CABOT CORP
10-K, 1998-12-23
MISCELLANEOUS CHEMICAL PRODUCTS
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                                 UNITED STATES
                        SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                   FORM 10-K
[X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT
                                    OF 1934
 
                  FOR THE FISCAL YEAR ENDED SEPTEMBER 30, 1998
 
                                       OR
 
          [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934
 
     FOR THE TRANSITION PERIOD FROM                   TO
 
                         COMMISSION FILE NUMBER 1-5667
 
                               CABOT CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                            <C>
                   DELAWARE                                      04-2271897
         (STATE OR OTHER JURISDICTION                          (IRS EMPLOYER
      OF INCORPORATION OR ORGANIZATION)                     IDENTIFICATION NO.)

               75 STATE STREET
            BOSTON, MASSACHUSETTS                                  02109
   (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                      (ZIP CODE)
</TABLE>
 
                                 (617) 345-0100
              (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE)
 
SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:
          COMMON STOCK, $1.00 PAR VALUE PER SHARE:
 
<TABLE>
        <S>                                        <C>
        67,215,250 SHARES OUTSTANDING              BOSTON STOCK EXCHANGE
        AT NOVEMBER 30, 1998                       NEW YORK STOCK EXCHANGE
                                                   PACIFIC EXCHANGE
        PREFERRED STOCK PURCHASE RIGHTS
</TABLE>
 
     Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
Registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes [X] No [ ]
 
     Indicate 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 the Registrant's knowledge, in the definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K.  [ ]
 
     The aggregate market value of the Registrant's common stock held
beneficially or of record by shareholders who are not directors or executive
officers of the Registrant at November 30, 1998, was approximately
$1,821,968,766.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
     Portions of the Registrant's Annual Report to Stockholders for fiscal year
1998 are incorporated by reference in Parts II and IV, and portions of the
Registrant's definitive Proxy Statement for its 1999 Annual Meeting of
Stockholders are incorporated by reference in Part III.
 
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                                     PART I
 
ITEM 1.  BUSINESS
 
                                    GENERAL
 
     Cabot's business was founded in 1882 and incorporated in the State of
Delaware in 1960. The Company has businesses in specialty chemicals and
materials and in energy. The Company and its affiliates have manufacturing
facilities in the United States and more than 20 other countries.
 
     The term "Cabot" as used in this Report refers to Cabot Corporation. The
terms "Company" and "Registrant" mean Cabot and its consolidated subsidiaries.
 
     The description of the Company's businesses is as of September 30, 1998,
unless otherwise noted. Information regarding the Company's revenues and
operating profits by business segment and geographic area appears on pages 21
and 46 through 47 of the Company's Annual Report to Stockholders for the fiscal
year ended September 30, 1998 ("Annual Report") which are incorporated herein by
reference.
 
     During the fiscal year ended September 30, 1998, the Company repurchased
approximately 3.8 million shares of its common stock, $1.00 par value per share
(the "Common Stock"), for the purpose of reducing the total number of shares
outstanding as well as offsetting shares issued under the Company's employee
incentive compensation programs.
 
     Additional information regarding significant events affecting the Company
in its fiscal year ended September 30, 1998, appears in Management's Discussion
and Analysis of Financial Condition and Results of Operations on pages 21
through 29 of the Annual Report.
 
                       SPECIALTY CHEMICALS AND MATERIALS
 
CARBON BLACK
 
     The Company manufactures and sells carbon black, a fine powder. The
Company's carbon black business includes tire blacks, industrial products
(previously referred to as industrial rubber blacks) and special blacks. Carbon
black is used as a reinforcing agent in tires and in industrial products such as
extruded profiles, hoses and molded goods. Non-rubber grades of carbon black,
known as special blacks, are used to provide pigmentation, conductivity and
ultraviolet protection and for other purposes in many specialty applications
such as inks, plastics, cables and coatings. The Company believes that it is the
leading manufacturer of carbon black in the world, with an estimated one-quarter
of the worldwide production capacity and market share of carbon black. The
Company competes in the manufacture of carbon black with three companies having
an international presence and with at least 20 other companies in various
regional markets in which it operates. (See "General," below.)
 
     Carbon black plants owned by the Company are located in Argentina,
Australia, Brazil, Canada, China, the Czech Republic, England, France (two
plants), India, Indonesia (two plants), Italy, Japan, The Netherlands, Spain and
the United States (four plants). Affiliates of the Company own carbon black
plants in Colombia, Japan (two plants), Malaysia, Mexico and Venezuela.
Headquarters for the Company's carbon black business are located in Billerica,
Massachusetts, with regional headquarters in Atlanta, Georgia (North America),
Sao Paulo, Brazil (South America), Suresnes, France (Europe) and Kuala Lumpur,
Malaysia (Pacific Asia). Some of the plants listed above are built on leased
land (see "Properties," below). The recent economic crisis in Asia resulted in
the Company's halting production at its Merak facility, one of the two it owns
in Indonesia. (See "Management's Discussion and Analysis of Financial Condition
and Results of Operations -- Special Items," on pages 22 through 23 of the
Annual Report.)
 
     The principal raw materials used in the manufacture of carbon black are
carbon black oils derived from petroleum refining operations and from the
distillation of coal tars and the production of ethylene throughout the world.
The availability of raw materials has not been and is not expected to be a
significant factor for the
 
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business. Raw material costs are influenced by the cost and availability of oil
worldwide and the availability of various types of carbon black oils.
 
     Sales are generally made by employees of the Company or its affiliates in
the countries where carbon black plants are located. Export sales are generally
made through distributors or sales representatives in conjunction with Company
employees. Sales are made under various trademarks owned by Cabot, including
Cabot(R), Black Pearls(R), Elftex(R), Mogul(R), Monarch(R), Regal(R),
Spheron(TM), Sterling(R) and Vulcan(R). (See "General," below.)
 
     The Company's carbon black business continues to pursue a dual strategy of
cost improvement and new product development. The Company is currently
reconfiguring its manufacturing management organization to help speed the
implementation of best manufacturing practices. Additionally, the Company has
several ongoing carbon black new product initiatives. Over the past twelve
months, management has more narrowly focused the carbon black new product
development projects to include only projects that have significant customer
involvement or sponsorship. Generally, the carbon black new products targeting
the tire market have taken longer to commercialize than management anticipated.
For example, during 1998, the anticipated commercialization timetable for the
elastomer composites initiative was extended when initial tire road tests proved
inconclusive on certain performance characteristics of the elastomer composites
product. The Company believes it has identified the reasons why the product did
not exhibit the anticipated performance characteristics and is making those
process changes it believes are necessary to produce a product with the desired
attributes. Once those process changes are made, additional road tests will be
performed to further examine the product's performance and commercial viability.
The Company's management continues to believe that the combination of effective
cost and capacity management and the commercialization of new product
initiatives will provide earnings growth opportunities for the carbon black
business over the next several years.*
 
FUMED SILICA
 
     The Company manufactures and sells fumed silica and dispersions thereof
under various trademarks including Cabot(R), Cab-O-Sil(R) and Cab-O-Sperse(R).
Fumed silica is an ultra-fine, high-purity silica produced by a flame process
for use as a reinforcing, thickening, thixotropic, suspending or anti-caking
agent in a wide variety of products for the automotive industry, construction
industry and consumer products industries, including adhesives, cosmetics, inks,
silicone rubber, coatings and pharmaceuticals. The headquarters for the
Company's fumed silica business are located in Naperville, Illinois and its
North American fumed silica manufacturing plant is located in Tuscola, Illinois.
The Company leases a manufacturing plant in Wales and owns a manufacturing plant
in Germany; prior to October 1997, the plant in Germany was owned by a joint
venture in which the Company held a 50% interest. In addition, a joint venture
owned 50% by the Company and 50% by an Indian entity owns a plant in India,
which began operations in the spring of 1998. The Company began construction in
the summer of 1997 of a second fumed silica plant in the United States, to be
located in Midland, Michigan. Raw materials for the production of fumed silica
are various chlorosilane feedstocks. The feedstocks are either purchased or toll
converted for owners of the materials. The Company has long-term procurement
contracts in place for its plants in Germany and Wales, which it believes will
enable it to meet its raw material requirements for those plants. The Company
does not anticipate difficulty in obtaining raw materials for its Tuscola,
Illinois plant in the foreseeable future. Sales of fumed silica products are
made by Company employees and through distributors and sales representatives.
There are five principal producers of fumed silica in the world. (See "General,"
below.) The Company believes it is the leading producer and seller of this
chemical in the United States and second worldwide.
 
MICROELECTRONICS MATERIALS
 
     The Company manufactures and sells high-purity polishing compounds, made
from fine metal oxide particles and a variety of chemistries. The polishing
materials are used in the manufacture of multi-layer integrated circuit chips
and other electronic devices by the semiconductor industry. These products are
sold under various Cabot trademarks including Cab-O-Sperse(R) and
Semi-Sperse(R). Sales of polishing compounds are made by Company employees and
through distributors and sales representatives. Raw materials, a
 
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significant portion of which are manufactured by the Company's fumed silica
business, are readily available. The Company has a dispersion manufacturing
facility and laboratory in Aurora, Illinois, and a dispersion manufacturing
facility in Barry, Wales. Construction of a third dispersion manufacturing
facility in Geino, Japan was recently completed and is expected to begin
production in January of 1999, with sales anticipated in April of 1999. In
addition, the Company has dispersions mixed for it by a contract manufacturer in
Hammond, Indiana. The headquarters and technology center for the Company's
microelectronics materials business are located in Aurora, Illinois. The Aurora,
Illinois facility provides quality control management, operations management,
marketing support and customer sales and service for the Company's
microelectronics materials business.
 
PLASTICS
 
     The Company produces black and white thermoplastic concentrates and
specialty compounds for sale to plastic resin producers and the plastics
processing industry. Sales are made under various Cabot trademarks including
Cabelec, Plasadd, Plasblak, Plastech, Plaswite and Rainbow, each of which is
either registered or pending in one or more countries. Major applications for
these materials include pipe and tubing, packaging and agricultural film,
automotive components, cable sheathing and special packaging for use in the
electronics industry. Sales are made by Company employees and through sales
representatives and distributors primarily in Europe and Asia. This business has
manufacturing facilities in Belgium (two plants), England, Hong Kong and Italy,
and its headquarters are located in Leuven, Belgium. In Europe, the Company is
one of the three leading producers of thermoplastic concentrates. The main raw
materials used in this business are carbon black, titanium dioxide,
thermoplastic resins and mineral fillers. Raw materials are, in general, readily
available.
 
PERFORMANCE MATERIALS
 
     The Company produces tantalum, niobium (columbium) and their alloys for the
electronic materials and refractory metals industries, and cesium, germanium,
rubidium and tellurium for a wide variety of industries including the fiber
optics and specialty chemicals industries. Tantalum is produced in various forms
including powder and wire for electronic capacitors. Tantalum and niobium and
their alloys are also produced in wrought form for non-electronic applications
such as chemical process equipment and the production of superalloys, and for
various other industrial and aerospace applications. Tantalum produced by the
Company is also used in ballistic munitions by the defense industry. The
headquarters and principal manufacturing facility for this business are in
Boyertown, Pennsylvania. An affiliate of the Company has a manufacturing plant
in Japan. Raw materials are obtained by the Company from ores mined principally
in Africa, Australia, Brazil and Canada and from by-product tin slags from tin
smelting mainly in Malaysia and Thailand. Raw materials are currently in
adequate supply. The Company is presently seeking new sources of tantalum
supply, or an expansion of current sources, to support future demand. Sales in
the United States are made by Company employees, with export sales to Europe
handled by Company employees, independent European sales representatives and an
affiliated company. Sales in Japan and other parts of Asia are handled primarily
through employees of the Company's Japanese affiliate. There are currently two
principal groups producing tantalum and niobium in the western world, with an
emerging competitor in China. The Company believes that it, together with its
Japanese affiliate, is the leading producer of electronic grade tantalum powder
products, with competitors having greater production in some other product
lines. (See "General," below.)
 
INKJET COLORANTS
 
     The Company's inkjet colorants business, which was formed in 1996,
manufactures black colorant products for use in inkjet printing applications.
The Company's pigment-based black colorants are designed to replace traditional
pigment dispersions and dyes. These colorants deliver enhanced color, stability,
durability, ink formulation flexibility and high print quality. These new
products will target various printing markets, including home and office
printers, wideformat printers, and commercial and industrial printing
applications. The headquarters of this business are located in Billerica,
Massachusetts. Raw materials for this business include carbon black, as well as
other products, some of which are custom manufactured, from various sources. The
Company does not anticipate any difficulties in obtaining those raw materials
that are custom
 
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manufactured for its inkjet business, and believes that all other raw materials
for this business are in adequate supply. Management believes that the Company's
colorants will become integral components of certain inkjet printing systems to
be introduced to the market within the next twelve to eighteen months.*
 
SPECIALTY FLUIDS
 
     The Company's specialty fluids business is developing cesium brine to be
marketed as a drilling and completion fluid for use in high temperature and high
pressure drilling of oil and gas wells. Cesium brine has a high density but,
because it has no solid additives, it has a low viscosity permitting it to flow
readily. The fluid is resistant to high temperatures and yet it is
biodegradable. The Company has been shipping the fluid to Aberdeen, Scotland in
anticipation of commercial testing of this product in the North Sea. Such
testing is expected to begin in the first half of fiscal year 1999. If such
tests yield positive results, the Company expects market acceptance such that
the business will become profitable in 1999.* The specialty fluids business has
its headquarters in The Woodlands, Texas and a cesium brine manufacturing
facility near its mine in Manitoba, Canada. The principal raw material used in
this business is pollucite ore, which the Company obtains from that mine. The
Company has an adequate cesium supply. Because each job for which a customer
will rent/lease the cesium brine requires a large volume of the product, the
specialty fluids business must carry a large inventory. Based on its current
information, the Company expects to reclaim between 60% and 90% of the cesium
brine used in each job, which will be returned to inventory.
 
GENERAL
 
     The Company owns and is a licensee of various patents, which expire at
various times, covering many products, processes and product uses of the
Company's specialty chemicals and materials businesses. Although the products
made and sold under these patents and licenses are important to the Company, the
loss of any particular patent or license would not materially affect the
Company's specialty chemicals and materials businesses, taken as a whole. The
Company sells its specialty chemicals and materials products under a variety of
trademarks, the loss of any one of which would not materially affect the
Company's specialty chemicals and materials businesses, taken as a whole.
 
     Many of the Company's specialty chemicals and materials businesses are
generally not seasonal in nature, although they experience some decline in sales
in the fourth fiscal quarter due to European summer plant shutdowns. The Company
believes that as of September 30, 1998, approximately $108.6 million of backlog
orders for its specialty chemicals and materials businesses were firm, compared
to firm backlog orders as of September 30, 1997, of approximately $105.6
million. All of the 1998 backlog orders are expected to be filled during fiscal
year 1999.
 
