SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    ________

                                    FORM 6-K

                        REPORT OF FOREIGN PRIVATE ISSUER
                      PURSUANT TO RULE 13a-16 OR 15d-16 OF
                       THE SECURITIES EXCHANGE ACT OF 1934

                          For the month of April, 2003

                                  Serono S.A.
                      -----------------------------------
                              (Registrant's Name)

                            15 bis, Chemin des Mines
                                Case Postale 54
                                CH-1211 Geneva 20
                                  Switzerland
                      -----------------------------------
                    (Address of Principal Executive Offices)

                                    1-15096
                      -----------------------------------
                              (Commission File No.)

     (Indicate by check mark whether the registrant files or will file annual
reports under cover of Form 20-F or Form 40-F.)

     Form 20-F  X    Form 40-F
               ---             ---

     (Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101 (b)(1).)
                                                       ---

     (Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101 (b)(7).)
                                                       ---

     (Indicate by check mark whether the registrant by furnishing the
information contained in this form is also thereby furnishing the information to
the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934.)

     Yes       No  X
         ---      ---

     (If "Yes" is marked, indicate below the file number assigned to the
registrant in connection with Rule 12g3-2(b): 82-______)



                                                                          Serono
                                                               [GRAPHIC OMITTED]


Media  Release

FOR  IMMEDIATE  RELEASE
-----------------------



                   SERONO ANNOUNCES GOOD FIRST QUARTER RESULTS
                           WITH STRONG REVENUE GROWTH

          - Rebif(R) sales of $175.2m and Gonal-F(R) sales of $122.0m -
      - Raptiva(TM) filed for psoriasis in the EU, Switzerland and Canada -


GENEVA,  SWITZERLAND,  APRIL  24, 2003 - Serono S.A. (virt-x: SEO and NYSE: SRA)
today  reported  its  first quarter results for the period ended March 31, 2003.

HIGHLIGHTS

-    Total revenues of $442.4m up 29.4% in dollars and 17.3% in local currencies

-    Product sales up 30.1% to $407.8m

-    Strong Rebif(R) growth of 52.0% to $175.2m

-    Gonal-F(R) up 20.5% to $122.0m

-    Solid underlying net income growth of 16.8% excluding a $25m milestone
     payment related to the filing of Raptiva(TM) in the EU

-    Reported net income of $60.2m

-    On track to meet 2003 outlook of total revenue growth of 15% to 20% and net
     income growth of 15% to 20% on a reported basis


"Our  first  quarter  performance has been very strong with substantial top-line
growth  driven  by  sales  in  Neurology  and Reproductive Health," said Ernesto
Bertarelli, Chief Executive Officer of Serono.  "Our first-quarter net income is
in line with our expectations, which included a milestone payment related to the
filing  of  Raptiva(TM)  in  Europe."

"We  are confident of our ability to meet full-year revenue growth of 15% to 20%
and net income growth of 15% to 20% on a reported basis," said Allan Shaw, Chief
Financial  Officer.  "The  positive  currency  effect  on  sales was offset by a
corresponding  increase  in  total operating expenses, which resulted in a small
favorable currency impact of $1.2m on the bottom line reflecting the significant
natural  hedge  provided  by  our  global  operations."


                                     -more-

FINANCIAL  PERFORMANCE

In  the  first  quarter  of  2003  total  revenues increased by 29.4% to $442.4m
(Q1  2002:  $341.9m).   Worldwide  product  sales  advanced  30.1%  to  $407.8m
(Q1  2002:  $313.5m).  Product  sales growth in local currency was 17.6%.  There
was  a  favorable  currency  effect of $39.1 million on product sales due to the
relative  weakness  of  the  dollar  compared  with  the  first quarter of 2002.

Royalty  and  licensing  income  rose  22.1%  to $34.6m (Q1 2002: $28.4m).  This
included  a  license  fee from Abbott following the first regulatory approval of
Humira(R)  as  well  as  the  commencement  of  royalty payments on Humira(R) in
relation  to  our  intellectual  property  rights in the area of TNF antagonism.

