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NewAmsterdam Pharma NAMS

US equityMarket cap rank #2565Biotechnology
$22.80 −$0.40 (-1.72%)
Pre-market · Oct 6, 8:40 am ET · After hours $22.80 0.00%
Open$22.84
Prev close$23.20
Day range$22.23 – $23.34
Volume1.18M
Market cap$2.73B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership105.8%-1.22 pts vs. prior quarter
Institutions holding246-6 vs. prior quarter
Insider trades (recent)24 buys / 26 sellsNet selling
Short interest13.10% of floatDays to cover 9.9 · as of 15 Sep 2026
Short-sale volume share19.9%5-day average of daily volume

Short-sale volume as % of daily volume

11%18%25%32%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$38.53M (8 inflow days, 12 outflow days).

The five largest holders on file together own 51.3% of shares outstanding.

Largest holders

  • Frazier Life Sciences Management, LP15.84%
  • Capital Research11.67%
  • FMR8.65%
  • RA Capital Management, L.P.7.99%
  • Forbion Capital Partners B.V.7.10%
  • Deerfield Management Company, L.P.3.57%
  • Viking Global Investors LP3.52%
  • Bain Capital Life Sciences Investors, LLC3.18%

By investor type

  • Mutual Fund44.05%
  • VC/PE Fund36.55%
  • Hedge Fund17.17%
  • Family Office/Trust2.58%
  • Public Company2.51%
  • Private Company2.10%
  • Individual/Insider0.89%
  • Sovereign Wealth Fund0.70%

Reported short interest has risen from 7.78% to 13.10% 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 15,660,444 13.1% 9.9
31 Aug 2026 13,392,021 11.2% 13.4
14 Aug 2026 12,654,106 10.6% 9.9
31 Jul 2026 9,959,761 8.5% 9.8
15 Jul 2026 9,176,420 7.8% 11.2
30 Jun 2026 9,091,198 7.8% 6.9

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