ZENITH NATIONAL INSURANCE CORP
DEF 14A, 1998-03-30
FIRE, MARINE & CASUALTY INSURANCE
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<PAGE>
                            SCHEDULE 14A INFORMATION
 
                  Proxy Statement Pursuant to Section 14(a) of
             the Securities Exchange Act of 1934 (Amendment No.  )
 
    Filed by the Registrant /X/
 
    Filed by a Party other than the Registrant / /
 
    Check the appropriate box:
    / /  Preliminary Proxy Statement
    / /  Confidential, for Use of the Commission Only (as permitted by Rule
         14a-6(e)(2))
    /X/  Definitive Proxy Statement
    / /  Definitive Additional Materials
    / /  Soliciting Material Pursuant to Rule 14a-11(c) or
         Rule 240.14a-12
 
                               ZENITH NATIONAL INSURANCE CORP.
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)
 
                               ZENITH NATIONAL INSURANCE CORP.
- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
/X/  No fee required.
/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(4)
     and 0-11.
     1) Title of each class of securities to which transaction applies:
        ------------------------------------------------------------------------
     2) Aggregate number of securities to which transaction applies:
        ------------------------------------------------------------------------
     3) Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the
        filing fee is calculated and state how it was determined):
        ------------------------------------------------------------------------
     4) Proposed maximum aggregate value of transaction:
        ------------------------------------------------------------------------
     5) Total fee paid:
        ------------------------------------------------------------------------
/ /  Fee paid previously with preliminary materials:
     ---------------------------------------------------------------------------
 
/ /  Check box if any part of the fee is offset as provided by Exchange Act Rule
     0-11(a)(2) and identify the filing for which the offsetting fee was paid
     previously. Identify the previous filing by registration statement number,
     or the Form or Schedule and the date of its filing.
 
     1) Amount Previously Paid:
        ------------------------------------------------------------------------
     2) Form, Schedule or Registration Statement No.:
        ------------------------------------------------------------------------
     3) Filing Party:
        ------------------------------------------------------------------------
     4) Date Filed:
        ------------------------------------------------------------------------
<PAGE>
 
                                                            [LOGO]
                                              Zenith National Insurance Corp.
                                              21255 Califa Street
                                              Woodland Hills, California 91367
                                              Telephone (818) 713-1000
    NOTICE OF ANNUAL MEETING
- --------------------------------------------------------------------------------
 
    The Annual Meeting of Stockholders of Zenith National Insurance Corp.
("Zenith") will be held at the offices of Zenith, 21255 Califa Street, Woodland
Hills, California, on Wednesday, May 20, 1998, at 9:00 a.m., for the following
purposes:
 
    1.  To elect a Board of nine (9) Directors.
 
    2.  To transact such other business as may properly come before the meeting
       and any adjournments thereof.
 
    Stockholders of record at the close of business on March 23, 1998, the
record date fixed by the Board of Directors for the Annual Meeting, are entitled
to notice of, and to vote at, such meeting.
 
                                          By Order of the Board of Directors
 
                                          John J. Tickner
                                          SECRETARY
 
Woodland Hills, California
Dated: March 24, 1998
 
    STOCKHOLDERS, WHETHER OR NOT THEY EXPECT TO ATTEND THE MEETING IN PERSON,
ARE REQUESTED TO COMPLETE, DATE, SIGN AND RETURN THE ENCLOSED FORM OF PROXY IN
THE ACCOMPANYING POSTPAID AND PRE-ADDRESSED ENVELOPE. THE PROXY IS REVOCABLE AT
ANY TIME PRIOR TO THE EXERCISE THEREOF BY WRITTEN NOTICE TO ZENITH, AND
STOCKHOLDERS WHO ARE PRESENT AT THE MEETING MAY WITHDRAW THEIR PROXIES AND VOTE
IN PERSON IF THEY SO DESIRE.
<PAGE>
                        ZENITH NATIONAL INSURANCE CORP.
                              21255 Califa Street,
                        Woodland Hills, California 91367
 
                            ------------------------
 
                                PROXY STATEMENT
 
                            ------------------------
 
                                     VOTING
 
    This Proxy Statement is furnished in connection with the solicitation by the
Board of Directors of Zenith National Insurance Corp. ("Zenith") of proxies to
be voted at the Annual Meeting of Stockholders of Zenith to be held on
Wednesday, May 20, 1998, at 9:00 a.m., and at any adjournments thereof (the
"Annual Meeting"). Any proxy given pursuant to this solicitation may be revoked
at any time prior to its exercise by written notice to Zenith, and the persons
executing the same, if in attendance at the Annual Meeting, may vote in person
instead of by proxy. Unless authority therefor is withheld, all proxies will be
voted as provided therein. In addition to solicitation of proxies by mail,
officers and regular employees of Zenith and its subsidiaries, who will receive
no additional compensation therefor, may solicit proxies by telephone, telegram
or personal interview. The subsidiaries of Zenith are Zenith Insurance Company
("Zenith Insurance"), CalFarm Insurance Company ("CalFarm"), Cal-Ag Insurance
Services, Inc., CalFarm Annuity Service Company, CalFarm Insurance Agency,
CalRehab Services, Inc., Perma-Bilt, a Nevada Corporation, Zenith Insurance
Company of Florida, Zenith Insurance Management Services, Inc., Zenith Star
Insurance Company, Zenith Risk Management, Inc., and ZNAT Insurance Company. The
cost of this solicitation will be borne by Zenith. In addition, Zenith will
reimburse brokerage houses and other custodians, nominees and fiduciaries for
expenses incurred in forwarding solicitation materials to stockholders.
 
    The approximate date on which this Proxy Statement and accompanying form of
proxy are first being sent to stockholders is March 30, 1998.
 
    Only stockholders of record at the close of business on March 23, 1998, the
record date for the Annual Meeting (the "Record Date"), are entitled to notice
of and to vote at such meeting. On such date, Zenith had outstanding 17,002,864
shares of common stock, $1.00 par value per share (the "Common Stock"). Each
share of Common Stock entitles the record holder to one vote on all matters.
With respect to the election of Directors only, however, every stockholder may
cumulate his votes with respect to candidates whose names have been placed in
nomination prior to the vote if, but only if, any stockholder has given notice
at the Annual Meeting prior to voting of his intention to cumulate his votes. In
the event there is cumulative voting for Directors, each stockholder will be
entitled to give one candidate the number of votes equal to the number of
Directors to be elected multiplied by the number of votes to which the
stockholder's shares are entitled, or to distribute his votes on the same
principle among as many candidates as such stockholder thinks fit. In the event
the election of Directors is to proceed with cumulative voting, the holder of
any proxy given pursuant to this solicitation will have the authority to
cumulate the votes to which shares covered by the proxy are entitled and to
distribute the votes among the candidates for election as the holder of the
proxy sees fit. The presence, in person or by proxy, of stockholders holding a
 
                                       1
<PAGE>
majority of the issued and outstanding shares of Common Stock entitled to vote
shall constitute a quorom. Election of Directors shall be decided by plurality
vote.
 
    The Board of Directors knows of no matters to come before the Annual Meeting
other than the matters referred to in this Proxy Statement. If, however, any
matters properly come before the meeting, it is the intention of each of the
persons named in the accompanying proxy to vote such proxies in accordance with
his best judgment thereon. Any such matter submitted for stockholder approval
requires the affirmative vote of the majority of shares present in person or
represented by proxy at the meeting and entitled to vote on the subject matter.
 
