MARTIN MARIETTA MATERIALS INC
11-K, 1999-06-30
MINING & QUARRYING OF NONMETALLIC MINERALS (NO FUELS)
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<PAGE>   1

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

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM 11-K

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


          [X]    ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE
                SECURITIES EXCHANGE ACT OF 1934 (NO FEE REQUIRED)

                   For the fiscal year ended December 31, 1998

                                       OR

          [ ]    TRANSITION REPORT PURSUANT TO SECTION 15(d) OF
              THE SECURITIES EXCHANGE ACT OF 1934 (NO FEE REQUIRED)

                      For the transition period from       to

                         Commission file number: 1-12744


                         MARTIN MARIETTA MATERIALS, INC.
                            PERFORMANCE SHARING PLAN
              (Full title of the plan and the address of the plan,
                if different from that of the issuer named below)




                         MARTIN MARIETTA MATERIALS, INC.
                                2710 Wycliff Road
                          Raleigh, North Carolina 27607
   (Name of issuer of the securities held pursuant to the plan and the address
                       of its principal executive office)




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

<PAGE>   2



                          Audited Financial Statements
                         Martin Marietta Materials, Inc.
                            Performance Sharing Plan

                         Martin Marietta Materials, Inc.
                     Defined Contribution Plans Master Trust

                     Years ended December 31, 1998 and 1997
                       with Report of Independent Auditors




<PAGE>   3


                         Martin Marietta Materials, Inc.
                            Performance Sharing Plan

                         Martin Marietta Materials, Inc.
                     Defined Contribution Plans Master Trust

                          Audited Financial Statements

                     Years ended December 31, 1998 and 1997




                                    Contents


Audited Financial Statements for the Plan

Report of Independent Auditors..............................................1
Statements of Net Assets Available for Benefits.............................2
Statements of Changes in Net Assets Available for Benefits..................4
Notes to Financial Statements...............................................6


Audited Financial Statements for the Master Trust

Report of Independent Auditors ............................................11
Statements of Net Assets...................................................13
Statements of Changes in Net Assets and Trust Balance......................15
Notes to Financial Statements..............................................17



<PAGE>   4


                         Report of Independent Auditors


Martin Marietta Materials, Inc., as Plan Administrator

We have audited the accompanying statements of net assets available for benefits
of the Martin Marietta Materials, Inc. Performance Sharing Plan as of December
31, 1998 and 1997, and the related statements of changes in net assets available
for benefits for the years then ended. These financial statements are the
responsibility of Martin Marietta Materials, Inc., as Plan Administrator. Our
responsibility is to express an opinion on these financial statements based on
our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the net assets available for benefits of the Plan at
December 31, 1998 and 1997, and the changes in its net assets available for
benefits for the years then ended, in conformity with generally accepted
accounting principles.

Our audits were performed for the purpose of forming an opinion on the financial
statements taken as a whole. The Fund Information in the statements of net
assets available for benefits and the statements of changes in net assets
available for benefits is presented for purposes of additional analysis rather
than to present the net assets available for benefits and changes in net assets
available for benefits of each fund. The Fund Information has been subjected to
the auditing procedures applied in our audits of the financial statements and,
in our opinion, is fairly stated in all material respects in relation to the
financial statements taken as a whole.

                                                          Ernst & Young LLP

June 11, 1999
Raleigh, North Carolina



<PAGE>   5

                         Martin Marietta Materials, Inc.
                            Performance Sharing Plan

      Statement of Net Assets Available for Benefits, with Fund Information

                                December 31, 1998
                                 (In Thousands)

<TABLE>
<CAPTION>
                            Yield-                Martin
                           Enhanced              Marietta    Lockheed      Harbor                 Investment              Daily
                          Short-Term     S&P     Materials    Martin       Capital   Intermediate Company of  American    Bond
                          Investment  500 Index   Common      Common    Appreciation    Bond       America    Balanced   Market
                             Fund       Fund    Stock Fund  Stock Fund      Fund        Fund        Fund        Fund      Fund
                          --------------------------------------------------------------------------------------------------------
<S>                         <C>         <C>       <C>          <C>         <C>          <C>         <C>         <C>      <C>
Assets
Interest in Master Trust    $27,177     $30,228   $28,217      $    -      $ 8,094      $     -     $    -      $   -    $ 4,100
Contributions receivable:
  Employees                      87         107        81           -           32            -          -          -          9
  Martin Marietta
   Materials,  Inc.              50          26        27           -            9            -          -          -          2
                          --------------------------------------------------------------------------------------------------------
Net assets available for
 benefits                   $27,314     $30,361   $28,325      $    -      $ 8,135      $     -     $    -      $   -    $ 4,111
                          ========================================================================================================


                                       Vanguard
                          Vanguard  International
                           Windsor      Growth        Loan
                            Fund         Fund         Fund      Total
                          ----------------------------------------------
<S>                         <C>        <C>           <C>      <C>
Assets
Interest in Master Trust    $5,462     $   2,229     $1,586   $107,093
Contributions receivable:
  Employees                     42            16          -        374
  Martin Marietta
   Materials,  Inc.             12             4          -        130
                          ----------------------------------------------
Net assets available for
 benefits                   $5,516     $   2,249     $1,586   $107,597
                          ==============================================
</TABLE>

See accompanying notes.

2
<PAGE>   6


                         Martin Marietta Materials, Inc.
                            Performance Sharing Plan

      Statement of Net Assets Available for Benefits, with Fund Information

                                December 31, 1997
                                 (In Thousands)

<TABLE>
<CAPTION>
                 Yield-                   Martin
                Enhanced                 Marietta     Lockheed      Harbor                 Investment                Daily
               Short-Term      S&P      Materials      Martin      Capital   Intermediate  Company of   American      Bond
               Investment   500 Index     Common       Common    Appreciation    Bond       America     Balanced     Market
                  Fund        Fund      Stock Fund   Stock Fund      Fund        Fund         Fund        Fund        Fund
               ------------------------------------------------------------------------------------------------------------
<S>               <C>         <C>         <C>          <C>          <C>         <C>          <C>          <C>       <C>
Assets
Interest in
  Master Trust    $18,155     $22,188     $8,911       $17,074      $ 3,544     $   461      $1,036       $ 559     $1,814
               ============================================================================================================

Net assets
 available for
 benefits         $18,155     $22,188     $8,911       $17,074      $ 3,544     $   461      $1,036       $ 559     $1,814
               ============================================================================================================


                            Vanguard
               Vanguard   International
                Windsor      Growth        Loan
                 Fund         Fund         Fund        Total
               -------------------------------------------------
<S>              <C>         <C>           <C>         <C>
Assets
Interest in
  Master Trust   $5,224      $1,654        $1,582      $82,202
               =================================================

Net assets
 available for
 benefits        $5,224      $1,654        $1,582      $82,202
               =================================================
</TABLE>

See accompanying notes.

