USG CORP
11-K, 1999-03-31
CONCRETE, GYPSUM & PLASTER PRODUCTS
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                SECURITIES AND EXCHANGE COMMISSION


                     Washington, D.C.  20549



                            FORM 11-K

                          ANNUAL REPORT


                Pursuant to Section 15(d) of the
                 Securities Exchange Act of 1934


(Mark one)


  X    Annual Report pursuant to 15(d) of the Securities Exchange
- -----  Act of 1934 (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 1-8864.

   A.  Full title of the Plan:

               USG CORPORATION INVESTMENT PLAN (Formerly USG
               CORPORATION INVESTMENT PLAN FOR SALARIED EMPLOYEES)


   B. Name of the issuer of the  securities  held  pursuant  to the plan and the
address of its principal executive office:

               USG CORPORATION, 125 SOUTH FRANKLIN STREET, CHICAGO,
               ILLINOIS 60606

<PAGE>

                              REQUIRED INFORMATION


Financial Statements:
- ---------------------

     Plan financial statements and schedules are prepared in accordance with the
financial reporting  requirements of ERISA and are attached hereto,  including a
Consent of Independent Public Auditors with respect to Form S-8 for 1998.


Pursuant to the  requirements  of the  Securities  and Exchange Act of 1934, the
members of the Pension and Investment Committee administering the Plan have duly
caused  this  annual  report  to be  signed by the  undersigned  thereunto  duly
authorized.


                              USG CORPORATION INVESTMENT PLAN



                              By: /s/ Harold E. Pendexter, Jr.
                              --------------------------------
                              H. E. Pendexter, Jr.,
                              Member of Pension and Investment
                              Committee


Date: March 17, 1999
<PAGE>


                                 USG CORPORATION
                                 INVESTMENT PLAN


                                REPORT ON AUDITED
                            FINANCIAL STATEMENTS AND
                             SUPPLEMENTAL SCHEDULES


                     YEARS ENDED DECEMBER 31, 1998 AND 1997



<TABLE>
                                TABLE OF CONTENTS
<CAPTION>

                                                              PAGE
                                                              ----
  <S>                                                           <C>   

  INDEPENDENT AUDITORS' REPORT                                  1

  FINANCIAL STATEMENTS:

     Statements of Net Assets Available
       for Benefits                                             2

     Statements of Changes in Net Assets
       Available for Benefits                                   4

     Notes to Financial Statements                              6


  SUPPLEMENTAL SCHEDULES:

      I.  Schedule of Investments Held
            at Year End                                         13

     II.  Schedule of Reportable Transactions                   14
</TABLE>
<PAGE>

MEMBER OF THE                                              MEMBER OF THE
ILLINOIS CPA                                               AMERICAN INSTITUTE
SOCIETY                                                    OF CERTIFIED
                                                           PUBLIC ACCOUNTANTS
                                             

                                Hill, Taylor LLC
                          CERTIFIED PUBLIC ACCOUNTANTS
                     116 South Michigan Avenue - 11th Floor
                             Chicago, Illinois 60603
                                  312-332-4964
                                Fax: 312-332-0181

                          INDEPENDENT AUDITORS' REPORT

PENSION AND INVESTMENT COMMITTEE
USG CORPORATION

We have audited the accompanying statements of net assets available for
benefits of the USG Corporation Investment 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 the Plan'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 available for benefits
of the Plan as of December 31, 1998 and 1997, and the changes in 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
basic financial statements taken as a whole.  The supplemental schedules
of investments held at year end as of December 31, 1998, and reportable
transactions for the year ended December 31, 1998, are presented for
purpose of additional analysis and are not a required part of the basic
financial statements but are supplementary information required by the
Department of Labor's Rules and Regulations for Reporting and Disclosure
under the Employee Retirement Income Security Act of 1974.  These
supplemental schedules are the responsibility of the Plans management.
The supplemental schedules have been subjected to the auditing procedures
applied in the audits of the basic financial statements and, in our
opinion, are fairly stated in all material respects in relation to the
basic financial statements taken as a whole.


/s/ Hill, Taylor LLC
- --------------------


March 17, 1999
<PAGE>
<TABLE>                                                        USG CORPORATION INVESTMENT PLAN                                  
                                                                                                                               
                                                        STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS                            
                                                                  DECEMBER 31, 1998 AND 1997                                      
                                                                                                                                
                                                                             1998  
                               --------------------------------------------------------------------------------------------    
                                                                                                                               
                                                                                                                                  
                                 USG COMMON        STABLE          EQUITY                                         SMALL CAP   
                                   STOCK           VALUE           INDEX           BALANCED        GROWTH          EQUITY      
                                   FUND            FUND            FUND             FUND            FUND            FUND       
                                   ----            ----            ----             ----            ----            ----       
<CAPTION>                                                                                                                      
<S>                             <C>             <C>             <C>             <C>             <C>             <C>            
                                                                                                                               
ASSETS:                                                                                                                        
   Investments at                                                                                                              
      Market                    39,561,118      129,354,354     68,948,314      21,338,447      44,834,896      6,094,338      
                                                                                                                               
   Receivables:                                                                                                                
      Employer contributions                                                                                                   
         receivable              1,393,893        3,954,607      2,409,869         859,750      2,133,028         376,659      
      Employee loans                                                                                                           
         receivable                    ---              ---            ---             ---            ---             ---      
    Interest and                                                                                                               
        dividend receivable          6,002           22,790            ---             ---            ---             ---      
                                                                                                                               
