PROFESSIONAL BANCORP INC
SC 13D/A, 1998-11-05
STATE COMMERCIAL BANKS
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           UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                       Washington, D.C.  20549


                            SCHEDULE 13D

              Under the Securities Exchange Act of 1934
                          (Amendment No. 1)




                         Professional Bancorp, Inc.
                          (Name of Issuer)

                    Common Stock, $0.01 par value
                    (Title of Class of Securities)

                              743112-10-4
                           (CUSIP Number)

                          Charles J. Moore
                           The Banc Funds
                      208 South LaSalle Street
                      Chicago, Illinois  60604
                            (312) 855-6202
             (Name, Address and Telephone Number of Person
            Authorized to Receive Notices and Communications)

                          October 27, 1998
        (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
this  acquisition  which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b) (3) or (4), check the following box [ ].

Check the following box if a fee is being paid with the statement [ ].


                                                        1

<PAGE>



CUSIP No.  743112-10-4


1  Name of Reporting Person
   S.S. or I.R.S. Identification No. of Above Person (optional)
                      Banc Fund III L.P.


2                                                     Check the  Appropriate Box
                                                      If A  Member  of a  Group*
                                                      (A) [ ]` (B) [X]

3  SEC Use Only

4  Source of Funds:   WC

5  Check Box If Disclosure Of Legal Proceedings Is Required
   Pursuant To Items 2(d) or 2(e)                        [ ]

6  Citizenship or Place of Organization
   Illinois

                            7  Sole Voting Power
Number of                      12,084 shares
 Shares
Beneficially                8  Shared Voting Power
Owned By                       0
  Each
Reporting                   9  Sole Dispositive Power
Person                         12,084 shares
  With
                           10 Shared Dispositive Power
                                        0

11  Aggregate Amount of Beneficially Owned by Each Reporting Person
    12,084 shares

12  Check Box If The Aggregate Amount In Row (11) Excludes
    Certain Shares*                                    [ ]

13  Percent of Class Represented By Amount In Row (11)
    0.61%

14  Type of Reporting Person*
    PN



                                                        2

<PAGE>



CUSIP No.  743112-10-4


1  Name of Reporting Person
   S.S. or I.R.S. Identification No. of Above Person (optional)
                      Bank Fund III Trust


2                                                     Check the  Appropriate Box
                                                      If A  Member  of a  Group*
                                                      (A) [ ] (B) [X]

3  SEC Use Only

4  Source of Funds:   WC

5  Check Box If Disclosure Of Legal Proceedings Is Required
   Pursuant To Items 2(d) or 2(e)                        [ ]

6  Citizenship or Place of Organization
   Illinois

                            7  Sole Voting Power
Number of                      37,041 shares

Beneficially                8  Shared Voting Power
Owned By                       0
  Each
Reporting                   9  Sole Dispositive Power
Person                         37,041 shares
  With
                           10 Shared Dispositive Power
                                        0

11  Aggregate Amount of Beneficially Owned by Each Reporting Person
    37,041 shares

12  Check Box If The Aggregate Amount In Row (11) Excludes
    Certain Shares*                                    [ ]

13  Percent of Class Represented By Amount In Row (11)
    1.86%

14  Type of Reporting Person*
    PN



                                                        3

<PAGE>



CUSIP No.  743112-10-4


1  Name of Reporting Person
   S.S. or I.R.S. Identification No. of Above Person (optional)
                      Banc Fund IV L.P.


