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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>As filed with the Securities and Exchange Commission on April&nbsp;3, 2015 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B>Registration No.&nbsp;333-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </B></P>
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<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="margin-top:4pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>UNITED STATES </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>SECURITIES AND EXCHANGE COMMISSION </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>WASHINGTON, D.C. 20549 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>FORM S-8
</B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>REGISTRATION STATEMENT </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B><I>UNDER </I></B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B><I>THE
SECURITIES ACT OF 1933 </I></B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:24pt; font-family:Times New Roman" ALIGN="center"><B>FIRST INTERSTATE BANCSYSTEM, INC. </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(Exact name of registrant as specified in its charter) </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top" ALIGN="center"><B>Montana</B></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top" ALIGN="center"><B>81-0331430</B></TD></TR>
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<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(State or other jurisdiction of</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>incorporation or organization)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(I.R.S. Employer</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Identification No.)</B></P></TD></TR>
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<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>401 North 31st Street</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Billings, Montana</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom" ALIGN="center"><B>59116</B></TD></TR>
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<TD VALIGN="top" ALIGN="center"><B>(Address of Principal Executive Offices)</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>(Zip Code)</B></TD></TR>
</TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>FIRST INTERSTATE BANCSYSTEM, INC. </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>2015 EQUITY AND INCENTIVE PLAN </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Full title of plan) </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Kevin P. Riley </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Executive Vice President and Chief Financial Officer </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>FIRST INTERSTATE BANCSYSTEM, INC. </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>401 North 31st Street </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Billings, Montana 59116 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Name and address of agent for service) </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(406) 255-5390 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Telephone number, including area code, of agent for service) </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>With a Copy to: </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Holland&nbsp;&amp; Hart LLP </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Attn: Gregory E. Lindley, Esq. </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>222 South Main Street, Suite 2200 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Salt Lake City, Utah 84101 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(801) 799-5800 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Indicate by check mark whether
registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of &#147;large accelerated filer,&#148; &#147;accelerated filer,&#148; and &#147;smaller reporting company&#148;
in Rule 12b-2 of the Exchange Act. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD WIDTH="60%"></TD>
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<TD VALIGN="bottom">Large&nbsp;accelerated&nbsp;filer</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">Accelerated&nbsp;filer</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#120;</FONT></TD></TR>
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<TD HEIGHT="8"></TD>
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<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
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<TD VALIGN="bottom">Non-accelerated filer</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT>&nbsp;&nbsp;(Do not check if a smaller reporting company)</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">Smaller&nbsp;reporting&nbsp;company</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD></TR>
</TABLE> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>CALCULATION OF REGISTRATION FEE </B></P> <P STYLE="font-size:4pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD WIDTH="44%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="13%"></TD>
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<TD COLSPAN="9" VALIGN="bottom"> <P STYLE="border-top:1.00px solid #000000">&nbsp;</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:8pt">
<TD VALIGN="bottom" ALIGN="center" STYLE="BORDER-TOP:1px solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Title of each class of securities</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>to be registered</B></P></TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000">&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center" STYLE="BORDER-TOP:1px solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Amount</B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>to be</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>registered&nbsp;(1)</B></P></TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000">&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center" STYLE="BORDER-TOP:1px solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Proposed</B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>maximum offering</B></P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>price per
share&nbsp;(2)</B></P></TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000">&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center" STYLE="BORDER-TOP:1px solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Proposed</B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>maximum</B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>aggregate</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>offering price&nbsp;(2)</B></P></TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000">&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center" STYLE="BORDER-TOP:1px solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Amount of</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>registration fee</B></P></TD></TR>
