FORM 10-Q

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

(Mark One)
           [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                 For the Quarterly Period Ended: March 31, 1999
                                                 --------------

                                      OR

          [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

              For the transition period from __________ to ___________.
 
                         Commission File Number: 1-10551
                                                 -------

                               Omnicom Group Inc.
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)


     New York                                             13-1514814
- --------------------------------------------------------------------------------
(State or other jurisdiction of                        (IRS Employer
incorporation or organization)                         Identification No.)


 437 Madison Avenue, New York, New York                       10022
- --------------------------------------------------------------------------------
(Address of principal executive offices)                   (Zip Code)


     (212) 415-3600
- --------------------------------------------------------------------------------
(Registrant's telephone number, including area code)

Not Applicable
- --------------------------------------------------------------------------------
(Former name, former address and former fiscal year, if changed since 
last report)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days.     Yes X     No 
                                          ----     ----

Indicate the number of shares  outstanding  of each of the  issuer's  classes of
common stock, as of the latest  practicable  date.  178,881,900 (as of April 30,
1999)



                       OMNICOM GROUP INC. AND SUBSIDIARIES
                                      INDEX


                                                                        Page No.
                                                                        --------


PART I. FINANCIAL INFORMATION


     Item 1.      Financial Statements.

                  Consolidated Condensed Balance Sheets -                   
                      March 31, 1999, December 31, 1998 and
                      March 31, 1998                                        2

                  Consolidated Condensed Statements of Income -
                      Three Months Ended March 31, 1999 and 1998            3

                  Consolidated Condensed Statements of Cash Flows -
                      Three Months Ended March 31, 1999 and 1998            4

                  Notes to Consolidated Condensed Financial
                      Statements                                            5-10

     Item 2.      Management's Discussion of Financial Condition
                      And Results of Operations.                           11-17

     Item 3.      Quantitative and Qualitative Disclosures About
                      Market Risk.                                          18

PART II.          OTHER INFORMATION

     Item 6.      Exhibits and Reports of Form 8-K.                         21


                                       1


                          PART I. FINANCIAL INFORMATION
                          Item 1. Financial Statements
                       OMNICOM GROUP INC. AND SUBSIDIARIES
                     CONSOLIDATED CONDENSED BALANCE SHEETS
                             (Dollars in Thousands)


                          Assets                                                                     
                          ------                                                   March 31,         December 31,       March 31,
                                                                                     1999                1998             1998
                                                                                -------------       -------------    --------------
                                                                                                                       
Current assets:
   Cash and cash equivalents                                                    $     310,673       $     648,781    $      283,221
   Investments available-for-sale, at market, which approximates cost                  47,674              68,610            74,657
   Accounts receivable, less allowance for doubtful accounts
     of $54,187, $58,240 and $41,400                                                2,758,269           2,688,649         2,308,817
   Billable production orders in process, at cost                                     282,386             255,294           282,349
   Prepaid expenses and other current assets                                          478,391             448,496           364,063
                                                                                -------------       -------------    --------------
         Total Current Assets                                                       3,877,393           4,109,830         3,313,107

Furniture, equipment and leasehold improvements at cost, less
  accumulated depreciation and amortization of $459,584
  $444,670 and $385,684                                                               374,024             375,649           331,727
Investments in affiliates                                                             312,440             262,392           226,233
Intangibles, less amortization of $304,340, $284,663 and $243,913                   2,049,154           2,071,724         1,796,995
Deferred tax benefits                                                                  94,610             104,875            82,828
Deferred charges and other assets                                                     202,615             199,056           146,283
                                                                                -------------       -------------    --------------
                                                                                $   6,910,236       $   7,123,526    $    5,897,173
                                                                                =============       =============    ==============
       Liabilities and Shareholders' Equity
       ------------------------------------
Current liabilities:
   Accounts payable                                                             $   2,824,329       $   3,366,086    $    2,403,590
   Payable to banks and current portion of long-term debt                             253,569             139,894           338,427
   Other accrued liabilities                                                        1,328,865           1,474,811         1,187,459
   Accrued taxes on income                                                             65,791              59,797            69,382
                                                                                -------------       -------------    --------------
         Total Current Liabilities                                                  4,472,554           5,040,588         3,998,858

