X0508 4 2025-10-03 0 0001333274 MERCER INTERNATIONAL INC. MERC 0000897485 KELLOGG PETER R 48 WALL STREET C/O IAT INSURANCE CO. LTD NEW YORK NY 10005 0 0 1 0 0 Common Stock 2025-10-03 4 P 0 3700 2.79 A 863700 I Via Non Marital PRK Trust Common Stock 2025-10-03 4 P 0 3122 2.79 A 866822 I Via Non Marital PRK Trust Common Stock 2025-10-28 4 P 0 7700 2.44 A 874522 I Via Non Marital PRK Trust Common Stock 2025-10-28 4 P 0 41778 2.44 A 916300 I Via Non Marital PRK Trust Common Stock 2025-10-29 4 P 0 17000 2.27 A 933300 I Via Non Marital PRK Trust Common Stock 2025-10-29 4 P 0 17000 2.26 A 950300 I Via Non Marital PRK Trust Common Stock 2025-10-29 4 P 0 19000 2.27 A 969300 I Via Non Marital PRK Trust Common Stock 2025-10-29 4 P 0 5540 2.27 A 974840 I Via Non Marital PRK Trust Common Stock 2025-10-30 4 P 0 18650 2.11 A 993490 I Via Non Marital PRK Trust Common Stock 2025-10-30 4 P 0 350 2.11 A 993840 I Via Non Marital PRK Trust Common Stock 2025-10-30 4 P 0 6160 2.11 A 1000000 I Via Non Marital PRK Trust Common Stock 2025-11-04 4 P 0 36602 1.93 A 1036602 I Via Non Marital PRK Trust Common Stock 2025-11-05 4 P 0 36000 1.88 A 1072602 I Via Non Marital PRK Trust Common Stock 2025-11-05 4 P 0 36000 1.91 A 1108602 I Via Non Marital PRK Trust Common Stock 2025-11-05 4 P 0 25938 1.92 A 1134540 I Via Non Marital PRK Trust Common Stock 2025-11-06 4 P 0 36000 1.87 A 1170540 I Via Non Marital PRK Trust Common Stock 2025-11-06 4 P 0 285 1.84 A 1170825 I Via Non Marital PRK Trust Common Stock 2025-11-06 4 P 0 35715 1.89 A 1206540 I Via Non Marital PRK Trust Common Stock 2025-11-06 4 P 0 58000 1.86 A 1264540 I Via Non Marital PRK Trust Common Stock 2025-11-07 4 P 0 6099 1.56 A 1270639 I Via Non Marital PRK Trust Common Stock 2025-11-07 4 P 0 1200 1.61 A 1271839 I Via Non Marital PRK Trust Common Stock 2025-11-07 4 P 0 28701 1.67 A 1300540 I Via Non Marital PRK Trust Common Stock 2025-11-07 4 P 0 18000 1.79 A 1318540 I Via Non Marital PRK Trust Common Stock 2025-10-30 4 P 0 36000 2.07 A 646000 D Common Stock 2025-11-12 4 P 0 70000 1.72 A 1070000 I Via Harco Common Stock 2025-11-12 4 P 0 25000 1.69 A 1095000 I Via Harco Common Stock 2025-11-13 4 P 0 100000 1.72 A 1195000 I Via Harco Common Stock 2025-11-13 4 P 0 125000 1.74 A 1320000 I Via Harco Common Stock 2025-11-12 4 P 0 200000 1.68 A 1520000 I Via Harco Common Stock 2300000 I Via Spouse /s/ Marguerite Gorman, attorney-in-fact 2025-12-09