Item 8.01. Other Events.





As previously announced, on September 15, 2021, Great Western Bancorp, Inc., a
Delaware corporation ("Great Western") entered into an Agreement and Plan of
Merger (as amended from time to time, the "Merger Agreement") with First
Interstate BancSystem, Inc., a Montana corporation ("First Interstate"). The
Merger Agreement provides that, upon the terms and subject to the conditions set
forth therein, Great Western will merge with and into First Interstate (the
"Merger"), with First Interstate continuing as the surviving corporation in the
Merger. The Merger Agreement was unanimously approved by the board of directors
of each of Great Western and First Interstate.

In connection with the Merger, First Interstate filed with the U.S. Securities
and Exchange Commission (the "SEC") a registration statement on Form S-4
containing a joint proxy statement/prospectus, as amended, and each of Great
Western and First Interstate filed a definitive joint proxy statement/prospectus
with the SEC dated December 16, 2021 (the "Proxy Statement"), which Great
Western and First Interstate first mailed to their stockholders and
shareholders, respectively, on or about December 16, 2021.

Following the announcement of the Merger Agreement, as of the date of this
Current Report on Form 8-K, a complaint (the "Complaint"), captioned Laidlaw v.
Borrecco et al., No. 49CIV21-003213, was filed by a purported stockholder of
Great Western in the Circuit Court of the 2nd Judicial District, Minnehaha
County, South Dakota. In addition, Great Western received demand letters from
counsel representing individual stockholders of Great Western (the "Demand
Letters" and, together with the Complaint, the "Matters"). The Matters allege,
among other things, that the defendants caused a materially incomplete and
misleading Proxy Statement relating to the Merger to be filed with the SEC in
violation of certain state securities laws, Sections 14(a) and 20(a) of the
Securities Exchange Act of 1934, as amended and Rule 14a-9 promulgated
thereunder, and/or in breach of their fiduciary obligations under state law.

Great Western and First Interstate believe the claims asserted in the Matters
are without merit and supplemental disclosures are not required or necessary
under applicable laws. However, in order to avoid the risk that the Matters
delay or otherwise adversely affect the Merger, and to minimize the costs, risks
and uncertainties inherent in litigation, and without admitting any liability or
wrongdoing, Great Western and First Interstate have agreed to supplement the
Proxy Statement as described in this Current Report on Form 8-K. Great Western,
First Interstate and the other named defendants deny that they have violated any
laws or breached any duties to Great Western's stockholders or First
Interstate's shareholders, as applicable. Nothing in this Current Report on Form
8-K shall be deemed an admission of the legal necessity or materiality under
applicable laws of any of the disclosures set forth herein. To the contrary,
Great Western and First Interstate specifically deny all allegations in the
Matters that any additional disclosure was or is required.

The additional disclosures in this Current Report on Form 8-K supplement the
disclosures contained in the Proxy Statement and should be read in conjunction
with the Proxy Statement, which should be read in its entirety. To the extent
that information herein differs from or updates information contained in the
Proxy Statement, the information contained herein supersedes the information
contained in the Proxy Statement. All page references are to pages in the Proxy
Statement, and defined terms used but not defined herein have the meanings set
forth in the Proxy Statement.

1. The risk factor entitled "Holders of Great Western common stock will have a

reduced ownership and voting interest in the surviving corporation after the

merger and will exercise less influence over management" on page 41 of the

Proxy Statement under the heading "Risk Factors" is amended and restated as


   follows:



Holders of First Interstate Class A common stock and Great Western common stock
currently have the right to vote in the election of the board of directors and
on other matters affecting First Interstate and Great Western, respectively.
When the merger is completed, each holder of Great Western common stock who
receives shares of First Interstate Class A common stock will become a holder of
common stock of the surviving corporation, with a percentage ownership of the
surviving corporation that is smaller than the holder's percentage ownership of
Great Western. Based on the number of shares of First Interstate common stock
and Great Western common stock outstanding as of the close of business on the
respective record dates, and based on the number of shares of First Interstate
Class A common stock expected to be issued in the merger, the former holders of
Great Western common stock, as a group, are estimated to own approximately
forty-three percent (43%) of the fully diluted shares of the surviving
corporation immediately after the merger and current holders of First Interstate
common stock as a group are estimated to own approximately fifty-seven percent
(57%) of the fully diluted shares of the surviving corporation immediately after
the merger (such percentage is inclusive of approximately eighteen and one-half
percent (18.5%) of the fully diluted shares of the surviving corporation
immediately after the merger that the Scott Family shareholders are estimated to
own following the merger and the contemplated conversion of First Interstate
Class B common stock into First Interstate Class A common stock). Because of
this, holders of Great Western common stock may have less influence on the
management and policies of the surviving corporation than they now have on the
management and policies of Great Western.

