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                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                               ----------------
                                   FORM 10-K
(Mark
One)
 
  [X]            ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
                    OF THE SECURITIES EXCHANGE ACT OF 1934
                  For the fiscal year ended December 31, 1998
                                      OR
  [_]      TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
               SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED]
                      For the Transition period from  to
                          Commission File No. 1-4462
                               ----------------
                                STEPAN COMPANY
            (Exact name of registrant as specified in its charter)
              Delaware                                36-1823834
  (State or other jurisdiction of                  (I.R.S. Employer
   incorporation or organization)               Identification Number)
      Edens and Winnetka Road,                           60093
        Northfield, Illinois                           (Zip Code)
  (Address of principal executive
              offices)
        Registrant's telephone number including area code: 847-446-7500
         Securities registered pursuant to Section 12 (b) of the Act:


                                                         Name of Each Exchange
                    Title of Each Class                   on Which Registered
                    -------------------                  ---------------------
                                                     
      Common Stock, $1 par value                        New York Stock Exchange
                                                        Chicago Stock Exchange
      5 1/2% Convertible Preferred Stock, no par value  New York Stock Exchange
                                                        Chicago Stock Exchange

         Securities registered pursuant to Section 12 (g) of the Act:
                                     None
                               (Title of Class)
   Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to
the best of registrant's knowledge, in definitive proxy or information
statements incorporated by reference in part III of this Form 10-K or any
amendment to this Form 10-K. [ ].
   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, and (2) has been subject to such filing
requirements for the past 90 days. Yes  X   No
   Aggregate market value at February 28, 1999, of voting stock held by
nonaffiliates of the registrant: $161,889,000*
   Number of shares outstanding of each of the issuer's classes of common
stock as of February 28, 1999:


                Class                         Outstanding at February 28, 1999
                -----                         --------------------------------
                                           
      Common Stock, $1 par value                         9,678,176

                      Documents Incorporated by Reference


        Part of Form 10-K                        Document Incorporated
        -----------------                        ---------------------
                                       
      Part I, Item 1                      1998 Annual Report to Stockholders
      Part II, Items 5-8                  1998 Annual Report to Stockholders
      Part III, Items 10-12               Proxy Statement dated March 30, 1999

   *Based on reported ownership by all directors, officers and beneficial
owners of more than 5% of registrant's voting stock. However, this
determination does not constitute an admission of affiliate status for any of
these holders.
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                                    PART I
 
Item 1. Business
 
   Stepan Company and its subsidiaries (the "company") produce specialty and
intermediate chemicals which are sold to other manufacturers and then made
into a variety of end products. The company has three reportable segments:
surfactants, polymers and specialty products. Surfactants refer to chemical
agents which affect the interaction between two surfaces; they can provide
actions such as detergency (i.e., the ability of water to remove soil from
another surface), wetting and foaming, dispersing, emulsification (aiding two
dissimilar liquids to mix), demulsification and viscosity modifications.
Surfactants are the basic cleaning agent in detergents for washing clothes,
dishes, carpets, fine fabrics, floors and walls. Surfactants are also used for
the same purpose in shampoos and conditioners, toothpastes, cosmetics and
other personal care products. Commercial and industrial applications include
emulsifiers for agricultural insecticides and herbicides, emulsion polymers
such as floor polishes and latex foams and coatings, wetting and foaming
agents for wallboard manufacturing and surfactants for enhanced oil recovery.
Polymers derives its revenue from the sale of phthalic anhydride, polyols and
polyurethane foam systems used in plastics, building materials and
refrigeration industries. Specialty products sells chemicals used in food,
flavoring and pharmaceutical applications.
 
   In mid 1998, the company purchased the remaining 50 percent ownership of
its Colombian joint venture. As a result, Stepan Colombiana de Quimicos
(Stepan Colombia) became a wholly owned subsidiary.
 
   Effective June 30, 1998, the company acquired selected specialty surfactant
product lines from E.I. DuPont De Nemours Company. The acquired business
consists of phosphate esters, specialty ethoxylates and other specialty
quaternaries and polymers sold to the plastic and fiber industries. The
product lines supplement the company's existing surfactants and polymers
businesses and will be produced in current company manufacturing plants.
 
   On November 11, 1998, the company's wholly owned subsidiary, Stepan Canada,
Inc., acquired the Canadian anionic and cationic surfactant business from
Boehme Filatex Canada, Inc. The acquired product lines are sold primarily into
the personal care and the institutional cleaning product markets.
 
