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Personalis PSNL

US equityMarket cap rank #2880
$16.40 +$0.12 (+0.74%)
Pre-market · Oct 6, 4:10 am ET · After hours $16.40 0.00%
Open$16.12
Prev close$16.28
Day range$16.02 – $16.47
Volume1.70M
Market cap$1.75B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership80.2%-1.70 pts vs. prior quarter
Institutions holding181-4 vs. prior quarter
Insider trades (recent)29 buys / 21 sellsNet buying
Short interest7.74% of floatDays to cover 3.6 · as of 15 Sep 2026
Short-sale volume share19.2%5-day average of daily volume

Short-sale volume as % of daily volume

11%16%21%26%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$29.70M (6 inflow days, 14 outflow days).

The five largest holders on file together own 38.0% of shares outstanding.

Largest holders

  • Tempus AI, Inc.12.21%
  • ARK Investment Management LLC7.74%
  • BlackRock6.63%
  • Lightspeed Management Company, LLC5.71%
  • Columbia Management Investment Advisers, LLC5.70%
  • Deep Track Capital, LP3.75%
  • abrdn plc3.51%
  • Vanguard Capital Management, LLC3.24%

By investor type

  • Mutual Fund42.71%
  • Public Company16.27%
  • VC/PE Fund11.88%
  • Hedge Fund5.83%
  • Private Company2.33%
  • Individual/Insider1.21%
  • Government Pension Fund0.61%
  • Insurance Company0.54%

Reported short interest has fallen from 10.80% to 7.74% 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 8,266,193 7.7% 3.6
31 Aug 2026 8,384,040 7.9% 1.8
14 Aug 2026 8,398,426 7.9% 3.6
31 Jul 2026 8,714,008 8.2% 1.7
15 Jul 2026 11,097,287 10.6% 2.3
30 Jun 2026 11,306,678 10.8% 2.8

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