Our  gross margin has increased to 84.6% of product sales (Q1 2002: 83.8%), as a
result  of  the  continued  rise in the proportion of recombinant product sales,
which  accounted  for  90.2% of total product sales in the first quarter of 2003
(Q1  2002:  85.6%).

Selling,  general  and  administrative  expenses  were $140.9m or 31.9% of total
revenues  (Q1  2002:  $116.3m  or  34.0%  of total revenues).  This increase was
primarily driven by investments we made in our neurology infrastructure over the
past  year in the USA and selling expenses related to the promotion of Rebif(R),
as  well  as  the  launch  of  a  new  presentation  of  Gonal-F(R)  in  Europe.

Research and development expenses reached $127.9m or 28.9% of total revenues (Q1
2002:  $75.6m  or  22.1%  of  total  revenues).  As  anticipated, this temporary
increase reflects primarily a $25m milestone payment to Genentech as a result of
the  filing  of  Raptiva(TM)  in  the  EU.  In this quarter we also extended the
Raptiva(TM)  agreement,  providing  Serono  with worldwide rights to develop and
market  Raptiva(TM)  outside  of  the  United  States  and  Japan.

Other  operating  expenses  increased  to  $45.8m (Q1 2002: $19.4m), principally
reflecting  predetermined  quarterly  licensing  fees to Amgen for the marketing
rights  of  Novantrone(R).  Novantrone(R),  a  commercial  product  protected by
orphan drug status, is strategic for our neurology franchise in the USA as it is
complementary  to  Rebif(R)  and  allows  us to leverage investments made in our
neurology  infrastructure.  The  increase  in  other  operating  expenses  also
includes  higher  amortization  of  goodwill.

Net  financial income was $8.4m in the first quarter (Q1 2002: $4.6m) reflecting
the  continued  low  interest  environment.

Total  taxes  in the first quarter were $11.5m, representing an overall tax rate
of  16.0% of profit before tax (Q1 2002: $14.2m, or 17.0% of profit before tax).

Reported  net  income  was 13.4% less than last year at $60.2m (Q1 2002: $69.5m)
reflecting  the  temporary  increase  in  R&D  expenses  in  the  first quarter.
Excluding  the  $25m  milestone  payment,  our  underlying net income was $81.2m
representing  growth  of  16.8%.


                                     -more-

Foreign exchange fluctuations have increased the reported US dollar value of our
revenues and also raised our expenses in terms of US dollars.  The net impact of
translation  of  currency  on  our  operating  results was only $1.2m, or a 2.0%
positive  effect  on  reported  net  income.  The  company's  currency exposures
principally  continue  to be hedged by the broad geographic nature of our global
operations.

Basic earnings per share (EPS) for the first quarter were $3.80 per bearer share
(Q1 2002: $4.32) and $0.09 per American Depositary Share (ADS) (Q1 2002: $0.11).
Excluding the $25m milestone payment to Genentech in the first quarter, EPS were
$5.12  per  bearer  share  and  $0.13  per  ADS.

For  the first quarter, net cash flow from operating activities was up 156.4% to
$115.2m,  compared to $44.9m for Q1 2002.  This includes a $55m payment received
from  OSI  Pharmaceuticals, following the agreement by which OSI will market and
promote  Novantrone(R)  for  the  approved  oncology  indications  in the United
States.

As  of  March  31, 2003, we have bought back 281,995 of our bearer shares on the
open  market,  representing  41.2%  of  the  CHF500m  authorized  amount.

The  weighted  average  amount  of  equivalent bearer shares outstanding for the
three  months  ended  March  31,  2003  was  15,849,191.