MARKETING AND COMPETITION
 
   Principal markets for surfactants are manufacturers of detergents,
shampoos, lotions, toothpastes and cosmetics. Surfactants are also sold to the
producers of emulsifiers and lubricating products. The company also is a
principal provider of polymers used in construction, refrigeration,
automotive, boating and other consumer product industries. Specialty products
are used primarily by food and pharmaceutical manufacturers.
 
   The company does not sell directly to the retail market, but sells to a
wide range of manufacturers in many industries and has many competitors. The
principal methods of competition are product performance, price and
adaptability to the specific needs of individual customers. These factors
allow the company to compete on a basis other than solely price, reducing the
severity of competition as experienced in the sales of commodity chemicals
having identical performance characteristics. The company is a leading
merchant producer of surfactants in the United States. In the case of
surfactants, much of the company's competition comes from the internal
divisions of larger companies, as well as several large national and regional
producers. In the manufacture of polymers, the company competes with the
chemical divisions of several large companies, as well as with other small
specialty chemical manufacturers. In recent years, the company has also faced
periodic competition from foreign imports of phthalic anhydride. In specialty
products, the company competes with several large firms plus numerous small
companies. The company does not expect any significant changes in the
competitive environment in the foreseeable future.
 
                                       1

 
MAJOR CUSTOMER AND BACKLOG
 
   The company does not have any one single customer whose business represents
more than 10 percent of the company's consolidated revenue. Most of the
company's business is essentially on the "spot delivery basis" and does not
involve a significant backlog. The company does have some contract
arrangements with certain customers, but purchases are generally contingent on
purchaser requirements.
 
ENERGY SOURCES
 
   Substantially all of the company's manufacturing plants operate on
electricity and interruptable gas purchased from local utilities. During peak
heating demand periods, gas service to all plants may be temporarily
interrupted for varying periods ranging from a few days to several months. The
plants operate on fuel oil during these gas interruption periods. The company
has not experienced any plant shutdowns or adverse effects upon its business
in recent years that were caused by a lack of available energy sources.
 
RAW MATERIALS
 
   The most important raw materials used by the company are of a petroleum or
vegetable nature. For 1999, the company has commitments from suppliers to
cover its forecasted requirements and is not substantially dependent upon any
one supplier.
 
RESEARCH AND DEVELOPMENT
 
   The company maintains an active research and development program to assist
in the discovery and commercialization of new knowledge with the intent that
such effort will be useful in developing a new product or in bringing about a
significant improvement to an existing product or process. Total expenses for
research and development during 1998, 1997 and 1996 were $12,219,000,
$12,404,000, and $12,469,000, respectively. During 1998 and 1997, the research
and development staff consisted of 188 and 182 employees, respectively. The
balance of expenses reflected on the Consolidated Statements of Income relates
to technical services which include routine product testing, quality control
and sales support service.
 
ENVIRONMENTAL COMPLIANCE
 
   Compliance with applicable federal, state and local regulations regarding
the discharge of materials into the environment, or otherwise relating to the
protection of the environment, resulted in capital expenditures by the company
of approximately $7,136,000 during 1998. Such capital expenditures in 1999
should approximate $4.0 to $5.0 million. These expenditures represented
approximately 16 percent of the company's capital expenditures in 1998 and are
expected to be approximately 14 percent of such expenditures in 1999. These
expenditures, when incurred, are depreciated and charged on a straight-line
basis to pre-tax earnings over their respective useful lives which are
typically 10 years. Compliance with such regulations is not expected to have a
material adverse effect on the company's earnings and competitive position in
the foreseeable future.
 
EMPLOYMENT
 
   At December 31, 1998 and 1997, the company employed worldwide 1,372 and
1,292 persons, respectively.
 
FOREIGN OPERATIONS
 
   See Note 13, Segment Reporting, on page 35 of the company's 1998 Annual
Report to Stockholders.
 
                                       2

 
SEGMENTS
 
   The company has three reportable segments: surfactants, polymers and
specialty products. Their contribution to sales for the three years ended
December 31, 1998, were:
 


                                                                       Specialty
                                                  Surfactants Polymers Products
                                                  ----------- -------- ---------
                                                              
      1998.......................................      78%       18%        4%
      1997.......................................      79%       18%        3%
      1996.......................................      77%       19%        4%

 
   See Note 13, Segment Reporting, on page 35 of the company's 1998 Annual
Report to Stockholders.
 