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<TD VALIGN="top" STYLE="BORDER-TOP:1px solid #000000"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Class A common stock, no par value</P></TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000">&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center" STYLE="BORDER-TOP:1px solid #000000">2,000,000</TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000">&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center" STYLE="BORDER-TOP:1px solid #000000">$27.67</TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000">&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center" STYLE="BORDER-TOP:1px solid #000000">$55,340,000</TD>
<TD VALIGN="bottom" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000">&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center" STYLE="BORDER-TOP:1px solid #000000">$6,431</TD></TR>
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<TD COLSPAN="9" VALIGN="bottom"> <P STYLE="border-top:1.00px solid #000000">&nbsp;</P></TD></TR>
<TR STYLE="font-size:1px; ">
<TD COLSPAN="9" VALIGN="bottom"> <P STYLE="border-top:1.00px solid #000000">&nbsp;</P></TD></TR>
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<TD WIDTH="4%" VALIGN="top" ALIGN="left">(1)</TD>
<TD ALIGN="left" VALIGN="top">Pursuant to Rule 416 under the Securities Act of 1933, as amended (the &#147;<U>Securities Act</U>&#148;), this Registration Statement also covers an indeterminate number of additional shares of the Registrant&#146;s
Class&nbsp;A common stock, no par value, which may be offered and issued to prevent dilution resulting from adjustments as a result of stock dividends, stock splits, reverse stock splits, recapitalizations, reclassifications, mergers, split-ups,
reorganizations, consolidations and other capital adjustments. </TD></TR></TABLE>
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<TD WIDTH="4%" VALIGN="top" ALIGN="left">(2)</TD>
<TD ALIGN="left" VALIGN="top">Estimated solely for the purpose of determining the registration fee in accordance with Rule 457(h) under the Securities Act based on the average of the high and low prices as reported on the Nasdaq Stock Market on
March&nbsp;31, 2015. </TD></TR></TABLE> <P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P> <P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P>
<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P>

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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>PART I </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The documents containing the information required by Part&nbsp;I of <FONT STYLE="white-space:nowrap">Form&nbsp;S-8</FONT> will be sent or
given to participants in the First Interstate BancSystem, Inc. 2015 Equity and Incentive Plan (the &#147;Plan&#148;) as specified by Rule 428(b)(1) of the Securities Act of 1933, as amended (the &#147;Securities Act&#148;). In reliance on Rule 428,
such documents (i)&nbsp;are not being filed with the Securities and Exchange Commission (the &#147;Commission&#148;) either as part of this registration statement or as prospectuses or prospectus supplements pursuant to Rule 424 of the Securities
Act, and (ii)&nbsp;along with the documents incorporated by reference into this registration statement pursuant to Item&nbsp;3 of Part II hereof, taken together, constitute a prospectus that meets the requirements of Section&nbsp;10(a) of the
Securities Act. </P> <P STYLE="margin-top:24pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>PART II </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>INFORMATION REQUIRED IN THE REGISTRATION STATEMENT </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;3. Incorporation of Documents by Reference. </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The following documents filed by the Registrant with the Commission are hereby incorporated by reference in this Registration Statement: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a)&nbsp;&nbsp;&nbsp;&nbsp;The Registrant&#146;s Annual Report on Form 10-K for the fiscal year ended December&nbsp;31, 2014 filed with the
Commission on March&nbsp;2, 2015. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b)&nbsp;&nbsp;&nbsp;&nbsp;The Registrant&#146;s definitive Proxy Statement in connection with the
solicitation of proxies for the Registrant&#146;s 2015 Annual Meeting of Stockholders filed with the Commission on April&nbsp;2, 2015. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c)&nbsp;&nbsp;&nbsp;&nbsp;The Registrant&#146;s Current Reports on Form 8-K filed with the Commission on January&nbsp;27,
2015,&nbsp;January&nbsp;22, 2015 and March&nbsp;26, 2015. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) (i)&nbsp;&nbsp;&nbsp;&nbsp;The description of the Class&nbsp;A common stock
of the Registrant contained in a registration statement on Form 8-A filed by the Registrant under Section&nbsp;12(b) of the Securities Exchange Act of 1934, as amended (the &#147;Exchange Act&#148;), on March&nbsp;9, 2010, and any amendments or
reports filed for the purpose of updating such description. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) (ii)&nbsp;&nbsp;&nbsp;&nbsp;The description of the Class B common stock of
the Registrant contained in a registration statement on Form 8-A filed by the Registrant under Section&nbsp;12(g) of the Exchange Act, on April&nbsp;15, 2002, as amended on March&nbsp;12, 2010, and any further amendments or reports filed for the
purpose of updating such description. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">All documents filed subsequent hereto by the Registrant, pursuant to Sections 13(a), 13(c), 14 and
15(d) of the Exchange Act, prior to the filing of a post-effective amendment which indicates that all of the Registrant&#146;s common stock offered hereby has been sold or which deregisters all of the Registrant&#146;s common stock then remaining
unsold, shall be deemed to be incorporated in this Registration Statement by reference and shall be a part hereof from the date of filing such documents. Any statement contained in a document incorporated or deemed to be incorporated by reference in
this Registration Statement shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be
incorporated by reference in this Registration Statement modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or so superseded, to constitute a part of this Registration
Statement. </P> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;4. Description of Securities. </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Not Applicable. </P> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;5. Interests of Named Experts and
Counsel. </B></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Not Applicable. </P> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;6.
