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, 2000
                                        --------------
                                       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 Number)

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.  177,644,800 (as of April 30,
2000)



PART I. FINANCIAL INFORMATION

                                                                        Page No.
                                                                        --------
  Item 1.  Financial Statements

           Consolidated Condensed Balance Sheets -
             March 31, 2000 and December 31, 1999                          1

           Consolidated Condensed Statements of Income -
             Three Months Ended March 31, 2000 and 1999                    2

           Consolidated Condensed Statements of Cash Flows -
             Three Months Ended March 31, 2000 and 1999                    3

           Notes to Consolidated Condensed Financial Statements            4

  Item 2.  Management's Discussion and Analysis of Financial
             Condition and Results of Operations                           7

  Item 3.  Quantitative and Qualitative Disclosures About Market Risk      8

PART II.   OTHER INFORMATION

  Item 6.  Exhibits and Reports on Form 8-K                                9

           Signatures                                                     10


                       OMNICOM GROUP INC. AND SUBSIDIARIES
                      CONSOLIDATED CONDENSED BALANCE SHEETS
                             (Dollars in Thousands)



                                                                     (unaudited)
                                                                       March 31,    December 31,
                                                                         2000          1999
                                                                         ----          ----
                                      Assets
                                      ------
                                                                               
Current assets:
    Cash and cash equivalents ...................................    $  353,462     $  576,427
    Short-term investments at market, which approximates cost ...        39,421         24,522
    Accounts receivable, less allowance for doubtful accounts
       of $50,435 and $53,720 ...................................     3,163,812      3,358,304
    Billable production orders in process, at cost ..............       398,510        299,209
    Prepaid expenses and other current assets ...................       565,031        453,862
                                                                     ----------     ----------
           Total Current Assets .................................     4,520,236      4,712,324

    Furniture, equipment and leasehold improvements at cost, less
       accumulated depreciation and amortization of $542,911,
       and $522,254 .............................................       448,573        444,722
    Investments in affiliates ...................................       360,711        369,311
    Intangibles, less amortization of $363,377 and $352,081 .....     2,491,103      2,428,385
    Deferred tax benefits .......................................        81,934        120,346

    Long-term investments, at market.............................       669,521        802,644
    Deferred charges and other assets ...........................       231,168        139,905
                                                                     ----------     ----------
           Total Assets .........................................    $8,803,246     $9,017,637
                                                                     ==========     ==========

                       Liabilities and Shareholders' Equity
                       ------------------------------------

Current liabilities:
    Accounts payable ............................................    $3,182,275     $4,112,777
    Advance billings ............................................       431,180        417,044
    Bank loans ..................................................       261,685        130,369
    Accrued taxes and other liabilities..........................     1,176,020      1,317,732
    Dividends payable ...........................................        31,103         31,141
                                                                     ----------     ----------
         Total Current Liabilities ..............................     5,082,263      6,009,063
                                                                     ----------     ----------

Long-term debt ..................................................     1,101,728        263,149
Convertible subordinated debentures .............................       448,419        448,483
Deferred compensation and other liabilities .....................       311,121        300,746
Deferred income taxes on unrealized gains .......................       237,294        320,176
Minority interests ..............................................       121,357        123,122

Shareholders' equity:
    Common stock ................................................        93,543         93,543
    Additional paid-in capital ..................................       807,776        808,154
    Retained earnings ...........................................       995,084        882,051
    Unamortized restricted stock ................................       (78,103)       (85,919)
    Accumulated other comprehensive income ......................       181,737        285,234
    Treasury stock ..............................................      (498,973)      (430,165)
                                                                     ----------     ----------
         Total Shareholders' Equity .............................     1,501,064      1,552,898
                                                                     ----------     ----------
         Total Liabilities and Shareholders' Equity .............    $8,803,246     $9,017,637
                                                                     ==========     ==========


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


                                       1



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


                                                   Three Months Ended March 31,
                                                       2000            1999
                                                       ----            ----

Commissions and fees ........................      $1,379,015     $1,146,877

Operating expenses:
    Salaries and related costs ..............         838,867       688,301
    Office and general expenses .............         376,461        324,006
                                                   ----------     ----------
                                                    1,215,328      1,012,307
                                                   ----------     ----------
Operating profit ............................         163,687        134,570

Gain on sale of Razorfish shares ............         110,044             --

Net interest expense:
    Interest and dividend income ............          (7,274)        (7,225)
    Interest paid or accrued ................          18,595         18,472
                                                   ----------     ----------
                                                       11,321         11,247
                                                   ----------     ----------
Income before income taxes ..................         262,410        123,323

