Item 8.01 Other Events



On June 25, 2021, Bank of Marin Bancorp, a California corporation (the "Company"
or "BMRC") filed with the Securities and Exchange Commission ("SEC") a final
prospectus pursuant to Rule 424(b)(3) that contained a joint proxy
statement/prospectus (the "Joint Proxy Statement/Prospectus"), with respect to
the special meetings of shareholders of the Company and American River
Bankshares ("American River" or "AMRB") to be held on July 28, 2021 in
connection with the Company's proposed merger (the "Merger") with American
River, upon the terms and subject to the conditions set forth in the Agreement
to Merge and Plan of Reorganization, dated April 16, 2021, by and between the
Company and American River.

Important information concerning the special meeting and the proposed Merger is
set forth in the Joint Proxy Statement/Prospectus. The Joint Proxy
Statement/Prospectus is amended and supplemented by, and should be read as part
of, and in conjunction with, the information set forth in this Current Report on
Form 8-K. Nothing in this Current Report on Form 8-K shall be deemed an
admission of the legal necessity or materiality under applicable laws of the
disclosures set forth herein.

1. The disclosure under the heading "Joint Proposal 1 - The Merger - Opinion of
AMRB's Financial Advisor - Comparable Company Analyses" is hereby amended by
deleting the table of company names in the middle of page 54 (the AMRB Peer
Group) of the joint proxy statement/prospectus and replacing it with the
following:

Financials as of December                                                                    Market Data (as of 04/15/2021)                               LTM Profitability                                Balance Sheet Ratios
31, 2020
                                                                                                   Price /
                                                                                              Tang.                       1 Yr
                                                                            Total    Mkt      Book     LTM      Div.      Price                  Eff.                                             TCE/     Loan/             NPAs/
                                                                            Assets   Cap      Value    EPS      Yield     ?                      Ratio    NIM      ROAA       ROAE                TA       Dpts              Assets
Company Name                 City, St               Ticker                  ($M)     ($M)     (%)      (x)      (%)       (%)                    (%)      (%)      (%)        (%)                 (%)      (%)               (%)

Publicly-Traded California Banks with Total Assets $0.60 to $1.25 Billion Suncrest Bank

Visalia, CA            SBKK                    1,246    155      122      12.0     0.0       61.4                   50       3.69     1.10       8.2                 10.6     79                0.33
Valley Republic Bancorp      Bakersfield, CA        VLLX                    1,236    130      136      9.3      0.0       87.5                   48       3.13     1.12       14.5                7.7      78                0.35
Plumas Bancorp               Reno, NV               PLBC                    1,112    148      149      10.3     2.0       68.0                   50       4.02     1.43       15.5                9.0      73                0.35
United Security Bancshares   Fresno, CA             UBFO                    1,093    133      118      14.8     5.6       29.4                   58       3.39     0.86       7.5                 10.4     69                1.56
Community West Bancshares    Goleta, CA             CWBC                    975      110      125      13.4     1.9       117.6                  68       3.89     0.85       9.7                 9.0      112               0.76
American Riviera Bank        Santa Barbara, CA      ARBV                    972      94       121      13.0     0.0       56.2                   65       3.97     0.86       9.2                 8.2      83                0.35
Communities First Financial  Fresno, CA             CFST                    871      127      181      10.9     0.0       99.8                   45       3.92     1.60       19.3                7.9      85                0.24

Corporation


Summit State Bank            Santa Rosa, CA         SSBI                    866      99       142      9.4      2.9       112.5                  52       3.91     1.33       14.7                8.1      104               0.28
1st Capital Bancorp          Salinas, CA            FISB                    833      75       101      16.7     0.0       37.9                   68       3.62     0.63       6.3                 8.9      81                0.15
US Metro Bank¹               Garden Grove, CA       USMT                    767      53       88       12.0     0.0       32.7                   56       3.32     0.81       7.6                 11.4     89                0.25
Bank of San Francisco        San Francisco, CA      BSFO                    674      51       113      10.9     0.0       21.8                   51       3.42     0.85       10.8                6.8      102               0.33
Bay Community Bancorp        Oakland, CA            CBOB.A                  634      61       100      12.7     0.0       43.1                   59       3.65     0.84       8.3                 7.6      92                0.04
Pinnacle Bank                Gilroy, CA             PBNK                    618      68       115      17.5     0.0       59.4                   67       3.84     0.71       7.1                 9.4      88                0.01
Pacific Enterprise Bancorp   Irvine, CA             PEBN                    604      58       103      18.9     0.0       50.0                   73       4.10     0.51       5.2                 9.4      118               0.00
1) US Metro Bank financial data shown bank-level
Note: Institutions are not pro forma for pending / recently completed M&A and / or capital raises that occurred after period end; Excludes merger targets
Source: S&P Global Market Intelligence