    Pending transactions due                                                                                                   
        to loans                       ---              ---            ---             ---            ---             ---      
                              -------------------------------------------------------------------------------------------------
                                                                                                                               
    Total Receivables            1,399,895        3,977,397      2,409,869         859,750      2,133,028         376,659      
                              -------------------------------------------------------------------------------------------------
                                                                                                                               
  Total Assets                  40,961,013      133,331,751     71,358,183      22,198,197     46,967,924       6,470,997      
                              -------------------------------------------------------------------------------------------------
                                                                                                                               
                                                                                                                               
LIABILITIES:                                                                                                                   
                                                                                                                              
      Accrued Administrative                                                                                                   
           Fees                      4,790           27,617          8,553           2,657          5,400            719       
                               ------------------------------------------------------------------------------------------------
                                                                                                                               
  Total Liabilities                  4,790           27,617          8,553           2,657          5,400            719       
                               ------------------------------------------------------------------------------------------------
                
NET ASSETS AVAILABLE                                                                                                           
  FOR PLAN BENEFITS            $40,956,223     $133,304,134    $71,349,630     $22,195,540     $46,962,524    $6,470,278       
                               ================================================================================================
                                                                                                                                
                               INTERNATIONAL                      FORFEITURE     INVESTMENT                
                                   EQUITY           BOND            & CASH          PLAN                    
                                    FUND            FUND            ACCOUNT         LOANS           TOTAL                        
                                    ----            ----            -------         -----           -----                         
                                                                                                                           
<S>                             <C>             <C>             <C>             <C>             <C>       
ASSETS:                                                                                                                           
   Investments at                                                                                                                
      Market                    2,462,450       5,656,053       $856,708      $       ---       319,106,678 
                                                                                                            
   Receivables:                                                                                             
      Employer contributions                                                                                
         receivable               197,871         154,371       (540,000)             ---        10,940,048 
      Employee loans                                                                                        
         receivable                   ---             ---            ---       16,465,003        16,465,003 
    Interest and                                                                                          
        dividend receivable           ---          27,209          4,275              ---            60,276 
                                                                                                          
    Pending transactions due                                                                              
        to loans                      ---             ---            ---           68,400            68,400 
                               ---------------------------------------------------------------------------- 
                                                                                                          
    Total Receivables             197,871         181,580       (535,725)      16,533,403        27,533,727 
                               ---------------------------------------------------------------------------- 
                                                                                                          
  Total Assets                  2,660,321       5,837,633        320,983       16,533,403       346,640,405 
                               ---------------------------------------------------------------------------- 
                                                                                                          
                                                                                                          
LIABILITIES:                                                                                              
                                                                                                          
      Accrued Administrative                                                                              
           Fees                       316             637        (28,490)             ---            22,199 
                               ----------------------------------------------------------------------------- 
                                                                                                          
  Total Liabilities                   316             637        (28,490)             ---            22,199 
                               ----------------------------------------------------------------------------- 
                                                                                                          
NET ASSETS AVAILABLE                                                                                      
  FOR PLAN BENEFITS            $2,660,005      $5,836,996       $349,473      $16,533,403      $346,618,206 
                               ============================================================================= 
 The accompanying notes to financial statements are an integral part of these statements.
</TABLE>
<PAGE>
<TABLE>
                                                                 USG CORPORATION INVESTMENT PLAN

                                                    STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS (Continued)
                                                                  DECEMBER 31, 1998 AND 1997

                                                                           1997
                               ---------------------------------------------------------------------------------------------

                                  USG COMMON      STABLE        GOVERNMENT         EQUITY
                                    STOCK         VALUE         INVESTMENT         INDEX           BALANCED        GROWTH
                                    FUND           FUND            FUND            FUND             FUND            FUND
                                    ----           ----            ----            ----             ----            ----
<CAPTION>
<S>                            <C>             <C>             <C>              <C>             <C>              <C>
ASSETS:
   Investments at
      Market                   $29,734,432     $121,189,170            ---      $49,954,109     $17,415,648      $32,629,299

   Receivables:
      Employer contributions
         receivable              1,234,871        4,309,048            ---        2,304,557         847,104        2,110,024
      Employee loans
         receivable                    ---              ---            ---              ---             ---              ---
      Employee contributions
         receivable                    ---              ---            ---              ---             ---              ---
    Interest and
        dividend receivable          7,687           34,171            ---              ---             ---              ---

    Pending transactions due
        to loan repayments             ---              (38)           ---               (8)            ---              ---

    Total Receivables            1,242,558        4,343,181            ---        2,304,549         847,104        2,110,024
                              ----------------------------------------------------------------------------------------------

  Total Assets                  30,976,990      125,532,351            ---       52,258,658      18,262,752       34,739,323
                              ----------------------------------------------------------------------------------------------


LIABILITIES:

      Accrued Administrative
           Fees                      3,837           24,167            ---            6,665           2,341            4,496

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

  Total Liabilities                  3,837           24,167            ---            6,665           2,341            4,496
                               ---------------------------------------------------------------------------------------------

NET ASSETS AVAILABLE
  FOR PLAN BENEFITS            $30,973,153     $125,508,184            ---      $52,251,993     $18,260,411      $34,734,827
                               ============================================================================================= 




                                          
                                 SMALL CAP      INTERNATIONAL                    FORFEITURE       INVESTMENT
                                  EQUITY           EQUITY             BOND        & CASH            PLAN
                                   FUND             FUND              FUND        ACCOUNT           LOANS             TOTAL
                                   ----             ----              ----        -------           -----             -----
<S>                             <C>              <C>               <C>          <C>           <C>                 <C>