     Many of the Company's specialty chemicals and materials are used in
products associated with the automotive industry such as tires, extruded
profiles, hoses, molded goods, capacitors and paints. The Company's financial
results are affected by the cyclical nature of the automotive industry, although
a large portion of the market is for replacement tires and other parts which are
less subject to automobile industry cycles. The Company has long-term carbon
black supply contracts with certain of its North American tire customers. Those
contracts are designed to provide such customers with a secure supply of carbon
black and reduce the volatility in the Company's carbon black volumes and
margins caused, in part, by automobile industry cycles.
 
     Six major tire and rubber companies operating worldwide, several special
blacks customers operating in Europe and the United States, one fumed silica
customer operating in Europe and the United States and one capacitor materials
customer represent a material portion of the total net sales and operating
revenues of the Company's specialty chemicals and materials businesses; the loss
of one or more of these customers might materially adversely affect the
Company's specialty chemicals and materials businesses, taken as a whole. The
largest customer of the Company's fumed silica business, Dow Corning Corp.,
filed for protection against its creditors under the bankruptcy laws in 1995.
That filing is not expected to have a material adverse effect on the Company's
fumed silica business.
 
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     Competition in the specialty chemicals and materials businesses is based on
price, service, quality, product performance and technical innovation.
Competitive conditions also necessitate carrying an inventory of raw materials
and finished goods in order to meet customers' needs for prompt delivery of
products. Competition in quality, service, product performance and technical
innovation is particularly significant for the fumed silica, industrial
products, special blacks, inkjet colorants, microelectronics materials and
tantalum businesses. The Company's competitors in the specialty chemicals and
materials businesses, other than the carbon black business, vary by product
group.
 
                                     ENERGY
 
     The Company, through its wholly owned subsidiary, Cabot LNG Corporation,
purchases liquefied natural gas ("LNG") from foreign suppliers, and stores and
resells it in both vapor and liquid form in the northeast United States through
a terminal facility in Everett, Massachusetts. The headquarters for this
business are located in Boston, Massachusetts.
 
LNG SUPPLIES
 
     The Company's LNG supplies currently come primarily from Sonatrading, an
affiliate of Sonatrach, the Algerian national oil and gas company, under a
long-term and a medium-term supply contract. Cabot and Sonatrach have each
agreed to assure performance of the obligations of their respective affiliates
under these agreements. The Company is not able to predict, at this time, what,
if any, impact the political instability in Algeria may have on the future
supply of LNG from Sonatrading, but, to date, the Company has experienced no
direct adverse effect. In the short-term, the loss of supply from the Algerian
supplier could have a material adverse effect on the Company's energy business
until the Trinidad LNG project, described below, commences commercial
operations.
 
     During the past two years, the Company also purchased LNG from ADGAS, an
LNG exporter in the United Arab Emirates, and from the North West Shelf project
in Australia. Beginning in the second half of fiscal 1999, the Company expects
to purchase substantial quantities of LNG from the Trinidad LNG project,
described below.
 
THE TRINIDAD LNG PROJECT
 
     A consortium of companies consisting of Amoco Trinidad (LNG) B.V., British
Gas Trinidad LNG Limited, Cabot Trinidad LNG Limited ("Cabot Trinidad," a wholly
owned subsidiary of Cabot LNG Corporation), NGC Trinidad and Tobago LNG Limited
and Repsol International Finance B.V. are shareholders of Atlantic LNG Company
of Trinidad and Tobago ("Atlantic LNG"), a corporation formed to construct, own
and operate a new LNG liquefaction plant in the Republic of Trinidad and Tobago.
Cabot Trinidad owns 10% of Atlantic LNG. The plant is designed to export 385
million cubic feet of natural gas per day in the form of LNG. Cabot LNG
Corporation and Enagas, S.A., the largest importer and wholesaler of natural gas
in Spain, have entered into contracts with Atlantic LNG under which Cabot LNG
Corporation will purchase 60% and Enagas, S.A. will purchase the remaining 40%
of the LNG to be produced by Atlantic LNG's new plant. The plant is currently
under construction and is expected to be completed and deliveries of LNG to
commence in fiscal year 1999.
 
     In June 1997, Atlantic LNG concluded a $600 million limited recourse
financing with a consortium of international banks to provide funds for the
construction of the new liquefaction plant, for which the Company, as well as
the other Atlantic LNG shareholders or their respective affiliates, have issued
limited completion guarantees. The plant construction is proceeding on schedule
and on budget and the Atlantic LNG shareholders are presently evaluating an
expansion of the facility.
 
OTHER EXPANSION ACTIVITIES
 
     The Company expects to complete the refurbishment of its LNG tanker, now
renamed the Matthew, and to bring it into service in early fiscal 1999. The
Company expects to use the Matthew to transport LNG supplies from the Trinidad
LNG project. The Company is also expanding its terminal in Everett to vaporize
an
 
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additional 150 million cubic feet of natural gas per day, an approximate 50%
increase in capacity. That expansion is presently under way and is scheduled to
be completed in the first quarter of fiscal 1999.
 
MARKETS
 
     The Company markets LNG to local gas distribution companies, natural gas
marketers and electric generators. These markets are characterized by
substantial price competition and numerous competitors, including natural gas
suppliers and suppliers of alternative fuels. Sales are stronger in the winter
months because of heating demands in New England.
 
     Both the natural gas and the electric businesses in the northeast United
States are in the process of being deregulated and restructured, thereby making
them subject to greater competition. This restructuring may cause significant
changes in the Company's LNG customer base, including a shift in the
responsibility for gas supplies from the local gas distribution companies to
natural gas marketers.
 
                                     OTHER
 
     As of September 30, 1998, the Company owned approximately 650,000 shares of
common stock, $5.00 par value per share (approximately 1.4% of the then
outstanding shares), of K N Energy, Inc. ("KNE"). The Company has reflected its
investment in the common stock of KNE at its fair market value on September 30,
1998.
 
     As of September 30, 1998, the Company owned 7.5 million shares of common
stock, AUD 0.25 par value per share (approximately 6.7% of the then outstanding
shares), of Sons of Gwalia Ltd. ("Gwalia"). The Company has reflected its
investment in the common stock of Gwalia at its fair market value on September
30, 1998.
 
     The Company has maintained an approximate 41.4% ownership interest in Aearo
Corporation (formerly Cabot Safety Holdings Corporation) after the restructuring
of the Company's safety products and specialty composites business in July 1995.
The Company has two representatives serving on the Board of Directors of Aearo
Corporation and its principal subsidiaries ("Aearo"). Aearo manufactures and
sells personal safety products, as well as energy absorbing, vibration damping
and impact absorbing products for industrial noise control and environmental
enhancement.
 
                               OTHER INFORMATION
 
EMPLOYEES
 
     As of September 30, 1998, the Company had approximately 4,800 employees.
Approximately 560 employees in the United States are covered by collective
bargaining agreements. The Company believes that its relations with its
employees are satisfactory.
 
RESEARCH AND DEVELOPMENT
 
     The Company develops new and improved products and processes and greater
operating efficiencies through Company-sponsored research and technical service
activities including those initiated in response to customer requests.
Expenditures by the Company for such activities are shown on page 32 of the
Annual Report, which is incorporated herein by reference.
 
SAFETY, HEALTH AND ENVIRONMENT
 
     The Company's operations are subject to various environmental laws and
regulations. Over the past several years, the Company has expended considerable
sums to add, improve, maintain and operate facilities for environmental
protection.
 
     The Company has been named as a potentially responsible party under the
Comprehensive Environmental Response, Compensation, and Liability Act of 1980
(the "Superfund law") with respect to several sites. (See "Legal Proceedings,"
below.) During the next several years, as remediation of various environmental
 
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sites is carried out, the Company expects to spend a significant portion of its
$35.6 million environmental reserve for costs associated with such remediation.
Additions are made to the reserve based on the Company's continuing analysis of
its share of costs likely to be incurred at each site. The sites are primarily
associated with divested businesses.
 
     In 1996, the International Agency for Research on Cancer ("IARC") revised
its evaluation of carbon black from Group 3 (insufficient evidence to make a
determination regarding carcinogenicity) to Group 2B (known animal carcinogen,
possible human carcinogen), based solely on results of studies of female rat
responses to the inhalation of carbon black. The Company has communicated this
change in IARC's evaluation of carbon black to its customers and employees and
has made changes to its material safety data sheets and elsewhere, as
appropriate. The Company continues to believe that available evidence, taken as
a whole, indicates that carbon black is not carcinogenic to humans, and does not
present a health hazard when handled in accordance with good housekeeping and
safe workplace practices as described in the Company's material safety data
sheets.
 
*FORWARD LOOKING INFORMATION
 
     Included herein are statements relating to management's projections of
future profits, the possible achievement of the Company's financial goals and
objectives, management's expectations for the Company's product development
program, Year 2000 risks and the impact of the euro conversion. Actual results
may differ materially from the results anticipated in the statements included
herein due to a variety of factors including market supply and demand
conditions, fluctuations in currency exchange rates, cost of raw materials,
patent rights of others, Year 2000 disruptions, demand for the Company's
customers' products and competitors' reactions to market conditions. Timely
commercialization of products under development by the Company may be disrupted
or delayed by technical difficulties, market acceptance or competitors' new
products, as well as difficulties in moving from the experimental stage to the
production stage. The risk management discussion and the estimated amounts
generated from the analyses are forward-looking statements of market risk
assuming certain adverse market conditions occur. Actual results in the future
may differ materially from these projected results due to actual developments in
the global financial markets. The methods used by the Company to assess and
mitigate risks should not be considered projections of future events or losses.
 
FINANCIAL INFORMATION ABOUT INDUSTRY SEGMENTS, FOREIGN AND DOMESTIC OPERATIONS
AND EXPORT SALES
 
     Industry segment financial data are set forth in tables on pages 21 and 46
through 47 of the Annual Report and are incorporated herein by reference. A
significant portion of the Company's revenues and operating profits is derived
from overseas operations. The profitability of the specialty chemicals and
materials businesses is affected by fluctuations in the value of the U.S. dollar
relative to foreign currencies. The Company's overseas operations do not
currently include any energy-related businesses. (See Note P of the Notes to
Consolidated Financial Statements for further information relating to sales and
profits by geographic area and "Management's Discussion and Analysis of
Financial Condition and Results of Operations," appearing on pages 46 through 47
and pages 21 through 29, respectively, in the Annual Report and incorporated
herein by reference.) Currency fluctuations and nationalization and
expropriation of assets are risks inherent in international operations. In
addition, the recent economic crisis in Asia has reduced volumes and profits of
the Company's carbon black and plastics businesses in that region. The Company
has taken steps it deems prudent in its international operations to diversify
and otherwise to protect against these risks, including the purchase of forward
foreign currency contracts and options to reduce the risk associated with
changes in the value of certain foreign currencies compared to the U.S. dollar.
(See "Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Risk Management" and Note O of the Notes to the Consolidated
Financial Statements on pages 25 through 26 and 45 through 46, respectively, of
the Annual Report.)
 
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ITEM 2.  PROPERTIES
 
     The Company owns, leases and operates office, manufacturing, production,
storage, marketing and research and development facilities in the United States
and in foreign countries.
 
     The principal facilities of the Company's business units are described
generally in Item 1 above.
 
     The principal facilities owned by the Company in the United States are: (i)
the administrative offices and manufacturing plants of its carbon black
operations in Louisiana, Massachusetts, Texas and West Virginia (comprising
approximately 9,342,000 square feet); (ii) its research and development
facilities in Illinois, Massachusetts and Pennsylvania and its applications
development facility in Georgia (collectively comprising approximately 112,800
square feet); (iii) administrative offices and manufacturing plants of its fumed
silica and microelectronics materials businesses in Illinois and its performance
materials business in Pennsylvania (comprising approximately 601,300 square
feet); and (iv) its LNG terminalling and storage facility in Massachusetts
(comprising approximately 37,700 square feet).
 
     The Company's principal foreign owned facilities are held through
subsidiaries and together they comprise approximately 7,230,500 square feet of
manufacturing facilities, 39,400 square feet of research and development
facilities, and 923,000 square feet of administrative offices. Portions of the
owned facilities in the Czech Republic, France, Japan and Spain, and all of the
owned facilities in China, Hong Kong, India, Indonesia and The Netherlands are
located on leased land.
 
     The principal facilities leased by the Company in the United States are its
corporate headquarters in Boston, Massachusetts, and its carbon black
administrative offices in Georgia (collectively comprising approximately 107,600
square feet). The principal facilities leased by subsidiaries in locations
outside the United States are administrative offices and manufacturing
facilities of the fumed silica and microelectronics materials businesses in
Wales, administrative offices and research and development facilities of the
carbon black operations in France and Malaysia, and administrative offices and
manufacturing facilities of the specialty fluids business in Canada
(collectively comprising approximately 305,925 square feet). In addition, the
Company holds mining rights in Canada.
 
     The Company's administrative offices are generally suitable and adequate
for their intended purposes. Existing manufacturing facilities of the Company
are not sufficient to meet the Company's anticipated requirements for the future
and are being supplemented by additional production facilities in several
locations inside and outside the United States. The Company is currently
constructing a new plant to produce fumed silica in Midland, Michigan, and is
undertaking projects to expand carbon black production capacity in China, India
and The Netherlands.
 
ITEM 3.  LEGAL PROCEEDINGS
 
     The Company is a defendant in various lawsuits and environmental
proceedings wherein substantial amounts are claimed. The following is a
description of the significant proceedings pending as of September 30, 1998,
unless otherwise specified.
 
     Environmental Proceedings
 
     In November 1997, Cabot was sued in the District Court of Potter County,
Texas by K N Energy, Inc. ("KNE") and various related entities for environmental
remediation costs at approximately 45 gas plants and compressor stations located
in New Mexico, Oklahoma and Texas. Cabot sold its subsidiaries that owned those
properties in two separate transactions in 1989, and, in doing so, undertook
certain contractual obligations with respect to environmental conditions at the
properties. KNE alleges to be the assignee of those contract rights and,
pursuant thereto, has attempted to require Cabot to pay for costs KNE has
incurred and will incur in the future to remediate environmental contamination
alleged to be on those properties. In July 1998, an arbitration panel ordered
Cabot to pay $3.38 million for past response costs incurred by KNE as well as an
unspecified amount for prejudgment interest and arbitration costs. KNE contends
that the interest on the past cost award and costs of arbitration amount to
approximately $729,000. Cabot has disputed the interest and a portion of the
cost figures, but has paid KNE the amount awarded for past response costs and
 
                                        8
<PAGE>   10
 
the portion of the arbitration costs not in dispute. The panel also ordered
Cabot to pay up to 80% of future groundwater remediation costs at six of the
sites as such costs are incurred by KNE. Finally, the panel ordered KNE to
ensure that future remedial actions are cost-effective and based on health
risks, with a preference for natural attenuation of contamination. Cabot has
appealed the panel's award of future costs. Future remediation costs are
estimated to be in a range from less than $2 million to up to $8 million. Cabot
and KNE continue to explore settlement of this matter.
 
