Brian Taylor Slingsby - 19 Feb 2026 Form 4 Insider Report for Mineralys Therapeutics, Inc. (MLYS)

Reporting relationship: Director, 10%+ Owner
Issuer ticker: MLYS
Reported as of: 19 Feb 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 20 Feb 2026, 19:47:18 UTC
Prior SEC filing: 21 Nov 2025
Source filing: View source filing
Reporting owner signature: Catalys Pacific Fund, LP, By: Catalys Pacific Fund GP, LP, its General Partner, By: Catalys Pacific, LLC, its General Partner, By: Brian Taylor Slingsby, its Managing Partner, By: /s/ Adam Levy, Attorney-in-fact

Key filing fact

Brian Taylor Slingsby filed Form 4 for Mineralys Therapeutics, Inc. (MLYS) on 20 Feb 2026.

Key facts

This page summarizes Brian Taylor Slingsby's Form 4 filing for Mineralys Therapeutics, Inc. (MLYS).
6 reported transactions and 3 derivative rows are listed below.
Accepted by SEC: 20 Feb 2026, 19:47.

Change

Previous filing in this sequence was filed on 21 Nov 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001963901 Primary reporting owner

Slingsby Brian Taylor

Relationship: Director, 10%+ Owner
Address: 1700 WESTLAKE AVE. N, SUITE 200, THINKSPACE, SEATTLE
Signature: Catalys Pacific Fund, LP, By: Catalys Pacific Fund GP, LP, its General Partner, By: Catalys Pacific, LLC, its General Partner, By: Brian Taylor Slingsby, its Managing Partner, By: /s/ Adam Levy, Attorney-in-fact
Signature date: 20 Feb 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MLYS transaction

Common Stock

Award

Transaction value: $0
Shares: +6,200
Change %
Price: $0.000000
Shares after: 6,200
Date: 19 Feb 2026
Ownership: Direct
Footnotes: F1

MLYS transaction

Common Stock

Other

Transaction value: $0
Shares: -6,200
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 19 Feb 2026
Ownership: Direct
Footnotes: F1, F2

MLYS transaction

Common Stock

Other

Transaction value: $0
Shares: +6,200
Change %: +0.08%
Price: $0.000000
Shares after: 7,910,038
Date: 19 Feb 2026
Ownership: See footnote
Footnotes: F1, F2, F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MLYS transaction Derivative

Stock Option

Award

Transaction value: $0
Shares: +8,300
Change %
Price: $0.000000
Shares after: 8,300
Date: 19 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 8,300
Exercise price: $28.06
Footnotes: F4

MLYS transaction Derivative

Stock Option

Other

Transaction value: $0
Shares: -8,300
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 19 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 8,300
Exercise price: $28.06
Footnotes: F2, F4

MLYS transaction Derivative

Stock Option

Other

Transaction value: $0
Shares: +8,300
Change %
Price: $0.000000
Shares after: 8,300
Date: 19 Feb 2026
Ownership: See footnote
Underlying class: Common Stock
Underlying amount: 8,300
Exercise price: $28.06
Footnotes: F2, F3, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

Restricted Stock Units (RSUs) are granted to the reporting person for no additional cash consideration, each of which represents a contingent right to receive one share of common stock upon vesting of these RSUs in one annual installment following the date of grant.

Footnote F2

Represents stock options or RSUs transferred pursuant to an option transfer agreement between the Reporting Person and Catalys Pacific Fund, LP.

Footnote F3

Represents securities held directly by Catalys Pacific Fund, LP. The general partner of Catalys Pacific Fund, LP is Catalys Pacific Fund GP, LP. Brian Taylor Slingsby is the managing partner of Catalys Pacific, LLC, the general partner of the General Partner. Catalys Pacific, LLC, Catalys Pacific Fund GP, LP and Brian Taylor Slingsby may be deemed to have voting and investment power over the shares held of record by Catalys Pacific Fund, LP. Each of Catalys Pacific, LLC, Catalys Pacific Fund GP, LP and Brian Taylor Slingsby disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein.

Footnote F4

The stock option vests in 12 substantially equal monthly installments following the date of grant.