    Abstentions and broker non-votes (except on matters for which brokers lack
discretionary authority to vote under New York Stock Exchange rules) will be
counted and will have the same effect as "no" votes.
 
                         SECURITY OWNERSHIP OF CERTAIN
                        BENEFICIAL OWNERS AND MANAGEMENT
 
    The following table contains certain information at the Record Date as to:
(1) all persons who, to the knowledge of Zenith, were the beneficial owners of
more than 5% of the outstanding shares of Common Stock, (2) each of the
Executive Officers named in the Summary Compensation Table, (3) each of the
Directors of Zenith and (4) all Executive Officers and Directors as a group. The
persons named hold sole voting and investment power with respect to the shares
shown opposite their respective names, unless otherwise indicated. The
information with respect to each person specified is as supplied or confirmed by
such person.
 
<TABLE>
<CAPTION>
                                                      AMOUNT AND NATURE OF     PERCENT
NAME AND ADDRESS OF BENEFICIAL OWNER                BENEFICIAL OWNERSHIP (1)   OF CLASS
- --------------------------------------------------  ------------------------   --------
<S>                                                 <C>                        <C>
Reliance Insurance Company(2)(3)..................             6,574,445          38.7%
  3 Parkway
  Philadelphia, PA 19102
Royce Group(4)....................................             1,093,600           6.4%
  1414 Avenue of the Americas
  New York, New York 10019
Harvey L. Silbert(3)(5)(6)........................             1,053,640           6.2%
  10100 Santa Monica Blvd.
  Suite 2200
  Los Angeles, CA 90067
Stanley R. Zax(3)(5)(7)...........................               648,564           3.7%
  21255 Califa Street
  Woodland Hills, CA 91367
Jack M. Ostrow(3)(5)(8)...........................                65,000             *
  9601 Wilshire Blvd.
  Beverly Hills, CA 90210
James P. Ross(9)..................................                52,094             *
  21255 Califa Street
  Woodland Hills, CA 91367
Fredricka Taubitz(10).............................                46,840             *
  21255 Califa Street
  Woodland Hills, CA 91367
Keith E. Trotman(11)..............................                41,866             *
  21255 Califa Street
  Woodland Hills, CA 91367
</TABLE>
 
                                       2
<PAGE>
<TABLE>
<CAPTION>
                                                      AMOUNT AND NATURE OF     PERCENT
NAME AND ADDRESS OF BENEFICIAL OWNER                BENEFICIAL OWNERSHIP (1)   OF CLASS
- --------------------------------------------------  ------------------------   --------
<S>                                                 <C>                        <C>
John J. Tickner(12)...............................                21,587             *
  21255 Califa Street
  Woodland Hills, CA 91367
Gerald Tsai, Jr.(5)...............................                 5,000             *
  200 Park Ave.
  New York, New York 10166
Max M. Kampelman(5)...............................                 4,992             *
  1001 Pennsylvania Avenue N.W.
  Washington D.C. 20004
William Steele Sessions(5)(13)....................                 1,461             *
  Weston Centre
  112 East Pecan St.
  San Antonio, TX 78205
George E. Bello(5)(14)............................                     0             0
  Park Avenue Plaza
  55 East 52nd Street
  New York, NY 10055
Robert M. Steinberg(5)(14)........................                     0             0
  Park Avenue Plaza
  55 East 52nd Street
  New York, NY 10055
Saul P. Steinberg(5)(14)(15)......................             6,574,445          38.7%
  Park Avenue Plaza
  55 East 52nd Street
  New York, NY 10055
All Executive Officers and Directors as a group
(14 persons)(16)..................................             8,517,719          48.5%
</TABLE>
 
- ------------------------
*   Less than 1%
 
(1) Subject to applicable community property and similar statutes.
 
(2) Number of shares shown includes 39,110 shares held by Reliance National
    Insurance Company of New York and 39,110 shares held by United Pacific
    Insurance Company of New York, both wholly owned subsidiaries of Reliance
    Insurance Company. Reliance Insurance Company is a wholly-owned subsidiary
    of Reliance Financial Services Corporation, which is a wholly-owned
    subsidiary of Reliance Group Holdings, Inc. Saul P. Steinberg, members of
    his family and four separate trusts own approximately 44.4% of the common
    stock of Reliance Group Holdings, Inc. and, as a result of such stock
    holdings, Saul P. Steinberg may be deemed to control Reliance Group
    Holdings, Inc. Pursuant to an Amended Exemption issued to Reliance Insurance
    Company by the Insurance Commissioner of the State of California, Reliance
    Insurance Company has agreed that it will not vote shares in excess of 28.7%
    of the outstanding Common Stock unless it obtains the Insurance
    Commissioner's consent or qualifies for an exemption from such consent.
 
(3) Reliance Insurance Company and each of Jack M. Ostrow, Harvey L. Silbert
    (individually and as trustee of a family trust) and Stanley R. Zax were
    granted certain rights to require Zenith to register for sale, under the
    Securities Act of 1933, shares of Common Stock beneficially owned by each of
    them. Zenith granted these rights in connection with the sale in February
    1981 of an aggregate of 1,387,375 shares of Common Stock (20.5% of the then
    outstanding shares) to Reliance Insurance Company by certain selling
    stockholders, including Messrs. Ostrow, Silbert and Zax.
 
                                       3
<PAGE>
(4) On February 19, 1998, Zenith received a copy of an information statement on
    Schedule 13G filed with the United States Securities and Exchange Commission
    on February 5, 1998 by a group consisting of Royce & Associates, Inc.
    ("Royce"), Royce Management Company ("RMC"), and Charles M. Royce. The
    information in the table is based on such filing. The filing indicates that
    Royce beneficially owns 1,042,900 shares, as to which it holds sole voting
    and dispositive power; that RMC beneficially owns 50,700 shares, as to which
    it holds sole voting and dispositive power; and that Charles M. Royce may be
    deemed to be a controlling person of Royce and RMC, and as such may be
    deemed to beneficially own the shares owned by Royce and RMC. Charles M.
    Royce holds no shares outside of Royce and RMC and disclaims beneficial
    ownership of the shares held by Royce and RMC.
 
(5) Director of Zenith.
 
(6) Number of shares shown includes 173,551 shares held by Mr. Silbert as
    trustee of certain family trusts, as to which shares Mr. Silbert disclaims
    beneficial ownership. Number of shares shown also includes 880,089 shares
    held by The Harvey L. and Lillian Silbert Family Trust, a revocable trust,
    of which Mr. Silbert is a trustee.
 
(7) Chief Executive Officer of Zenith. Number of shares shown includes 1,030
    shares owned by Mr. Zax as custodian for his adult children, as to which
    shares Mr. Zax disclaims beneficial ownership, and 400,000 shares, as to
    which options are or will become exercisable within sixty days after the
    Record Date.
 
(8) Number of shares shown consists of 65,000 shares held by The Ostrow Family
    Trust, a revocable trust, of which Mr. Ostrow is a trustee.
 
(9) Executive Officer of Zenith. Number of shares shown includes 50,000 shares,
    as to which options are or will become exercisable within sixty days after
    the Record Date.
 
(10) Executive Officer of Zenith. Number of shares shown includes 5,340 shares
    allocated to such Executive Officer's account in The Zenith 401(k) Plan and
    35,000 shares, as to which options are or will become exercisable within
    sixty days after the Record Date.
 