     In 1994, Cabot and the State of Florida agreed to a settlement of a 1983
state court lawsuit requiring Cabot to pay the State $650,000 in past costs
associated with a site in Gainesville, Florida. Cabot also paid the United
States Environmental Protection Agency ("EPA") $416,000 for costs incurred by
EPA at the site. The site included a parcel of land on which Cabot previously
owned and operated a pine tar distillation plant. Cabot has completed the
implementation of a soil and groundwater remedy at the site in accordance with
applicable requirements and is currently operating and maintaining the
groundwater collection system at the site and monitoring site conditions. Recent
monitoring of the groundwater collection system revealed slightly elevated
levels of certain contaminants. Cabot has until June 30, 1999 to continue to
monitor the levels of these contaminants while the local sewer authority seeks
revisions to its discharge standards that would permit the discharge of the
contaminants at these slightly higher levels. If those revisions are not made,
Cabot will evaluate whether further activities will be necessary to address this
condition. In November 1998, Cabot completed a search which identified the
location of three historic water wells on the property. Oil was discovered in
one well and has been removed. Groundwater samples from the wells have not
identified the presence of significant levels of contamination, although Cabot's
environmental consultant for this site is evaluating the results to determine
whether any further investigation is warranted. Until this evaluation is
completed, it is unknown whether any further action will be necessary. Cabot
plans to decommission the wells it located during this search in accordance with
applicable requirements.
 
     Beginning in May 1986, the Department of Environmental Protection of the
State of New Jersey ("NJDEP") issued directives under the New Jersey Spill
Compensation and Control Act to Cabot and other potentially responsible parties
("PRPs") to fund a remedial investigation for the cleanup of a six acre site in
Old Bridge Township near Perth Amboy, New Jersey. Cabot and other PRPs
contributed funds for a remedial investigation and feasibility study which was
conducted by a consultant to NJDEP. In January 1996, ten companies, including
Cabot, entered into an Administrative Consent Order with NJDEP which required
them to perform an additional study of the site and to handle minor remedial
work. Most of the work required by the 1996 order is complete, and the companies
have submitted the results of their soils investigation to NJDEP. NJDEP has not
determined what, if anything, will be required to address site soils, but the
investigation results indicate that no remediation of site soils is necessary to
eliminate exposure risks. The companies also plan to excavate certain areas of
an adjacent site where NJDEP believes additional material may be buried. In
1997, the companies entered into an Administrative Consent Order with NJDEP
whereby they agreed to contribute costs to an interim groundwater remedy
involving the collection of contaminated groundwater at the site and its
conveyance to a local sewer authority over a two year period pending a final
decision concerning long-term groundwater cleanup. Cabot contributed
approximately $107,000 to the cost of this effort. During the two year period,
the companies are collecting data and evaluating whether a remedy of natural
attenuation for groundwater contamination associated with the site may be
acceptable. Until additional studies are complete, it is not possible to
identify what remediation, if any, will be required at the site, what the total
cost of the remediation will be, or what Cabot's portion of any such costs will
be. Finally, in 1997, Cabot joined with the other parties at the site in
settling claims by CPS Chemical Company, an adjacent property owner, alleging
that contaminated groundwater from the site contaminated its property.
 
     In 1986, Cabot sold a manufacturing facility in Reading, Pennsylvania to
NGK Metals, Inc. ("NGK"). In doing so, Cabot agreed to share with NGK the costs
of certain environmental remediation of the Reading plant site. After the sale,
EPA issued an order to NGK requiring it to address soil and groundwater
contamination at the site. In 1996 and 1997, NGK's contractor completed the soil
remediation component of the work. In August 1997, after completion of the soil
cleanup project, the contractor notified NGK that it had incurred substantial
additional costs over the base contract for the work and that NGK was
responsible for these extra costs. NGK, with support from Cabot, disputed this
claim, and in 1998, the contractor brought suit
 
                                        9
<PAGE>   11
 
against Cabot, NGK and their oversight consultant seeking to recover its cost
overruns from the project. During the soil cleanup project, an area of
additional contamination was discovered by NGK's consultants. The groundwater
remediation component of the work is currently being designed.
 
     Cabot is one of approximately 25 parties identified by EPA as PRPs under
the Superfund law with respect to the cleanup of Fields Brook (the "Brook"), a
tributary of the Ashtabula River in northeast Ohio. From 1963 to 1972, Cabot
owned two manufacturing facilities located beside the Brook. Pursuant to an EPA
administrative order, 13 companies, including Cabot, are performing the design
and other preliminary work relating to remediation of sediment in the Brook and
soil in the floodplain and wetlands areas adjacent to the Brook. In 1997, EPA
and the companies reached agreement on the remedy for these areas, and the
companies' consultants began preparing detailed design documents necessary to
implement this remedy. Subsequent to these events, investigations have detected
low levels of previously undetected radioactive material in sediment in the
Brook, and EPA conducted further investigations of that issue. EPA's
investigation confirmed the presence of this contamination, and EPA has informed
the companies involved in the site that the presence of this radioactive
material will require changes to the remedy EPA previously approved for the
site. It is unclear at this time what those changes will be and what the cost
impact of any changes might be. Remedial activities are likely to be delayed as
a result of the recent findings, and are unlikely to occur prior to 2000. EPA's
cost recovery claims through the end of 1989 have been settled, and the
companies have negotiated a consent decree with EPA and the Natural Resource
Trustees that settles the government's claims for past costs and natural
resource damages and obligates the companies to implement the agreed remedy.
This consent decree has not been finalized pending resolution of the issues
concerning the newly-discovered radioactive material. Cabot's share of the
settlement amount is approximately $585,000; Cabot's estimated share of future
remediation costs based on the original remedy is approximately $5.5 million. It
is not clear how the additional radioactive material will affect these figures.
The companies, including Cabot, that have paid for work at the site are seeking
to recover a share of those costs from other responsible parties.
 
     In 1997, Cabot and the other parties responding to EPA requirements at the
Brook reached a conditional agreement to contribute funds to the Ashtabula River
Partnership to assist the Partnership in its efforts to dredge and remediate
sediments in the Ashtabula River downstream from the Brook. If the Partnership
is successful, this work will be conducted outside the traditional federal
Superfund law process through a public-private consortium that will involve
substantial public sources of funding for the work. If such sources, along with
additional private funds, become available, it is expected to be less expensive
and easier to complete the project than it would to address the issues involving
the Ashtabula River pursuant to the traditional Superfund law process.
 
     In 1994, Detrex Chemical Industries, Inc. filed third-party complaints
against eight companies, including Cabot, in connection with material allegedly
sent to the Koski/RES landfill in Ashtabula, Ohio. Cabot and other third-party
defendants filed complaints against five additional companies that sent waste to
the site. In May 1998, Cabot and certain other defendants agreed to settle their
liability for this matter by agreeing to fund and conduct a portion of the
remedy at the landfill site and to loan RES $1.2 million to fund cleanup
activities of RES on other portions of the site. Cabot is one of five of the
settling defendants that agreed to conduct the work; the others made one-time
cash payments to resolve their liabilities at the site. Cabot anticipates that
the cost of the settlement to Cabot, including the loan to RES, is approximately
$600,000.
 
     Cabot is the holder of a Nuclear Regulatory Commission ("NRC") license for
certain slag waste material deposited on industrial property on Tulpehocken
Street in Reading, Pennsylvania in the late 1960s by a predecessor of Cabot that
had leased a portion of the site to process tin slags. The slag material
contains low levels of uranium and thorium, thus subjecting it to NRC
jurisdiction. A consultant for Cabot has prepared a site decommissioning plan
for the slag material which concludes that the levels of radioactivity in the
slag are low enough that the material can be safely left in place and still meet
NRC requirements for license termination without restrictions. Cabot's
decommissioning plan proposing this in-place remedy was filed with the NRC in
late August 1998. The current owner of the Tulpehocken Street site, the City of
Reading and the Reading Redevelopment Authority have filed requests for a
hearing with the NRC concerning Cabot's decommissioning plan alleging various
deficiencies with the plan. Cabot has discussed its decommissioning plan with
these parties and continues to explore settlement discussions with them
concerning their claims.
                                       10
<PAGE>   12
 
     In July 1991, EPA instituted litigation against a number of parties, not
including Cabot, seeking to recover its costs incurred in connection with an
investigation of the Berks Associates Superfund Site in Douglassville,
Pennsylvania. Cabot was joined in this litigation as a third-party defendant.
The litigation has been stayed pending settlement negotiations. In April 1996,
EPA proposed that ten companies, including Cabot, undertake the remaining
remediation required at the site and indicated it would be willing to
reconsider, to some extent, the remediation technology to be used. An
administrative consent order to conduct a Focused Feasibility Study ("FFS") of
the practicability of the alternative remedy (materials stabilization and
containment in lieu of incineration) was entered into by the companies and EPA
in September 1997. Cabot contributed $26,000 to the cost of this study. The FFS
was completed and submitted to EPA in 1998. The FFS concludes that the
alternative remedy is feasible, and the companies' consultant estimates the cost
to implement the alternative remedy at the site is approximately $13 to $18
million. EPA is in the process of negotiating a Consent Decree with the
companies concerning implementation of the alternative remedy. EPA also has
indicated that it has incurred $23 million in past costs at the site. A
consultant hired by the companies has estimated that Cabot's volumetric share of
waste shipped to the site is much less than 1% of the total volume of waste
shipped to the site. As such, while Cabot is unsure of what its total cost will
be to settle EPA's claims and fund remediation at the site, it anticipates that
such cost should be a small fraction of the total costs incurred by the
defendants at the site.
 
     In 1994, five plaintiffs filed suit in the U.S. District Court for the
Eastern District of Pennsylvania against 24 defendants, including Cabot, under
the Superfund law and state law seeking recovery of remediation costs at the
Berks Landfill site, which is located in the vicinity of Reading, Pennsylvania.
The plaintiffs claim that a beryllium alloy plant formerly owned by Cabot and
located in Reading, Pennsylvania sent waste to the Berks Landfill. The
plaintiffs claim to have incurred approximately $3 million on investigations and
interim remedial measures at the site. In 1997, EPA issued a Record of Decision
("ROD") for the site. The ROD selected as a remedy the repair and maintenance of
an existing cap at the landfill, the operation and maintenance of a leachate
management system, long-term monitoring of groundwater and implementation of
deed restrictions at the site. EPA estimates the 30-year present net worth of
these measures at approximately $6 million. In September 1997, EPA issued
special notice letters to Cabot and approximately 30 other parties requesting
them to enter into negotiations to implement the ROD. When those negotiations
failed, EPA issued Unilateral Administrative Orders ("UAO") to a number of the
companies requiring them to implement the ROD. Cabot did not receive the UAO,
and it has been informed by EPA that it has been included in a group of
companies EPA believes will be eligible for a de minimis settlement for this
site. EPA has not yet offered this group of companies the de minimis settlement,
but the companies expect to receive one in 1999. It is not possible at this time
to determine the amount Cabot will be required to contribute to settle EPA's and
the plaintiffs' costs at the site.
 
     In 1994, EPA issued a Unilateral Administrative Order to Cabot and 11 other
respondents pursuant to the Superfund law with respect to the Revere Chemical
Site (a/k/a Echo Site) in Nockamixon Township, Bucks County, Pennsylvania (the
"Revere Chemical Site"). The order required the respondents to design and
implement several remedial measures at the Revere Chemical Site. Cabot responded
to EPA's order by indicating that it should not have been named as a respondent
and by raising several objections to the order. Certain other recipients of the
order proceeded to conduct the work required by EPA, and Cabot understands that
work has been partially completed. Cabot has been informed by the parties
performing the work that the total cost of remediation activities at the site is
estimated to be approximately $12.2 million, not including approximately
$600,000 in past EPA enforcement costs. Cabot has initiated communication with
the parties that conducted the work in order to explore whether settlement of
Cabot's liability for the costs incurred by the parties and by EPA at the site
may be feasible. Those discussions are continuing, and it is not possible to
estimate Cabot's share of those costs at this time.
 
     In July 1998, EPA informed Cabot that it will be undertaking corrective
action under the Resource Conservation and Recovery Act at Cabot's facility in
Boyertown, Pennsylvania. The Army Corps of Engineers performed a site visit in
September 1998 to initiate this action. It is unclear at this time what
corrective action, if any, will be required at the site and what costs Cabot may
incur as a result.
 
                                       11
<PAGE>   13
 
     In October 1998, the Direction Regionale de L'Industrie, de la Recherche et
de L'Environment ("DRIRE") and the Prefecture de la Seine-Maratime (the
"Prefecture") notified United Chemical France, S.A. ("UCF"), a French subsidiary
of Cabot, that DRIRE planned to seek an order (the "Proposed Order") from the
Prefecture requiring UCF to undertake an initial investigation of a waste dump
allegedly operated by UCF from the mid-1960s to the early 1980s in the Town of
Notre Dame de Gravenchon. The Prefecture issued a draft order to UCF dated
November 19, 1998, requiring an investigation of the former waste dump. UCF
responded to the draft order by submitting formal comments, noting that it is
not the proper party to address conditions at the dump as it is currently being
used by the Town of Notre Dame de Gravenchon for waste disposal. A final order
has not been issued as of December 14, 1998. When Cabot purchased UCF in 1985,
the seller indemnified Cabot for matters relating to events occurring prior to
the sale, including environmental matters. Cabot has notified the seller that
Cabot believes that the indemnification would cover costs related to the
Proposed Order.
 
     Cabot, along with a number of other companies, was a PRP under the
Superfund law with respect to the King of Prussia Technical Corp. site in
Winslow Township, New Jersey. Work on site remediation was completed several
years ago except for ongoing operation and maintenance of groundwater treatment
facilities. Cabot and four other companies involved have agreed on the portions
of the costs to be borne by each company. In December 1998, EPA advised one of
the companies that EPA intends to assert a claim in January 1999 for past
oversight costs of approximately $4.1 million. As of December 14, 1998, Cabot
had not received any formal notification of this claim from EPA.
 
     Cabot has received various requests for information and notifications that
it may be a PRP at several other Superfund sites.
 
     As of September 30, 1998, approximately $35.6 million was accrued for
environmental matters by the Company. The amount represents the Company's
current best estimate of costs likely to be incurred based on its analysis of
the extent of cleanup required, alternative cleanup methods available, abilities
of other responsible parties to contribute and its interpretation of laws and
regulations applicable to each site.
 
     Other Proceedings
 
     The Company has various other lawsuits, claims and contingent liabilities
arising in the ordinary course of its business. In the opinion of the Company,
although final disposition of those suits and claims may impact the Company's
financial statements in a particular period, they should not, in the aggregate,
have a material adverse effect on the Company's financial position. (See Note N
of the Notes to the Company's Consolidated Financial Statements on pages 44
through 45 of the Annual Report.)
 
ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
 
     None.
 
                                       12
<PAGE>   14
 
EXECUTIVE OFFICERS OF THE REGISTRANT
 
     Set forth below for each person who was an executive officer of Cabot at
the end of the 1998 fiscal year, is information, as of November 30, 1998,
regarding his or her age, position(s) with Cabot, the periods during which he or
she served as an officer and his or her business experience during at least the
past five years:
 
<TABLE>
<CAPTION>
            NAME              AGE  OFFICES HELD/BUSINESS EXPERIENCE            DATES HELD
            ----              ---  --------------------------------            ----------
<S>                           <C>  <C>                               <C>
William T. Anderson.........  43   Cabot Corporation
                                   Controller                        September 1997 to present
                                   Acting Corporate Controller
                                   and Assistant Controller          February 1997 to September
                                                                     1997
                                   Assistant Controller              July 1995 to February 1997
                                   Private Eyes Sunglass
                                     Corporation
                                   Chief Operating Officer           1991 to 1995
                                   Chief Financial Officer           1990 to 1991
Samuel W. Bodman............  60   Cabot Corporation
                                   Chairman of the Board             October 1988 to present
                                   President                         February 1991 to February 1995
                                                                     January 1987 to October 1988
                                   Chief Executive Officer           February 1988 to present
Kennett F. Burnes...........  55   Cabot Corporation
                                   President                         February 1995 to present
                                   Chief Operating Officer           March 1996 to present
                                   Executive Vice President          October 1988 to February 1995
Winfred R. Cates............  58   Cabot Corporation
                                   Senior Vice President             May 1996 to December 31, 1998
                                   Vice President                    May 1990 to May 1996
Robert L. Culver............  50   Cabot Corporation
                                   Executive Vice President and
                                   Chief Financial Officer           April 1997 to present
                                   Northeastern University
                                   Senior Vice President and
                                   Treasurer                         October 1990 to April 1997
Catharine M. de Lacy........  40   Cabot Corporation
                                   Vice President                    April 1998 to present
                                   Allied Signal, Inc.
                                   Vice President, Health, Safety,
                                   Environment and Remediation       April 1995 to April 1998
                                   Occidental Petroleum Corporation
                                   Vice President, Health, Safety,
                                   Environment and Risk
                                   Management                        April 1993 to April 1995
William P. Noglows..........  40   Cabot Corporation
                                   Executive Vice President          March 1998 to present
                                   Vice President                    February 1994 to March 1998
                                   Director of Global
                                   Manufacturing                     November 1997 to present
                                   General Manager, Cab-O-Sil
                                   Division                          November 1992 to November 1997
Robert Rothberg.............  49   Cabot Corporation
                                   Vice President and
                                   General Counsel                   October 1993 to present
</TABLE>
 
                                       13
<PAGE>   15
 
<TABLE>
<CAPTION>
            NAME              AGE  OFFICES HELD/BUSINESS EXPERIENCE            DATES HELD
            ----              ---  --------------------------------            ----------
<S>                           <C>  <C>                               <C>
Roland R. Silverio..........  51   Cabot Corporation
                                   Vice President                    May 1998 to present
                                   Director of Organizational
                                   Development                       January 1998 to present
                                                                     October 1992 to October 1995
                                   Manager of Training and
                                   Development                       July 1990 to October 1992
                                   The Franklin Group
                                   Managing Partner                  October 1995 to January 1998
Donald R. Young.............  41   Cabot Corporation
                                   Executive Vice President          March 1998 to present
                                   Vice President                    September 1993 to March 1998
                                   General Manager,
                                   Carbon Black                      October 1996 to present
                                   Director of Carbon Black
                                     Marketing and
                                   General Manager of Global
                                   Tire Sector                       January 1996 to October 1996
                                   General Manager, Pacific Asia
                                   Carbon Black                      August 1993 to December 1995
                                   Director of Cogeneration
                                   Projects, Carbon Black            September 1992 to August 1993
</TABLE>
 
                                    PART II
 
ITEM 5.  MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER
MATTERS
 
     Cabot's Common Stock is listed for trading (symbol CBT) on the New York,
Boston, and Pacific stock exchanges. As of September 30, 1998, there were
approximately 2,055 holders of record of Cabot's Common Stock. The price range
in which the stock has traded, as reported on the composite tape, and the
quarterly cash dividends for the past two years are shown below.
 
STOCK PRICE AND DIVIDEND DATA
 
<TABLE>
<CAPTION>
                                             DECEMBER    MARCH      JUNE     SEPTEMBER     YEAR
                                             --------    ------    ------    ---------    ------
<S>                                          <C>         <C>       <C>       <C>          <C>
FISCAL 1998
Cash dividends per share...................   $ 0.10     $ 0.10    $ 0.11     $ 0.11      $ 0.42
Price range of common stock:
  High.....................................   $28.19     $39.94    $38.81     $33.38      $39.94
  Low......................................   $23.63     $25.25    $31.06     $21.75      $21.75
  Close....................................   $27.63     $36.88    $32.31     $24.94      $24.94
</TABLE>
 
<TABLE>
<CAPTION>
                                             DECEMBER    MARCH      JUNE     SEPTEMBER     YEAR
                                             --------    ------    ------    ---------    ------
<S>                                          <C>         <C>       <C>       <C>          <C>
FISCAL 1997
Cash dividends per share...................   $ 0.10     $ 0.10    $ 0.10     $ 0.10      $ 0.40
Price range of common stock:
  High.....................................   $29.38     $25.38    $28.56     $29.25      $29.38
  Low......................................   $23.00     $22.63    $21.50     $25.75      $21.50
  Close....................................   $25.13     $24.00    $28.38     $26.94      $26.94
</TABLE>
 
                                       14
<PAGE>   16
 
ITEM 6.  SELECTED FINANCIAL DATA
 
     Cabot Corporation Selected Financial Data:
 
<TABLE>
<CAPTION>
                                                             YEARS ENDED SEPTEMBER 30
                                                ---------------------------------------------------
                                                 1998       1997       1996       1995       1994
                                                -------    -------    -------    -------    -------
                                                  (DOLLARS IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
<S>                                             <C>        <C>        <C>        <C>        <C>
Financial Highlights
  Net sales and other operating revenues......  $1,648     $1,630     $1,856     $1,830     $1,680
                                                ------     ------     ------     ------     ------
  Income before cumulative effect of
     accounting changes.......................  $  122     $   93     $  194     $  172     $   79
                                                ------     ------     ------     ------     ------
  Long-term debt..............................  $  316     $  286     $  322     $  306     $  308
  Minority interest...........................      25         23         27          8         --
  Stockholders' equity........................     706        728        745        685        563
                                                ------     ------     ------     ------     ------
          Total capitalization................  $1,047     $1,037     $1,094     $  999     $  871
                                                ------     ------     ------     ------     ------
          Total assets........................  $1,805     $1,826     $1,857     $1,654     $1,617
                                                ------     ------     ------     ------     ------
Income per common share:
  Basic.......................................  $ 1.80     $ 1.33     $ 2.74     $ 2.29     $ 1.03
  Diluted.....................................  $ 1.61     $ 1.19     $ 2.42     $ 2.03     $ 0.92
  Cash dividends (declared and paid)..........  $ 0.42     $ 0.40     $ 0.36     $ 0.30     $ 0.27
                                                ------     ------     ------     ------     ------
Weighted average common shares outstanding in
  millions (diluted)..........................    74.6       76.7       79.3       83.6       82.7
                                                ------     ------     ------     ------     ------
</TABLE>
 
ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS
 
     The information required appears in the Annual Report on pages 21 through
29 and is incorporated herein by reference.
 
ITEM 7A.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
 
     The information required appears in the Annual Report on pages 25 through
26 and is incorporated herein by reference.
 
ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
 
     The information required appears in the Annual Report on pages 30 through
48 and is incorporated herein by reference.
 
ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS AND ACCOUNTING AND
FINANCIAL DISCLOSURE
 
     None.
 
                                       15
<PAGE>   17
 
                                    PART III
 
ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT
 
     The information required regarding the executive officers of Cabot is
included in Part I in the unnumbered item captioned "Executive Officers of the
Registrant." Certain information required regarding the directors of Cabot is
contained in the Registrant's Proxy Statement for the 1999 Annual Meeting of
Stockholders ("Proxy Statement") under the heading "Certain Information
Regarding Directors." Certain information required regarding the failure of any
person subject to Section 16 of the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), to timely file reports required by Section 16(a) of the
Exchange Act is contained in the Proxy Statement under the heading "Compliance
with Section 16(a) of the Exchange Act." All of such information is incorporated
herein by reference.
 
ITEM 11.  EXECUTIVE COMPENSATION
 
     The information required is contained in the Proxy Statement under the
heading "Executive Compensation." All of such information is incorporated herein
by reference.
 
ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
     The information required is contained in the Proxy Statement under the
heading "Beneficial Stock Ownership of Directors, Nominees, Executive Officers
and Persons Owning More than Five Percent of Common Stock." All of such
information is incorporated herein by reference.
 
ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
     The information required is contained in the Proxy Statement under the
heading "Certain Relationships and Related Transactions." All of such
information is incorporated herein by reference.
 
                                       16
<PAGE>   18
 
                                    PART IV
 
ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K
 
     (a) Financial Statements.  The following are incorporated herein by
reference in this Report from the indicated pages of the Company's Annual
Report:
 
<TABLE>
<CAPTION>
                        DESCRIPTION                             PAGE
                        -----------                             ----
<S>                                                             <C>
(1)  Consolidated Statements of Income for each of the three
     fiscal years in the period ended September 30, 1998....     32
(2)  Consolidated Balance Sheets at September 30, 1998 and
     1997...................................................    30-31
(3)  Consolidated Statements of Cash Flows for each of the
     three fiscal years in the period ended September 30,
     1998...................................................     33
(4)  Notes to Consolidated Financial Statements.............    34-47
(5)  Statement of Management Responsibility for Financial
     Reporting and Report of Independent Accountants
     relating to the Consolidated Financial Statements
     listed above...........................................     48
</TABLE>
 
     (b) Reports on Form 8-K.  None.
 
     (c) Exhibits.  (Not included in copies of the Form 10-K sent to
stockholders.)
 
     The exhibit numbers in the following list correspond to the numbers
assigned to such exhibits in the Exhibit Table of Item 601 of Regulation S-K.
The Company will furnish to any stockholder, upon written request, any exhibit
listed below, upon payment by such stockholder to the Company of the Company's
reasonable expenses in furnishing such exhibit.
 
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                                  DESCRIPTION
 -------                                  -----------
<S>          <C>  <C>
3(a)         --   Certificate of Incorporation of Cabot Corporation restated
                  effective October 24, 1983, as amended February 14, 1985,
                  December 3, 1986, February 19, 1987, November 18, 1988,
                  November 24, 1995 and March 12, 1996 (incorporated herein by
                  reference to Exhibit 3(a) of Cabot's Annual Report on Form
                  10-K for the year ended September 30, 1996, file reference
                  1-5667, filed with the Commission on December 24, 1996).
3(b)         --   The By-laws of Cabot Corporation as of January 11, 1991
                  (incorporated herein by reference to Exhibit 3(b) of Cabot's
                  Annual Report on Form 10-K for the year ended September 30,
                  1991, file reference 1-5667, filed with the Commission on
                  December 27, 1991).
4(a)         --   Rights Agreement, dated as of November 10, 1995, between
                  Cabot Corporation and The First National Bank of Boston as
                  Rights Agent (incorporated herein by reference to Exhibit 1
                  of Cabot's Registration Statement on Form 8-A, file
                  reference 1-5667, filed with the Commission on November 13,
                  1995).
4(b)(i)      --   Indenture, dated as of December 1, 1987, between Cabot
                  Corporation and The First National Bank of Boston, Trustee
                  (incorporated herein by reference to Exhibit 4 of Amendment
                  No. 1 to Cabot's Registration Statement on Form S-3,
                  Registration No. 33-18883, filed with the Commission on
                  December 10, 1987).
4(b)(ii)     --   First Supplemental Indenture dated as of June 17, 1992, to
                  Indenture, dated as of December 1, 1987, between Cabot
                  Corporation and The First National Bank of Boston, Trustee
                  (incorporated by reference to Exhibit 4.3 of Cabot's
                  Registration Statement on Form S-3, Registration Statement
                  No. 33-48686, filed with the Commission on June 18, 1992).
4(b)(iii)    --   Second Supplemental Indenture, dated as of January 31, 1997,
                  between Cabot Corporation and State Street Bank and Trust
                  Company, Trustee (incorporated herein by reference to
                  Exhibit 4 of Cabot's Quarterly Report on Form 10-Q for the
                  quarterly period ended December 31, 1996, file reference
                  1-5667, filed with the Commission on February 14, 1997).
</TABLE>
 