3
<PAGE>   7


                         Martin Marietta Materials, Inc.
                            Performance Sharing Plan

           Statement of Changes in Net Assets Available for Benefits,
                              with Fund Information

                          Year ended December 31, 1998
                                 (In Thousands)

<TABLE>
<CAPTION>
                                      Yield-              Martin
                                     Enhanced             Marietta   Lockheed     Harbor
                                    Short Term   S & P    Materials   Martin      Capital   Intermediate Investment   American
                                    Investment 500 Index  Common      Common    Appreciation    Bond      Company of  Balanced
                                       Fund       Fund    Stock Fund  Stock Fund    Fund        Fund     America Fund   Fund
                                    -------------------------------------------------------------------------------------------
<S>                                  <C>        <C>        <C>       <C>         <C>         <C>        <C>           <C>
Net assets available for
   benefits at beginning of
   period                            $ 18,155   $ 22,188   $  8,911  $ 17,074    $  3,544    $    461   $  1,036      $   559
Additions to net assets:
   Contributions:
     Employees                          1,033      1,315      1,032         -         405           -          -            -
     Martin Marietta Materials, Inc.      610        329        363         -         123           -          -            -
     Rollover Contributions               154        614        693         -         663           -          -            -
                                    -------------------------------------------------------------------------------------------
Total contributions                     1,797      2,258      2,088         -       1,191           -          -            -

Interest in net investment gain
   of Master Trust                      1,144      6,513     10,076     1,870       1,838           1          4            1
                                    -------------------------------------------------------------------------------------------
Total additions                         2,941      8,771     12,164     1,870       3,029           1          4            1

Deductions from net assets:
   Distributions and withdrawals        2,076      1,118        478       869         126           -          -            -
   Administrative expenses                 63        116         51        37          17           -          -            -
                                    -------------------------------------------------------------------------------------------
Total deductions                        2,139      1,234        529       906         143           -          -            -

Net transfers between funds             8,357        636      7,779   (18,038)      1,705        (462)    (1,040)        (560)
                                    -------------------------------------------------------------------------------------------
Net assets available for
   benefits at end of year           $ 27,314   $ 30,361   $ 28,325  $     -    $   8,135    $      -   $     -       $     -
                                    ===========================================================================================


                                      Daily              Vanguard
                                      Bond   Vanguard  International
                                     Market  Windsor      Growth    Loan
                                      Fund     Fund        Fund     Fund    Total
                                    ---------------------------------------------
<S>                                  <C>    <C>       <C>        <C>      <C>
Net assets available for
   benefits at beginning of
   period                            $1,814 $  5,224  $  1,654   $1,582   $82,202
Additions to net assets:
   Contributions:
     Employees                          112      516       201        -     4,614
     Martin Marietta Materials, Inc.     33      151        55        -     1,664
     Rollover Contributions             103      342       119        -     2,688
                                    ---------------------------------------------
Total contributions                     248    1,009       375        -     8,966

Interest in net investment gain
   of Master Trust                      187       (8)      255      134    22,015
                                    ---------------------------------------------
Total additions                         435    1,001       630      134    30,981

Deductions from net assets:
   Distributions and withdrawals         67      255        52      221     5,262
   Administrative expenses               18       16         6        -       324
                                    ---------------------------------------------
Total deductions                         85      271        58      221     5,586

Net transfers between funds           1,947     (438)       23       91         -
                                    ---------------------------------------------
Net assets available for
   benefits at end of year           $4,111 $  5,516  $  2,249   $1,586  $107,597
                                    =============================================
</TABLE>

See accompanying notes.

4
<PAGE>   8

                         Martin Marietta Materials, Inc.
                            Performance Sharing Plan

           Statement of Changes in Net Assets Available for Benefits,
                              with Fund Information

                          Year ended December 31, 1997
                                 (In Thousands)

<TABLE>
<CAPTION>
                                      Yield-              Martin
                                     Enhanced            Marietta     Lockheed     Harbor
                                    Short Term  S&P 500  Materials    Martin      Capital   Intermediate Investment  American
                                    Investment  Index     Common      Common    Appreciation   Bond      Company of  Balanced
                                       Fund      Fund   Stock Fund   Stock Fund     Fund       Fund     America Fund   Fund
                                    -------------------------------------------------------------------------------------------
<S>                                  <C>        <C>        <C>       <C>         <C>         <C>        <C>           <C>
Net assets available for
   benefits at beginning of
   period                            $ 20,221   $ 16,576   $  2,020  $ 20,690    $  1,471    $  1,024   $  1,190      $   510
Additions to net assets:
   Contributions:
     Employees                          1,232        996        377         -         166          59        119           79
     Martin Marietta Materials, Inc.      652        208        119         -          40          13         32           20
     Rollover Contributions               217         65         55         -          27           -         12            2
                                    -------------------------------------------------------------------------------------------
Total contributions                     2,101      1,269        551         -         233          72        163          101

Interest in net investment gain
   of Master Trust                      1,063      5,394      1,992     1,941         500          70        377          156
                                    -------------------------------------------------------------------------------------------
Total additions                         3,164      6,663      2,543     1,941         733         142        540          257

Deductions from net assets:
   Distributions and withdrawals        3,128        776         66       660          25          71         35           15
   Administrative expenses                 45         68         13        42           5           6          3            1
                                    -------------------------------------------------------------------------------------------
Total deductions                        3,173        844         79       702          30          77         38           16

Net transfers from other plans              -         21          -       154          19           -         36           16
Net transfers between funds            (2,057)      (228)     4,427    (5,009)      1,351        (628)      (692)        (208)
                                    -------------------------------------------------------------------------------------------
Net assets available for
   benefits at end of year           $ 18,155   $ 22,188   $  8,911  $ 17,074    $  3,544    $    461   $  1,036      $   559
                                    ===========================================================================================



