X0508 4 2023-07-20 0 0001541119 Sound Financial Bancorp, Inc. SFBC 0001113303 STILWELL JOSEPH 200 CALLE DEL SANTO CRISTO SAN JUAN PR 00901 PUERTO RICO 0 0 1 0 0001397076 Stilwell Value LLC 111 BROADWAY, 12TH FLOOR NEW YORK NY 10006 0 0 1 0 0001555931 Stilwell Value Partners VII, L.P. 111 BROADWAY, 12TH FLOOR NEW YORK NY 10006 0 0 1 0 0001564452 Stilwell Activist Fund, L.P. 111 BROADWAY, 12TH FLOOR NEW YORK NY 10006 0 0 1 0 0001573720 Stilwell Activist Investments, L.P. 111 BROADWAY, 12TH FLOOR NEW YORK NY 10006 0 0 1 0 0001048212 STILWELL PARTNERS L P 111 BROADWAY, 12TH FL. NEW YORK NY 10006 0 0 1 0 0 Common Stock 2023-07-20 4 P 0 500 35.9933 A 27864 I See footnote Common Stock 36030 I See footnote Common Stock 2023-07-20 4 P 0 2000 35.9933 A 169334 I See footnote Common Stock 128000 I See footnote These shares are owned directly by Stilwell Activist Fund, L.P. ("SAF") and indirectly by Joseph Stilwell in his capacity as the managing member and owner of Stilwell Value LLC ("Value"), which is the general partner of SAF. Joseph Stilwell disclaims beneficial ownership of all shares reported as owned indirectly except to the extent of his pecuniary interest therein. These shares are owned directly by Stilwell Value Partners VII, L.P. ("SVP VII") and indirectly by Joseph Stilwell in his capacity as the managing member and owner of Value, which is the general partner of SVP VII. Joseph Stilwell disclaims beneficial ownership of all shares reported as owned indirectly except to the extent of his pecuniary interest therein. These shares are owned directly by Stilwell Activist Investments, L.P. ("SAI") and indirectly by Joseph Stilwell in his capacity as the managing member and owner of Value, which is the general partner of SAI. Joseph Stilwell disclaims beneficial ownership of all shares reported as owned indirectly except to the extent of his pecuniary interest therein. These shares are owned directly by Stilwell Partners, L.P. ("SP") and indirectly by Joseph Stilwell in his capacity as the managing member and owner of Value, which is the general partner of SP. Joseph Stilwell disclaims beneficial ownership of all shares reported as owned indirectly except to the extent of his pecuniary interest therein. The reporting persons are jointly filing this statement as members of a Section 13(d) group that beneficially owns more than 10% of the issuer's common stock. /s/ Joseph Stilwell 2023-07-24 /s/ Joseph Stilwell as authorized agent for Stilwell Value LLC 2023-07-24 /s/ Joseph Stilwell as authorized agent for Stilwell Value Partners VII, L.P. 2023-07-24 /s/ Joseph Stilwell as authorized agent for Stilwell Activist Fund, L.P. 2023-07-24 /s/ Joseph Stilwell as authorized agent for Stilwell Activist Investments, L.P. 2023-07-24 /s/ Joseph Stilwell as authorized agent for Stilwell Partners, L.P. 2023-07-24