Long term debt                                                                        662,293             268,913           203,479
Convertible subordinated debentures                                                   448,497             448,497           448,500
Deferred compensation and other liabilities                                           237,272             229,239           220,505
Minority interests                                                                     75,853              90,778            68,120

Shareholders' equity:
   Common stock                                                                        93,525              93,328            92,355
   Additional paid-in capital                                                         733,597             720,343           647,191
   Retained earnings                                                                  667,939             628,743           468,458
   Unamortized restricted stock                                                       (52,727)            (58,060)          (42,706)
   Accumulated other comprehensive income                                            (119,154)            (94,781)          (48,984)
   Treasury stock                                                                    (309,413)           (244,062)         (158,603)
                                                                                -------------       -------------    --------------
         Total Shareholders' Equity                                                 1,013,767           1,045,511           957,711
                                                                                -------------       -------------    --------------
         Total Liabilities and Shareholders' Equity                             $   6,910,236       $   7,123,526    $    5,897,173
                                                                                =============       =============    ==============


The accompanying notes to consolidated condensed financial statements are
an integral part of these statements.


                                       2


                       OMNICOM GROUP INC. AND SUBSIDIARIES
                   CONSOLIDATED CONDENSED STATEMENTS OF INCOME
                  (Dollars in Thousands, Except Per Share Data)

                                              Three Months Ended March 31,
                                            ---------------------------------
                                                 1999               1998
                                            -------------        ------------
Commissions and fees                        $   1,146,877        $    905,799

Operating expenses:
         Salaries and related costs               688,301             552,164
         Office and general expenses              324,006             251,988
                                            -------------        ------------
                                                1,012,307             804,152
                                            -------------        ------------

Operating profit                                  134,570             101,647

Net interest expense:
         Interest and dividend income              (7,225)             (6,927)
         Interest paid or accrued                  18,472              14,214
                                            -------------        ------------
                                                   11,247               7,287
                                            -------------        ------------

Income before income taxes                        123,323              94,360

Income taxes:
         Federal                                   20,079              15,330
         State and local                            7,476               6,355
         International                             22,960              17,696
                                            -------------        ------------
         Total income taxes                        50,515              39,381
                                            -------------        ------------

Income after income taxes                          72,808              54,979 
Equity in affiliates                                  929               4,086
Minority  interests                                (8,175)             (7,741)  
                                            -------------        ------------  
         Net income                         $      65,562        $     51,324 
                                            =============        ============


Net Income Per Common Share:
- ----------------------------

Net income:
     Basic                                      $    0.37            $  0.30
     Diluted                                    $    0.37            $  0.29

Dividends declared per common share             $    0.15            $  0.125

The accompanying notes to consolidated condensed financial statements are 
an integral part of these statements.


                                       3


                       OMNICOM GROUP INC. AND SUBSIDIARIES
                 CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS
                             (Dollars in Thousands)



                                                                              Three Months Ended
                                                                                 March 31,
                                                                       -----------------------------
                                                                           1999              1998
                                                                       -----------       -----------
                                                                                           