                                     Daily             Vanguard
                                     Bond  Vanguard  International
                                    Market  Windsor     Growth    Loan
                                     Fund    Fund        Fund     Fund    Total
                                    ---------------------------------------------
<S>                                  <C>     <C>      <C>        <C>      <C>
Net assets available for
   benefits at beginning of
   period                            $  645  $ 2,620  $  1,231   $1,241   $69,439
Additions to net assets:
   Contributions:
     Employees                           51      359       134        -     3,572
     Martin Marietta Materials, Inc.     14       87        30        -     1,215
     Rollover Contributions               -       24         4        -       406
                                    ---------------------------------------------
Total contributions                      65      470       168        -     5,193

Interest in net investment gain
   of Master Trust                       83      686        48      116    12,426
                                    ---------------------------------------------
Total additions                         148    1,156       216      116    17,619

Deductions from net assets:
   Distributions and withdrawals         12       47        34       91     4,960
   Administrative expenses                5        8         4        -       200
                                    ---------------------------------------------
Total deductions                         17       55        38       91     5,160

Net transfers from other plans            -       22        36        -       304
Net transfers between funds           1,038    1,481       209      316         -
                                    ---------------------------------------------
Net assets available for
   benefits at end of year           $1,814 $  5,224  $  1,654   $1,582   $82,202
                                    =============================================
</TABLE>


See accompanying notes.


5
<PAGE>   9

                         Martin Marietta Materials, Inc.
                            Performance Sharing Plan

                          Notes to Financial Statements

                                December 31, 1998


1. Accounting Policies

The financial statements of the Martin Marietta Materials, Inc. Performance
Sharing Plan (the "Plan") are prepared on the accrual basis of accounting. No
liability is recorded for distributions to participants who terminated during
the year but have chosen to defer payments to the following year. The assets of
the plan are held and invested on a commingled basis in the Martin Marietta
Materials, Inc. Defined Contribution Plans Master Trust (the "Master Trust")
along with the assets of the Martin Marietta Materials, Inc. Savings and
Investment Plan for Hourly Employees. Prior to January 1, 1998, the Master Trust
also included the assets of the Martin Marietta Materials, Inc. Money
Accumulation Plan for Hourly Employees, which was subsequently merged into the
Martin Marietta Materials, Inc. Savings and Investment Plan for Hourly
Employees. The Plan's interest in the Master Trust is stated at the fair value
of the underlying net assets in the Master Trust. The assets, realized and
unrealized gains and losses and investment income of the Master Trust are
allocated among the participating plans on a pro rata basis. All administrative
expenses, a portion of which are paid by Martin Marietta Materials, Inc. (the
"Corporation"), are otherwise paid by the Master Trust and allocated to each of
the participating plans.

The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates, in particular the
determination of fair values of investments for which market values are not
readily available. Actual results could differ from those estimates.

2. Description of the Plan

The Plan is a defined contribution plan providing eligible salaried employees of
the Corporation an opportunity to participate in an individual savings and
investment program providing tax deferred savings and retirement incentives.
Martin Marietta Materials, Inc. is the Plan's sponsor and also serves as the
Plan administrator.



                                                                               6
<PAGE>   10


                         Martin Marietta Materials, Inc.
                            Performance Sharing Plan

                    Notes to Financial Statements (continued)




2. Description of the Plan (continued)

Employees are eligible to enroll in the Plan after six months of service.
Employee participation requires employee basic contributions of 1% to 7% of base
salary (as defined in the Plan and subject to applicable Internal Revenue Code
("IRC") limitations on allowable compensation). Participants may also elect to
make additional supplemental contributions which are not considered for purposes
of computing the employer match. A participant's combined basic and supplemental
contributions may not exceed 17% of that participant's base pay. Generally, a
participant's before-tax contributions may not exceed 15% of base pay, subject
to certain restrictions for highly compensated employees, as defined.

The Corporation matches the participants' annual basic contribution (the first
7% of base pay). The amount of the Corporation's match is equal to 50% of the
basic contributions and is credited to participant accounts monthly. All
participants are 100% vested in the value of their accounts, including employer
contributions.

During 1998, the participants' investment options included the Yielded-Enhanced
Short-Term Investment Fund, S&P 500 Index Fund, Martin Marietta Materials Common
Stock Fund, Harbor Capital Appreciation Fund, Daily Bond Market Fund, Vanguard
Windsor Fund and Vanguard International Growth Fund. Effective January 1, 1998,
the Intermediate Bond Fund, Investment Company of America Fund and the American
Balanced Fund investment options were eliminated.

The Lockheed Martin Common Stock Fund was an investment option prior to the
Corporation's split-off from Lockheed Martin Corporation, the Corporation's
former parent company and the previous administrator of the Plan. In October
1998, any participant's remaining balance in the Lockheed Martin Common Stock
Fund was automatically reinvested in the Yield-Enhanced Short-Term Investment
Fund.



                                                                               7
<PAGE>   11


                         Martin Marietta Materials, Inc.
                            Performance Sharing Plan

                    Notes to Financial Statements (continued)




2. Description of the Plan (continued)

Participants may change the overall percentage of their contributions in 1%
increments and may change investment elections for future before-tax, after-tax
and matching contributions, both up to once per month. Any changes in investment
elections must be made in 5% increments. In addition, participants may change
the investment mix of the accumulated value of prior contributions among the
investment options - daily, but are limited to 12 changes in a calendar year,
provided that the participant has one transfer in a calendar quarter, regardless
of the limitation. The Plan provides for participants to borrow from the money
in his or her own investment account. All loans must meet specific terms and
conditions of the Plan and are subject to applicable IRC regulations. Personal
loans are available to participants in terms of up to 5 years, and primary
residence loans are available for terms of up to 15 years. Such loans bear
interest at a fixed rate, established upon loan request, which is equal to the
annual prime rate (based upon corporate borrowing rates posted by at least 75%
of the nation's 30 largest banks, as reported in The Wall Street Journal on the
first business day of the calendar month before loan application) plus 1%. All
loans are due in full immediately upon termination of employment. Approximately
$708,000 and $936,000 was loaned to participants during 1998 and 1997,
respectively. Outstanding loan balances and loan-related activities are
reflected in the Loan Fund account in the accompanying financial statements. In
addition, the plan provides for in-service withdrawals to participants that meet
specific conditions of financial hardship, as defined in the Plan and in
accordance with current specific regulations under the IRC. Participants who are
still working at the age of 59 1/2 may qualify for special withdrawal rights and
privileges as defined in the Plan.

