Filing Details

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Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With:

Sole Voting Power

0 shares

Shared Voting Power

3,566,912 shares (1)

Sole Dispositive Power

0 shares

Shared Dispositive Power

3,566,912 shares (1)

Accession Number:: 0001193125-23-228444
Form Type:: 13D Filing
Publication Date:: 2023-09-04 20:00:00

Filed By:: Frazier Life Sciences Ix, L.p.
Company:: Mirum Pharmaceuticals Inc. (NASDAQ:MIRM)
Filing Date:: 2023-09-05
SEC Url:: 13D Filing

Ownership Summary

Please notice the below summary table is generated without human intervention and may contain errors. Please refer to the complete filing displayed below for exact figures.

Name	Sole Voting Power	Shared Voting Power	Sole Dispositive Power	Shared Dispositive Power	Aggregate Amount Owned Power	Percent of Class
Frazier Life Sciences IX	0	3,566,912	0	3,566,912	3,566,912	7.7%
FHMLS IX	0	3,566,912	0	3,566,912	3,566,912	7.7%
FHMLS IX	0	3,566,912	0	3,566,912	3,566,912	7.7%
Frazier Life Sciences X	0	147,991	0	147,991	147,991	0.3%
FHMLS X	0	147,991	0	147,991	147,991	0.3%
FHMLS X	0	147,991	0	147,991	147,991	0.3%
Frazier Life Sciences Public Fund	0	1,205,732	0	1,205,732	1,205,732	2.6%
FHMLSP	0	1,205,732	0	1,205,732	1,205,732	2.6%
FHMLSP	0	1,205,732	0	1,205,732	1,205,732	2.6%
Frazier Life Sciences Public Overage Fund	0	782,344	0	782,344	782,344	1.7%
FHMLSP Overage	0	782,344	0	782,344	782,344	1.7%
FHMLSP Overage	0	782,344	0	782,344	782,344	1.7%
Frazier Life Sciences XI	0	472,413	0	472,413	472,413	1.0%
FHMLS XI	0	472,413	0	472,413	472,413	1.0%
FHMLS XI	0	472,413	0	472,413	472,413	1.0%
James N. Topper	0	6,175,392	0	6,175,392	6,175,392	13.3%
Patrick J. Heron	51,000	6,175,392	51,000	6,175,392	6,226,392	13.4%
Albert Cha	0	1,988,076	0	1,988,076	1,988,076	4.3%
James Brush	0	1,988,076	0	1,988,076	1,988,076	4.3%
Daniel Estes	0	472,413	0	472,413	472,413	1.0%

Filing

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 5)*

Mirum Pharmaceuticals, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

604749 101

(CUSIP Number)

Steve R. Bailey

601 Union Street, Suite 3200

Seattle, WA 98101

Telephone: (206) 621-7200

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

August 31, 2023

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are to be sent.

*	The remainder of this cover page shall be filled out for a reporting persons initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).


CUSIP No. 604749 101


1.		Name of Reporting Persons. Frazier Life Sciences IX, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

Consists of 3,566,912 shares of Common Stock held directly by Frazier Life Sciences IX, L.P. FHMLS IX, L.P. is the general partner of Frazier Life Sciences IX, L.P. and FHMLS IX, L.L.C. is the general partner of FHMLS IX, L.P. Patrick J. Heron and James N. Topper are the members of FHMLS IX, L.L.C. and therefore share voting and investment power over the shares held by Frazier Life Sciences IX, L.P.

(2)

Based on (i) 38,297,975 shares of Common Stock outstanding on July 28, 2023 as set forth in the Issuers Form 10-Q as filed with the SEC on August 7, 2023 and (ii) 8,000,000 shares of Common Stock that were sold by the Issuer in connection with its private placement offering as described in the Issuers Current Form 8-K filed with the SEC on September 5, 2023.

Page 2


CUSIP No. 604749 101


1.		Name of Reporting Persons. FHMLS IX, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

(2)

Page 3


CUSIP No. 604749 101


1.		Name of Reporting Persons. FHMLS IX, L.L.C.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

(2)

Page 4


CUSIP No. 604749 101


1.		Name of Reporting Persons. Frazier Life Sciences X, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

Consists of 147,991 shares of Common Stock held directly by Frazier Life Sciences X, L.P. FHMLS X, L.P. is the general partner of Frazier Life Sciences X, L.P. and FHMLS X, L.L.C. is the general partner of FHMLS X, L.P. Patrick J. Heron and James N. Topper are the members of FHMLS X, L.L.C. and therefore share voting and investment power over the shares held by Frazier Life Sciences X, L.P.