                                       2

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2. The second full paragraph on page 64 of the Proxy Statement under the heading

"The Merger-Background of the Merger" is amended and restated as follows:





On May 5, 2021, Great Western and First Interstate entered into a mutual
nondisclosure agreement in order to facilitate further discussions, and in early
May, Messrs. Borrecco and Riley had exploratory conversations in which they
discussed, at a high level, their respective businesses, organizational
structures and performance. Also in May, Great Western entered into a mutual
nondisclosure agreement with Company A, and Mr. Borrecco and the Chief Executive
Officer of Company A had exploratory conversations in which they discussed, at a
high level, their respective businesses, organizational structures and
performance. The nondisclosure agreements with First Interstate and Company A
contain customary obligations to preserve the confidentiality of information
provided by each party and do not include "don't ask, don't waive" provisions.
The nondisclosure agreement with Company A includes a customary mutual
standstill provision that, for a period of eighteen months, prohibits both Great
Western and Company A from, among other things, making a proposal to acquire or
engage in a merger or business combination with the other party without the
other party's prior written consent. At no point in the course of the
negotiations during this period relating to the merger did Great Western enter
into a confidentiality, standstill or similar agreement with any other potential
counterparty related to a potential strategic business combination transaction
other than Company A and First Interstate.

3. The second full paragraph on page 70 of the Proxy Statement under the heading

"The Merger-Background of the Merger" is amended and restated as follows:





On August 29, 2021, the Great Western board held a special meeting, which
members of Great Western management and representatives of Wachtell Lipton and
Piper Sandler also attended. At the meeting, Mr. Brannen updated the Great
Western board, based on his discussions with Mr. Jahnke, regarding the proposed
stockholders' agreement terms under discussion between First Interstate and the
Scott Family shareholders and the proposed governance of the surviving
corporation, including, in the event definitive transaction terms were agreed,
the possibility of having a member of the Great Western board serve as a member
of the Executive Committee of the surviving corporation. Members of Great
Western management then updated the Great Western directors on the status of the
mutual due diligence process that was nearing completion, including the results
of Great Western management's reverse due diligence review of First Interstate,
with the assistance of Great Western's advisors. A representative of Wachtell
Lipton also reviewed with the directors their fiduciary duties in connection
with the potential transaction, as he had previously done, and reviewed with the
directors First Interstate's existing corporate governance structure. In
addition, a representative of Piper Sandler reviewed with the Great Western
board movements in the relative market prices of both Great Western and First
Interstate shares since the execution of the July 30 IOI, and discussed with the
Great Western board the substantial increase in the implied premium to Great
Western's stockholders that would result from those price movements based on the
exchange ratio reflected in the July 30 IOI. Following discussion, the Great
Western board expressed its support for the parties to continue due diligence
and negotiation of definitive transaction terms.

4. The fourth full paragraph on page 71 of the Proxy Statement under the heading

"The Merger-Background of the Merger" is amended and restated as follows:





On September 13, 2021, the Great Western board held a special meeting, which
members of Great Western management and representatives of Wachtell Lipton and
Piper Sandler also attended. At the meeting, Great Western management provided
an update on the completion of the parties' mutual due diligence review and the
proposed terms of the potential transaction, including the proposed final
exchange ratio of 0.8425 shares of First Interstate Class A common stock per
share of Great Western common stock. A representative of Piper Sandler reviewed
Piper Sandler's financial analyses of the proposed transaction with First
Interstate and reviewed with the Great Western board Great Western management's
current forecasts reflected in Great Western's stand-alone plan. A
representative of Wachtell Lipton then reviewed with the Great Western board the
terms of the draft merger agreement, including the proposed charter and bylaw
amendments of First Interstate provided for in the merger agreement, as well as
the terms of the other transaction documents that were anticipated to be entered
into in connection with the transaction, including the support agreement among
the Scott Family shareholders and the stockholders' agreement among First
Interstate and the Scott Family shareholders, and reviewed with the independent
directors the preliminary draft term sheet that First Interstate had provided to
Mr. Borrecco for discussion purposes regarding his appointment as Chief Banking
Officer of the combined company and Piper Sandler's relationship disclosures
regarding the financial advice and services provided by Piper Sandler to Great
Western and First Interstate during the past two years. During the meeting, the
Great Western board engaged in further discussions regarding the benefits of the
proposed transaction with First Interstate relative to Great Western's available
alternatives, including its stand-alone plan and the risks and uncertainties
associated with the stand-alone plan in the current environment. Following
discussion, the Great Western board unanimously expressed the view that the
proposed transaction with First Interstate offered greater benefits to Great
Western and its stockholders, with reduced risks, as compared to Great Western's
available alternatives, and unanimously authorized Great Western management to
move forward with negotiating the transaction on the terms described to the
Great Western board and to seek to finalize negotiations with First Interstate
as promptly as practicable.

