Korro Bio: Lynx1 fund buys 79,809 shares

Lynx1 Master Fund LP held the shares directly; the reporting persons, each listed as a ten-percent owner, disclaim beneficial ownership except for any pecuniary interest.

Rhea-AI Filing Summary

Korro Bio, Inc. (KRRO) reported that Lynx1 Master Fund LP purchased 79,809 shares across four transactions on October 22, October 23 and October 26, 2026. The reported weighted-average prices were $9.6764 for 12,175 shares and $11.0366 for 40,000 shares on October 22; $12.1061 for 2,510 shares on October 23; and $11.7454 for 25,124 shares on October 26.

Lynx1 Capital Management LP serves as investment manager to the fund. The reporting persons, Lynx1 Capital Management LP and Nichols Weston, are each identified as ten-percent owners and disclaim beneficial ownership except to the extent of any pecuniary interest. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Net Buyer: 79,809 shares

Net Buy 4 txns

Insider Lynx1 Capital Management LP, Nichols Weston

Role 10% Owner | 10% Owner

Bought 79,809 shs ($885K)

Type	Security	Shares	Price	Value
Purchase	Common stock, $0.001 par value per share F5, F1	25,124	$11.7454	$295K
Purchase	Common stock, $0.001 par value per share F4, F1	2,510	$12.1061	$30K
Purchase	Common stock, $0.001 par value per share F2, F1	12,175	$9.6764	$118K
Purchase	Common stock, $0.001 par value per share F3, F1	40,000	$11.0366	$441K

Holdings After Transaction: Common stock, $0.001 par value per share — 1,624,789 shares (Indirect, See footnote)

Footnotes (5)

1. F1. 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.
2. F2. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.54 to $9.8550 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission (the "SEC"), upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.
3. F3. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $10.955 to $11.11 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.
4. F4. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $11.9250 to $12.3500 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.
5. F5. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $11.7450 to $11.80 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

Key Figures

Shares purchased: 12,175 shares Weighted-average purchase price: $9.6764 per share Shares purchased: 40,000 shares +5 more

8 metrics

Shares purchased 12,175 shares October 22, 2026

Weighted-average purchase price $9.6764 per share October 22, 2026

Shares purchased 40,000 shares October 22, 2026

Weighted-average purchase price $11.0366 per share October 22, 2026

Shares purchased 2,510 shares October 23, 2026

Weighted-average purchase price $12.1061 per share October 23, 2026

Shares purchased 25,124 shares October 26, 2026

Weighted-average purchase price $11.7454 per share October 26, 2026

Key Terms

weighted average price, beneficial ownership, pecuniary interest

3 terms

weighted average price financial

"price reported in Column 4 is a weighted average price"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

beneficial ownership regulatory

"disclaims beneficial ownership of the securities"

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 regulatory

"except to the extent of his or its pecuniary interest therein"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many KRRO shares did Lynx1 Master Fund LP purchase?

Lynx1 Master Fund LP purchased 79,809 shares in four transactions dated October 22, October 23 and October 26, 2026.

What prices were reported for the KRRO share purchases?

The weighted-average prices were $9.6764 for 12,175 shares and $11.0366 for 40,000 shares on October 22, 2026; $12.1061 for 2,510 shares on October 23; and $11.7454 for 25,124 shares on October 26.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 10/26/2026 - 06:37 PM EDT Accepted by SEC EDGAR 10/26/2026 - 06:37 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Korro Bio, Inc. [ KRRO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/22/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common stock, $0.001 par value per share	10/22/2026		P		12,175	A	$9.6764(2)	1,557,155	I	See footnote(1)
Common stock, $0.001 par value per share	10/22/2026		P		40,000	A	$11.0366(3)	1,597,155	I	See footnote(1)
Common stock, $0.001 par value per share	10/23/2026		P		2,510	A	$12.1061(4)	1,599,665	I	See footnote(1)
Common stock, $0.001 par value per share	10/26/2026		P		25,124	A	$11.7454(5)	1,624,789	I	See footnote(1)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount 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

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% 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

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% 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.

2. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.54 to $9.8550 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission (the "SEC"), upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

3. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $10.955 to $11.11 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

4. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $11.9250 to $12.3500 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

5. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $11.7450 to $11.80 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

	Lynx1 Capital Management LP, By: Lynx1 Capital Management GP LLC, its general partner, By: /s/ Weston Nichols, Sole Member	10/26/2026
	/s/ Weston Nichols	10/26/2026
	** Signature of Reporting Person	Date
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 4 (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 4: SEC 1474 (03-26)