(2)

Page 5


CUSIP No. 604749 101


1.		Name of Reporting Persons. FHMLS X, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

(2)

Page 6


CUSIP No. 604749 101


1.		Name of Reporting Persons. FHMLS X, L.L.C.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

(2)

Page 7


CUSIP No. 604749 101


1.		Name of Reporting Persons. Frazier Life Sciences Public Fund, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

Consists of 1,205,732 shares of Common Stock held directly by Frazier Life Sciences Public Fund, L.P. FHMLSP, L.P. is the general partner of Frazier Life Sciences Public Fund, L.P. and FHMLSP, L.L.C. is the general partner of FHMLSP, L.P. Patrick J. Heron, James N. Topper, Albert Cha and James Brush are the members of FHMLSP, L.L.C. and therefore share voting and investment power over the shares held by Frazier Life Sciences Public Fund, L.P.

(2)

Page 8


CUSIP No. 604749 101


1.		Name of Reporting Persons. FHMLSP, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

(2)

Page 9


CUSIP No. 604749 101


1.		Name of Reporting Persons. FHMLSP, L.L.C.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

(2)

Page 10


CUSIP No. 604749 101


1.		Name of Reporting Persons. Frazier Life Sciences Public Overage Fund, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

Consists of 782,344 shares of Common Stock held directly by Frazier Life Sciences Public Overage Fund, L.P. FHMLSP Overage, L.P. is the general partner of Frazier Life Sciences Public Overage Fund, L.P. and FHMLSP Overage, L.L.C. is the general partner of FHMLSP Overage, L.P. Patrick J. Heron, James N. Topper, Albert Cha and James Brush are the members of FHMLSP Overage, L.L.C. and therefore share voting and investment power over the shares held by Frazier Life Sciences Public Overage Fund, L.P.

(2)

Page 11


CUSIP No. 604749 101


1.		Name of Reporting Persons. FHMLSP Overage, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

(2)

Page 12


CUSIP No. 604749 101


1.		Name of Reporting Persons. FHMLSP Overage, L.L.C.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

(2)

Page 13


CUSIP No. 604749 101


1.		Name of Reporting Persons. Frazier Life Sciences XI, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

Consists of 472,413 shares of Common Stock held directly by Frazier Life Sciences XI, L.P. FHMLS XI, L.P. is the general partner of Frazier Life Sciences XI, L.P. and FHMLS XI, L.L.C. is the general partner of FHMLS XI, L.P. Patrick J. Heron, James N. Topper and Daniel Estes are the members of FHMLS XI, L.L.C. and therefore share voting and investment power over the shares held by Frazier Life Sciences XI, L.P.

(2)

Page 14


CUSIP No. 604749 101


1.		Name of Reporting Persons. FHMLS XI, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

(2)

Page 15


CUSIP No. 604749 101


1.		Name of Reporting Persons. FHMLS XI, L.L.C.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

(2)

Page 16


CUSIP No. 604749 101


1.		Name of Reporting Persons. James N. Topper
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization United States Citizen

(1)