2                                                     Check the  Appropriate Box
                                                      If A  Member  of a  Group*
                                                      (A) [ ] (B) [X]

3  SEC Use Only

4  Source of Funds:   WC

5  Check Box If Disclosure Of Legal Proceedings Is Required
   Pursuant To Items 2(d) or 2(e)                        [ ]

6  Citizenship or Place of Organization
   Illinois

                            7  Sole Voting Power
Number of                       14,744 shares
 Shares
Beneficially                8  Shared Voting Power
Owned By                       0
  Each
Reporting                   9  Sole Dispositive Power
Person                         14,744 shares
  With
                           10 Shared Dispositive Power
                                        0

11  Aggregate Amount of Beneficially Owned by Each Reporting Person
    14,744 shares

12  Check Box If The Aggregate Amount In Row (11) Excludes
    Certain Shares*                                    [ ]

13  Percent of Class Represented By Amount In Row (11)
    0.74%

14  Type of Reporting Person*
    PN



                                                        4

<PAGE>



CUSIP No.  743112-10-4


1  Name of Reporting Person
   S.S. or I.R.S. Identification No. of Above Person (optional)
                      Banc Fund IV Trust


2                                                     Check the  Appropriate Box
                                                      If A  Member  of a  Group*
                                                      (A) [ ] (B) [X]

3  SEC Use Only

4  Source of Funds:   WC

5  Check Box If Disclosure Of Legal Proceedings Is Required
   Pursuant To Items 2(d) or 2(e)                        [ ]

6  Citizenship or Place of Organization
   Illinois

                            7  Sole Voting Power
Number of                      48,581 shares
 Shares
Beneficially                8  Shared Voting Power
Owned By                       0
  Each
Reporting                   9  Sole Dispositive Power
Person                         48,581 shares
  With
                           10 Shared Dispositive Power
                                        0

11  Aggregate Amount of Beneficially Owned by Each Reporting Person
    48,581 shares

12  Check Box If The Aggregate Amount In Row (11) Excludes
    Certain Shares*                                    [ ]

13  Percent of Class Represented By Amount In Row (11)
    2.44%

14  Type of Reporting Person*
    PN


                                                        5

<PAGE>



CUSIP No.  743112-10-4


1  Name of Reporting Person
   S.S. or I.R.S. Identification No. of Above Person (optional)
                      Banc Fund V L.P.


2                                                     Check the  Appropriate Box
                                                      If A  Member  of a  Group*
                                                      (A) [ ] (B) [X]

3  SEC Use Only

4  Source of Funds:   WC

5  Check Box If Disclosure Of Legal Proceedings Is Required
   Pursuant To Items 2(d) or 2(e)                        [ ]

6  Citizenship or Place of Organization
   Illinois

                            7  Sole Voting Power
Number of                      25,200 shares
 Shares
Beneficially                8  Shared Voting Power
Owned By                       0
  Each
Reporting                   9  Sole Dispositive Power
Person                         25,200 shares
  With
                           10 Shared Dispositive Power
                                        0

11  Aggregate Amount of Beneficially Owned by Each Reporting Person
    25,200 shares

12  Check Box If The Aggregate Amount In Row (11) Excludes
    Certain Shares*                                    [ ]

13  Percent of Class Represented By Amount In Row (11)
    1.26%

14  Type of Reporting Person*
    PN


                                                        6

<PAGE>



This Amendment No. 1 amends and supplements Schedule 13D filed on April 23, 1998
(collectively  the "Schedule  13D") by the entities  included in Item 2(a), with
respect to the Common Stock,  $0.01 par value ("Common Stock"),  of Professional
Bancorp,  Inc. ("MDB"). The address of the principal executive offices of MDB is
606 Broadway, Santa Monica, CA 90401. The purpose of this Amendment is to report
an increase in ownership of more than 1% in the  percentage  of the  outstanding
Common Stock of MDB.

Item 2.   Identity and Background

  (a) This  statement  is filed by Banc Fund III L.P.  ("BF  III"),  an Illinois
Limited Partnership, Bank Fund III Trust ("T III"), Banc Fund IV L.P. ("BF IV"),
an Illinois  Limited  Partnership,  Banc Fund IV Trust ("T IV"), and Banc Fund V
L.P. ("BF V") an Illinois Limited  Partnership.  The business of the Funds is to
provide  financing  to,  and  acquire  equity  interests  in,  banks  and  other
depository institutions and holding companies controlling such entities.