                                       17
<PAGE>   19
 
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                                  DESCRIPTION
 -------                                  -----------
<S>          <C>  <C>
4(b)(iv)     --   Third Supplemental Indenture, dated as of November 20, 1998,
                  between Cabot Corporation and State Street Bank and Trust
                  Company, Trustee (incorporated herein by reference to
                  Exhibit 4.1 of Cabot's Current Report on Form 8-K, dated
                  November 20, 1998, file reference 1-5667, filed with the
                  Commission on November 20, 1998).
10(a)        --   Credit Agreement, dated as of January 3, 1997, among Cabot
                  Corporation, the banks listed therein and Morgan Guaranty
                  Trust Company of New York, as Agent (incorporated herein by
                  reference to Exhibit 10 of Cabot's Quarterly Report on Form
                  10-Q for the quarterly period ended March 31, 1997, file
                  reference 1-5667, filed with the Commission on May 14,
                  1997).
10(b)(i)*    --   Equity Incentive Plan, as amended (incorporated herein by
                  reference to Exhibit 99 of Cabot's Registration Statement on
                  Form S-8, Registration No. 33-28699, filed with the
                  Commission on May 12, 1989).
10(b)(ii)*   --   1996 Equity Incentive Plan (incorporated herein by reference
                  to Exhibit 28 of Cabot's Registration Statement on Form S-8,
                  Registration No. 333-03683, filed with the Commission on May
                  14, 1996).
10(c)        --   Note Purchase Agreement between John Hancock Mutual Life
                  Insurance Company, State Street Bank and Trust Company, as
                  trustee for the Cabot Corporation Employee Stock Ownership
                  Plan, and Cabot Corporation, dated as of November 15, 1988
                  (incorporated by reference to Exhibit 10(c) of Cabot's
                  Annual Report on Form 10-K for the year ended September 30,
                  1988, file reference 1-5667, filed with the Commission on
                  December 29, 1988).
10(d)(i)*    --   Supplemental Cash Balance Plan (incorporated herein by
                  reference to Exhibit 10(e)(i) of Cabot's Annual Report on
                  Form 10-K for the year ended September 30, 1994, file
                  reference 1-5667, filed with the Commission on December 22,
                  1994).
10(d)(ii)*   --   Supplemental Employee Stock Ownership Plan (incorporated
                  herein by reference to Exhibit 10(e)(ii) of Cabot's Annual
                  Report on Form 10-K for the year ended September 30, 1994,
                  file reference 1-5667, filed with the Commission on December
                  22, 1994).
10(d)(iii)*  --   Supplemental Retirement Incentive Savings Plan (incorporated
                  herein by reference to Exhibit 10(e)(iii) of Cabot's Annual
                  Report on Form 10-K for the year ended September 30, 1994,
                  file reference 1-5667, filed with the Commission on December
                  22, 1994).
10(d)(iv)*   --   Supplemental Employee Benefit Agreement with John G.L. Cabot
                  (incorporated herein by reference to Exhibit 10(f) of
                  Cabot's Annual Report on Form 10-K for the year ended
                  September 30, 1987, file reference 1-5667, filed with the
                  Commission on December 28, 1987).
10(d)(v)*    --   Cabot Corporation Deferred Compensation Plan dated January
                  1, 1995 (incorporated herein by reference to Exhibit
                  10(e)(v) of Cabot's Annual Report on Form 10-K for the year
                  ended September 30, 1995, file reference 1-5667, filed with
                  the Commission on December 29, 1995).
10(d)(vi)*   --   Amendment 1997-I to Cabot Corporation Deferred Compensation
                  Plan dated June 30, 1997 (incorporated herein by reference
                  to Exhibit 10(d)(vi) of Cabot's Annual Report on Form 10-K
                  for the year ended September 30, 1997, file reference
                  1-5667, filed with the Commission on December 24, 1997).
10(e)*       --   Form of severance agreement entered into between Cabot
                  Corporation and various managers (incorporated herein by
                  reference to Exhibit 10(g) of Cabot's Annual Report on Form
                  10-K for the year ended September 30, 1991, file reference
                  1-5667, filed with the Commission on December 27, 1991).
</TABLE>
 
                                       18
<PAGE>   20
 
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                                  DESCRIPTION
 -------                                  -----------
<S>          <C>  <C>
10(f)        --   Group Annuity Contract No. GA-6121 between The Prudential
                  Insurance Company of America and State Street Bank and Trust
                  Company, dated June 28, 1991 (incorporated herein by
                  reference to Exhibit 10(h) of Cabot's Annual Report on Form
                  10-K for the year ended September 30, 1991, file reference
                  1-5667, filed with the Commission on December 27, 1991).
10(g)*       --   Non-employee Directors' Stock Compensation Plan
                  (incorporated herein by reference to Exhibit A of Cabot's
                  Proxy Statement for its 1992 Annual Meeting of Stockholders,
                  file reference 1-5667, filed with the Commission on December
                  27, 1991).
10(h)        --   Agreement for the Sale and Purchase of Liquefied Natural Gas
                  and Transportation Agreement, dated April 13, 1976, between
                  L'Entreprise Nationale pour la Recherche, la Production, le
                  Transport, la Transformation et la Commercialisation des
                  Hydrocarbures ("Sonatrach") and Distrigas Corporation, and
                  Amendment No. 3 to said Agreement, dated February 21, 1988
                  (incorporated herein by reference to Exhibit 10(j) of
                  Cabot's Annual Report on Form 10-K for the year ended
                  September 30, 1994, file reference 1-5667, filed with the
                  Commission on December 22, 1994).
10(i)        --   Agreement for the Sale and Purchase of Liquefied Natural
                  Gas, dated December 11, 1988, between Sonatrading Amsterdam
                  B.V. ("Sonatrading") and Distrigas Corporation and
                  Transportation Agreement, dated December 11, 1988, between
                  Sonatrach and Distrigas Corporation (incorporated herein by
                  reference to Exhibit 10(p) of Cabot's Annual Report on Form
                  10-K for the year ended September 30, 1989, file reference
                  1-5667, filed with the Commission on December 28, 1989).
10(j)        --   Mutual Assurances Agreements among Cabot Corporation,
                  Sonatrach, Distrigas Corporation and Sonatrading dated
                  February 21, 1988 and December 11, 1988, respectively
                  (incorporated herein by reference to Exhibit 10.1 of Cabot's
                  Current Report on Form 8-K dated July 17, 1992, file
                  reference 1-5667, filed with the Commission July 17, 1992).
10(k)(i)     --   Asset Transfer Agreement, dated as of June 13, 1995, among
                  Cabot Safety Corporation, Cabot Canada Ltd., Cabot Safety
                  Limited, Cabot Corporation, Cabot Safety Holdings
                  Corporation and Cabot Safety Acquisition Corporation
                  (incorporated herein by reference to Exhibit 2(a) of Cabot
                  Corporation's Current Report on Form 8-K, dated July 11,
                  1995, file reference 1-5667, filed with the Commission July
                  26, 1995).
10(k)(ii)    --   Stockholders' Agreement, dated as of July 11, 1995, among
                  Vestar Equity Partners, L.P., Cabot CSC Corporation, Cabot
                  Safety Holdings Corporation, Cabot Corporation and various
                  other parties thereto (incorporated herein by reference to
                  Exhibit 2(b) of Cabot Corporation's Current Report on Form
                  8-K, dated July 11, 1995, file reference 1-5667, filed with
                  the Commission July 26, 1995).
10(l)        --   Cabot Corporation Senior Management Severance Protection
                  Plan, effective January 9, 1998 (incorporated herein by
                  reference to exhibit 10(a) of Cabot's Quarterly Report on
                  Form 10-Q for the quarterly period ended December 31, 1997,
                  file reference 1-5667, filed with the Commission February
                  17, 1998).
10(m)        --   Cabot Corporation Key Employee Severance Protection Plan,
                  effective January 9, 1998 (incorporated herein by reference
                  to exhibit 10(b) of Cabot's Quarterly Report on Form 10-Q
                  for the quarterly period ended December 31, 1997, file
                  reference 1-5667, filed with the Commission February 17,
                  1998).
10(n)*       --   Cabot Corporation Short-Term Incentive Compensation Plan,
                  effective November 12, 1998 (subject to approval at the 1999
                  Annual Meeting of Shareholders of Cabot Corporation, to be
                  held March 11, 1999), filed herewith.
12           --   Statement Re: Computation of Ratios of Earnings to Fixed
                  Charges, filed herewith.
13           --   Pages 21 through 48 of the 1998 Annual Report to
                  Stockholders of Cabot Corporation, a copy of which is
                  furnished for the information of the Securities and Exchange
                  Commission. Portions of the Annual Report not incorporated
                  herein by reference are not deemed "filed" with the
                  Commission.
</TABLE>
 
                                       19
<PAGE>   21
 
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                                  DESCRIPTION
 -------                                  -----------
<S>          <C>  <C>
21           --   List of Significant Subsidiaries, filed herewith.
23           --   Consent of PricewaterhouseCoopers LLP, filed herewith.
24           --   Power of attorney for signing of this Annual Report on Form
                  10-K, filed herewith.
27(a)        --   Financial Data Schedule for the fiscal year ended September
                  30, 1998, filed herewith.
27(b)        --   Restated Financial Data Schedule for the fiscal year ended
                  September 30, 1997, filed herewith.
27(c)        --   Restated Financial Data Schedule for the fiscal year ended
                  September 30, 1996, filed herewith.
</TABLE>
 
- ---------------
 
* Management contract or compensatory plan or arrangement.
 
     (d) Schedules.  The Schedules have been omitted for the reason that they
are not required or are not applicable, or the required information is shown in
the financial statements or notes thereto.
 
                                       20
<PAGE>   22
 
                                   SIGNATURES
 
     Pursuant to the requirements of Section 13 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.
                                          CABOT CORPORATION(Registrant)
 
                                          By      /s/ Samuel W. Bodman
 
                                            ------------------------------------
                                                     Samuel W. Bodman,
                                                Chairman of the Board and
                                                 Chief Executive Officer
 
Date:  December 22, 1998
 
     Pursuant to the requirement 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.
 
<TABLE>
<CAPTION>
                     SIGNATURES                                   TITLE                    DATE
                     ----------                                   -----                    ----
<S>                                                    <C>                           <C>
 
                /s/ Samuel W. Bodman                   Director, Chairman of the     December 22, 1998
- -----------------------------------------------------    Board and Chief Executive
                  Samuel W. Bodman                       Office (principal
                                                         executive officer)
 
                          *                            Director and President        December 22, 1998
- -----------------------------------------------------
Kennett F. Burnes
 
                /s/ Robert L. Culver                   Executive Vice President and  December 22, 1998
- -----------------------------------------------------    Chief Financial Officer
                  Robert L. Culver                       (principal financial
                                                         officer)
 
               /s/ William T. Anderson                 Controller                    December 22, 1998
- -----------------------------------------------------    (principal accounting
                 William T. Anderson                     officer)
 
                          *                            Director                      December 22, 1998
- -----------------------------------------------------
Jane C. Bradley
 
                          *                            Director                      December 22, 1998
- ----------------------------------------------------- 
John G.L. Cabot
 
                          *                            Director                      December 22, 1998
- -----------------------------------------------------
John S. Clarkeson
 
                          *                            Director                      December 22, 1998
- -----------------------------------------------------
Arthur L. Goldstein
 
                          *                            Director                      December 22, 1998
- -----------------------------------------------------
Robert P. Henderson
</TABLE>
 
                                       21
<PAGE>   23
 
<TABLE>
<CAPTION>
                     SIGNATURES                                   TITLE                    DATE
                     ----------                                   -----                    ----
<S>                                                    <C>                           <C>
 
                         *                             Director                      December 22, 1998
- -----------------------------------------------------
                  Arnold S. Hiatt
 
                         *                             Director                      December 22, 1998
- -----------------------------------------------------
                  Gautam S. Kaji
 
                         *                             Director                      December 22, 1998
- -----------------------------------------------------
               Roderick C.G. MacLeod
 
                         *                             Director                      December 22, 1998
- -----------------------------------------------------
                 John H. McArthur
 
                         *                             Director                      December 22, 1998
- -----------------------------------------------------
                  John F. O'Brien
 
                         *                             Director                      December 22, 1998
- -----------------------------------------------------
                  David V. Ragone
 
                         *                             Director                      December 22, 1998
- -----------------------------------------------------
                Charles P. Siess, Jr.
 
                         *                             Director                      December 22, 1998
- -----------------------------------------------------
                  Morris Tanenbaum
 
                         *                             Director                      December 22, 1998
- -----------------------------------------------------
                  Lydia W. Thomas
 
                         *                             Director                      December 22, 1998
- -----------------------------------------------------
                  Mark S. Wrighton
 
              *By /s/ Sarah W. Saunders
  -------------------------------------------------
                  Sarah W. Saunders
                 as Attorney-in-Fact
</TABLE>
 
                                       22
<PAGE>   24
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                                  DESCRIPTION
 -------                                  -----------
<S>          <C>  <C>
 3(a)        --   Certificate of Incorporation of Cabot Corporation restated
                  effective October 24, 1983, as amended February 14, 1985,
                  December 3, 1986, February 19, 1987, November 18, 1988,
                  November 24, 1995 and March 12, 1996 (incorporated herein by
                  reference to Exhibit 3(a) of Cabot's Annual Report on Form
                  10-K for the year ended September 30, 1996, file reference
                  1-5667, filed with the Commission on December 24, 1996).
 3(b)        --   The By-laws of Cabot Corporation as of January 11, 1991
                  (incorporated herein by reference to Exhibit 3(b) of Cabot's
                  Annual Report on Form 10-K for the year ended September 30,
                  1991, file reference 1-5667, filed with the Commission on
                  December 27, 1991).
 4(a)        --   Rights Agreement, dated as of November 10, 1995, between
                  Cabot Corporation and The First National Bank of Boston as
                  Rights Agent (incorporated herein by reference to Exhibit 1
                  of Cabot's Registration Statement on Form 8-A, file
                  reference 1-5667, filed with the Commission on November 13,
                  1995).
 4(b)(i)     --   Indenture, dated as of December 1, 1987, between Cabot
                  Corporation and The First National Bank of Boston, Trustee
                  (incorporated herein by reference to Exhibit 4 of Amendment
                  No. 1 to Cabot's Registration Statement on Form S-3,
                  Registration No. 33-18883, filed with the Commission on
                  December 10, 1987).
 4(b)(ii)    --   First Supplemental Indenture dated as of June 17, 1992, to
                  Indenture, dated as of December 1, 1987, between Cabot
                  Corporation and The First National Bank of Boston, Trustee
                  (incorporated by reference to Exhibit 4.3 of Cabot's
                  Registration Statement on Form S-3, Registration Statement
                  No. 33-48686, filed with the Commission on June 18, 1992).
 4(b)(iii)   --   Second Supplemental Indenture, dated as of January 31, 1997,
                  between Cabot Corporation and State Street Bank and Trust
                  Company, Trustee (incorporated herein by reference to
                  Exhibit 4 of Cabot's Quarterly Report on Form 10-Q for the
                  quarterly period ended December 31, 1996, file reference
                  1-5667, filed with the Commission on February 14, 1997).
 4(b)(iv)    --   Third Supplemental Indenture, dated as of November 20, 1998,
                  between Cabot Corporation and State Street Bank and Trust
                  Company, Trustee (incorporated herein by reference to
                  Exhibit 4.1 of Cabot's Current Report on Form 8-K, dated
                  November 20, 1998, file reference 1-5667, filed with the
                  Commission on November 20, 1998).
10(a)        --   Credit Agreement, dated as of January 3, 1997, among Cabot
                  Corporation, the banks listed therein and Morgan Guaranty
                  Trust Company of New York, as Agent (incorporated herein by
                  reference to Exhibit 10 of Cabot's Quarterly Report on Form
                  10-Q for the quarterly period ended March 31, 1997, file
                  reference 1-5667, filed with the Commission on May 14,
                  1997).
10(b)(i)*    --   Equity Incentive Plan, as amended (incorporated herein by
                  reference to Exhibit 99 of Cabot's Registration Statement on
                  Form S-8, Registration No. 33-28699, filed with the
                  Commission on May 12, 1989).
10(b)(ii)*   --   1996 Equity Incentive Plan (incorporated herein by reference
                  to Exhibit 28 of Cabot's Registration Statement on Form S-8,
                  Registration No. 333-03683, filed with the Commission on May
                  14, 1996).
10(c)        --   Note Purchase Agreement between John Hancock Mutual Life
                  Insurance Company, State Street Bank and Trust Company, as
                  trustee for the Cabot Corporation Employee Stock Ownership
                  Plan, and Cabot Corporation, dated as of November 15, 1988
                  (incorporated by reference to Exhibit 10(c) of Cabot's
                  Annual Report on Form 10-K for the year ended September 30,
                  1988, file reference 1-5667, filed with the Commission on
                  December 29, 1988).
10(d)(i)*    --   Supplemental Cash Balance Plan (incorporated herein by
                  reference to Exhibit 10(e)(i) of Cabot's Annual Report on
                  Form 10-K for the year ended September 30, 1994, file
                  reference 1-5667, filed with the Commission on December 22,
                  1994).
</TABLE>
<PAGE>   25
 