ASSETS:                     
   Investments at           
      Market                    $5,692,313       $2,907,015        $2,586,322   $498,437      $       ---         262,606,745
                            
   Receivables:             
      Employer contributions
         receivable                358,813          182,162            79,881   (350,000)             ---          11,076,460
      Employee loans        
         receivable                    ---              ---               ---        ---       13,799,534          13,799,534
      Employee contributions
         receivable                    ---              ---               ---    150,707              ---             150,707
    Interest and            
        dividend receivable            ---              ---            11,699      3,416              ---              56,973
                            
    Pending transactions due
        to loan repayments          13,683              ---               ---        ---          (13,637)                ---
                                                                  
        Total Receivables          372,496          182,162            91,580   (195,877)      13,785,897          25,083,674
                                ---------------------------------------------------------------------------------------------   
        Total Assets             6,064,809        3,089,177         2,677,902    302,560       13,785,897         287,690,419
                                ---------------------------------------------------------------------------------------------
                                                                                
                            
LIABILITIES:                
                            
      Accrued Administrative
           Fees                        776              396               316     60,780              ---            103,774
                                --------------------------------------------------------------------------------------------
                                                                     
  Total Liabilities                    776              396               316     60,780              ---            103,774
                                --------------------------------------------------------------------------------------------
NET ASSETS AVAILABLE                                                             
  FOR PLAN BENEFITS             $6,064,033       $3,088,781        $2,677,586   $241,780      $13,785,897       $287,586,645
                                ============================================================================================

 The accompanying notes to financial statements are an integral part of these statements.
</TABLE>
<PAGE>
<TABLE>                                                                                                 
                                                                                                        
                                                                                                        
                                                              USG CORPORATION INVESTMENT PLAN           
                                                                                                  
                                                STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS                         
                                                        YEARS ENDED DECEMBER 31, 1998 AND 1997                   
                                                                                                    
                                                                            1998                                                    
                               ---------------------------------------------------------------------------------------------  
                                                                                                       
                                USG COMMON        STABLE             EQUITY                                        SMALL CAP       
                                  STOCK           VALUE              INDEX         BALANCED         GROWTH          EQUITY  
                                  FUND            FUND               FUND           FUND             FUND            FUND    
                                  ----            ----               ----           ----             ----            ----    
<CAPTION>                                                                                                       
<S>                             <C>            <C>                <C>           <C>              <C>              <C>     
                                                                                                        
NET ASSETS AVAILABLE                                                                                                    
  FOR PLAN BENEFITS,                                                                                                    
    beginning of year           $30,973,153    $125,508,184       $52,251,993   $18,260,411      $34,734,827      $6,064,033      
                               ---------------------------------------------------------------------------------------------       
(DEDUCT):                                                                                                   
Corporation contributions         1,920,200       5,561,690         3,312,703     1,193,364        2,953,379         535,663 
                                                                                                        
Employee contributions            3,188,310       8,611,931         5,654,292     2,025,294        5,043,717       1,026,959       
                               ---------------------------------------------------------------------------------------------
                                  5,108,510      14,173,621         8,966,995     3,218,658        7,997,096       1,562,622
                               ---------------------------------------------------------------------------------------------       
                                                                                                       
Income from investments:                                                                                                        
  Dividend income                    83,195             ---           865,418     2,243,748        2,576,354        (135,676)       
  Interest income                   101,008       7,669,673                13             4               10             121     
  Realized gain (loss) on                                                                                                       
    sale of investments          (5,023,627)            ---         5,112,640       631,038        2,342,456        (109,370)       
  Unrealized appreciation                                                                                                       
    for the year                  6,343,112             ---         9,034,583       134,463        4,682,192         294,937 
                               ----------------------------------------------------------------------------------------------
                                  1,503,688       7,669,673        15,012,654     3,009,253        9,601,012          50,012  
                               ----------------------------------------------------------------------------------------------
                                                                                                        
Benefit payments and                                                                                                    
  participant withdrawals        (1,039,834)    (13,057,751)       (2,160,816)   (1,404,678)      (1,477,362)       (229,059)       
                                                                                                        
Participants' elections for                                                                                                     
  transfers between funds                                                                                                       
  or forfeitures                  4,730,695       1,037,071        (2,368,150)     (834,154)      (3,725,803)       (975,098)       
                                                                                                        
Net fund transactions              (265,468)     (1,704,679)         (262,430)      (24,148)        (109,969)          6,159   
  due to loans                                                                                                  
                                                                                                        
Administrative expenses             (54,521)       (321,985)          (90,616)      (29,802)         (57,277)         (8,391) 
                                ---------------------------------------------------------------------------------------------    
Net increase in                                                                                                 
  assets during the year          9,983,070       7,795,950        19,097,637     3,935,129       12,227,697         406,245 
                                ---------------------------------------------------------------------------------------------
                                                                                                        
NET ASSETS AVAILABLE                                                                                                    
  FOR PLAN BENEFITS,                                                                                                    
  end of year                   $40,956,223    $133,304,134       $71,349,630   $22,195,540      $46,962,524      $6,470,278 
                                =============================================================================================     
                                                                                                        
                                                                                                        
                                                                                                        