(11) Executive Officer of Zenith. Number of shares shown consists of 4,366
    shares allocated to such Executive Officer's account in The Zenith 401(k)
    Plan and 37,500 shares, as to which options are or will become exercisable
    within sixty days after the Record Date.
 
(12) Executive Officer of Zenith. Number of shares shown consists of 1,587
    shares allocated to such Executive Officer's account in The Zenith 401(k)
    Plan and 20,000 shares, as to which options are or will become exercisable
    within sixty days after the Record Date.
 
(13) Shares shown are held in Mr. Sessions' Simplified Employee Pension --
    Individual Retirement Account.
 
(14) Director of Reliance Insurance Company.
 
(15) Shares shown are those owned by Reliance Insurance Company and certain of
    its subsidiaries. See notes (2) and (3) above.
 
(16) Number of shares shown includes 544,500 shares, as to which options are or
    will become exercisable within sixty days after the Record Date. Number of
    shares shown also includes 6,574,445 shares owned by Reliance Insurance
    Company and certain of its subsidiaries. See notes (2), (3) and (15) above.
 
                                       4
<PAGE>
            SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE
 
    Section 16(a) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), and the regulations of the Securities and Exchange Commission
(the "Commission") thereunder require Zenith's Executive Officers and Directors,
and persons who own more than ten percent of a registered class of Zenith's
equity securities, to file reports of ownership and changes in ownership with
the Commission and the New York Stock Exchange and to furnish Zenith with copies
of all such forms they file.
 
    Based solely on its review of the copies of such forms received by it and
written representations from certain reporting persons, Zenith believes that,
during the year ended December 31, 1997, all filing requirements applicable to
its Executive Officers, Directors, and 10% stockholders were complied with,
except that due to inadvertent error, an Executive Officer, James P. Ross, did
not file a Form 4 reporting a cashless exercise of employee stock options to
acquire 5,000 shares of Common Stock, consisting of the exercise of the option
and an immediate sale of such shares through a broker. Mr. Ross has subsequently
filed a Form 5 reporting the cashless exercise.
 
                             ELECTION OF DIRECTORS
 
    It is the intention of the persons named in the enclosed proxy, unless
otherwise specifically instructed, to vote the proxies received by them for the
election of the nominees listed in the table below as Directors of Zenith. In
the event that there should be cumulative voting in the election of Directors,
as set forth in this Proxy Statement under "Voting" above, it is the intention
of such persons to distribute the votes represented by each proxy among such
nominees in such proportion as they see fit, unless otherwise specifically
instructed.
 
    All nominees have consented to being named herein and have indicated their
intention to serve if elected. In the unanticipated event that any of the
nominees becomes unable to serve as a Director, the proxies will be voted for a
substitute nominee in accordance with the best judgment of the person or persons
voting them.
 
    A Director of Zenith serves until the next Annual Meeting of Stockholders
and until his successor is elected and qualified.
 
    The nominees for Director listed below were designated by the Board of
Directors of Zenith. The information with respect to each nominee is as supplied
or confirmed by such nominee.
 
<TABLE>
<CAPTION>
                                    SERVED AS     POSITIONS AND        PRINCIPAL OCCUPATIONS AND          OTHER PUBLICLY HELD
                                    DIRECTOR    OFFICES HELD WITH        EMPLOYMENT DURING PAST          CORPORATIONS IN WHICH
            NAME              AGE     SINCE           ZENITH                   FIVE YEARS                  DIRECTORSHIPS HELD
- ----------------------------  ---   ---------  --------------------  ------------------------------  ------------------------------
<S>                           <C>   <C>        <C>                   <C>                             <C>
George E. Bello               62       May     Director of Zenith    Executive Vice President        Reliance Group Holdings, Inc.;
(1)                                   1984     and Zenith Insurance  and Controller of Reliance      Horizon Health Corporation;
                                                                     Group Holdings, Inc. for more   LandAmerica Financial Group,
                                                                     than the past five years (2)    Inc.; United Dental Care, Inc.
</TABLE>
 
                                       5
<PAGE>
<TABLE>
<CAPTION>
                                    SERVED AS     POSITIONS AND        PRINCIPAL OCCUPATIONS AND          OTHER PUBLICLY HELD
                                    DIRECTOR    OFFICES HELD WITH        EMPLOYMENT DURING PAST          CORPORATIONS IN WHICH
            NAME              AGE     SINCE           ZENITH                   FIVE YEARS                  DIRECTORSHIPS HELD
- ----------------------------  ---   ---------  --------------------  ------------------------------  ------------------------------
<S>                           <C>   <C>        <C>                   <C>                             <C>
Max M. Kampelman              77    February   Director of Zenith    Attorney, Of Counsel, since     None
                                      1989     and Zenith Insurance  March 1991, and Partner,
                                                                     January 1989 to March 1991,
                                                                     Fried, Frank, Harris, Shriver
                                                                     & Jacobson; Counselor of the
                                                                     Department of State and Head
                                                                     of the U.S. Delegation to
                                                                     Negotiations on Nuclear and
                                                                     Space Arms with the Soviet
                                                                     Union from January 1985 to
                                                                     January 1989
 
Jack M. Ostrow                76    September  Director of Zenith    Attorney and Certified Public   None
(1)                                   1977     and Zenith            Accountant for more than the
                                               Insurance, Chairman   past five years
                                               of Audit Committee,
                                               Member of
                                               Performance Bonus
                                               Committee
 
William Steele Sessions       67    September  Director of Zenith    Attorney, Sessions & Sessions,  The Kroll-O'Gara Company
                                      1993     and Zenith Insurance  L.C. since March 1995;
                                                                     Security Consultant since July
                                                                     1993; Director, Federal Bureau
                                                                     of Investigation from 1987 to
                                                                     1993
 
Harvey L. Silbert             85     January   Director of Zenith    Attorney, Of Counsel, Loeb &    None
(1)(3)                                1978     and Zenith            Loeb LLP since March 1991; Of
                                               Insurance, Member of  Counsel, Wyman, Bautzer,
                                               Performance Bonus     Kuchel & Silbert for more than
                                               Committee             five years prior to March
                                                                     1991; management of personal
                                                                     investments for more than the
                                                                     past five years
 
Robert M. Steinberg           55    February   Director of Zenith    President and Chief Operating   Reliance Group Holdings, Inc.;
(1)(4)                                1981     and Zenith Insurance  Officer of Reliance Group       LandAmerica Financial Group,
                                                                     Holdings, Inc. and Chairman of  Inc.
                                                                     the Board and Chief Executive
                                                                     Officer of Reliance Insurance
                                                                     Company for more than the past
                                                                     five years (2)
</TABLE>
 
                                       6
<PAGE>
<TABLE>
<CAPTION>
                                    SERVED AS     POSITIONS AND        PRINCIPAL OCCUPATIONS AND          OTHER PUBLICLY HELD
                                    DIRECTOR    OFFICES HELD WITH        EMPLOYMENT DURING PAST          CORPORATIONS IN WHICH
            NAME              AGE     SINCE           ZENITH                   FIVE YEARS                  DIRECTORSHIPS HELD
- ----------------------------  ---   ---------  --------------------  ------------------------------  ------------------------------
<S>                           <C>   <C>        <C>                   <C>                             <C>
Saul P. Steinberg             58    February   Director of Zenith    Chairman of the Board and       Reliance Group Holdings, Inc.;
(1)(4)(5)                             1981     and Zenith Insurance  Chief Executive Officer of      Symbol Technologies, Inc.
                                                                     Reliance Group Holdings, Inc.
                                                                     for more than the past five
                                                                     years (2)
 
