Item 8.01. Other Events.




As previously announced, on September 15, 2021, First Interstate BancSystem,
Inc., a Montana corporation ("First Interstate") entered into an Agreement and
Plan of Merger (as amended from time to time, the "Merger Agreement") with Great
Western Bancorp, Inc., a Delaware corporation ("Great Western"). 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
First Interstate and Great Western.



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 First
Interstate and Great Western filed a definitive joint proxy statement/prospectus
with the SEC dated December 16, 2021 (the "Proxy Statement"), which First
Interstate and Great Western 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.



First Interstate and Great Western 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, First Interstate and Great Western have agreed to supplement the
Proxy Statement as described in this Current Report on Form 8-K. First
Interstate, Great Western and the other named defendants deny that they have
violated any laws or breached any duties to First Interstate's shareholders or
Great Western's stockholders, 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, First Interstate and Great Western 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. 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.








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
                                                                                                                                       Western  Western  Western  Western
                             Independent Heartland Hilltop    First  

International   First    First     First              Enterprise   Peer    

Peer Peer Peer


                              Bk Group   Financial Holdings Financial  Bancshares   Merchants  Busey   Financial  BancFirst Financial   Group    Group    Group    Group
Company        Great Western    Inc.     USA Inc.    Inc.   Bancorp.      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%









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:




                                                                                                                         Columbia                                                           First      First      First      First
                                         Associated  Commerce   Umpqua 

Pacific Glacier Washington Independent Heartland Banking Hilltop

First CVB International Interstate Interstate Interstate Interstate


                        First    PacWest   Banc-    Bancshares Holdings 

Premier Bancorp Federal Bk Group Financial System Holdings

Financial Financial Bancshares Peer Group Peer Group Peer Group Peer Group Company

               Interstate Bancorp    Corp       Inc.     Corp.   

Bancorp Inc. Inc. Inc. USA Inc. Inc. Inc. Banner Corp. Bancorp. Corp. Corp. Median 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

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
                                                  Old                                                                    WSFS     Financial
                                      Citizens  National New York                Webster                    Eastern    Financial   Group /    Bridge
                             First    Financial Bancorp  Community Independent  Financial                 Bankshares, Corporation  Boston   Bancorp /
                           Interstate  Group /  / First  Bancorp / Bank

Corp.  Corporation  BancorpSouth    Inc. /    / Bryn Mawr  Private     Dime

                            / Great   Investors Midwest  Flagstar  / Meridian  / Sterling  Bank / Cadence   Century      Bank     Financial Community
                           Western(1)  Bancorp  Bancorp   Bancorp    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           -       -         -       -




 (1) Transaction metrics based on closing prices as of September 14, 2021

(2) Based on mean Wall Street consensus analyst estimate for FY 2022 EPS of $2.80

(3) Core Deposits used in the Core Deposit Premium calculation defined as total


     deposits less time deposits with balances greater than $250,000

8. The first paragraph on page 84 of the Proxy Statement under the heading "The


    Merger-Opinion of Great Western's Financial Advisor-Net Present Value
    Analyses" is amended and restated as follows:




Piper Sandler performed an analysis that estimated the net present value of a
share of Great Western common stock assuming Great Western performed in
accordance with certain internal financial projections for Great Western for the
years ending September 30, 2021 through September 30, 2024, which assumed that a
special dividend is paid in the terminal period (i.e., the year ended September
30, 2024) in order to bring Great Western's terminal period TCE / TA ratio in
line with the Great Western Peer Group median. The projected dividends used in
the analyses for the years ending September 30, 2021 through September 30, 2024
were: $0.12; $0.50; $0.84 and $7.87 per share annually, respectively. To
approximate the terminal value of a share of Great Western common stock at
September 30, 2024, Piper Sandler applied price to year ended September 30, 2024
earnings multiples ranging from 10.0x to 14.0x and multiples of year ended
September 30, 2024 tangible book value ranging from 130% to 170%. Piper Sandler
selected these price to earnings and tangible book value multiples based on
Piper Sandler's review of, among other matters, the trading multiples of
selected companies that Piper Sandler deemed to be comparable to Great Western.
The terminal values were then discounted to present values using different
discount rates ranging from 9.5% to 13.5%, which were chosen to reflect
different assumptions regarding required rates of return of holders or
prospective buyers of Great Western common stock. As illustrated in the
following tables, the analysis indicated an imputed range of values per share of
Great Western common stock of $23.50 to $34.07 when applying multiples of
earnings and $24.74 to $34.11 when applying multiples of tangible book value.



9. The sentence immediately above the third table on page 84 of the Proxy

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

Advisor-Net Present Value Analyses" is deleted and replaced in its entirety


    with the following:




Piper Sandler also considered and discussed with the Great Western board of
directors how this analysis would be affected by changes in the underlying
assumptions, including variations with respect to earnings. To illustrate this
impact, Piper Sandler performed a similar analysis, assuming Great Western's
earnings varied from 20% above projections to 20% below projections. This
analysis resulted in the following range of per share values for Great Western
common stock, applying the price to fiscal year 2024 earnings multiples range of
10.0x to 14.0x referred to above and a discount rate of 11.71%.



                          Earnings Per Share Multiples



Annual Estimate
Variance         10.0x  11.0x  12.0x  13.0x  14.0x
(20.0%)         $21.09 $22.54 $23.99 $25.44 $26.89
(10.0%)         $22.90 $24.53 $26.16 $27.79 $29.42
0.0%            $24.71 $26.52 $28.34 $30.15 $31.96
10.0%           $26.52 $28.52 $30.51 $32.50 $34.49
20.0%           $28.34 $30.51 $32.68 $34.86 $37.03




Piper Sandler also performed an analysis that estimated the net present value
per share of First Interstate common stock, assuming First Interstate performed
in accordance with publicly available mean analyst earnings per share and
. . .

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