2. The disclosure under the heading "Joint Proposal 1 - The Merger - Opinion of
AMRB's Financial Advisor - Comparable Company Analyses" is hereby amended by
deleting the table of company names at the middle of page 55 (BMRC Peer Group)
of the joint proxy statement/prospectus and replacing it with the following:


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Financials as of December 31, 2020                                                                       Market Data (as of 04/15/2021)                                      LTM Profitability                                           Balance Sheet Ratios
                                                                                                                Price /
                                                                                                      Tang.              Est.               1 Yr
                                                                                 Total     Mkt        Book      LTM      2021     Div.      Price                 Eff.                                                TCE/      Loan/     Cost of      NIBD/           NPAs/
                                                                                 Assets    Cap        Value     EPS      EPS      Yield     ?          

          Ratio     NIM      ROAA        ROAE                 TA        Dpts      Funds        Deposits        Assets
Company Name                       City, St             Ticker                   ($M)      ($M)       (%)       (x)      (x)      (%)       (%)                   (%)       (%)      (%)         (%)                  (%)       (%)       (%)          (%)             (%)

Western Region Exchange-Traded Banks with Total Assets $2.0 - $8.0 Billion, Cost of Funds Less than 0.25%, and NIBD / Total Deposits Greater than 30% TriCo Bancshares

Chico, CA            TCBK                     7,640     1,394      203       21.7     15.6     2.1       60.0                  56        3.96     0.91        7.2                  9.3       73        0.10         40              0.44
Westamerica Bancorporation         San Rafael, CA       WABC                     6,748     1,715      238       20.6     21.9     2.6       8.6                   47        2.91     1.30        11.3                 10.9      22        0.03         48              0.11
Heritage Financial Corporation     Olympia, WA          HFWA                     6,615     1,014      179       21.9     17.3     2.8       52.4                  62        3.60     0.74        5.8                  8.9       80        0.16         35              1.46
Central Pacific Financial Corp.    Honolulu, HI         CPF                      6,595     771        141       20.7     15.8     3.4       88.9                  61        3.30     0.58        6.9                  8.3       86        0.16         31              0.21
Heritage Commerce Corp             San Jose, CA         HTBK                     4,634     721        183       20.4     18.7     4.3       68.5                  55        3.50     0.80        6.1                  8.8       67        0.19         42              0.17
Sierra Bancorp                     Porterville, CA      BSRR                     3,221     414        132       11.6     10.5     3.1       64.6                  57        3.95     1.22        10.8                 9.8       94        0.13         36              0.62
Central Valley Community Bancorp   Fresno, CA           CVCY                     2,004     244        128       12.0     11.8     2.3       60.3                  64        3.87     1.11        8.9                  9.8       64        0.07         48              0.56

Note: Institutions are not pro forma for pending / recently completed M&A and / or capital raises that occurred after period end; Excludes merger targets Source: S&P Global Market Intelligence





3. The disclosure under the heading "Joint Proposal 1 - The Merger - Opinion of
AMRB's Financial Advisor - Analysis of Precedent Transactions" is hereby amended
by deleting the table of Acquiror and Target names at the bottom of page 56 (the
Precedent Transactions group) of the joint proxy statement/prospectus and
replacing it with the following:

                                                                                                  Transaction Information                                                      Seller Financial Information
                                                                             Consideration                         Price/        Core        1-Day
                                                                      Deal         Cash/                    LTM        Tang.     Deposit     Market          Total      Total      TCE/      LTM          LTM       NPAs/
                                                         Annc.        Value        Stock Mix                EPS        Book      Prem.       Prem.           Assets     Equity     TA        ROAA         ROAE      Assets
Acquiror                    Target                       Date         ($M)         (%)                      (x)        (%)       (%)         (%)             ($M)       ($M)       (%)       (%)          (%)       (%)
Nationwide Bank Transactions Since March 1, 2020 with Target Assets $0.60B - $1.25B
Stock Yards Bancorp, Inc.   Kentucky Bancshares, Inc.    01/27/21     191.3        15% / 85%                16.3       171       9.5         68.8            1,201      125        9.4       1.00         9.7       0.51
(KY)                        (KY)
BancorpSouth Bank (MS)      FNS Bancshares, Inc. (AL)    01/13/21     108.4        17% / 83%                19.4       154       6.5         35.1            786        81         9.1       0.78         7.0       0.80
BancorpSouth Bank (MS)      National United Bancshares,  12/02/20     114.7        29% / 71%                15.8       156       6.8         -               749        75         10.0      1.10         10.5      1.17
                            Inc. (TX)
Virginia National           Fauquier Bankshares, Inc.    10/01/20     62.2         0% / 100%                10.1       85        (1.4)       8.1       

