Cellectar Biosciences, Inc.: which funds bought and sold

Institutions that bought and sold Cellectar Biosciences 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, 19 institutions that filed 13F reports for both quarters added to or opened positions in Cellectar Biosciences, and 6 cut or closed them. Together they added a net 2.9M shares, +931.6% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 1.2M shares (+12316300.0%); index fund managers were net buyers of 291K shares (+186.3%). 13 opened a new position and 4 sold out entirely.

Bought, Q2 2026 19 institutions, 13 of them new holders Sold, Q2 2026 6 institutions, 4 of them sold out

Net change, all compared +2.9M shares (+931.6%)

Net change, active managers +1.2M shares (+12316300.0%), 5 bought, 1 sold

Buyers versus sellers

institutions compared, 32

19 bought 7 6 sold

Active managers and hedge funds 5 bought · 1 sold · +1.2M

Index fund managers 4 bought · 1 sold · +291K

Other institutions 10 bought · 4 sold · +1.4M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Caligan Partners LP Hedge fund	+470K New position	470K	$1.3M
Nantahala Capital Management, LLC Hedge fund	+440K New position	440K	$1.2M
Stempoint Capital LP	+355K New position	355K	$986,728
Silverarc Capital Management, LLC	+322K New position	322K	$894,404
Vanguard Capital Management LLC Index funds	+245K +299.8%	327K	$910,080
Balyasny Asset Management L.P. Hedge fund	+220K New position	220K	$611,600
Empery Asset Management, LP	+190K New position	190K	$527,102
Bleichroeder LP	+189K +188.7%	289K	$802,528
Diadema Partners LP	+138K New position	138K	$384,588
Stonepine Capital Management, LLC	+105K New position	105K	$290,649
Persistent Asset Partners Ltd	+93K New position	93K	$258,493
Boothbay Fund Management, LLC Hedge fund	+85K New position	85K	$236,492
Vanguard Fiduciary Trust Co Index funds	+30K +178.9%	46K	$128,492
Acadian Asset Management LLC Active manager	+17K New position	17K	$46,000
Northern Trust Corp Index funds	+15K New position	15K	$41,252
Sequoia Financial Advisors, LLC	+3,000 +15.9%	22K	$60,743
Geode Capital Management, LLC Index funds	+573 +1.1%	53K	$148,323
Barclays PLC	+561 New position	561	$1,560
Osaic Holdings, Inc.	+6 +600.0%	7	$18

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Caligan Partners LP Hedge fund	+470K New position	470K	$1.3M
Nantahala Capital Management, LLC Hedge fund	+440K New position	440K	$1.2M
Balyasny Asset Management L.P. Hedge fund	+220K New position	220K	$611,600
Boothbay Fund Management, LLC Hedge fund	+85K New position	85K	$236,492
Acadian Asset Management LLC Active manager	+17K New position	17K	$46,000

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Warberg Asset Management LLC	−14K Sold out	0	—
UBS Group AG	−6,554 −67.9%	3,093	$8,599
Tower Research Capital LLC (TRC)	−793 Sold out	0	—
Vanguard Global Advisers, LLC	−563 Sold out	0	—
Blackrock, Inc. Index funds	−10 −0.2%	4,735	$13,163
FMR LLC Active manager	−10 Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
FMR LLC Active manager	−10 Sold out	0	—

New positions

largest by value

Institution	Shares	Value June 30, 2026
Caligan Partners LPHedge fund	470K	$1.3M
Nantahala Capital Management, LLCHedge fund	440K	$1.2M
Stempoint Capital LP	355K	$986,728
Silverarc Capital Management, LLC	322K	$894,404
Balyasny Asset Management L.P.Hedge fund	220K	$611,600
Empery Asset Management, LP	190K	$527,102
Diadema Partners LP	138K	$384,588
Stonepine Capital Management, LLC	105K	$290,649
Persistent Asset Partners Ltd	93K	$258,493
Boothbay Fund Management, LLCHedge fund	85K	$236,492

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Warberg Asset Management LLC	14K	$35,306
Tower Research Capital LLC (TRC)	793	$2,014
Vanguard Global Advisers, LLC	563	$1,430
FMR LLCActive manager	10	$25

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 29
Ten largest holders: 86.9%
Index fund managers: 12.8%
Active managers and hedge funds: 35.4%

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	5	1	5	1	+1.2M	+12316300.0%
Index fund managers	4	1	1	0	+291K	+186.3%
Other institutions	10	4	7	3	+1.4M	+887.1%

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 Cellectar Biosciences.

Only managers that filed a holdings report for both quarters are compared (32 here). 1 other holder is 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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