Income taxes ................................         108,469         50,515
                                                   ----------     ----------

Income after income taxes ...................         153,941         72,808
Equity in affiliates ........................             876            929
Minority interests ..........................         (11,279)        (8,175)
                                                   ----------     ----------
      Net income ............................      $  143,538     $   65,562
                                                   ==========     ==========
Net Income Per Common Share:

Net income:
    Basic ...................................           $0.82          $0.37
    Diluted .................................           $0.78          $0.37

Dividends declared per common share .........          $0.175          $0.15

     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 CASH FLOWS
                             (Dollars in Thousands)
                                  (unaudited)



                                                                                Three Months Ended March 31,
                                                                                     2000          1999
                                                                                     ----          ----
                                                                                          
Cash flows from operating activities:
    Net income ...............................................................    $ 143,538     $  65,562
    Adjustments to reconcile net income to net cash
       used for operating activities:
    Gain on sale of long-term investments ....................................     (110,044)          --
    Depreciation and amortization of tangible assets .........................       25,339        22,889
    Amortization of intangible assets ........................................       19,832        16,849
    Minority interests .......................................................       11,279         8,175
    Earnings of affiliates less than dividends received ......................          794           945
    Decrease in deferred tax benefits ........................................        1,759         1,065
    Provision for losses on accounts receivable ..............................        2,341         2,344
    Amortization of restricted stock .........................................        7,465         5,273
    Decrease (increase) in accounts receivable ...............................      171,051      (140,594)
    Increase in billable production orders in process ........................     (102,949)      (20,605)
    Increase in prepaid expenses and other current assets ....................     (113,490)      (39,394)
    Decrease in accounts payable .............................................     (882,291)     (465,440)
    Decrease in other accrued liabilities ....................................     (159,401)     (114,084)
    Increase in accrued taxes on income ......................................       36,943        10,211
    Decrease in advances to affiliates .......................................       40,916        21,019
    Other increases (decreases)...............................................        4,671       (19,300)
                                                                                  ---------     ---------
       Net cash used for operating activities ................................     (902,247)     (645,085)
                                                                                  ---------     ---------

Cash flows from investing activities:
    Capital expenditures .....................................................      (33,089)      (27,163)
    Payments for purchases of equity interests in subsidiaries and affiliates,
       net of cash acquired ..................................................     (129,065)     (108,409)
    Proceeds from sales of equity interests in subsidiaries and affiliates ...        6,017           634
    Payments for purchases of long-term investments and other assets .........     (132,602)      (21,278)
    Proceeds from sales of long-term investments and other assets ............      145,628        37,518
                                                                                  ---------     ---------
       Net cash used for investing activities ................................     (143,111)     (118,698)
                                                                                  ---------     ---------

Cash flows from financing activities:
    Net borrowings under lines of credit .....................................      192,527       109,117
    Share transactions under employee stock plans ............................       17,328        13,484

    Proceeds from issuance of debt obligations ...............................      934,336       476,778
    Repayments of principal of debt obligations ..............................     (146,019)      (59,345)
    Dividends and loans to affiliates and minority shareholders ..............      (55,112)      (16,473)
    Dividends paid ...........................................................      (30,677)      (25,069)
    Purchase of treasury shares ..............................................      (86,270)      (72,524)
                                                                                  ---------     ---------
       Net cash provided by financing activities .............................      826,113       425,968
                                                                                  ---------     ---------

Effect of exchange rate changes on cash and cash equivalents .................       (3,720)         (293)
                                                                                  ---------     ---------
       Net decrease in cash and cash equivalents .............................     (222,965)     (338,108)
Cash and cash equivalents at beginning of period .............................      576,427       648,781
                                                                                  ---------     ---------
Cash and cash equivalents at end of period ...................................    $ 353,462     $ 310,673
                                                                                  =========     =========

Supplemental Disclosures:
   Income taxes paid .........................................................    $  65,622     $  35,205
                                                                                  =========     =========
   Interest paid .............................................................    $  18,092     $  19,191
                                                                                  =========     =========


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


                                       3


                      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.

2.          These  statements  reflect all  adjustments,  consisting of normally
      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, 1999 and  December  31,
      1999   reported   amounts  to  conform   them  with  the  March  31,  2000
      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, 1999.

