Securities and Exchange Commission
Washington, D.C. 20549
Schedule 13G
(Rule 13d-102)

Information to be Included in Statements Filed Pursuant
to § 240.13d-1(b), (c) and (d) and Amendments Thereto Filed
Pursuant to § 240.13d-2

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. )*

Mineralys Therapeutics, Inc.
(Name of Issuer)

Common Stock
(Title of Class of Securities)

603170101
(CUSIP Number)
December 31, 2023
(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)
[X]Rule 13d-1(d)
* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.
The information required in 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. 603170101Schedule 13G
Page 1 of 9


1
Names of Reporting Persons
Catalys Pacific Fund, LP
2Check the Appropriate Box if a Member of a Group
(a) [ ]
(b) [ ]
3
SEC Use Only
_
4
Citizenship or Place of Organization
Cayman Islands
Number of Shares Beneficially Owned by Each Reporting Person With5
Sole Voting Power
    0
6
Shared Voting Power
    9,209,245
7
Sole Dispositive Power
    0
8
Shared Dispositive Power
    9,209,245
9
Aggregate Amount Beneficially Owned by Each Reporting Person
    9,209,245
10
Check if the Aggregate Amount in Row (9) Excludes Certain Shares
    Not Applicable
11
Percent of Class Represented by Amount in Row 9
    22.4%
12
Type of Reporting Person
    PN



CUSIP No. 603170101Schedule 13G
Page 2 of 9


1
Names of Reporting Persons
Catalys Pacific Fund GP, LP
2Check the Appropriate Box if a Member of a Group
(a) [ ]
(b) [ ]
3
SEC Use Only
_
4
Citizenship or Place of Organization
Cayman Islands
Number of Shares Beneficially Owned by Each Reporting Person With5
Sole Voting Power
    0
6
Shared Voting Power
    9,209,245
7
Sole Dispositive Power
    0
8
Shared Dispositive Power
    9,209,245
9
Aggregate Amount Beneficially Owned by Each Reporting Person
    9,209,245
10
Check if the Aggregate Amount in Row (9) Excludes Certain Shares
    Not Applicable
11
Percent of Class Represented by Amount in Row 9
    22.4%
12
Type of Reporting Person
    PN



CUSIP No. 603170101Schedule 13G
Page 3 of 9


1
Names of Reporting Persons
Catalys Pacific, LLC
2Check the Appropriate Box if a Member of a Group
(a) [ ]
(b) [ ]
3
SEC Use Only
_
4
Citizenship or Place of Organization
Cayman Islands
Number of Shares Beneficially Owned by Each Reporting Person With5
Sole Voting Power
    0
6
Shared Voting Power
    9,209,245
7
Sole Dispositive Power
    0
8
Shared Dispositive Power
    9,209,245
9
Aggregate Amount Beneficially Owned by Each Reporting Person
    9,209,245
10
Check if the Aggregate Amount in Row (9) Excludes Certain Shares
    Not Applicable
11
Percent of Class Represented by Amount in Row 9
    22.4%
12
Type of Reporting Person
    OO



CUSIP No. 603170101Schedule 13G
Page 4 of 9


1
Names of Reporting Persons
Brian Taylor Slingsby
2Check the Appropriate Box if a Member of a Group
(a) [ ]
(b) [ ]
3
SEC Use Only
_
4
Citizenship or Place of Organization
United States of America
Number of Shares Beneficially Owned by Each Reporting Person With5
Sole Voting Power
    0
6
Shared Voting Power
    9,209,245
7
Sole Dispositive Power
    0
8
Shared Dispositive Power
    9,209,245
9
Aggregate Amount Beneficially Owned by Each Reporting Person
    9,209,245
10
Check if the Aggregate Amount in Row (9) Excludes Certain Shares
    Not Applicable
11
Percent of Class Represented by Amount in Row 9
    22.4%
12
Type of Reporting Person
    IN