Gerald Tsai, Jr.              69    December   Director of Zenith    Management of private           The Meditrust Companies;
                                      1991     and Zenith            investments since January       Proffitt's, Inc.; Rite Aid
                                               Insurance, Chairman   1989; Chairman, President, and  Corporation; Sequa
                                               of Performance Bonus  Chief Executive Officer of      Corporation; Triarc Companies,
                                               Committee             Delta Life Corporation,         Inc.; United Rentals, Inc.
                                                                     February 1993 to October 1997;
                                                                     Chairman and CEO, Primerica
                                                                     Corp., February 1987 to
                                                                     December 1988
 
Stanley R. Zax                60      July     Chairman of the Board and President of Zenith and     None
(1)                                   1977     Zenith Insurance for more than the past five years;
                                               Chairman of the Board of CalFarm Life Insurance
                                               Company for more than five years prior to December
                                               1995; Chairman of the Board and President of CalFarm
                                               for more than five years prior to January 1995; and
                                               Chairman of the Executive Committee of the Board of
                                               Directors of CalFarm since January 1995 (6)
</TABLE>
 
- ------------------------------
 
(1) In connection with the sale in February 1981 of an aggregate of 1,387,375
    shares of Common Stock (20.5% of the then outstanding shares) to Reliance
    Insurance Company by certain selling stockholders, including Messrs. Ostrow,
    Silbert and Zax, the selling stockholders agreed to use their best efforts
    to expand the Boards of Directors of Zenith and Zenith Insurance and to
    cause (so long as Reliance Insurance Company owns at least 10% of Zenith's
    outstanding Common Stock) the election thereto of three qualified persons
    designated by Reliance Insurance Company. George E. Bello, Robert M.
    Steinberg and Saul P. Steinberg have been so designated.
 
(2) Reliance Insurance Company, Reliance Group Holdings, Inc. and Reliance
    Financial Services Corporation are insurance and insurance holding
    companies. Based on Reliance Insurance Company's and certain of its
    subsidiaries' holdings of Common Stock, Reliance Insurance Company, Reliance
    Group Holdings, Inc., and Reliance Financial Services Corporation may be
    deemed to be affiliates of Zenith.
 
(3) Mr. Silbert is of counsel to the law firm of Loeb & Loeb LLP, which
    performed certain legal services for Zenith in 1997.
 
(4) Robert M. Steinberg and Saul P. Steinberg are brothers.
 
(5) On July 30, 1993, Telemundo Group, Inc. ("Telemundo") consented to the entry
    of an order for relief under Chapter 11 of the United States Bankruptcy
    Code. On December 30, 1994, Telemundo's Plan of Reorganization was
    consummated. Saul P. Steinberg previously served as President (February 1990
    through February 1991) and Chief Executive Officer (February 1990 through
    May 1992) of Telemundo.
 
(6) Zenith Insurance and CalFarm are wholly-owned subsidiaries of Zenith, as was
    CalFarm Life Insurance Company until its sale by Zenith in December 1995.
 
                                       7
<PAGE>
    The Board of Directors communicated frequently during the year ended
December 31, 1997, held five formal meetings, and also took action by unanimous
written consent. Zenith's Board of Directors has a standing Audit Committee and
a Performance Bonus Committee but has no nominating committee or any committee
performing similar functions. The sole member and Chairman of the Audit
Committee is currently Mr. Ostrow. The functions of the Audit Committee are to
recommend to the Board of Directors retention or change of Zenith's independent
auditors; to consider the range of audit and non-audit fees; to review the
independence of the auditors; to meet with them and Zenith's internal audit
personnel to discuss and review the results of their respective examinations and
audit plans for the ensuing year; to review the adequacy of Zenith's system of
internal accounting controls and like matters. The Audit Committee is also
authorized to review and discuss other matters as it deems appropriate. During
1997, the Audit Committee communicated frequently with Zenith's financial and
accounting and internal audit department personnel and independent auditors,
including at five formal meetings. The Performance Bonus Committee, consisting
of Messrs. Ostrow, Silbert, and Tsai (Chairman), is responsible for
performance-based compensation plans for Executive Officers, namely, the
Executive Officer Bonus Plan and the 1996 Employee Stock Option Plan as it
relates to grants thereunder to Executive Officers. The Board of Directors
retains responsibility for all other compensation matters. The Performance Bonus
Committee held two formal meetings in 1997, but communicated frequently. Each
Director, except Robert M. Steinberg, attended at least 75% of the aggregate of
all meetings of the Board of Directors and of any committees thereof on which
such Director served.
 
                            DIRECTORS' COMPENSATION
 
    Zenith pays each Director (other than Mr. Zax, who receives no additional
compensation therefor) a fee of $50,000 per annum for serving as a member of the
Board of Directors. Mr. Ostrow also receives a fee of $25,000 per annum for
serving as the Chairman and sole member of Zenith's Audit Committee.
 
                             EXECUTIVE COMPENSATION
 
    The following table sets forth information regarding the compensation paid
during the 1995, 1996, and 1997 fiscal years to Zenith's Chief Executive Officer
and its four other most highly compensated Executive Officers serving as of
December 31, 1997 (the "Named Executive Officers").
 
                                       8
<PAGE>
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                                                  LONG TERM
                                                                                                 COMPENSATION
                                                                                                --------------
                                                                                                    AWARDS
                                                             ANNUAL COMPENSATION                --------------
                                                ---------------------------------------------     SECURITIES
                                                                               OTHER ANNUAL       UNDERLYING      ALL OTHER
                                                                               COMPENSATION        OPTIONS/      COMPENSATION
      NAME AND PRINCIPAL POSITION         YEAR  SALARY ($)  BONUS ($)(1)           ($)             SARS (#)         ($)(4)
- ----------------------------------------  ----  ----------  ------------     ----------------   --------------   ------------
<S>                                       <C>   <C>         <C>              <C>                <C>              <C>
STANLEY R. ZAX                            1997  $1,025,248  $         0          $      0                0         $36,966
Chairman of the Board and                 1996   1,027,320    1,000,000 (2)             0        1,000,000          31,926
President of Zenith and                   1995   1,027,320    1,000,000                 0                0          31,926
Zenith Insurance,
Chairman of the Executive Committee of
the Board of Directors of CalFarm
 
FREDRICKA TAUBITZ                         1997  $  391,600  $         0          $      0           25,000         $ 8,926
Executive Vice President and              1996     391,600      200,000                 0                0           8,926
Chief Financial Officer of Zenith         1995     380,000      125,000                 0           20,000           8,840
and Zenith Insurance, Senior
Vice President of CalFarm
 
KEITH E. TROTMAN                          1997  $  340,100  $   200,000          $      0                0         $10,366
Senior Vice President of Zenith           1996     340,100      200,000                 0           10,000           7,846
Insurance and CalFarm                     1995     330,600      200,000                 0           20,000           7,777
 
JAMES P. ROSS                             1997  $  283,717  $         0          $ 15,588(3)             0         $10,343
Senior Vice President of                  1996     283,717      100,000                 0                0           7,971
Zenith, Zenith Insurance and              1995     263,717      250,000             8,400(3)        50,000           8,597
CalFarm
 
JOHN J. TICKNER                           1997  $  252,939  $         0          $      0           25,000         $20,991
Senior Vice President and                 1996     253,704      100,000                 0           10,000          20,991
Secretary of Zenith, Senior Vice          1995     245,371       75,000                 0           15,000          20,905
President, General Counsel and
Secretary of Zenith Insurance and
CalFarm
</TABLE>
 
- ------------------------------
 
(1) All amounts shown were determined and paid under Zenith's Executive Officer
    Bonus Plan except for Mr. Trotman's 1997 bonus, which was discretionary.
 