                                       3

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5. The table entitled "Great Western Comparable Company Analysis" on page 81 of

the Proxy Statement under the heading "The Merger-Opinion of Great Western's


   Financial Advisor-Comparable Company Analyses" is amended and restated as
   follows:



                                                                                                                                                                      Great     Great     Great     Great
                                              Heartland                                                                                                              Western   Western   Western   Western
                             Independent Bk   Financial                     First                          First      First      First                  Enterprise    Peer      Peer      Peer      Peer
                   Great         Group           USA         Hilltop      

Financial International Merchants Busey Financial BancFirst

Financial Group Group Group Group Company

           Western         Inc.          Inc.      Holdings Inc.   

Bancorp. Bancshares Corp. Corp. Corp. Bankshares Corp.


   Services    Median     Mean       Low      High

Market Cap.
($mm)                1,548            2,820       1,948           2,552       2,126              2,525       2,098     1,276        6,157       1,782  

1,665 2,112 2,495 1,276 6,157 Price / TBV (%) 134

              192         136             117         168                126         161       133          442         185  

161 161 182 117 442 Price / LTM EPS (x)

                    9.6             11.9         9.6             5.5        11.6               10.8        11.3       9.9         27.7        12.3   

11.1 11.2 12.2 5.5 27.7 Price / 2021E EPS (x)

                8.1             12.4         9.1             7.9        10.5                  -        10.3      10.0         28.2        10.8   

9.8 10.3 12.1 7.9 28.2 Price / 2022E EPS (x)

               10.0             13.2         9.8            12.6        12.6                  -        11.1      11.2         30.2        15.8         10.5      12.6      14.1       9.8      30.2
Current
Dividend Yield
(%)                    0.7              2.1         2.2             1.5         4.1                3.0         3.0       4.1          1.4         2.6          1.8       2.4       2.6       1.4       4.1
Total Assets
($mm)               13,070           18,448      18,371          17,665      16,038             15,311      14,923    12,415       12,329      11,015       10,347    15,117    14,686    10,347    18,448
Loans /
Deposits (%)          73.5             82.8        64.1            65.2        76.1               62.2        74.7      69.5         54.2        63.6         83.6      67.3      69.6      54.2      83.6
Non-performing
Assets
("NPAs")(1) /
Total Assets
(%)                   2.01             0.29        0.44            0.51        0.62               0.55        0.39      0.27         0.24        0.67         0.42      0.43      0.44      0.24      0.67
Loan Loss
Reserves /
Loans (%)             3.19             1.24        1.20            1.09        1.67               1.47        2.19      1.32         1.16        1.35         1.77      1.34      1.45      1.09      2.19
Net Charge-offs
/ Average Loans
(%)                   0.25             0.13        0.12            0.02        0.23               0.07        0.06      0.06       (0.02)        0.27         0.05      0.06      0.10    (0.02)      0.27
Tangible Common
Equity ("TCE")
/ Tangible
Assets ("TA")
(%)                   8.85             8.45        8.08           12.57        8.46              13.33        9.04      8.00        11.68        8.87         8.32      8.67      9.68      8.00     13.33
Total
Risk-Based
Capital ("RBC")
Ratio (%)            15.96            14.23       15.04           23.48       15.31              21.75       14.23     16.41        21.12       17.35        14.95     15.86     17.39     14.23     23.48
Most Recent
Quarter ("MRQ")
Return on
Average Assets
("ROAA") (%)       1.80(2)             1.27        1.35            2.29        1.26               2.45        1.51      1.04         1.88        1.78         1.49      1.50      1.63      1.04      2.45
MRQ Return on
Average
Tangible Common
Equity
("ROATCE") (%)    21.28(2)            16.68       18.01           18.76       16.71              18.81       17.82     13.14        16.53       20.75        18.88     17.92     17.61     13.14     20.75
MRQ Net
Interest Margin
("NIM") (%)           3.22             3.16        3.37            2.63        3.30               2.66        3.22      2.49         3.35        3.31         3.45      3.26      3.09      2.49      3.45
MRQ Cost of
Deposits (%)          0.12             0.31        0.10            0.21        0.12               0.13        0.19      0.14         0.06        0.08         0.12      0.13      0.15      0.06      0.31
MRQ Efficiency
Ratio (%)             50.9             51.2        58.2            76.5        56.3               34.7        48.9      59.5         45.6        54.4         49.3      52.8      53.5      34.7      76.5


