PROXY                              BSM BANCORP                             PROXY
                         ANNUAL MEETING OF SHAREHOLDERS
                                 JUNE 18, 1998
          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
 
    The undersigned shareholder acknowledges receipt of the Notice of Annual
Meeting of Shareholders of BSM Bancorp (the "Bancorp") and the accompanying
Joint Proxy Statement/Prospectus dated             , 1998, and revoking any
proxy heretofore given, hereby appoints Joseph Sesto, Jr., Mitsuo Taniguchi, and
Joseph F. Ziemba, or any one of them, with full power to act alone, my true and
lawful attorney(s), agent(s) and proxy, with full power of substitution, for me
and in my name, place and stead to vote and act with respect to all shares of
common stock of the Bancorp which the undersigned would be entitled to vote at
the Annual Meeting of Shareholders to be held on June 18, 1998, at 7:00 p.m.,
2739 Santa Maria Way, Santa Maria, California, and at any and all adjournment or
adjournments thereof, with all the powers that the undersigned would possess if
personally present, as follows:
 
1.   APPROVAL OF MERGER AGREEMENT. To approve the principal terms of
     the Agreement to Merge a Plan of Reorganization dated January 29,
     1998 (the "Agreement"), as amended, by and among the Bancorp, the
     Bank and Mid-State Bank ("Mid-State") and the transactions
     contemplated thereby pursuant to which (i) the Bank will merge
     with and into Mid-State and Mid-State will continue as the
     surviving bank, (ii) the Bancorp will become the bank holding
     company for Mid-State and change its name to "Mid-State
     Bancshares" and (iii) the shareholders of Mid-State will become
     shareholders of the Bancorp in accordance with the exchange ratio
     set forth in the Agreement (the "Merger"). The terms and
     conditions of the Agreement and the formulas for calculating the
     number of shares of Bancorp Common Stock to be issued for each
     share of Mid-State Common Stock are set forth in the accompanying
     Joint Proxy Statement/Prospectus dated             , 1998.
     Approval of the principal terms of the Agreement requires the
     affirmative vote of a majority of the outstanding shares of
     Bancorp Common Stock.
 
            / /  FOR            / /  AGAINST            / /  ABSTAIN
 
2.   ELECTION OF DIRECTORS.  FOR all nominees listed below   WITHHOLD AUTHORITY
     To elect as directors   (EXCEPT AS INDICATED TO THE     TO VOTE FOR ALL
     the nominees set forth  CONTRARY BELOW). / /            NOMINEES LISTED
     below:                                                  BELOW. / /
 
Armand R. Acosta
Richard E. Adam
Fred L. Crandall, Jr.
A.J. Diani
William A. Hares
Roger A. Ikola
Toshiharu Nishino
Joseph Sesto, Jr.
William L. Snelling
Mitsuo Taniguchi
Joseph F. Ziemba
 
- --------------------------------------------------------------------------------
 
(INSTRUCTION: TO WITHHOLD AUTHORITY TO VOTE FOR ANY INDIVIDUAL NOMINEE(S), WRITE
                    THAT NOMINEE(S) NAME IN THE SPACE ABOVE)

 
3.   APPROVAL OF PROPOSED AMENDMENTS TO 1996 STOCK OPTION PLAN. As
     required by the Agreement, to approve proposed amendments to the
     Bancorp's 1996 Stock Option Plan that would allow for the
     granting of substitute stock options to officers and employees of
     the Bancorp and the Bank, and certain directors of the Bancorp
     and the Bank that will continue as directors of the Bancorp and
     Mid-State, and such substitute options would have the same terms
     and conditions as existing Bancorp options, except that such
     substitute options would be completely vested, and such stock
     options would not terminate as a result of the Merger, subject to
     all necessary approvals of the California Department of
     Corporations and any other necessary regulatory agency, as
     described in the Joint Proxy Statement/Prospectus.
 
            / /  FOR            / /  AGAINST            / /  ABSTAIN
 
4.   OTHER BUSINESS
     To transact such other business as may properly come before the
     meeting.
 
    Execution of this proxy confers authority to vote "FOR" each proposal listed
    above unless the shareholder directs otherwise. If any other business is
    presented at said meeting, this proxy shall be voted in accordance with the
    recommendations of the Board of Directors. When signing as attorney,
    executor, administrator, trustee or guardian, please give full title. If
    more than one trustee, all should sign. All joint owners SHOULD sign.
 
    THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR" EACH OF THE LISTED PROPOSALS.
    THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS AND MAY BE
    REVOKED PRIOR TO ITS EXERCISE.
 
    I/WE DO / / or I/WE DO NOT / / expect to attend the meeting.
                                           Dated _________________________, 1998
                                           _____________________________________
                                                    (Number of Shares)
                                           _____________________________________
                                                Signature of Shareholder(s)
                                           _____________________________________
                                                Signature of Shareholder(s)