SELLAS Life Sciences Group, Inc.

SLS • NASDAQ

SELLAS Life Sciences Group, Inc. is a biotechnology company in the healthcare sector on NASDAQ, led by Angelos M. Stergiou, with a market cap of $289.2M. As of Q3 2025, 26% of shares are held by 91 institutional investors, with VANGUARD GROUP INC as the largest holder at 5.47%.

President, Chief Executive Officer, Vice Chairman and DirectorAngelos M. Stergiou

Market Cap$289.2M

Biotechnology

Healthcare

Employees17.0

Websitesellaslifesciences.com

Country

United States of America

Overview

Overview of institutional ownership in SLS as of Q3 2025 with a market cap of $201.2M

All Institutions

Institutions: 91
Value Held: $53.0M
Shares Held: 32.9M
Avg Position: $582.4K
Median Position: $43.6K

Hedge Funds

Hedge Funds: 7
Value Held: $2.5M
Shares Held: 1.5M
Avg Position: $351.0K
Median Position: $312.9K

Ownership Breakdown

Institutional (non-HF)

25.12%

$50.5M

Hedge Funds

1.22%

$2.5M

Retail & Other

73.66%

$148.2M

Based on market cap of $201.2M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in SLS as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
VANGUARD GROUP INC Institution	Salim Ramji CEO	$11.0M 0.00% of portfolio	5.47% 6.8M shares	≤ Q2 2013 Held for 12y 5m+	$6.69T
Frigate Ventures LP RIA/Wealth	Anthony Lawrence Moore CFO	$9.7M 1.17% of portfolio	4.83% 6.0M shares	Q1 2024 Held for 1y 8m	$827.1M
B BlackRock, Inc. Institution	-	$9.2M 0.00% of portfolio	4.55% 5.7M shares	≤ Q2 2013 Held for 12y 5m+	$5.67T
Marshall Wace LLP Institution	Diana Lj Harrison President	$3.8M 0.00% of portfolio	1.89% 2.4M shares	Q1 2025 Held for 8 months	$90.3B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$3.6M 0.00% of portfolio	1.81% 2.3M shares	Q4 2018 Held for 6y 11m	$1.57T
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$2.2M 0.00% of portfolio	1.09% 1.4M shares	Q2 2021 Held for 4y 5m	$2.88T
MORGAN STANLEY RIA/Wealth	Jed Finn CEO	$1.7M 0.00% of portfolio	0.84% 1.1M shares	≤ Q2 2013 Held for 12y 5m+	$1.65T
N Nuveen, LLC Institution	-	$1.6M 0.00% of portfolio	0.80% 997.9K shares	Q2 2025 Held for 5 months	$377.89B
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	-	$1.4M 0.00% of portfolio	0.69% 863.6K shares	Q2 2020 Held for 5y 5m	$67.9B
NORTHERN TRUST CORP Institution	Michael G. O'Grady CEO	$1.2M 0.00% of portfolio	0.59% 731.2K shares	Q4 2020 Held for 4y 11m	$782.01B

Net Capital Flow

Institutional buying and selling activity for SLS in Q3 2025

Traded: +$10.6M
Buyers: 51
Sellers: 23
Total Bought: +$14.5M
Total Sold: −$3.9M
Avg Position: $546.4K

Biggest Buyers

Institution	Net Bought	Current Position
Frigate Ventures LP RIA/Wealth	+$9.3M +5.8M shares	$9.7M 6.0M shares
B BlackRock, Inc. Institution	+$1.8M +1.1M shares	$9.2M 5.7M shares
Everhart Financial Group, Inc. RIA/Wealth	+$533.2K +331.2K shares	$533.2K 331.2K shares
RENAISSANCE TECHNOLOGIES LLC Hedge Fund•Quant	+$469.8K +291.8K shares	$469.8K 291.8K shares
STATE STREET CORP Institution	+$399.6K +248.2K shares	$2.2M 1.4M shares
VANGUARD GROUP INC Institution	+$298.0K +185.1K shares	$11.0M 6.8M shares
$DEUTSCHE BANK AG\ logo$ DEUTSCHE BANK AG\ Institution	+$191.1K +118.7K shares	$194.9K 121.0K shares
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	+$176.1K +109.4K shares	$312.9K 194.4K shares
GSA CAPITAL PARTNERS LLP Hedge Fund•Quant	+$148.8K +92.4K shares	$835.6K 519.0K shares
GEODE CAPITAL MANAGEMENT LLC ETF Provider	+$103.0K +64.0K shares	$3.6M 2.3M shares

Biggest Sellers

Institution	Net Sold	Current Position
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	−$1.3M −812.5K shares	$506.7K 314.7K shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	−$1.0M −626.1K shares	$1.4M 863.6K shares
Marshall Wace LLP Institution	−$575.6K −357.5K shares	$3.8M 2.4M shares
UBS Group AG Institution	−$361.8K −224.7K shares	$136.8K 85.0K shares
X XTX Topco Ltd Institution	−$168.4K −76.9K shares	Sold Off 0 shares
Atom Investors LP Hedge Fund•Market Neutral	−$119.6K −54.6K shares	Sold Off 0 shares
TWO SIGMA INVESTMENTS LLC Hedge Fund•Multi-Strategy	−$83.4K −51.8K shares	$234.8K 145.9K shares
C Cubist Systematic Strategies, LLC Institution	−$68.6K −31.3K shares	Sold Off 0 shares
CITIGROUP INC Institution	−$61.4K −38.1K shares	$6.9K 4.3K shares
MORGAN STANLEY RIA/Wealth	−$47.8K −29.7K shares	$1.7M 1.1M shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited SLS in Q3 2025

