<ACCESSION-NUMBER>0000932471-19-005218 <TYPE>SC 13G/A <PUBLIC-DOCUMENT-COUNT>1 <FILING-DATE>20190211 <DATE-OF-FILING-DATE-CHANGE>20190211 <SUBJECT-COMPANY> <COMPANY-DATA> <CONFORMED-NAME>FIRST INTERSTATE BANCSYSTEM INC <CIK>0000860413 <ASSIGNED-SIC>6022 <IRS-NUMBER>810331430 <STATE-OF-INCORPORATION>MT <FISCAL-YEAR-END>1231 </COMPANY-DATA> <FILING-VALUES> <FORM-TYPE>SC 13G/A <ACT>34 <FILE-NUMBER>005-78756 <FILM-NUMBER>19584368 </FILING-VALUES> <BUSINESS-ADDRESS> <STREET1>P O BOX 30918 <STREET2>401 NO 31ST STREET <CITY>BILLINGS <STATE>MT <ZIP>59116-0918 <PHONE>4062555300 </BUSINESS-ADDRESS> <MAIL-ADDRESS> <STREET1>P O BOX 30918 <STREET2>401 NO 31ST STREET <CITY>BILLINGS <STATE>MT <ZIP>59116-0918 </MAIL-ADDRESS> <FORMER-COMPANY> <FORMER-CONFORMED-NAME>FIRST INTERSTATE BANCSYSTEM OF MONTANA INC <DATE-CHANGED>19930615 </FORMER-COMPANY> </SUBJECT-COMPANY> <FILED-BY> <COMPANY-DATA> <CONFORMED-NAME>VANGUARD GROUP INC <CIK>0000102909 <IRS-NUMBER>231945930 <STATE-OF-INCORPORATION>PA <FISCAL-YEAR-END>1231 </COMPANY-DATA> <FILING-VALUES> <FORM-TYPE>SC 13G/A </FILING-VALUES> <BUSINESS-ADDRESS> <STREET1>PO BOX 2600 <STREET2>V26 <CITY>VALLEY FORGE <STATE>PA <ZIP>19482-2600 <PHONE>6106691000 </BUSINESS-ADDRESS> <MAIL-ADDRESS> <STREET1>PO BOX 2600 <STREET2>V26 <CITY>VALLEY FORGE <STATE>PA <ZIP>19482-2600 </MAIL-ADDRESS> </FILED-BY>