KRRO · Korro Bio, Inc.

$13.06 -0.13 (-0.95%) At close · Aug 24

Market Cap

$194.53M

14.73M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Quarter:

Holders: 107

Total Value: $191,856,179

Total Shares: 14,556,620

Institutional Ownership Trend

11 quarters

Holder Concentration

Across 107 13F filers · Δ vs Mar 31, 2026

Top Holder

10.6%

−1.0 pts

Top 5

39.6%

−5.8 pts

Top 10

62.0%

−4.5 pts

HHI

495

Broadly held−71

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +7

Institutional value: +27.6%

Shares held: +9.6%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mega BlackRock, Inc.	+357,615	817,621
Large ADAGE CAPITAL PARTNERS GP, L.L.C.	+312,568	540,968
Small Kalehua Capital Management LLC	+295,664	405,040
Mega VANGUARD CAPITAL MANAGEMENT LLC	+143,865	454,778
Mega GEODE CAPITAL MANAGEMENT, LLC	+123,227	296,870

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Small Atlas Venture Life Science Advisors, LLC	−174,265	962,884
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	−156,800	47,300
Mega CITADEL ADVISORS LLC	−145,324	123,790
Large Balyasny Asset Management L.P.	−88,271	951,783
Large Trexquant Investment LP	−44,726	11,482

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Large Walleye Capital LLC	54,289	$715,529
Mega BANK OF AMERICA CORP /DE/	51,707	$681,498
Mega D. E. Shaw & Co., Inc.	34,213	$450,927
Mid Jump Financial, LLC	33,906	$446,881
Large PANAGORA ASSET MANAGEMENT INC	25,572	$337,038

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Mega JANE STREET GROUP, LLC	158,504	$1,794,264
Large Quadrature Capital Ltd	20,356	$230,429
Large HRT FINANCIAL LP	10,790	$122,142
Large CWM, LLC	9,772	$110,619
Large MAI Capital Management	606	$6,859

Filter: New 20 Increased 46 Reduced 21 Sold out 13 Unchanged 20

Showing 100 of 110

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

Lynx1 Capital Management LP

$20,274,741

10.57%

1,538,296

NEA Management Company, LLC

$17,106,229

8.92%

1,297,893

Venrock Adviser, LLC

$13,305,210

6.93%

1,009,500

Atlas Venture Life Science Advisors, LLC

$12,690,811

6.61%

962,884

Balyasny Asset Management L.P.

$12,544,499

6.54%

951,783

BlackRock, Inc.

$10,776,240

5.62%

817,621

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	50,716	$668,436	6.2%	Sole
BlackRock Asset Management Canada Ltd	85	$1,120	0.0%	Sole
BlackRock Investment Management, LLC	31,920	$420,705	3.9%	Sole
BLACKROCK ADVISORS LLC	23,712	$312,524	2.9%	Sole
BlackRock Fund Advisors	458,680	$6,045,402	56.1%	Sole
BlackRock Institutional Trust Company, N.A.	250,493	$3,301,497	30.6%	Sole
BlackRock Japan Co. Ltd	1,193	$15,723	0.1%	Sole
BlackRock Investment Management (UK) Ltd.	724	$9,542	0.1%	Sole
BlackRock (Netherlands) B.V.	95	$1,252	0.0%	Sole
Aperio Group, LLC	3	$39	0.0%	Sole

Affinity Asset Advisors, LLC

$9,316,994

4.86%

706,904

Nantahala Capital Management, LLC

$8,699,274

4.53%

660,036

ADAGE CAPITAL PARTNERS GP, L.L.C.

$7,129,958

3.72%

540,968

ADAR1 Capital Management, LLC

$7,117,911

3.71%

540,054

VANGUARD CAPITAL MANAGEMENT LLC

$5,993,974

3.12%

454,778

Driehaus Capital Management LLC

$5,931,593

3.09%

450,045

TCG Crossover Management, LLC

$5,486,847

2.86%

416,301

Kalehua Capital Management LLC

$5,338,427

2.78%

405,040

Siren, L.L.C.