Consists of (i) 3,566,912 shares of Common Stock held directly by Frazier Life Sciences IX, L.P., (ii) 147,991 shares of Common Stock held directly by Frazier Life Sciences X, L.P., (iii) 1,205,732 shares of Common Stock held directly by Frazier Life Sciences Public Fund, L.P., (iv) 782,344 shares of Common Stock held directly by Frazier Life Sciences Public Overage Fund, L.P. and (v) 472,413 shares of Common Stock held directly by Frazier Life Sciences XI, L.P. FHMLS IX, L.P. is the general partner of Frazier Life Sciences IX, L.P. and FHMLS IX, L.L.C. is the general partner of FHMLS IX, L.P. Patrick J. Heron and James N. Topper are the members of FHMLS IX, L.L.C. and therefore share voting and investment power over the shares held by Frazier Life Sciences IX, L.P. FHMLS X, L.P. is the general partner of Frazier Life Sciences X, L.P. and FHMLS X, L.L.C. is the general partner of FHMLS X, L.P. Patrick J. Heron and James N. Topper are the members of FHMLS X, L.L.C. and therefore share voting and investment power over the shares held by Frazier Life Sciences X, L.P. FHMLSP, L.P. is the general partner of Frazier Life Sciences Public Fund, L.P. and FHMLSP, L.L.C. is the general partner of FHMLSP, L.P. Patrick J. Heron, James N. Topper, Albert Cha and James Brush are the members of FHMLSP, L.L.C. and therefore share voting and investment power over the shares held by Frazier Life Sciences Public Fund, L.P. FHMLSP Overage, L.P. is the general partner of Frazier Life Sciences Public Overage Fund, L.P. and FHMLSP Overage, L.L.C. is the general partner of FHMLSP Overage, L.P. Patrick J. Heron, James N. Topper, Albert Cha and James Brush are the members of FHMLSP Overage, L.L.C. and therefore share voting and investment power over the shares held by Frazier Life Sciences Public Overage Fund, L.P. FHMLS XI, L.P. is the general partner of Frazier Life Sciences XI, L.P. and FHMLS XI, L.L.C. is the general partner of FHMLS XI, L.P. Patrick J. Heron, James N. Topper and Daniel Estes are the members of FHMLS XI, L.L.C. and therefore share voting and investment power over the shares held by Frazier Life Sciences XI, L.P.

(2)

Page 17


CUSIP No. 604749 101


1.		Name of Reporting Persons. Patrick J. Heron
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization United States Citizen

(1)	Consists of 51,000 shares of Common Stock that are issuable upon the exercise of options held directly by Mr. Heron that are exercisable within 60 days of August 31, 2023.

(2)

(3)

Based on (i) 38,297,975 shares of Common Stock outstanding on July 28, 2023 as set forth in the Issuers Form 10-Q as filed with the SEC on August 7, 2023, (ii) 8,000,000 shares of Common Stock that were sold by the Issuer in connection with its private placement offering as described in the Issuers Current Form 8-K filed with the SEC on September 5, 2023 and (iii) 51,000 shares of Common Stock that are issuable upon the exercise of options held directly by Mr. Heron that are exercisable within 60 days of August 31, 2023.

Page 18


CUSIP No. 604749 101


1.		Name of Reporting Persons. Albert Cha
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization United States Citizen

(1)

Consists of (i) 1,205,732 shares of Common Stock held directly by Frazier Life Sciences Public Fund, L.P. and (ii) 782,344 shares of Common Stock held directly by Frazier Life Sciences Public Overage Fund, L.P. FHMLSP, L.P. is the general partner of Frazier Life Sciences Public Fund, L.P. and FHMLSP, L.L.C. is the general partner of FHMLSP, L.P. Patrick J. Heron, James N. Topper, Albert Cha and James Brush are the members of FHMLSP, L.L.C. and therefore share voting and investment power over the shares held by Frazier Life Sciences Public Fund, L.P. FHMLSP Overage, L.P. is the general partner of Frazier Life Sciences Public Overage Fund, L.P. and FHMLSP Overage, L.L.C. is the general partner of FHMLSP Overage, L.P. Patrick J. Heron, James N. Topper, Albert Cha and James Brush are the members of FHMLSP Overage, L.L.C. and therefore share voting and investment power over the shares held by Frazier Life Sciences Public Overage Fund, L.P.

(2)

Page 19


CUSIP No. 604749 101


1.		Name of Reporting Persons. James Brush
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization United States Citizen

(1)

(2)

Page 20


CUSIP No. 604749 101


1.		Name of Reporting Persons. Daniel Estes
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization United States Citizen

(1)

(2)

Page 21


CUSIP No. 604749 101

Item 1.

Security and Issuer.

This Amendment No. 5 (Amendment No. 5) to Schedule 13D amends the statement on Schedule 13D filed on July 26 2019 (the Original Schedule 13D) as amended on April 29, 2020, December 18, 2020, August 16, 2022 and April 14, 2023 (the Prior Amendments, and together with the Original Schedule 13D and this Amendment No. 5, the Schedule 13D) with respect to the Common Stock of Mirum Pharmaceuticals, Inc. (the Issuer), having its principal executive office at 950 Tower Lane, Suite 1050, Foster City, California 94404. Except as otherwise specified in this Amendment No. 5, all items in the Original Schedule 13D, as amended by the Prior Amendments, are unchanged. All capitalized terms used in this Amendment No. 5 and not otherwise defined herein have the meanings ascribed to such terms in the Original Schedule 13D, as amended by the Prior Amendments.

