try the below array formula:

A9 =IFERROR(INDEX(STS!A:A,SMALL(IF(STS!C:C=$C$4,ROW(INDIRECT("1:"&ROWS(STS!A:A)))),1)),"") ---- CRTL+SHIFT+ENTER
A11 =IFERROR(INDEX(STS!A:A,SMALL(IF(STS!C:C=$C$4,ROW(INDIRECT("1:"&ROWS(STS!A:A)))),2)),"") ---- CRTL+SHIFT+ENTER
A13 =IFERROR(INDEX(STS!A:A,SMALL(IF(STS!C:C=$C$4,ROW(INDIRECT("1:"&ROWS(STS!A:A)))),3)),"") ---- CRTL+SHIFT+ENTER