Cash flows from operating activities:
     Net income                                                        $    65,562       $    51,324
     Adjustments to reconcile net income to net cash
       used for operating activities:
     Depreciation and amortization of tangible assets                       22,889            18,544
     Amortization of intangible assets                                      16,849            10,915
     Minority interests                                                      8,175             7,741
     Earnings of affiliates less than 
       (in excess of) dividends received                                       945            (1,673)
     Decrease in deferred tax benefits                                       1,065             1,771
     Provision for losses on accounts receivable                             2,344             1,754
     Amortization of restricted stock                                        5,273             4,482
     (Increase) decrease  in accounts receivable                          (140,594)            5,437
     Increase in billable production orders in process                     (20,605)          (74,093)
     Increase in prepaid expenses and other current assets                 (39,394)          (19,077)
     Decrease in accounts payable                                         (465,440)         (512,684)
     Decrease in other accrued liabilities                                (114,084)          (90,104)
     Increase (decrease) in accrued taxes on income                         10,211           (33,928)
     Other                                                                   1,719             2,295
                                                                       -----------       -----------
         Net cash used for operating activities                           (645,085)         (627,296)
                                                                       -----------       -----------
Cash flows from investing activities:
     Capital expenditures                                                  (27,163)          (25,295)
     Payments for purchases of equity interests in
       subsidiaries and affiliates, net of cash acquired                  (108,409)         (239,823)
     Proceeds from sales of equity interests in
       subsidiaries and affiliates                                             634               869
     Payments for purchases of investments available-for-sale
       and other investments                                               (21,278)          (15,136)
     Proceeds from sales of investments available-for-sale
       and other investments                                                37,518            27,785
                                                                       -----------       -----------
         Net cash used for investing activities                           (118,698)         (251,600)
                                                                       -----------       -----------
Cash flows from financing activities:
     Net borrowings under lines of credit                                  109,117            86,497
     Share transactions under employee stock plans                          13,484              (659)
     Proceeds from issuance of shares                                           --           171,035
     Proceeds from issuance of debt obligations                            476,778           391,045
     Repayments of principal of debt obligations                           (59,345)           (5,497)
     Dividends and loans to minority shareholders                          (16,473)           (8,426)
     Dividends paid                                                        (25,069)          (19,908)
     Purchase of treasury shares                                           (72,524)          (18,437)
                                                                       -----------       -----------
         Net cash provided by financing activities                         425,968           595,650
                                                                       -----------       -----------
Effect of exchange rate changes on cash and cash equivalents                  (293)            1,329
                                                                       -----------       -----------
     Net decrease in cash and cash equivalents                            (338,108)         (281,917)
Cash and cash equivalents at beginning of period                           648,781           565,138
                                                                       -----------       -----------
Cash and cash equivalents at end of period                             $   310,673       $   283,221
                                                                       ===========       ===========
Supplemental Disclosures:
     Income taxes paid                                                 $    35,205       $    75,257
                                                                       ===========       ===========
     Interest paid                                                     $    19,191       $    12,897
                                                                       ===========       ===========


The accompanying notes to consolidated condensed financial statements are 
an integral part of these statements.


                                       4


                       OMNICOM GROUP INC. AND SUBSIDIARIES
              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------

1)          The consolidated  condensed  interim financial  statements  included
      herein have been prepared by the Company,  without audit,  pursuant to the
      rules and regulations of the Securities and Exchange  Commission.  Certain
      information  and  footnote  disclosures  normally  included  in  financial
      statements  prepared in  accordance  with  generally  accepted  accounting
      principles  have been  condensed  or  omitted  pursuant  to such rules and
      regulations.   All  prior  period  amounts  included  in  these  financial
      statements  have been restated to reflect the effect of accounting for the
      acquisition  of Abbott  Mead  Vickers  Plc as a  pooling-of-interests (see
      footnote number 8).

2)          These  statements  reflect  all  adjustments,  consisting  of normal
      recurring accruals, which in the opinion of management,  are necessary for
      a  fair  presentation  of  the  information  contained  therein.   Certain
      reclassifications have been made to the March 31, 1998 reported amounts to
      conform them with the March 31, 1999 and  December 31, 1998  presentation.
      These  consolidated  condensed  financial  statements  should  be  read in
      conjunction with the consolidated  financial  statements and notes thereto
      included in the  Company's  annual  report on Form 10-K for the year ended
      December 31, 1998.

3)          Results  of  operations  for  interim  periods  are not  necessarily
      indicative of annual results.