Indemnification of Officers and Directors. </B></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Sections 35-1-451 through 35-1-459 of the Montana Business Corporation Act (the
&#147;Montana Act&#148;) provide that a corporation may indemnify its directors and officers. In general, the Montana Act provides that a corporation must indemnify a director or officer who is wholly successful in his defense of a proceeding to
which he is a party because of his status as a director or officer, unless limited by the articles of incorporation. Pursuant to the Montana Act, a corporation may indemnify a director or officer, if it is determined that the director engaged in
good faith and meets certain standards of conduct. A corporation may not indemnify a director or officer under the Montana Act when a director is adjudged liable to the </P>

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corporation, or when such person is adjudged liable on the basis that personal benefit was improperly received. The Montana Act also permits a director or officer of a corporation, who is a party
to a proceeding, to apply to the courts for indemnification or advancement of expenses, unless the articles of incorporation provide otherwise and the court may order indemnification or advancement of expenses under certain circumstances. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Our bylaws provide for the indemnification of directors and officers, including (i)&nbsp;the mandatory indemnification of a director or
officer who was wholly successful, on the merits or otherwise, in the defense of any proceeding, (ii)&nbsp;the permissible indemnification of directors and officers if a determination to indemnify such person has been made as prescribed by the
Montana Act and (iii)&nbsp;for the reimbursement of reasonable expenses incurred by a director or officer who is party to a proceeding in advance of final disposition of the proceeding, if the determination to indemnify has been made pursuant to the
Montana Act. We have also obtained officers&#146; and directors&#146; liability insurance which insures against liabilities that officers and directors may, in such capacities, incur. Section&nbsp;35-1-458 of the Montana Act provides that a
corporation may purchase and maintain insurance on behalf of director or officer of the corporation against liability asserted or incurred against such director or officer, while serving at the request of the corporation in such capacity, or arising
from the individual&#146;s status as a director or officer, whether or not the corporation would have power to indemnify the individual against the same liability under the Montana Act. </P>
<P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;7. Exemption for Registration Claimed. </B></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Not
Applicable. </P> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;8. Exhibits. </B></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The Exhibit
Index is hereby incorporated by reference. </P> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;9. Undertakings. </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The undersigned Company hereby undertakes: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(1)&nbsp;&nbsp;&nbsp;&nbsp;To file, during any period in which offers or sales are being made, a post-effective amendment to this registration
statement:</P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i)&nbsp;&nbsp;&nbsp;&nbsp;to include any prospectus required by section&nbsp;10(a)(3)&nbsp;of the Securities
Act;</P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) &nbsp;&nbsp;&nbsp;&nbsp;to reflect in the prospectus any facts or events arising after the effective date of the
registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any
increase or decrease in volume of securities offered (if total dollar value securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the
form of prospectus filed with the Commission pursuant to Rule&nbsp;424(b)&nbsp;under the Securities Act if, in the aggregate, the changes in volume and price represent not more than 20% change in the maximum aggregate offering price set forth in the
&#147;Calculation of Registration Fee&#148; table in the effective registration statement; and </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iii)&nbsp;&nbsp;&nbsp;&nbsp;to include any material information with respect to the plan of distribution not previously
disclosed in the registration statement or any material change to such information in the registration statement; provided, however, that paragraphs (1)(i)&nbsp;and (1)(ii)&nbsp;do not apply if the information required to be included in a
post-effective amendment by those paragraphs is contained in periodic reports filed with or furnished to the Commission by the Company pursuant to Section&nbsp;13 or Section&nbsp;15(d)&nbsp;of the Exchange Act that are incorporated by reference
herein.</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(2)&nbsp;&nbsp;&nbsp;&nbsp;That, for the purpose of determining any liability under the Securities Act, each such post-effective
amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.</P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(3)&nbsp;&nbsp;&nbsp;&nbsp;To remove from registration by means of a post-effective amendment any of the securities being registered which
remain unsold at the termination of the offering.</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Company hereby undertakes that, for purposes of determining any liability under the
