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Adaptive Biotechnologies ADPT

US equityMarket cap rank #2143
$29.84 +$1.49 (+5.26%)
Market closed · Oct 5, 10:20 pm ET · Last extended-hours $30.00 +0.54%
Open$28.57
Prev close$28.35
Day range$28.16 – $29.86
Volume1.43M
Market cap$4.76B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership99.4%-0.01 pts vs. prior quarter
Institutions holding363-2 vs. prior quarter
Insider trades (recent)0 buys / 50 sellsNet selling
Short interest8.45% of floatDays to cover 7.9 · as of 15 Sep 2026
Short-sale volume share17.2%5-day average of daily volume

Short-sale volume as % of daily volume

5%12%19%25%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$19.94M (7 inflow days, 13 outflow days).

The five largest holders on file together own 40.0% of shares outstanding.

Largest holders

  • Viking Global Investors LP18.79%
  • BlackRock9.49%
  • Vanguard Capital Management, LLC4.60%
  • Wellington Management Group3.70%
  • Vanguard Portfolio Management, LLC3.43%
  • D. E. Shaw & Co., L.P.2.90%
  • T. Rowe Price Group, Inc.2.79%
  • Westfield Capital Management Company, L.P.2.67%

By investor type

  • Mutual Fund66.82%
  • Hedge Fund26.20%
  • Individual/Insider2.58%
  • Private Company2.34%
  • Public Company1.94%
  • Insurance Company0.82%
  • VC/PE Fund0.76%
  • Government Pension Fund0.32%

Reported short interest has risen from 7.09% to 8.45% 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 13,489,581 8.5% 7.9
31 Aug 2026 11,712,796 7.3% 6.4
14 Aug 2026 13,323,767 8.3% 5.7
31 Jul 2026 12,490,395 7.9% 4.4
15 Jul 2026 11,396,387 7.1% 4.3
30 Jun 2026 11,352,839 7.1% 2.2

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