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 October, 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


Media  Release

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



                   SERONO REPORTS STRONG THIRD QUARTER RESULTS
              Best Quarter Ever with Net Income up 48.2% to $110.5m
                         Driven by Strong Revenue Growth
                         - Guidance for 2003 Confirmed -



GENEVA,  SWITZERLAND, OCTOBER 23, 2003 - Serono S.A. (virt-x: SEO and NYSE: SRA)
today  reported  its  third  quarter  results for the period ended September 30,
2003.

HIGHLIGHTS

-    Total  revenues  of  $502.7m,  up 32.9% in dollars and underlying growth of
     26.0%  in  local  currencies

-    Product  sales  up  32.7%  to  $463.5m

-    Significant  growth  of leading products in each therapeutic area: Rebif(R)
     up  52.1%,  Gonal-f(R)  up  12.1%  and  Saizen(R)  up  26.9%

-    Reported  net  income  of  $110.5m,  up 48.2% and 39.3% in local currencies

-    Basic  EPS  up  49.2%  to  $6.98  per  Bearer  Share and $0.17 per American
     Depositary  Share

-    Positive  European  CPMP  opinion  for  Gonal-f(R)  pre-filled pen injector

-    FDA approval and positive European CPMP opinion for Ovidrel(R)/Ovitrelle(R)
     pre-filled  syringe

-    Progress  of  promising  new  compounds,  oral cladribine and TACI-Ig, into
     clinical  development


"This has been our best quarter ever, with net income up 48.2% to $110.5m driven
by  strong  revenue  growth  in each of our businesses" said Ernesto Bertarelli,
Chief  Executive  Officer.

"Our  operational  momentum will result in an excellent 2003, and we are clearly
on  track  to  meet  our  guidance"  said  Allan  Shaw, Chief Financial Officer.


                                      more

FINANCIAL  PERFORMANCE

In  the third quarter of 2003, total revenues grew by 32.9% to $502.7m (Q3 2002:
$378.2m).  Product  sales  rose  32.7%  to $463.5m (Q3 2002: $349.3m). US dollar
weakness  caused a positive currency impact of $24.9m on product sales. In local
currencies,  product  sales  grew  by  25.4%.

Royalty and license income grew by 36.0% to $39.2m (Q3 2002: $28.8m).

Gross margin was 85.8% (Q3 2002: 83.2%) as a result of operational improvements.

Selling,  general  and  administrative expenses were $158.9m (Q3 2002: $117.8m),
reflecting  commercial  expenditure  and  marketing  programs.

Research  and  development  expenses  increased  to  $107.1m  or  21.3% of total
revenues  (Q3  2002:  $101.3m  or  26.8%  of  total  revenues).

Other  operating  expenses  reached  $53.6m  (Q3  2002:  $23.5m)  influenced  by
licensing  agreements  for  new  products  and  higher  royalties  paid to third
parties.

Operating  income  grew by 52.6% to $117.3m reflecting strong revenue growth and
cost-control management. Net financial income was $9.4m in the third quarter (Q3
2002:  $13.2m).

Reported  net  income grew 48.2% to $110.5m (Q3 2002: $74.5m), or 39.3% in local
currencies.

Reported basic earnings per share (EPS) grew 49.2% to $6.98 per bearer share (Q3
2002: $4.68) and $0.17 per American Depositary Share (ADS) (Q3 2002: $0.12). The
average  number  of  equivalent  bearer  shares outstanding for the three months
ended  September  30,  2003  was  15,829,041.


NEUROLOGY

In  the  third  quarter  of  2003,  total neurology sales were $222.2m. Rebif(R)
worldwide  sales  were up 52.1% (41.5% in local currencies) to $212.0m (Q3 2002:
$139.4m). Rebif(R) continued its market leadership outside the USA with sales up
by  33.1%  to  $161.6m  (Q3  2002:  $121.4m).