(1) NPAs / Assets = (Nonaccrual Loans + Troubled Debt Restructurings ("TDR") +

Other Real Estate Owned ("OREO")) / Total Assets

(2) Presented on a GAAP basis; adjusted profitability metrics for June 30, 2021

including adjusting the $20.7 million negative provision to $0 with an

assumed 21% tax rate are as follows: Adjusted profitability metrics for the


    quarter ended June 30, 2021: Adj. ROAA = 1.36%; Adj. ROATCE = 16.13%



                                       4

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6. The table entitled "First Interstate Comparable Company Analysis" on page 82


   of the Proxy Statement under the heading "The Merger-Opinion of Great
   Western's Financial Advisor-Comparable Company Analyses" is amended and
   restated as follows:



                                                                                                                                                                                                                                                                                                    First         First
                                                                                                                                                              Heartl        Columbia                                                                                   First          First       Interstate    Interstate
                                                  Associated                        Umpqua      Pacific                     Washington                     and Financial    Banking                                        First         CVB       International     Interstate     Interstate       Peer          Peer
                           First       PacWest      Banc-          Commerce        Holdings     Premier       Glacier        Federal       Independent          USA          System        Hilltop                       Financial    Financial     Bancshares          Peer           Peer         Group       

Group


Company                  Interstate    Bancorp       Corp       Bancshares Inc.     Corp.       Bancorp     Bancorp Inc.       Inc.       Bk Group Inc.        Inc.           Inc.      Holdings Inc.    Banner Corp.    Bancorp.       Corp.          Corp.        Group Median    Group Mean       Low           High

Market Cap. ($mm)             2,613      4,828         3,077              7,757       4,244        3,535           4,769         2,204            2,820            1,948       2,348            2,552           1,782        2,126        2,589            2,525           2,589         3,273         1,782         7,757
Price / TBV (%)                 205        188           118                232         155          193             266           139              192              136         154              117             139          168          190              126             155           168           117           266
Price / LTM EPS (x)            13.8        9.9          11.4               14.3         8.5         11.9            15.0          15.2             11.9              9.6        11.2              5.5            10.3         11.6         12.1             10.8            11.4          11.3           5.5          15.2
Price / 2021E EPS (x)          13.9        8.7          10.8               16.5        10.1         11.3            17.5          14.2             12.4              9.1        12.3              7.9            10.1         10.5         12.5                -            11.1          11.7           7.9          17.5
Price / 2022E EPS (x)          14.5        9.9          13.2               19.8        11.0         13.3            17.7          13.0             13.2              9.8        12.8             12.6            12.7         12.6         13.2                -            12.9          13.2           9.8          19.8
Current Dividend
Yield (%)                       3.9        2.4           3.9                1.6         4.4          3.5             2.6           2.8              2.1              2.2         3.4              1.5             3.2          4.1          3.8              3.0             3.0           3.0           1.5           4.4
Total Assets ($mm)           18,941     34,868        34,153             33,856      30,285       20,529          20,488        19,650           18,448           18,371      18,013           17,665          16,182       16,038       15,539           15,311          18,448        21,960        15,311        34,868
Loans / Deposits (%)           63.2       65.8          87.8               56.9        84.7         79.9            67.0          89.5             82.8             64.1        63.2             65.2            70.8         76.1         63.7             62.2            67.0          72.0          56.9          89.5
NPAs(1)/ Total Assets
(%)                            0.18       0.25          0.62               0.36        0.11         0.17            0.40          0.58             0.29             0.44        0.18             0.51            0.22         0.62         0.11             0.55            0.36          0.36          0.11          0.62
Loan Loss Reserves /
Loans (%)                      1.37       1.16          1.32               1.10        1.24         1.71            1.34          1.25             1.24             1.20        1.47             1.09            1.52         1.67         0.86             1.47            1.25          1.31          0.86          1.71
Net Charge-offs /
Average Loans (%)              0.04     (0.11)          0.08               0.02        0.24         0.03          (0.03)        (0.03)             0.13             0.12      (0.01)             0.02          (0.00)         0.23         0.02             0.07            0.02          0.05        (0.11)          0.24
TCE / TA (%)                   6.99       7.80          8.04               9.91        9.09         9.38            8.98          8.37             8.45             8.08        8.97            12.57            8.09         8.46         9.17            13.33            8.97          9.25          7.80         13.33
Total RBC Ratio (%)           13.89      14.99         14.02              15.07       15.41        15.61           14.45         14.09            14.23            15.04       14.47            23.48           14.62        15.31        15.94            21.75           15.04         15.90         14.02         23.48
MRQ ROAA (%)                   0.91       2.10          1.06               1.97        1.54         1.90            1.55          0.97             1.27             1.35        1.25             2.29            1.36         1.26         1.35             2.45            1.36          1.58          0.97          2.45
MRQ ROATCE (%)                14.26      28.58         13.32              19.77       17.44        22.31           17.85         10.53            16.68            18.01       14.82            18.76           17.90        16.71        15.54            18.81           17.85         17.80         10.53         28.58
MRQ NIM (%)                    2.81       3.39          2.37               2.59        3.20         3.43            3.43          2.82             3.16             3.37        3.15             2.63            3.51         3.30         3.03             2.66            3.16          3.07          2.37          3.51
MRQ Cost of Deposits
(%)                            0.06       0.10          0.07               0.04        0.11         0.08            0.07          0.24             0.31             0.10        0.04             0.21            0.09         0.12         0.05             0.13            0.10          0.12          0.04          0.31
MRQ Efficiency Ratio
(%)                            62.4       47.9          67.0               56.8        58.7         49.6            49.3          58.8             51.2             58.2        54.4             76.5            59.6         56.3         38.9             34.7            56.3          54.5          34.7          76.5