Upon separation from the Corporation, participants may receive the full current
value of their contributions and the matching employer contributions.
Participants who have attained age 55 may receive their distributions in the
form of a lump-sum payment or in annual installments over a period of up to 25
years. The accounts of participants who receive installment payments remain
invested in the funds indicated by the participant.

State Street Bank and Trust Company is the trustee of the Master Trust and
recordkeeper of the Master Trust and Plan.

Although the Corporation expects to continue the Plan indefinitely, the Board of
Directors of the Corporation may terminate the Plan for any reason at any time.
If the Plan is terminated, each participant or former participant shall receive
a payment equal to the value of the participant's account.


                                                                               8
<PAGE>   12


                         Martin Marietta Materials, Inc.
                            Performance Sharing Plan

                    Notes to Financial Statements (continued)




3. Income Tax Status

The Internal Revenue Service ruled on March 18, 1998 that the Plan qualifies
under Section 401(a) of the Internal Revenue Code (IRC) and therefore, the Plan
is not subject to tax under present tax laws. The Plan has been amended since
the date the determination letter is applicable for and as such, the plan
administrator has filed for a new determination letter. The Plan is required to
operate in conformity with the IRC to maintain its qualification. The plan
administrator is not aware of any course of action or series of events that have
occurred that might adversely affect the Plan's qualified status.

4. Master Trust

The Plan's interest in the Master Trust's net assets as of December 31, 1998 and
1997, was 84.95% and 86.55%, respectively. The Plan's interest in the Master
Trust did not fluctuate significantly throughout the years ended December 31,
1998 and 1997. An analysis of investments for the Master Trust is as follows:

<TABLE>
<CAPTION>
                                                                     1998
                                           ----------------------------------------------------------
                                                               Net Appreciation
                                               Interest         in Fair Value        Fair Value at
                                             and Dividends       During Year          End of Year
                                           ----------------------------------------------------------
<S>                                          <C>                <C>                 <C>
                                                                (In Thousands)
Investments at fair value as determined by
quoted market price:
   Cash and cash equivalents                 $       1,493      $           -       $      35,527
   Governmental bonds                                  126                  -               2,465
   Corporate bonds                                      64                  -               1,763
   Common stocks                                     1,506             21,784              83,784
   Other                                               150                  -               2,211
                                           ----------------------------------------------------------
                                             $       3,339      $      21,784       $     125,750
                                           ==========================================================
</TABLE>


                                                                               9
<PAGE>   13


                         Martin Marietta Materials, Inc.
                            Performance Sharing Plan

                    Notes to Financial Statements (continued)




4. Master Trust (continued)

<TABLE>
<CAPTION>
                                                                     1997
                                           ----------------------------------------------------------
                                                               Net Appreciation
                                               Interest         in Fair Value        Fair Value at
                                             and Dividends       During Year          End of Year
                                           ----------------------------------------------------------
<S>                                          <C>                <C>                 <C>
                                                                (In Thousands)
Investments at fair value as determined by
quoted market price:
   Cash and cash equivalents                 $       1,397      $           -       $      25,197
   Governmental bonds                                   17                104               1,564
   Corporate bonds                                      11                 70                 905
   Common stocks                                     2,022              9,998              65,319
   Other                                                 -                116               1,582
                                           ----------------------------------------------------------
                                             $       3,447      $      10,288       $      94,567
                                           ==========================================================
</TABLE>

The following audited financial statements of the Master Trust contain
additional information concerning the Plan's interest in the Master Trust.

5. Year 2000 Issue (unaudited)

The Corporation has established a dedicated information technology task force to
coordinate the identification, evaluation and implementation of modifications
and replacements to the Corporation's information systems and related
applications necessary to achieve a year 2000 date conversion with no effect on
customers or disruption to its business operations. The Corporation's goal is to
be substantially year 2000 compliant on a timely basis. The major systems and
applications carrying potential business impact have been identified, evaluated,
and converted. In addition, the Corporation is communicating with suppliers,
customers, financial institutions and others with which it does business to
coordinate the year 2000 conversion process. The cost of the year 2000
initiatives is not expected to be material to the Corporation's results of
operations or financial position or to the Plan's operations.




                                                                              10
<PAGE>   14



                         Report of Independent Auditors

Martin Marietta Materials, Inc., as Trust Administrator

We have audited the accompanying statements of net assets of the Martin Marietta
Materials, Inc. Defined Contribution Plans Master Trust as of December 31, 1998
and 1997 and the related statements of changes in net assets and trust balance
for the years then ended. These financial statements are the responsibility of
the Trust's management. Our responsibility is to express an opinion on these
financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the net assets of the Master Trust at December 31, 1998
and 1997, and the changes in its net assets and trust balance for the years then
ended, in conformity with generally accepted accounting principles.

The accompanying statements are those of the Martin Marietta Materials, Inc.
Defined Contribution Plans Master Trust, which is established under the Martin
Marietta Materials, Inc. Performance Sharing Plan and the Martin Marietta
Materials, Inc. Savings and Investment Plan for Hourly Employees (collectively,
the "Plans"). The Master Trust also included the Martin Marietta Materials, Inc.
Money Accumulation Plan for Hourly Employees for the year ended December 31,
1997. The statements do not purport to represent the net assets available for
benefits at December 31, 1998 and 1997 or the changes in net assets available
for benefits for the years then ended of the Plans. Furthermore, these
statements do not purport to satisfy the Department of Labor's Rules and
Regulations for Reporting and Disclosure under the Employee Retirement Income
Security Act of 1974 relating to the financial statements of employee benefit
plans.


                                                                              11
<PAGE>   15



Our audits were performed for the purpose of forming an opinion on the financial
statements taken as a whole. The Fund Information in the statements of net
assets and the statements of changes in net assets and trust balance is
presented for purposes of additional analysis rather than to present the net
assets and changes in net assets and trust balance of each fund. The Fund
Information has been subjected to the auditing procedures applied in our audits
of the financial statements and, in our opinion, is fairly stated in all
material respects in relation to the financial statements taken as a whole.