Item 2. Properties
 
   The company's corporate headquarters and central research laboratories are
located in Northfield, Illinois. The Northfield facilities contain
approximately 70,000 square feet on an eight acre site. In addition, the
company leases 49,000 square feet of office space in a nearby office complex.
 
   Stepan Canada maintains a leased sales office in Mississagua, Canada.
Stepan Mexico maintains a leased sales office in Mexico City, Mexico.
 
   Surfactants are produced at four plants in the United States and five
wholly owned subsidiaries: one in France, Canada, Mexico, Colombia and
Germany. The principal plant is located on a 626 acre site at Millsdale
(Joliet), Illinois. A second plant is located on a 44 acre tract in
Fieldsboro, New Jersey. West Coast operations are conducted on an eight acre
site in Anaheim, California. A fourth plant is located on a 175 acre site in
Winder, Georgia. The plant, laboratory and office of Stepan Europe are located
on a 20 acre site near Grenoble, France. Stepan Canada, Inc. is located on a
70 acre leased, with an option to purchase, site in Longford Mills, Ontario,
Canada. Stepan Mexico is located on a 13 acre site in Matamoros, Mexico.
Stepan Germany is located on a five acre site in Cologne, Germany. Stepan
Colombia is located on a five acre site in Manizales, Colombia. The phthalic
anhydride, polyurethane systems and polyurethane polyols plants are also
located at Millsdale. Specialty products are mainly produced at a plant
located on a 19 acre site in Maywood, New Jersey.
 
   The company owns all of the foregoing facilities except the leased office
space and Canadian plant site mentioned above. The company believes these
properties are adequate for its operations.
 
Item 3. Legal Proceedings
 
   On October 22, 1998, the company received a general notice letter
indicating that the company might be a potentially responsible party at the
Casmalia Disposal Site in Santa Barbara County, California. Following request
for information, the company was apprised that it is considered to be a de
minimis party at this site and that the United States Environmental Protection
Agency (USEPA) has allocated the company an amount of $269,955 to settle this
liability with regard to this site. Because of the way in which the numbers at
this site were arrived at by the USEPA, the company has joined a de minimis
settling parties group to see if this amount can be reduced. Discussions with
the EPA are continuing.
 
   On December 28, 1998, the company received notification that it may be a
potentially responsible party at the Four County Landfill in DeLonge, Indiana
as a result of the company's Maywood, New Jersey operations utilizing Chem Met
Inc. as a waste hauler. The allegation is that Chem Met reportedly
transshipped wastes from the company's Maywood, New Jersey facility to the
site. While the company denies liability at this site, the company has entered
into an Agreed Order for Remedial Design/Remedial Action for Operable Unit 1
and has paid the amount of $400 in settlement of its obligations thereunder.
 
   As reported previously, the company was notified pursuant to Section 107A
of the Comprehensive Environmental Response Compensation and Liability Act
(CERCLA) as amended that it may be potentially
 
                                       3

 
responsible for the response costs that have been incurred with respect to a
landfill site known as the Ewan Property Superfund Site located in Shawong
Township, Burlington County, New Jersey. The company's alleged liability at
this site arises out of the alleged illegal disposal of waste at this site by
Lightman Drum Company in the early 1970s. The company and other PRPs have
agreed to a non-binding allocation process and have been funding remediation
activities at this site. The company is however, contesting its liability at
this site as more fully described below in U.S. v. Jerome Lightman (92CV4710)
(JVS).
 
   As reported previously, the company was named a third-party defendant in an
action entitled U.S. v. Jerome Lightman (92CV4710) (JVS) which case originally
involved only the Government's claim for past costs at the landfill site at
D'Imperio located in Hamilton Township, New Jersey. This site is another one
at which Lightman Drum Company allegedly illegally disposed of waste. Cross-
claims were filed by each potentially responsible party against other
potentially responsible parties and the suit as to these cross-claims has been
expanded to include the Ewan Shawong Township site as well. As an
accommodation, the company has agreed previously to make payment, without
admitting its liability, to the Government for the Government's past costs
with regard to this site. The Consent Order with the Government has been
lodged and the company has filed objections to it, because the company
believes it has defenses to the past costs. Payment of past costs removed the
Government from the lawsuit but the cross-claims filed by each potentially
responsible party against the other party are left. As to these cross-claims,
the company has filed a motion for summary judgment and motion to strike other
third-party defendants' expert witnesses. It is anticipated that a ruling from
the Federal District Court in Trenton, New Jersey will appear in May or June
of 1999. If the company's motions are granted, the company believes that its
liability at both the Ewan and D'Imperio sites will cease.
 
