PDF Solutions, Inc.
US ˙ NasdaqGS ˙ US6932821050

SecurityPDFS / PDF Solutions, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership352,559 shares
Latest Disclosed Value $ 11,532,206
Northern Trust Corp reports 1.33% increase in ownership of PDFS / PDF Solutions, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 352,559 shares of PDF Solutions, Inc. (US:PDFS) valued at $11,532,205 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 347,934 shares of PDF Solutions, Inc.. This represents a change in shares of 1.33% during the quarter. The current value of the position is $19,880,802 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.

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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)
2026-05-14 2026-03-31 13F PDF SOLUTIONS COM 693282105 352,559 4,625 1.33 11,532 16.18 0.0015
2026-02-17 2025-12-31 13F PDF SOLUTIONS COM 693282105 347,934 -15,855 -4.36 9,927 5.67 0.0013
2025-11-14 2025-09-30 13F PDF SOLUTIONS COM 693282105 363,789 -8,745 -2.35 9,393 17.94 0.0012
2025-08-13 2025-06-30 13F PDF SOLUTIONS COM 693282105 372,534 -21,410 -5.43 7,965 5.79 0.0011
2025-05-13 2025-03-31 13F PDF SOLUTIONS COM 693282105 393,944 -11,342 -2.80 7,528 -31.41 0.0011
2025-02-14 2024-12-31 13F PDF SOLUTIONS COM 693282105 405,286 32,890 8.83 10,975 -6.97 0.0016
2024-11-13 2024-09-30 13F PDF SOLUTIONS COM 693282105 372,396 -7,904 -2.08 11,798 -14.73 0.0019
2024-08-14 2024-06-30 13F PDF SOLUTIONS COM 693282105 380,300 -9,134 -2.35 13,835 5.51 0.0023
2024-05-14 2024-03-31 13F PDF SOLUTIONS COM 693282105 389,434 -6,640 -1.68 13,112 3.01 0.0023
2024-02-13 2023-12-31 13F PDF SOLUTIONS COM 693282105 396,074 -2,156 -0.54 12,730 -1.34 0.0023
2023-11-13 2023-09-30 13F PDF SOLUTIONS COM 693282105 398,230 -142 -0.04 12,903 -28.19 0.0025
2023-08-11 2023-06-30 13F PDF SOLUTIONS COM 693282105 398,372 10,709 2.76 17,967 9.31 0.0035
2023-05-15 2023-03-31 13F PDF SOLUTIONS COM 693282105 387,663 1,265 0.33 16,437 49.15 0.0033
2023-02-13 2022-12-31 13F PDF SOLUTIONS COM 693282105 386,398 3,737 0.98 11,020 17.40 0.0023
2022-11-14 2022-09-30 13F PDF SOLUTIONS COM 693282105 382,661 -3,586 -0.93 9,387 12.99 0.0021
2022-08-12 2022-06-30 13F PDF SOLUTIONS COM 693282105 386,247 22,708 6.25 8,308 -18.00 0.0018
2022-05-13 2022-03-31 13F PDF SOLUTIONS COM 693282105 363,539 -9,398 -2.52 10,132 -14.53 0.0018
2022-02-08 2021-12-31 13F PDF SOLUTIONS COM 693282105 372,937 -3,899 -1.03 11,855 36.55 0.0019
2021-11-15 2021-09-30 13F PDF SOLUTIONS COM 693282105 376,836 -7,690 -2.00 8,682 24.21 0.0015
2021-08-13 2021-06-30 13F PDF SOLUTIONS COM 693282105 384,526 -17,699 -4.40 6,990 -2.27 0.0012
2021-05-12 2021-03-31 13F PDF SOLUTIONS COM 693282105 402,225 -33,548 -7.70 7,152 -24.02 0.0013
2021-02-11 2020-12-31 13F PDF SOLUTIONS COM 693282105 435,773 -15,263 -3.38 9,413 11.54 0.0018
2020-11-16 2020-09-30 13F PDF SOLUTIONS COM 693282105 451,036 -14,280 -3.07 8,439 -7.27 0.0019