In  the  USA,  Rebif(R)  sales grew by 179.8% to $50.4m in the third quarter (Q3
2002:  $18.0m)  with  demand  continuing  to strengthen. Rebif(R) is the fastest
growing  multiple  sclerosis  (MS)  disease modifying drug and continues to gain
market  share  in  the  USA.

Novantrone(R)  sales  in MS were $10.2m in the third quarter (Q2 2003: $6.6m) as
marketing programs gained momentum (total Novantrone(R) sales were $26.3m).

On  September  19,  new data from a long-term assessment of a cohort of patients
with  relapsing-remitting  multiple  sclerosis  (RRMS)  on Rebif(R) therapy were
presented  at  the  19th  ECTRIMS  Congress.  The  results support the long-term
benefit  of  Rebif(R) 44 mcg subcutaneously three times weekly, in the treatment
of  RRMS  on  relapses,  disability  and  magnetic  resonance  imaging



(MRI)  outcomes  measured,  with  a favorable risk benefit profile through eight
years.  The  exact  relationship  between MRI findings and clinical outcomes for
patients  is  unknown.  The  results  also  reflect  the  importance of starting
treatment  early.


REPRODUCTIVE  HEALTH

In  the  third quarter, worldwide reproductive health product sales increased by
6.9%  to  $157.9m (Q3 2002: $147.7m). Sales of Gonal-f(R) grew by 12.1% (5.8% in
local  currencies)  to  $117.1m  (Q3  2002:  $104.5m).

Serono's  core  reproductive  health  portfolio  consisting of three recombinant
hormones  (Gonal-f(R),  Ovidrel(R),  Luveris(R))  and two complementary products
(Cetrotide(R),  Crinone(R))  grew  by  14.8%  to  $133.4m,  or  8.2%  in  local
currencies.  In  accordance  with  our  phase  out  plan, sales of urine-derived
gonadotropin represented only $21.8m (Q3 2002: $28.9m).

Several  significant  regulatory  milestones were achieved. On September 25, the
Committee  for  Proprietary  Medicinal Products (CPMP) issued a positive opinion
for  the  Gonal-f(R)  pre-filled  pen  injector  in  Europe. On September 30, an
Advisory  Committee of the Food and Drug Administration (FDA) issued a favorable
recommendation  for  Luveris(R)  in  Serono's  proposed indication of follicular
development  in  infertile  hypogonadotropic  hypogonadal  women  with  profound
luteinizing  hormone  deficiency. On July 24, the CPMP issued a positive opinion
for  Ovitrelle(R)  pre-filled  syringe  in  Europe.  Recently,  the  Ovidrel(R)
pre-filled syringe was approved by the FDA.


GROWTH  AND  METABOLISM

Sales of Serono's recombinant growth hormone products rose by 12.2% to $59.9m in
the  third  quarter (Q3 2002: $53.4m). Saizen(R) sales increased by 26.9% (18.9%
in  local  currencies)  to  $36.8m  (Q3  2002:  $29.0m).  The  favorable  market
acceptance  of the Saizen(R) family of devices in the USA and in Europe continue
to  make  Saizen(R) a popular choice with prescribers and patients.  Serostim(R)
sales  continue  to  be  stable  at  $23.0m  (Q3  2002: $24.4m). In the USA, the
Serostim(R)  Secured  Distribution  Program, which has been in operation for one
year,  has  been  recently  highlighted  by  staff  of the FDA as an outstanding
example of the use of a tracking and tracing technology to assure patient safety
and  product  integrity.


REGIONAL  SALES

Sales  performance  was  strong in all of our geographic areas. In Europe, sales
increased  by  25.7%  to $191.8m (Q3 2002: $152.5m). Sales in North America grew
strongly by 52.0% to reach $179.8m (Q3 2002: $118.3m). In the rest of the world,
sales  grew  by  17.1%  to  $91.9m  (Q3  2002:  $78.5m).