                                       5


                       OMNICOM GROUP INC. AND SUBSIDIARIES
        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------

4)          Basic  earnings per share is based upon the weighted  average number
      of common shares outstanding during the period. Diluted earnings per share
      is based on the above,  plus, if dilutive,  common share equivalents which
      include  outstanding  options  and  restricted  shares,  and if  dilutive,
      adjusted  for the  assumed  conversion  of the  Company's  2.25% and 4.25%
      Convertible  Subordinated  Debentures (the  "Debentures")  and the assumed
      increase in net income for the after tax interest cost of the  Debentures.
      In determining if the Debentures were dilutive at March 31, 1999 and 1998,
      the Debentures  were assumed to be converted for the entire  quarter.  For
      purposes of  computing  diluted  earnings  per share for the three  months
      ended March 31, 1999 and 1998,  respectively,  178,357,000 and 174,388,000
      common  share   equivalents   were  assumed  to  have  been   outstanding.
      Additionally,  for the three months ended March 31, 1999 6,936,000  shares
      were  assumed to have been  converted  related to the  Debentures  and the
      assumed increase in net income used in the computation was $2,385,000. The
      number of shares used in the  computations  of basic and diluted  earnings
      per share were as follows:

                                                   Three Months
                                                   Ended March 31,
                                                   ---------------

                                                 1999            1998
                                                 ----            ----

         Basic EPS                           175,329,000       171,032,000
         Diluted EPS                         185,293,000       174,388,000


                                       6


                       OMNICOM GROUP INC. AND SUBSIDIARIES
        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------

            For purposes of computing  diluted  earnings per share for the three
      months ended March 31, 1999, the Company's 2.25% Convertible  Subordinated
      Debentures were not reflected in the computation, as their inclusion would
      have been  anti-dilutive.  For purposes of computing  diluted earnings per
      share for the three months ended March 31, 1998, the  Debentures  were not
      reflected  in  the  computation,   as  their  inclusion  would  have  been
      anti-dilutive.

5)          Total comprehensive income and its components were as follows:

                                                           Three Months 
                                                          Ended March 31, 
                                                      ---------------------
                                                      (Dollars in Thousands)
                                                        1999        1998
                                                      --------    ---------

      Net Income                                      $ 65,562    $ 51,324
      Other Comprehensive Income -
        Foreign Currency Translation
        Adjustments                                    (24,373)     (1,626)
                                                      --------    --------
      Comprehensive Income                            $ 41,189    $ 49,698
                                                      ========    ========

6)          In June 1998,  the Financial  Accounting  Standards  Board  ("FASB")
      issued Statement of Financial  Accounting  Standards No. 133,  "Accounting
      for Derivative  Instruments and Hedging Activities" ("SFAS No. 133") which
      the Company is required to adopt  effective  January 1, 2000. SFAS No. 133
      cannot be applied  retroactively.  SFAS No. 133 establishes accounting and
      reporting standards requiring that every derivative  instrument (including
      certain derivative instruments embedded


                                       7


                       OMNICOM GROUP INC. AND SUBSIDIARIES
        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------

      in other contracts) be recorded in the balance sheet as either an asset or
      liability  measured at its fair value.  SFAS No. 133 requires that changes
      in the derivative's fair value be recognized  currently in earnings unless
      specific  hedge  accounting  criteria  are  met.  Special  accounting  for
      qualifying hedges allows a derivative's gains and losses to offset related
      results on the hedged item in the income  statement,  and requires  that a
      company must formally document, designate, and assess the effectiveness of
      transactions that receive hedge accounting. Once implemented, SFAS No. 133
      must be applied to (a) derivative  instruments and (b) certain  derivative
      instruments  embedded in hybrid contracts that were issued,  acquired,  or
      substantively modified after December 31, 1997.

                   The Company intends to adopt SFAS No. 133 for its fiscal year
      ending December 31, 2000.  The impact of  SFAS  No. 133  on  the Company's
      financial statements  will  depend  on  a  variety  of  factors, including
      future  interpretative  guidance  from  the  FASB,  the  future  level  of
      forecasted and actual foreign currency transactions,  the  extent  of  the
      Company's hedging activities, the types of hedging  instruments  used  and
      the effectiveness of  such  instruments.  However,  the  Company  does not
      believe  the  effect  of  adopting  SFAS  No. 133  will be material to its
      financial position.