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                                  DESCRIPTION
 -------                                  -----------
<S>          <C>  <C>
10(d)(ii)*   --   Supplemental Employee Stock Ownership Plan (incorporated
                  herein by reference to Exhibit 10(e)(ii) of Cabot's Annual
                  Report on Form 10-K for the year ended September 30, 1994,
                  file reference 1-5667, filed with the Commission on December
                  22, 1994).
10(d)(iii)*  --   Supplemental Retirement Incentive Savings Plan (incorporated
                  herein by reference to Exhibit 10(e)(iii) of Cabot's Annual
                  Report on Form 10-K for the year ended September 30, 1994,
                  file reference 1-5667, filed with the Commission on December
                  22, 1994).
10(d)(iv)*   --   Supplemental Employee Benefit Agreement with John G.L. Cabot
                  (incorporated herein by reference to Exhibit 10(f) of
                  Cabot's Annual Report on Form 10-K for the year ended
                  September 30, 1987, file reference 1-5667, filed with the
                  Commission on December 28, 1987).
10(d)(v)*    --   Cabot Corporation Deferred Compensation Plan dated January
                  1, 1995 (incorporated herein by reference to Exhibit
                  10(e)(v) of Cabot's Annual Report on Form 10-K for the year
                  ended September 30, 1995, file reference 1-5667, filed with
                  the Commission on December 29, 1995).
10(d)(vi)*   --   Amendment 1997-I to Cabot Corporation Deferred Compensation
                  Plan dated June 30, 1997 (incorporated herein by reference
                  to Exhibit 10(d)(vi) of Cabot's Annual Report on Form 10-K
                  for the year ended September 30, 1997, file reference
                  1-5667, filed with the Commission on December 24, 1997).
10(e)*       --   Form of severance agreement entered into between Cabot
                  Corporation and various managers (incorporated herein by
                  reference to Exhibit 10(g) of Cabot's Annual Report on Form
                  10-K for the year ended September 30, 1991, file reference
                  1-5667, filed with the Commission on December 27, 1991).
10(f)        --   Group Annuity Contract No. GA-6121 between The Prudential
                  Insurance Company of America and State Street Bank and Trust
                  Company, dated June 28, 1991 (incorporated herein by
                  reference to Exhibit 10(h) of Cabot's Annual Report on Form
                  10-K for the year ended September 30, 1991, file reference
                  1-5667, filed with the Commission on December 27, 1991).
10(g)*       --   Non-employee Directors' Stock Compensation Plan
                  (incorporated herein by reference to Exhibit A of Cabot's
                  Proxy Statement for its 1992 Annual Meeting of Stockholders,
                  file reference 1-5667, filed with the Commission on December
                  27, 1991).
10(h)        --   Agreement for the Sale and Purchase of Liquefied Natural Gas
                  and Transportation Agreement, dated April 13, 1976, between
                  L'Entreprise Nationale pour la Recherche, la Production, le
                  Transport, la Transformation et la Commercialisation des
                  Hydrocarbures ("Sonatrach") and Distrigas Corporation, and
                  Amendment No. 3 to said Agreement, dated February 21, 1988
                  (incorporated herein by reference to Exhibit 10(j) of
                  Cabot's Annual Report on Form 10-K for the year ended
                  September 30, 1994, file reference 1-5667, filed with the
                  Commission on December 22, 1994).
10(i)        --   Agreement for the Sale and Purchase of Liquefied Natural
                  Gas, dated December 11, 1988, between Sonatrading Amsterdam
                  B.V. ("Sonatrading") and Distrigas Corporation and
                  Transportation Agreement, dated December 11, 1988, between
                  Sonatrach and Distrigas Corporation (incorporated herein by
                  reference to Exhibit 10(p) of Cabot's Annual Report on Form
                  10-K for the year ended September 30, 1989, file reference
                  1-5667, filed with the Commission on December 28, 1989).
10(j)        --   Mutual Assurances Agreements among Cabot Corporation,
                  Sonatrach, Distrigas Corporation and Sonatrading dated
                  February 21, 1988 and December 11, 1988, respectively
                  (incorporated herein by reference to Exhibit 10.1 of Cabot's
                  Current Report on Form 8-K dated July 17, 1992, file
                  reference 1-5667, filed with the Commission July 17, 1992).
</TABLE>
<PAGE>   26
 
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                                  DESCRIPTION
 -------                                  -----------
<S>          <C>  <C>
10(k)(i)     --   Asset Transfer Agreement, dated as of June 13, 1995, among
                  Cabot Safety Corporation, Cabot Canada Ltd., Cabot Safety
                  Limited, Cabot Corporation, Cabot Safety Holdings
                  Corporation and Cabot Safety Acquisition Corporation
                  (incorporated herein by reference to Exhibit 2(a) of Cabot
                  Corporation's Current Report on Form 8-K, dated July 11,
                  1995, file reference 1-5667, filed with the Commission July
                  26, 1995).
10(k)(ii)    --   Stockholders' Agreement, dated as of July 11, 1995, among
                  Vestar Equity Partners, L.P., Cabot CSC Corporation, Cabot
                  Safety Holdings Corporation, Cabot Corporation and various
                  other parties thereto (incorporated herein by reference to
                  Exhibit 2(b) of Cabot Corporation's Current Report on Form
                  8-K, dated July 11, 1995, file reference 1-5667, filed with
                  the Commission July 26, 1995).
10(l)        --   Cabot Corporation Senior Management Severance Protection
                  Plan, effective January 9, 1998 (incorporated herein by
                  reference to exhibit 10(a) of Cabot's Quarterly Report on
                  Form 10-Q for the quarterly period ended December 31, 1997,
                  file reference 1-5667, filed with the Commission February
                  17, 1998).
10(m)        --   Cabot Corporation Key Employee Severance Protection Plan,
                  effective January 9, 1998 (incorporated herein by reference
                  to exhibit 10(b) of Cabot's Quarterly Report on Form 10-Q
                  for the quarterly period ended December 31, 1997, file
                  reference 1-5667, filed with the Commission February 17,
                  1998).
10(n)*       --   Cabot Corporation Short-Term Incentive Compensation Plan,
                  effective November 12, 1998 (subject to approval at the 1999
                  Annual Meeting of Shareholders of Cabot Corporation, to be
                  held March 11, 1999), filed herewith.
12           --   Statement Re: Computation of Ratios of Earnings to Fixed
                  Charges, filed herewith.
13           --   Pages 21 through 48 of the 1998 Annual Report to
                  Stockholders of Cabot Corporation, a copy of which is
                  furnished for the information of the Securities and Exchange
                  Commission. Portions of the Annual Report not incorporated
                  herein by reference are not deemed "filed" with the
                  Commission.
21           --   List of Significant Subsidiaries, filed herewith.
23           --   Consent of PricewaterhouseCoopers LLP, filed herewith.
24           --   Power of attorney for signing of this Annual Report on Form
                  10-K, filed herewith.
27(a)        --   Financial Data Schedule for the fiscal year ended September
                  30, 1998, filed herewith.
27(b)        --   Restated Financial Data Schedule for the fiscal year ended
                  September 30, 1997, filed herewith.
27(c)        --   Restated Financial Data Schedule for the fiscal year ended
                  September 30, 1996, filed herewith.
</TABLE>
 
- ---------------
 
* Management contract or compensatory plan or arrangement.

<PAGE>   1
 
                                                                   EXHIBIT 10(n)
 
                               CABOT CORPORATION
                     SHORT-TERM INCENTIVE COMPENSATION PLAN
 
     The purpose of this Short-Term Incentive Compensation Plan (this "Plan") is
to provide incentives for certain senior executives of Cabot Corporation (the
"Company") to achieve a sustained, high level of financial success for the
Company. This Plan does that by placing a portion of the senior executives'
annual compensation at risk based on Company and individual performance. This
Plan is intended to comply with the requirements for tax deductibility imposed
by Internal Revenue Code Section 162(m) as in effect from time to time ("Section
162(m)") with respect to Awards paid pursuant to this Plan.
 
ADMINISTRATION
 
     This Plan will be administered by the Compensation Committee of the Board
of Directors or, if any member of the Compensation Committee is not an "outside
director" for the purposes of Section 162(m), by a subcommittee of the
Compensation Committee consisting of those members of the Compensation Committee
who are "outside directors" for such purposes. The Compensation Committee or
subcommittee administering this Plan is referred to herein as the "Committee."
The Committee may delegate to management administrative functions that do not
involve discretion. The Committee shall have the authority to interpret this
Plan, and any interpretation or decision by the Committee with regard to any
questions arising under this Plan shall be final and conclusive on all
participants in this Plan.
 
ELIGIBILITY; PARTICIPANTS
 
     Only officers of the Company shall be eligible to participate in this Plan
for any fiscal year of the Company (an "Award Year"). Not later than 90 days
after the beginning of each Award Year, the Committee shall (a) select, from
among those eligible, the persons who shall participate in this Plan (the
"Participants") for the Award Year, and (b) designate for each Participant a
specific percentage of the Award Pool as the Participant's potential award (the
"Potential Award"). No Participant shall have a Potential Award exceeding 50% of
the Award Pool, and the sum of the Potential Awards specified by the Committee
for an Award Year shall not exceed 100% of the Award Pool.
 
FORMULA
 
     The amount available for Awards under this Plan for each Award Year (the
"Award Pool") will be 10% of the amount, if any, by which the Company's Adjusted
Net Income for the Award Year exceeds 10% of Average Stockholders' Equity.
Adjusted Net Income for an Award Year shall be the consolidated net income of
the Company as reported to shareholders in the Company's Annual Report,
excluding from the calculation of net income all of the following items to the
extent they appear as separate line items in the Company's audited consolidated
statement of income appearing in the Annual Report: extraordinary or
non-recurring items, changes in tax laws, items relating to discontinued
operations, items relating to divested businesses or sales of businesses,
restructuring charges, effects of accounting changes and any other special,
unusual or non-recurring gain or loss; provided, however, that the Committee may
in its discretion include any such item that causes the Award Pool to be
reduced. Where any such item to be excluded is stated in the Company's
consolidated statement of income as a pre-tax amount, the amount to be excluded
shall be adjusted to an after-tax amount using an assumed tax rate (to cover all
federal, state and foreign income taxes) equal to the maximum marginal federal
income tax rate in effect for US corporations during the Award Year, plus 2%.
Average Stockholders' Equity shall be the average of (a) the total stockholders'
equity at the end of the Award Year and (b) the total stockholders' equity at
the end of the preceding fiscal year (i.e., at the beginning of the Award Year),
in each case as reported in the Company's Annual Report.
 
PAYMENTS
 
     When the Company's financial results for the Award Year have been
determined, the Committee will evaluate the Company's financial results,
determine the dollar amounts of the Award Pool and of the Potential Award and
the actual Award, if any, for each Participant, and shall certify its
determinations in writing (the "Certification").
<PAGE>   2
 
     In determining the actual Award to be paid to each Participant, the
Committee may exercise discretion to reduce (but not increase) the Award from
the amount of the Participant's Potential Award, after taking into account the
Company's financial performance, performance of the Participant, and competitive
compensation levels. It is expected that the Committee will use its discretion
carefully and apply good and rigorous judgment in appraising the performance of
the Company and the contributions of each Participant to the Company's
performance.
 
     A reduction in the Award paid to a Participant shall not be available to
increase the Award of any other Participant. If the total of the Awards as
finally determined for any Award Year is less than the Award Pool, the unused
portion of the Award Pool will not be carried over to the next Award Year or be
added to any future Award Pool.
 
     Awards will be paid in cash as soon as practical after the Certification or
may, at the election of the Participant and under procedures adopted by the
Committee or any deferred compensation plans from time to time in effect and in
accordance with the regulations promulgated under Section 162(m), be deferred.
 
TAX WITHHOLDING
 
     The Company will deduct any required withholding taxes from the payments
under this Plan.
 
TERMINATION OF EMPLOYMENT
 
     Any Participant who is not an employee of the Company on September 30 of an
Award Year will not receive any Award for that Award Year, except that if a
Participant's employment terminates due to death or disability the Committee may
at its discretion authorize payment of an Award to such Participant (or his or
her estate) at the time other Awards are paid in respect of that Award Year.
 
NO RIGHT TO AWARDS OR CONTINUED EMPLOYMENT
 
     No person shall have any claim or right to be granted an Award, nor shall
the selection for participation in the Plan for any Award Year be construed as
giving a Participant the right to be retained in the employ of the Company for
that Award Year or for any other period.
 
INTERPRETATION AND AMENDMENTS
 
     This Plan is designed to comply with Section 162(m), and all provisions in
this Plan shall be construed in a manner consistent with that intent. The
Company's Board of Directors may amend or terminate this Plan at any time, but
no amendment shall expand the class of eligible employees or increase either the
funding formula for determining the Award Pool or the maximum Award to an
individual Participant without the approval of the Company's shareholders.
Subject to the foregoing restrictions, this Plan may be amended to add
conditions or provisions required, or to remove conditions or provisions no
longer required or permitted, by Section 162(m).
 
     Nothing in this Plan shall be deemed in any way to limit or restrict the
Company from making any award to any person (including a Participant in this
Plan) under any other plan, arrangement or understanding, whether now existing
or hereafter arising, or on an ad hoc basis, except as follows. No award to any
Participant in this Plan shall be made under any other plan, arrangement or
understanding, or on an ad hoc basis, where the amount of such other award is
designed to compensate the Participant if, and to the extent that, as a result
of the Company's performance, his or her Potential Award or actual Award under
this Plan does not reach a particular level.
 
PLAN TERM
 
     This Plan shall be effective as of the date adopted, for the Award Year
ending September 30, 1999, subject to receiving shareholder approval at the 1999
Annual Shareholders Meeting, and shall remain in effect for subsequent Award
Years until terminated by the Company's Board of Directors.