                                                         Ernst & Young LLP

June 11, 1999
Raleigh, North Carolina


                                                                              12
<PAGE>   16


                         Martin Marietta Materials, Inc.
                     Defined Contribution Plans Master Trust
                 Statement of Net Assets, with Fund Information
                                December 31, 1998
                                 (In Thousands)


<TABLE>
<CAPTION>
                           Yield-                 Martin
                          Enhanced               Marietta    Lockheed      Harbor                 Investment             Daily
                         Short-Term     S&P      Materials    Martin       Capital   Intermediate Company    American    Bond
                         Investment  500 Index    Common      Common    Appreciation    Bond      of America Balanced   Market
                            Fund       Fund     Stock Fund  Stock Fund      Fund        Fund       Fund        Fund      Fund
                         --------------------------------------------------------------------------------------------------------
<S>                         <C>       <C>         <C>         <C>        <C>          <C>        <C>        <C>         <C>
Assets
Investments at quoted
  fair value:
  Cash and cash equivalents $34,302   $     -    $ 1,225      $ -        $    -       $ -        $ -        $    -      $    -
  Governmental bonds              -         -          -        -             -         -          -             -       2,465
  Corporate bonds                 -         -          -        -             -         -          -             -       1,763
  Common stocks                   -    34,875     31,864        -         8,721         -          -             -           -
                         --------------------------------------------------------------------------------------------------------
Total investments at
  quoted fair value          34,302    34,875     33,089        -         8,721         -                                4,228


Investments at estimated
  fair value:
  Participant loans               -         -          -        -             -         -          -             -           -
                         --------------------------------------------------------------------------------------------------------
Total investments at
estimated fair value              -         -          -        -             -         -          -             -           -

Other assets:
  Dividends and interest
    receivable                  149         -          4        -             -         -          -             -           -
  Other                         262       146        111        -            33         -          -             -           3
                         --------------------------------------------------------------------------------------------------------
Total other assets              411       146        115        -            33         -          -             -           3
                         --------------------------------------------------------------------------------------------------------
Total assets                 34,713    35,021     33,204        -         8,754         -          -             -       4,231

Liabilities
Amounts payable for
  investments
  purchased                       -         -        426        -             -         -          -             -           -
                         --------------------------------------------------------------------------------------------------------
Total liabilities                 -         -        426        -             -         -          -             -           -
                         --------------------------------------------------------------------------------------------------------

Net assets                  $34,713   $35,021    $32,778      $ -       $ 8,754       $ -       $  -         $  -       $4,231
                         ========================================================================================================


                                      Vanguard
                           Vanguard  International
                            Windsor    Growth       Loan
                             Fund       Fund        Fund      Total
                         --------------------------------------------
Assets
Investments at quoted
  fair value:
  Cash and cash equivalents $     -   $     -    $     -      $ 35,527
  Governmental bonds              -         -          -         2,465
  Corporate bonds                 -         -          -         1,763
  Common stocks               5,921     2,403          -        83,784
                         -----------------------------------------------
Total investments at
  quoted fair value           5,921     2,403          -       123,539


Investments at estimated
  fair value:
  Participant loans               -         -      2,211         2,211
                         -----------------------------------------------
Total investments at
estimated fair value              -         -      2,211         2,211

Other assets:
  Dividends and interest
    receivable                    -         -          -           153
  Other                          29        11          -           595
                         -----------------------------------------------
Total other assets               29        11          -           748
                         -----------------------------------------------
Total assets                  5,950     2,414      2,211       126,498

Liabilities
Amounts payable for
  investments
  purchased                       -         -          -           426
                         -----------------------------------------------
Total liabilities                 -         -          -           426
                         -----------------------------------------------

Net assets                  $ 5,950   $ 2,414    $ 2,211      $126,072
                         ===============================================
</TABLE>


See accompanying notes.


13
<PAGE>   17


                         Martin Marietta Materials, Inc.
                     Defined Contribution Plans Master Trust
                 Statement of Net Assets, with Fund Information
                                December 31, 1997
                                 (In Thousands)

<TABLE>
<CAPTION>
                                         Yield-              Martin
                                        Enhanced            Marietta  Lockheed
                                         Short-      S&P    Materials  Martin     Harbor                 Investment
                                          Term       500    Common     Common     Capital                Company of American
                                        Investment  Index     Stock     Stock  Appreciation  Intermediate  America  Balanced
                                          Fund      Fund      Fund      Fund       Fund      Bond Fund     Fund       Fund
                                        --------------------------------------------------------------------------------------
<S>                                     <C>       <C>       <C>         <C>      <C>         <C>          <C>        <C>
Assets
 Investments at quoted fair value:
     Cash and Cash Equivalents          $24,246   $     -   $   442     $ 439    $    -      $    -       $    -     $ 70
     Governmental Bonds                       -         -         -         -         -         232            -      104
     Corporate Bonds                          -         -         -         -         -         231            -       69
     Common Stocks                            -    24,734     9,344    19,356     3,565           -        1,048      336
                                        --------------------------------------------------------------------------------------
Total investments at quoted fair value   24,246    24,734     9,786    19,795     3,565         463        1,048      579

Investments at estimated fair value:
  Participant loans                           -         -         -         -         -           -            -        -
                                        --------------------------------------------------------------------------------------
Total investments at estimated fair
value                                         -         -         -         -         -           -            -        -

Other assets:
 Contributions receivable:
   Employees                                204       124        41         -        14           5           10        7
   Martin Marietta Materials, Inc.           71        19         9         -         3           1            3        2
 Dividends and interest receivable          116         -         2         1         -           -            -        -
                                        --------------------------------------------------------------------------------------
Total other assets                          391       143        52         1        17           6           13        9
                                        --------------------------------------------------------------------------------------
Total assets                             24,637    24,877     9,838    19,796     3,582         469        1,061      588

Liabilities
 Administrative expenses payable             44        52        11        30         3           3            3        1
 Amounts payable for investments
  purchased                                   -         -       121         -         -           -            -        -
                                        --------------------------------------------------------------------------------------
Total liabilities                            44        52       132        30         3           3            3        1
                                        --------------------------------------------------------------------------------------
Net assets                              $24,593   24,825    $9,706  $19,766    $3,579       $ 466       $1,058    $ 587
                                        ======================================================================================
</TABLE>


