Balyasny group discloses 6.60% Korro Bio (KRRO) stake via Cayman funds

Rhea-AI Filing Summary

Korro Bio, Inc. has a significant shareholder group led by Balyasny Asset Management L.P. and related entities, which report beneficial ownership of 951,783 shares of Korro Bio common stock. This position represents approximately 6.60% of the outstanding common shares, based on 14,422,571 shares outstanding as of May 4, 2026.

The shares are held through two Cayman Islands investment vehicles: Atlas Diversified Master Fund, Ltd. with 411,729 shares and Atlas Private Holdings (Cayman) Ltd with 540,054 shares. Each reporting person, including Balyasny Asset Management L.P., BAM GP LLC, Balyasny Asset Management Holdings LP, Dames GP LLC, and Dmitry Balyasny, is deemed to have sole voting and dispositive power over the full 951,783 shares and no shared power.

Key Figures

Beneficially owned shares: 951,783 shares Ownership percentage: 6.60% Shares outstanding: 14,422,571 shares +2 more

5 metrics

Beneficially owned shares 951,783 shares Shares of Korro Bio common stock beneficially owned by the reporting persons

Ownership percentage 6.60% Approximate percent of Korro Bio common stock class beneficially owned

Shares outstanding 14,422,571 shares Korro Bio common stock outstanding as of May 4, 2026

ADMF holdings 411,729 shares Shares held by Atlas Diversified Master Fund, Ltd.

APHC holdings 540,054 shares Shares held by Atlas Private Holdings (Cayman) Ltd

Key Terms

beneficial owner, sole voting power, dispositive power, Schedule 13G/A, +1 more

5 terms

beneficial owner financial

"Each of the Reporting Persons may be deemed to be the beneficial owner of approximately 6.60%"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

sole voting power financial

"Each of the Reporting Persons has the sole power to vote or to direct the vote of 951783 shares."

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

dispositive power financial

"sole power to dispose or to direct the disposition of 951783 shares."

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Schedule 13G/A regulatory

"form_type": "SCHEDULE 13G/A"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

investment manager financial

"by virtue of its position as the investment manager of Atlas Diversified Master Fund, Ltd."

FAQ

What percentage of Korro Bio (KRRO) does Balyasny Asset Management report owning?

Balyasny-related entities report beneficial ownership of approximately 6.60% of Korro Bio’s common stock, based on 14,422,571 shares outstanding as of May 4, 2026, as cited from the issuer’s Form 10-Q.

How many Korro Bio (KRRO) shares are beneficially owned by the Balyasny group?

The reporting persons collectively report beneficial ownership of 951,783 shares of Korro Bio common stock, held through two Cayman Islands investment vehicles for which Balyasny Asset Management L.P. acts as investment manager.

Which entities hold the Korro Bio (KRRO) shares for Balyasny Asset Management?

The shares are held by Atlas Diversified Master Fund, Ltd. with 411,729 shares and Atlas Private Holdings (Cayman) Ltd with 540,054 shares, both described as Cayman Islands exempted companies and investment management clients of Balyasny Asset Management L.P.

What voting power do the Balyasny reporting persons have over Korro Bio (KRRO) shares?

Each reporting person is stated to have sole power to vote or direct the vote of 951,783 shares and no shared voting power, as well as sole dispositive power over the same number of shares.

Who are the reporting persons in the Korro Bio (KRRO) Schedule 13G/A?

The reporting persons are Balyasny Asset Management L.P., BAM GP LLC, Balyasny Asset Management Holdings LP, Dames GP LLC, and Dmitry Balyasny, who are linked through general partner and managing member relationships.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/14/2026 - 06:09 AM Accepted by SEC EDGAR 08/14/2026 - 06:04 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Korro Bio, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

500946108

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 500946108

1

Names of Reporting Persons

BALYASNY ASSET MANAGEMENT L.P.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 951,783.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 951,783.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

951,783.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.60 %

12

Type of Reporting Person (See Instructions)

IA, PN

SCHEDULE 13G

CUSIP Number(s): 500946108

1

Names of Reporting Persons

BAM GP LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 951,783.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 951,783.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

951,783.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.60 %

12

Type of Reporting Person (See Instructions)

HC, OO

SCHEDULE 13G

CUSIP Number(s): 500946108

1

Names of Reporting Persons

Balyasny Asset Management Holdings LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 951,783.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 951,783.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

951,783.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.60 %

12

Type of Reporting Person (See Instructions)