NEUROLOGY

Rebif(R) performed very strongly with worldwide sales up 52.0% to $175.2m in the
first  quarter  (Q1  2002:  $115.3m).  Rebif(R)  continues its market leadership
outside  the  US.  In  Europe,  sales grew by 37.6% to $98.3m (Q1 2002: $71.4m).

Since  launch  in  the  United  States in March 2002, Rebif(R) sales have broken
through  the  $100m  mark,  and at the end of March 2003, our US market share in
dollar  terms is estimated to be 11%.  US sales were $40.3m in the first quarter
of  2003  (Q1  2002:  $6.2m).  Underlying  demand  was strong with prescriptions
growing  at  25.4%  between  the fourth quarter of 2002 and the first quarter of
2003.

Quarterly  sales  of  Novantrone(R)  were  $12.8m  in  the  USA  for both MS and
oncology.  In  the first quarter, we took over the marketing of Novantrone(R) in
MS  and  we  recently  commenced  our  own  promotional  activities.  During the
quarter,  we  signed  an  agreement  with OSI Pharmaceuticals by which they will
market  and  promote  Novantrone(R)  in  oncology  allowing  us  to focus on the
marketing  of  this  product  in  MS.

REPRODUCTIVE  HEALTH

In  the  first  quarter,  we  strengthened our market leadership in reproductive
health  with  product  sales  increasing  by 13.7% to $160.6m (Q1 2002: $141.3m)
while  continuing  the  phase-out  of our urine-derived products.  In Europe, we
introduced  a new multidose presentation of Gonal-F(R) providing physicians with
more  dosing  flexibility  and optimal product consistency.  Sales of Gonal-F(R)
increased  by 20.5% to $122.0m (Q1 2002: $101.2m).  Recombinant product sales in
this  franchise  grew by 22.2%, and accounted for 85.3% of Serono's gonadotropin
sales.


                                     -more-

GROWTH  AND  METABOLISM

In the first quarter, sales of Serono's recombinant growth hormone products rose
by  7.4%  to  $53.0m  (Q1  2002: $49.4m).  Saizen(R) sales increased by 12.3% to
$33.1m (Q1 2002: $29.5m).  The launch of our needle-free device, cool.click(TM),
across Europe contributed to this growth.  Serostim(R) sales were flat at $19.9m
reflecting  the  rollout  of the Serostim(R) Secured Distribution Program across
the  USA  allowing  us  to  stabilize  reimbursement  in  the  major  states.

REGIONAL  SALES

Sales  in  North  America  were  very  strong, growing at 56.6% to reach $149.2m
(Q1  2002:  $95.3m).  European  sales  were  also strong, increasing by 31.2% to
$185.6m  (Q1  2002:  $141.5m),  and sales in the Middle East, Africa and Eastern
Europe  were  up  30.4% to $33.0m (Q1 2002: $25.3m).  Sales in Japan and Oceania
were stable at $11.5m (Q1 2002: $10.8m), as were sales in Asia Pacific at $13.0m
(Q1  2002:  $13.8m).  Economic  and  market  conditions  in  Latin  America were
reflected  in  first  quarter  sales which declined to $15.5m (Q1 2002: $26.9m);
notwithstanding  these  conditions,  we maintained our leadership position in MS
and  reproductive  health  in  this  region.

R&D  NEWS

In  February, we submitted a Marketing Authorization Application to the EMEA for
Raptiva(TM)  (efalizumab)  in  moderate-to-severe  psoriasis  and  we also filed
applications  with  Swiss  and  Canadian  authorities.  During  the  quarter, we
announced  the  extension  of  Serono's  exclusive license to develop and market
Raptiva(TM)  in  Asia. As a result of the new agreement, Serono will now develop
and  market  Raptiva(TM)  worldwide  outside  of  the  United  States and Japan.