CUSIP No. 603170101Schedule 13G
Page 5 of 9

ITEM 1.(a)    Name of Issuer:
Mineralys Therapeutics, Inc. (the “Issuer”).
(b)Address of Issuer’s Principal Executive Offices:
150 N. Radnor Chester Rd, Suite F200, Radnor, PA 19087
ITEM 2.(a)    Name of Person Filing:
Each of the following is hereinafter individually referred to as a “Reporting Person” and collectively as the “Reporting Persons.” This statement is filed on behalf of:
Catalys Pacific Fund, LP
Catalys Pacific Fund GP, LP
Catalys Pacific, LLC
Brian Taylor Slingsby
(b)Address or Principal Business Office:
The principal business address for Catalys Pacific Fund, LP, Catalys Pacific Fund GP, LP and Catalys Pacific, LLC is PO Box 309, Ugland House, Grand Cayman, KY1-1104, Cayman Islands.
The principal business address for Brian Taylor Slingsby is 1516 Bigelow Ave N, Seattle, WA 98109.
(c)Citizenship of each Reporting Person is:
Brian Taylor Slingsby is a citizen of the United States. The other Reporting Persons are each entities organized under the laws of the Cayman Islands.
(d)Title of Class of Securities:
Common Stock, par value $0.0001 per share (“Common Stock”).
(e)CUSIP Number:
603170101
ITEM 3.
Not applicable.
ITEM 4.Ownership.

(a-c)

The ownership information presented below represents beneficial ownership of Common Stock of the Issuer as of December 31, 2023, based upon 41,105,118 shares of Common Stock outstanding as of November 1,


CUSIP No. 603170101Schedule 13G
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2023, as disclosed in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 7, 2023.

Reporting Person
Amount
beneficially
owned
Percent
of class:
Sole power to vote or to direct the vote:Shared power to vote or to direct the vote:
Sole power to dispose or to direct the disposition
of:
Shared
power to
dispose or
to direct
the
disposition
of:
Catalys Pacific Fund, LP9,209,24522.4%09,209,24509,209,245
Catalys Pacific Fund GP, LP9,209,24522.4%09,209,24509,209,245
Catalys Pacific, LLC9,209,24522.4%09,209,24509,209,245
Brian Taylor Slingsby9,209,24522.4%09,209,24509,209,245

Catalys Pacific Fund, LP is the beneficial owner of 9,223,912 shares of Common Stock, which includes 9,194,579 shares of Common Stock held of record by Catalys Pacific Fund, LP and 14,666 shares of Common Stock underlying stock options that are exercisable within 60 days of December 31, 2023.
Catalys Pacific Fund GP, LP is the general partner of Catalys Pacific Fund, LP. Catalys Pacific, LLC is the general partner of Catalys Pacific Fund GP, LP. Brian Taylor Slingsby is the managing director of Catalys Pacific, LLC. As a result, each of the Reporting Persons may be deemed to share beneficial ownership over the securities reported herein.
ITEM 5.Ownership of Five Percent or Less of a Class.
Not applicable.
ITEM 6.Ownership of More than Five 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.
Not applicable.
ITEM 8.Identification and Classification of Members of the Group.
Not applicable.
ITEM 9.Notice of Dissolution of Group.
Not applicable.


CUSIP No. 603170101Schedule 13G
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ITEM 10. Certification.
Not applicable.



CUSIP No. 603170101Schedule 13G
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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.

Date:    February 13, 2024


Catalys Pacific Fund, LP
By: Catalys Pacific Fund GP, LP, its General Partner
By: Catalys Pacific, LLC, its General Partner
By:/s/ Brian Taylor Slingsby
Name:Brian Taylor Slingsby
Title:Managing Director
Catalys Pacific Fund GP, LP
By: Catalys Pacific, LLC, its General Partner
By:/s/ Brian Taylor Slingsby
Name:Brian Taylor Slingsby
Title:Managing Director
Catalys Pacific, LLC
By:/s/ Brian Taylor Slingsby
Name:Brian Taylor Slingsby
Title:Managing Director
/s/ Brian Taylor Slingsby


CUSIP No. 603170101Schedule 13G
Page 9 of 9

LIST OF EXHIBITS
Exhibit No.
Description
99