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Proto Labs PRLB

US equityMarket cap rank #2667Metal Fabrication3D Printing
$98.68 +$0.47 (+0.48%)
Pre-market · Oct 6, 6:00 am ET · After hours $98.00 -0.69%
Open$98.04
Prev close$98.21
Day range$96.29 – $99.37
Volume258.7K
Market cap$2.36B
P/E (TTM)78.3
Dividend yield–

Ownership & positioning

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

Institutional ownership95.4%+0.29 pts vs. prior quarter
Institutions holding333+1 vs. prior quarter
Insider trades (recent)22 buys / 28 sellsNet selling
Short interest3.15% of floatDays to cover 4.8 · as of 15 Sep 2026
Short-sale volume share22.4%5-day average of daily volume

Short-sale volume as % of daily volume

12%19%26%34%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$1.15M (12 inflow days, 8 outflow days).

The five largest holders on file together own 42.8% of shares outstanding.

Largest holders

  • BlackRock16.29%
  • Disciplined Growth Investors, Inc.9.95%
  • Vanguard Portfolio Management, LLC6.69%
  • Vanguard Capital Management, LLC5.07%
  • Dimensional Fund Advisors4.82%
  • State Street Global Advisors4.76%
  • American Capital Management, Inc.2.59%
  • Geode Capital Management, LLC2.57%

By investor type

  • Mutual Fund82.12%
  • Hedge Fund7.32%
  • Public Company2.25%
  • Private Company1.21%
  • Government Pension Fund1.16%
  • Individual/Insider1.10%
  • Insurance Company0.90%
  • Bank/Investment Bank0.25%

Reported short interest has risen from 2.86% to 3.15% 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 753,948 3.2% 4.8
31 Aug 2026 615,345 2.6% 3.5
14 Aug 2026 656,363 2.7% 3.0
31 Jul 2026 675,490 2.8% 4.1
15 Jul 2026 676,418 2.8% 2.8
30 Jun 2026 679,916 2.9% 2.2

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