At  the  recent  American  Association  of  Dermatology  (AAD)  meeting  in  San
Francisco,  results  were presented from the latest Phase 3 study of Raptiva(TM)
that  showed  consistent,  strong  efficacy  and  safety  data.  The preliminary
long-term  data  from  another  study demonstrated that approximately 65% of the
patients  who  continued treatment with Raptiva(TM) through 60 weeks, achieved a
75%  or  greater  improvement  in  PASI  scores  (PASI  75).  These  data  also
demonstrated  persistent  efficacy of Raptiva(TM) when administered continuously
on  a  weekly  basis.

These  efficacy  results  together with Raptiva(TM)'s rapid onset of action, its
subcutaneous  administration  and  its safety profile, mean that Raptiva(TM) has
significant  potential  as  a  once-weekly  continuous  treatment  for
moderate-to-severe  psoriasis.  The  on-going  Phase  2  study of Raptiva(TM) in
Rheumatoid Arthritis has completed enrollment and the Phase 2 study in Psoriatic
Arthritis  has  recently  begun  enrollment.

We  initiated  a  Phase  2 trial with anastrozole for follicular development and
ovulation  in  infertile women with ovulatory dysfunction.  A phase 1 study with
our B-sheet  breaker  peptide, a potential treatment of Alzheimer's disease, has
also  been  initiated  in  healthy  volunteers.


                                     -more-

CONFERENCE  CALL  AND  WEBCAST

Serono  will  hold  a conference call today, April 24, 2003, starting at 3.00 pm
Central European Time (9.00 am U.S. Eastern Time) during which Serono Management
will  present  the  Company's  First Quarter 2003 Results. To join the telephone
conference  please dial 091 610 5600 (from Switzerland), 0207 866 4111 (from the
UK),  +1  412  858  4600  (from  the  USA) and +41 91 610 5600 (from elsewhere).
Telephone  playback  will  be  available  one hour after the conference call and
until  close of business 5.00 pm CET on April 30, 2003.  To access this playback
please  dial  the  following  numbers: 091 612 4330 (from Switzerland), 0207 866
4300  (from  the  UK),  +1 412 858 1440 (from the USA) and +41 91 612 4330 (from
elsewhere)  and  enter  the  PIN  code  519#  from  a  touch  tone  telephone.

The event will also be relayed by live audio webcast that interested parties may
access  via  Serono's Corporate home page, www.serono.com. A link to the webcast
will be provided immediately prior to the event, and accompanying slides will be
made  available  for  download  approximately 1 hour before the beginning of the
webcast.  Additionally,  the webcast will be available for replay until close of
business  on  May  16,  2003.

                                       ###
Some  of  the  statements  in  this  press  release  are  forward  looking. Such
statements  are inherently subject to known and unknown risks, uncertainties and
other  factors  that  may  cause  actual results, performance or achievements of
Serono  S.A.  and  affiliates  to be materially different from those expected or
anticipated  in  the  forward-looking statements. Forward-looking statements are
based on Serono's current expectations and assumptions, which may be affected by
a  number  of  factors, including those discussed in this press release and more
fully  described  in  Serono's  Annual  Report  on Form 20-F filed with the U.S.
Securities and Exchange Commission on April 17, 2003.  These factors include any
failure  or  delay  in  Serono's ability to develop new products, any failure to
receive  anticipated  regulatory  approvals,  any  problems  in  commercializing
current  products  as  a  result of competition or other factors, our ability to
obtain  reimbursement  coverage  for  our  products,  and government regulations
limiting  our  ability  to  sell  our  products. Serono has no responsibility to
update the forward-looking statements contained in this press release to reflect
events  or  circumstances  occurring  after  the  date  of  this  press release.
                                       ###

ABOUT SERONO

Serono  is  a  global  biotechnology  leader.  The  Company  has six recombinant
products  on  the  market,  Gonal-F(R),  Luveris(R),  Ovidrel(R)/Ovitrelle(R),
Rebif(R),  Serostim(R) and Saizen(R) (Luveris(R) is not approved in the USA). In
addition  to  being  the  world leader in reproductive health, Serono has strong
market  positions  in  neurology,  metabolism and growth. The Company's research
programs  are  focused  on  growing  these  businesses  and  on establishing new
therapeutic areas. Currently, there are over 30 projects in development.

