Cartesian Therapeutics, Inc.: which funds bought and sold

Institutions that bought and sold Cartesian Therapeutics 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, 68 institutions that filed 13F reports for both quarters added to or opened positions in Cartesian Therapeutics, and 24 cut or closed them. Together they added a net 1.3M shares, +18.7% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 377K shares (+8.3%); index fund managers were net buyers of 580K shares (+33.5%). 25 opened a new position and 12 sold out entirely.

Bought, Q2 2026 68 institutions, 25 of them new holders Sold, Q2 2026 24 institutions, 12 of them sold out

Net change, all compared +1.3M shares (+18.7%)

Net change, active managers +377K shares (+8.3%), 15 bought, 6 sold

Buyers versus sellers

institutions compared, 105

68 bought 13 24 sold

Active managers and hedge funds 15 bought · 6 sold · +377K

Index fund managers 9 bought · 0 sold · +580K

Other institutions 44 bought · 18 sold · +381K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
683 Capital Management, LLC Hedge fund	+320K +97.0%	650K	$6.8M
AQR Capital Management LLC Hedge fund	+272K +324.3%	356K	$3.7M
Blackrock, Inc. Index funds	+220K +36.7%	819K	$8.5M
Vanguard Capital Management LLC Index funds	+148K +36.4%	556K	$5.8M
Two Sigma Investments, LP Hedge fund	+129K +77.1%	296K	$3.1M
ADAR1 Capital Management, LLC Hedge fund	+99K New position	99K	$1M
Geode Capital Management, LLC Index funds	+93K +35.2%	357K	$3.7M
Diadema Partners LP	+87K New position	87K	$907,134
Bank Of America Corp	+85K New position	85K	$881,782
Walleye Capital LLC Hedge fund	+82K New position	82K	$852,648
UBS Group AG	+72K +52.5%	209K	$2.2M
Jump Financial, LLC	+67K New position	67K	$696,056
Cm Management, LLC	+60K New position	60K	$625,200
BNP Paribas Financial Markets	+54K +543.0%	64K	$666,640
Goldman Sachs Group Inc	+50K +160.5%	81K	$839,560
State Street Corp Index funds	+49K +24.4%	249K	$2.6M
Point72 Asset Management, L.P. Hedge fund	+44K New position	44K	$454,590
Trexquant Investment LP Hedge fund	+41K New position	41K	$427,699
D. E. Shaw & Co., Inc. Hedge fund	+29K New position	29K	$298,543
Atlatl Advisers LLC	+29K New position	29K	$297,064

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
683 Capital Management, LLC Hedge fund	+320K +97.0%	650K	$6.8M
AQR Capital Management LLC Hedge fund	+272K +324.3%	356K	$3.7M
Two Sigma Investments, LP Hedge fund	+129K +77.1%	296K	$3.1M
ADAR1 Capital Management, LLC Hedge fund	+99K New position	99K	$1M
Walleye Capital LLC Hedge fund	+82K New position	82K	$852,648
Point72 Asset Management, L.P. Hedge fund	+44K New position	44K	$454,590
Trexquant Investment LP Hedge fund	+41K New position	41K	$427,699
D. E. Shaw & Co., Inc. Hedge fund	+29K New position	29K	$298,543
Millennium Management LLC Hedge fund	+26K +9.0%	310K	$3.2M
Brevan Howard Capital Management LP Hedge fund	+19K New position	19K	$201,783

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
FMR LLC Active manager	−431K −53.9%	368K	$3.8M
Erste Asset Management Gmbh	−198K −89.4%	24K	$227,176
Citadel Advisors LLC Hedge fund	−110K Sold out	0	—
Jacobs Levy Equity Management, Inc Active manager	−102K Sold out	0	—
Renaissance Technologies LLC Hedge fund	−47K −69.8%	20K	$211,526
Diametric Capital, LP	−38K Sold out	0	—
Privium Fund Management B.V.	−27K −15.3%	152K	$1.6M
Man Group PLC Hedge fund	−24K Sold out	0	—
Marshall Wace, LLP Hedge fund	−18K −7.2%	233K	$2.4M
Ameriprise Financial Inc	−13K Sold out	0	—
Public Employees Retirement System Of Ohio	−13K Sold out	0	—
Xtx Topco Ltd	−11K −35.5%	19K	$202,096
Morgan Stanley	−5,118 −34.6%	9,687	$100,938
Mirae Asset Global Investments Co., Ltd.	−3,715 Sold out	0	—
Wedbush Securities Inc	−1,000 −8.7%	11K	$109,000
Gamma Investing LLC	−607 −74.8%	205	$2,136
California State Teachers Retirement System	−420 −74.1%	147	$1,532
Essential Partners LLC	−165 −27.6%	432	$4,501
Physician Wealth Advisors, Inc.	−144 Sold out	0	—
Optiver Holding B.V.	−104 Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
FMR LLC Active manager	−431K −53.9%	368K	$3.8M
Citadel Advisors LLC Hedge fund	−110K Sold out	0	—
Jacobs Levy Equity Management, Inc Active manager	−102K Sold out	0	—
Renaissance Technologies LLC Hedge fund	−47K −69.8%	20K	$211,526
Man Group PLC Hedge fund	−24K Sold out	0	—
Marshall Wace, LLP Hedge fund	−18K −7.2%	233K	$2.4M

New positions

largest by value

Institution	Shares	Value June 30, 2026
ADAR1 Capital Management, LLCHedge fund	99K	$1M
Diadema Partners LP	87K	$907,134
Bank Of America Corp	85K	$881,782
Walleye Capital LLCHedge fund	82K	$852,648
Jump Financial, LLC	67K	$696,056
Cm Management, LLC	60K	$625,200
Point72 Asset Management, L.P.Hedge fund	44K	$454,590
Trexquant Investment LPHedge fund	41K	$427,699
D. E. Shaw & Co., Inc.Hedge fund	29K	$298,543
Atlatl Advisers LLC	29K	$297,064

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Citadel Advisors LLCHedge fund	110K	$677,287
Jacobs Levy Equity Management, IncActive manager	102K	$624,434
Diametric Capital, LP	38K	$234,124
Man Group PLCHedge fund	24K	$145,749
Ameriprise Financial Inc	13K	$82,508
Public Employees Retirement System Of Ohio	13K	$79,950
Mirae Asset Global Investments Co., Ltd.	3,715	$22,847
Physician Wealth Advisors, Inc.	144	$886
Optiver Holding B.V.	104	$640
Mai Capital Management	24	$148

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 94
Ten largest holders: 71.6%
Index fund managers: 26.6%
Active managers and hedge funds: 56.4%

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	15	6	7	3	+377K	+8.3%
Index fund managers	9	0	0	0	+580K	+33.5%
Other institutions	44	18	18	9	+381K	+42.4%

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 Cartesian Therapeutics.

Only managers that filed a holdings report for both quarters are compared (105 here). 2 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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