                                      more

R&D  NEWS

In  the  third quarter of 2003, progress was made in product development and the
following  molecules  moved  into  Phase  1  clinical  development:

  -  Cladribine,  potentially  the  first  oral treatment for multiple sclerosis
  -  TACI-Ig,  a fusion protein inhibitor of B-cell activation, which represents
     a  novel  therapeutic  approach  to  treating  autoimmune  diseases such as
     systemic  lupus  erythematosus, rheumatoid arthritis, and potentially other
     diseases  such  as  non-Hodgkin's  lymphoma.


INVESTOR  MEETINGS

Serono's senior management will be presenting a company update in Zurich, London
and  New  York  on  October 24, 27 and 28, 2003 respectively. The Zurich meeting
will  be  webcast.


CONFERENCE  CALL  AND  WEBCAST

Serono  will hold a conference call today, October 23, 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  third quarter 2003 results. To join the telephone
conference  please dial 091 610 5600 (from Switzerland), 0207 107 0611 (from the
UK),  1  866  291  4166  (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 6.00 pm CET on October 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  303#  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  November  15,  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.

                                       ###


                                      more

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$ 1.538 billion, and a net
income  of  US$321  million,  making it the third largest biotech company in the
world.  The  Company  operates  in 44 countries, and its products are sold in 94
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).



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 and 9 months ended September
          30,  2003.

     -    The unaudited consolidated financial statements for the 3 and 9 months
          ended  September 30, 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
                            SEPTEMBER 30, 2003                  SEPTEMBER 30, 2002

                           $MILLION  % OF SALES   % CHANGE $   $MILLION  % OF SALES
------------------------------------------------------------------------------------
                                                          
Neurology                     222.2        47.9%        59.4%     139.4        39.9%
Reproductive Health           157.9        34.1%         6.9%     147.7        42.3%
Growth & Metabolism            59.9        12.9%        12.2%      53.4        15.3%
Others                         23.5         5.1%       164.9%       8.8         2.5%
------------------------------------------------------------------------------------

Total sales (US$ million)  $  463.5         100%        32.7%  $  349.3         100%




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

                           THREE MONTHS ENDED                  THREE MONTHS ENDED
                           SEPTEMBER 30, 2003                  SEPTEMBER 30, 2002

                          $MILLION  % OF SALES   % CHANGE $   $MILLION  % OF SALES
-----------------------------------------------------------------------------------
                                                         
Europe                       191.8        41.4%        25.7%     152.5        43.7%
North America                179.8        38.8%        52.0%     118.3        33.9%
Latin America                 28.5         6.1%         9.4%      26.0         7.5%
Others                        63.4        13.7%        20.9%      52.5        14.9%
-----------------------------------------------------------------------------------

Total sales (US$million)  $  463.5         100%        32.7%  $  349.3         100%




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

                            NINE MONTHS ENDED                  NINE MONTHS ENDED
                           SEPTEMBER 30, 2003                  SEPTEMBER 30, 2002

                           $MILLION  % OF SALES   % CHANGE $   $MILLION  % OF SALES
------------------------------------------------------------------------------------
                                                          
Neurology                     608.1        45.4%        61.2%     377.3        37.2%
Reproductive Health           501.9        37.5%        10.0%     456.1        45.0%
Growth & Metabolism           175.1        13.1%        11.8%     156.6        15.5%
Others                         53.6         4.0%       126.5%      23.7         2.3%
------------------------------------------------------------------------------------

Total sales (US$ million)  $1,338.7         100%        32.1%  $1,013.7         100%




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

                            NINE MONTHS ENDED                    NINE MONTHS ENDED
                           SEPTEMBER 30, 2003                   SEPTEMBER 30, 2002
------------------------------------------------------------------------------------

                           $MILLION  % OF SALES   % CHANGE $   $MILLION  % OF SALES
                                                          

Europe                        580.9        43.4%        31.2%     442.6        43.7%
North America                 501.6        37.5%        50.3%     333.7        32.9%
Latin America                  69.4         5.2%      (16.8%)      83.4         8.2%
Others                        186.8        13.9%        21.4%     154.0        15.2%
------------------------------------------------------------------------------------