Securities Act, each filing of the Company&#146;s annual report pursuant to Section&nbsp;13(a)&nbsp;or Section&nbsp;15(d)&nbsp;of the Exchange Act (and, where applicable, each filing of an employee benefit plan&#146;s annual report pursuant to
Section&nbsp;15(d)&nbsp;of the Exchange Act) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that
time shall be deemed to be the initial bona fide offering thereof. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers and controlling persons of the Company pursuant to the foregoing provisions, or otherwise, the Company has been advised that in </P>

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the opinion of the Commission such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Company of expenses incurred or paid by a director, officer or controlling person of the Company in the successful defense of any action, suit or proceeding) is asserted by such director,
officer or controlling person in connection with the securities being registered, the Company will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question
whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue. </P>
<P STYLE="margin-top:24pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>SIGNATURES </B></P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to
the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Billings, State of Montana, on April&nbsp;3, 2015. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
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<TD VALIGN="top" COLSPAN="3">First Interstate BancSystem, Inc.</TD></TR>
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<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
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<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom" STYLE="BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="top" STYLE="BORDER-BOTTOM:1px solid #000000">/s/ ED GARDING</TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom">Ed Garding</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom">President and Chief Executive Officer</TD></TR>
</TABLE></DIV> <P STYLE="margin-top:24pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>POWER OF ATTORNEY </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature to this Registration Statement appears below hereby constitutes and
appoints Ed Garding and Kevin P. Riley, and each of them, as his or her true and lawful attorney-in-fact and agent, with full power of substitution, to sign on his or her behalf individually and in the capacity stated below, and to perform any acts
necessary to be done in order to file all amendments and post-effective amendments to this Registration Statement, and any and all instruments or documents filed as part of or in connection with this Registration Statement or the amendments thereto
and each of the undersigned does hereby ratify and confirm all that such attorney-in-fact and agent, or his substitutes, shall do or cause to be done by virtue hereof. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the
date indicated. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="bottom" NOWRAP ALIGN="center"> <P STYLE="border-bottom:1.00pt solid #000000; width:33.30pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Signature</B></P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center"> <P STYLE="border-bottom:1.00pt solid #000000; width:15.95pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Title</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center"> <P STYLE="border-bottom:1.00pt solid #000000; width:16.00pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Date</B></P></TD></TR>


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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Thomas W. Scott</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Thomas W. Scott</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Chairman of the Board</P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ James R. Scott</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">James R. Scott</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Executive Vice Chairman of the Board</P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Steven J. Corning</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Steven J. Corning</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Dana L. Crandall</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Dana L. Crandall</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
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<TD HEIGHT="16" COLSPAN="2"></TD>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ David H. Crum</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">David H. Crum</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ William B. Ebzery</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">William B. Ebzery</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Charles E. Hart, M.D., M.S.</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Charles E. Hart, M.D., M.S.</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
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<TD HEIGHT="16" COLSPAN="2"></TD>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Charles M. Heyneman</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Charles M. Heyneman</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR></TABLE>

