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  4. [Form 3] Korro Bio, Inc. Initial Statement of Beneficial Ownership

Fund linked to Korro Bio (KRRO) reports 1.54M shares on Form 3

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
3

Rhea-AI Filing Summary

Korro Bio, Inc. reported an initial insider ownership filing showing that investment entities associated with Lynx1 Capital Management LP and Weston Nichols indirectly hold 1,537,776 shares of common stock. The shares are held by Lynx1 Master Fund LP, and both the investment manager and Mr. Nichols disclaim beneficial ownership except for any pecuniary interest.

Positive

  • None.

Negative

  • None.
Insider Lynx1 Capital Management LP, Nichols Weston
Role 10% Owner | 10% Owner
Type Security Shares Price Value
holding Common stock, $0.001 par value per share -- -- --
Holdings After Transaction: Common stock, $0.001 par value per share — 1,537,776 shares (Indirect, See footnote)
Footnotes (1)
  1. [object Object]
Indirectly held common shares 1,537,776 shares Common stock, $0.001 par value per share, indirect ownership
Reporting status Ten percent owner Both Lynx1 Capital Management LP and Weston Nichols flagged as >10% owners
ten percent owner regulatory
"is_ten_percent_owner": 1"
indirect financial
""ownership_type": "indirect""
beneficial ownership regulatory
"disclaims beneficial ownership of the securities to which this filing relates"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
pecuniary interest financial
"except to the extent of his or its pecuniary interest therein"
Section 16 regulatory
"for purposes of Section 16 of the Securities and Exchange Act of 1934"
Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.
Understanding Insider Trading Forms →
SEC Form 3
FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0104
Estimated average burden
hours per response:0.5
1. Name and Address of Reporting Person*
Lynx1 Capital Management LP
(Last)(First)(Middle)
D81 CALLE C
SUITE 301 PMB 1202
(Street)
DORADO PUERTO RICO 00646-2051
(City)(State)(Zip)
UNITED STATES
(Country)		2. Date of Event Requiring Statement (Month/Day/Year)
03/31/2026		3. Issuer Name and Ticker or Trading Symbol
Korro Bio, Inc. [ KRRO ]
3a. Foreign Trading Symbol
5. If Amendment, Date of Original Filed (Month/Day/Year)
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
DirectorX10% Owner
Officer (give title below)Other (specify below)
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
XForm filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common stock, $0.001 par value per share1,537,776ISee footnote(1)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year)3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
1. Name and Address of Reporting Person*
Lynx1 Capital Management LP
(Last)(First)(Middle)
D81 CALLE C
SUITE 301 PMB 1202
(Street)
DORADO PUERTO RICO 00646-2051
(City)(State)(Zip)
UNITED STATES
(Country)
Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Nichols Weston
(Last)(First)(Middle)
D81 CALLE C
SUITE 301 PMB 1202
(Street)
DORADO PUERTO RICO 00646-2051
(City)(State)(Zip)
UNITED STATES
(Country)
Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
Explanation of Responses:
1. The securities to which this filing relates are held directly by Lynx1 Master Fund LP to which Lynx1 Capital Management LP (the "Investment Manager") serves as investment manager. Weston Nichols ("Mr. Nichols") is the sole member of Lynx1 Capital Management GP LLC, the general partner of the Investment Manager. Each of the Investment Manager and Mr. Nichols disclaims beneficial ownership of the securities to which this filing relates for purposes of Section 16 of the Securities and Exchange Act of 1934, as amended, except to the extent of his or its pecuniary interest therein, if any.
Lynx1 Capital Management LP, By: Lynx1 Capital Management GP LLC, its general partner, By: /s/ Weston Nichols, Sole Member04/02/2026
/s/ Weston Nichols04/02/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What does Korro Bio (KRRO) disclose in this Form 3 filing?

Korro Bio discloses an initial statement of ownership on Form 3. It shows that an affiliated investment fund indirectly holds 1,537,776 shares of common stock, establishing these entities as significant, over ten percent, shareholders under Section 16 reporting rules.

How many Korro Bio (KRRO) shares are reported as indirectly owned?

The filing reports indirect ownership of 1,537,776 shares of Korro Bio common stock. This figure reflects the position held by Lynx1 Master Fund LP, managed by Lynx1 Capital Management LP, rather than direct personal holdings by Weston Nichols.

Who are the reporting persons in the Korro Bio (KRRO) Form 3?

The reporting persons are Lynx1 Capital Management LP and Weston Nichols. Both are identified as more than ten percent owners for reporting purposes, connected through their roles with Lynx1 Master Fund LP, which directly holds the Korro Bio common stock position.

How are the Korro Bio (KRRO) shares actually held according to the Form 3?

The shares are held directly by Lynx1 Master Fund LP. Lynx1 Capital Management LP serves as its investment manager, and Weston Nichols is the sole member of the general partner of that manager, so their reported ownership is indirect through this fund structure.

What ownership disclaimer appears in the Korro Bio (KRRO) Form 3 footnote?

The footnote states that Lynx1 Capital Management LP and Weston Nichols disclaim beneficial ownership of the securities for Section 16 purposes, except to the extent of any pecuniary interest they may have. This clarifies they report indirectly but do not claim full economic ownership.