(2) Although Mr. Zax was paid a bonus of $1,000,000 for his services in Fiscal
    Year 1996, this amount did not appear in the Summary Compensation Table
    contained in the Proxy Statement for Zenith's 1997 Annual Stockholders'
    Meeting held May 15, 1997 because this bonus was not determined and paid
    under the Executive Officer Bonus Plan until late in 1997. See "Board of
    Directors' Report on Executive Compensation; Performance Bonus Committee
    Report on Performance Based Compensation Plans for Executive Officers."
 
(3) Amount shown for 1997 represents reimbursement of certain income tax
    liabilities; amount shown for 1995 reflects Zenith's matching contribution
    under its Employee Stock Purchase Plan.
 
(4) The following amounts are included in the above table: (a) Zenith's matching
    contributions made in Fiscal Year 1997 to The Zenith 401(k) Plan, as
    follows: Stanley R. Zax, none; Fredricka Taubitz, $3,166; Keith E. Trotman,
    $3,166; James P. Ross, none; and John J. Tickner, $3,166; (b) the dollar
    value of insurance premiums paid in Fiscal Year 1997 by, or on behalf of,
    Zenith with respect to term life insurance for the benefit of the Named
    Executive Officer, as follows: Stanley R. Zax, $14,040; Fredricka Taubitz,
    $5,760; Keith E. Trotman, $7,200; James P. Ross, $2,940; and John J.
    Tickner, $4,500; and (c) the dollar value of the benefit to the Named
    Executive Officer of premiums paid by, or on behalf of, Zenith during Fiscal
    Year 1997, with respect to certain split dollar life insurance policies, as
    follows: Stanley R. Zax, $22,926; Fredricka Taubitz, none; Keith E. Trotman,
    none; James P. Ross, $7,403; and John J. Tickner, $13,325.
 
                                       9
<PAGE>
                     OPTION/SAR GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                               INDIVIDUAL GRANTS                        POTENTIAL REALIZABLE
                           ---------------------------------------------------------      VALUE AT ASSUMED
                              NUMBER OF       % OF TOTAL                                  ANNUAL RATES OF
                             SECURITIES      OPTIONS/SARS                             STOCK PRICE APPRECIATION
                             UNDERLYING       GRANTED TO    EXERCISE OR                 FOR OPTION TERM (4)
                            OPTIONS/SARS     EMPLOYEES IN   BASE PRICE    EXPIRATION  ------------------------
          NAME             GRANTED (#) (1)   FISCAL YEAR    ($/SH) (2)     DATE (3)     5% ($)       10% ($)
- -------------------------  ---------------   ------------   -----------   ----------  -----------  -----------
<S>                        <C>               <C>            <C>           <C>         <C>          <C>
Stanley R. Zax                 --               --              --            --          --           --
Fredricka Taubitz              25,000             4.2%       $ 26.34375    12/10/02   $   181,957  $   402,078
Keith E. Trotman               --               --              --            --          --           --
James P. Ross                  --               --              --            --          --           --
John J. Tickner                25,000             4.2%       $ 26.34375    12/10/02   $   181,957  $   402,078
</TABLE>
 
- ------------------------
 
(1) Options granted in 1997 are not exercisable during the first year following
    the date of grant. Each option becomes exercisable as to 25% of the total
    number of underlying shares in the second year following the date of grant
    and as to an additional 25% in each of the next three years.
 
(2) All options were granted with an option price equal to the market price of
    the Common Stock on the date of grant (based on the average of the high and
    low prices on the New York Stock Exchange for such date).
 
(3) The options granted in 1997 expire on the earlier to occur of (a) five years
    from the date of grant, (b) in the event of termination of the optionee's
    employment, three months from the date of such termination, or (c) in the
    event of the optionee's death, one year from the date thereof and, following
    termination of employment or death, may be exercised only to the extent they
    were exercisable on the date of the optionee's termination of employment or
    death.
 
(4) The potential gains shown are net of the option exercise price and do not
    include the effect of any taxes associated with exercise. The amounts shown
    are for the assumed rates of appreciation only, do not constitute
    projections of future stock price performance, and may not necessarily be
    realized. Actual gains, if any, on stock option exercises depend on the
    future performance of the Common Stock, continued employment of the optionee
    through the term of the option, and other factors.
 
              AGGREGATED OPTION/SAR EXERCISES IN LAST FISCAL YEAR
                     AND FISCAL YEAR END OPTION/SAR VALUES
 
<TABLE>
<CAPTION>
                                                                                               VALUE OF UNEXERCISED
                                                                 NUMBER OF SECURITIES              IN-THE-MONEY
                                                                UNDERLYING UNEXERCISED        OPTIONS/SARS AT FY-END
                                   SHARES                     OPTIONS/SARS AT FY-END (#)              ($)(1)
                                ACQUIRED ON       VALUE       ---------------------------   ---------------------------
             NAME               EXERCISE (#)   REALIZED ($)   EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
- ------------------------------  ------------   ------------   -----------   -------------   -----------   -------------
<S>                             <C>            <C>            <C>           <C>             <C>           <C>
Stanley R. Zax                     --              --          200,000          800,000      $425,000      $1,700,000
Fredricka Taubitz                  20,000        $197,807       35,000           35,000      $121,562      $   41,875
Keith E. Trotman                   --              --           37,500           17,500      $121,562      $   41,875
James P. Ross                       5,000        $ 52,737       50,000           25,000      $184,374      $  104,687
John J. Tickner                    --              --           20,000           40,000      $ 63,281      $   31,406
</TABLE>
 
- ------------------------
 
(1) Based on the $25.75 closing price of the Common Stock on the New York Stock
    Exchange on December 31, 1997.
 
                                       10
<PAGE>
              EMPLOYMENT AGREEMENTS AND TERMINATION OF EMPLOYMENT
                       AND CHANGE IN CONTROL ARRANGEMENTS
 
    Effective December 11, 1997, Zenith entered into an amended and restated
employment agreement with Mr. Zax, which extends the expiration date of his
employment agreement from December 31, 1998 to December 31, 2002. The amended
and restated employment agreement provides for an annual base compensation plus
an annual bonus to be determined under Zenith's Executive Officer Bonus Plan.
Under the agreement, Mr. Zax's base compensation is continued at $1,000,000,
subject to such increases as the Board of Directors may determine from time to
time. Upon Mr. Zax's death, Zenith will continue to pay either his wife,
children or estate his base compensation and annual bonus for a period of twelve
months. If Mr. Zax's employment is terminated for disability, he will receive
his base compensation and annual bonus for a period of six months. If Mr. Zax's
employment is terminated for breach by him of his employment agreement, he will
receive his base compensation through the end of the month in which the
termination occurs. If his employment is terminated for any reason other than
for breach of his employment agreement, death, or disability, Zenith will pay
Mr. Zax his base compensation and annual bonus through the term of his
employment agreement. Upon a Change in Control (as defined in the employment
agreement) of Zenith, all stock options and stock appreciation rights granted to
Mr. Zax, to the extent not exercisable at such time, become immediately
exercisable. In addition, if Mr. Zax's employment is terminated subsequent to
any Change in Control either by Mr. Zax within 180 days of the Change in Control
or by Zenith for any reason other than disability or breach of his employment
agreement, Mr. Zax is entitled to receive Severance Payments (as defined below).
 
