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IDEAYA Biosciences IDYA

US equityMarket cap rank #2335
$38.06 +$0.70 (+1.87%)
Pre-market · Oct 6, 4:40 am ET · After hours $38.06 0.00%
Open$37.57
Prev close$37.36
Day range$37.04 – $38.26
Volume658.0K
Market cap$3.67B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership107.2%-0.11 pts vs. prior quarter
Institutions holding342-1 vs. prior quarter
Insider trades (recent)43 buys / 5 sellsNet buying
Short interest10.29% of floatDays to cover 17.3 · as of 15 Sep 2026
Short-sale volume share25.0%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: −$3.72M (7 inflow days, 13 outflow days).

The five largest holders on file together own 43.5% of shares outstanding.

Largest holders

  • FMR14.62%
  • BlackRock9.22%
  • Janus Henderson Group plc8.89%
  • Capital Research5.54%
  • Baker Bros. Advisors LP5.19%
  • Vanguard Capital Management, LLC4.93%
  • State Street Global Advisors4.71%
  • Logos Global Management, L.P.3.11%

By investor type

  • Mutual Fund79.21%
  • Hedge Fund19.82%
  • Public Company3.87%
  • VC/PE Fund2.41%
  • Individual/Insider0.88%
  • Government Pension Fund0.87%
  • Insurance Company0.49%
  • Private Company0.40%

Reported short interest has fallen from 10.73% to 10.29% 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 9,931,622 10.3% 17.3
31 Aug 2026 10,103,757 10.5% 12.2
14 Aug 2026 10,398,078 10.8% 16.5
31 Jul 2026 10,113,206 10.5% 13.2
15 Jul 2026 9,573,580 9.9% 8.6
30 Jun 2026 10,334,969 10.7% 6.1

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