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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ John M. Heyneman, Jr.</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">John M. Heyneman, Jr.</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ David L. Jahnke</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">David L. Jahnke</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Ross E. Leckie</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Ross E. Leckie</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Jonathan R. Scott</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Jonathan R. Scott</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Randall I. Scott</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Randall I. Scott</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom"></TD>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Michael J. Sullivan</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Michael J. Sullivan</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom"></TD>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Teresa A. Taylor</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Teresa A. Taylor</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Theodore H. Williams</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Theodore H. Williams</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top"> <P STYLE="margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Director</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Ed Garding</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Ed Garding</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">President, Chief Executive Officer</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">and Director (Principal executive officer)</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Kevin P. Riley</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Kevin P. Riley</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Executive Vice President and Chief</P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Financial Officer (Principal financial and</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">accounting officer)</P></TD>
<TD VALIGN="bottom"></TD>
<TD VALIGN="top" NOWRAP ALIGN="center">April 3, 2015</TD></TR>
</TABLE>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>FIRST INTERSTATE BANCSYSTEM, INC. </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>EXHIBIT INDEX </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" ALIGN="center">


<TR>
<TD></TD>
<TD VALIGN="bottom" WIDTH="10%"></TD>
<TD WIDTH="87%"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:8pt">
<TD VALIGN="bottom" NOWRAP ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Regulation&nbsp;S-K</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1.00pt solid #000000; width:52.60pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Exhibit</B></P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" ALIGN="center"> <P STYLE="border-bottom:1.00pt solid #000000; width:35.10pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Document</B></P></TD></TR>


<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>&nbsp;&nbsp;4.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Amended and Restated Articles of Incorporation dated March&nbsp;5, 2010 (incorporated herein by reference to Exhibit 3.1 of the Company&#146;s Current Report on Form 8-K/A filed on March&nbsp;10, 2010).</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>&nbsp;&nbsp;4.2</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Second Amended and Restated Bylaws dated January&nbsp;27, 2011 (incorporated herein by reference to Exhibit 3.8 of the Company&#146;s Current Report on Form 8-K filed on February&nbsp;3, 2011).</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>&nbsp;&nbsp;4.3</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">First Interstate BancSystem, Inc. 2015 Equity and Incentive Plan (incorporated herein by reference to Appendix A of the Company&#146;s Proxy Statement on Schedule 14A for the 2015 Annual Meeting of Shareholders, filed on
April&nbsp;2, 2015).</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>&nbsp;&nbsp;5.1*</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Opinion of Holland &amp; Hart LLP as to the legality of securities being offered.</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>23.1*</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Consent of McGladrey LLP, Independent Registered Public Accounting Firm.</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>23.2*</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Consent of Holland &amp; Hart LLP (included in Exhibit&nbsp;5.1).</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>24*</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Power of Attorney (included on page&nbsp;4 of this Registration Statement).</TD></TR>
</TABLE> <P STYLE="line-height:8.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000;width:10%">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="2%" VALIGN="top" ALIGN="left">*</TD>
<TD ALIGN="left" VALIGN="top">Filed herewith. </TD></TR></TABLE>
</BODY></HTML>
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S-8
As filed with the Securities and Exchange Commission on April 3, 2015
Registration No. 333-
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM S-8
REGISTRATION STATEMENT
UNDER
THE
SECURITIES ACT OF 1933
FIRST INTERSTATE BANCSYSTEM, INC.
(Exact name of registrant as specified in its charter)
Montana
81-0331430
(State or other jurisdiction of
incorporation or organization)
(I.R.S. Employer
Identification No.)
401 North 31st Street
Billings, Montana
59116
(Address of Principal Executive Offices)
(Zip Code)
FIRST INTERSTATE BANCSYSTEM, INC.