Serono  was  awarded the International James D. Watson Helix 2003 Award from the
Biotechnology  Industry  Organization  (BIO)  in  recognition  of  the Company's
outstanding  leadership  and  highest  standards  of  scientific  and  product
achievement.

In  2002,  Serono  achieved  worldwide  revenues  of US$1.546 billion, and a net
income  of  US$321  million,  making it the third largest biotech company in the
world.  The  Company operates in 45 countries, and its products are sold in over
100  countries. Bearer shares of Serono S.A., the holding company, are traded on
the  virt-x  (SEO) and its American Depositary Shares are traded on the New York
Stock  Exchange  (SRA).


                                     -more-

FOR MORE INFORMATION, PLEASE CONTACT:


SERONO IN GENEVA, SWITZERLAND:
MEDIA RELATIONS:                INVESTOR RELATIONS:
Tel:   +41-22-739 36 00         Tel:   +41-22-739 36 01
Fax:   +41-22-739 30 85         Fax:   +41-22-739 30 22
http://www.serono.com           Reuters: SEOZ.VX / SRA.N
---------------------           Bloomberg: SEO VX / SRA US

SERONO, INC., ROCKLAND, MA
MEDIA RELATIONS:                INVESTOR RELATIONS:
Tel.   +1 781 681 2340          Tel.   +1 781 681 2552
Fax:   +1 781 681 2935          Fax:   +1 781 681 2912
http://www.seronousa.com
------------------------


On the following pages, there are:

     -    Tables  detailing  sales  in  dollars  by therapeutic area, geographic
          region  and the top 10 products for the 3 months ended March 31, 2003.

     -    The unaudited consolidated financial statements for the 3 months ended
          March  31,  2003,  including  income  statements,  balance  sheets and
          statements  of  cash  flows, prepared in accordance with International
          Financial  Reporting  Standards  (IFRS).


                                     -more-



                              SALES BY THERAPEUTIC AREA
                              -------------------------

                            THREE MONTHS ENDED                   THREE MONTHS ENDED
                               MARCH 31, 2003                      MARCH 31, 2002
                            $MILLION  % OF SALES   % CHANGE $   $MILLION  % OF SALES
-------------------------------------------------------------------------------------
                                                           
Multiple Sclerosis (Rebif)     175.2       43.00%       52.00%     115.3       36.80%
Reproductive Health            160.6       39.40%       13.70%     141.3       45.10%
Growth                          33.1        8.10%       12.30%      29.5        9.40%
AIDS Wasting                    19.9        4.90%        0.30%      19.9        6.30%
MS/Oncology (Novantrone)        12.8        3.10%      100.00%        --          --
Others                           6.2        1.50%      -20.00%       7.5        2.40%

-------------------------------------------------------------------------------------
Total sales (US$million)    $  407.8         100%       30.10%  $  313.5         100%





                             SALES BY GEOGRAPHIC REGION
                             --------------------------

                           THREE MONTHS ENDED                  THREE MONTHS ENDED
                             MARCH 31, 2003                      MARCH 31, 2002
                          $MILLION  % OF SALES   % CHANGE $   $MILLION  % OF SALES
-----------------------------------------------------------------------------------
                                                         
Europe                       185.6       45.50%       31.20%     141.5       45.10%
North America                149.2       36.60%       56.60%      95.3       30.40%
Latin America                 15.5        3.80%      -42.50%      26.9        8.60%
Others                        57.5       14.10%       15.20%      49.8       15.90%

-----------------------------------------------------------------------------------
Total sales (US$ million) $  407.8         100%       30.10%  $  313.5         100%