<TABLE>
<CAPTION>
                                            Daily               Vanguard
                                            Bond    Vanguard  International
                                           Market   Windsor      Growth      Loan
                                            Fund     Fund        Fund        Fund       Total
                                        --------------------------------------------------------
<S>                                       <C>         <C>      <C>         <C>        <C>
Assets
 Investments at quoted fair value:
     Cash and Cash Equivalents            $    -      $   -    $    -      $    -     $25,197
     Governmental Bonds                    1,228          -         -           -       1,564
     Corporate Bonds                         605          -         -           -         905
     Common Stocks                             -      5,247     1,689           -      65,319
                                        --------------------------------------------------------
Total investments at quoted fair value     1,833      5,247     1,689           -      92,985

Investments at estimated fair value:
  Participant loans                            -          -         -       1,582       1,582
                                        --------------------------------------------------------
Total investments at estimated fair
value                                          -          -         -       1,582       1,582

Other assets:
 Contributions receivable:
   Employees                                   5         31        11           -         452
   Martin Marietta Materials, Inc.             1          8         3           -         120
 Dividends and interest receivable             -          -         -           -         119
                                        --------------------------------------------------------
Total other assets                             6         39        14           -         691
                                        --------------------------------------------------------
Total assets                               1,839      5,286     1,703       1,582      95,258

Liabilities
 Administrative expenses payable               4          7         4           -         162
 Amounts payable for investments
  purchased                                    -          -         -           -         121
                                        --------------------------------------------------------
Total liabilities                              4          7         4           -         283
                                        --------------------------------------------------------
Net assets                                $1,835     $5,279    $1,699      $1,582     $94,975
                                        ========================================================
</TABLE>

14
<PAGE>   18


                         Martin Marietta Materials, Inc.
                     Defined Contribution Plans Master Trust
   Statement of Changes in Net Assets and Trust Balance, with Fund Information
                          Year ended December 31, 1998
                                 (In Thousands)

<TABLE>
<CAPTION>
                                          Yield-            Martin
                                         Enhanced          Marietta  Lockheed
                                          Short-    S&P    Materials  Martin      Harbor                 Investment
                                           Term     500     Common    Common     Capital                 Company of American
                                        Investment Index    Stock      Stock   Appreciation Intermediate   America  Balanced
                                           Fund     Fund     Fund      Fund       Fund       Bond Fund     Fund       Fund
                                        -------------------------------------------------------------------------------------
<S>                                     <C>       <C>       <C>        <C>      <C>          <C>         <C>       <C>

Net assets at beginning
 of period:                             $24,593   $24,825   $ 9,706    $19,766  $ 3,579      $  466      $ 1,058   $  587
Additions to net assets:
   Contributions:
     Employees                            1,958     2,137     1,863         -       525           -            -        -
     Employer                               824       476       518         -       147           -            -        -
     Rollover contributions                 174       696       834         -       741           -            -        -
                                        -------------------------------------------------------------------------------------
Total Contributions                       2,956     3,309     3,215         -     1,413           -            -        -


Investment Income:
 Dividends and interest                   1,493         -       237       196       509           -            -        -
 Net realized and unrealized gain (loss)      -     7,448    11,248     1,953     1,436           1            4        1
                                        -------------------------------------------------------------------------------------
Total investment income                   1,493     7,448    11,485     2,149     1,945           1            4        1
                                        -------------------------------------------------------------------------------------
Total additions                           4,449    10,757    14,700     2,149     3,358           1            4        1


Deductions from net assets:
 Distributions and withdrawals            2,874     1,272       535     1,010       137           -            -        -
 Administrative expenses                     84       133        58        44        18           -            -        -
                                        -------------------------------------------------------------------------------------
Total deductions                          2,958     1,405       593     1,054       155           -            -        -
Net transfers from other plans             (107)       48         -         -         -           -            -        -
Net transfers between funds               8,736       796     8,965   (20,861)    1,972        (467)      (1,062)    (588)
                                        -------------------------------------------------------------------------------------
Net assets at end of year               $34,713   $35,021   $32,778   $     -   $ 8,754      $    -       $    -    $   -
                                        =====================================================================================


                                            Daily               Vanguard
                                            Bond    Vanguard  International
                                           Market    Windsor     Growth     Loan
                                            Fund      Fund        Fund      Fund     Total
                                        --------------------------------------------------------
<S>                                      <C>        <C>        <C>         <C>       <C>

Net assets at beginning
 of period:                              $ 1,835    $ 5,279   $ 1,699     $ 1,582    $ 94,975
Additions to net assets:
   Contributions:
     Employees                               163        697       261           -       7,604
     Employer                                 43        186        68           -       2,262
     Rollover contributions                  109        358       140           -       3,052
                                        --------------------------------------------------------
Total Contributions                          315      1,241       469           -      12,918


Investment Income:
 Dividends and interest                      190        515        49         150       3,339
 Net realized and unrealized gain (loss)       -       (526)      219           -      21,784
                                        --------------------------------------------------------
Total investment income                      190        (11)      268         150      25,123
                                        --------------------------------------------------------
Total additions                              505      1,230       737         150      38,041


Deductions from net assets:
 Distributions and withdrawals                70        267        54         265       6,484
 Administrative expenses                      18         17         6           -         378
                                        --------------------------------------------------------
Total deductions                              88        284        60         265       6,862
Net transfers from other plans                 -          -       (23)         -          (82)
Net transfers between funds                1,979       (275)       61         744           -
                                        --------------------------------------------------------
Net assets at end of year                $ 4,231    $ 5,950   $ 2,414     $ 2,211    $126,072
                                        ========================================================
</TABLE>

15
<PAGE>   19

                         Martin Marietta Materials, Inc.
                     Defined Contribution Plans Master Trust
   Statement of Changes in Net Assets and Trust Balance, with Fund Information
                          Year ended December 31, 1997
                                 (In Thousands)

<TABLE>
<CAPTION>
                                          Yield-            Martin
                                         Enhanced           Marietta  Lockheed
                                          Short-     S&P    Materials  Martin     Harbor                Investment
                                           Term      500    Common     Common    Capital                Company of American
                                        Investment  Index   Stock      Stock   Appreciation Intermediate  America  Balanced
                                           Fund     Fund     Fund      Fund       Fund      Bond Fund     Fund       Fund
                                        -------------------------------------------------------------------------------------
<S>                                     <C>       <C>       <C>       <C>       <C>         <C>          <C>       <C>
Net assets at beginning
 of period:                             $25,814   $18,082   $ 2,149   $23,555   $ 1,478     $ 1,025      $ 1,199   $  547
Additions to net assets:
   Contributions:
     Employees                            2,410     1,490       516         -       169          60          124       83
     Employer                               832       228       119         -        41          13           33       21
     Rollover contributions                 229        80        57         -        27           -           12        2
                                        -------------------------------------------------------------------------------------
Total Contributions                       3,471     1,798       692         -       237          73          169      106