2015 EQUITY AND INCENTIVE PLAN
(Full title of plan)
Kevin P. Riley
Executive Vice President and Chief Financial Officer
FIRST INTERSTATE BANCSYSTEM, INC.
401 North 31st Street
Billings, Montana 59116
(Name and address of agent for service)
(406) 255-5390
(Telephone number, including area code, of agent for service)
With a Copy to:
Holland & Hart LLP
Attn: Gregory E. Lindley, Esq.
222 South Main Street, Suite 2200
Salt Lake City, Utah 84101
(801) 799-5800
Indicate by check mark whether
registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of "large accelerated filer," "accelerated filer," and "smaller reporting company"
in Rule 12b-2 of the Exchange Act.
Large accelerated filer
¨
Accelerated filer
x
Non-accelerated filer
¨
(Do not check if a smaller reporting company)
Smaller reporting company
¨
CALCULATION OF REGISTRATION FEE
Title of each class of securities
to be registered
Amount
to be
registered (1)
Proposed
maximum offering
price per
share (2)
Proposed
maximum
aggregate
offering price (2)
Amount of
registration fee
Class A common stock, no par value
2,000,000
$27.67
$55,340,000
$6,431
(1)
Pursuant to Rule 416 under the Securities Act of 1933, as amended (the "
Securities Act
"), this Registration Statement also covers an indeterminate number of additional shares of the Registrant's
Class A common stock, no par value, which may be offered and issued to prevent dilution resulting from adjustments as a result of stock dividends, stock splits, reverse stock splits, recapitalizations, reclassifications, mergers, split-ups,
reorganizations, consolidations and other capital adjustments.
(2)
Estimated solely for the purpose of determining the registration fee in accordance with Rule 457(h) under the Securities Act based on the average of the high and low prices as reported on the Nasdaq Stock Market on
March 31, 2015.
PART I
INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
The documents containing the information required by Part I of
Form S-8
will be sent or
given to participants in the First Interstate BancSystem, Inc. 2015 Equity and Incentive Plan (the "Plan") as specified by Rule 428(b)(1) of the Securities Act of 1933, as amended (the "Securities Act"). In reliance on Rule 428,
such documents (i) are not being filed with the Securities and Exchange Commission (the "Commission") either as part of this registration statement or as prospectuses or prospectus supplements pursuant to Rule 424 of the Securities
Act, and (ii) along with the documents incorporated by reference into this registration statement pursuant to Item 3 of Part II hereof, taken together, constitute a prospectus that meets the requirements of Section 10(a) of the
Securities Act.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
The following documents filed by the Registrant with the Commission are hereby incorporated by reference in this Registration Statement:
(a)    The Registrant's Annual Report on Form 10-K for the fiscal year ended December 31, 2014 filed with the
Commission on March 2, 2015.
(b)    The Registrant's definitive Proxy Statement in connection with the
solicitation of proxies for the Registrant's 2015 Annual Meeting of Stockholders filed with the Commission on April 2, 2015.
(c)    The Registrant's Current Reports on Form 8-K filed with the Commission on January 27,
2015, January 22, 2015 and March 26, 2015.
(e) (i)    The description of the Class A common stock
of the Registrant contained in a registration statement on Form 8-A filed by the Registrant under Section 12(b) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), on March 9, 2010, and any amendments or
reports filed for the purpose of updating such description.
(e) (ii)    The description of the Class B common stock of
the Registrant contained in a registration statement on Form 8-A filed by the Registrant under Section 12(g) of the Exchange Act, on April 15, 2002, as amended on March 12, 2010, and any further amendments or reports filed for the
purpose of updating such description.
All documents filed subsequent hereto by the Registrant, pursuant to Sections 13(a), 13(c), 14 and
15(d) of the Exchange Act, prior to the filing of a post-effective amendment which indicates that all of the Registrant's common stock offered hereby has been sold or which deregisters all of the Registrant's common stock then remaining
unsold, shall be deemed to be incorporated in this Registration Statement by reference and shall be a part hereof from the date of filing such documents. Any statement contained in a document incorporated or deemed to be incorporated by reference in
this Registration Statement shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be
incorporated by reference in this Registration Statement modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or so superseded, to constitute a part of this Registration
Statement.