Total sales (US$ million)  $1,338.7         100%        32.1%  $1,013.7         100%



                                     -more-




                                  TOP TEN PRODUCTS


                              THREE MONTHS ENDED                   THREE MONTHS ENDED
                              SEPTEMBER 30, 2003                   SEPTEMBER 30, 2002
                              ---------------------------------------------------------

                    * TA      $MILLION  % OF SALES   % CHANGE $   $MILLION  % OF SALES
                                                          

Rebif (R)        MS              212.0        45.7%        52.1%     139.4        39.9%
Gonal-F (R)      RH              117.1        25.3%        12.1%     104.5        29.9%
Saizen (R)       Growth           36.8         7.9%        26.9%      29.0         8.3%
Novantrone (R)   MS/Oncology      26.3         5.7%       100.0%        --
Serostim (R)     Wasting          23.0         5.0%       (5.4%)      24.4         7.0%
Pergonal (R)     RH               11.8         2.5%       (2.0%)      12.0         3.4%
Cetrotide (R)    RH                5.6         1.2%        21.4%       4.6         1.3%
Metrodin HP (R)  RH                5.2         1.1%      (54.4%)      11.4         3.3%
Crinone (R)      RH                5.2         1.1%        28.6%       4.0         1.1%
Profasi (R)      RH                4.1         0.9%      (11.2%)       4.7         1.3%





                              NINE MONTHS ENDED                    NINE MONTHS ENDED
                              SEPTEMBER 30, 2003                   SEPTEMBER 30, 2002
                              ---------------------------------------------------------

                    * TA      $MILLION  % OF SALES   % CHANGE $   $MILLION  % OF SALES
                                                          

Rebif (R)        MS              586.2        43.8%        55.4%     377.3        37.2%
Gonal-F (R)      RH              378.6        28.3%        15.0%     329.2        32.5%
Saizen (R)       Growth          109.2         8.2%        24.0%      88.0         8.7%
Serostim (R)     Wasting          65.9         4.9%       (3.8%)      68.6         6.8%
Novantrone (R)   MS/Oncology      54.7         4.1%       100.0%        --
Pergonal (R)     RH               33.9         2.5%         3.7%      32.7         3.2%
Metrodin HP (R)  RH               19.5         1.5%      (50.9%)      39.7         3.9%
Cetrotide (R)    RH               17.1         1.3%        32.3%      12.9         1.3%
Crinone (R)      RH               14.4         1.1%        84.1%       7.8         0.8%
Profasi (R)      RH               12.9         1.0%      (12.9%)      14.8         1.5%




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


                                     -more-




CONSOLIDATED INCOME STATEMENTS



THREE MONTHS ENDED SEPTEMBER 30              2003 *       % OF               2002 *       % of
                                            US$'000   REVENUES   % change   US$'000   Revenues
                                                                       

Revenues
Product sales                               463,533                  32.7%  349,334
Royalty and license income                   39,187                  36.0%   28,821
-----------------------------------------------------------------------------------------------
TOTAL REVENUES                              502,720      100.0%      32.9%  378,155      100.0%
-----------------------------------------------------------------------------------------------
Operating Expenses
Cost of product sales                        65,753                  12.1%   58,631
% of Sales                                     14.2%                           16.8%
Selling, general and administrative         158,919       31.6%      34.9%  117,838       31.2%
Research and development                    107,102       21.3%       5.7%  101,312       26.8%
Other operating expense, net                 53,621       10.7%     128.1%   23,505        6.2%
-----------------------------------------------------------------------------------------------
Total Operating Expenses                    385,395       76.7%      27.9%  301,286       79.7%
-----------------------------------------------------------------------------------------------
OPERATING INCOME                            117,325       23.3%      52.6%   76,869       20.3%
-----------------------------------------------------------------------------------------------
Financial income, net                         9,412                (28.7%)   13,192
Other income/(expense), net                      62                 109.5%     (656)
-----------------------------------------------------------------------------------------------
Total Non Operating Income, Net               9,474                          12,536
-----------------------------------------------------------------------------------------------
Income Before Taxes and Minority Interests  126,799       25.2%      41.8%   89,405       23.6%
Taxes                                        17,011                          14,751
-----------------------------------------------------------------------------------------------
Income Before Minority Interests            109,788                          74,654
Minority interests                             (666)                            117
-----------------------------------------------------------------------------------------------
NET INCOME                                  110,454       22.0%      48.2%   74,537       19.7%
-----------------------------------------------------------------------------------------------