Investment Income:
 Dividends and interest                   1,386         -       106       371       482           -          132       92
 Net realized and unrealized gain (loss)      -     5,956     2,023     1,839        20          70          250       71
                                        -------------------------------------------------------------------------------------
Total investment income                   1,386     5,956     2,129     2,210       502          70          382      163
                                        -------------------------------------------------------------------------------------
Total additions                           4,857     7,754     2,821     2,210       739         143          551      269

Deductions from net assets:
 Distributions and withdrawals            3,633       866        72       832        25          71           35       15
 Administrative expenses                     59        75        14        48         4           6            3        1
                                        -------------------------------------------------------------------------------------
Total deductions                          3,692       941        86       880        29          77           38       16
Net transfers from other plans                -        21         -       154        19           -           36       16
Net transfers between funds              (2,386)      (91)    4,822    (5,273)    1,372        (625)        (690)    (229)
                                        -------------------------------------------------------------------------------------
Net assets at end of year               $24,593   $24,825   $ 9,706   $19,766   $ 3,579      $  466      $ 1,058   $  587
                                        =====================================================================================


                                           Daily               Vanguard
                                           Bond    Vanguard  International
                                          Market   Windsor      Growth      Loan
                                           Fund     Fund         Fund       Fund       Total
                                        --------------------------------------------------------
<S>                                       <C>      <C>        <C>         <C>         <C>
Net assets at beginning
 of period:                               $  645   $ 2,639    $ 1,249     $ 1,241     $79,623
Additions to net assets:
   Contributions:
     Employees                                53       372        138           -       5,415
     Employer                                 15        92         32           -       1,426
     Rollover contributions                    -        24          4           -         435
                                        --------------------------------------------------------
Total Contributions                           68       488        174           -       7,276


Investment Income:
 Dividends and interest                        -        805        73           -       3,447
 Net realized and unrealized gain (loss)      83       (113)      (27)        116      10,288
                                        --------------------------------------------------------
Total investment income                       83        692        46         116      13,735
                                        --------------------------------------------------------
Total additions                              151      1,180       220         116      21,011

Deductions from net assets:
 Distributions and withdrawals                12        48         35          91       5,735
 Administrative expenses                       5         9          4           -         228
                                        --------------------------------------------------------
Total deductions                              17        57         39          91       5,963
Net transfers from other plans                 -        22         36           -         304
Net transfers between funds                1,056     1,495        233         316           -
                                        --------------------------------------------------------
Net assets at end of year                $ 1,835   $ 5,279    $ 1,699     $ 1,582     $94,975
                                        ========================================================
</TABLE>

See accompanying notes.

16
<PAGE>   20

                         Martin Marietta Materials, Inc.
                     Defined Contribution Plans Master Trust

                          Notes to Financial Statements

                                December 31, 1998


1. Accounting Policies

The Martin Marietta Materials, Inc. Defined Contribution Plans Master Trust (the
"Master Trust") was created on October 18, 1996, to hold the investments of the
Martin Marietta Materials, Inc. Performance Sharing Plan and the Martin Marietta
Materials, Inc. Savings and Investment Plan for Hourly Employees (collectively,
the "Plans") on a commingled basis. Prior to January 1, 1998, the Master Trust
also included the assets of the Martin Marietta Materials, Inc. Money
Accumulation Plan for Hourly Employees, which was subsequently merged into the
Martin Marietta Materials, Inc. Savings and Investment Plan for Hourly
Employees. All plans are defined contribution plans of Martin Marietta
Materials, Inc. (the "Corporation"). State Street Bank and Trust Company ("State
Street") is the trustee and record keeper for the Master Trust. Each plan owns
the following share of the entire Master Trust:

<TABLE>
<CAPTION>
                                                                                        Interest in Master
                                                                                           Trust as of
                                                                                           December 31,
                                                                            Plan
Name of Plan                                                               Number         1998         1997
- ------------                                                            ---------------------------------------
<S>                                                                         <C>         <C>           <C>

Martin Marietta Materials, Inc. Performance Sharing Plan
EIN #56-1848578                                                             005         84.95%        86.55%

Martin Marietta Materials,  Inc. Savings and Investment
   Plan for Hourly Employees
EIN #56-1848578                                                             006         15.05%        10.98%

Martin Marietta Money Accumulation Plan for Hourly Employees
EIN #56-1848578                                                             007             -          2.47%
                                                                                     --------------------------
                                                                                         100 %         100%
                                                                                     ==========================
</TABLE>

The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates, in particular the
determination of fair values of investments for which market values are not
readily available. Actual results could differ from those estimates.


                                                                              17
<PAGE>   21



                         Martin Marietta Materials, Inc.
                     Defined Contribution Plans Master Trust

                    Notes to Financial Statements (continued)




2. Description of the Master Trust

Plan assets held by the Master Trust are invested in seven funds at December 31,
1998. The Yield-Enhanced Short-Term Investment Fund, which is managed by the
trustee, is invested in high-quality money market instruments, corporate equity
and debt instruments and U.S. Government secured notes and bonds. The S&P 500
Index Fund, which is managed by the trustee, invests in the same individual
common stocks in identical proportions to the S&P 500 index. The Martin Marietta
Materials Common Stock Fund is composed of the Corporation's common stock. The
Harbor Capital Appreciation Fund is designed to seek long-term growth of capital
by investing in stocks of domestic and foreign companies with high equity
capitalization with above average prospects for growth. The Daily Bond Market
Fund, which is managed by the trustee, invests primarily in U.S. Treasury,
Agency, corporate, mortgage backed and asset backed securities. The Vanguard
Windsor Fund is a capital growth and income fund that will invest primarily in a
diversified portfolio of U.S. common stocks thought to be undervalued. The
Vanguard International Growth Fund is designed to achieve long-term growth of
capital by investing in equity securities of non-U.S. Companies. Effective
January 1, 1998, the following investment options were eliminated: Intermediate
Bond Fund, Investment Company of America and American Balanced Fund.

