| 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, MASSACHUSETTS, 02141 |
| Item 2. | |
| (a) | Name of person filing:
This Schedule 13G is being jointly filed by Citadel Advisors LLC ("Citadel Advisors"), Citadel Advisors Holdings LP ("CAH"), Citadel GP LLC ("CGP"), Citadel Securities LLC ("Citadel Securities"), Citadel Securities Group LP ("CALC4"), Citadel Securities GP LLC ("CSGP") and Mr. Kenneth Griffin (collectively with Citadel Advisors, CAH, CGP, Citadel Securities, CALC4 and CSGP, the "Reporting Persons") with respect to the Shares of the above-named issuer owned by Citadel Multi-Strategy Equities Master Fund Ltd., a Cayman Islands company ("CM"), and Citadel CEMF Investments Ltd., a Cayman Islands limited company ("CCIL"). Such owned Shares may include other instruments exercisable for or convertible into Shares.
Citadel Advisors is the portfolio manager for CM and CCIL. CAH is the sole member of Citadel Advisors. CGP is the general partner of CAH. CSGP is the general partner of CALC4. Mr. Griffin is the President and Chief Executive Officer of CGP, and owns a controlling interest in CGP and CSGP.
The filing of this statement shall not be construed as an admission that any of the Reporting Persons is the beneficial owner of any securities covered by the statement other than the securities actually owned by such person (if any). |
| (b) | Address or principal business office or, if
none, residence:
The address of each of the Reporting Persons is Southeast Financial Center, 200 S. Biscayne Blvd., Suite 3300, Miami, Florida 33131. |
| (c) | Citizenship:
Each of Citadel Advisors, CGP, Citadel Securities and CSGP is organized as a limited liability company under the laws of the State of Delaware. Each of CALC4 and CAH is organized as a limited partnership under the laws of the State of Delaware. Mr. Griffin is a U.S. citizen. |
| (d) | Title of class of securities:
Common Stock, par value $0.001 per share (the "Shares") |
| (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:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC may be deemed to beneficially own 369,733 Shares.
2. Citadel Securities LLC may be deemed to beneficially own 0 Shares.
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own 0 Shares.
4. Mr. Griffin may be deemed to beneficially own 369,733 Shares. |
| (b) | Percent of class:
1. The number of Shares that each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC may be deemed to beneficially own constitutes 3.9% of the Shares outstanding.
2. The number of Shares that Citadel Securities LLC may be deemed to beneficially own constitutes 0.0% of the Shares outstanding.
3. The number of Shares that each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own constitutes 0.0% of the Shares outstanding.
4. The number of Shares that Mr. Griffin may be deemed to beneficially own constitutes 3.9% of the Shares outstanding. % |
| (c) | Number of shares as to which the person has:
|
| | (i) Sole power to vote or to direct the vote:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 0
2. Citadel Securities LLC: 0
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0
4. Mr. Griffin: 0
|
| | (ii) Shared power to vote or to direct the
vote:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 369,733
2. Citadel Securities LLC: 0
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0
4. Mr. Griffin: 369,733
|
| | (iii) Sole power to dispose or to direct the
disposition of:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 0
2. Citadel Securities LLC: 0
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0
4. Mr. Griffin: 0
|
| | (iv) Shared power to dispose or to direct the
disposition of:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 369,733
2. Citadel Securities LLC: 0
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0
4. Mr. Griffin: 369,733
|
| Item 5. | Ownership of 5 Percent or Less of a Class. |
| | 
Ownership of 5 percent or less of a class |
| Item 6. | Ownership of more than 5 Percent on Behalf of
Another Person. |
| |
Not Applicable
|
| 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
|