Item 2.

Identity and Background

(a)	The entities and persons filing this statement (collectively, the Reporting Persons) are:

Frazier Life Sciences IX, L.P. (FLS IX)

FHMLS IX, L.P.

FHMLS IX, L.L.C.

Frazier Life Sciences X, L.P. (FLS X)

FHMLS X, L.P.

FHMLS X, L.L.C.

Frazier Life Sciences Public Fund, L.P. (FLSPF)

FHMLSP, L.P.

FHMLSP, L.L.C.

Frazier Life Sciences Public Overage Fund, L.P. (FLSPOF)

FHMLSP Overage, L.P.

FHMLSP Overage, L.L.C.

Frazier Life Sciences XI, L.P. (FLS XI)

FHMLS XI, L.P.

FHMLS XI, L.L.C.

James N. Topper (Topper)

Patrick J. Heron (Heron)

Albert Cha (Cha)

James Brush (Brush)

Daniel Estes (Estes)

(b)	The address of the principal place of business for each of the Reporting Persons is:

c/o Frazier Life Sciences Management, L.P.

70 Willow Road, Suite 200

Menlo Park, CA 94025

(c)	FLS IX is a venture capital fund concentrating in life sciences and related fields. The sole business of FHMLS IX, L.P. is to serve as general partner of FLS IX. The sole business of FHMLS IX, L.L.C. is to serve as general partner of FHMLS IX, L.P.

FLS X is a venture capital fund concentrating in life sciences and related fields. The sole business of FHMLS X, L.P. is to serve as general partner of FLS IX. The sole business of FHMLS X, L.L.C. is to serve as general partner of FHMLS X, L.P.

FLSPF is a venture capital fund concentrating in life sciences and related fields. The sole business of FHMLSP, L.P. is to serve as general partner of FLSPF. The sole business of FHMLSP, L.L.C. is to serve as general partner of FHMLSP, L.P.

FLSPOF is a venture capital fund concentrating in life sciences and related fields. The sole business of FHMLSP Overage, L.P. is to serve as general partner of FLSPOF. The sole business of FHMLSP Overage, L.L.C. is to serve as general partner of FHMLSP Overage, L.P.

FLS XI is a venture capital fund concentrating in life sciences and related fields. The sole business of FHMLS XI, L.P. is to serve as general partner of FLS XI. The sole business of FHMLS XI, L.L.C. is to serve as general partner of FHMLS XI, L.P.

The principal business of Topper and Heron is to manage FLS IX, FHMLS IX, L.P., FHMLS IX, L.L.C., FLS X, FHMLS X, L.P., FHMLS X, L.L.C., FLSPF, FHMLSP, L.P., FHMLSP, L.L.C., FLSPOF, FHMLSP Overage, L.P., FHMLSP Overage, L.L.C., FLS XI, FHMLS XI, L.P., FHMLS XI, L.L.C. and a number of affiliated partnerships with similar businesses.

The principal business of Cha and Brush is to manage FLSPF, FHMLSP, L.P., FHMLSP, L.L.C., FLSPOF, FHMLSP Overage, L.P., FHMLSP Overage, L.L.C. and a number of affiliated partnerships with similar businesses.

The principal business of Estes is to manage FLS XI, FHMLS XI, L.P., FHMLS XI, L.L.C. and a number of affiliated partnerships with similar businesses.

(d)	During the last five years, none of the Reporting Persons has been convicted in any criminal proceeding (excluding traffic violations or similar misdemeanors).

(e)

During the last five years, none of the Reporting Persons has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree, or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f)	Citizenship:


Entities:	FLS IX	Delaware, U.S.A.
	FHMLS IX, L.P.	Delaware, U.S.A.
	FHMLS IX, L.L.C.	Delaware, U.S.A.
	FLS X	Delaware, U.S.A.
	FHMLS X, L.P.	Delaware, U.S.A.
	FHMLS X, L.L.C.	Delaware, U.S.A.
	FLSPF	Delaware, U.S.A.
	FHMLSP, L.P.	Delaware, U.S.A.
	FHMLSP, L.L.C.	Delaware, U.S.A.
	FLSPOF	Delaware, U.S.A.
	FHMLSP Overage, L.P.	Delaware, U.S.A.