Item 4. Description of Securities.
Not Applicable.
Item 5. Interests of Named Experts and
Counsel.
Not Applicable.
Item 6.
Indemnification of Officers and Directors.
Sections 35-1-451 through 35-1-459 of the Montana Business Corporation Act (the
"Montana Act") provide that a corporation may indemnify its directors and officers. In general, the Montana Act provides that a corporation must indemnify a director or officer who is wholly successful in his defense of a proceeding to
which he is a party because of his status as a director or officer, unless limited by the articles of incorporation. Pursuant to the Montana Act, a corporation may indemnify a director or officer, if it is determined that the director engaged in
good faith and meets certain standards of conduct. A corporation may not indemnify a director or officer under the Montana Act when a director is adjudged liable to the
corporation, or when such person is adjudged liable on the basis that personal benefit was improperly received. The Montana Act also permits a director or officer of a corporation, who is a party
to a proceeding, to apply to the courts for indemnification or advancement of expenses, unless the articles of incorporation provide otherwise and the court may order indemnification or advancement of expenses under certain circumstances.
Our bylaws provide for the indemnification of directors and officers, including (i) the mandatory indemnification of a director or
officer who was wholly successful, on the merits or otherwise, in the defense of any proceeding, (ii) the permissible indemnification of directors and officers if a determination to indemnify such person has been made as prescribed by the
Montana Act and (iii) for the reimbursement of reasonable expenses incurred by a director or officer who is party to a proceeding in advance of final disposition of the proceeding, if the determination to indemnify has been made pursuant to the
Montana Act. We have also obtained officers' and directors' liability insurance which insures against liabilities that officers and directors may, in such capacities, incur. Section 35-1-458 of the Montana Act provides that a
corporation may purchase and maintain insurance on behalf of director or officer of the corporation against liability asserted or incurred against such director or officer, while serving at the request of the corporation in such capacity, or arising
from the individual's status as a director or officer, whether or not the corporation would have power to indemnify the individual against the same liability under the Montana Act.
Item 7. Exemption for Registration Claimed.
Not
Applicable.
Item 8. Exhibits.
The Exhibit
Index is hereby incorporated by reference.
Item 9. Undertakings.
The undersigned Company hereby undertakes:
(1)    To file, during any period in which offers or sales are being made, a post-effective amendment to this registration
statement:
(i)    to include any prospectus required by section 10(a)(3) of the Securities
Act;
(ii)     to reflect in the prospectus any facts or events arising after the effective date of the
registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any
increase or decrease in volume of securities offered (if total dollar value securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the
form of prospectus filed with the Commission pursuant to Rule 424(b) under the Securities Act if, in the aggregate, the changes in volume and price represent not more than 20% change in the maximum aggregate offering price set forth in the
"Calculation of Registration Fee" table in the effective registration statement; and
(iii)    to include any material information with respect to the plan of distribution not previously
disclosed in the registration statement or any material change to such information in the registration statement; provided, however, that paragraphs (1)(i) and (1)(ii) do not apply if the information required to be included in a
post-effective amendment by those paragraphs is contained in periodic reports filed with or furnished to the Commission by the Company pursuant to Section 13 or Section 15(d) of the Exchange Act that are incorporated by reference
herein.
(2)    That, for the purpose of determining any liability under the Securities Act, each such post-effective
amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.
(3)    To remove from registration by means of a post-effective amendment any of the securities being registered which
remain unsold at the termination of the offering.
The Company hereby undertakes that, for purposes of determining any liability under the
Securities Act, each filing of the Company's annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit plan's annual report pursuant to
Section 15(d) of the Exchange Act) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that
time shall be deemed to be the initial bona fide offering thereof.
Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers and controlling persons of the Company pursuant to the foregoing provisions, or otherwise, the Company has been advised that in
the opinion of the Commission such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Company of expenses incurred or paid by a director, officer or controlling person of the Company in the successful defense of any action, suit or proceeding) is asserted by such director,
officer or controlling person in connection with the securities being registered, the Company will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question
whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.
SIGNATURES
Pursuant to
the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Billings, State of Montana, on April 3, 2015.
First Interstate BancSystem, Inc.
By:
/s/ ED GARDING
Ed Garding
President and Chief Executive Officer
POWER OF ATTORNEY
KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature to this Registration Statement appears below hereby constitutes and
appoints Ed Garding and Kevin P. Riley, and each of them, as his or her true and lawful attorney-in-fact and agent, with full power of substitution, to sign on his or her behalf individually and in the capacity stated below, and to perform any acts
necessary to be done in order to file all amendments and post-effective amendments to this Registration Statement, and any and all instruments or documents filed as part of or in connection with this Registration Statement or the amendments thereto
and each of the undersigned does hereby ratify and confirm all that such attorney-in-fact and agent, or his substitutes, shall do or cause to be done by virtue hereof.
Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the
date indicated.
Signature
Title
Date
/s/ Thomas W. Scott
Thomas W. Scott
Chairman of the Board
April 3, 2015
/s/ James R. Scott
James R. Scott
Executive Vice Chairman of the Board
April 3, 2015
/s/ Steven J. Corning
Steven J. Corning
Director
April 3, 2015
/s/ Dana L. Crandall
Dana L. Crandall
Director
April 3, 2015
/s/ David H. Crum
David H. Crum
Director
April 3, 2015
/s/ William B. Ebzery
William B. Ebzery
Director
April 3, 2015
/s/ Charles E. Hart, M.D., M.S.
Charles E. Hart, M.D., M.S.
Director
April 3, 2015
/s/ Charles M. Heyneman
Charles M. Heyneman
Director
April 3, 2015
/s/ John M. Heyneman, Jr.
John M. Heyneman, Jr.
Director
April 3, 2015
/s/ David L. Jahnke
David L. Jahnke
Director
April 3, 2015
/s/ Ross E. Leckie
Ross E. Leckie
Director
April 3, 2015
/s/ Jonathan R. Scott
Jonathan R. Scott
Director
April 3, 2015
/s/ Randall I. Scott
Randall I. Scott
Director
April 3, 2015
/s/ Michael J. Sullivan
Michael J. Sullivan
Director
April 3, 2015
/s/ Teresa A. Taylor
Teresa A. Taylor
Director
April 3, 2015
/s/ Theodore H. Williams
Theodore H. Williams
Director
April 3, 2015
/s/ Ed Garding
Ed Garding
President, Chief Executive Officer
and Director (Principal executive officer)
April 3, 2015
/s/ Kevin P. Riley
Kevin P. Riley
Executive Vice President and Chief
Financial Officer (Principal financial and
accounting officer)
April 3, 2015
FIRST INTERSTATE BANCSYSTEM, INC.
EXHIBIT INDEX
Regulation S-K
Exhibit
Document
4.1
Amended and Restated Articles of Incorporation dated March 5, 2010 (incorporated herein by reference to Exhibit 3.1 of the Company's Current Report on Form 8-K/A filed on March 10, 2010).
4.2
Second Amended and Restated Bylaws dated January 27, 2011 (incorporated herein by reference to Exhibit 3.8 of the Company's Current Report on Form 8-K filed on February 3, 2011).
4.3
First Interstate BancSystem, Inc. 2015 Equity and Incentive Plan (incorporated herein by reference to Appendix A of the Company's Proxy Statement on Schedule 14A for the 2015 Annual Meeting of Shareholders, filed on
April 2, 2015).
5.1*
Opinion of Holland & Hart LLP as to the legality of securities being offered.
23.1*
Consent of McGladrey LLP, Independent Registered Public Accounting Firm.
23.2*
Consent of Holland & Hart LLP (included in Exhibit 5.1).
24*
Power of Attorney (included on page 4 of this Registration Statement).
*
Filed herewith.