$4,582,923

2.39%

347,718

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Invus Group, LLC	347,718	$4,582,923	100.0%	Defined

AQR CAPITAL MANAGEMENT LLC

$3,940,471

2.05%

298,974

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Petros Family Wealth, LLC	11	$144	0.0%	Other
KEB ASSET MANAGEMENT, LLC	22	$289	0.0%	Other
RF&L WEALTH MANAGEMENT, LLC	16	$210	0.0%	Other
Prism Planning Partners LLC	133	$1,752	0.0%	Other
Arax Advisory Partners	5,453	$71,870	1.8%	Other
HALBERT HARGROVE GLOBAL ADVISORS, LLC	1,726	$22,748	0.6%	Other
Stokes Family Office, LLC	586	$7,723	0.2%	Other
Held directly	291,027	$3,835,735	97.3%	Defined

GEODE CAPITAL MANAGEMENT, LLC

$3,912,745

2.04%

296,870

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	47,811	$630,148	16.1%	Defined
Held directly	249,059	$3,282,597	83.9%	Defined

72 Investment Holdings, LLC

$3,648,632

1.90%

276,831

STATE STREET CORP

$3,065,496

1.60%

232,587

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS EUROPE LIMITED joint	232,587	$3,065,496	100.0%	Defined

VANGUARD PORTFOLIO MANAGEMENT LLC

$2,946,402

1.54%

223,551

TWO SIGMA INVESTMENTS, LP

$2,346,975

1.22%

178,071

JPMORGAN CHASE & CO

$1,643,887

0.86%

124,726

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JPMorgan Chase Bank, N.A.	4,619	$60,878	3.7%	Defined
J.P. Morgan Investment Management Inc.	10	$131	0.0%	Defined
J.P. Morgan Securities LLC	120,097	$1,582,878	96.3%	Defined

MILLENNIUM MANAGEMENT LLC

$1,560,960

0.81%

118,434

GOLDMAN SACHS GROUP INC

$1,541,835

0.80%

116,983

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	116,983	$1,541,835	100.0%	Defined

RENAISSANCE TECHNOLOGIES LLC

$1,456,706

0.76%

110,524

UBS Group AG

$1,389,869

0.72%

105,453

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Financial Services Inc	6	$79	0.0%	Defined
UBS AG	102,709	$1,353,704	97.4%	Defined
UBS Switzerland AG	1,960	$25,832	1.9%	Defined
UBS Securities LLC	778	$10,254	0.7%	Defined

NORTHERN TRUST CORP

$1,161,011

0.61%

88,089

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	86,345	$1,138,026	98.0%	Defined
DWS INVESTMENT MANAGEMENT AMERICAS, INC joint	1,744	$22,985	2.0%	Other

VANGUARD FIDUCIARY TRUST CO

$987,195

0.51%

74,901

CITADEL ADVISORS LLC

$935,780

0.49%

71,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	71,000	$935,780	100.0%	Defined

EMERALD MUTUAL FUND ADVISERS TRUST

$837,747

0.44%

63,562

F/m Investments LLC

$837,747

0.44%

63,562

Walleye Capital LLC

$715,529

0.37%

54,289

Quantinno Capital Management LP

$694,849

0.36%

52,720

BANK OF AMERICA CORP /DE/

$681,498

0.36%

51,707

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	51,707	$681,498	100.0%	Defined

RAYMOND JAMES FINANCIAL INC

$644,765

0.34%

48,920

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RAYMOND JAMES & ASSOCIATES	8,040	$105,967	16.4%	Defined
Raymond James Financial Services Advisors, Inc.	40,880	$538,798	83.6%	Defined

XTX Topco Ltd

$630,254

0.33%

47,819

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	47,819	$630,254	100.0%	Defined

CITADEL ADVISORS LLC

$532,339

0.28%

40,390

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	40,054	$527,911	99.2%	Defined
Held directly	336	$4,428	0.8%	Defined

FMR LLC

$513,690

0.27%

38,975

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	38,975	$513,690	100.0%	Defined

BOOTHBAY FUND MANAGEMENT, LLC

$472,542

0.25%

35,853

D. E. Shaw & Co., Inc.

$450,927

0.24%

34,213

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
D. E. SHAW & CO, L.P.	34,213	$450,927	100.0%	Defined