                                       8


                       OMNICOM GROUP INC. AND SUBSIDIARIES
        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------

7)          The Company's  wholly-owned and  partially-owned  businesses operate
      within the corporate  communications  services  operating  segment.  These
      businesses provide a variety of communications services to clients through
      several  worldwide,  national and regional  independent agency brands. The
      businesses  exhibit  similar  economic  characteristics  driven from their
      consistent efforts to create customer driven marketing  communications and
      services that build their clients  businesses.  A summary of the Company's
      operations by geographic  area as of March 31, 1999 and 1998,  and for the
      three months then ended is presented below:



                                                          (Dollars in Thousands)
                                       --------------------------------------------------------------------------------

                                         United     United                       Other        Other
                                         States    Kingdom  Germany   France     Europe    International   Consolidated
                                         ------    -------  -------   ------     ------    -------------   ------------

                                                                                              
1999 
     Commissions and Fees              $587,212   $164,751  $91,621  $83,895   $116,195      $103,203       $1,146,877
     Long-Lived Assets                  162,619     99,698   11,441   15,648     25,179        59,439          374,024

1998
     Commissions and Fees              $475,161   $137,824  $70,135  $41,766   $ 92,076      $ 88,837       $  905,799
     Long-Lived Assets                  164,961     82,942   10,136   14,569     26,226        32,893          331,727

8)          On February 10, 1999, the Company completed the acquisition of
      Abbott Mead Vickers plc ("AMV").  AMV  provides  corporate  communications
      services to clients principally in the United Kingdom.  The Company issued
      approximately  9.6 million  shares of new common stock in exchange for the
      92.3% of AMV ordinary shares not already owned by the Company,  at a fixed
      exchange  ratio of .1347  common  shares of the Company  per AMV  ordinary
      share. The



                                       9


                       OMNICOM GROUP INC. AND SUBSIDIARIES
        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------

      transaction  was  accounted for under the  pooling-of-interests  method of
      accounting.  Accordingly,  the Company's  financial  statements  have been
      restated  to  include  the  operating  results  of  AMV  for  all  periods
      presented.

            For the three month period ended March 31, 1998, previously reported
      commissions and fees and net income for the company were  $860,976,000 and
      $50,903,000,   respectively.   The  amounts   presented  in  the  restated
      consolidated  condensed financial  statements reflect an increase from the
      previously  reported amounts of $44,823,000 to commissions and fees and an
      increase of $421,000 to net income.  These increases reflect the impact of
      including  the  operating  results of AMV for the three month period ended
      March 31, 1998, net of adjustments to eliminate inter-company transactions
      between  AMV and the  Company and  adjustments  to conform AMV  accounting
      methods to those used by the Company.

9)          On April 30, 1999, the Company entered into a $750 million revolving
      credit  agreement  with a consortium of banks  expiring on April 28, 2000.
      This revolving credit agreement includes a facility for issuing commercial
      paper.


                                       10


Item 2. MANAGEMENT'S DISCUSSION OF FINANCIAL CONDITION AND RESULTS OF 
                            OPERATIONS
- --------------------------------------------------------------------------------

         Results of Operations
         ---------------------

         First Quarter 1999 Compared to First Quarter 1998
         -------------------------------------------------

            Consolidated  worldwide  revenues  from  commission  and fee  income
      increased 26.6% in the first quarter of 1999 to $1,146.9  million compared
      to $905.8  million  in the first  quarter of 1998.  Consolidated  domestic
      revenues  increased  23.6% in the first quarter of 1999 to $587.2  million
      compared  to $475.2  million in the first  quarter  of 1998.  Consolidated
      international  revenues  increased  30.0% in the first  quarter of 1999 to
      $559.7  million  compared to $430.6  million in the first quarter of 1998.
      Absent the effect of acquisitions, net of divestitures  and changes in the
      foreign exchange value of the U.S. dollar, consolidated worldwide revenues
      increased  14.1% in the  first  quarter  of 1999 as  compared  to the same
      period in 1998.

            Worldwide operating expenses increased 25.9% in the first quarter of
      1999 as  compared  to the first  quarter  of 1998.  Absent  the  effect of
      acquisitions,  net of  divestitures  and changes in the  foreign  exchange
      value of the U.S.  dollar,  operating  expenses  increased 13.7% over 1998
      levels.  This  increase  reflects  normal  salary  increases and growth in
      client service expenditures to support the increased revenue base.

