Korro Bio, Inc.

KRRO

Exchange: Nasdaq
Industry: Pharmaceutical Preparations
SEC CIK: 0001703647

SEC filings (opens in a new tab)

In the last 90 days, Korro Bio, Inc. insiders filed 1 open-market purchase and 7 sales; 106 institutions reported holding it in 13F filings for Q2 2026, worth $190.1M in total; no superinvestor holds it.

Q1 2026 vs. Q4 2025

How the institutions holding Korro Bio, Inc. changed between Q4 2025 and Q1 2026.

All holders in Q1 2026 All holders in Q4 2025

13F holders of KRRO: Q4 2025 compared with Q1 2026
Measure	Q4 2025	Of which not filed for Q1 2026	Q1 2026	Change
Holders	83	2	99	+18
Shares	7.56M	489.7K	12.8M	+5.73M (+81.0%)
Value	$60.6M	$3.92M	$144.8M	+$88.2M (+155.7%)

2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so the changes leave them out.

New holders (33)

Institutions that held Korro Bio, Inc. at the end of Q1 2026 but not at the end of Q4 2025.

Institutions new to KRRO in Q1 2026
Institution	Shares	Value	% of portfolio
Balyasny Asset Management LLC	1,040,054	$11.8M	0.02%
VR Adviser, LLC	1,009,500	$11.4M	0.43%
Affinity Asset Advisors, LLC	706,904	$8.00M	0.47%
ADAR1 Capital Management, LLC	540,054	$6.11M	0.37%
Driehaus Capital Management LLC	450,045	$5.09M	0.04%
Vanguard Capital Management LLC	310,913	$3.52M	0.00%
Adage Capital Partners GP, L.L.C.	228,400	$2.59M	0.00%
Vanguard Portfolio Management LLC	148,559	$1.68M	0.00%
Kalehua Capital Management LLC	109,376	$1.24M	0.88%
Trexquant Investment LP	56,208	$636.3K	0.00%
Boothbay Fund Management, LLC	42,000	$475.4K	0.01%
Vanguard Fiduciary Trust Co	41,541	$470.2K	0.00%
Mariner, LLC	25,819	$292.1K	0.00%
Susquehanna Portfolio Strategies, LLC	19,125	$216.5K	0.00%
Ieq Capital, LLC	12,777	$144.6K	0.00%
HRT Financial LP	10,790	$122.0K	0.00%
Vanguard Global Advisers, LLC	1,929	$21.8K	0.00%
Essential Partners LLC	1,322	$15.0K	0.01%
Versant Capital Management, Inc	691	$7.82K	0.00%
EverSource Wealth Advisors, LLC	379	$4.29K	0.00%
Advisory Services Network, LLC	245	$2.77K	0.00%
True Wealth Design, LLC	99	$1.12K	0.00%
SRS Capital Advisors, Inc.	86	$974	0.00%
Root Financial Partners, LLC	63	$713	0.00%
Farther Finance Advisors, LLC	54	$683	0.00%
Wealth Preservation Advisors, LLC	44	$498	0.00%
Bare Financial Services, Inc	44	$498	0.00%
Nisa Investment Advisors, LLC	40	$453	0.00%
Fortitude Family Office, LLC	39	$441	0.00%
Basecamp Wealth Advisors LLC	25	$283	0.00%
SJS Investment Consulting Inc.	22	$250	0.00%
Fifth Third Bancorp	11	$125	0.00%
JPL Wealth Management, LLC	2	$23	0.00%

Sold out (15)

Institutions that held Korro Bio, Inc. at the end of Q4 2025 and filed for Q1 2026 without it.

Institutions that sold out of KRRO in Q1 2026
Institution	Shares, Q4 2025	Value, Q4 2025
Susquehanna International Group, LLP	196,827	$1.58M
Graham Capital Management, L.P.	40,766	$326.5K
Simplex Trading, LLC	28,247	$226.3K
Two Sigma Advisers, LP	11,237	$90.0K
American Century Companies Inc	10,590	$84.8K
Jain Global LLC	10,574	$84.7K
Quest Partners LLC	7,703	$61.7K
Bank of America Corp	5,896	$47.2K
Group One Trading, L.P.	4,000	$32.0K
Steward Partners Investment Advisory, LLC	1,500	$12.0K
California State Teachers Retirement System	408	$3.27K
Federated Hermes, Inc.	302	$2.42K
Amalgamated Bank	208	$2.00K
Northwestern Mutual Wealth Management Co	2	$16
Los Angeles Capital Management LLC	110	–

Not filed for Q1 2026 yet (2)

Institutions that held Korro Bio, Inc. at the end of Q4 2025 and haven't filed a 13F for Q1 2026. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding KRRO in Q4 2025 that haven't filed for Q1 2026
Institution	Shares, Q4 2025	Value, Q4 2025
Vanguard Group Inc	489,639	$3.92M
Global Retirement Partners, LLC	35	$280