Jump Financial, LLC

$446,881

0.23%

33,906

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Leap GP LLC joint	33,906	$446,881	100.0%	Defined

Bank of New York Mellon Corp

$418,200

0.22%

31,730

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Investments Corporation	11,835	$155,985	37.3%	Defined
The Bank of New York Mellon	17,519	$230,900	55.2%	Defined
BNY Mellon, NA joint	2,375	$31,302	7.5%	Defined
Held directly	1	$13	0.0%	Defined

AIHC Capital Management Ltd

$398,892

0.21%

30,265

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$383,538

0.20%

29,100

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	29,100	$383,538	100.0%	Other

Mariner, LLC

$367,827

0.19%

27,908

BNP PARIBAS ARBITRAGE, SA

$346,027

0.18%

26,254

PANAGORA ASSET MANAGEMENT INC

$337,038

0.18%

25,572

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$317,769

0.17%

24,110

MORGAN STANLEY

$296,561

0.15%

22,501

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	5	$65	0.0%	Defined
MORGAN STANLEY & CO. LLC	5,918	$77,999	26.3%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	16,123	$212,501	71.7%	Defined
MORGAN STANLEY SMITH BARNEY LLC	220	$2,899	1.0%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	235	$3,097	1.0%	Defined

IEQ CAPITAL, LLC

$280,022

0.15%

21,246

MARSHALL WACE, LLP

$251,210

0.13%

19,060

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Marshall Wace North America L.P. joint	19,060	$251,210	100.0%	Other

GUGGENHEIM CAPITAL LLC

$242,511

0.13%

18,400

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GUGGENHEIM FUNDS DISTRIBUTORS, LLC	18,290	$241,062	99.4%	Defined
SECURITY INVESTORS LLC	107	$1,410	0.6%	Defined
Guggenheim Partners Investment Management, LLC joint	3	$39	0.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$239,876

0.13%

18,200

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	18,200	$239,876	100.0%	Other

HSBC HOLDINGS PLC

$234,762

0.12%

17,812

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
HSBC BANK PLC	17,812	$234,762	100.0%	Defined

PRICE T ROWE ASSOCIATES INC /MD/

$232,416

0.12%

17,634

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
T. Rowe Price International Ltd	17,634	$232,416	100.0%	Defined

DEUTSCHE BANK AG\

$210,194

0.11%

15,948

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
DWS INVESTMENT MANAGEMENT AMERICAS, INC	5,068	$66,796	31.8%	Defined
DWS Investments UK Ltd	10,880	$143,398	68.2%	Defined

Nuveen, LLC

$209,047

0.11%

15,861

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Nuveen Asset Management, LLC joint	981	$12,929	6.2%	Defined
TEACHERS ADVISORS, LLC joint	14,880	$196,118	93.8%	Defined

ACADIAN ASSET MANAGEMENT LLC

$190,846

0.10%

14,480

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Acadian Inc	14,480	$190,846	100.0%	Defined

ALGERT GLOBAL LLC

$187,314

0.10%

14,212

Susquehanna Portfolio Strategies, LLC

$177,930

0.09%

13,500

MERCER GLOBAL ADVISORS INC /ADV

$169,863

0.09%

12,888

RHUMBLINE ADVISERS

$163,445

0.09%

12,401

CITADEL ADVISORS LLC

$163,432

0.09%

12,400

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	12,400	$163,432	100.0%	Defined

ALLIANCEBERNSTEIN L.P.