840 72 8.6 0.79 8.8 1.31 Bankshares Corporation (VA) (VA) First Mid Bancshares, Inc. LINCO Bancshares, Inc. (MO) 09/28/20 144.9

        80% / 20%                21.0       107       1.4         -          

1,184 169 12.8 0.89 5.9 1.17 (IL) Blue Ridge Bankshares, Inc. Bay Banks of Virginia, Inc. 08/13/20 97.3

         0% / 100%                17.9       81        (2.8)       21.4       

1,238 120 9.6 (0.37) (3.4) 1.38 (VA)

                        (VA)

Source: S&P Global Market Intelligence; as of April 15, 2021





4. The disclosure under the heading "Joint Proposal 1 - The Merger - Opinion of
AMRB's Financial Advisor - Net Present Value Analyses" is hereby supplemented by
adding the following to the first paragraph thereunder as a new third sentence
following the number 150% in the middle of page 57 of the joint proxy
statement/prospectus:

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 AMRB.

5. The disclosure under the heading "Joint Proposal 1 - The Merger - Opinion of
AMRB's Financial Advisor - Net Present Value Analyses" is hereby supplemented by
adding the following table after the Earnings Per Share Multiples chart (Annual
Estimate Variance) at the top of page 58 of the joint proxy
statement/prospectus:

The following table describes the discount rate calculation for AMRB common
stock prepared by Piper Sandler. In its normal course of business, Piper Sandler
employs the Duff & Phelps Cost of Capital Navigator in determining an
appropriate discount rate in which the discount rate equals the sum of the risk
free rate, the equity risk premium, the size premium and the industry premium.


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Risk Free Rate        1.56%       Per Duff & Phelps Normalized Rate
Equity Risk Premium   7.15%       Per Duff & Phelps Cost of Capital Navigator
Size Premium          3.16%       Per Duff & Phelps Cost of Capital Navigator
Industry Premium      1.29%       Per Duff & Phelps Cost of Capital Navigator
Discount Rate         13.16%



6. The disclosure under the heading "Joint Proposal 1 - The Merger - Opinion of
AMRB's Financial Advisor - Net Present Value Analyses" is hereby supplemented by
adding the following to the last full paragraph in the middle of page 58 of the
joint proxy statement/prospectus as a new third sentence following the number
225%:

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 BMRC.

7. The disclosure under the heading "Joint Proposal 1 - The Merger - Opinion of
AMRB's Financial Advisor - Net Present Value Analyses" is hereby supplemented by
adding the following table after the Earnings Per Share Multiples chart (Annual
Estimate Variance) in the middle of page 59 of the joint proxy
statement/prospectus:

The following table describes the discount rate calculation for BMRC common
stock prepared by Piper Sandler. In its normal course of business, Piper Sandler
employs the Duff & Phelps Cost of Capital Navigator and Bloomberg in determining
an appropriate discount rate in which the discount rate equals the risk free
rate plus the product of the 2-year beta for BMRC common stock and the equity
risk premium, plus the size premium.

Risk Free Rate          1.56%       Per Duff & Phelps Normalized Rate
2 Year Beta of Stock    114.2%      Bloomberg
Equity Risk Premium     7.15%       Per Duff & Phelps Cost of Capital Navigator
Size Premium            1.42%       Per Duff & Phelps Cost of Capital Navigator
Discount Rate           11.14%



8. The disclosure under the heading "Joint Proposal 1 - The Merger - Opinion of
AMRB's Financial Advisor - Pro Forma Transaction Analysis" is hereby amended by
deleting the last sentence of the first paragraph of the section at the bottom
of page 59 of the joint proxy statement/prospectus and replacing it with the
following:

The analysis indicated the merger could be accretive to BMRC's estimated
earnings per share (excluding one-time transaction costs and expenses) in the
years ending December 31, 2022, December 31, 2023 by approximately 13.5% and
13.2%, respectively, and could be dilutive to BMRC's estimated tangible book
value per share at closing as of September 30, 2021 by approximately 3.9%,
approximately neutral to BMRC's estimated tangible book value per share at
December 31, 2024 and approximately 0.9% accretive BMRC's estimated tangible
book value per share at December 31, 2025.