                              INTERNATIONAL                       FORFEITURE     INVESTMENT                                      
                                 EQUITY            BOND             CASH            PLAN                                    
                                  FUND             FUND            ACCOUNT         LOANS           TOTAL                   
                                  ----             ----            -------         -----           -----                   
NET ASSETS AVAILABLE                                                                                                    
  FOR PLAN BENEFITS,                                                                                                    
    beginning of year           $3,088,781     $2,677,586            $241,780   $13,785,897      $287,586,645                    
                                -----------------------------------------------------------------------------
                                                                                                        
ADD (DEDUCT):                                                                                                   
Corporation contributions          282,533        201,868            (542,220)          ---        15,419,180                      
                                                                                                        
Employee contributions             538,225        290,078                 ---           ---        26,378,806                      
                                -----------------------------------------------------------------------------
                                   820,758        491,946            (542,220)          ---        41,797,986
                                -----------------------------------------------------------------------------                      
                                                                                                        
Income from investments:                                                                                                        
  Dividend income                   20,396        217,947                  10           ---         5,871,392                       
  Interest income                        1         15,513              40,999     1,240,388         9,067,730                       
  Realized gain (loss) on                                                                                                       
    sale of investments           (102,611)       214,907                 ---           ---         3,065,433                       
  Unrealized appreciation                                                                                                       
    for the year                  (131,243)       (90,524)                ---           ---         20,267,520                      
                                 -----------------------------------------------------------------------------
                                  (213,457)       357,843              41,009     1,240,388         38,272,075
                                 -----------------------------------------------------------------------------                      
                                                                                                        
Benefit payments and                                                                                                    
  participant withdrawals         (137,998)      (179,241)            (19,437)     (922,558)       (20,628,734)                    
                                                                                                        
Participants' elections for                                                                                                     
  transfers between funds                                                                                                       
  or forfeitures                  (893,242)     2,572,383             456,298           ---                ---        
                                                                                                      
Net fund transactions                 (494)       (77,809)              9,162     2,429,676                ---    
  due to loans                                                                                                  
                                                                                                        
Administrative expenses             (4,343)        (5,712)            162,881           ---           (409,766)                    
                                -------------------------------------------------------------------------------
                                                                                                        
Net increase in                                                                                                 
  assets during the year          (428,776)     3,159,410             107,693     2,747,506         59,031,561
                                -------------------------------------------------------------------------------
                                                                                                        
NET ASSETS AVAILABLE                                                                                                    
  FOR PLAN BENEFITS,                                                                                                    
  end of year                   $2,660,005     $5,836,996            $349,473    16,533,403       $346,618,206                    
                                ===============================================================================

The accompanying notes to financial statements are an integral part of these statements.
</TABLE>
<PAGE>
<TABLE>

                                                        USG CORPORATION INVESTMENT PLAN                   
                                                                                                                   
                                     STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS (Continued)    
                                                   YEARS ENDED DECEMBER 31, 1998 AND 1997            
                                                                                             
                                                                     1997
                               -----------------------------------------------------------------------------------------------


                                USG COMMON         STABLE            GOVERNMENT     EQUITY
                                  STOCK            VALUE             INVESTMENT     INDEX         BALANCED             GROWTH
                                   FUND            FUND                FUND         FUND            FUND                FUND
                                   ----            ----                ----         ----            ----                ----
<CAPTION>

<S>                             <C>            <C>                  <C>         <C>              <C>                 <C>
NET ASSETS AVAILABLE
  FOR PLAN BENEFITS,
    beginning of year           $18,631,631    $129,617,480         $4,797,995  $32,916,775      $12,489,997         $21,666,547
                                ------------------------------------------------------------------------------------------------

ADD (DEDUCT):
Corporation contributions         1,398,324       7,271,245                ---   2,661,254           975,838           2,447,597

Employee contributions            2,318,484       8,686,104            255,572    4,547,491        1,777,307           4,527,844
                                ------------------------------------------------------------------------------------------------
                                  3,716,808      15,957,349            255,572    7,208,745        2,753,145           6,975,441
                                ------------------------------------------------------------------------------------------------

Income from investments:
  Dividend income                       ---             ---                ---    1,077,313        1,383,387           2,423,257
  Interest income                    39,948       7,640,952            119,041          156              489                 149
  Realized gain (loss) on
    sale of investments          (6,243,322)            ---                ---    1,997,354          338,031             897,796
  Unrealized appreciation
    for the year                 14,736,995             ---                ---    8,598,712        1,303,551           2,692,456
                                ------------------------------------------------------------------------------------------------
                                  8,533,621       7,640,952            119,041   11,673,535        3,025,458           6,013,658
                                ------------------------------------------------------------------------------------------------

Benefit payments and
  participant withdrawals          (887,421)     (9,282,155)          (163,334)  (1,725,328)        (877,034)         (1,199,424)

Participants' elections for
  transfers between funds
  or forfeitures                  1,224,705     (13,227,162)        (5,029,568)   2,713,611          977,761           1,568,768

Net fund transactions              (227,047)     (5,055,099)            20,294     (499,609)         (96,160)           (266,530)
  due to loans

Administrative expenses             (19,144)       (143,181)               ---      (35,736)         (12,756)            (23,633)
                                 ------------------------------------------------------------------------------------------------

Net increase in
  assets during the year         12,341,522      (4,109,296)       (4,797,995)   19,335,218        5,770,414          13,068,280
                                 ------------------------------------------------------------------------------------------------

NET ASSETS AVAILABLE
  FOR PLAN BENEFITS,
  end of year                    $30,973,153   $125,508,184               ---   $52,251,993      $18,260,411         $34,734,827
                                 ================================================================================================





