BlackRock, Inc. (KRRO) discloses 5.2% beneficial ownership in Korro Bio common stock

Rhea-AI Filing Summary

BlackRock, Inc. reports beneficial ownership of common stock of Korro Bio, Inc. as an institutional holder. BlackRock reports beneficial ownership of 747,546 shares of Korro Bio common stock, representing 5.2% of the class. It has sole voting power over 738,098 shares and sole dispositive power over 747,546 shares, with no shared voting or dispositive power reported. Various underlying clients or accounts have economic rights to dividends or sale proceeds, but no single person has more than five percent of Korro Bio’s outstanding common shares.

Key Figures

Beneficial ownership: 747,546 shares Percent of class: 5.2% Sole voting power: 738,098 shares +2 more

5 metrics

Beneficial ownership 747,546 shares Common stock of Korro Bio, Inc. reported by BlackRock, Inc.

Percent of class 5.2% Portion of Korro Bio common stock beneficially owned by BlackRock

Sole voting power 738,098 shares Shares of Korro Bio common stock over which BlackRock has sole voting power

Sole dispositive power 747,546 shares Shares of Korro Bio common stock over which BlackRock has sole dispositive power

Shared voting power 0 shares Korro Bio shares where voting power is shared by BlackRock

Key Terms

beneficially owned, Sole Voting Power, Sole Dispositive Power, percent of class, +1 more

5 terms

beneficially owned financial

"reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Sole Voting Power financial

"5 | Sole Voting Power 738,098.00 6 | Shared Voting Power 0.00"

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.

Sole Dispositive Power financial

"7 | Sole Dispositive Power 747,546.00 8 | Shared Dispositive Power 0.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

percent of class financial

"(b) | Percent of class: 5.2 %"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

Power of Attorney regulatory

"Exhibit 24: Power of Attorney Exhibit 99: Item 7"

A power of attorney is a legal document that allows one person to make decisions and act on behalf of another person, often in financial or legal matters. It’s like giving someone a trusted helper or agent the authority to handle important tasks if you are unable to do so yourself. This matters to investors because it can impact how their assets are managed or transferred if they become unable to oversee their affairs.

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

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Available on EDGAR 07/29/2026 - 03:21 PM Accepted by SEC EDGAR 07/29/2026 - 03:19 PM Learn about SEC filing dates

FAQ

What percentage of Korro Bio, Inc. (KRRO) shares does BlackRock, Inc. report owning?

BlackRock reports beneficial ownership of 5.2% of Korro Bio’s common stock. This corresponds to 747,546 shares, making BlackRock a significant institutional holder crossing the five percent reporting threshold under Schedule 13G rules.

How many Korro Bio (KRRO) shares does BlackRock, Inc. have voting power over?

BlackRock reports sole voting power over 738,098 Korro Bio common shares. It reports no shared voting power, meaning all reported voting authority for these securities is held on a sole basis by BlackRock’s reporting business units.

What is the difference between BlackRock’s voting and dispositive power in Korro Bio (KRRO) shares?

BlackRock has sole voting power over 738,098 shares and sole dispositive power over 747,546 shares. It reports no shared power for either category, indicating exclusive authority to direct voting and disposition for the reported positions.

Does any single client of BlackRock own more than 5% of Korro Bio (KRRO)?

No. The filing states that various persons have rights to dividends or sale proceeds from Korro Bio shares managed by BlackRock, but that no one person’s interest exceeds five percent of Korro Bio’s total outstanding common shares.

Which entity is the reporting person for this Korro Bio (KRRO) ownership disclosure?

The reporting person is BlackRock, Inc., a Delaware corporation, filing on behalf of certain consolidated Reporting Business Units. It excludes any disaggregated business units whose holdings are reported separately under SEC Release No. 34-39538.

Who signed the BlackRock ownership report for Korro Bio (KRRO)?

The report is signed by Spencer Fleming, identified as a Managing Director of BlackRock, Inc. The signature is supported by a Power of Attorney referenced as Exhibit 24 in the filing exhibits.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

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

BlackRock, Inc.

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 738,098.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 747,546.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

747,546.00

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)

5.2 %

12

Type of Reporting Person (See Instructions)

HC

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: BlackRock, Inc. In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 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: 747546
(b)	Percent of class: 5.2 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 738098
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 747546
	(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. Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of Korro Bio, Inc.. No one person's interest in the common stock of Korro Bio, Inc. is more than five percent of the total outstanding common shares.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99
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.

BlackRock, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	07/29/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7