(1) NPAs / Assets = (Nonaccrual Loans + TDR + OREO) / Total Assets


                                       5

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7. The last table on page 83 of the Proxy Statement under the heading "The

Merger-Opinion of Great Western's Financial Advisor-Analysis of Precedent


   Transactions" is amended and restated as follows:



                                                                                                                                                                                          Nationwide Precedent Transactions
                                                                                                                                                              SVB
                                                                                                                                               WSFS        Financial
                                                   Old         New                                                                           Financial       Group
                                     Citizens    National     York                           Webster                           Eastern     Corporation /       /         Bridge
                       First         Financial   Bancorp    Community     Independent       Financial                        Bankshares,       Bryn         Boston      Bancorp
                    Interstate /      Group /    / First    Bancorp /         Bank         Corporation   BancorpSouth Bank     Inc. /          Mawr         Private      / Dime
                       Great         Investors   Midwest    Flagstar        Corp. /        / Sterling        / Cadence         Century         Bank        Financial   Community
                     Western(1)       Bancorp    Bancorp     Bancorp   

Meridian Bancorp Bancorp Bancorporation Bancorp Corporation Holdings Bancshares Median Mean Low


   High
Transaction Price
/ LTM Earn. (x)             12.0          14.4       18.5         4.0               15.1          16.8                 9.6          15.2            30.5        22.7         16.1        15.7        16.3         4.0        30.5
Transaction Price
/ NTM Earn. (x)            12.6  (2)      11.7       14.5         6.6               15.3          13.8                12.6             -            17.8        27.1         13.0        13.8        14.7         6.6        27.1
Transaction Price
/ TBV Per Share
(%)                          169           137        165         116                150           193                 158           175             234         121           97         154         155          97         234
TBV Premium Core
Deposits.  (%)(3)            7.2           5.0        5.9         1.8                7.5          10.5                 6.6           4.3            12.9         1.9        (0.6)         5.5         5.6       (0.6)        12.9
1-Day Market
Prem. (%)                   26.0          12.3        3.2         6.1               22.1          11.5                 5.1          20.8            14.2        29.5          7.8        11.9        13.3         3.2        29.5
Announce Date          9/16/2021     7/28/2021   6/1/2021   4/26/2021          4/22/2021     4/19/2021           4/12/2021      4/7/2021       3/10/2021    1/4/2021     7/1/2020           -           -           -      

-

. . .

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