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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 1 sale; 284 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.

Holders of 5% or more of PDFS
HolderLatest formStakeChangeFirst filedLatest filingFiling
Kibarian John Kachig13G/A6.50%2.56M shares0.00 ppfrom 6.50%Feb 16, 20216 filingsFeb 17, 2026SEC
Wasatch Advisors Inc13G6.30%2.65M sharesNewOct 9, 20261 filingOct 9, 2026SEC
Needham Investment Management LLC13G5.10%2.02M shares+0.20 ppfrom 4.90%Nov 13, 20253 filingsMay 14, 2026SEC

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

30 Schedule 13D and 13G filings on PDF Solutions Inc, newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on PDFS
Filed (ET)FilerFormStakeChangeEvent dateFiling
Oct 9, 20264:09 PM ETWasatch Advisors Inc13G6.30%2.65M sharesNewSep 30, 2026SEC
May 27, 20269:00 PM ETAdvantest Corpand 1 other13G/A0.00%0 shares–Below 5%May 15, 2026SEC
May 14, 20266:39 PM ETNeedham Investment Management LLCand 2 others13G5.10%2.02M shares+0.20 ppfrom 4.90%Mar 31, 2026SEC
Mar 27, 202611:22 AM ETVanguard Group Inc13G/A0.00%0 shares–Below 5%Mar 13, 2026SEC
Feb 17, 20263:55 PM ETKibarian John Kachig13G/A6.50%2.56M shares0.00 ppfrom 6.50%Dec 31, 2025SEC
Feb 13, 20265:48 PM ETNeedham Investment Management LLCand 5 others13G/A4.90%1.97M shares−0.20 ppfrom 5.10%Below 5%Dec 31, 2025SEC
Nov 13, 20255:48 PM ETNeedham Investment Management LLCand 5 others13G5.10%2.02M sharesNewSep 30, 2025SEC
Feb 12, 20256:54 PM ETKibarian John Kachig13G/A6.50%2.51M shares–Feb 12, 2025SEC
Feb 13, 2024Kibarian John Kachig13G/AOld format–––SEC
Feb 13, 2024Vanguard Group Inc13G/AOld format–––SEC
Jan 23, 20244:14 PM ETBlackRock Inc.13G/AOld format–––SEC
Dec 11, 2023Invesco Ltd.13G/AOld format–––SEC
Aug 7, 2023Cowen Prime Advisors LLC13GOld format–––SEC
Feb 14, 2023Kibarian John Kachig13G/AOld format–––SEC
Feb 9, 2023Vanguard Group Inc13G/AOld format–––SEC
Feb 3, 2023Cowen Prime Advisors LLC13GOld format–––SEC
Feb 2, 2023Invesco Ltd.13G/AOld format–––SEC
Jan 23, 20233:52 PM ETBlackRock Inc.13G/AOld format–––SEC
Feb 14, 2022Price T Rowe Associates Inc13G/AOld format–––SEC
Feb 11, 2022Kibarian John Kachig13G/AOld format–––SEC
Feb 10, 2022Vanguard Group Inc13G/AOld format–––SEC
Feb 10, 2022Invesco Ltd.13G/AOld format–––SEC
Feb 9, 2022Cowen Prime Advisors LLC13GOld format–New–SEC
Jan 28, 20221:54 PM ETBlackRock Inc.13G/AOld format–––SEC
Feb 16, 2021Kibarian John Kachig13G/AOld format–––SEC
Feb 16, 2021Dimensional Fund Advisors LP13G/AOld format–––SEC
Feb 16, 2021Price T Rowe Associates Inc13G/AOld format–––SEC
Feb 12, 2021Invesco Ltd.13G/AOld format–––SEC
Feb 10, 2021Vanguard Group Inc13G/AOld format–––SEC
Jan 26, 20216:52 PM ETBlackRock Inc.13G/AOld format–––SEC

Form 144: proposed insider sales

16 notices from officers, directors and other affiliates planning to sell PDF Solutions Inc shares, newest first.

Form 144 notices for PDFS
Filed (ET)SellerShares to sellMarket valuePlanned saleBrokerFiling
Nov 12, 20264:47 PM ETJoseph R BronsonDirector10.0K$408.2KNov 12, 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Aug 31, 20264:06 PM ETAndrzej StrojwasOfficer3.39K$150.7KAug 31, 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Aug 12, 20264:10 PM ETShuo ZhangDirector1.50K$77.3KAug 12, 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Dec 16, 20245:31 PM ETStrojwas AndrzejOfficer8.69K$268.0KDec 16, 2024Morgan Stanley Smith Barney LLC Executive ServicesSEC
Dec 11, 20244:25 PM ETNancy Erba Family Living TrustDirector2.00K$61.6KDec 11, 2024Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Nov 13, 20246:18 PM ETStrojwas AndrzejOfficer6.25K$209.4KNov 13, 2024Morgan Stanley Smith Barney LLC Executive ServicesSEC
Jun 3, 20245:27 PM ETZhang ShuoDirector5.50K$194.9KJun 3, 2024Morgan Stanley Smith Barney LLC Executive ServicesSEC
May 17, 20244:33 PM ETRaza AdnanOfficer9.65K$323.2KMay 17, 2024Morgan Stanley Smith Barney LLC Executive ServicesSEC
May 16, 20245:40 PM ETRaza AdnanOfficer6.16K$203.3KMay 16, 2024Morgan Stanley Smith Barney LLC Executive ServicesSEC
May 15, 20245:59 PM ETRaza AdnanOfficer11.7K$403.2KMay 15, 2024Morgan Stanley Smith Barney LLC Executive ServicesSEC
May 14, 20247:47 PM ETStrojwas AndrzejOfficer6.25K$230.1KMay 14, 2024Morgan Stanley Smith Barney LLC Executive ServicesSEC
Feb 23, 20244:31 PM ETLi Revocable TrustDirector11.2K$385.8KFeb 23, 2024UBS Financial Services IncSEC
Feb 21, 20244:28 PM ETBronson Joseph RDirector15.0K$509.7KFeb 21, 2024Morgan Stanley Smith Barney LLC Executive ServicesSEC
Dec 12, 20236:21 PM ETGustafson Michael BOfficer5.75K$179.8KDec 12, 2023Morgan Stanley Smith Barney LLC Executive ServicesSEC
Nov 29, 20234:41 PM ETNancy Erba Ttee Nancy Erba Family Living TrustDirector1.80K$55.0KNov 29, 2023Morgan Stanley Smith Barney LLC Executive Financial ServicesSEC
Aug 18, 20234:39 PM ETZhang ShuoDirector3.05K$102.8KAug 18, 2023ETRADE FINANCIAL CORPORATIONSEC