X0508 4 2026-02-12 0 0001526243 PERPETUA RESOURCES CORP. PPTA 0001902352 Lyon Mckinsey Margaret 405 S. 8TH STREET, STE 201 BOISE ID 83702 0 1 0 0 (See remarks (7)) 0 Common Shares 2026-02-12 4 S 0 6270 27.54 D 169562 D Common Shares 2026-02-12 4 S 0 37452 27.58 D 132110 D Common Shares 2026-02-16 4 M 0 13636 A 145746 D Restricted Share Units 2026-02-16 4 M 0 13636 0 D Common Shares 13636 34607 D The sale reported on this Form 4 represents shares sold by the Reporting Person to cover tax withholding obligations in connection with the settlement of Restricted Share Units, which vested on February 10, 2026, and were settled in Common Shares of the Issuer. The sale price included on this Form 4 is a weighted average price and is converted to USD based on the daily average exchange rate as reported by the H.10 statistical release of the Board of Governances of the Federal Reserve System on February 6, 2026, of C$1.3644 = US$1.00. These shares were sold in multiple transactions at prices ranging from US$27.40 to US$27.69, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Shares sold at each separate price within the ranges set forth in this footnote (2). The sale reported on this Form 4 represents shares sold by the Reporting Person to cover tax withholding obligations in connection with the settlement of Performance Share Units, which vested on February 11, 2026, when certification of the applicable performance measures occurred, and were settled in Common Shares of the Issuer following such certification. The sale price included on this Form 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from US$27.39 to US$27.93, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Shares sold at each separate price within the ranges set forth in this footnote (4). A restricted share unit ("RSU") entitles the holder to receive one Common Share (or cash equal to the value thereof) for each vested RSU. The RSUs that vested on February 16, 2026 were settled in Common Shares of the Issuer. On February 16, 2024, the reporting person was granted 40,910 RSUs, which vest ratably on each of the first three anniversaries of the grant date, subject to the terms and conditions of the Perpetua Resources Corp. Omnibus Equity Incentive Plan. (7) Senior Vice President, External Affairs at Perpetua Resources Idaho, Inc., a wholly owned subsidiary of Perpetua Resources Corp. /s/ Tanya Nelson, as attorney-in-fact for Mckinsey Lyon 2026-02-17