                                  SMALL CAP    INTERNATIONAL                     FORFEITURE       INVESTMENT
                                   EQUITY         EQUITY              BOND         CASH              PLAN
                                    FUND           FUND               FUND        ACCOUNT           LOANS              TOTAL
                                    ----           ----               ----        -------           -----              -----
                                          
NET ASSETS AVAILABLE
  FOR PLAN BENEFITS,
    beginning of year                   ---             ---               ---       $69,590      $7,142,180          $227,332,195
                                 ------------------------------------------------------------------------------------------------

ADD (DEDUCT):
Corporation contributions           406,637         207,461            85,896      (350,000)            ---            15,104,252

Employee contributions              307,799         163,543            40,361          ---              ---            22,624,505
                                 ------------------------------------------------------------------------------------------------
                                    714,436         371,004           126,257      (350,000)            ---            37,728,757
                                 ------------------------------------------------------------------------------------------------

Income from investments:
  Dividend income                   243,301         318,159           113,909           ---             ---            5,559,326
  Interest income                       ---               1                12        26,663         566,254            8,393,665
  Realized gain (loss) on
    sale of investments              32,151         (36,009)            5,986           ---             ---           (3,008,013)
  Unrealized appreciation
    for the year                   (271,521)       (470,957)          (27,803)          ---             ---           26,561,433
                                 -----------------------------------------------------------------------------------------------
                                      3,931        (188,806)           92,104        26,663         566,254           37,506,411
                                 -----------------------------------------------------------------------------------------------

Benefit payments and
  participant withdrawals           (37,806)        (24,679)           (8,568)      (28,952)       (362,067)         (14,596,768)

Participants' elections for
  transfers between funds
  or forfeitures                  5,423,697       2,963,455         2,475,697       909,036             ---                  ---

Net fund transactions               (36,655)        (30,154)           (6,672)     (241,898)      6,439,530                  ---
  due to loans

Administrative expenses              (3,570)         (2,039)           (1,232)     (142,659)            ---             (383,950)
                                 ------------------------------------------------------------------------------------------------

Net increase in
  assets during the year          6,064,033       3,088,781         2,677,586       172,190       6,643,717           60,254,450
                                 ------------------------------------------------------------------------------------------------

NET ASSETS AVAILABLE
  FOR PLAN BENEFITS,
  end of year                    $6,064,033      $3,088,781        $2,677,586      $241,780     $13,785,897         $287,586,645
                                 ================================================================================================


The accompanying notes to financial statements are an integral part of these statements.
</TABLE>
USG CORPORATION
INVESTMENT PLAN

NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 1998 AND 1997


1.  DESCRIPTION OF THE PLAN

         The USG Corporation Investment Plan, also known as the USG
         Corporation Investment Plan for Salaried Employees prior to January
         1, 1989 ("The Plan"), was approved by the stockholders of the
         Corporation on May 11, 1977, and became effective on July 1, 1977.
         The Plan was subsequently amended and completely restated effective
         as of January 1, 1989 and most recently as of July 1, 1997
         ("restated Plan").  The amendments and restatements incorporate all
         prior amendments to the Plan and make changes to reflect the merger
         of the USG Corporation Savings Plan for Hourly Employees and change
         the name of the Plan to the USG Corporation Investment Plan,
         effective January 1, 1989; and to implement the daily valuation of
         investments in the participants accounts at fair market value on
         each business day effective July 1, 1997.
 
         The Plan was established to provide a means for eligible hourly and
         salaried employees to participate in the earnings of the
         Corporation, to build a supplemental retirement fund and to provide
         additional disability and death benefits.
 
         The Plan provides, among other things, that participants may
         contribute up to 15% (9% for highly compensated employees) of their
         eligible pay to the Plan through payroll deductions on a before-tax
         basis during the year effective January 1, 1998, 12% from July 1,
         1997 to December 31, 1997, 9% from January 1, 1989 to June 30, 1997,
         15% from October 1, 1985 to December 31, 1988 and 12% prior to
         October 15, 1985.  The amount of distributions to be made upon
         withdrawal from the Plan is dependent upon the participant's and the
         Corporation's contributions.  The Plan requires completion of five
         years of credited service in order to be 100% vested in the
         Corporation contribution.  Employee contributions are always 100%
         vested.  In addition, the Plan contains provisions under which the
         entire amount credited to a participant's account is distributable
         upon a participant's retirement, disability, or death.

         Employee contributions are invested by the Trustee in any one or a
         combination of eight funds: (a) common stock of USG Corporation (USG
         Common Stock Fund), (b) an equity index fund which provides
         investment results that are designed to correspond to the
         performance of publicly traded common stocks, as represented by the
         Standard & Poor's 500 Composite Stock Price Index (Equity Index
         Fund),  (c) a balanced fund which invests in several broadly
         diversified asset classes, including domestic and foreign common
         stock and bonds, preferred stocks and cash (Balanced Fund), (d) a
         growth fund which invests primarily in equity securities of large
         market capitalization companies with earnings that are expected to
         grow at an above-average rate, but may be further diversified by
         investment of a small portion of the assets in domestic bonds,
         foreign common stocks and bonds, and cash (Growth Fund), (e) a small
         cap equity fund which seeks maximum long-term growth of capital by
         investing in common stock of rapidly growing U.S. companies with
         market capitalization of less than $1 billion at the time of initial
         investment (Small Cap Equity Fund), (f) an international equity fund
         which seeks long-term capital appreciation through investments in
         common stock of established non-U.S. companies (International Equity
         Fund), (g) a bond fund which seeks to provide current income and
         preservation of capital by investing in investment grade corporate
         debt securities, government bonds and mortgages in both U.S. and
         foreign markets, (Bond Fund) or (h) a managed separate account which
         seeks to preserve principal and income while maximizing current
         income by investing in a diversified pool of Guaranteed Investment
         Contracts (GICs), separate account GICs, synthetic GICs or
         Structured Investment Contracts (SICs) and Bank Investment Contracts
         (BICs) of varying maturity, size and yield (Stable Value Fund).
 