Comparative figures have been reclassified to conform with current year's presentation
* Unaudited






                                              2003  2002  % CHANGE


                                                 
Basic Earnings per Share (in U.S. dollars)
 - Bearer shares                              6.98  4.68     49.2%
--------------------------------------------  ----  ----  --------
 - Registered shares                          2.79  1.87     49.2%
--------------------------------------------  ----  ----  --------
 - American depositary shares                 0.17  0.12     49.2%
--------------------------------------------  ----  ----  --------

Diluted Earnings per Share (in U.S. dollars)
 - Bearer shares                              6.96  4.67     49.0%
--------------------------------------------  ----  ----  --------
 - Registered shares                          2.78  1.87     49.0%
--------------------------------------------  ----  ----  --------
 - American depositary shares                 0.17  0.12     49.0%
--------------------------------------------  ----  ----  --------


Basic earnings per share are calculated in accordance with IAS 33 (Earnings per
Share) by dividing the net income of the group, US$110.5 million (2002 US$74.5
million), by an appropriate number of shares. This is 11,423,825 bearer shares
(2002 11,532,883) and 11,013,040 registered shares (2002 11,013,040). The total
weighted average equivalent number of bearer shares is 15,829,041 (2002
15,938,099) for the three months ended September 30, 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
11,459,401 (2002 11,544,653).


                                     -more-




CONSOLIDATED INCOME STATEMENTS



NINE MONTHS ENDED SEPTEMBER 30                2003 *      %  OF                 2002 *      %  of
                                             US$'000    REVENUES   % change    US$'000    Revenues
                                                                           
Revenues
Product sales                               1,338,733                  32.1%  1,013,701
Royalty and license income                    114,820                  32.9%     86,398
------------------------------------------  ----------  ---------  ---------  ----------  ---------
TOTAL REVENUES                              1,453,553      100.0%      32.1%  1,100,099      100.0%
------------------------------------------  ----------  ---------  ---------  ----------  ---------
Operating Expenses
Cost of product sales                         199,201                  25.6%    158,584
% of Sales                                       14.9%                             15.6%
Selling, general and administrative           457,959       31.5%      27.3%    359,730       32.7%
Research and development                      343,571       23.6%      30.8%    262,681       23.9%
Other operating expense, net                  150,320       10.3%     158.9%     58,063        5.3%
------------------------------------------  ----------  ---------  ---------  ----------  ---------
Total Operating Expenses                    1,151,051       79.2%      37.2%    839,058       76.3%
------------------------------------------  ----------  ---------  ---------  ----------  ---------
OPERATING INCOME                              302,502       20.8%      15.9%    261,041       23.7%
------------------------------------------  ----------  ---------  ---------  ----------  ---------
Financial income, net                          24,816                 (9.2%)     27,324
Other income/(expense), net                       429                 123.4%     (1,833)
------------------------------------------  ----------  ---------  ---------  ----------  ---------
Total Non Operating Income, Net                25,245                            25,491
------------------------------------------  ----------  ---------  ---------  ----------  ---------
Income Before Taxes and Minority Interests    327,747       22.5%      14.4%    286,532       26.0%
Taxes                                          49,162                            47,278
------------------------------------------  ----------  ---------  ---------  ----------  ---------
Income Before Minority Interests              278,585                           239,254
Minority interests                                235                                62
------------------------------------------  ----------  ---------  ---------  ----------  ---------
NET INCOME                                    278,350       19.1%      16.4%    239,192       21.7%
------------------------------------------  ----------  ---------  ---------  ----------  ---------