    Effective December 11, 1997, Zenith entered into an amended and restated
employment agreement with Ms. Taubitz, which extends the expiration date of her
employment agreement from October 1, 1998 to December 31, 2002. The amended and
restated employment agreement provides for an annual base compensation plus an
annual bonus to be determined under Zenith's Executive Officer Bonus Plan and
certain additional benefits. The base compensation is currently $391,000,
subject to such increases as the Board of Directors may determine from time to
time.
 
    Effective January 5, 1998, Zenith entered into an amended and restated
employment agreement with Mr. Tickner, which extends the expiration date of his
employment agreement from October 1, 1998 to March 1, 2001. The amended and
restated employment agreement provides for an annual base compensation plus an
annual bonus to be determined under Zenith's Executive Officer Bonus Plan and
certain additional benefits. The base compensation is currently $265,000,
subject to such increases as the Board of Directors may determine from time to
time.
 
    Zenith's employment agreements with Ms. Taubitz and Mr. Tickner provide that
if her or his employment is terminated by Zenith other than for cause or
disability, the executive is entitled to Severance Payments. In addition, each
of Ms. Taubitz and Mr. Tickner may terminate her or his employment with Zenith
and receive Severance Payments should (a) Mr. Zax cease, for any reason other
than death or disability, to be the full-time Chairman of the Board and
President of Zenith, (b) she or he be prohibited or restricted in the
performance of her or his duties, (c) any payment due her or him under her or
his agreement remain unpaid for more than 60 days, or (d) she or he give written
notice to Zenith of termination of her or his employment agreement within 180
days following a Change in Control (as defined in the employment agreements) of
Zenith.
 
                                       11
<PAGE>
    For purposes of the foregoing, "Severance Payments" include the following
benefits: (1) in the case of Mr. Tickner, all salary payments that would have
been payable to him for the greater of (a) the remaining term of the employment
agreement or (b) one year, plus a pro rata portion of any bonus that would have
been payable to him with respect to the year of termination; (2) in the case of
Mr. Zax and Ms. Taubitz, a cash lump sum payment equal to the greater of (a)
twice the sum of the executive's then current base compensation and the highest
annual bonus paid or payable during the three consecutive years immediately
preceding termination of employment or (b) the actuarial equivalent of the base
compensation and annual bonuses that would have been payable to the executive
under the remaining term of the employment agreement; (3) continuation of life,
disability, dental, accident and group health insurance benefits, plus an
additional amount necessary to reimburse the executive for any taxes
attributable solely to the executive's receipt of such benefits; (4) in the case
of Ms. Taubitz and Mr. Tickner, vesting of all stock option and similar rights;
and (5) an additional payment, if necessary, to assure that none of the above
benefits are subject to net reduction due to the imposition of excise taxes
under section 4999 of the Internal Revenue Code of 1986, as amended.
 
          COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
    In 1997, all decisions on Executive Officer compensation, other than
decisions related to performance-based compensation plans, were made by the
Board of Directors. Mr. Zax, Chairman of the Board and President, is a member of
the Board of Directors, and except with respect to his own compensation,
participated in the Board of Directors' deliberations concerning Executive
Officer compensation.
 
    The Performance Bonus Committee, consisting of Messrs. Ostrow, Silbert, and
Tsai, determines matters relating to performance-based compensation plans for
Executive Officers. Mr. Silbert is of counsel to the law firm of Loeb & Loeb
LLP, which performed certain legal services for Zenith in 1997.
 
       BOARD OF DIRECTORS' REPORT ON EXECUTIVE COMPENSATION; PERFORMANCE
                  BONUS COMMITTEE REPORT ON PERFORMANCE BASED
                   COMPENSATION PLANS FOR EXECUTIVE OFFICERS
 
    Zenith's entire Board of Directors made determinations with respect to
compensation of Executive Officers in 1997, except with respect to Mr. Zax's
compensation, which is established in Board of Directors' actions from which Mr.
Zax excuses himself and in which he does not participate, and except with
respect to matters related to performance-based compensation plans for Executive
Officers. The Performance Bonus Committee made determinations under
performance-based compensation plans for Executive Officers. The Board of
Directors' report on Executive Compensation and the Performance Bonus
Committee's report on its determinations shall not be deemed to be incorporated
by reference through any general statement incorporating by reference this proxy
statement into any filings under the Securities Act of 1933 or under the
Securities Exchange Act of 1934 and shall not otherwise be deemed to be filed
under such Acts.
 
    The Board of Directors' report on Executive Compensation follows:
 
    EXECUTIVE OFFICERS
 
    The level of compensation for Executive Officers of Zenith is intended to be
competitive (that is, "attractive") and to provide appropriate incentives.
Executive Officers of Zenith are generally compensated through salary, grants of
stock options, and bonuses under the Executive Officer Bonus Plan.
 
                                       12
<PAGE>
The Executive Officer Bonus Plan, approved by the stockholders of Zenith at the
1994 Annual Meeting, is administered by the Performance Bonus Committee. The
Performance Bonus Committee also grants stock options to Executive Officers
under Zenith's 1996 Employee Stock Option Plan. The report of the Performance
Bonus Committee follows this report.
 
    The level of an Executive Officer's base compensation is generally based on
a combination of (1) the performance of Zenith, (2) the performance of the
insurance subsidiary, if any, to which the Executive Officer is principally
assigned, and (3) a subjective and qualitative evaluation of the personal
contribution made by the Executive Officer to Zenith. Success in these areas
does not translate mechanically into compensation levels; the manner in which
these factors are taken into account is discretionary with the Board of
Directors and is not based on any formulaic weighting.
 
    The performance of Zenith is generally measured by the combined ratio of its
property and casualty insurance operations and by its overall profitability.
Zenith strives for and has achieved long term average combined ratios that are
about 100%. Zenith also strives for combined ratios that compare favorably in
both the short- and long-term with insurers primarily engaged in writing
workers' compensation insurance. In addition, Zenith endeavors to have loss
ratios that are among the lowest for the industry in any rolling previous five
year period. The performance of the Zenith insurance subsidiaries is generally
measured by their combined ratios and profitability, as applicable.
 
    With respect to the subjective and qualitative evaluation of an Executive
Officer's personal contribution to the business of Zenith, a variety of factors
are taken into account. These factors vary and include, but are not limited to,
the manner in which the Executive Officer favorably affects Zenith's combined
ratio and profitability. Equally, if not more, important is the manner in which
the Executive Officer performs in Zenith's environment, which fosters an
entrepreneurial spirit, teamwork, and a commitment to education. Zenith believes
an entrepreneurial spirit maximizes profits, promotes sound execution of good
business fundamentals, and maintains a pool of executive talent. Teamwork is
crucial to the effective and efficient implementation of Zenith's goals. A
commitment to education means a dedication to lifelong learning and training for
oneself and creating conditions so that the workforce is similarly dedicated.
Such dedication is critical to Zenith's ability to address changes in market
conditions and use such changes to its competitive advantage. In such an
environment, proactive and innovative approaches are strongly encouraged and
rewarded.
 