Page 23


	FHMLSP Overage, L.L.C.	Delaware, U.S.A.
	FLS XI	Delaware, U.S.A.
	FHMLS XI, L.P.	Delaware, U.S.A.
	FHMLS XI, L.L.C.	Delaware, U.S.A.

Individuals:	Topper	United States Citizen
	Heron	United States Citizen
	Cha	United States Citizen
	Brush	United States Citizen
	Estes	United States Citizen

Item 3.

Source and Amount of Funds or Other Consideration

Prior to the Issuers initial public offering (the IPO), FLS IX purchased from the Issuer in a series of private transactions, 24,935,300 shares of Series A Preferred Stock for an aggregate purchase price of $25,000,008.84. Upon closing of the IPO, the shares of Series A Preferred Stock held by FLS IX automatically converted into Common Stock of the Issuer on an 8-to-1 basis, resulting in FLS IX holding a total of 3,116,912 shares of Common Stock at such time. In addition, at the time of the IPO, FLS IX purchased an aggregate of 450,000 shares of Common Stock of the Issuer at the IPO price of $15.00 per share.

On August 12, 2022, FLSPF purchased an aggregate of 210,782 shares of Common Stock of the Issuer for an approximate total purchase price of $4,847,986. Since August 12, 2022, FLSPF has purchased an aggregate of 994,650 shares of Common Stock of the Issuer at weighted average price per shares ranging between $19.4859 and $26.25.

On August 12, 2022, FLS XI purchased an aggregate of 50,087 shares of Common Stock of the Issuer for an approximate total purchase price of $1,152,001. Since August 12, 2022, FLS XI has purchased an aggregate of 422,326 shares of Common Stock of the Issuer at weighted average price per shares ranging between $19.4859 and $26.25.

Since August 12, 2022, FLSPOF has purchased an aggregate of 782,344 shares of Common Stock of the Issuer at weighted average price per shares ranging between $19.4859 and $26.25.

On August 31, 2023, FLS X purchased an aggregate of 147,991 shares of Common Stock of the Issuer at a price per share of $26.25.

FLS IX holds 3,566,912 shares of Common Stock of the Issueras of the date of this filing (the FLS IX Shares), FLS X holds 147,991 shares of Common Stock of the Issueras of the date of this filing (the FLS X Shares), FLSPF holds 1,205,732 shares of Common Stock of the Issueras of the date of this filing (the FLSPF Shares), FLSPOF holds 782,344 shares of Common Stock of the Issueras of the date of this filing (the FLSPOF Shares), and FLS XI holds 472,413 shares of Common Stock of the Issueras of the date of this filing (the FLS XI Shares).

The working capital of FLS IX, FLS X, FLSPF, FLSPOF and FLS XI was the source of the funds for the purchase of the FLS IX Shares, the FLS X Shares, the FLSPF Shares, the FLSPOF Shares and the FLS XI Shares. No part of the purchase price of the FLS IX Shares, the FLS X Shares, the FLSPF Shares, the FLSPOF Shares or the FLS XI Shares was represented by funds or other consideration borrowed or otherwise obtained for the purpose of acquiring, holding, trading or voting the FLS IX Shares, the FLS X Shares, the FLSPF Shares, the FLSPOF Shares and the FLS XI Shares.

Page 24

Item 4.

Purpose of Transaction

Each of FLS IX, FLS X, FLSPF, FLSPOF and FLS XI acquired the FLS IX Shares, the FLS X Shares, the FLSPF Shares, the FLSPOF Shares and the FLS XI Shares, as the case may be, for investment purposes. Depending on market conditions, its continuing evaluation of the business and prospects of the Issuer and other factors, FLS IX, FLS X, FLSPF, FLSPOF and FLS XI and the other Reporting Persons may dispose of or acquire additional shares of the Issuer. Except as set forth above, none of the Reporting Persons has any present plans which relate to or would result in:

(a)

The acquisition by any person of additional securities of the Issuer, or the disposition of securities of the Issuer;