                                     -more-



                                   TOP TEN PRODUCTS

                              THREE MONTHS ENDED                  THREE MONTHS ENDED
                                MARCH 31, 2003                      MARCH 31, 2002
                             ---------------------------------------------------------

                   * TA      $MILLION  % OF SALES   % CHANGE $   $MILLION  % OF SALES
                                                         
Rebif(R)            MS          175.2        43.0%        52.0%     115.3        36.8%
Gonal-F(R)          RH          122.0        29.9%        20.5%     101.2        32.3%
Saizen(R)         Growth         33.1         8.1%        12.3%      29.5         9.4%
Serostim(R)       Wasting        19.9         4.9%         0.3%      19.9         6.3%
Novantrone(R)   MS/Oncology      12.8         3.1%       100.0%        --          --
Pergonal(R)         RH           10.3         2.5%        17.2%       8.8         2.8%
Metrodin HP(R)      RH            7.1         1.7%      (49.2%)      14.0         4.5%
Cetrotide(R)        RH            5.6         1.4%        52.9%       3.7         1.2%
Crinone(R)          RH            4.5         1.1%        41.5%       3.2         1.0%
Profasi(R)          RH            3.7         0.9%      (25.8%)       5.0         1.6%



                                 * THERAPEUTIC AREAS
         RH       = Reproductive Health          Wasting     = AIDS Wasting
         MS       = Multiple Sclerosis           Growth      = Growth Retardation
     Oncology     = Oncology



                                     -more-



CONSOLIDATED INCOME STATEMENTS



THREE MONTHS ENDED MARCH 31                   2003 *      %  OF               2002 *     %  of
                                             US$'000   REVENUES   % change   US$'000   Revenues
                                                                        
Revenues
Product sales                                407,786                  30.1%  313,532
Royalty and license income                    34,620                  22.1%   28,359
------------------------------------------------------------------------------------------------
TOTAL REVENUES                               442,406      100.0%      29.4%  341,891      100.0%
------------------------------------------------------------------------------------------------
Operating Expenses
Cost of product sales                         62,631                  23.4%   50,760
% of Sales                                      15.4%                           16.2%
Selling, general and administrative          140,916       31.9%      21.1%  116,340       34.0%
Research and development                     127,937       28.9%      69.1%   75,636       22.1%
Other operating expense, net                  45,751       10.3%     135.5%   19,430        5.7%
------------------------------------------------------------------------------------------------
Total Operating Expenses                     377,235       85.3%      43.9%  262,166       76.7%
------------------------------------------------------------------------------------------------
OPERATING INCOME                              65,171       14.7%    (18.3%)   79,725       23.3%
------------------------------------------------------------------------------------------------
Financial income, net                          8,382                  81.7%    4,613
Other expense, net                             1,499                             543
------------------------------------------------------------------------------------------------
Total Non Operating Income, Net                6,883                           4,070
------------------------------------------------------------------------------------------------
Income Before Taxes and Minority Interests    72,054       16.3%    (14.0%)   83,795       24.5%
Taxes                                         11,529                          14,245
------------------------------------------------------------------------------------------------
Income Before Minority Interests              60,525                          69,550
Minority interests                               367                              73
------------------------------------------------------------------------------------------------
NET INCOME                                    60,158       13.6%    (13.4%)   69,477       20.3%
------------------------------------------------------------------------------------------------

Milestone payment for Raptiva 1)              25,000                               0
Tax impact                                    (4,000)                              0

------------------------------------------------------------------------------------------------
NET INCOME W/O RAPTIVA MILESTONE PAYMENT      81,158       18.3%      16.8%   69,477       20.3%
------------------------------------------------------------------------------------------------

* Unaudited

1)  Payment made to Genentech for filing of Raptiva in Europe




                                              2003  2002  % CHANGE   2003          2002  % CHANGE
                                                                     W/O RAPTIVA
                                                                     MILESTONE
Basic Earnings per Share (in U.S. dollars)                           PAYMENT 1)
--------------------------------------------------------------------------------------------------
                                                                       