Comparative figures have been reclassified to conform with current year's presentation
* Unaudited






                                              2003   2002  % CHANGE
                                                  

Basic Earnings per Share (in U.S. dollars)
 - Bearer shares                              17.58  14.92    17.8%
--------------------------------------------  -----  -----  -------
 - Registered shares                           7.03   5.97    17.8%
--------------------------------------------  -----  -----  -------
 - American depositary shares                  0.44   0.37    17.8%
--------------------------------------------  -----  -----  -------

Diluted Earnings per Share (in U.S. dollars)
 - Bearer shares                              17.55  14.90    17.8%
--------------------------------------------  -----  -----  -------
 - Registered shares                           7.02   5.96    17.8%
--------------------------------------------  -----  -----  -------
 - American depositary shares                  0.44   0.37    17.8%
--------------------------------------------  -----  -----  -------


Basic earnings per share are calculated in accordance with IAS 33 (Earnings per
Share) by dividing the net income of the group, US$278.3 million (2002 US$239.2
million), by an appropriate number of shares. This is 11,429,052 bearer shares
(2002 11,625,344) and 11,013,040 registered shares (2002 11,013,040). The total
weighted average equivalent number of bearer shares is 15,834,268 (2002
16,030,560) for the nine months ended September 30, 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
11,450,658 (2002 11,643,162).


                                     -more-




CONSOLIDATED BALANCE SHEETS


As of                                                           SEPTEMBER 30, 2003 *   December 31, 2002
                                                                              US$000              US$000
                                                                                 
ASSETS
Current Assets
Cash and cash equivalents                                                    661,930             686,033
Short-term financial assets                                                  437,796             378,865
Trade accounts receivable                                                    311,414             257,313
Inventories                                                                  305,021             259,477
Prepaid expenses                                                              33,021              26,609
Other current assets                                                         182,683             208,100
--------------------------------------------------------------  ---------------------  ------------------
Total Current Assets                                                       1,931,865           1,816,397
--------------------------------------------------------------  ---------------------  ------------------

Long-Term Assets
Property, plant and equipment                                                634,743             554,509
Long-term financial assets                                                   871,302             711,201
Intangible assets                                                            249,395             230,117
Deferred tax assets                                                          176,585             136,687
Other long-term assets                                                        37,753              45,763
--------------------------------------------------------------  ---------------------  ------------------
Total Long-Term Assets                                                     1,969,778           1,678,277
--------------------------------------------------------------  ---------------------  ------------------
TOTAL ASSETS                                                               3,901,643           3,494,674
--------------------------------------------------------------  ---------------------  ------------------

LIABILITIES
Current Liabilities
Bank advances                                                                 36,902              70,093
Trade accounts payable                                                        52,064              60,591
Current portion of long-term debt                                             19,422              23,505
Income taxes                                                                  29,687              55,152
Deferred income - current                                                     32,766              18,221
Other current liabilities                                                    396,443             330,483
--------------------------------------------------------------  ---------------------  ------------------
Total Current Liabilities                                                    567,284             558,045
--------------------------------------------------------------  ---------------------  ------------------

Long-term Liabilities
Long-term debt                                                                63,963              25,857
Deferred tax liabilities                                                      11,800              12,080
Deferred income - non-current                                                201,205             183,659
Provisions and other long-term liabilities                                   335,301             252,670
--------------------------------------------------------------  ---------------------  ------------------
Total Long-Term Liabilities                                                  612,269             474,266
--------------------------------------------------------------  ---------------------  ------------------
Total Liabilities                                                          1,179,553           1,032,311
--------------------------------------------------------------  ---------------------  ------------------

--------------------------------------------------------------  ---------------------  ------------------
Minority Interests                                                             1,465               1,165
--------------------------------------------------------------  ---------------------  ------------------