   As to other following sites:
 
- --ABC Barrel & Drum Co. -- Detroit, Michigan
- --Batavia Landfill -- Batavia, New York
- --Bofors Nobel Site -- Muskegon, Michigan
- --Chemsol, Inc. -- Piscataway, New Jersey
- --Chem-Trol Pollution Services, Inc. -- Hamburg, New York
- --Delilah Road Site -- Atlantic County, New Jersey
- --Gallup's Quarry -- Plainfield, Connecticut
- --Iron Horse Park/Shaffer Landfill -- Billerica, Massachusetts
- --Nyanza Chemical Waste Dump -- Ashland, Massachusetts
- --Memphis Container aka Tri-State Drums -- Memphis, Shelby County, Tennessee
- --Twin Cities -- Arvada, Colorado
- --and Virginia RR Washout,
 
all of which have been previously reported, there has been no further activity
or inquiry since the first notice.
 
   As reported previously in November 1992, the company received notification
from Olin Corporation that Olin Corporation had incurred costs in cleaning up
a plant site formerly owned by the company in Wilmington, Massachusetts. The
company entered into a settlement agreement with Olin which resolved its
liability with regard to the company's liability for environmental matters at
this site, if any. Subsequent thereto, Olin Corporation sued three prior
owners of this site who in turn, bought the company and is a third-party
defendant in an action entitled Olin Corporation v. Fisions plc, et al., Civil
Action No. 93-11166-MLW. The company subsequently filed a motion for
contribution protection and was granted that protection with regard to all
matters with the exception of Resource, Conservation and Recovery Act claims
brought by the third party against the company. That motion is still pending
in the Federal District Court in Boston. Discovery continues in the case and
the company cannot estimate what its liability, if any, will be for this
third-party RCRA claim, if any, but believes it is protected from liability
under the laws of contribution of the Commonwealth of Massachusetts.
 
   The company's site in Maywood, New Jersey and property formerly owned by
the company adjacent to its current site, were listed on the National
Priorities List in September 1993 pursuant to the provisions of the
 
                                       4

 
Comprehensive Environmental Response Compensation and Liabilities Act because
of certain alleged chemical contaminations. Pursuant to an Administrative
Order on Consent entered into between the United States Environmental
Protection Agency (USEPA) and the company for property formerly owned by the
company, and the issuance of an order by the USEPA to the company for property
currently owned by the company, the company has completed a Remedial
Investigation Feasibility study in 1994. The company has been awaiting the
issuance of a Record of Decision from the USEPA which would relate to both the
currently owned and formerly owned company property and would recommend the
type of remediation required on each property. It is now estimated that a
Record of Decision will be issued by the USEPA in the third quarter of 1999.
 
   As to radiological contamination on the company's property and other
properties in Maywood, Rochelle Park and Lodi, New Jersey, the company entered
into a Memorandum of Understanding with the United States of America
represented by the Department of Energy (Agreement) in 1985. Pursuant to this
Agreement, the Department of Energy took title to radiological contaminated
materials and was to remediate, at its expense, all radiological contamination
on the company's property and other properties in the Maywood, Rochelle Park
and Lodi areas. The properties were remediated by the Department of Energy
under the Formerly Utilized Sites Remedial Action Program, a federal program
under which the U.S. Government undertook to remediate properties which were
used to process radiological material for the U.S. Government. In 1997,
responsibility for this clean-up was transferred to the United States Army
Corps of Engineers (USACE). On January 29, 1999, the company received a copy
of the USACE Report to Congress dated January 1998 in which the USACE
expressed their intention to evaluate with the USEPA whether the company or
other parties might be responsible for cost recovery or contributions for work
performed by the USACE and to turn over such evaluations at some time in the
future, to the Department of Justice for the Department of Justice to
determine whether or not cost recovery or contribution claims are appropriate
against the company or other parties who may be potentially responsible for
radiological contamination from commercial operations or for chemically
contaminating the radiological contamination.
 
   As no claim for contribution or cost recovery has been made by the
Department of Justice, the company cannot make any estimate as to its
liability, if any. However, given the fact that the company has the Agreement
with the United States of America covering radiological remediation, it is the
company's belief that its liability, if any, has been resolved with regard to
the United States of America as to the radiological contamination, including
radiological contamination which is co-mingled with other chemicals.
 