(b)

An extraordinary corporate transaction, such as a merger, reorganization or liquidation, involving the Issuer or any of its subsidiaries;

(c)

A sale or transfer of a material amount of assets of the Issuer or any of its subsidiaries;

(d)

Any change in the present board of directors or management of the Issuer, including any plans or proposals to change the number or term of directors or to fill any existing vacancies on the board;

(e)

Any material change in the present capitalization or dividend policy of the Issuer;

(f)

Any other material change in the Issuers business or corporate structure;

(g)

Changes in the Issuers charter, bylaws or instruments corresponding thereto or other actions which may impede the acquisition of control of the Issuer by any person;

(h)

Causing a class of securities of the Issuer to be delisted from a national securities exchange or to cease to be authorized to be quoted in an inter-dealer quotation system of a registered national securities association;

(i)

A class of equity securities of the Issuer becoming eligible for termination of registration pursuant to Section 12(g)(4) of the Securities Exchange Act of 1934, as amended; or

(j)

Any action similar to any of those enumerated above.

Item 5.

Interest in Securities of the Issuer

(a)

FLS IX is the record owner of the FLS IX Shares. As the sole general partner of FLS IX, FHMLS IX, L.P. may be deemed to beneficially own the FLS IX Shares. As the sole general partner of FHMLS IX, L.P., FHMLS IX, L.L.C. may be deemed to beneficially own the FLS IX Shares. As members of FHMLS IX, L.L.C., each of Topper and Heron may be deemed to beneficially own the FLS IX Shares.

FLS X is the record owner of the FLS X Shares. As the sole general partner of FLS IX, FHMLS X, L.P. may be deemed to beneficially own the FLS X Shares. As the sole general partner of FHMLS X, L.P., FHMLS X, L.L.C. may be deemed to beneficially own the FLS X Shares. As members of FHMLS X, L.L.C., each of Topper and Heron may be deemed to beneficially own the FLS X Shares.

FLSPF is the record owner of the FLSPF Shares. As the sole general partner of FLSPF, FHMLSP, L.P. may be deemed to beneficially own the FLSPF Shares. As the sole general partner of FHMLSP, L.P., FHMLSP, L.L.C. may be deemed to beneficially own the FLSPF Shares. As members of FHMLSP, L.L.C., each of Topper, Heron, Cha and Brush may be deemed to beneficially own the FLSPF Shares.

Page 25

FLSPOF is the record owner of the FLSPOF Shares. As the sole general partner of FLSPOF, FHMLSP Overage, L.P. may be deemed to beneficially own the FLSPOF Shares. As the sole general partner of FHMLSP Overage, L.P., FHMLSP Overage, L.L.C. may be deemed to beneficially own the FLSPOF Shares. As members of FHMLSP Overage, L.L.C., each of Topper, Heron, Cha and Brush may be deemed to beneficially own the FLSPOF Shares.

FLS XI is the record owner of the FLS XI Shares. As the sole general partner of FLS XI, FHMLS XI, L.P. may be deemed to beneficially own the FLS XI Shares. As the sole general partner of FHMLS XI, L.P., FHMLS XI, L.L.C. may be deemed to beneficially own the FLS XI Shares. As members of FHMLS XI, L.L.C., each of Topper, Heron and Estes may be deemed to beneficially own the FLS XI Shares.

The percentage of outstanding Common Stock of the Issuer, which may be deemed to be beneficially owned by each Reporting Person, is set forth on Line 13 of such Reporting Persons cover sheet. For each Reporting Person other than Heron, such percentage was calculated based on (i) 38,297,975 shares of Common Stock outstanding on July 28, 2023 as set forth in the Issuers Form 10-Q as filed with the SEC on August 7, 2023 and (ii) 8,000,000 shares of Common Stock that were sold by the Issuer in connection with its private placement offering as described in the Issuers Current Form 8-K filed with the SEC on September 5, 2023.

Herons percentage was calculated based on (i) 38,297,975 shares of Common Stock outstanding on July 28, 2023 as set forth in the Issuers Form 10-Q as filed with the SEC on August 7, 2023, (ii) 8,000,000 shares of Common Stock that were sold by the Issuer in connection with its private placement offering as described in the Issuers Current Form 8-K filed with the SEC on September 5, 2023 and (iii) 51,000 shares of Common Stock that are issuable upon the exercise of options held directly by Mr. Heron that are exercisable within 60 days of August 31, 2023.