New Positions: 15
New Value: $1.1M
Exited Positions: 5
Exited Value: $363.3K

New Positions

Institution	Position Value
Everhart Financial Group, Inc. RIA/Wealth	$533.2K 331.2K shares
STONERIDGE INVESTMENT PARTNERS LLC Long Only Manager	$86.5K 53.7K shares
I INSTRUMENTAL WEALTH, LLC RIA/Wealth	$85.8K 44.9K shares
NORTHSTAR ASSET MANAGEMENT LLC RIA/Wealth	$64.9K 40.3K shares
T Tyche Wealth Partners LLC Institution	$60.4K 37.5K shares
T TRUSTMARK NATIONAL BANK TRUST DEPARTMENT Institution	$58.8K 36.5K shares
Genesee Capital Advisors, LLC RIA/Wealth	$48.3K 30.0K shares
S Scissortail Wealth Management, LLC RIA/Wealth	$44.0K 27.3K shares
S SEI INVESTMENTS CO Institution	$42.8K 26.6K shares
Kestra Advisory Services, LLC RIA/Wealth	$42.5K 26.4K shares

Exited Positions

Institution	Previous Position
X XTX Topco Ltd Institution	$168.4K 76.9K shares
Atom Investors LP Hedge Fund•Market Neutral	$119.6K 54.6K shares
C Cubist Systematic Strategies, LLC Institution	$68.6K 31.3K shares
RAYMOND JAMES FINANCIAL INC RIA/Wealth	$5.8K 2.7K shares
Quantbot Technologies LLC Hedge Fund•Quant	$852.0 389.0 shares

Options Activity

Institutions with the largest Call and Put options positions in SLS as of Q3 2025

Call Positions: 5
Call Value: $9.9M
Put Positions: 2
Put Value: $202.4K

Call Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$4.5M 27.9K contracts
C Caligan Partners LP Hedge Fund•Activist	$3.7M 23.0K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$858.3K 5.3K contracts
DIADEMA PARTNERS LP Hedge Fund•Long/Short	$644.0K 4.0K contracts
J JANE STREET GROUP, LLC Institution	$203.2K 1.3K contracts

Put Positions

Institution	Position Value
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$105.3K 654.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$97.1K 603.0 contracts

Most Committed Institutions

Institutions with SLS as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
Frigate Ventures LP RIA/Wealth	Anthony Lawrence Moore CFO	1.17% $9.7M	4.83% 6.0M shares	Q1 2024 Held for 1y 8m	$827.1M
GSA CAPITAL PARTNERS LLP Hedge Fund•Quant	David Khabie-Zeitoune CEO	0.07% $835.6K	0.42% 519.0K shares	Q1 2025 Held for 8 months	$1.1B
I INSTRUMENTAL WEALTH, LLC RIA/Wealth	David Scott Silver CEO	0.06% $85.8K	0.04% 44.9K shares	Q3 2025 Held for 2 months	$142.6M
STONERIDGE INVESTMENT PARTNERS LLC Long Only Manager	Steven Leroy Sanders CEO	0.06% $86.5K	0.04% 53.7K shares	Q3 2025 Held for 2 months	$144.0M
Everhart Financial Group, Inc. RIA/Wealth	Richard Scott Everhart President	0.05% $533.2K	0.26% 331.2K shares	Q3 2025 Held for 2 months	$998.1M
Opus Capital Group, LLC RIA/Wealth	Joseph Patrick Condren COO	0.05% $402.5K	0.20% 250.0K shares	Q4 2022 Held for 2y 11m	$866.0M
Grange Capital, LLC RIA/Wealth	Michael Brent Keeton CIO	0.02% $21.7K	0.01% 13.5K shares	Q1 2025 Held for 8 months	$103.5M
Genesee Capital Advisors, LLC RIA/Wealth	Michael Christopher Hearn Founder	0.02% $48.3K	0.02% 30.0K shares	Q3 2025 Held for 2 months	$230.2M
NORTHSTAR ASSET MANAGEMENT LLC RIA/Wealth	John Gerard Carson CEO	0.01% $64.9K	0.03% 40.3K shares	Q3 2025 Held for 2 months	$452.4M
Caitong International Asset Management Co., Ltd RIA/Wealth	Dusan Thomas Zachystal CEO	0.01% $17.4K	0.01% 10.8K shares	Q2 2025 Held for 5 months	$144.7M

Hedge Fund Spotlight

Discover hedge funds investing in SLS

GSA CAPITAL PARTNERS LLP

Hedge Fund • Quant

Portfolio ManagerDavid Khabie-Zeitoune

Portfolio Value: $1.1B
Positions: 1,504
Last Reported: Q3 2025

Sector Allocation

Position in SELLAS Life Sciences Group, Inc.

Market Value: $835.6K
Shares Held: 519.0K
Portfolio Weight: 0.07%
Owned Since: 2025-Q1

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