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Ultragenyx Pharmaceutical RARE

US equityMarket cap rank #3005
$14.50 −$0.72 (-4.73%)
Pre-market · Oct 6, 5:30 am ET · After hours $14.70 +1.38%
Open$15.25
Prev close$15.22
Day range$14.21 – $15.31
Volume4.66M
Market cap$1.43B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership110.5%+0.14 pts vs. prior quarter
Institutions holding385+0 vs. prior quarter
Insider trades (recent)30 buys / 20 sellsNet buying
Short interest16.81% of floatDays to cover 2.2 · as of 15 Sep 2026
Short-sale volume share20.3%5-day average of daily volume

Short-sale volume as % of daily volume

9%17%24%31%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$1.84M (8 inflow days, 12 outflow days).

The five largest holders on file together own 38.6% of shares outstanding.

Largest holders

  • BlackRock10.84%
  • RTW Investments, LP7.93%
  • Vanguard Portfolio Management, LLC6.91%
  • AQR Capital Management6.65%
  • State Street Global Advisors6.27%
  • Vanguard Capital Management, LLC5.05%
  • Two Sigma Investments, LP3.68%
  • Sands Capital Management, LLC3.21%

By investor type

  • Mutual Fund66.69%
  • Hedge Fund32.34%
  • Public Company4.63%
  • VC/PE Fund4.16%
  • Individual/Insider3.60%
  • Private Company1.56%
  • Insurance Company0.46%
  • Government Pension Fund0.34%

Reported short interest has risen from 16.47% to 16.81% 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 16,571,956 16.8% 2.2
31 Aug 2026 17,144,354 17.4% 8.0
14 Aug 2026 15,887,767 16.1% 7.8
31 Jul 2026 14,963,396 15.2% 8.3
15 Jul 2026 13,435,087 13.6% 6.9
30 Jun 2026 16,217,153 16.5% 3.6

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