Korro Bio, Inc.: which funds bought and sold

Institutions that bought and sold Korro Bio 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, 67 institutions that filed 13F reports for both quarters added to or opened positions in Korro Bio, and 30 cut or closed them. Together they added a net 2.3M shares, +17.9% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 989K shares (+25.6%); index fund managers were net buyers of 869K shares (+64.1%). 19 opened a new position and 11 sold out entirely.

Bought, Q2 2026 67 institutions, 19 of them new holders Sold, Q2 2026 30 institutions, 11 of them sold out

Net change, all compared +2.3M shares (+17.9%)

Net change, active managers +989K shares (+25.6%), 13 bought, 9 sold

Buyers versus sellers

institutions compared, 116

67 bought 19 30 sold

Active managers and hedge funds 13 bought · 9 sold · +989K

Index fund managers 9 bought · 0 sold · +869K

Other institutions 45 bought · 21 sold · +437K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Nantahala Capital Management, LLC Hedge fund	+660K +100.0%	1.3M	$17.4M
Blackrock, Inc. Index funds	+358K +77.7%	818K	$10.8M
Adage Capital Partners Gp, L.L.C. Hedge fund	+313K +136.9%	541K	$7.1M
Kalehua Capital Management LLC	+296K +270.3%	405K	$5.3M
Vanguard Capital Management LLC Index funds	+144K +46.3%	455K	$6M
Geode Capital Management, LLC Index funds	+123K +71.0%	297K	$3.9M
State Street Corp Index funds	+92K +65.7%	233K	$3.1M
UBS Group AG	+84K +386.5%	105K	$1.4M
Vanguard Portfolio Management LLC Index funds	+75K +50.5%	224K	$2.9M
Goldman Sachs Group Inc	+66K +131.5%	117K	$1.5M
Jpmorgan Chase & Co	+56K +82.1%	125K	$1.6M
Millennium Management LLC Hedge fund	+55K +86.2%	118K	$1.6M
Walleye Capital LLC Hedge fund	+54K New position	54K	$715,529
Bank Of America Corp	+52K New position	52K	$681,498
D. E. Shaw & Co., Inc. Hedge fund	+34K New position	34K	$450,927
Jump Financial, LLC	+34K New position	34K	$446,881
Vanguard Fiduciary Trust Co Index funds	+33K +80.3%	75K	$987,195
AQR Capital Management LLC Hedge fund	+31K +11.7%	299K	$3.9M
Northern Trust Corp Index funds	+30K +52.7%	88K	$1.2M
Panagora Asset Management Inc Active manager	+26K New position	26K	$337,039

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Nantahala Capital Management, LLC Hedge fund	+660K +100.0%	1.3M	$17.4M
Adage Capital Partners Gp, L.L.C. Hedge fund	+313K +136.9%	541K	$7.1M
Millennium Management LLC Hedge fund	+55K +86.2%	118K	$1.6M
Walleye Capital LLC Hedge fund	+54K New position	54K	$715,529
D. E. Shaw & Co., Inc. Hedge fund	+34K New position	34K	$450,927
AQR Capital Management LLC Hedge fund	+31K +11.7%	299K	$3.9M
Panagora Asset Management Inc Active manager	+26K New position	26K	$337,039
Price T Rowe Associates Inc Active manager	+18K New position	18K	$233,000
Two Sigma Investments, LP Hedge fund	+13K +7.6%	178K	$2.3M
Alliancebernstein L.P. Active manager	+12K New position	12K	$137,878

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Atlas Venture Life Science Advisors, LLC	−174K −15.3%	963K	$12.7M
Jane Street Group, LLC	−116K Sold out	0	—
Balyasny Asset Management L.P. Hedge fund	−88K −8.5%	952K	$12.5M
Trexquant Investment LP Hedge fund	−45K −79.6%	11K	$151,333
Acadian Asset Management LLC Active manager	−27K −65.4%	14K	$189,000
Renaissance Technologies LLC Hedge fund	−26K −18.9%	111K	$1.5M
Quadrature Capital Ltd Hedge fund	−20K Sold out	0	—
Morgan Stanley	−19K −45.3%	23K	$296,563
Marshall Wace, LLP Hedge fund	−15K −44.5%	19K	$251,211
Engineers Gate Manager LP Hedge fund	−13K −56.9%	10K	$134,660
Xtx Topco Ltd	−13K −20.9%	48K	$630,254
HRT Financial LP	−11K Sold out	0	—
Boothbay Fund Management, LLC Hedge fund	−6,147 −14.6%	36K	$472,543
Susquehanna Portfolio Strategies, LLC	−5,625 −29.4%	14K	$177,930
Algert Global LLC Hedge fund	−4,973 −25.9%	14K	$187,314
Essential Partners LLC	−1,142 −86.4%	180	$2,372
PNC Financial Services Group, Inc.	−637 −76.7%	193	$2,544
Mai Capital Management	−606 Sold out	0	—
Advisory Services Network, LLC	−245 Sold out	0	—
Versant Capital Management, Inc	−152 −22.0%	539	$7,104

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Balyasny Asset Management L.P. Hedge fund	−88K −8.5%	952K	$12.5M
Trexquant Investment LP Hedge fund	−45K −79.6%	11K	$151,333
Acadian Asset Management LLC Active manager	−27K −65.4%	14K	$189,000
Renaissance Technologies LLC Hedge fund	−26K −18.9%	111K	$1.5M
Quadrature Capital Ltd Hedge fund	−20K Sold out	0	—
Marshall Wace, LLP Hedge fund	−15K −44.5%	19K	$251,211
Engineers Gate Manager LP Hedge fund	−13K −56.9%	10K	$134,660
Boothbay Fund Management, LLC Hedge fund	−6,147 −14.6%	36K	$472,543
Algert Global LLC Hedge fund	−4,973 −25.9%	14K	$187,314

New positions

largest by value

Institution	Shares	Value June 30, 2026
Walleye Capital LLCHedge fund	54K	$715,529
Bank Of America Corp	52K	$681,498
D. E. Shaw & Co., Inc.Hedge fund	34K	$450,927
Jump Financial, LLC	34K	$446,881
Panagora Asset Management IncActive manager	26K	$337,039
Price T Rowe Associates IncActive manager	18K	$233,000
HSBC Holdings PLC	18K	$232,803
Nuveen, LLC	16K	$209,048
Mercer Global Advisors Inc	13K	$169,864
Wealth Enhancement Advisory Services, LLC	12K	$167,556

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Jane Street Group, LLC	116K	$1.3M
Quadrature Capital LtdHedge fund	20K	$230,430
HRT Financial LP	11K	$122,000
Mai Capital Management	606	$6,860
Advisory Services Network, LLC	245	$2,773
Keating Financial Advisory Services, Inc.	63	$713
Root Financial Partners, LLC	63	$713
Bare Financial Services, Inc	44	$498
Wealth Preservation Advisors, LLC	44	$498
Fortitude Family Office, LLC	39	$441

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 107
Ten largest holders: 64.2%
Index fund managers: 14.7%
Active managers and hedge funds: 32.1%

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	13	9	6	1	+989K	+25.6%
Index fund managers	9	0	0	0	+869K	+64.1%
Other institutions	45	21	13	10	+437K	+5.8%

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 Korro Bio.

Only managers that filed a holdings report for both quarters are compared (116 here). 4 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.

← Back to Korro Bio, Inc. · Insiders · Politicians