                                       11


 MANAGEMENT'S DISCUSSION OF FINANCIAL CONDITION AND RESULTS OF 
                            OPERATIONS (CONTINUED)
- --------------------------------------------------------------------------------

      
 
            Net interest expense  increased by $4.0 million in the first quarter
      of 1999 as compared to the same period in 1998.  This  increase  primarily
      reflects higher average borrowings during the period,  partially offset by
      the effect of higher  average  amounts of cash and  marketable  securities
      invested during the period.

            Pretax  profit  margin  was  10.8% in the first  quarter  of 1999 as
      compared  to 10.4% in the same  period in 1998.  Operating  margin,  which
      excludes interest and dividend income and interest  expense,  was 11.7% in
      the first quarter of 1999 as compared to 11.2% in the same period in 1998.

            The effective income tax rate was 41.0% in the first quarter of 1999
      as compared to 41.7% in the first quarter of 1998. This decrease primarily
      reflects a reduction in effective tax rates at the Company's international
      subsidiaries.

            The  decrease  in  equity  in   affiliates  is  the  result  of  the
      acquisition of additional  ownership  interests in certain affiliates that
      resulted in their consolidation in the March 31, 1999 financial statements
      and lower  profits  earned by certain  companies in which the Company owns
      less than a 50% equity interest.

            The increase in minority  interest  expense is primarily  due to new
      minorities  resulting from  acquisitions and


                                       12


 MANAGEMENT'S DISCUSSION OF FINANCIAL CONDITION AND RESULTS OF 
                            OPERATIONS (CONTINUED)
- --------------------------------------------------------------------------------

      greater earnings by companies where minority interests exist.

            Net income  increased 27.7% to $65.6 million in the first quarter of
      1999 as compared to $51.3  million in the same period in 1998.  Absent the
      effect of acquisitions,  net of  divestitures   and changes in the foreign
      exchange value of the U.S. dollar, net income increased 13.9% in the first
      quarter of 1999 as compared to the first quarter of 1998.

      Capital Resources and Liquidity
      -------------------------------

            Cash and cash  equivalents  at March 31,  1999  decreased  to $310.7
      million from $648.8 million at December 31, 1998. The relationship between
      payables to the media and suppliers and receivables from clients, at March
      31, 1999, is consistent with industry norms.

            The  Company  maintains   relationships   with  a  number  of  banks
      worldwide,  which have  extended  unsecured  committed  lines of credit in
      amounts  sufficient to meet the Company's  cash needs.  At March 31, 1999,
      the  Company  had $803.7  million  in such  unsecured  committed  lines of
      credit,  comprised of a $500.0 million revolving credit agreement expiring
      June 30, 2003, and $303.7 million in lines of credit,  principally outside
      of the United States. Of the $803.7 million in unsecured  committed lines,
      $183.7  million  remained  available at March 31, 1999.  Additionally,  on
      April


                                       13


 MANAGEMENT'S DISCUSSION OF FINANCIAL CONDITION AND RESULTS OF 
                            OPERATIONS (CONTINUED)
- --------------------------------------------------------------------------------

      30,  1999  the  Company  entered  into a  $750  million  revolving  credit
      agreement expiring on April 28, 2000.

            Management  believes the aggregate lines of credit  available to the
      Company  plus cash flows from  operations  will be adequate to support its
      anticipated requirements.

      Year 2000 Issue
      ---------------

            The Year 2000 issue is the result of computer programs being written
      using two  digits,  rather  than  four,  to define  the  applicable  year.
      Accordingly,  any of the  computer  programs  utilized by the Company that
      have date sensitive  software may cause system failures or miscalculations
      if data entry of "00" is recognized as a date other than 2000.