HC, PN

SCHEDULE 13G

CUSIP Number(s): 500946108

1

Names of Reporting Persons

Dames GP LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 951,783.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 951,783.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

951,783.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.60 %

12

Type of Reporting Person (See Instructions)

HC, OO

SCHEDULE 13G

CUSIP Number(s): 500946108

1

Names of Reporting Persons

Dmitry Balyasny

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 951,783.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 951,783.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

951,783.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.60 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Korro Bio, Inc.
(b)	Address of issuer's principal executive offices: 60 First Street, 2nd Floor, Suite 250, Cambridge, MA, 02141
Item 2.
(a)	Name of person filing: This statement is being filed by (1) Balyasny Asset Management L.P., a Delaware limited partnership ("BAM"), (2) BAM GP LLC, a Delaware limited liability company ("BAM GP"), (3) Balyasny Asset Management Holdings LP, a Delaware limited partnership ("BAM Holdings"), (4) Dames GP LLC, a Delaware limited liability company ("Dames"), and (5) Dmitry Balyasny, a United States citizen (collectively, the "Reporting Persons"). BAM GP is the General Partner of BAM. BAM Holdings is the Sole Member of BAM GP. Dames is the General Partner of BAM Holdings. Dmitry Balyasny is the Managing Member of Dames.
(b)	Address or principal business office or, if none, residence: The principal business address of each of BAM, BAM GP, BAM Holdings, Dames, and Mr. Balyasny is located at 444 West Lake Street, 50th Floor, Chicago, IL 60606.
(c)	Citizenship: (1) BAM is a Delaware limited partnership, (2) BAM GP is a Delaware limited liability company, (3) BAM Holdings is a Delaware limited partnership, (4) Dames is a Delaware limited liability company, and (5) Mr. Balyasny is a United States citizen.
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 500946108
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: By virtue of its position as the investment manager of Atlas Diversified Master Fund, Ltd. ("ADMF"), the direct holder of 411,729 shares of common stock, par value $0.001 per share ("Shares"), reported herein, and by virtue of its position as the invetsment manager of Atlas Private Holdings (Cayman) Ltd ("APHC"), the direct holder of 540,054 Shares, BAM may be deemed to exercise voting and investment power over such Shares held by ADMF and APHC and thus may be deemed to beneficially own such Shares. By virtue of its position as the General Partner of BAM, BAM GP may be deemed to exercise voting and investment power over the Shares held directly by ADMF and APHC and thus may be deemed to beneficially own such Shares. By virtue of its position as the Sole Member of BAM GP, BAM Holdings may be deemed to exercise voting and investment power over the Shares held directly by ADMF and APHC and thus may be deemed to beneficially own such Shares. By virtue of its position as the General Partner of BAM Holdings, Dames may be deemed to exercise voting and investment power over the Shares held directly by ADMF and APHC and thus may be deemed to beneficially own such Shares. By virtue of his position as the Managing Member of Dames, Mr. Balyasny may be deemed to exercise voting and investment power over the Shares held directly by ADMF and APHC and thus may be deemed to beneficially own such Shares.
(b)	Percent of class: Each of the Reporting Persons may be deemed to be the beneficial owner of approximately 6.60% of the Shares, based on 14,422,571 Shares of common stock outstanding as of May 4, 2026 as reported in the Issuer's Form 10-Q as filed with the Securities Exchange Commision on May 7, 2026.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Each of the Reporting Persons has the sole power to vote or to direct the vote of 951783 shares.
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: Each of the Reporting Persons has the sole power to dispose or to direct the disposition of 951783 shares.
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. ADMF and APHC, are both Cayman Islands exempted companies that are investment management clients of BAM, have the right to receive dividends from, or the proceeds from the sale of, the reported securities.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

BALYASNY ASSET MANAGEMENT L.P.

Signature:	/s/ Scott Schroeder
Name/Title:	Scott Schroeder / Authorized Signatory
Date:	08/14/2026

BAM GP LLC

Signature:	/s/ Scott Schroeder
Name/Title:	Scott Schroeder / Authorized Signatory
Date:	08/14/2026

Balyasny Asset Management Holdings LP

Signature:	/s/ Scott Schroeder
Name/Title:	Scott Schroeder / Authorized Signatory
Date:	08/14/2026

Dames GP LLC

Signature:	/s/ Scott Schroeder
Name/Title:	Scott Schroeder / Authorized Signatory
Date:	08/14/2026

Dmitry Balyasny

Signature:	/s/ Dmitry Balyasny
Name/Title:	Dmitry Balyasny / Self
Date:	08/14/2026