SHAREHOLDERS' EQUITY
Share capital                                                                253,882             253,416
Share premium                                                              1,002,752             989,141
Treasury shares                                                             (140,253)           (126,460)
Retained earnings                                                          1,557,993           1,364,626
Fair value reserves                                                          (26,193)            (44,807)
Cumulative foreign currency translation adjustments                           72,444              25,282
--------------------------------------------------------------  ---------------------  ------------------
Total Shareholders' Equity                                                 2,720,625           2,461,198
--------------------------------------------------------------  ---------------------  ------------------

--------------------------------------------------------------  ---------------------  ------------------
Total Liabilities, Minority Interests and Shareholders' Equity             3,901,643           3,494,674
--------------------------------------------------------------  ---------------------  ------------------

* Unaudited



                                     -more-




CONSOLIDATED STATEMENTS OF CASH FLOWS



Nine months ended September 30                                          2003 *      2002 *
                                                                        US$000      US$000
                                                                            
Cash Flows From Operating Activities
Income before taxes and minority interests                              327,747     286,532
Depreciation and amortization                                           100,849      74,432
Financial income                                                        (37,077)    (50,644)
Financial expense                                                        13,720       7,735
Other non-cash items                                                     23,503         656
---------------------------------------------------------------------  ---------  ----------
Cash Flows From Operating Activities Before Working Capital Changes     428,742     318,711
---------------------------------------------------------------------  ---------  ----------

Working Capital Changes
Trade accounts payable, other current liabilities and deferred income    72,346     162,574
Trade accounts receivable                                               (45,036)    (22,340)
Inventories                                                             (48,785)     (8,362)
Prepaid expenses and other current assets                                12,596     (22,539)
Taxes paid                                                              (67,697)    (47,985)
---------------------------------------------------------------------  ---------  ----------
NET CASH FLOWS FROM OPERATING ACTIVITIES                                352,166     380,059
---------------------------------------------------------------------  ---------  ----------

Cash Flows From Investing Activities
Acquisition of subsidiary                                                    --     (98,950)
Purchase of property, plant and equipment                              (125,323)    (71,062)
Purchase of intangible and other long-term assets                        (6,842)    (13,318)
Purchase of financial assets                                           (208,443)   (551,193)
Other non-current liabilities                                           (10,204)     (5,606)
Proceeds from sale of property, plant and equipment                       8,804      10,646
Interest received                                                        53,988      33,141
---------------------------------------------------------------------  ---------  ----------
Net Cash Flows From Investing Activities                               (288,020)   (696,342)
---------------------------------------------------------------------  ---------  ----------

Cash Flows From Financing Activities
Proceeds from issuance of share capital                                  13,105      11,611
Proceeds from exercises of stock options                                  7,651       1,384
Premiums received on written calls                                        1,249          --
Purchase of treasury shares                                             (24,637)    (96,582)
Repayment of bank advances                                              (30,812)    (71,909)
Repayment of long-term debt                                             (13,965)     (9,073)
Issuance of long-term debt                                               44,208          --
Interest paid                                                            (3,361)     (5,958)
Dividends paid                                                          (85,709)    (64,240)
---------------------------------------------------------------------  ---------  ----------
Net Cash Flows From Financing Activities                                (92,271)   (234,767)
---------------------------------------------------------------------  ---------  ----------
Effect of Exchange Rate Changes on Cash and Cash Equivalents              4,022       6,010
---------------------------------------------------------------------  ---------  ----------
Net (Decrease) in Cash and Cash Equivalents                             (24,103)   (545,040)
---------------------------------------------------------------------  ---------  ----------

Cash and Cash Equivalents
- Beginning of period                                                   686,033   1,131,091
---------------------------------------------------------------------  ---------  ----------
- End of period                                                         661,930     586,051
---------------------------------------------------------------------  ---------  ----------

* 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)



October 23, 2003                          By:     /s/ Allan Shaw
                                                  -------------------------
                                          Name:  Allan Shaw
                                          Title:    Chief Financial Officer