Comparable stake leader
BlackRock, Inc.
SEC ownership of SELLAS Life Sciences Group, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001390478.
Disclosed value leader
BlackRock, Inc.
Comparable rows
5/50
Latest evidence
30 Sep 2026
- Public ticker
- SLS on Nasdaq
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
5 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Sep 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001390478
- Issuer location
- New York, NY
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of SELLAS Life Sciences Group, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
5/50
Latest evidence
30 Sep 2026
13D/G
13F
3/4/5
Lead comparable stake: 7.9%
45 rows are not safely comparable across share classes.
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 7.9%.
5 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
7.9%
VANGUARD CAPITAL MANAGEMENT LLC
5.2%
STATE STREET CORP
5.1%
Anson Funds Management LP
4.9%
HIGHBRIDGE CAPITAL MANAGEMENT LLC
3.7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13D/G
|
7.9%
Reported 13D/G
· 30 Sep 2026
|
$195,392,752
15,872,685 shares
|
+$45,994,518 | 30 Sep 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5.2%
Reported 13D/G
· 30 Jun 2026
|
$121,988,428
9,666,278 shares
|
$0 | 30 Jun 2026 |
| STATE STREET CORP |
13D/G
13F
STATE STREET CORPORATION · Company
|
5.1%
Reported 13D/G
· 30 Sep 2026
|
$128,729,848
10,373,074 shares
|
-$32,557,436 | 30 Sep 2026 |
| Anson Funds Management LP |
13D/G
|
4.9%
Reported 13D/G
· 31 Dec 2025
|
$31,046,889
7,481,178 shares
|
+$6,010,196 | 31 Dec 2025 |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC |
13D/G
|
3.7%
Reported 13D/G
· 31 Dec 2025
|
$24,560,261
6,514,658 shares
|
$0 | 31 Dec 2025 |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
Company
|
—
denominator unverified
|
$63,677,118
5,171,819 shares
|
— | 30 Sep 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
Company
|
—
denominator unverified
|
$28,283,222
2,297,581 shares
|
— | 30 Sep 2026 |
| MORGAN STANLEY |
13F
Company
|
—
denominator unverified
|
$18,601,728
1,511,107 shares
|
— | 30 Sep 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$100,806.
Buys
$100,806
Insiders: 1
Sells
$0
Insiders: 0
Net
+$100,806
Shares: +63,400
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 63,400
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 63,400 | 0 | $100,806 | $0 | +$100,806 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-10 of 10 reporting-owner rows connected to SELLAS Life Sciences Group, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
10
Largest Forms 3/4/5 holder
Angelos M. Stergiou
Net 12M change
+$100.81K
Full value: +$100,806 · USD · 12-month changeLatest report
16 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Angelos M. Stergiou | President and CEO, Director | $7,441,344 | Mixed | 16 Jun 2026 | ||
| Dragan Cicic | SVP, Chief Development Officer | $2,102,590 | Mixed | 07 Jan 2026 | ||
| John Thomas Burns | Cfo | $2,089,480 | Mixed | 07 Jan 2026 | ||
| Barbara A. Wood | EVP, Gen. Counsel, Corp. Sec. | $821,565 | Mixed | 22 Jan 2024 | ||
| Katherine Bach Kalin | Director | $581,995 | +$100,806 | +21% | Mixed | 07 Jan 2026 |
| Jane Wasman | Director | $350,177 | Mixed | 07 Jan 2026 | ||
| Robert L. van Nostrand | Director | $312,483 | Mixed | 07 Jan 2026 | ||
| Robert Francomano | Chief Commercial Officer | $278,365 | Mixed | 22 Jan 2024 | ||
| David A. Scheinberg | Director | $275,475 | Mixed | 07 Jan 2026 | ||
| John Varian | Director | $274,789 | Mixed | 07 Jan 2026 |
Recent insider transactions for SELLAS Life Sciences Group, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Angelos M. Stergiou | SLS | Common Stock | Award | 153.4% | 1,065,000 | 1,759,183 | 16 Jun 2026 | Direct | ||
| John Varian | SLS | Common Stock | Award | 218.3% | 50,000 | 72,900 | 07 Jan 2026 | Direct | ||
| Robert L. van Nostrand | SLS | Common Stock | Award | 152% | 50,000 | 82,900 | 07 Jan 2026 | Direct | ||
| David A. Scheinberg | SLS | Common Stock | Award | 216.6% | 50,000 | 73,082 | 07 Jan 2026 | Direct | ||
| Dragan Cicic | SLS | Common Stock | Award | 116.4% | 300,000 | 557,805 | 07 Jan 2026 | Direct | ||
| John Thomas Burns | SLS | Common Stock | Award | 118% | 300,000 | 554,327 | 07 Jan 2026 | Direct | ||
| Katherine Bach Kalin | SLS | Common Stock | Award | 47.9% | 50,000 | 154,400 | 07 Jan 2026 | Direct | ||
| Jane Wasman | SLS | Common Stock | Award | 116.6% | 50,000 | 92,900 | 07 Jan 2026 | Direct | ||
| Dragan Cicic | SLS | Common Stock | Other | -19.8% | -63,800 | 257,805 | 03 Dec 2025 | Direct | ||
| John Thomas Burns | SLS | Common Stock | Other | -18.7% | -58,592 | 254,327 | 03 Dec 2025 | Direct | ||
| Angelos M. Stergiou | SLS | Common Stock | Other | -21.4% | -187,066 | 686,966 | 03 Dec 2025 | Direct | ||
| Katherine Bach Kalin | SLS | Common Stock | Purchase | 154.6% | $100,806 | $1.59 | 63,400 | 104,400 | 19 Nov 2025 | Direct |
* marks a reported price that did not pass the local price check.