2020-08-14 2020-06-30 13F PDF SOLUTIONS COM 693282105 465,316 68,687 17.32 9,101 95.76 0.0022
2020-05-14 2020-03-31 13F PDF SOLUTIONS COM 693282105 396,629 -985 -0.25 4,649 -30.78 0.0013
2020-02-14 2019-12-31 13F PDF SOLUTIONS COM 693282105 397,614 -7,412 -1.83 6,716 26.86 0.0015
2019-11-13 2019-09-30 13F PDF SOLUTIONS COM 693282105 405,026 19,014 4.93 5,294 4.54 0.0013
2019-08-13 2019-06-30 13F PDF SOLUTIONS COM 693282105 386,012 13,664 3.67 5,064 10.11 0.0012
2019-05-13 2019-03-31 13F PDF SOLUTIONS COM 693282105 372,348 7,869 2.16 4,599 49.66 0.0011
2019-02-12 2018-12-31 13F PDF SOLUTIONS COM 693282105 364,479 -9,271 -2.48 3,073 -8.95 0.0009
2018-11-14 2018-09-30 13F PDF SOLUTIONS COM 693282105 373,750 4,003 1.08 3,375 -23.80 0.0008
2018-09-18 2018-06-30 13F/A-1 PDF SOLUTIONS COM 693282105 369,747 -10,463 -2.75 4,429 -0.11 0.0011
2018-08-14 2018-06-30 13F PDF SOLUTIONS COM 693282105 371,826 -8,384 4,454
2018-05-09 2018-03-31 13F PDF SOLUTIONS COM 693282105 380,210 12,983 3.54 4,434 -23.10 0.0012
2018-02-14 2017-12-31 13F PDF SOLUTIONS COM 693282105 367,227 -4,390 -1.18 5,766 0.16 0.0015
2017-11-13 2017-09-30 13F PDF SOLUTIONS COM 693282105 371,617 -3,946 -1.05 5,757 -6.81 0.0015
2017-08-11 2017-06-30 13F PDF SOLUTIONS COM 693282105 375,563 9,047 2.47 6,178 -25.49 0.0017
2017-05-12 2017-03-31 13F PDF SOLUTIONS COM 693282105 366,516 7,362 2.05 8,291 2.37 0.0024
2017-02-13 2016-12-31 13F PDF SOLUTIONS COM 693282105 359,154 -348,526 -49.25 8,099 -37.02 0.0025
2016-11-09 2016-09-30 13F PDF SOLUTIONS COM 693282105 707,680 -10,000 -1.39 12,859 28.06 0.0040
2016-08-12 2016-06-30 13F PDF SOLUTIONS COM 693282105 717,680 1,819 0.25 10,041 21.96 0.0033
2016-08-19 2016-03-31 13F/A-1 PDF SOLUTIONS COM 693282105 715,861 -118,782 -14.23 8,233 -9.00 0.0027
2016-05-13 2016-03-31 13F Pdf Solutions COMM 693282105 715,861 9,578
2016-02-12 2015-12-31 13F Pdf Solutions COMM 693282105 834,643 -20,635 -2.41 9,047 5.79 0.0030
2015-11-12 2015-09-30 13F Pdf Solutions COMM 693282105 855,278 855,278 2.47 8,552 -5.47 0.0029
2015-08-13 2015-06-30 13F Pdf Solutions COMM 693282105 0 -736,648 -100.00 0 -100.00
2015-05-14 2015-03-31 13F Pdf Solutions COMM 693282105 736,648 81,924 12.51 13,200 35.68 0.0040
2015-02-12 2014-12-31 13F Pdf Solutions COM 693282105 654,724 126,200 23.88 9,729 45.99 0.0029
2014-11-13 2014-09-30 13F Pdf Solutions COMM 693282105 528,524 210,276 66.07 6,664 -1.32 0.0021
2014-08-14 2014-06-30 13F PDF SOLUTIONS com 693282105 318,248 -132,406 -29.38 6,753 -17.53 0.0021
2014-05-14 2014-03-31 13F PDF SOLUTIONS COMM 693282105 450,654 81,704 22.15 8,188 -13.38 0.0026
2014-02-21 2013-12-31 13F/A-1 PDF SOLUTIONS COM 693282105 368,950 10,972 3.06 9,453 24.38 0.0030
2014-02-12 2013-12-31 13F PDF SOLUTIONS COM 693282105 368,950 9,453
2013-11-13 2013-09-30 13F PDF SOLUTIONS COM 693282105 357,978 4,130 1.17 7,600 16.53 0.0027
2013-08-09 2013-06-30 13F PDF SOLUTIONS COM 693282105 353,848 353,848 6,522 0.0024
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.