<PAGE>   1
                                                                      EXHIBIT 12


                CABOT CORPORATION AND CONSOLIDATED SUBSIDIARIES
                                        
     STATEMENT REGARDING COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
                      (Amounts in millions, except ratios)


<TABLE>
<CAPTION>
                                                     Years ended September 30
                                               -------------------------------------
                                                1998   1997    1996    1995    1994
                                               -----  ------  ------  ------  ------
<S>                                            <C>    <C>     <C>     <C>     <C>
Earnings:
  Pre-tax income from continuing operations    168.0  $117.0  $279.8  $256.0  $118.3
  Distributed income of affiliated companies     7.5    10.4    11.2    11.7     5.6
  Add fixed charges:
    Interest on indebtedness                    42.0    43.2    41.7    35.6    41.7
    Portion of rents representative of
     the interest factor                         5.1     4.9     4.8     5.5     5.9
                                               -----  ------  ------  ------  ------
  Income as adjusted                           222.6  $175.5  $337.5  $308.8  $171.5

Fixed charges:
  Interest on indebtedness                      42.0  $ 43.2  $ 41.7  $ 35.6  $ 41.7
  Capitalized interest                             -       -       -       -       -
  Portion of rents representative of
     the interest factor                         5.1     4.9     4.8     5.5     5.9
                                               -----  ------  ------  ------  ------
  Total fixed charges                           47.1  $ 48.1  $ 46.5  $ 41.1  $ 47.6

  Ratio of earnings to fixed charges             4.7     3.6     7.3     7.5     3.6
                                               =====  ======  ======  ======  ======
</TABLE>










<PAGE>   1
- --------------------------------------------------------------------------------
management's discussion and analysis of financial condition and results of 
operations
- --------------------------------------------------------------------------------


Cabot Corporation is comprised of a Specialty Chemicals and Materials Group and
an Energy Group. The Specialty Chemicals and Materials Group consists of the
following businesses: carbon black, fumed silica, plastics, performance
materials, microelectronics materials, inkjet colorants, and specialty fluids.
The Energy Group consists of Cabot LNG Corporation, a wholly owned subsidiary,
and its subsidiaries.

     The following analysis of financial condition and operating results should
be read in conjunction with the Company's Consolidated Financial Statements and
accompanying Notes. Unless a calendar year is specified, all references in this
discussion to years are to the Company's fiscal year ended September 30.

     Operating profit for 1998, 1997 and 1996 was $156 million, $187 million and
$284 million, respectively. Operating profit for each of the three years
included special items. Special items in 1998 included charges of $60 million
for an asset impairment related to an Indonesian carbon black plant and $25
million related to a tantalum ore recovery project. Special items for 1997
included $18 million of charges related to asset impairment and severance costs
in the Company's Specialty Chemicals and Materials Group. Special items for 1996
included $6 million of gains related to the Company's LNG business. Operating
profit before special items for 1998, 1997 and 1996 was $241 million, $205
million and $278 million, respectively. Operating margins as a percentage of
sales, before special items, during 1998, 1997 and 1996 were 15%, 13% and 15%,
respectively. Unless indicated otherwise, the following discussion excludes the
special items noted above to form a comparative basis.

Overview

The Company reported increased operating profit for the year, despite the
negative effects of weakened Asian economies and a strengthened U.S. dollar.
Certain key fundamentals in the Company's operating environment, which had
negatively impacted the financial results of the Company in 1997, gradually
improved during 1998. For example, the Company's carbon black business
experienced higher feedstock costs throughout 1997. During 1998, carbon black
feedstock costs retreated. Lower carbon black feedstock costs and higher volumes
offset the negative effects of lower selling prices and weak Asian market
conditions, sustaining carbon black's operating profit for 1998. Also, the
recovery of the U.S. electronics industry contributed to improved operating
results in the Company's performance materials business, compared with 1997. The
Company's fastest growing business, Microelectronics Materials Division ("MMD"),
reported a significant increase in operating profit for the year. MMD is
expected to continue to experience significant growth in 1999* (see page 29).
The fumed silica business reported improved results year over year. Finally, the
Company's liquefied natural gas ("LNG") business more than doubled its operating
profit in 1998, primarily due to greater firm sales commitments of LNG.

Outlook

Looking forward, however, the LNG business is expected to have a negative
operating comparison in 1999 due to lower year-to-year gas selling prices.
Earnings in the Company's carbon black business are expected to improve very
modestly. Given positive volume trends in the performance materials,
microelectronics materials and fumed silica businesses, the Company expects some
earnings growth in 1999* (see page 29).

Financial Information By Industry Segment

                                    --------------------------------------------
    Years ended September 30                 1998         1997         1996
================================================================================
    Dollars in millions

    Net Sales and Other
    Operating Revenues
    Specialty Chemicals and Materials      $1,437       $1,430       $1,434
    Energy                                    211          200          422
- --------------------------------------------------------------------------------
      TOTAL NET SALES AND OTHER
      OPERATING REVENUES                   $1,648       $1,630       $1,856
- --------------------------------------------------------------------------------
    Operating Profit--Before
    Special Items
    Specialty Chemicals and Materials      $  226       $  199       $  261
    Energy                                     15            6           17
- --------------------------------------------------------------------------------
      TOTAL OPERATING PROFIT--
      BEFORE SPECIAL ITEMS                    241          205          278

    Special Items                             (85)         (18)           6
- --------------------------------------------------------------------------------
      TOTAL OPERATING PROFIT               $  156       $  187       $  284

    Interest Expense                       $  (42)      $  (43)      $  (42)
    General Corporate/
      Other Expenses                          (31)         (27)         (29)
    Costs Related to Divested
      Business                                 (5)          --           --
    Gains on Sales of Equity Securities        90           --           28
    Gain on Sale of Business                   --           --           39

- --------------------------------------------------------------------------------
    INCOME BEFORE
      INCOME TAXES                         $  168       $ 117        $  280
================================================================================

Net Sales and Other Operating Revenues

Net sales and other operating revenues for 1998, 1997 and 1996 were $1,648
million, $1,630 million and $1,856 million, respectively. Revenues increased $18
million in 1998 compared to 1997 due to a 6% increase in volume in the Specialty
Chemicals and Materials Group, which more than offset the effects of lower
carbon black selling prices, and as a result of greater firm sales commitments
in the Company's LNG business.

     Net sales and other operating revenues for 1996 included $278 million from
the operations of TUCO, the Company's

                                                                           21  


<PAGE>   2


- --------------------------------------------------------------------------------
management's discussion and analysis of financial condition and results of 
operations (continued)

- --------------------------------------------------------------------------------


former coal-handling subsidiary. Excluding TUCO results from 1996, the Company
experienced an increase in revenue during 1997 of $52 million. The increase was
attributable to greater revenues in the Company's LNG business. LNG reported an
increase of $56 million, or 39%, in revenue due to 36% greater volumes and
better pricing.

                               [GRAPHIC OMITTED]

     The Company's gross margin as a percentage of net sales for 1998, 1997 and
1996 was 32%, 30% and 29%, respectively. In 1998, profit improved in all of the
Company's businesses. Profit improvement in the Specialty Chemicals and
Materials Group was primarily the result of higher volumes and improved
operating efficiencies in the Company's fumed silica, microelectronics and
performance materials businesses. In the carbon black business, higher volumes
and lower feedstock costs offset the effect of lower year-to-year carbon black
selling prices. Higher gross margin in the Company's LNG business was primarily
due to greater availability of liquefied natural gas entering into 1998,
allowing the Company to take advantage of higher year-to-year gas prices and to
increase firm sales commitments during the first half of the year.

     Gross margin for 1996 included the operating results of TUCO, which were 5%
of TUCO's net sales. Exclusive of TUCO, the gross margin percentage for 1996 was
34%. The decrease in gross margin during 1997 was primarily the result of lower
year-to-year selling prices, combined with the effect of higher feedstock costs
in the Company's carbon black business. Overall, carbon black selling prices
were down 3% during 1997. In addition, feedstock costs during 1997 were, on
average, 4% higher than in 1996.

Expenses

The Company's selling, research, technical and administrative expenses for 1998,
1997 and 1996 were $313 million, $300 million and $286 million, respectively. In
1998, selling and administrative costs included $5 million of costs related to a
divested business. Exclusive of these costs, the increase in administrative
expenses in 1998 was due to increased selling expenses related to new product 
initiatives and higher corporate expenses, which primarily related to the 
reorganization of certain corporate functions.

     The increase in selling, research, technical and administrative expenses in
1997 was largely due to the Company's continued focus on developing new
products. As part of its long-term strategy for earnings growth, the Company
continues to invest in research and marketing for the development of high-value,
differentiated new products and new businesses.

Asia

Weakened economies in parts of Asia have somewhat altered the risks and
opportunities of the Company's activities in affected economies. The primary
impact has been on the performance of the Company's Indonesian carbon black
business. Weakened Asian conditions negatively impacted the operating results of
the Company by approximately $17 million in 1998. Exposures continue to exist
from, among other things, continued lower operating results due to decreases, or
delays in, sales and orders and increased receivables delinquencies and
potential bad debts in the region. While this situation continues to receive
close monitoring and increased management attention, it is not expected to have
a material adverse effect on the financial position, results of operations or
liquidity of the Company in 1999* (see page 29).

Special Items

The financial and economic circumstances in Indonesia resulted in a significant
decline in carbon black demand in the local market there. As a result,
management decided to temporarily halt production at one of the Company's two
Indonesian carbon black plants during 1998. The Company recognized an impairment
loss of $60 million in 1998 for the difference between the carrying value of the
plant's long-lived assets and the estimated fair value. The charge to the
Specialty Chemicals and Materials Group consisted of $34 million for property,
plant and equipment and other assets, and $26 million for goodwill and other
intangible assets. The Company will continue to maintain the facility and assess
the demand for carbon black in the region as a basis for future decisions to
restart production.

     During 1997, the Company entered into an agreement to process tantalum ore
residues accumulated from the Company's past production of tantalum. The Company
expected that the process would produce economic recoveries of tantalum and
capitalized prepaid expenses of approximately $25 million associated with the
agreement. However, the tantalum recovery rate was


  22


<PAGE>   3


- --------------------------------------------------------------------------------
management's discussion and analysis of financial condition and results of 
operations (continued)

- --------------------------------------------------------------------------------


substantially lower than expected. Therefore, management discontinued the
project which resulted in a charge of $25 million to the operations of the
Specialty Chemicals and Materials Group in 1998.

     The $18 million charge for special items in fiscal year 1997 related to the
Specialty Chemicals and Materials Group. These special charges were various
one-time charges of $10 million for asset impairment costs (primarily canceled
capital projects and the write-off of unproductive assets) and $8 million of
employee severance costs (primarily early retirement programs) mostly undertaken
as part of a continuing effort to reduce costs. The Company substantially
completed these initiatives during 1998. Given the effects of evolving to a
market-focused structure, it is not possible to quantify the savings generated
from these efforts.

     During 1996, the Company recognized a gain of $3 million related to the
settlement of a contractual matter and a $3 million gain from a reduction in the
Company's ownership position in the Trinidad natural gas liquefaction project.

                              [GRAPHIC OMITTED]

Other Expenses

Interest expense for 1998, 1997 and 1996 was $42 million, $43 million and $42
million, respectively. The decrease in interest expense in 1998 was largely due
to lower interest rates. The increase in interest expense in 1997 was primarily
due to higher levels of debt resulting from the Company's stock repurchase
program and capital expenditures.

     General corporate/other expenses for 1998, 1997 and 1996 were $31 million,
$27 million and $29 million, respectively. The increase in 1998 was primarily
the result of changes in the Company's organizational structure (see page 20).
During the year, the Company reorganized into 20 strategic business units. As a
result, the Company's manufacturing, human resources, information services,
safety, health and environment and finance functions are in the process of being
coordinated more centrally to support the business units efficiently. The
decrease in unallocated corporate expenses during 1997 was primarily due to
lower environmental expenses.

Provision for Income Taxes

The effective tax rate on income from operations was 36% in 1998 and 1997, and
35% in 1996. The tax rate in 1996 reflected the impact of research and
experimentation tax credits taken in 1996 relating to prior years. The effective
tax rate in 1996 would have been 37% without the impact of those credits. A more
detailed analysis of income taxes is presented in Note L to the Consolidated
Financial Statements.

Net Income

Net income in 1998 was $122 million ($1.61 per diluted common share) compared
with $93 million ($1.19 per diluted common share) in 1997 and $194 million
($2.42 per diluted common share) in 1996. Net income in 1998 included a $90
million ($0.77 per diluted common share) gain from the sale of 2.3 million
shares of the Company's investment in K N Energy, Inc. common stock, a $60
million ($0.51 per diluted common share) asset impairment charge related to an
Indonesian carbon black plant, and a $25 million ($0.21 per diluted common
share) charge related to a tantalum ore recovery project. Net income in 1997
included special charges for asset impairments and severance costs totaling $18
million ($0.15 per diluted common share). Net income for 1996 included several
special items. These items were $5 million ($0.06 per diluted common share) of
tax benefits from research and experimentation tax credits, a $28 million ($0.22
per diluted common share) gain from the sale of 1.85 million shares of the
Company's investment in K N Energy, Inc., a $39 million ($0.31 per diluted
common share) gain from the sale of the Company's coal handling and distribution
business, and other gains totaling $6 million ($0.05 per diluted common share)
in the Company's LNG business. Excluding special items, net income would have
been $118 million ($1.56 per diluted common share) in 1998, $104 million ($1.34
per diluted common share) in 1997, and $143 million ($1.78 per diluted common
share) in 1996.

Specialty Chemicals and Materials

Specialty Chemicals and Materials Group sales increased to $1,437 million in
1998 from $1,430 million in 1997. The increase in sales reflects 6% greater
chemical volumes, partially offset by lower year-to-year carbon black selling
prices and the effects of a stronger U.S. dollar.

     In 1997, Specialty Chemicals and Materials Group sales were flat compared
with 1996, despite significantly lower year-to-year carbon black selling prices.
The effect of a 6% global increase in specialty chemicals volumes was more than
offset by lower selling prices, primarily in the Company's European and Asia
Pacific

                                                                           23


<PAGE>   4


- --------------------------------------------------------------------------------
management's discussion and analysis of financial condition and results of 
operations (continued)

- --------------------------------------------------------------------------------


carbon black markets. Sales growth in the fumed silica and microelectronics
materials businesses was partially offset by a decline in sales of plastics and
tantalum capacitor materials.

     The Company has been developing and commercializing new high-value,
differentiated products in its specialty chemicals businesses. Five-year new
products (defined as products that were first sold in commercial quantities
within the last five years) accounted for approximately 11% of specialty
chemical revenues in 1998, compared with 9% in 1997, and 8% in 1996. The Company
continues to vigorously pursue a number of new product and new business
opportunities.

     Operating profit for the Specialty Chemicals and Materials Group totaled
$226 million, $199 million and $261 million in 1998, 1997 and 1996,
respectively. Operating profit, before special items, increased 14% in 1998 on
6% greater volumes. The Company's carbon black business reported a modest
increase in operating profit as a result of increased volumes, primarily in
North America and Europe. The effect of lower year-to-year carbon black selling
prices more than offset the effect of lower feedstock costs. The Company's fumed
silica, microelectronics materials, performance materials and plastics
businesses all experienced improved operating results for the year.