 - Bearer shares                              3.80  4.32    (12.2%)          5.12  4.32      18.5%
--------------------------------------------------------------------------------------------------
 - Registered shares                          1.52  1.73    (12.2%)          2.05  1.73      18.5%
--------------------------------------------------------------------------------------------------
 - American depositary shares                 0.09  0.11    (12.2%)          0.13  0.11      18.5%
--------------------------------------------------------------------------------------------------

Diluted Earnings per Share (in U.S. dollars)
 - Bearer shares                              3.79  4.32    (12.1%)          5.12  4.32      18.6%
--------------------------------------------------------------------------------------------------
 - Registered shares                          1.52  1.73    (12.1%)          2.05  1.73      18.6%
--------------------------------------------------------------------------------------------------
 - American depositary shares                 0.09  0.11    (12.1%)          0.13  0.11      18.6%
--------------------------------------------------------------------------------------------------


Basic earnings per share are calculated in accordance with IAS 33 (Earnings per
Share) by dividing the net income of the group, US$60.2 million (2002 US$69.5
million), by an appropriate number of shares. This is 11,443,975 bearer shares
(2002 11,670,858) and 11,013,040 registered shares (2002 11,013,040). The total
weighted average equivalent number of bearer shares is 15,849,191 (2002
16,076,074) for the three months ended March 31, 2003. As each American
depositary share represents ownership interest in one fortieth of a bearer
share, basic and diluted earnings per American depositary share is calculated as
one fortieth of the earnings per bearer share.

For diluted earnings per share, the total number of bearer shares is adjusted to
assume conversion of all share options granted to employees and directors. The
number of bearer shares used to calculate diluted earnings per share is
11,451,180 (2002 11,695,125).



                                     -more-



CONSOLIDATED BALANCE SHEETS

As of                                                           MARCH 31, 2003 *   December 31, 2002
                                                                         US$ 000              US$ 000
                                                                             
ASSETS
Current Assets
Cash and cash equivalents                                                603,323             686,033
Short-term financial assets                                              436,256             378,865
Trade accounts receivable                                                273,943             257,313
Inventories                                                              277,865             259,477
Prepaid expenses                                                          43,460              26,609
Other current assets                                                     192,435             208,100
-----------------------------------------------------------------------------------------------------
Total Current Assets                                                   1,827,282           1,816,397
-----------------------------------------------------------------------------------------------------

Long-Term Assets
Property, plant and equipment                                            604,715             554,509
Long-term financial assets                                               780,597             711,201
Intangible assets                                                        229,089             230,117
Deferred tax assets                                                      137,345             136,687
Other long-term assets                                                    44,420              45,763
-----------------------------------------------------------------------------------------------------
Total Long-Term Assets                                                 1,796,166           1,678,277
-----------------------------------------------------------------------------------------------------
TOTAL ASSETS                                                           3,623,448           3,494,674
-----------------------------------------------------------------------------------------------------

LIABILITIES
Current Liabilities
Bank advances                                                             61,065              70,093
Trade accounts payable                                                    66,127              60,591
Current portion of long-term debt                                         24,101              23,505
Income taxes                                                              33,397              55,152
Other current liabilities                                                418,437             348,704
-----------------------------------------------------------------------------------------------------
Total Current Liabilities                                                603,127             558,045
-----------------------------------------------------------------------------------------------------

Long-Term Liabilities
Long-term debt                                                            24,893              25,857
Deferred tax liabilities                                                  12,343              12,080
Other long-term liabilities                                              461,648             436,329
-----------------------------------------------------------------------------------------------------
Total Long-Term Liabilities                                              498,884             474,266
-----------------------------------------------------------------------------------------------------
Total Liabilities                                                      1,102,011           1,032,311
-----------------------------------------------------------------------------------------------------