Item 4. Results of Votes of Security Holders
 
   No matters were submitted to stockholders during the fourth quarter of the
fiscal year ended December 31, 1998.
 
Executive Officers of the Registrant
 
   Executive Officers are elected annually by the Board of Directors at the
first meeting following the Annual Meeting of Stockholders to serve until the
next annual meeting of the Board and until their respective successors are
duly elected and qualified.
 
   Effective February 15, 1999, the company announced that F. Quinn Stepan,
Jr., has been elected President and Chief Operating Officer. He was previously
Vice President and General Manager--Surfactants as of January 1, 1997, Vice
President--Global Laundry and Cleaning Products as of May 1996 and Director--
Business Management as of May 1992. Mr. F. Quinn Stepan, Sr., who has served
the company as Chairman and Chief Executive Officer since 1984 and as
President since 1973, will remain Chairman and Chief Executive Officer.
 
   Effective February 16, 1999, John V. Venegoni was appointed Corporate Vice
President and General Manager--Surfactants. Since May 1992 until May 1996, he
served as a Senior Business Manager--Consumer Products. From May 1996, until
present, he was Director--Global Personal Care.
 
                                       5

 
   Charles W. Given retired in 1998. He held a number of positions in the
company, most recently as Vice President--Corporate Development.
 
   Effective May 22, 1995, Jeffrey W. Bartlett, formerly Vice President,
General Counsel and Corporate Secretary, was appointed Vice President, General
Counsel, Regulatory Affairs and Corporate Secretary. Effective January 1,
1995, James A. Hartlage, who was formerly the Senior Vice President--
Technology, was appointed Senior Vice President--Technology and Operations. In
addition, during 1995 he assumed Administrative responsibilities. Effective
January 1, 1995, Earl H. Wagener, formerly Vice President--Product
Development, was appointed Vice President--Research and Development. All other
executive officers have remained in their current capacity for over five
years.
 
   The Executive Officers of the company, their ages as of February 28, 1999,
and certain other information are as follows:
 


                                                                         Year First
    Name       Age                        Title                        Elected Officer
    ----       ---                        -----                        ---------------
                                                              
F. Quinn
 Stepan......  61  Chairman and Chief Executive Officer                     1967
James A.
 Hartlage....  61  Senior Vice President--Technology and Operations         1980
Ronald L.
 Siemon......  61  Vice President and General Manager--Polymers             1992
Jeffrey W.     55  Vice President, General Counsel, Regulatory Affairs      1983
 Bartlett....      and Corporate Secretary
Walter J.
 Klein.......  52  Vice President--Finance                                  1985
Mickey
 Mirghanbari.  61  Vice President--Manufacturing and Engineering            1992
Earl H.
 Wagener.....  58  Vice President--Research and Development                 1995
F. Quinn
 Stepan, Jr..  38  President and Chief Operating Officer                    1997
John V.
 Venegoni....  40  Vice President and General Manager--Surfactants          1999

 
                                    PART II
 
Item 5. Market for Registrant's Common Stock and Related Security Holder
Matters
 
   (a) The company's common stock is listed and traded on both the New York
Stock Exchange and the Chicago Stock Exchange. See page 37 of the company's
1998 Annual Report to Stockholders for market price information which is
incorporated by reference herein.
 
   The company's 5 1/2 percent convertible preferred stock is listed and
traded on the New York Stock Exchange and the Chicago Stock Exchange. See Note
7 on page 31 of the company's 1998 Annual Report to Stockholders for the
description of the preferred stockholders' rights which is incorporated by
reference herein.
 
   From time to time the company purchases shares of its common stock in the
open market and in block transactions from dealers for the purpose of funding
option grants under its stock option plans and deferred compensation plans for
directors and officers.
 
   (b) On February 28, 1999, there were 1,522 holders of common stock of the
company.
 
   (c) See page 37 of the company's 1998 Annual Report to Stockholders for
dividend information which is incorporated by reference herein. Also see Note
4 on page 29 of the company's 1998 Annual Report to Stockholders which sets
forth the restrictive covenants covering dividends.
 
Item 6. Selected Financial Data
 
   See page 37 of the company's 1998 Annual Report to Stockholders for a five
year summary of selected financial information which is incorporated by
reference herein.
 