         Effective July 1, 1997, the Stable Value Fund replaced the Fixed
         Income Fund and the Government Investment Fund.  All existing
         balances in the Fixed Income Fund and the Government Investment Fund
         were transferred to the Stable Value Fund on July 1, 1997.
 
         The Equity Index Fund is invested in the Vanguard Institutional
         Index Fund.
 
         The Balanced Fund is invested in the Fidelity Puritan Fund.
 
         The Growth Fund is invested in the American Express/IDS New
         Dimensions Fund.
 
         The Small Cap Equity Fund is invested in the Franklin Small Cap
         Growth Fund - Class A.
 
         The International Equity Fund is invested in the Templeton Foreign
         Fund - Class A.
 
         The Bond Fund is invested in the PIMCO Total Return Fund -
         Institutional Class.
 
         The Stable Value Fund is managed by PRIMCO Capital Management.  At
         December 31, 1998, the Stable Value Fund was primarily composed of
         group annuity contracts maintained by Aetna Life & Casualty Company,
         Bankers Trust, Monumental Life Insurance Company, Jackson National
         Life Insurance Company, Allstate Insurance Company, John Hancock
         Mutual Life Insurance Company and SunAmerica Life Insurance Company.
 
         Participants may elect to have their contributions invested in 1%
         increments in any fund or combination of funds and to change their
         contribution rate, suspend or resume their contributions, change
         their investment allocations, transfer their investments from one
         fund to another and apply for a loan by calling the USG Investment
         Plan Connection, an automated telephone service, on any day.
         Certain Executive officers of the Corporation must pre-clear any
         transfer in or out of the USG Common Stock Fund with the USG
         Corporate Secretary.
 
         The Corporation made a regular 25% matching contribution up to the
         first 6% of the participants eligible pay contributed to the Plan,
         credited to the participants accounts each pay period.

         In addition, the Corporation also made an annual profit sharing
         matching contribution of up to 9% of the participants eligible pay
         contributed to the Plan based on achievement of at least 80% of the
         corporate consolidated earnings goal for the plan year.
 
         The Plan was amended effective January 1, 1999 to provide for
         immediate eligibility and enrollment to join the Plan for newly
         hired employees and current employees who are in their one year
         waiting period as of January 1, 1999, unless the employee elects not
         to join the Plan.
 
         If the Trustee is unable to invest any contributions immediately,
         the funds are temporarily invested in short-term investment funds
         and any earnings in the fund are credited to the participants'
         accounts.
 
         The Plan funds are administered under the terms of a Trust agreement
         with The Northern Trust Company.  The Trust agreement provides,
         among other things, that the Trustee shall keep account of all
         investments, receipts and disbursements and other transactions and
         shall provide annually a report setting forth such transactions and
         the status of the funds at the end of the period.
 
         The Plan is administered by the Pension and Investment Committee,
         which consists of five members appointed by the Corporation.
         Administrative expenses and other fees of the Plan are shared by the
         Corporation and the participants.
 
         At December 31, 1998 and 1997, there were approximately 8,932 and
         9,013 participants in the Plan, respectively.
 
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
         The amounts in the accompanying statements were accumulated from the
         reports of the Trustee (Note 1).  The financial statements of the
         Plan are prepared under the accrual method of accounting.
         Contributions to the Plan are made throughout the year and
         adjustments are made to the financial statements to accrue for the
         portion of annual contributions unpaid at year-end.
 
         The preparation of financial statements in conformity with generally
         accepted accounting principles requires management to make estimates
         and assumptions that affect the reported amounts of assets,
         liabilities, and changes therein, and disclosure of contingent
         assets and liabilities.  Actual results could differ from those
         estimates.
 
         The Plans investments are stated at market value except for its
         group annuity contracts with insurance companies, which are valued
         at contract value because they are fully benefit responsive.  For
         example, participants may ordinarily direct the withdrawal or
         transfer of all or a portion of their investment at contract value.
         There are no reserves against contract value for credit risk of the
         contract issuers.  Market value and cost are equal for the group
         annuity contracts and short-term investments.  Shares of registered
         investment companies are valued at quoted market prices which
         represent the net asset value of shares held by the Plan at year-
         end.  The Company stock is valued at its quoted market price.
         Participant loans receivable are valued at cost which approximates
         fair value.
 
         Purchases and sales of securities are recorded on a trade-date
         basis. Interest income is recorded on the accrual basis.  Dividends
         are recorded on the ex-dividend date.  Realized gains or losses on
         the sale of investments are calculated based upon the historical
         average cost of the investments.  Unrealized appreciation or
         depreciation of investments of the Plan represents the change
         between years in the difference between the market value and cost of
         the investments.
 
         The guaranteed investment contracts in the Stable Value Fund earned
         guaranteed interest at rates varying from 4.33% to 6.80% at December
         31, 1998.  The rates for 1997 ranged from 5.66% to 6.80%.  The
         guaranteed investment contracts earnings are calculated net of
         administrative fees.
 