    On the operational side, activities that demonstrate an opportunistic
outlook, anticipation of changing business conditions and the development of
postures to take advantage of opportunities to increase short-and long-term
profits are rewarded. On the administrative side, efficiency, competence, strong
compliance efforts, anticipation and avoidance of problems, as well as
innovation, are rewarded.
 
    Certain of the Executive Officers are employed under employment agreements
that provide for minimum base compensation and annual bonuses. Determinations as
to salary increases for these Executive Officers, as well as those without
employment agreements, are discretionary and are not made on the basis of a
formulaic weighting of the factors described above. Bonuses are generally
determined for Executive Officers in accordance with the Executive Officer Bonus
Plan. However, the Board of Directors determined that a discretionary bonus
should be paid to Mr. Trotman for Fiscal Year 1997 outside of the Executive
Officer Bonus Plan because of the performance of Zenith's investment portfolio.
Mr. Trotman's primary responsibility is to oversee Zenith's investment
portfolio.
 
                                       13
<PAGE>
    In 1997, the combined ratio of Zenith's property and casualty operations was
above the combined ratio for the industry as a whole. Given this performance and
taking into account the subjective and qualitative evaluations of individual
Executive Officers, the level of each Executive Officer's base compensation was
set accordingly. Please see the separate report of the Performance Bonus
Committee for a discussion regarding the determination of annual bonuses for
Executive Officers for 1997 and for a discussion of stock options granted to
Executive Officers in 1997.
 
    STANLEY R. ZAX, CHIEF EXECUTIVE OFFICER
 
    Mr. Zax is never present when the Board of Directors deliberates with
respect to his compensation and, accordingly, does not participate in Board of
Directors' decisions on his own compensation.
 
    Mr. Zax's base salary for 1997 was specified in his four year amended and
restated employment agreement executed in 1994. Under the employment agreement,
increases in base compensation are at the discretion of the Board of Directors
and are not based on a formulaic weighting of factors. In determining whether to
grant any salary increase, the same performance criteria that are applied to
Executive Officers in general are applied to Mr. Zax. In 1997, the Board of
Directors extended Mr. Zax's employment agreement under the same terms and
conditions to December 31, 2002. Also, as with Executive Officers generally,
bonuses to Mr. Zax are determined in accordance with the Executive Officer Bonus
Plan.
 
    Taking the objective and subjective criteria described above into account,
the Board of Directors was generally satisfied with Mr. Zax's initiative and
leadership during 1997. However, the Board of Directors is concerned, as is Mr.
Zax, with certain aspects of Zenith's operations that have led to unsatisfactory
results. The Board of Directors concurs in Mr. Zax's appraisal of steps that
must be taken to address these issues and believes Mr. Zax's base compensation
should continue at its present level, with incentives and rewards to be earned
under the Executive Officer Bonus Plan.
 
    SECTION 162(m) POLICY
 
    Section 162(m) of the Internal Revenue Code of 1986, as amended, generally
limits the Federal income tax deduction that a public corporation may claim for
annual compensation paid to certain executive officers. The limitation with
respect to each affected Executive Officer is $1,000,000 per year. However, the
limitation does not apply to compensation which is performance-based, earned
under a plan approved by the corporation's stockholders and which satisfies
certain other conditions set forth in Section 162(m) and the regulations
thereunder. Stock option grants awarded to Executive Officers under Zenith's
1996 Employee Stock Option Plan and bonuses payable under the Executive Officer
Bonus Plan are intended to comply with Section 162(m). Accordingly, neither
income accruing to Executive Officers upon exercise of stock options nor the
amount of any bonus payment made to Executive Officers under the Executive
Officer Bonus Plan should be subject to the $1,000,000 limit on deductibility.
The Board of Directors has determined that it will pay Mr. Zax's annual salary
even though any portion in excess of $1,000,000 would not be deductible by
Zenith.
 
                     Stanley R. Zax, Chairman of the Board
 
George E. Bello                           Harvey L. Silbert
Max M. Kampelman                          Robert M. Steinberg
Jack M. Ostrow                            Saul P. Steinberg
William Steele Sessions                   Gerald Tsai, Jr.
 
                                       14
<PAGE>
    The Performance Bonus Committee's report of its determinations of
performance-based compensation for Executive Officers follows:
 
    The Performance Bonus Committee is responsible for administering the
Executive Officer Bonus Plan and for granting stock options to Executive
Officers under the 1996 Employee Stock Option Plan. In so doing, the Performance
Bonus Committee implements and reinforces the compensation philosophy of the
Board of Directors, as set out in the Board of Directors' Report on Executive
Compensation.
 
    EXECUTIVE OFFICER BONUS PLAN
 
    The Executive Officer Bonus Plan was approved by the stockholders at the
1994 Annual Meeting as a performance-based compensation plan. It provides for
bonuses to Executive Officers based upon attainment by Zenith in any fiscal year
of an objectively measured performance goal, namely a combined ratio that is
below the industry's combined ratio. The Executive Officer Bonus Plan provides
for bonuses to Executive Officers up to an amount equal to:
 
    100% of his or her salary at the beginning of the fiscal year if the Company
    Combined Ratio for such fiscal year is at least three percentage points, but
    less than five percentage points, below the Industry Combined Ratio or
 
    150% of his or her salary at the beginning of the fiscal year if the Company
    Combined Ratio for such fiscal year is at least five percentage points below
    the Industry Combined Ratio;
 
provided, however, in either instance, the Performance Bonus Committee may, in
its sole discretion, on a case by case basis, reduce such bonus by any amount.
 
    In 1997, Zenith's combined ratio was 103.4%; the industry's 1997 combined
ratio, as estimated and reported by A.M. Best Company, was 101.8%. Accordingly,
the objective performance goal under the Executive Officer Bonus Plan was not
met and no bonuses thereunder are payable to Executive Officers with respect to
Fiscal Year 1997.
 
STANLEY R. ZAX, CHIEF EXECUTIVE OFFICER
  PAYMENT OF FISCAL YEAR 1996 BONUS
 
    As previously reported in the Performance Bonus Committee's report for
Fiscal Year 1996, the objective performance goal under the Executive Officer
Bonus Plan had been met for Fiscal Year 1996 and each Executive Officer could
have received a maximum bonus equal to 150% of his or her salary in effect as of
January 1, 1996. Based on subjective and qualitative evaluations, bonuses for
Fiscal Year 1996 were paid to all Executive Officers, with the exception of Mr.
Zax. With respect to Mr. Zax, the Performance Bonus Committee had arrived at an
amount to be awarded him. However, Mr. Zax informed the Performance Bonus
Committee that he would not accept any bonus. The Performance Bonus Committee
took Mr. Zax's position into account, reconsidered its determination and decided
he would receive no bonus at that time. However, the Performance Bonus Committee
did retain the discretion to pay, at a future date, all or any portion of the
maximum bonus Mr. Zax could have received with respect to Fiscal Year 1996,
based on his performance.
 
    In December 1997, the Performance Bonus Committee conducted a subjective and
qualitative evaluation of the personal contributions of Mr. Zax, focusing on the
same factors as had been set out in the Board of Directors' report on Executive
Compensation for Fiscal Year 1996. The Performance Bonus Committee took
particular note of Mr. Zax's efforts in managing the performance of the
investment portfolio; actively seeking new opportunities, through acquisitions
or otherwise, to meet or anticipate
 
                                       15
<PAGE>
changing business conditions; reorganizing Zenith's California workers'
compensation operations for greater efficiency; and assembling and organizing a
team of senior executives to effect cultural and operational changes. Based on
such evaluation, the Performance Bonus Committee exercised its discretion and
determined that Mr. Zax would receive with respect to Fiscal Year 1996 a bonus
equal to 100% of his annual salary in effect as of the beginning of such year
($1,000,000).
 
