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SELLAS Life Sciences Group, Inc. (SLS) institutional ownership

Market cap$186M SectorHealthcare
Funds holding · Q1 2026
150
reported SLS position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
117 buyers · 33 sellers

SELLAS Life Sciences Group, Inc. (SLS) price and institutional activity

Dates

Q1 2026

$0 bought by 117 investors
State StreetBlackRock +115 more
$0 sold by 33 investors
Millennium Management LLCTwo Sigma Investments, LP +31 more
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Bought Sold Totals per quarter; hover a bar for the names.

SELLAS Life Sciences Group, Inc. (SLS) institutional activity · 150

Investor Type Est. change Change Δ Own Date
State Street · Added
Change +6.2M Date Q1 2026
State Street Added· Q1 2026 +6.2M Q1 2026
BlackRock · Added
Change +4.7M Date Q1 2026
BlackRock Added· Q1 2026 +4.7M Q1 2026
Vanguard · Added
Change +1.9M Date Q1 2026
Vanguard Added· Q1 2026 +1.9M Q1 2026
Jones Financial Companies Lllp · Added
Change +1.2M Date Q1 2026
Jones Financial Companies Lllp Added· Q1 2026 +1.2M Q1 2026
Millennium Management LLC · Reduced
Change −1.2M Date Q1 2026
Millennium Management LLC Reduced· Q1 2026 −1.2M Q1 2026
Geode · Added
Change +835K Date Q1 2026
Geode Added· Q1 2026 +835K Q1 2026
UBS Group AG · Added
Change +697K Date Q1 2026
UBS Group AG Added· Q1 2026 +697K Q1 2026
Marshall Wace, LLP · Added
Change +696K Date Q1 2026
Marshall Wace, LLP Added· Q1 2026 +696K Q1 2026
Two Sigma Investments, LP · Reduced
Change −679K Δ Own −62.7% Date Q1 2026
Two Sigma Investments, LP Reduced· Q1 2026 −679K −62.7% Q1 2026
Invesco Ltd. · Added
Change +645K Δ Own +1209.9% Date Q1 2026
Invesco Ltd. Added· Q1 2026 +645K +1209.9% Q1 2026
Bank of America Corp · Added
Change +541K Date Q1 2026
Bank of America Corp Added· Q1 2026 +541K Q1 2026
Clear Street Group Inc. · Exited
Change −500K Δ Own −100.0% Date Q1 2026
Clear Street Group Inc. Exited· Q1 2026 −500K −100.0% Q1 2026
Barclays PLC · Reduced
Change −479K Date Q1 2026
Barclays PLC Reduced· Q1 2026 −479K Q1 2026
Dagco, Inc. · Added
Change +451K Date Q1 2026
Dagco, Inc. Added· Q1 2026 +451K Q1 2026
Morgan Stanley · Added
Change +445K Date Q1 2026
Morgan Stanley Added· Q1 2026 +445K Q1 2026
Data through Q1 2026 · filed Jun 3, 2026
15 of 150

Famous investor activity in SELLAS Life Sciences Group, Inc. (SLS)

SELLAS Life Sciences Group, Inc. (SLS) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Stergiou Angelos M. · Director Grant (A) 1.1M
Owned 1.8M Trade date Jun 16, 2026 Filed date Jun 18, 2026
Stergiou Angelos M. Director Grant (A) 1.1M 1.8M Jun 16, 2026 Jun 18, 2026
Varian John · Director Grant (A) 50K
Owned 73K Trade date Jan 7, 2026 Filed date Jan 9, 2026
Varian John Director Grant (A) 50K 73K Jan 7, 2026 Jan 9, 2026
Van Nostrand Robert L. · Director Grant (A) 50K
Owned 83K Trade date Jan 7, 2026 Filed date Jan 9, 2026
Van Nostrand Robert L. Director Grant (A) 50K 83K Jan 7, 2026 Jan 9, 2026
Scheinberg David A. · Director Grant (A) 50K
Owned 73K Trade date Jan 7, 2026 Filed date Jan 9, 2026
Scheinberg David A. Director Grant (A) 50K 73K Jan 7, 2026 Jan 9, 2026
Cicic Dragan · Officer Grant (A) 300K
Owned 558K Trade date Jan 7, 2026 Filed date Jan 9, 2026
Cicic Dragan Officer Grant (A) 300K 558K Jan 7, 2026 Jan 9, 2026
Burns John Thomas · Officer Grant (A) 300K
Owned 554K Trade date Jan 7, 2026 Filed date Jan 9, 2026
Burns John Thomas Officer Grant (A) 300K 554K Jan 7, 2026 Jan 9, 2026
Kalin Katherine Bach · Director Grant (A) 50K
Owned 154K Trade date Jan 7, 2026 Filed date Jan 9, 2026
Kalin Katherine Bach Director Grant (A) 50K 154K Jan 7, 2026 Jan 9, 2026
Wasman Jane · Director Grant (A) 50K
Owned 93K Trade date Jan 7, 2026 Filed date Jan 9, 2026
Wasman Jane Director Grant (A) 50K 93K Jan 7, 2026 Jan 9, 2026
Cicic Dragan · Officer Other Form 4 events -$96K
Price $1.50 Qty -64K Owned 258K Trade date Dec 3, 2025 Filed date Dec 5, 2025
Cicic Dragan Officer Other Form 4 events $1.50 -64K -$96K 258K Dec 3, 2025 Dec 5, 2025
Burns John Thomas · Officer Other Form 4 events -$88K
Price $1.50 Qty -59K Owned 254K Trade date Dec 3, 2025 Filed date Dec 5, 2025
Burns John Thomas Officer Other Form 4 events $1.50 -59K -$88K 254K Dec 3, 2025 Dec 5, 2025
Stergiou Angelos M. · Director, Officer Other Form 4 events -$281K
Price $1.50 Qty -187K Owned 687K Trade date Dec 3, 2025 Filed date Dec 5, 2025
Stergiou Angelos M. Director, Officer Other Form 4 events $1.50 -187K -$281K 687K Dec 3, 2025 Dec 5, 2025
Kalin Katherine Bach · Director Buy +$101K
Price $1.59 Qty +63K Owned 104K Trade date Nov 19, 2025 Filed date Nov 21, 2025
Kalin Katherine Bach Director Buy $1.59 +63K +$101K 104K Nov 19, 2025 Nov 21, 2025
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SELLAS Life Sciences Group, Inc. (SLS) activist and large shareholders

What are Schedules 13D and 13G?

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
Blackrock, Inc. 12.1M
% of shares outstanding 6.8% Filing date Apr 24, 2026
Blackrock, Inc. 12.1M 6.8% Apr 24, 2026
The Vanguard Group 6.7M
% of shares outstanding 6.7% Filing date Jul 29, 2025
The Vanguard Group 6.7M 6.7% Jul 29, 2025
Anson Funds Management LP 6.0M
% of shares outstanding 5.7% Filing date Nov 14, 2025
Anson Funds Management LP 6.0M 5.7% Nov 14, 2025
3 of 3

SELLAS Life Sciences Group, Inc. (SLS) ownership FAQ

Who owns SLS?

150 reporting institutions disclosed SLS position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.