9. The disclosure under the heading "Joint Proposal 1 - The Merger - Interests
of Directors and Executive Officers - Continued Employment" is hereby amended on
Page 80 of the joint proxy statement/prospectus by deleting the two paragraphs
under such heading and replacing it with the following:

It is currently contemplated that certain of the senior executive officers of
AMRB may continue their employment for some period of time with BMRC and/or Bank
of Marin to assist with post-merger integration, not to extend past October 15,
2021 in the case of Messrs. Bender and Derenzo or past December 31, 2021 in the
case of Mr. Ritchie. Mr. Colombo and Mr. Ritchie communicated with each

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other periodically both before and after the signing of the merger agreement regarding post-transaction employment and directorships and successful integration of AMRB and Bank of Marin.



Other than as set forth above, no director or officer of AMRB has any direct or
indirect material interest in the merger, except insofar as ownership of AMRB
common stock might be deemed such an interest.

10. The following disclosure amends and supplements the discussions in the section of the joint proxy statement/prospectus entitled "Joint Proposal 1--The Merger" on page 84 by adding in the following section entitled "Litigation Relating to the Merger".



On June 21, 2021, Shiva Stein, a purported shareholder of American River at the
time which American River and Company entered into the merger agreement (the
"Merger Agreement"), filed a lawsuit against American River and the members of
its board of directors in the United States District Court for the Eastern
District of California, captioned Stein v. American River Bankshares, et al.,
Case No. 2:21-at-00566 (the "Stein Complaint"). On June 25, 2021, Pinchas Raul,
a purported shareholder of American River at the time of the Merger Agreement,
filed a lawsuit against American River and the current members of American
River's board of directors in the United States District Court for the Southern
District of New York, captioned Raul v. American River Bankshares, et al., Case
No. 1:21-cv-00565 (the "Raul Complaint"). On June 28, 2021, Matthew Whitfield, a
purported shareholder of American River at the time of the Merger Agreement,
filed a lawsuit against American River, the current members of American River's
board of directors, and Company in the United States District Court for the
Southern District of New York, captioned Whitfield v. American River Bankshares,
et al., Case No. 1:21-cv-05607 (the "Whitfield Complaint"). On July 8, 2021,
Paul Parshall, a purported shareholder of American River at the time of the
Merger Agreement, filed a lawsuit against American River and the current members
of American River's Board of Directors in the United States District Court for
the Eastern District of California, captioned Parshall v. American River
Bankshares, et al., Case No. 2:21-at-00617 (the "Parshall Complaint"). On July
14, 2021, Jeffrey D. Justice, II, a purported shareholder of the American River,
filed a lawsuit against American River and the current members of American
River's Board of Directors in the United States District Court for the Eastern
District of Pennsylvania, captioned Justice v. American River Bankshares, et
al., Case No. 2:21-cv-03125 (the "Justice Complaint", together with the Parshall
Complaint, the Raul Complaint, the Stein Complaint and the Whitfield Complaint,
are hereinafter collectively referred to as the "Complaints").

The Stein, Raul, Whitfield, Justice and Parshall Complaints allege that the
American River and its directors violated Section 14(a) of the Exchange Act,
along with Rule 14a-9 promulgated thereunder, by filing the registration
statement of which this document is a part, which allegedly contains false
statements and omits material information intended to solicit shareholders to
vote in favor of the merger. The Whitfield Complaint is the only action that
lists Company as a defendant. All five Complaints also allege that the directors
of American River (and, in the case of the Whitfield Complaint, Company)
violated Section 20(a) of the Exchange Act due to their positions as controlling
persons over parties that allegedly knowingly violated Section 14(a), and are
thus liable under Section 20(a). The Complaints seek (1) injunctive relief
preliminarily and permanently enjoining consummation of the Merger, (2)
rescission of the Merger and an award of rescissory damages in the event the
Merger is consummated, (3) injunctive relief directing dissemination of a
registration statement that does not contain any untrue statements of material
fact and that states all material facts in it or necessary to make the
statements contained therein not misleading, (4) a declaration that defendants
violated Sections 14(a) and/or 20(a) of the Exchange Act, and (5) an award of
costs incurred by plaintiff in bringing the lawsuit, including attorneys' and
experts' fees. The Company and American River believe the Complaints are without
merit. At this stage, it is not possible to predict the outcome of the
proceedings in the merger-related litigation or their impact on the Company,
American River or the Merger.