(b)	Regarding the number of shares as to which such person has:

Sole power to vote or to direct the vote: See line 7 of cover sheets.

Shared power to vote or to direct the vote: See line 8 of cover sheets.

Sole power to dispose or to direct the disposition: See line 9 of cover sheets.

Shared power to dispose or to direct the disposition: See line 10 of cover sheets.

(c)	Information with respect to transactions in the Securities which were effected within the past sixty days or since the most recent filing on Schedule 13D, whichever is less, by the Reporting Persons is set forth below.

FLS IX:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

Page 26

FHMLS IX, L.P.:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

FHMLS IX, L.L.C:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

FLS X:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
8/31/2023	Purchase	147,991	Common Stock	$26.25

FHMLS X, L.P.:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

FHMLS X, L.L.C:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

FLSPF:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
8/8/2023	Purchase	12,648	Common Stock	$25.50
8/9/2023	Purchase	18,212	Common Stock	$25.7428
8/14/2023	Purchase	20,237	Common Stock	$25.8528
8/31/2023	Purchase	651,578	Common Stock	$26.25

FHMLSP, L.P.:

Page 27


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

FHMLSP, L.L.C.:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

FLSPOF:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
8/8/2023	Purchase	7,553	Common Stock	$25.50
8/9/2023	Purchase	10,876	Common Stock	$25.7428
8/14/2023	Purchase	12,083	Common Stock	$25.8528
8/31/2023	Purchase	613,987	Common Stock	$26.25

FHMLSP Overage, L.P.:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

FHMLSP Overage, L.L.C.:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

FLS XI:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
8/8/2023	Purchase	4,799	Common Stock	$25.50
8/9/2023	Purchase	6,912	Common Stock	$25.7428
8/14/2023	Purchase	7,680	Common Stock	$25.8528
8/31/2023	Purchase	300,729	Common Stock	$26.25

Page 28

FHMLS XI, L.P.:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

FHMLS XI, L.L.C.:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

Heron:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

Topper:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

Cha:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

Brush:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

Estes:


Date of Transaction	Type of Transaction	Quantity	Class of Stock	Price Per Share (excluding commissions)
N/A	N/A	N/A	N/A	N/A

(d)

No other person is known to have the right to receive or the power to direct the receipt of dividends from, or any proceeds from the sale of, the FLS IX Shares, FLS X Shares, the FLSPF Shares, the FLSPOF Shares, the FLS XI Shares beneficially owned by any of the Reporting Persons, other than the respective limited partners, general partners, members and/or beneficiaries of such Reporting Persons.

Page 29

(e)	Not applicable.

Item 6.

Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer

Investors Rights Agreement

Pursuant to the terms of an Investors Rights Agreement with the Issuer dated November 5, 2018, certain holders of the Issuers Common Stock, including FLS IX, is entitled to rights with respect to the registration of their shares of Common Stock (the Registerable Securities) under the Securities Act of 1933, as amended. Beginning 180 days after the completion of the IPO, the holders of a majority of the then-outstanding Registrable Securities have demand rights to request the registration on Form S-1 of their Registrable Securities, provided the anticipated aggregate offering price, net of selling expenses, would exceed $10.0 million. The Issuer is required to file up to two registration statements that are declared effective upon exercise of these demand registration rights. In addition, the holders of a majority of the then-outstanding Registrable Securities can request that the Issuer register all or part of their shares on Form S-3 if the Issuer is eligible to file a registration statement on Form S-3 and if the aggregate price to the public of the shares offered, net of selling expenses, is at least $1.0 million. The stockholders may only require two registration statements on Form S-3 in a 12-month period. If the Issuer registers any of its securities for public sale, holders of then-outstanding Registrable Securities or their permitted transferees will have the right to include their Registrable Securities in such registration statement, subject to certain exclusions. All of these registration rights will expire, with respect to any particular holder, five years after the effective date of the IPO, or if earlier the date such stockholder (a) holds less than 1% of the Issuers outstanding Common Stock (including shares issuable on conversion of outstanding convertible preferred stock) or (b) can sell all of its shares under Rule 144 of the Securities Act during any 90-day period.