Following the creation of the Master Trust, the Plans' participants were no
longer able to make any participant-directed contributions into the Lockheed
Martin Common Stock Fund nor add to an existing balance in the Lockheed Martin
Common Stock Fund by purchasing additional shares of the underlying common
stock. For the period through October 31, 1998, the Plans' participants were
permitted to transfer out any balance in the Lockheed Martin Common Stock Fund
and any such balance was available for withdrawals, as permitted under the
Plans. At the end of this period, participation in the Lockheed Martin Common
Stock Fund was terminated and any participant's remaining balances were
liquidated and reinvested automatically in the Yield-Enhanced Short-Term
Investment Fund.


                                                                              18
<PAGE>   22


                         Martin Marietta Materials, Inc.
                     Defined Contribution Plans Master Trust

                    Notes to Financial Statements (continued)




2. Description of the Master Trust (continued)

The Plans have loan programs whereby eligible participants may borrow up to the
lesser of 50% of their total account balance less the highest outstanding loan
balance from the past twelve months, or $50,000 with a minimum loan of $500.
Loans are repaid monthly over a term of up to 5 years for personal loans and up
to 15 years for a residential loan at an interest rate of one percent over the
prime rate reported by at least 75% of the nation's 30 largest banks as reported
in The Wall Street Journal on the first business day of the month before loan
application. All loans are due in full immediately upon termination of
employment. Approximately $2,211,000 and $1,582,000 was loaned to participants
at December 31, 1998 and December 31, 1997, respectively. Participant loan
activity and the net outstanding loan balances are reflected in the Loan Fund in
the accompanying financial statements.

Fair values of the underlying securities in the Yield-Enhanced Short-Term
Investment Fund, the S&P 500 Index Fund and the Daily Bond Market Fund are
determined by closing prices on the last business day of the year for those
securities traded on national exchanges, at the most recent sales prices for
those securities traded in over-the-counter markets and at fair value as
determined by the Trustee for securities for which there is not an established
market. The fair value of Martin Marietta Materials common stock is determined
by the closing price per share on the last business day of the year as reported
for New York Stock Exchange Composite Transactions. Fair values of the Harbor
Capital Appreciation Fund, the Vanguard Windsor Fund, and the Vanguard
International Growth Fund are determined by the closing prices on the last
business day of the year.

Administrative expenses, a portion of which are paid by the Corporation, are
otherwise paid from the Trust and allocated to the Plans on a pro rata basis.



                                                                        19
<PAGE>   23


                         Martin Marietta Materials, Inc.
                     Defined Contribution Plans Master Trust

                    Notes to Financial Statements (continued)




3. Investments

The fair values of individual investments that represent 5% or more of the
Master Trust's net assets at December 31, 1998, are as follows:

                                                            (In Thousands)
       Yield-Enhanced Short-Term Investment Fund              $   34,302
       S&P 500 Index Fund                                         34,875
       Martin Marietta Materials Common Stock Fund                33,089
       Harbor Capital Appreciation Fund                            8,721

4. Income Taxes

The Master Trust was created and is used as a funding vehicle to provide
benefits under the various defined contribution plans of the Corporation which
are listed as participating plans in the Master Trust agreement. Only plans
which are qualified under Section 401(a) of the Internal Revenue Code ("IRC")
may be funded through the Master Trust. The plans currently participating in the
Master Trust have applied for determination letters from the Internal Revenue
Service to verify that they are qualified under Section 401(a) of the IRC. As
management believes the plans to be operating in compliance with all applicable
requirements, there has been no provision for federal income taxes in the
financial statements.

5. Year 2000 Issue (unaudited)

The Corporation has established a dedicated information technology task force to
coordinate the identification, evaluation, and implementation of modifications
and replacements to the Corporation's information systems and related
applications necessary to achieve a year 2000 date conversion with no effect on
customers or disruption to its business operations. The Corporation's goal is to
be substantially year 2000 compliant on a timely basis. The major systems and
applications carrying potential business impact have been identified, evaluated,
and converted. In addition, the Corporation is communicating with suppliers,
customers, financial institutions, and others with which it does business to
coordinate the year 2000 conversion process. The cost of the year 2000
initiatives is not expected to be material to the Corporation's results of
operations or financial position or to the Plans' operations.



                                                                              20
<PAGE>   24



                                   SIGNATURES

         The Plan. Pursuant to the requirements of the Securities Exchange Act
of 1934, the trustee of the below named plan has duly caused this annual report
to be signed on its behalf by the undersigned hereunto duly authorized.


                                            MARTIN MARIETTA MATERIALS, INC.
                                            PERFORMANCE SHARING PLAN


                                            By:  Martin Marietta Materials, Inc.
                                                 Plan Administrator

                                            By:  Benefit Plan Committee


                                                 By: /s/ Janice K. Henry
                                                    ----------------------------
                                                         Janice K. Henry


Date:  June 30, 1999



<PAGE>   25


                                  EXHIBIT INDEX


                  Exhibit No.                      Document
                  -----------                      --------
                       23                          Consent of Ernst & Young LLP


<PAGE>   1
                                                                      EXHIBIT 23


               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


We consent to the incorporation by reference in the Registration Statement (Form
S-8 No. 33-83516) pertaining to the Martin Marietta Materials, Inc. Amended
Omnibus Securities Award Plan, as amended; in the Registration Statement (Form
S-8 No. 333-15429) pertaining to the Martin Marietta Materials, Inc. Common
Stock Purchase Plan for Directors, Martin Marietta Materials, Inc. Performance
Sharing Plan and the Martin Marietta Materials, Inc. Savings and Investment Plan
for Hourly Employees; in the Registration Statement (Form S-3 No. 33-99082)
pertaining to the Martin Marietta Materials, Inc. shelf registration; and in the
Registration Statement (Form S-8 No. 333-79039) pertaining to the Martin
Marietta Materials, Inc. Stock-Based Award Plan of our report dated June 11,
1999, with respect to the financial statements of the Martin Marietta Materials,
Inc. Performance Sharing Plan and Martin Marietta Materials, Inc. Defined
Contribution Plans Master Trust included in this Annual Report (Form 11-K) for
the year ended December 31, 1998.

                                                           Ernst & Young LLP

June 25, 1999


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