                                       6

 
Item 7. Management's Discussion and Analysis of Financial Condition and
     Results of Operations and Quantitative and Qualitative Disclosures about
     Market Risk
 
   See pages 14 through 20 of the company's 1998 Annual Report to Stockholders
which is incorporated by reference herein.
 
   Some information contained in the Management's Discussion and Analysis is
forward looking and involves risks and uncertainties. The results achieved
this year are not necessarily an indication of future prospects for the
company. Actual results in future years may differ materially. Potential risks
and uncertainties include, among others, fluctuations in the volume and timing
of product orders, changes in demand for the company's products, changes in
technology, continued competitive pressures in the marketplace, availability
of raw materials, foreign currency fluctuations and general economic
conditions.
 
Item 8. Financial Statements and Supplementary Data
 
   See pages 21 through 36 of the company's 1998 Annual Report to Stockholders
for the company's consolidated financial statements, notes to the consolidated
financial statements and auditors' report which are incorporated by reference
herein.
 
   See page 37 of the company's 1998 Annual Report to Stockholders for
selected quarterly financial data which is incorporated by reference herein.
 
Item 9. Disagreements on Accounting and Financial Disclosure
 
   None
 
                                   PART III
 
Item 10. Directors and Executive Officers of the Registrant
 
   (a) Directors
 
   Mr. Paul Stepan is a general partner of a partnership having an interest in
certain real estate which is unrelated to the business of the company. The
partnership of which Mr. Paul Stepan is a general partner, filed in bankruptcy
for Chapter 11 protection in February, 1998. Mr. Paul Stepan advised that a
refinancing package and successful discharge from Chapter 11 occurred.
 
   For additional information about the company's Directors, see pages 3
through 5 of the company's Proxy Statement dated March 30, 1999, for the
Annual Meeting of Stockholders which are incorporated by reference herein.
 
   (b) Executive Officers
 
     See Executive Officers of the Registrant in Part I above.
 
Item 11. Executive Compensation
 
   See pages 7 and 8 of the company's Proxy Statement dated March 30, 1999,
for the Annual Meeting of the Stockholders which are incorporated by reference
herein.
 
Item 12. Security Ownership of Certain Beneficial Owners and Management
 
   See pages 1 through 6 of the company's Proxy Statement dated March 30,
1999, for the Annual Meeting of Stockholders which are incorporated by
reference herein.
 
                                       7

 
Item 13. Certain Relationships and Related Transactions
 
   None
 
                                    PART IV
 
Item 14. Exhibits, Financial Statement Schedules and Reports on Form 8-K
 
   (a) & (d) Financial Statements and Schedules
 
     See the Index to the Consolidated Financial Statements and Supplemental
  Schedule filed herewith.
 
   (b) Reports on Form 8-K
 
     None
 
   (c) Exhibits
 
     See Exhibit Index filed herewith.
 
                                       8

 
                                  SIGNATURES
 
   Pursuant to the requirements of Section 13 or 15(d) 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.
 
                                          Stepan Company
 
                                          By        Jeffrey W. Bartlett
                                             Vice President, General Counsel,
                                             Regulatory Affairs and Corporate
                                                         Secretary
 
March 29, 1999
 
   Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
Registrant and in the capacities and on the dates indicated.
 
 
 

                                                             
          F. Quinn Stepan             Chairman, Chief Executive      March 29, 1999
____________________________________     Officer and Director
          F. Quinn Stepan
 

 

                                                             
        F. Quinn Stepan, Jr.          President, Chief Operating     March 29, 1999
____________________________________      Officer and Interim
        F. Quinn Stepan, Jr.                   Director
 
           Walter J. Klein             Vice President--Finance,      March 29, 1999
____________________________________    Principal Financial and
          Walter J. Klein              Accounting Officer
 
         James A. Hartlage             Senior Vice President--       March 29, 1999
____________________________________   Technology and Operations
         James A. Hartlage                  and Director
 
         Thomas F. Grojean                     Director              March 29, 1999
____________________________________
         Thomas F. Grojean
 
           Paul H. Stepan                      Director              March 29, 1999
____________________________________
           Paul H. Stepan
 
         Robert D. Cadieux                     Director              March 29, 1999
____________________________________
         Robert D. Cadieux
 
          Robert G. Potter                     Director              March 29, 1999
____________________________________
          Robert G. Potter
 

 
   Jeffrey W. Bartlett, pursuant to powers of attorney executed by each of the
directors and officers listed above, does hereby execute this report on behalf
of each of such directors and officers in the capacity in which the name of
each appears above.
 