  (i) The general partner of BF III is MidBanc III L.P.  ("MidBanc III"),  whose
principal  business is to be a general partner of BF III. The general partner of
BF IV is MidBanc IV L.P.  ("MidBanc IV"),  whose  principal  business is to be a
general  partner  of BF  IV.  The  general  partner  of BF V is  MidBanc  V L.P.
("MidBanc  V"),  whose  principal  business is to be a general  partner of BF V.
MidBanc III, IV, and V are Illinois limited partnerships.

  (ii) The  general  partner of  MidBanc  III is ChiCorp  Management  III,  Inc.
("Management  III"),  whose  principal  business  is to be a general  partner of
MidBanc III. The general  partner of MidBanc IV is ChiCorp  Management  IV, Inc.
("Management  IV"),  whose  principal  business  is to be a general  partner  of
MidBanc IV. The general  partner of MidBanc V is The Banc Funds Company,  L.L.C.
("Management V"), whose principal business is to be a general partner of MidBanc
V. Management III, IV, and V are Illinois corporations.

  (iii) The executive  officers and  directors of Management  III, IV, and V are
the same and are composed of:

     Name and                                       Offices in
Present Principal                                   Management
    Occupation                                     III, IV and V
- -----------------                                 ----------------

Joan W. Moore                                        Secretary
Member, The Banc Funds                               and Director
Company, L.L.C. ("TBFC")

Charles J. Moore                                     President, Treasurer,
Manager, BF III, T III,                              and Director
BF IV, T IV, and BF V

  (iv) The sole  stockholder  of Management  III, IV, and V is TBFC, an Illinois
limited liability company which is controlled by Charles J. Moore. Mr. Moore has
been the manager of the investment  decisions for each of BF III, BF IV, BF V, T
III, T IV, and T V since their respective inceptions.  As manager, Mr. Moore has
voting and  dispositive  power over the securities of the issuer held by each of
those  entities.  As the  controlling  member of TBFC,  Mr.  Moore will  control
Management III, IV, and V, and therefore each

                                                        7

<PAGE>



of the  Partnership  entities  directly  and  indirectly  controlled  by each of
Management III, IV, and V.

  (v) The investment manager of T III, T IV, and T V is TBFC under an Investment
Management Agreement with each Trust. Charles J. Moore, as portfolio manager for
T III,  T IV,  and T V, has  voting  and  dispositive  power  over the  issuer's
securities held by such trusts.

  (b) and (c) The address of the principal  business and principal  office of BF
III,  T III,  BF IV, T IV,  BF V, T V,  MidBanc  III,  MidBanc  IV,  MidBanc  V,
Management III,  Management IV,  Management V, and TBFC and the business address
of each of the persons named in paragraph (a)(iii) is 208 S.
LaSalle Street, Chicago, IL 60604.

  (d) and (e) During the last five years,  none of the persons  named herein has
been  convicted in any criminal  proceeding  (excluding  traffic  violations  or
similar misdemeanors),  or been a party to any civil proceeding of a judicial or
administrative  body of competent  jurisdiction as a result of which such person
was or is  subject  to a  judgement,  decree  or final  order  enjoining  future
violations  of, or prohibiting  or mandating  activities  subject to, federal or
state securities laws or finding any violation with respect to such laws.

  (f) Each of the persons named in  paragraphs  (a)(iv) and (vi) is a citizen of
the United States of America.


Item 3.  Source and Amount of Funds or other Consideration.

  An  aggregate  of  $2,543,035  from the  capital of the Funds has been used in
making purchases of 137,650 shares of Common Stock of MDB.


Item 4.  Purpose of Transaction.

  The Funds  acquired the Common  Stock of MDB  reported  herein for purposes of
investment.  The Funds may, in the future,  purchase additional shares of Common
Stock of MDB or sell such securities.

  The Funds do not have any present  plan or proposal  which would  relate to or
result in  transactions  of the kind  described in paragraphs (a) through (j) of
Item 4 of Schedule 13d-101 of the Securities and Exchange Commission.  The Funds
reserve the right, in the future, to adopt such plans or proposals.