         For the USG Common Stock Fund, cost was $50,887,831 and $47,478,648
         as of December 31, 1998 and 1997, respectively.  For the Equity
         Index Fund, market value exceeded cost by $26,834,737 and
         $17,800,155 at December 31, 1998, and 1997, respectively.  For the
         Balanced Fund, market value exceeded cost by $2,124,574 and
         $1,990,111 at December 31, 1998, and 1997, respectively.  For the
         Growth Fund, market value exceeded cost by $11,579,622 and
         $6,897,431 at December 31, 1998 and 1997, respectively. For the
         Small Cap Equity Fund, market value exceeded cost at December 31,
         1998, by $23,416 and cost was greater than market value by $271,521
         at December 31, 1997.  Cost exceeded market value for the
         International Equity Fund, by $602,200 and $470,957 at December 31,
         1998, and 1997, respectively.  For the Bond Fund, cost exceeded
         market value by $118,327 and $27,803 at December 31, 1998, and 1997,
         respectively.  The Small Cap Equity Fund, International Equity Fund
         and the Bond Fund were introduced to the Plan on July 1, 1997.
 
         Pending transactions due to loan repayments represent loan
         repayments received from participants by the Trustee before year-
         end.  In order to present the proper balance of net assets in each
         fund at year-end, a net receivable or payable was used to record
         such pending transactions and are shown on the accompanying
         statements of net assets available for benefits.
 
         The net amount of transfers in or out of each fund during the year
         for participants' elections for transfers between funds and net loan
         transactions for the funding of new loans and repayments on existing
         loans are shown on the accompanying statements of changes in net
         assets available for benefits.
 
         Benefits are recorded when paid.

3. TAX STATUS

         The Plan, as amended and restated, effective July 1, 1997, meets the
         requirements of Section 401 (a) of the Internal Revenue Code and,
         accordingly, its income is exempt from Federal income tax under
         Section 501 (a).  Employer contributions and the income of the Plan
         are not taxable to the participants until distributions are made.
 

4. EMPLOYER CONTRIBUTIONS

         The Corporation will make a formula matching contribution with
         respect to each eligible participant only if at least 80% of the
         Corporation's consolidated earnings goal is met.
 
         The Corporation formula matching contribution schedule was changed
         for the 1995 Plan year.  Beginning January 1, 1995, each 1% increase
         in goal attainment from 80% to 100% of goal results in a
         corresponding 1.5% increase in the profit sharing match, starting at
         a 10% match with the attainment of 80% of earnings goal.  Each 1%
         increase in goal attainment from 100% to 140% of goal will result in
         a 1% increase in the profit sharing match, starting from a 40% match
         with attainment of 100% of goal earnings.  And each 1% increase in
         goal attainment above 140% results in a 2% increase in the profit
         sharing match, starting from 80% matching with attainment of 140% of
         goal earnings.
 
         Employer contribution amounts forfeited by terminated employees are
         applied as a credit against future Corporate contributions or used
         to pay administrative expenses and other fees of the plan and are
         held in the Forfeiture Cash Account.
 
 
5. DISTRIBUTION ON TERMINATION OF THE PLAN

         In the event of any termination of the Plan, the account balances
         of all affected participants shall become non-forfeitable.

<PAGE>
6. INVESTMENTS

         The following is a summary of the Plan's investments as well as
         the net realized and unrealized appreciation (depreciation) for
         1998 and 1997:

<TABLE>
                      December 31, 1998             DECEMBER 31, 1997     
                      -----------------             -----------------     
INVESTMENTS AT
FAIR VALUE                          NET                           NET
DETERMINED BY                   APPRECIATION                  APPRECIATION
QUOTED MARKET         FAIR     (DEPRECIATION)       FAIR     (DEPRECIATION)
PRICE:               VALUE     IN FAIR VALUE       VALUE     IN FAIR VALUE
                     -----     -------------       -----     -------------
<CAPTION>
<S>               <C>            <C>            <C>           <C>
USG Common
  Stock           $37,948,896    $ 1,319,485    $28,148,393   $ 8,493,673
Vanguard Index
  Trust            68,948,314     14,147,223     49,954,109    10,596,066
Fidelity Puritan
  Fund             21,338,448        765,501     17,415,648     1,641,582
IDS New Dimension
  Fund             44,834,896      7,024,648     32,629,299     3,590,252
Franklin Small Cap
  Growth Fund       6,094,338        185,567      5,692,313    (  239,370)
Templeton Foreign
  Fund              2,462,450     (  233,854)     2,907,015    (  506,966)
PIMCO Total Return
  Fund              5,656,053        124,383      2,586,297    (   21,817)
                  --------------------------------------------------------
SUB-TOTAL         187,283,395     23,332,953    139,333,074    23,553,420 
                  --------------------------------------------------------
INVESTMENTS AT
FAIR VALUE
DETERMINED BY
OTHER THAN
QUOTED MARKET
PRICE:

Mortgages,
  Notes,
  Contracts       125,741,562         ---       116,977,010        ---
Collective
  Short-Term
  Investment
  Fund              6,081,721         ---         6,296,661        ---   
                 --------------------------------------------------------
SUB-TOTAL         131,823,283         ---       123,273,671        ---   
                 -------------------------------------------------------- 
TOTAL
INVESTMENTS      $319,106,678   $ 23,332,953   $262,606,745  $ 23,553,420
                 ========================================================
</TABLE>

<TABLE>
At December 31, 1998 and 1997, the following investments exceeded 5% of
the net assets available for the Plan benefits:
<CAPTION>
                                     1998                 1997
                                     ----                 ----
<S>                              <C>                  <C>
USG Corporation Common Stock     $37,948,896          $28,148,393