            The Company has developed a Year 2000 readiness plan to address Year
      2000 issues.  This plan has included the  establishment of Omnicom 2000, a
      special  purpose entity  dedicated to ensuring that Omnicom  companies are
      addressing  and  resolving  Year  2000  compliance  issues.  Omnicom  2000
      comprises an Executive Committee of senior executives from Omnicom and its
      principal  subsidiaries,  and a team of  dedicated  internal  managers and
      consultants.   Omnicom  2000  has  also  retained  external  managers  and
      consultants  to assist in project  management  and  quality  control.  The
      Company's  plan  includes  an  assessment   phase,  a  testing  phase,  an
      implementation phase and a contingency planning


                                       14


 MANAGEMENT'S DISCUSSION OF FINANCIAL CONDITION AND RESULTS OF 
                            OPERATIONS (CONTINUED)
- --------------------------------------------------------------------------------

      phase.  Additionally,  the Audit Committee of the Board of Directors meets
      periodically to review progress against the plan.

            As part of its  assessment  phase,  the Company  compiled a detailed
      inventory of systems and potential  Year 2000  readiness  issues at all of
      its principal locations. Based on this information, the Company determined
      that it is  required  to  modify  portions  of its  software  so that  its
      computer  systems will properly utilize dates beyond December 31, 1999. In
      addition,  the Company is dependent on  third-party  computer  systems and
      applications,  particularly  with  respect  to such  tasks as  accounting,
      billing,  buying and planning and paying for media.  The Company is in the
      process of modifying or replacing affected systems, and is also evaluating
      the  adequacy of the  processes  and  progress of  third-party  vendors of
      systems that may be affected by the Year 2000 issue.  The Company believes
      that it has  identified  critical  third-party  vendors,  and it  recently
      completed its testing of these  critical  vendors to determine  their Year
      2000  readiness.  The Company has been working  with and will  continue to
      work with  these and other  vendors  and  believes  they will be Year 2000
      compliant.

            The Company has completed the assessment phase and believes that the
      implementation phase of its Year 2000 readiness plan will be substantially
      completed by the middle


                                       15


 MANAGEMENT'S DISCUSSION OF FINANCIAL CONDITION AND RESULTS OF 
                            OPERATIONS (CONTINUED)
- --------------------------------------------------------------------------------

      of 1999. Contingency planning will continue throughout 1999.

            The Company  believes that,  through  upgrades,  modifications,  and
      replacement of its existing hardware, software and non-IT systems, it will
      achieve Year 2000 readiness. However, if such upgrades,  modifications and
      replacements  are not made, or are not made in a timely  manner,  the Year
      2000 issue could have a material impact on the Company's operations.

            The  out-of-pocket  costs  incurred in the first quarter of 1999 for
      its Year  2000  program  were not  material  to  consolidated  results  of
      operations  and are expected to be immaterial  for the year ended December
      31, 1999.  These costs,  the majority of which will not be  capitalizable,
      include third party  consultants  and the  replacement  and remediation of
      existing  computer  software  and  hardware.  Such  costs  do not  include
      internal management time, the effects of which are also not expected to be
      material to the Company's  results of  operations or financial  condition.
      The Company will continue to refine its estimates of the costs of its Year
      2000 efforts through  progress  reports from each location and through its
      capital expenditure budget review process.

            At this  stage  of the  process,  the  Company  believes  that it is
      difficult to specifically  identify the cause of the


                                       16


 MANAGEMENT'S DISCUSSION OF FINANCIAL CONDITION AND RESULTS OF 
                            OPERATIONS (CONTINUED)
- --------------------------------------------------------------------------------

      most reasonable  worst case Year 2000 scenario.  Due to the  decentralized
      nature of the Company's structure and systems, the Company believes that a
      reasonable  worst case scenario  could involve the failures of significant
      third  parties  (including  entities  with which the Company has no direct
      involvement  such as  telecommunications  companies and public  utilities)
      that continue for more than several days and affect a  significant  number
      of the Company's operating  locations.  The Company is considering various
      contingency  planning  approaches  in the  event of such  failures  and is
      currently developing a plan for its operations to follow in the event of a
      Year 2000 failure. The development of the Company's contingency plans will
      be ongoing and will reflect  additional  information  with regard to third
      parties' Year 2000 readiness as it is received.

