X0306 4 2022-05-10 0001541119 Sound Financial Bancorp, Inc. SFBC 0001742333 Sexton Heidi C/O SOUND FINANCIAL BANCORP, INC. 2400 3RD AVENUE, SUITE 150 SEATTLE WA 98121 1 Executive Vice President/COO Common Stock 2022-05-10 4 M 0 1000 22.31 A 13696 D Common Stock 2022-05-10 4 F 0 595 37.50 D 13101 D Common Stock 8312 I Held by ESOP Common Stock 2264 I Held by 401(k) Plan Stock Option (Right to Buy) 35.2700 2028-11-19 Common Stock 1400 1400 D Stock Option (Right to Buy) 22.31 2022-05-10 4 M 0 1000 0 D 2026-01-29 Common Stock 1000 500 D Stock Option (Right to Buy) 28.3400 2027-01-27 Common Stock 3000 3000 D Stock Option (Right to Buy) 33.5000 2029-01-25 Common Stock 1500 1500 D Stock Option (Right to Buy) 36.2600 2030-01-31 Common Stock 1350 1350 D Stock Option (Right to Buy) 32.4600 2031-01-27 Common Stock 1900 1900 D Stock Option (Right to Buy) 42.8500 2032-01-28 Common Stock 2000 2000 D Vest in five equal annual installments commencing on November 19, 2019. Option is fully exercisable. Options vest in five equal annual installments beginning on January 25, 2019. Options vest in five equal annual installments beginning on January 31, 2020. Options vest in five equal annual installments beginning on January 27, 2021. Options vest in five equal annual installments beginning on January 28, 2022. Reflects ESOP allocations that have occurred since the date of the reporting person's last report. /s/ Laura Lee Stewart, Attorney-in-Fact 2022-05-11