$160,532

0.08%

12,180

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Equitable Holdings, Inc.	12,180	$160,532	100.0%	Defined

WEALTH ENHANCEMENT ADVISORY SERVICES, LLC

$151,675

0.08%

11,508

Trexquant Investment LP

$151,332

0.08%

11,482

DIMENSIONAL FUND ADVISORS LP

$150,330

0.08%

11,406

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Ireland Ltd	130	$1,713	1.1%	Defined
Held directly	11,276	$148,617	98.9%	Sole

Cerity Partners LLC

$142,264

0.07%

10,794

Engineers Gate Manager LP

$134,660

0.07%

10,217

AMERICAN CENTURY COMPANIES INC

$133,816

0.07%

10,153

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
AMERICAN CENTURY INVESTMENT MANAGEMENT INC	10,153	$133,816	100.0%	Defined

WELLS FARGO & COMPANY/MN

$126,052

0.07%

9,564

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO BANK N A	9,482	$124,972	99.1%	Defined
WELLS FARGO ADVISORS FINANCIAL NETWORK, LLC	69	$909	0.7%	Defined
WELLS FARGO CLEARING SERVICES, LLC	13	$171	0.1%	Defined

Arax Advisory Partners

$73,742

0.04%

5,595

CITIGROUP INC

$68,126

0.04%

5,169

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	5,169	$68,126	100.0%	Defined

MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.

$67,613

0.04%

5,130

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Global X Management CO LLC joint	5,130	$67,613	100.0%	Defined

Russell Investments Group, Ltd.

$65,095

0.03%

4,939

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Russell Investment Management, LLC	4,939	$65,095	100.0%	Defined

Police & Firemen's Retirement System of New Jersey

$60,983

0.03%

4,627

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Capital	4,627	$60,983	100.0%	Defined

NEW YORK STATE COMMON RETIREMENT FUND

$39,540

0.02%

3,000

SIMPLEX TRADING, LLC

$26,030

0.01%

1,975

Vanguard Global Advisers, LLC

$25,424

0.01%

1,929

North Star Investment Management Corp.

$23,724

0.01%

1,800

Tower Research Capital LLC (TRC)

$20,916

0.01%

1,587

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	1,587	$20,916	100.0%	Defined

Integrated Wealth Concepts LLC

$20,890

0.01%

1,585

Legal & General Group Plc

$14,260

0.01%

1,082

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Legal & General Investment Management America Inc	1,082	$14,260	100.0%	Defined

GAMMA Investing LLC

$11,347

0.01%

861

TD Waterhouse Canada Inc.

$10,649

0.01%

808

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
TORONTO DOMINION BANK	808	$10,649	100.0%	Defined

Ameritas Investment Partners, Inc.

$7,881

0.00%

598

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
EATON VANCE MANAGEMENT	598	$7,881	100.0%	Other

Versant Capital Management, Inc

$7,104

0.00%

539

Allworth Financial LP

$7,090

0.00%

538

EverSource Wealth Advisors, LLC

$6,561

0.00%

498

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BMSS Wesson Wealth Solutions, LLC	4	$52	0.8%	Sole
Held directly	494	$6,509	99.2%	Sole

DUNCKER STREETT & CO INC

$5,759

0.00%

437

IFP Advisors, Inc

$5,509

0.00%

418

ROYAL BANK OF CANADA

$4,639

0.00%

352

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC CMA LTD.	334	$4,402	94.9%	Defined
RBC Dominion Securities Inc.	18	$237	5.1%	Defined

UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC

$2,965

0.00%

225

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Group AG	225	$2,965	100.0%	Defined

PNC FINANCIAL SERVICES GROUP, INC.

$2,543

0.00%

193

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PNC Bank, National Association	193	$2,543	100.0%	Defined

True Wealth Design, LLC

$2,530

0.00%

192

Sterling Capital Management LLC

$2,517

0.00%

191

Essential Partners LLC

$2,372

0.00%

180

OSAIC HOLDINGS, INC.

$1,765

0.00%

134

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	130	$1,713	97.1%	Defined
Osaic Advisory Services, LLC	4	$52	2.9%	Defined

ROTHSCHILD INVESTMENT LLC

$1,621

0.00%

123

Farther Finance Advisors, LLC

$1,515

0.00%

115

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Optiver VOF	60	$790	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	102,642	$1,161,907	88.7%	Defined
Jane Street Global Trading, LLC	13,062	$147,861	11.3%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	42,800	$484,496	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Quadrature US Inc.	20,356	$230,429	100.0%	Other

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fifth Third Bank, National Association	11	$124	100.0%	Defined

Key facts CIK 1703647 CUSIP 500946108 13F (30d) 102 filings 97 filers Visit website Investor relations