            The Company's Year 2000 efforts are ongoing and its overall plan, as
      well as the consideration of contingency plans, will continue to evolve as
      new  information   becomes  available.   While  the  Company   anticipates
      continuity of its business  activities,  that continuity will be dependent
      upon its ability,  and the ability of third  parties with whom the Company
      relies on directly, or indirectly, to be Year 2000 compliant.


                                       17


 Item 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
- --------------------------------------------------------------------------------

      Market Risk
      -----------

            The  Company's  market  risks  primarily  consist  of the  impact of
      changes in currency  exchange rates on assets and  liabilities of non-U.S.
      operations and the impact of changes in interest rates on debt.

            The Company's 1998 Form 10-K provides a more detailed  discussion of
      the market  risks  affecting  its  operations.  As of March 31,  1999,  no
      material change has occurred in the Company's market risks, as compared to
      the disclosure in its Form 10-K for the year ending December 31, 1998.


                                       18



      Forward-Looking Statements
      --------------------------

            "Management's  Discussion  of  Financial  Condition  and  Results of
      Operations" and  "Quantitative  and Qualitative  Disclosures  About Market
      Risk"  set  forth  in  this   report   contain    disclosures   which  are
      forward-looking   statements.   Forward-looking   statements  include  all
      statements  that do not relate solely to historical or current facts,  and
      can be  identified  by the use of words such as "may,"  "will,"  "expect,"
      "project,"  "estimate,"  "anticipate,"  "envisage,"  "plan" or "continue."
      These  forward-looking  statements  are based upon the  Company's  current
      plans or  expectations  and are subject to a number of  uncertainties  and
      risks  that  could  significantly  affect  current  plans and  anticipated
      actions and the Company's  future  financial  condition  and results.  The
      uncertainties and risks include,  but are not limited to, general economic
      and business conditions; loss of significant customers;  changes in levels
      of client  advertising;  the  impact of  competition;  risks  relating  to
      acquisition activities; the complexity of integrated computer systems; and
      the success and expense of the  remediation  efforts of the  Company,  its
      subsidiaries  and third parties in achieving  Year 2000  compliance.  As a
      consequence,  current  plans,  anticipated  actions  and future  financial
      condition   and   results  may  

                                       19


      differ from those expressed in any  forward-looking  statements made by or
      on behalf of the Company. 

SIGNATURES:
- -----------

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.


                                                           Omnicom Group Inc.
                                                              (Registrant)
                                                           ------------------


Date: May 17, 1999                              /s/  Randall J. Weisenburger
      ------------                              ----------------------------
                                                    Randall J. Weisenburger
                                                    Chief Financial Officer
                                                   (Principal Financial Officer)



Date: May 17, 1999                              /s/  Philip J. Angelastro
      ------------                              -------------------------
                                                     Philip J. Angelastro
                                                     Controller
                                                    (Chief Accounting
                                                     Officer)


                                       20



                           PART II. OTHER INFORMATION

         Item 6. Exhibits and Reports on Form 8-K

(a) Exhibits

         Exhibit Number                     Description of Exhibit
         --------------                     ----------------------

         10.1                           364-Day  Credit  Agreement,  dated as of
                                        April 30,  1999, among  Omnicom  Finance
                                        Inc.,   Omnicom  Finance  Limited,   the
                                        financial   institutions party  thereto,
                                        Citibank, N.A., as Administrative Agent,
                                        The    Bank   of   Nova    Scotia,    as
                                        Documentation    Agent,   and   Istituto
                                        Bancario  San Paolo Di  Torino  Istituto
                                        Mobiliare     Italiano    S.p.A.,     as
                                        Syndication     Agent    (the    "Credit
                                        Agreement").

         10.2                           List  of  Contents  of  Exhibits  to the
                                        Credit Agreement.

         10.3                           Guaranty,  dated  as of April  30, 1999,
                                        made by Omnicom Group Inc.

         27                             Financial   Data   Schedule   (filed  in
                                        electronic format only)

(b) Reports on Form 8-K

         No reports on Form 8-K were filed during the first quarter of 1999.


                                       21