Item 5.  Interest in Securities of the Issuer.

  (a) An aggregate of 137,650 shares of Common Stock are  beneficially  owned by
the Funds.  Such  shares of Common  Stock  represent  approximately  6.9% of the
Common Stock of MDB  outstanding as of October 30, 1998. Of said shares,  12,084
shares  of  Common  Stock  are  beneficially  owned  by BF  III  (0.61%  of  the
outstanding shares),  while 37,041 shares of Common Stock are beneficially owned
by T III (1.86% of the outstanding shares),  while 14,744 shares of Common Stock
are beneficially owned by BF IV (0.74% of the outstanding shares), 48,581 shares
of Common Stock are beneficially owned by T IV (2.44% of the outstanding shares,
and 25,200 shares of common stock are  beneficially  owned by BF V (1.26% of the
outstanding shares). To the best knowledge and belief of the Funds, no

                                                        8

<PAGE>



securities  of MDB are owned by any of the other  persons  named in Item 2 or by
any persons  who  together  with any of the  persons  named in Item 2 comprise a
group within the meaning of Section 13(d) (3) of the Securities  Exchange Act of
1934, as amended. Anything to the contrary in this Schedule 13D notwithstanding,
each  Fund  disclaims  beneficial  ownership  of  the  shares  of  Common  Stock
beneficially owned by the other Fund.

  (b) The Funds have the sole power to vote or to direct the vote,  and the sole
power to dispose or to direct the disposition of, all of the shares beneficially
owned by them as set forth in paragraph (a) above.

  (c) On October 27, 1998, the Funds' ownership of shares of Common Stock of MDB
increased by more than 1% of the adjusted outstanding shares of said class since
the Funds' last 13D filing.  The Funds have  purchased  and sold Common Stock on
the open market as described in the table below:

              Dollar         Number    Cost per
Date          Amount       of Shares     Share
- ----         -------       ---------     ------


BF III Purchases:

10/27/98    15,867.00       984         16.125


T III Purchases:

10/27/98    48,633.00      3,016        16.125


BF IV Purchases:

10/27/98     3,692.62        229        16.125


T IV Purchases:

10/27/98    12,432.37         771       16.125


BF V Purchases:

10/22/98    47,161.25       2,900        16.26
10/27/98   327,337.10      20,300        16.125
10/27/98    32,120.00       2,000        16.06

Item 6.  Contracts, Arrangements, Understanding or Relationships
         with Respect to Securities of the Issuer.

                          None

Item 7.  Material to be filed as exhibits.

                          None



                                                        9

<PAGE>



Signature.

   After  reasonable  inquiry  and to the best of my  knowledge  and  belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.

November 5, 1998


BANC FUND  III L.P.
By MIDBANC III L.P.,
   general partner
By CHICORP MANAGEMENT III, INC.,
   general partner
By The Banc Funds Company, L.L.C.,
   Owner
By /s/ Charles J. Moore
   --------------------------
   Charles J. Moore, President


BANK FUND III TRUST
By THE BANC FUNDS COMPANY, L.L.C.,
   Investment Manager
By /s/ Charles J. Moore
   --------------------------
   Charles J. Moore, President


BANC FUND IV L.P.
By MIDBANC IV L.P.,
   general partner
By CHICORP MANAGEMENT IV, INC.,
   general partner
By The Banc Funds Company, L.L.C.,
   Owner
By /s/ Charles J. Moore
   --------------------------
   Charles J. Moore, President


BANC FUND IV TRUST
By THE BANC FUNDS COMPANY, L.L.C.,
   Investment Manager
By /s/ Charles J. Moore
   --------------------------
   Charles J. Moore, President

BANC FUND V L.P.
By MIDBANC V L.P.,
   general partner
By The Banc Funds Company, L.L.C.,
   Its general partner
By The Banc Funds Company, L.L.C.,
   Owner
By /s/ Charles J. Moore
   --------------------------
   Charles J. Moore, President

                                                        10

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