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

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, 2000 and 1999,
      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, 2000 and 1999,  respectively,  177,484,000 and 178,357,000
      common  share   equivalents   were  assumed  to  have  been   outstanding.
      Additionally,  11,552,000 and 6,936,000 shares,  respectively were assumed
      to have been converted  related to the Debentures and the assumed increase
      in net income  used in the  computation  was  $4,441,000  and  $2,385,000,
      respectively.  The number of shares used in the  computations of basic and
      diluted earnings per share were as follows:

                                                Three Months
                                               Ended March 31,
                                               --------------
                                           2000               1999
                                           ----               ----
                Basic EPS              174,669,000        175,329,000
                Diluted EPS            189,036,000        185,293,000

            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 antidilutive.


                                       4



              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS

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



                                                                  Three Months Ended
                                                                        March 31,
                                                                      ($ in 000's)
                                                               --------------------------
                                                                   2000         1999
                                                                   ----         ----
                                                                        
             Net income for the period                           $143,538     $ 65,562

             Unrealized loss on Long-Term
             Investments, net of income taxes of $8,910           (12,910)        --

             Reclassification to realized gain on sale of
             Razorfish shares, net of income taxes of $46,218     (63,826)        --

             Foreign currency translation adjustment,
             net of income taxes of $18,596 and
             $16,937 in 2000 and 1999, respectively               (26,761)     (24,373)
                                                                 --------     --------

             Comprehensive income for the period                 $ 40,041     $ 41,189
                                                                 ========     ========


            During the three month period ended March 31, 2000, the Company sold
      a portion of its  ownership  interest in  Razorfish  Inc.  and  realized a
      pre-tax gain of approximately $110 million. Included in net income for the
      period is $63,826,000 related to this transaction and comprehensive income
      for the period has been  adjusted to reflect the  reclassification  of the
      gain from unrealized to realized.

            During the period certain interactive  marketing agencies,  in which
      the Company holds an ownership interest in, filed initial public offerings
      of their equity securities. Accordingly, the Company adjusted the carrying
      value of these  holdings to reflect  market value as of March 31, 2000 and
      recorded  an  unrealized  pre-tax  gain of $284  million in  comprehensive
      income.  These  investments  are included in Long-Term  Investments on the
      accompanying March 31, 2000 balance sheet.

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, 2001. 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 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.


                                       5


                     OMNICOM GROUP INC. AND SUBSISIDIARIES
        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (Continued)

            The Company intends to adopt SFAS No. 133 for its fiscal year ending
      December 31, 2001.  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.

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, 2000 and 1999,  and for the
      three months then ended is presented below:



                                                                      Dollars in Thousands
                                   -----------------------------------------------------------------------------------
                                   United     United                              Other        Other
                                   States     Kingdom    Germany     France      Europe    International  Consolidated
                                                                                      
    2000
    Commissions and Fees         $717,378    $188,902   $100,677    $89,037    $130,688      $152,333     $1,379,015
    Long-Lived Assets             225,809     102,393     10,259     16,599      34,447        59,066        444,464

    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



8.          On   April  27,  2000,  the   Company   extended  its  $750  million
      revolving credit facility ("the Facility"). The Facility was renewed under
      the same terms with an  additional  provision  which allows the Company to
      convert  all amounts  outstanding  under the  Facility to a one-year  term
      loan.  The  Facility,  which allows for the issuance of  commercial  paper
      expires on April 26, 2001. In addition to the $750 million credit facility
      the Company has a $500 million 5-year revolving credit facility  available
      which also allows for  the  issuance  of  commercial paper  and expires on
      June 30, 2003.

            Amounts  borrowed or issued under the  Facilities  at March 31, 2000
      include commercial paper, which amounted to $622.7 million, and bank loans
      of $200 million,  were  classified as long-term  debt.  Amounts  available
      under both credit facilities at March 31, 2000 were $427.3 million.


                                       6



ITEM 2. MANAGEMENT'S  DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
        OF OPERATIONS

Results of Operations

First Quarter 2000 Compared to First Quarter 1999

      Consolidated  worldwide  revenues from commission and fee income increased
20.2% in the first  quarter of 2000 to  $1,379.0  million  compared  to $1,146.9
million in the first quarter of 1999.  Consolidated  domestic revenues increased
22.2% in the first quarter of 2000 to $717.4 million  compared to $587.2 million
in the first  quarter of 1999.  Consolidated  international  revenues  increased
18.2% in the first quarter of 2000 to $661.6 million  compared to $559.7 million
in the first quarter of 1999. The effect of  acquisitions,  net of  divestitures
increased  worldwide  revenues by 9.2% and changes in the foreign exchange value
of the U.S.  dollar  decreased  worldwide revenues by 3.8%. The remaining  14.8%
increase in  consolidated  worldwide  revenues was due to the growth of existing
businesses, including net new business wins.