Allstate Insurance Company
  Contract 77032                  22,018,078           22,953,629

Jackson National Life Insurance
  Contract S-1129-1               22,965,801           23,438,942

SunAmerica Life Insurance
  Company, GAC 4653               23,611,436           22,070,890

Vanguard Index Trust              68,948,314           49,954,109

IDS New Dimension Fund            44,834,896           32,629,299

Fidelity Puritan Fund             21,338,448           17,415,648
</TABLE>



7. PARTICIPANT LOANS

         Effective October 1, 1993, and as revised on July 1, 1997, a
         participant can obtain loans from the Plan.  Under the Plan's loan
         provisions, the maximum loan allowable is one half of a
         participant's vested account balance or $50,000, whichever is less.
         The minimum loan amount is $1,000.  Additional amounts can be taken
         in $1 increments.  A participant must have a vested account balance
         of at least $2,000 before he or she can apply for a loan.  The Plan
         restricts the participant to no more than two loans outstanding at
         a time.  Most loans can be repaid by the participant over a five
         year period, or sooner, in full, with interest at the prime rate in
         effect at the time of requesting the loan.  A residential loan can
         be repaid over a period of up to 30 years.  Default on a loan by a
         participant is treated as a hardship withdrawal and subject to IRS
         penalties.
<PAGE>
<TABLE>

                                   SCHEDULE I
                                 USG CORPORATION
                                 INVESTMENT PLAN

                    SCHEDULE OF INVESTMENTS HELD AT YEAR END
                                DECEMBER 31, 1998

                                      PRINCIPAL
                                   AMOUNT/NUMBER OF                     FAIR
                                       SHARES           COST            VALUE   
                                       ------           ----            -----   
COMMON STOCK
<CAPTION>
   <S>                             <C>              <C>             <C>
   USG Corporation                      745,009     $ 50,887,831    $ 37,948,896
   Vanguard Index Trust                 610,973       42,113,577      68,948,314
   Fidelity Puritan Fund              1,063,201       19,213,874      21,338,448
   IDS New Dimension Fund             1,554,339       33,255,274      44,834,896
   Franklin Small Cap
        Growth Fund                     270,019        6,070,922       6,094,338
   Templeton Foreign Fund               293,498        3,064,650       2,462,450
                                      ------------------------------------------
      TOTAL COMMON STOCK                             154,606,128     181,627,342
                                                     ---------------------------
CORPORATE BONDS

   PIMCO Total Return Fund              536,627        5,774,380       5,656,053
                                       -----------------------------------------
CONTRACTS

   Aetna Life & Casualty
     Company,  GAC 14603           $  3,242,043        3,242,043       3,242,043
   Bankers Trust, GAC 97-157       $ 11,735,619       11,735,619      11,735,619
   Monumental Life Insurance
     Company, GAC ADA00259TR       $ 14,643,944       14,643,944      14,643,944
   Jackson National Insurance
     Company, GAC 1125             $  7,121,536        7,121,536       7,121,536
   John Hancock Mutual Life
     Insurance Co., GAC 8396-1     $  6,041,954        6,041,954       6,041,954
   John Hancock Mutual Life
     Insurance Co., GAC 9532       $ 11,331,471       11,331,471      11,331,471
   State Street Bank & Trust,
     Contract 98203                $  2,025,714        2,025,714       2,025,714
   SunAmerica Life Insurance
     Company, GAC 4653             $ 23,611,436       23,611,436      23,611,436
   Transamerica Life
     & Annuity, GAC 76879          $  1,003,966        1,003,966       1,003,966
   Allstate Insurance Company
     Contract 77032                $ 22,018,078       22,018,078      22,018,078
   Jackson National Insurance Co.
     Contract S-1129-1             $ 22,965,801       22,965,801      22,965,801
                                   ---------------------------------------------
      TOTAL CONTRACTS              $125,741,562      125,741,562     125,741,562
                                   ---------------------------------------------
SHORT-TERM INVESTMENTS

   Collective Short-Term
     Investment Fund               $  6,081,721        6,081,721       6,081,721
                                   ---------------------------------------------

      TOTAL INVESTMENTS                             $292,203,791    $319,106,678
                                                    ----------------------------
</TABLE>

                                 USG CORPORATION
                                 INVESTMENT PLAN


                       SCHEDULE OF REPORTABLE TRANSACTIONS
                      FOR THE YEAR ENDED DECEMBER 31, 1998



SERIES OF TRANSACTIONS IN THE SAME SECURITY:


                     TOTAL         COST        TOTAL       CURRENT
  DESCRIPTION OF   NUMBER OF        OF       NUMBER OF     VALUE OF
    SECURITY       PURCHASES       ASSET       SALES        SALES  
    --------       ---------       -----       -----        -----  
  None.




                     CONSENT OF INDEPENDENT PUBLIC AUDITORS

                            WITH RESPECT TO FORM S-8


     As independent  public auditors,  we hereby consent to the incorporation by
reference of our report,  dated March 17, 1999, appearing in the USG Corporation
Investment Plan Annual Report on Form 11-K for the year ended December 31, 1998,
into USG  Corporation's  previously filed  Registration  Statements No. 2-94787,
33-63554  and 33- 9948 on Form S-8. It should be noted that we have not examined
any financial statements of the Investment Plan subsequent to December 31, 1998,
or performed any audit procedures subsequent to the date of our report.


/s/ Hill, Taylor LLC
- --------------------



Chicago, Illinois
March 17, 1999



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