STOCK OPTION GRANTS
 
    EXECUTIVE OFFICERS
 
    From time to time the Performance Bonus Committee grants options to
Executive Officers to purchase Common Stock. Options are considered a part of
compensation to recognize an Executive Officer's contribution and to reinforce
that Executive Officer's long term commitment to the success of Zenith. The
Performance Bonus Committee's determination to grant options to an Executive
Officer is based on the recommendation of the Chairman of the Board, subjective
measures and prior grants to that Executive Officer. Beyond these general
considerations, there is no particular formula governing the number of shares
awarded.
 
    In 1997, the following Named Executive Officers were granted options to
purchase Common Stock under the 1996 Employee Stock Option Plan, in the amounts
set forth below:
 
<TABLE>
<S>                                                    <C>        <C>
Fredricka Taubitz....................................     25,000  shares
 
John J. Tickner......................................     25,000  shares
</TABLE>
 
                           Gerald Tsai, Jr., Chairman
                                 Jack M. Ostrow
                               Harvey L. Silbert
 
                                       16
<PAGE>
                         STOCK PRICE PERFORMANCE GRAPH
 
    The Stock Price Performance Graph below compares the cumulative total
returns of the Common Stock, the Standard and Poor's 500 Stock Index ("S&P 500")
and the Standard and Poor's 500 Property-Casualty Insurance Index ("S&P PC") for
a five year period. Stock price performance is based on historical results and
is not necessarily indicative of future stock price performance. The following
graph assumes $100 was invested at the close of trading on the last trading day
preceding the first day of the fifth preceding fiscal year in the Common Stock,
the S&P 500, and the S&P PC. The calculation of cumulative total return assumes
reinvestment of dividends. The graph was prepared by Standard and Poor's
Compustat, which obtained factual materials from sources believed by it to be
reliable, but which disclaims responsibility for any errors or omissions
contained in such data. The Stock Price Performance Graph shall not be deemed
incorporated by reference through any general statement incorporating by
reference this proxy statement into any filings under the Securities Act of 1933
or under the Securities Exchange Act of 1934 and shall not otherwise be deemed
to be filed under such Acts.
 
                      COMPARATIVE FIVE-YEAR TOTAL RETURNS
                           ZENITH, S&P 500 AND S&P PC
                     (PERFORMANCE RESULTS THROUGH 12/31/97)
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
              ZNT      S&P 500    S&P PC
<S>        <C>        <C>        <C>
1992         $100.00    $100.00    $100.00
1993         $117.81    $110.08     $98.23
1994         $125.04    $111.53    $103.04
1995         $122.98    $153.45    $139.51
1996         $163.69    $188.68    $169.52
1997         $159.79    $251.63    $246.60
</TABLE>
 
                                       17
<PAGE>
                  INFORMATION RELATING TO INDEPENDENT AUDITORS
 
    Zenith's independent auditor for fiscal year 1997 was Coopers & Lybrand
L.L.P. and, upon the recommendation of the Audit Committee, the Board of
Directors of Zenith has selected Coopers & Lybrand L.L.P. as Zenith's
independent auditor for fiscal year 1998. Representatives of Coopers & Lybrand
L.L.P. are expected to be present at the Annual Meeting and will have an
opportunity to respond to appropriate questions and to make a statement if they
desire to do so. For information concerning Zenith's Audit Committee, see
"Election of Directors" above.
 
                    STOCKHOLDER PROPOSALS AT THE NEXT ANNUAL
                            MEETING OF STOCKHOLDERS
 
    Stockholders of Zenith who intend to submit proposals to Zenith's
stockholders at the next Annual Meeting of Stockholders to be held in 1999 must
submit such proposals to Zenith no later than December 1, 1998 in order for them
to be included in Zenith's proxy materials for such meeting. Stockholder
proposals should be submitted to Zenith National Insurance Corp., 21255 Califa
Street, Woodland Hills, California 91367, Attention: Secretary.
 
                                          By Order of the Board of Directors
 
                                          JOHN J. TICKNER
                                          SECRETARY
 
Dated: March 24, 1998
 
                                       18
d<PAGE>

                                    [LOGO]
                                     PROXY

               This Proxy is Solicited by the Board of Directors
                     of Zenith National Insurance Corp.
               for the Annual Meeting of Stockholders, May 20, 1998

    The undersigned stockholder hereby appoints Jack M. Ostrow, Harvey L. 
Silbert, and Stanley R. Zax and each or any of them (each with full power of 
substitution), proxies for the undersigned to vote all shares of Common Stock 
of Zenith National Insurance Corp. ("Zenith") owned by the undersigned at the 
Annual Meeting of Stockholders to be held on Wednesday, May 20, 1998, at 9:00 
a.m., at the offices of Zenith, 21255 Califa Street, Woodland Hills, 
California, and at any adjournments thereof, in connection with the matters 
set forth in the Notice of Annual Meeting and Proxy Statement dated March 24, 
1998 ("the Statement"), copies of which have been received by the 
undersigned.

THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN ACCORDANCE WITH THE 
INSTRUCTIONS OF THE STOCKHOLDER, BUT IF NO INSTRUCTIONS ARE GIVEN THIS PROXY 
WILL BE VOTED FOR ELECTION OF DIRECTORS AS PROVIDED BY ZENITH'S PROXY 
STATEMENT AND IN ACCORDANCE WITH THE DISCRETION OF THE PROXIES ON SUCH OTHER 
MATTERS AS MAY PROPERLY COME BEFORE THE MEETING.

IN THE EVENT OF CUMULATIVE VOTING IN THE ELECTION OF DIRECTORS, THE PROXIES MAY
DISTRIBUTE THE VOTES REPRESENTED BY THIS PROXY AMONG THE NOMINEES IN SUCH
PROPORTION AS THEY SEE FIT.

      (Continued and to be marked, signed and dated on other side)

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

                          FOLD AND DETACH HERE 

<PAGE>

                                                              Please mark   /X/
                                                              your votes as
                                                              indicated in
                                                              this example


                FOR all nominees listed       WITHHOLD AUTHORITY to vote
                below (except as marked       for all nominees listed below
                to the contrary below)

1. Election of Directors:     /  /                              /  /


George E. Bello, Max M. Kampelman, Jack M. Ostrow, William Steele Sessions, 
Harvey L. Silbert, Robert M. Steinberg, Saul P. Steinberg, Gerald Tsai, Jr. 
and Stanley R. Zax.

(INSTRUCTION: To withhold authority for any individual nominee write that 
nominee's name in the space provided below.)

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2. In their discretion, upon such other matters as may properly come before 
the meeting.

Dated: ________________________,1998

Signature _________________________________

Signature _________________________________


Note Please sign EXACTLY as your name appears herein. When signing as 
attorney, executor, administrator, trustee or guardian, please give your full 
title as such. If executed by a corporation, an authorized officer should 
sign, and the corporate seal should be affixed. A proxy for shares held in 
joint ownership should be signed by each joint owner.

       Please mark, sign and date this Proxy and return it promptly in the 
      accompanying envelope, which requires no postage if mailed in the United 
                                    States.

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                            FOLD AND DETACH HERE


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