      Worldwide  operating  expenses,  including net interest expense  increased
19.8% in the first quarter of 2000 compared to in the first quarter of 1999. The
effect of  acquisitions,  net of  divestitures,  increased  worldwide  operating
expenses by 9.2% and changes in the foreign  exchange  value of the U.S.  dollar
decreased  worldwide operating expenses by 3.7%. The remaining increase of 14.3%
reflects normal salary  increases and growth in client services  expenditures to
support the increased revenue base.

      Net interest  expense  increased  slightly in the first quarter of 2000 to
$11.3  million as  compared to $11.2  million in the same  period in 1999.  This
reflected higher average interest rates during the period,  substantially offset
by the  effect of  higher  average  amounts  of cash and  marketable  securities
invested during the period.

      Excluding the gain on sale of Razorfish  shares,  pretax profit margin was
11.0% in the first  quarter of 2000 as  compared  to 10.8% in the same period in
1999 and  operating  margin,  which  excludes  interest and dividend  income and
interest expense, was 11.9% in the first quarter of 2000 as compared to 11.7% in
the same period in 1999.

      The  effective  income tax rate was 41.3% in the first  quarter of 2000 as
compared to 41.0% in the first quarter of 1999. This increase is due principally
to the impact of the gain on sale of Razorfish shares which resulted in a higher
marginal tax rate.

      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,  2000  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 acquisitions
and greater earnings by companies where minority interests exist.

      Including  the gain on sale of  Razorfish  shares,  net  income  increased
118.9% to $143.5  million and diluted  earnings  per share  increased  110.8% to
$0.78 in the first quarter of 2000.  Excluding this gain,  net income  increased
21.6% to $79.7 million in the first quarter of 2000 as


                                       7


compared to $65.6  million in the same period in 1999 and diluted  earnings  per
share increased  21.6% to $0.45 in the current quarter  compared to $0.37 in the
prior year period.

Capital Resources and Liquidity

      Cash and cash  equivalents  at March 31, 2000  decreased to $353.5 million
from $576.4 million at December 31, 1999. The  relationship  between payables to
the media and suppliers  and  receivables  from  clients,  at March 31, 2000, is
consistent with industry norms.

      On April 27, 2000 the Company  renewed its $750 million  revolving  credit
facility  (the  "Facility").  The  Facility,  which  allows for the  issuance of
commercial paper, was renewed under the same terms, with an additional provision
that allows the Company to convert all amounts  outstanding at expiration of the
Facility on April 26, 2001, into a one-year term loan.

      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, 2000, the Company had $1,705 million
in such  unsecured  committed  lines  of  credit,  including  the  $750  million
revolving  credit  facility  renewed  April 27, 2000,  of which $564 million was
available.

      Management believes the aggregate lines of credit available to the Company
and cash flow from operations provide the Company with sufficient  liquidity and
are adequate to support foreseeable operating requirements.

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  1999 Form 10-K  provides a more detailed  discussion of the
market risks affecting its operations.  As of March 31, 2000, no material change
had occurred in the Company's market risks, as compared to the disclosure in its
Form 10-K for the year ending December 31, 1999.

Forward-Looking Statements

      "Management's  Discussion and Analysis 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 no 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; and the complexity of integrated computer systems. As a consequence,
current plans,  anticipated  actions and future financial  condition and results
may differ from those expressed in any forward-looking  statements made by or on
behalf of the Company.


                                       8


PART II. OTHER INFORMATION

Item 6. Exhibit 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,
                      amended  and   restated  April  27,  2000, among  Omnicom
                      Finance  Inc.,   Omnicom     Finance PLC,  Omnicom Capital
                      Inc.,   the    financial   institutions   party   thereto,
                      Citibank,  N.A., as  Administrative   Agent,  The  Bank of
                      Nova Scotia,  as Documentation  Agent, and San   Paolo IMI
                      SPA, as Syndication Agent.

     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 2000.


                                       9


                                   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 15, 2000                         /s/ Randall J. Weisenburger
         ------------                         ----------------------------------
                                                  Randall J. Weisenburger
                                                  Executive Vice President and
                                                  Chief Financial Officer
                                                  (Principal Financial Officer)

Date     May 15, 2000                         /s/ Philip J. Angelastro
         ------------                         ----------------------------------
                                                  Philip J. Angelastro
                                                  Controller
                                                  (Chief Accounting Officer)

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