solutions, Inc.
US ˙ NasdaqGS ˙ US6932821050

SecurityPDFS / PDF Solutions, Inc.
InstitutionRoubaix Capital, LLC
Latest Disclosed Ownership181,937 shares
Latest Disclosed Value $ 5,951,159
Roubaix Capital, LLC reports 17.31% decrease in ownership of PDFS / PDF Solutions, Inc.

On May 6, 2026 - Roubaix Capital, LLC filed a 13F-HR form disclosing ownership of 181,937 shares of PDF Solutions, Inc. (US:PDFS) valued at $5,951,159 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 220,022 shares of PDF Solutions, Inc.. This represents a change in shares of -17.31% during the quarter. The current value of the position is $10,259,427 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

Upgrade to unlock premium data and export to Excel .

Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-06 2026-03-31 13F PDF SOLUTIONS COM 693282105 181,937 -38,085 -17.31 5,951 -5.19 2.7773
2026-02-09 2025-12-31 13F PDF SOLUTIONS COM 693282105 220,022 13,674 6.63 6,277 17.83 2.6765
2025-11-12 2025-09-30 13F PDF SOLUTIONS COM 693282105 206,348 206,348 5,328 2.4811
2024-10-25 2024-09-30 13F PDF SOLUTIONS COM 693282105 0 -101,983 -100.00 0 -100.00
2024-08-02 2024-06-30 13F PDF SOLUTIONS COM 693282105 101,983 3,865 3.94 3,710 12.32 2.3436
2024-08-01 2024-03-31 13F/A-1 PDF SOLUTIONS COM 693282105 98,118 51,812 111.89 3,304 121.98 2.0889
2024-05-13 2024-03-31 13F PDF SOLUTIONS COM 693282105 98,118 51,812 3,304 2.0889
2024-08-01 2023-12-31 13F/A-1 PDF SOLUTIONS COM 693282105 46,306 46,306 1,488 1.0429
2024-02-08 2023-12-31 13F PDF SOLUTIONS COM 693282105 46,306 46,306 1,488 1.0429
2023-07-26 2023-06-30 13F PDF SOLUTIONS COM 693282105 0 -87,915 -100.00 0 -100.00
2023-05-09 2023-03-31 13F PDF SOLUTIONS COM 693282105 87,915 -21,123 -19.37 3,728 19.88 2.8425
2023-02-06 2022-12-31 13F PDF SOLUTIONS COM 693282105 109,038 109,038 3,110 2.5174
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.