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PDF Solutions PDFS

US equityMarket cap rank #2666Software - Application
$56.08 +$0.58 (+1.05%)
Pre-market · Oct 6, 8:10 am ET · After hours $56.08 0.00%
Open$55.71
Prev close$55.50
Day range$55.22 – $56.67
Volume535.3K
Market cap$2.37B
P/E (TTM)224.3
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership100.8%-1.56 pts vs. prior quarter
Institutions holding322-4 vs. prior quarter
Insider trades (recent)27 buys / 23 sellsNet buying
Short interest7.69% of floatDays to cover 5.7 · as of 15 Sep 2026
Short-sale volume share22.0%5-day average of daily volume

Short-sale volume as % of daily volume

17%21%25%30%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$3.63M (10 inflow days, 10 outflow days).

The five largest holders on file together own 36.5% of shares outstanding.

Largest holders

  • BlackRock13.14%
  • Advantest Corporation7.83%
  • John Kibarian6.07%
  • Needham Investment Management, LLC4.89%
  • Vanguard Capital Management, LLC4.57%
  • Kimon Michaels3.72%
  • Vanguard Portfolio Management, LLC3.45%
  • Emerald Advisers, LLC3.44%

By investor type

  • Mutual Fund81.66%
  • Individual/Insider10.49%
  • Public Company9.86%
  • Hedge Fund6.35%
  • Private Company1.31%
  • Government Pension Fund1.14%
  • Family Office/Trust0.23%
  • Insurance Company0.13%

Reported short interest has risen from 5.26% to 7.69% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 3,248,816 7.7% 5.7
31 Aug 2026 3,066,316 7.3% 4.4
14 Aug 2026 2,435,684 5.8% 4.9
31 Jul 2026 2,377,838 5.8% 4.6
15 Jul 2026 2,583,493 6.3% 3.9
30 Jun 2026 2,166,315 5.3% 2.6

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