                                          Jeffrey W. Bartlett
 
March 29, 1999
 
                                       9

 
                                 INDEX TO THE
                       CONSOLIDATED FINANCIAL STATEMENTS
                                      AND
                             SUPPLEMENTAL SCHEDULE
 
   A copy of Stepan Company's Annual Report to Stockholders for the year ended
December 31, 1998, has been filed as an exhibit to this Annual Report on Form
10-K. Pages 21 through 36 of such Annual Report to Stockholders contain the
Consolidated Balance Sheets as of December 31, 1998 and 1997, the Consolidated
Statements of Income, Stockholders' Equity and Cash Flows and Notes to
Consolidated Financial Statements for the three years ended December 31, 1998,
1997 and 1996, and the Auditors' Report covering the aforementioned financial
statements. These consolidated financial statements and the Auditors' Report
thereon are incorporated herein by reference.
 
   Supplemental Schedule II--Allowance for Doubtful Accounts--to Consolidated
Financial Statements, which is required to comply with regulation S-X, and the
Auditors' report on such Supplemental Schedule are included on pages 11 and 12
of this Form 10-K.
 
   Certain supplemental schedules are not submitted because they are not
applicable or not required, or because the required information is included in
the financial statements or notes thereto.
 
                                      10

 
                                 STEPAN COMPANY
 
           SUPPLEMENTAL SCHEDULE TO CONSOLIDATED FINANCIAL STATEMENTS
                      FOR THE YEAR ENDED DECEMBER 31, 1998
                   AS REQUIRED TO COMPLY WITH REGULATION S-X
 
Schedule II--Allowance for Doubtful Accounts:
 
   Below is an analysis of the allowance for doubtful accounts for the three
years ended December 31:
 


                                                          1998    1997    1996
                                                         ------  ------  ------
                                                            (In Thousands)
                                                                
Balance, Beginning of Year.............................. $2,121  $2,074  $1,744
  Provision charged to income...........................    339     548     442
  Accounts written off, net of recoveries...............   (197)   (501)   (112)
                                                         ------  ------  ------
Balance, End of Year.................................... $2,263  $2,121  $2,074
                                                         ======  ======  ======

 
                                       11

 
                   REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
                           ON SUPPLEMENTAL SCHEDULE
 
To Stepan Company:
 
   We have audited in accordance with generally accepted auditing standards,
the financial statements included in Stepan Company's Annual Report to
Stockholders incorporated by reference in this Form 10-K, and have issued our
report thereon dated February 11, 1999. Our audit was made for the purpose of
forming an opinion on those statements taken as a whole. The supplemental
schedule listed in the index of financial statements is the responsibility of
the company's management and is presented for purposes of complying with the
Securities and Exchange Commission's rules and is not part of the basic
financial statements. This schedule has been subjected to the auditing
procedures applied in the audit of the basic financial statements and, in our
opinion, fairly states in all material respects the financial data required to
be set forth therein in relation to the basic financial statements taken as a
whole.
 
                                          Arthur Andersen LLP
 
Chicago, Illinois,
February 11, 1999
 
                                      12

 
                                 EXHIBIT INDEX
 


  Exhibit
    No.                                 Description
  -------                               -----------
 
        
 (3)a      Copy of the Certificate of Incorporation, and the Certificates of
           Amendment of Certificate of Incorporation dated May 6, 1968, April
           20, 1972, April 16, 1973, December 2, 1983. Filed with the Company's
           Annual Report on Form 10-K for the year ended December 31, 1983, and
           incorporated herein by reference.
 
 (3)b      Copy of the Bylaws of the company as amended through February 15,
           1999.
 