Forward-Looking Statements

This communication includes forward-looking statements within the meaning of the "Safe-Harbor" provisions of the Private Securities Litigation Reform Act of 1995. These statements are necessarily subject to risk and uncertainty and actual results could differ materially from those anticipated due to

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various factors, including those set forth from time to time in the documents
filed or furnished by the Company and American River with the Securities and
Exchange Commission (the "SEC"). The following factors, among others, could
cause actual results to differ from those set forth in the forward-looking
statements: (i) the possibility that the Merger does not close when expected or
at all because required regulatory, shareholder or other approvals, financial
tests or other conditions to closing are not received or satisfied on a timely
basis or at all; (ii) the businesses of the Company and American River may not
be integrated successfully or such integration may be more difficult,
time-consuming or costly than expected; (iii) changes in the Company's or
American River's stock price before closing, including as a result of its
financial performance prior to closing, or more generally due to broader stock
market movements, and the performance of financial companies and peer group
companies; (iv) the risk that the benefits from the transaction may not be fully
realized or may take longer to realize than expected, or that expected revenue
synergies and cost savings from the Merger may not be fully realized or realized
within the expected time frame, including as a result of changes in general
economic and market conditions, interest and exchange rates, monetary policy,
laws and regulations and their enforcement, the effect of pandemic disease
(including Covid-19) and the degree of competition in the geographic and
business areas in which the Company and American River operate; (v) the ability
to promptly and effectively integrate the businesses of the Company and American
River; (vi) the reaction to the transaction of the companies' clients, employees
and counterparties; (vii) diversion of time of directors, management and other
employees on merger-related issues; (viii) changes in interest rates, general
economic conditions, legislative/regulatory changes, monetary and fiscal
policies of the U.S. government, including policies of the U.S. Treasury and the
Board of Governors of the Federal Reserve; the quality and composition of the
loan and securities portfolios; demand for loan products; deposit flows;
competition; demand for financial services in the companies' respective market
areas; their implementation of new technologies; their ability to develop and
maintain secure and reliable electronic systems; and accounting principles,
policies, and guidelines, (ix) lower than expected revenues, credit quality
deterioration or a reduction in real estate values or a reduction in net
earnings; and (x) other risks that are described in the Company's and American
River's public filings with the SEC. You should not place undue reliance on
forward-looking statements and the Company and American River undertake no
obligation to update any such statements to reflect circumstances or events that
occur after the date on which the forward-looking statement is made except as
required by law.

Additional Information About the Merger and Where to Find It



Investors and security holders are urged to carefully review and consider each
of the Company's and American River's public filings with the SEC, including but
not limited to their Annual Reports on Form 10-K, their proxy statements, their
Current Reports on Form 8-K and their Quarterly Reports on Form 10-Q. The
documents filed by the Company with the SEC may be obtained free of charge at
the Company's website at www.bankofmarin.com or at the SEC's website at
www.sec.gov. These documents may also be obtained free of charge from the
Company by making a request in writing to Bank of Marin Bancorp, 504 Redwood
Boulevard, Suite 100, Novato, California 94947; Attention: Corporate Secretary,
or by telephone at (415) 763-4520. The documents filed by American River with
the SEC may be obtained free of charge at American River's website at
www.americanriverbank.com or at the SEC's website at www.sec.gov. These
documents may also be obtained free of charge from American River by making a
request in writing to American River Bankshares, 3100 Zinfandel Drive, Rancho
Cordova, California 95670; Attention: Corporate Secretary, or by telephone at
916-851-0123.

Company has filed a registration statement with the SEC (333-257025) which
includes a joint proxy statement of the Company and American River and a
prospectus of Company, and each party will file other documents regarding the
proposed transaction with the SEC. Before making any voting or investment
decision, investors and security holders of the Company and American River are
urged to carefully read the entire registration statement and joint proxy
statement/prospectus as well as any amendments or supplements to these
documents, because they will contain important information about the proposed
transaction. A definitive joint proxy statement/prospectus has been sent to the
shareholders of the Company and American River seeking required shareholder
approvals. Investors and security holders are able to obtain the registration
statement and the joint proxy statement/prospectus free of charge from the SEC's
website or from the Company or America River by writing to the addresses
provided for each company set forth in the paragraphs above.

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The Company, American River, their respective directors, executive officers and
certain other persons may be deemed to be participants in the solicitation of
proxies from the Company and American River shareholders in favor of the
approval of the transaction. Information about the directors and executive
officers of the Company and their ownership of Company common stock is set forth
in the proxy statement for the Company's 2021 annual meeting of shareholders, as
previously filed with the SEC. Information about the directors and executive
officers of American River and their ownership of American River common stock is
set forth in the proxy statement for American River's 2021 annual meeting of
shareholders, as previously filed with the SEC. Shareholders may obtain
additional information regarding the interests of such participants by reading
the registration statement and the joint proxy statement/prospectus when they
become available.


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