-----------------------------------------------------------------------------------------------------
Minority Interests                                                         1,554               1,165
-----------------------------------------------------------------------------------------------------

SHAREHOLDERS' EQUITY
Share capital                                                            253,851             253,416
Share premium                                                          1,001,621             989,141
Treasury shares                                                         (147,526)           (126,460)
Retained earnings                                                      1,424,786           1,364,626
Fair value reserves                                                      (51,512)            (44,807)
Cumulative foreign currency translation adjustments                       38,663              25,282
-----------------------------------------------------------------------------------------------------
Total Shareholders' Equity                                             2,519,883           2,461,198
-----------------------------------------------------------------------------------------------------

-----------------------------------------------------------------------------------------------------
Total Liabilities, Minority Interests and Shareholders' Equity         3,623,448           3,494,674
-----------------------------------------------------------------------------------------------------


*    Unaudited



                                     -more-



CONSOLIDATED STATEMENTS OF CASH FLOWS


Three months ended March 31                                              2003 *      2002 *
                                                                        US$ 000      US$ 000
                                                                            
Cash Flows From Operating Activities
Income before taxes and minority interests                               72,054      83,795
Depreciation and amortization                                            34,498      22,846
Financial income                                                        (12,087)    (16,526)
Financial expense                                                         2,161       2,608
Other non-cash items                                                     13,686          (8)
--------------------------------------------------------------------------------------------
Cash Flows From Operating Activities Before Working Capital Changes     110,312      92,715
--------------------------------------------------------------------------------------------

Working Capital Changes
Trade accounts payable, other current liabilities and deferred income    74,800     (12,879)
Trade accounts receivable                                                (9,982)    (11,381)
Inventories                                                             (22,638)     (5,514)
Prepaid expenses and other current assets                                (6,200)      4,421
Taxes paid                                                              (31,081)    (22,424)
--------------------------------------------------------------------------------------------
NET CASH FLOWS FROM OPERATING ACTIVITIES                                115,211      44,938
--------------------------------------------------------------------------------------------

Cash Flows From Investing Activities
Purchase of property, plant and equipment                               (57,468)    (28,805)
Purchase of intangible and other long-term assets                        (7,257)     (2,616)
Purchase of financial assets                                           (130,926)   (777,970)
Other non-current liabilities                                            (4,308)     (6,903)
Proceeds from sale of property, plant and equipment                       2,220          24
Interest received                                                        21,330        (260)
--------------------------------------------------------------------------------------------
Net Cash Flows From Investing Activities                               (176,409)   (816,530)
--------------------------------------------------------------------------------------------

Cash Flows From Financing Activities
Proceeds from issuance of share capital                                  13,090      11,602
Proceeds from exercises of stock options                                    159         349
Premiums received on written calls                                          384          --
Purchase of treasury shares                                             (24,637)         --
Repayment of bank advances                                               (9,260)    (34,645)
Repayment of long-term debt                                              (1,517)       (605)
Interest paid                                                            (1,102)     (2,054)
--------------------------------------------------------------------------------------------
Net Cash Flows From Financing Activities                                (22,883)    (25,353)
--------------------------------------------------------------------------------------------
Effect of Exchange Rate Changes on Cash and Cash Equivalents              1,371        (672)
--------------------------------------------------------------------------------------------
Net Increase in Cash and Cash Equivalents                               (82,710)   (797,617)
--------------------------------------------------------------------------------------------

Cash and Cash Equivalents
- Beginning of period                                                   686,033   1,131,091
--------------------------------------------------------------------------------------------
- End of period                                                         603,323     333,474
--------------------------------------------------------------------------------------------


*  Unaudited



                                      -end-

                                   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.



                                           SERONO S.A.
                                           a Swiss corporation
                                           (Registrant)



April 24, 2003                        By:  /s/ Allan Shaw
                                           -----------------------------
                                           Name:  Allan Shaw
                                           Title: Chief Financial Officer