Sellas Life Sciences Group, Inc.: which funds bought and sold

Institutions that bought and sold Sellas Life Sciences Group shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 138 institutions that filed 13F reports for both quarters added to or opened positions in Sellas Life Sciences Group, and 49 cut or closed them. Together they added a net 19.9M shares, +37.1% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 2.6M shares (+70.0%); index fund managers were net buyers of 10.4M shares (+28.3%). 60 opened a new position and 25 sold out entirely.

Bought, Q2 2026 138 institutions, 60 of them new holders Sold, Q2 2026 49 institutions, 25 of them sold out

Net change, all compared +19.9M shares (+37.1%)

Net change, active managers +2.6M shares (+70.0%), 18 bought, 11 sold

Buyers versus sellers

institutions compared, 212

138 bought 25 49 sold

Active managers and hedge funds 18 bought · 11 sold · +2.6M

Index fund managers 9 bought · 2 sold · +10.4M

Other institutions 111 bought · 36 sold · +6.9M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
State Street Corp Index funds	+4.6M +54.8%	13.0M	$192M
Anson Funds Management LP Hedge fund	+4.5M New position	4.5M	$66.4M
Blackrock, Inc. Index funds	+2.9M +23.5%	15.1M	$222M
Susquehanna International Group, LLP	+1.7M +416.5%	2.1M	$30.3M
BNP Paribas Financial Markets	+1.0M +2180.1%	1.1M	$15.8M
Geode Capital Management, LLC Index funds	+972K +24.8%	4.9M	$72.1M
Vanguard Capital Management LLC Index funds	+700K +9.3%	8.2M	$121M
Vanguard Portfolio Management LLC Index funds	+698K +47.7%	2.2M	$31.9M
Jones Financial Companies LLLP	+629K +37.6%	2.3M	$28.6M
Jane Street Group, LLC	+508K New position	508K	$7.5M
UBS Group AG	+507K +68.1%	1.3M	$18.5M
Swiss National Bank	+360K New position	360K	$5.3M
Xtx Topco Ltd	+359K New position	359K	$5.3M
Northern Trust Corp Index funds	+344K +27.0%	1.6M	$23.9M
Renaissance Technologies LLC Hedge fund	+310K New position	310K	$4.6M
Citigroup Inc	+301K +1173.5%	327K	$4.8M
UBS Am, A Distinct Business Unit Of UBS Asset Management Americas LLC	+273K New position	273K	$4M
Wellington Management Group LLP Active manager	+253K +73.2%	597K	$8.8M
Dagco, Inc.	+204K +19.8%	1.2M	$18.2M
Jefferies Financial Group Inc.	+200K New position	200K	$3M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Anson Funds Management LP Hedge fund	+4.5M New position	4.5M	$66.4M
Renaissance Technologies LLC Hedge fund	+310K New position	310K	$4.6M
Wellington Management Group LLP Active manager	+253K +73.2%	597K	$8.8M
Franklin Resources Inc Active manager	+119K New position	119K	$1.8M
Highbridge Capital Management LLC Hedge fund	+99K New position	99K	$1.5M
Gotham Asset Management, LLC Hedge fund	+74K New position	74K	$1.1M
Alliancebernstein L.P. Active manager	+72K +44.0%	236K	$998,534
Mangrove Partners Im, LLC Hedge fund	+34K New position	34K	$503,906
Price T Rowe Associates Inc Active manager	+33K +27.0%	155K	$2.3M
Sculptor Capital LP Hedge fund	+30K New position	30K	$447,228

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Marshall Wace, LLP Hedge fund	−2.0M Sold out	0	—
Two Sigma Investments, LP Hedge fund	−403K Sold out	0	—
Invesco Ltd.	−323K −46.2%	375K	$5.5M
Vision Financial Markets LLC	−295K −96.8%	9,800	$144,648
Nuveen, LLC	−252K −37.6%	419K	$6.2M
Virtu Financial LLC	−222K Sold out	0	—
Millennium Management LLC Hedge fund	−160K Sold out	0	—
Simplex Trading, LLC	−141K −47.8%	154K	$2.3M
Morgan Stanley	−100K −7.5%	1.2M	$18.2M
Balyasny Asset Management L.P. Hedge fund	−82K Sold out	0	—
Everhart Financial Group, Inc.	−76K −21.0%	288K	$4.3M
Engineers Gate Manager LP Hedge fund	−68K −81.9%	15K	$221,326
Gsa Capital Partners LLP	−67K −40.9%	96K	$1.4M
Citadel Advisors LLC Hedge fund	−65K Sold out	0	—
Squarepoint Ops LLC Hedge fund	−64K −85.9%	11K	$155,157
Caitong International Asset Management Co., Ltd	−60K −99.0%	634	$9,358
Entrypoint Capital, LLC	−48K Sold out	0	—
Farallon Capital Management, L.L.C. Hedge fund	−40K Sold out	0	—
Quantinno Capital Management LP	−37K −50.2%	37K	$546,651
Fulcrum Wealth Advisors, LLC	−36K −32.9%	73K	$1.1M

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Marshall Wace, LLP Hedge fund	−2.0M Sold out	0	—
Two Sigma Investments, LP Hedge fund	−403K Sold out	0	—
Millennium Management LLC Hedge fund	−160K Sold out	0	—
Balyasny Asset Management L.P. Hedge fund	−82K Sold out	0	—
Engineers Gate Manager LP Hedge fund	−68K −81.9%	15K	$221,326
Citadel Advisors LLC Hedge fund	−65K Sold out	0	—
Squarepoint Ops LLC Hedge fund	−64K −85.9%	11K	$155,157
Farallon Capital Management, L.L.C. Hedge fund	−40K Sold out	0	—
Magnetar Financial LLC Hedge fund	−35K Sold out	0	—
Intech Investment Management LLC Active manager	−19K −37.2%	32K	$475,006

New positions

largest by value

Institution	Shares	Value June 30, 2026
Anson Funds Management LPHedge fund	4.5M	$66.4M
Jane Street Group, LLC	508K	$7.5M
Swiss National Bank	360K	$5.3M
Xtx Topco Ltd	359K	$5.3M
Renaissance Technologies LLCHedge fund	310K	$4.6M
UBS Am, A Distinct Business Unit Of UBS Asset Management Americas LLC	273K	$4M
Jefferies Financial Group Inc.	200K	$3M
Alps Advisors Inc	188K	$2.8M
Vanguard Asset Management, Ltd	126K	$1.9M
Franklin Resources IncActive manager	119K	$1.8M

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Marshall Wace, LLPHedge fund	2.0M	$8.6M
Two Sigma Investments, LPHedge fund	403K	$1.7M
Virtu Financial LLC	222K	$938,000
Millennium Management LLCHedge fund	160K	$674,787
Balyasny Asset Management L.P.Hedge fund	82K	$345,570
Citadel Advisors LLCHedge fund	65K	$273,431
Entrypoint Capital, LLC	48K	$203,988
Farallon Capital Management, L.L.C.Hedge fund	40K	$169,200
Magnetar Financial LLCHedge fund	35K	$148,185
Scientech Research LLC	34K	$144,226

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 191
Ten largest holders: 74.8%
Index fund managers: 64.2%
Active managers and hedge funds: 8.7%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	18	11	11	8	+2.6M	+70.0%
Index fund managers	9	2	0	0	+10.4M	+28.3%
Other institutions	111	36	49	17	+6.9M	+52.6%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Sellas Life Sciences Group.

Only managers that filed a holdings report for both quarters are compared (212 here). 10 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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