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BillionToOne BLLN

US equityMarket cap rank #2083
$109.06 +$3.16 (+2.98%)
Market closed · Oct 5, 10:20 pm ET · Last extended-hours $109.06 0.00%
Open$105.15
Prev close$105.90
Day range$104.42 – $110.09
Volume407.8K
Market cap$5.15B
P/E (TTM)153.8
Dividend yield–

Ownership & positioning

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

Institutional ownership64.2%-6.17 pts vs. prior quarter
Institutions holding185-1 vs. prior quarter
Insider trades (recent)7 buys / 43 sellsNet selling
Short interest5.56% of floatDays to cover 4.8 · as of 15 Sep 2026
Short-sale volume share14.5%5-day average of daily volume

Short-sale volume as % of daily volume

10%12%15%17%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$15.24M (5 inflow days, 15 outflow days).

The five largest holders on file together own 37.9% of shares outstanding.

Largest holders

  • Hummingbird Ventures Management NV16.71%
  • Libertus Capital Limited7.55%
  • Oguzhan Atay4.98%
  • David Tsao4.89%
  • Wipro Enterprises Private Limited3.78%
  • Adams Street Partners, LLC3.63%
  • NeoTribe Ventures2.45%
  • T. Rowe Price Group, Inc.2.34%

By investor type

  • VC/PE Fund30.63%
  • Mutual Fund25.55%
  • Individual/Insider10.56%
  • Private Company4.65%
  • Hedge Fund2.26%
  • Public Company0.54%
  • Government Pension Fund0.43%
  • Family Office/Trust0.10%

Reported short interest has risen from 5.27% to 5.56% 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 2,625,520 5.6% 4.8
31 Aug 2026 2,348,604 5.0% 4.2
14 Aug 2026 1,949,158 4.1% 1.8
31 Jul 2026 1,920,601 4.2% 3.4
15 Jul 2026 2,407,203 5.2% 3.6
30 Jun 2026 2,424,403 5.3% 3.0

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