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Sellas Life Sciences SLS

US equityMarket cap rank #2670
$11.63 −$0.11 (-0.94%)
Pre-market · Oct 6, 5:50 am ET · After hours $11.65 +0.17%
Open$11.77
Prev close$11.74
Day range$11.35 – $11.77
Volume4.51M
Market cap$2.35B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership36.7%-0.57 pts vs. prior quarter
Institutions holding222+5 vs. prior quarter
Insider trades (recent)41 buys / 6 sellsNet buying
Short interest29.25% of floatDays to cover 8.6 · as of 15 Sep 2026
Short-sale volume share24.2%5-day average of daily volume

Short-sale volume as % of daily volume

17%22%26%30%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$25.37M (4 inflow days, 16 outflow days).

The five largest holders on file together own 23.3% of shares outstanding.

Largest holders

  • BlackRock7.46%
  • State Street Global Advisors6.44%
  • Vanguard Capital Management, LLC4.73%
  • Geode Capital Management, LLC2.42%
  • Anson Group2.23%
  • Edward Jones Trust Company1.14%
  • Vanguard Portfolio Management, LLC1.07%
  • Susquehanna International Group, LLP1.02%

By investor type

  • Mutual Fund29.67%
  • Hedge Fund2.66%
  • Private Company2.15%
  • Public Company1.71%
  • Individual/Insider0.39%
  • Government Pension Fund0.29%
  • Family Office/Trust0.20%
  • Sovereign Wealth Fund0.01%

Reported short interest has fallen from 32.20% to 29.25% 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 59,068,630 29.2% 8.6
31 Aug 2026 57,926,912 28.7% 6.9
14 Aug 2026 56,371,865 27.9% 10.4
31 Jul 2026 54,975,815 28.0% 7.9
15 Jul 2026 55,280,869 28.1% 5.9
30 Jun 2026 63,307,462 32.2% 4.8

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