Registration Rights Agreement

On August 31, 2023, certain stockholders of the Issuer, including FLS X, FLS XI, FLSPF and FLSPOF, entered into the Registration Rights Agreement (the Registration Rights Agreement), pursuant to which the Issuer agreed that, within 75 calendar days after the effective date of the Registration Rights Agreement, the Issuer will file with the SEC (at the Issuers sole cost and expense) a registration statement registering the resale of certain securities held by or issuable to such stockholder (the Resale Registration Statement), and the Issuer shall use commercially reasonable efforts to have the Resale Registration Statement declared effective as soon as practicable after the filing thereof.

Other than as described in this Schedule 13D, to the best of the Reporting Persons knowledge, there are no other contracts, arrangements, understandings or relationships (legal or otherwise) among the persons named in Item 2 and between such persons and any person with respect to any securities of the Issuer.

Item 7.

Material to Be Filed as Exhibits

Exhibit A - Agreement regarding filing of joint Schedule 13D.

Exhibit B - Investors Rights Agreement.

Exhibit C - Registration Rights Agreement.

Page 30

SIGNATURES

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.


Date: September 5, 2023	FRAZIER LIFE SCIENCES IX, L.P.
	By FHMLS IX, L.P., its general partner
	By FHMLS IX, L.L.C., its general partner

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	FHMLS IX, L.P.
	By FHMLS IX, L.L.C., its general partner

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	FHMLS IX, L.L.C.

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	FRAZIER LIFE SCIENCES X, L.P.
	By FHMLS X, L.P., its general partner
	By FHMLS X, L.L.C., its general partner

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	FHMLS X, L.P.
	By FHMLS X, L.L.C., its general partner

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Page 31


Date: September 5, 2023	FHMLS X, L.L.C.

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	FRAZIER LIFE SCIENCES PUBLIC FUND, L.P.
	By: FHMLSP, L.P., its General Partner
	By: FHMLSP, L.L.C., its General Partner

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	FHMLSP, L.P.
	By: FHMLSP, L.L.C., its General Partner

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	FHMLSP, L.L.C.

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	FRAZIER LIFE SCIENCES PUBLIC OVERAGE FUND, L.P.
	By: FHMLSP Overage, L.P., its General Partner
	By: FHMLSP Overage, L.L.C., its General Partner

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	FHMLSP OVERAGE, L.P.
	By FHMLSP Overage, L.L.C., its General Partner

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	FHMLSP OVERAGE, L.L.C.

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Page 32


Date: September 5, 2023	FRAZIER LIFE SCIENCES XI, L.P.
	By FHMLS XI, L.P., its general partner
	By FHMLS XI, L.L.C., its general partner

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	FHMLS XI, L.P.
	By FHMLS XI, L.L.C., its general partner

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	FHMLS XI, L.L.C.

	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer

Date: September 5, 2023	By:	*
		James N. Topper

Date: September 5, 2023	By:	*
		Patrick J. Heron

Date: September 5, 2023	By:	**
		Albert Cha

Date: September 5, 2023	By:	**
		James Brush

Date: September 5, 2023	By:	***
		Daniel Estes

Date: September 5, 2023	By:	/s/ Steve R. Bailey
		Steve R. Bailey, as Attorney-in-Fact

Page 33

*	This Schedule 13D was executed by Steve R. Bailey on behalf of the individuals listed above pursuant to a Power of Attorney, a copy of which was filed with the SEC on July 31, 2017.

**	This Schedule 13D was executed by Steve R. Bailey on behalf of the individuals listed above pursuant to a Power of Attorney, a copy of which was filed with the SEC on August 16, 2021.

***	This Schedule 13D was executed by Steve R. Bailey on behalf of the individual listed above pursuant to a Power of Attorney, a copy of which was filed with the SEC on April 18, 2022.

Page 34

Exhibit Index


Exhibit A -		Agreement regarding filing of joint Schedule 13D.

Exhibit B -		Investors Rights Agreement (incorporated by reference to Exhibit 4.2 to the Issuers Registration Statement on Form S-1 filed with the Commission on June 21, 2019).

Exhibit B -		Investors Rights Agreement (incorporated by reference to Exhibit 10.2 to the Issuers Current Report on Form 8-K filed with the Commission on July 16, 2023).

Page 35