 (3)c      Copy of Certificate of Amendment, dated April 28, 1993, to Article
           IV of Certificate of Incorporation. (Note 7)
 
 (3)d      Copy of Certificate of Amendment, dated May 5, 1987, to Article X of
           Certificate of Incorporation. (Note 1)
 
 (4)h      Copy of Loan Agreement dated June 15, 1995, with Aid Association for
           Lutherans, the Northwestern Mutual Life Insurance Company and The
           Mutual Life Insurance Company of New York. (Note 10)
 
 (4)i      Copy of Revolving Credit and Term Loan Agreement dated February 20,
           1990, with The First National Bank of Chicago and the amendment
           dated March 21, 1990. (Note 3)
 
 (4)m      Copy of Second Amendment dated September 20, 1991, amending
           Revolving Credit and Term Loan Agreement dated February 20, 1990
           (see (4)i above). (Note 4)
 
 (4)m(1)   Copy of Third Amendment dated December 29, 1992, amending Revolving
           Credit and Term Loan Agreement dated February 20, 1990 (see (4)i and
           (4)m above). (Note 8)
 
 (4)m(2)   Copy of Fourth Amendment dated May 31, 1994, amending Revolving
           Credit and Term Loan Agreement dated February 20, 1990 (see (4)i,
           (4)m and (4)m(1) above). (Note 9)
 
 (4)n(1)   Copy of Certificate of Designation, Preferences and Rights of the 5
           1/2% Convertible Preferred Stock, without Par Value and the Amended
           Certificate dated August 12, 1992 and April 28, 1993. (Note 7)
 
 (4)n(2)   Copy of Issuer Tender Offer Statement on Schedule 13E-4 dated August
           13, 1992. (Note 6)
 
 (4)n(3)   Copy of Amendment No. 1 to Schedule 13E-4 (see also (4)n(2) above)
           dated September 23, 1992. (Note 6)
 
 (4)n(4)   Copy of the company's Form 8-A dated August 13, 1992. (Note 6)
 
 (4)o      Copy of Revolving Credit and Term Loan Agreement dated January 9,
           1998, with The First National Bank of Chicago. (Note 11)
 
 (4)p      Copy of Term Loan Agreement dated October 1, 1998, with The
           Northwestern Mutual Life Insurance Company and Connecticut General
           Life Insurance Company.
 
           In accordance with 601(b)(4) (iii) of Regulation S-K, certain debt
           instruments are omitted, where the amount of securities authorized
           under such instruments does not exceed 10% of the total consolidated
           assets of the Registrant. Copies of such instruments will be
           furnished to the Commission upon request.
 
 (10)a     Description of the 1965 Directors Deferred Compensation Plan. (Note
           2)
 
 (10)b     Copy of the 1969 Management Incentive Compensation Plan as amended
           and restated as of January 1, 1992. (Note 5)
 
 (10)d     Copy of the 1982 Stock Option Plan. (Note 2)
 

 

 


  Exhibit
    No.                                 Description
  -------                               -----------
        
 (10)e     Copy of Leveraged Employee Stock Ownership Plan. (Note 3)
 
 (10)f     Copy of the company's 1992 Stock Option Plan. (Note 5)
 
 (13)      Copy of the company's 1998 Annual Report to Stockholders.
 
 (18)      Letter re change in accounting principle for the year ended December
           31, 1992. (Note 8)
 
 (21)      Subsidiaries of Registrant at December 31, 1998.
 
 (23)      Consent of Independent Public Accountants.
 
 (24)      Power of Attorney.
 
 (27)      Financial Data Schedule.

 
                             Notes To Exhibit Index
 


 Note
 No.
 ----
   
  1.   Filed with the company's Annual Report on Form 10-K for the year ended
       December 31, 1987, and incorporated herein by reference.
  2.   Filed with the company's Annual Report on Form 10-K for the year ended
       December 31, 1988, and incorporated herein by reference.
  3.   Filed with the company's Annual Report on Form 10-K for the year ended
       December 31, 1989, and incorporated herein by reference.
  4.   Filed with the company's Quarterly Report on Form 10-Q for the quarter
       ended September 30, 1991, and incorporated herein by reference.
  5.   Filed with the company's Quarterly Report on Form 10-Q for the quarter
       ended March 31, 1992, and incorporated herein by reference.
  6.   Filed with the company's Quarterly Report on Form 10-Q for the quarter
       ended September 30, 1992, and incorporated herein by reference.
  7.   Filed with the company's Current Report on Form 8-K filed on April 28,
       1993, and incorporated herein by reference.
  8.   Filed with the company's Annual Report on Form 10-K for the year ended
       December 31, 1992, and incorporated herein by reference.
  9.   Filed with the company's Annual Report on Form 10-K for the year ended
       December 31, 1994, and incorporated herein by reference.
 10.   Filed with the company's Quarterly Report on Form 10-Q for the quarter
       ended June 30, 1995, and incorporated herein by reference.
 11.   Filed with the company's Annual report on Form 10-K for the year ended
       December 31, 1997, and incorporated herein by reference.