                               [GRAPHIC OMITTED]


     In 1997, the Company's carbon black operations accounted for most of the
year-to-year decline in operating profit. Lower European and Asia Pacific
selling prices, higher raw material costs, increased plant start-up costs, and a
stronger U.S. dollar more than offset the benefits of greater volumes.

     The CARBON BLACK business reported a modest increase in operating profit
before special items in 1998 despite the negative effects of weak Asia Pacific
demand and a strengthened U.S. dollar. Overall volumes increased 3% year over
year, however, the carbon black business continued to experience lower
year-to-year margins, as the effect of lower selling prices more than offset
lower feedstock costs. Overall selling prices were down 4% during 1998. In
addition, feedstock costs during 1998 were on average 9% lower.

     The carbon black business's operating profit decreased 23% in 1997 from
1996. Lower selling prices, coupled with higher raw material costs and increased
plant start-up costs, more than offset volume gains and reductions in spending
on research and development, and market development initiatives.

     The Company's FUMED SILICA business reported increased sales in 1998 and
1997 of 4% and 15%, respectively. The increases in 1998 and 1997 were primarily
the result of higher volumes coupled with higher prices and increased sales of
new products. Operating profit increased 20% and 8% in 1998 and 1997,
respectively, due to higher gross margins, partially offset by increased
spending to support a new market segmentation strategy. The Company's purchase
of its former partner's 50% interest in the Rheinfelden, Germany, fumed silica
plant contributed significantly to improved operating results in 1998.

     In the PLASTICS business, sales were flat and operating profit increased
20% in 1998. Improved product mix and cost reduction efforts contributed to the
earnings improvement in this business in 1998. Sales and operating profit in
1997 were down 6% and 15%, respectively from 1996. Higher volumes in 1997 were
more than offset by lower selling prices. Severe pricing pressure that began in
1996 continued throughout 1997.

     Sales and operating profit of the PERFORMANCE MATERIALS business, which
primarily manufactures tantalum products for the electronic capacitors industry,
increased 15% and 56%, respectively, in 1998. Volumes increased 19% during 1998,
reflecting strengthened demand for capacitors from the U.S. electronics
industry. The effects of increased volumes were partially offset by increased
new product development spending.

     Sales increased 4% and operating profit decreased 23% in 1997. Lower
volumes and higher material costs were partially offset by higher overall
selling prices. During the second half of 1996 and the first half of 1997,
volumes were weak due to a slowdown in the U.S. electronics market and inventory
surpluses downstream in the tantalum supply chain.

     The Company's MICROELECTRONICS MATERIALS business reported a significant
growth in sales and operating profit. In 1998, this business experienced a 61%
increase in volumes. Operating profit improved significantly in 1998 due to
increased volumes and improved plant utilization, offset somewhat by higher
spending on research and development, and market development initiatives.
Positive operating profit was reported for the first time in this business in
1996. The Company expects continued significant sales growth in this business
during 1999* (see page 29).


  24


<PAGE>   5


- --------------------------------------------------------------------------------
management's discussion and analysis of financial condition and results of 
operations (continued)

- --------------------------------------------------------------------------------


     The Company's SPECIALTY FLUIDS business unit is developing cesium-based
drilling and completion fluids, and markets those fluids to the oil well
drilling and services industry. The Company's cesium processing plant located at
a mine owned by a Cabot subsidiary in Manitoba, Canada, has been producing
commercial quantities of brine fluids that are now available for tests expected
to be conducted during the first quarter of calendar 1999. Commercial sales of
the product are expected to begin in the latter part of 1999* (see page 29).

Energy

The LNG business conducts liquefied natural gas importing, storing, transporting
and marketing operations. In prior years, the LNG business, together with the
Company's TUCO coal services business, formed the Company's Energy Group. The
Company sold TUCO, effective September 30, 1996. During 1996, TUCO earned $14
million of operating profit.

     The LNG business reported sales and operating profit of $211 million and
$15 million, respectively in 1998, compared with $200 million and $6 million,
respectively, in 1997. The increase in earnings in 1998 is primarily due to a
more ample and assured supply of LNG than in previous years, which enabled
management to contract firm sales commitments for a greater amount of LNG during
the winter season. Customers pay a premium over the commodity natural gas prices
in order to secure firm commitments for delivery. In the second half of the
year, operating results were negatively affected by lower than usual summer gas
prices and a weak summer liquid refill market due to an unusually warm winter.
The LNG business supplied the New England gas market with 17 cargoes in 1998
versus 18 cargoes in 1997.

     In 1997, revenue increased to $200 million from $144 million in 1996. The
increase in revenue was due to significantly greater volumes and higher gas
prices. The business received 18 LNG cargoes in 1997 compared with 10 cargoes in
1996. Gas volumes sold increased 36% year-to-year. Operating profit increased to
$6 million during 1997, from $3 million during 1996. In 1996, operating profit
excluded $6 million of special items. The positive earnings effect of higher
volumes and prices was partially offset by higher gas costs.

     The profitability of the LNG business during the next year, until its
Trinidad LNG supply becomes available during the second half of fiscal 1999,
depends in large part on its LNG supply from Algeria. To date, the political
instability in Algeria has not interrupted the operations of the Company's
Algerian LNG supplier* (see page 29).

Risk Management

The Company's objective in managing its exposure to interest rate changes,
foreign currency rate changes and commodity price changes is to limit the impact
of the changes on cash flows and earnings. To achieve its objectives, the
Company identifies these risks and manages them through its regular operating
and financing activities and, when deemed appropriate, through the use of
derivative financial instruments. The Company enters into contracts with
customers and suppliers that are designed to limit the risk of certain foreign
currency rate and commodity price changes. The Company enters into certain
contracts in the carbon black business in which the price of the product is
adjusted based on certain movements in feedstock. The LNG business enters into
certain supply contracts where the purchase price of the LNG is adjusted based
on the final selling price. Certain contracts in the Company's foreign
subsidiaries are denominated in the U.S. dollar or a currency other than the
functional currency of the subsidiary. Additionally, the Company attempts to
limit its net monetary exposure in currencies of hyperinflationary countries,
primarily in South America and Asia.

     The Company determines the net worldwide exposures to interest rate
changes, foreign currency rate changes, and commodity price changes and limits
the impact of rate and price changes through the use of derivative financial
instruments. When entered into, these financial instruments are generally
designated as hedges of underlying exposures associated with specific assets,
liabilities, or firm commitments and are monitored to determine if they remain
effective hedges. Market risk exposure to other financial instruments of the
Company are not material to earnings, cash flow or fair values.

Foreign Currency

The Company's international operations are subject to certain opportunities and
risks, including currency fluctuations and government actions. The Company
closely monitors its operations in each country so it can effectively respond to
changing economic and political environments and to fluctuations in foreign
currencies. The primary currencies to which the Company is exposed, and that it
primarily hedges, include the German deutschemark and other European currencies
and, to a lesser extent, South American and Asian currencies. Accordingly, the
Company utilizes foreign currency option contracts and forward contracts to
hedge its exposure primarily on receivables and payables denominated in
currencies other than the entities' functional currencies and on anticipated
transactions and firm com-


                                                                            25


<PAGE>   6
- --------------------------------------------------------------------------------
management's discussion and analysis of financial condition and results of 
operations (continued)
- --------------------------------------------------------------------------------

mitments. The Company monitors its foreign exchange exposures to ensure the
overall effectiveness of its foreign currency hedge positions.

Interest Rates

The Company's objective in managing its exposure to interest rate changes is to
limit the impact of interest rate changes on earnings and cash flows and to
lower its overall borrowing costs. To achieve its objectives, the Company uses
interest rate swaps to hedge and/or lower financing costs and to adjust fixed
and variable rate debt positions. The Company maintains the percentage of fixed
and variable rate debt within defined parameters.

Commodity

The Company has price risk exposure due to changes in its natural gas sales
prices and supply costs. The Company enters into commodity futures contracts to
hedge its gross margin exposure. The Company utilizes commodity futures
contracts for hedging firmly committed and anticipated transactions and monitors
its exposure daily to ensure overall effectiveness of its hedge positions.

Value At Risk

The Company utilizes a Value-at-Risk ("VAR") model to determine the maximum
potential loss in the fair value of its interest rate, commodity and foreign
exchange sensitive derivative financial instruments. (see Note O to the
Consolidated Financial Statements regarding the Company's financial instruments
as of September 30, 1998). The Company's computations for each type of exposure
were based on the interrelationships between movements in various currencies,
commodities and interest rates. These interrelationships were determined by
observing interest rate, commodity and foreign currency market changes over
corresponding periods. The firm and anticipated transactions, assets and
liabilities, denominated in foreign currencies, which are hedged by the
derivative financial instruments, were excluded from the model. The VAR model
estimates were made assuming normal market conditions and a 95% confidence
level. There are various modeling techniques which can be used in the VAR
computation. The Company's computations are based on the Monte Carlo simulation.
The VAR model is a risk analysis tool and does not purport to represent actual
losses in fair value that will be incurred by the Company, nor does it consider
the potential effect of favorable changes in market factors. The Company's VAR
models estimate a maximum loss in market value for each type of derivative
instrument held as of September 30, 1998. The results of the VAR models are as
follows:

                                          Maximum Loss          Period
============================================================================
Foreign currency                         $0.4 million         two weeks

Interest Rate                            $ 12 million         six months
 
Commodity                                $  1 million         one month
============================================================================

     At no time during the year did the change in market value of these
instruments exceed the VAR measure stated above.

     Management does not foresee or expect any significant changes in the
management of hedging instruments relating to foreign currency, commodity or
interest rate exposures or in the strategies it employs to manage such exposures
in the near future* (see page 29).

     Since the Company utilizes currency, interest rate and commodity sensitive
derivative instruments for hedging, a loss in fair value for those instruments
is generally offset by increases in the value of the underlying transaction.

Euro

On January 1, 1999, eleven of fifteen member countries of the European Union are
scheduled to establish fixed conversion rates between their existing currencies
("legacy currencies") and one common currency, the euro. The euro will then
trade on currency exchanges and may be used in business transactions. The
conversion to the euro will eliminate currency exchange rate risk among the
eleven member countries. Beginning in January 2002, new euro-denominated bills
and coins will be issued. The Company's business units affected by the euro
conversion have established plans to address the issues raised by the euro
currency conversion. These issues include, among others, the need to adapt
computer and financial systems, business processes and equipment, and the need
to accommodate euro-denominated transactions and the impact of one common
currency on product pricing, taxation and governmental and legal regulations.
The Company does not expect the system and equipment conversion costs to be
material to its financial condition, results of operations or cash flows. Due to
numerous uncertainties, the Company cannot reasonably estimate the effects one
common currency will have on pricing and the resulting impact, if any, on its
financial condition, results of operations or cash flows* (see page 29).

Cash Flow and Liquidity

Cash generated in 1998 from the Company's operating activities increased to $236
million from $144 million in 1997. Cash gener-

  26
<PAGE>   7


- --------------------------------------------------------------------------------
management's discussion and analysis of financial condition and results of 
operations (continued)
- --------------------------------------------------------------------------------


ated from operations was used substantially to fund capital spending and
repurchases of the Company's common stock.

     Research and technical service spending for 1998, 1997 and 1996 was $83
million, $83 million and $80 million, respectively. Spending, as a percentage of
the Specialty Chemicals and Materials Group revenues, was approximately 6% in
1998, 1997 and 1996. The Company is committed to the development of new,
differentiated products for its specialty chemicals businesses. The Company
anticipates research and development spending to remain near $80 million in 1999
for these and other initiatives* (see page 29).

     Capital spending on property, plant and equipment, and investments and
acquisitions for 1998, 1997 and 1996 was $247 million, $181 million and $269
million, respectively. The major components of the 1998 capital program included
new business expansion spending, the Company's share of a natural gas
liquefaction project in Trinidad, refurbishment of the Company's LNG tanker,
capacity expansion in the Company's fumed silica business and normal plant
operating capital projects.


                               [GRAPHIC OMITTED]


     Although the Company expects to continue to invest in new business
opportunities, it expects to decrease the rate of capital spending in 1999 from
1998. These expenditures are expected to include portions of the projects
mentioned in the preceding paragraph and several new business initiatives. In
addition to normal plant operating projects, the Company expects 1999
expenditures to include environmental compliance costs in North America* (see
page 29).

     Over the next several years, the Company also expects to spend a
significant portion of its $36 million environmental reserve in connection with
remediation at various environmental sites. These sites are primarily associated
with divested businesses* (see page 29).

     In 1998, the Company sold 2.3 million shares of K N Energy, Inc. ("KNE")
and recognized a $90 million gain from the sale of those securities. Proceeds
from the sale were used to repay debt. The Company continues to own
approximately 650,000 shares of KNE common stock.

     In October 1997, the Company issued $50 million of notes maturing as
follows: $25 million mature in 30 years and $25 million mature in 30 years with
a one-time put option 7 years from issuance. Proceeds from the issuance were
used to reduce short-term debt.

                               [GRAPHIC OMITTED]

     On September 29, 1998, the Company filed a shelf registration statement
with the Securities and Exchange Commission ("SEC") for up to $500 million of
debt securities which the Company may issue from time to time. The SEC declared
the registration statement effective on October 13, 1998.

     On September 11, 1998, the Company's Board of Directors authorized the
repurchase of 4 million shares of its common stock. As of September 30, 1998,
approximately 3.3 million shares remained available for purchase under the Board
authorization.

     During 1998, the Company repurchased 3.8 million shares of its common stock
for a total of $101 million. During 1997, 3.5 million shares were repurchased
for a total of $85 million. During 1996, 3 million shares were repurchased for a
total of approximately $122 million. The Company's common stock repurchase 
activity is expected to continue in 1999* (see page 29).

     During 1998, the Company paid cash dividends of $0.42 per share. In
November 1998, the Board of Directors approved an $0.11 per share dividend
payable in the first quarter of fiscal year 1999.

     The ratio of total debt (including short-term debt net of cash) to capital
was 43% at the end of 1998 and 1997.

     The Company maintains a credit agreement under which the Company may borrow
up to $300 million at floating rates. This facility is available through January
3, 2002. The Company had no borrowings outstanding under this line at September
30, 1998.


                                                                            27


<PAGE>   8


- --------------------------------------------------------------------------------
management's discussion and analysis of financial condition and results of 
operations (continued)
- --------------------------------------------------------------------------------



Management expects cash from operations and present financing arrangements,
including the Company's unused line of credit and shelf registration, to be
sufficient to meet the Company's cash requirements for the foreseeable future*
(see page 29).

Year 2000 Readiness Disclosure

As the millennium approaches, there is growing public attention concerning the
impact that the Year 2000 date change could have on all organizations that rely,
directly or indirectly, on computerized systems to help run their operations.
This issue may have a direct impact on computer systems that affect safety at a
company's plants, systems that enable key suppliers to provide raw material and
parts, and systems that assist a company to make and ship product and account
for revenue and costs.

     In evaluating its Year 2000 readiness, the Company has developed a program
to inventory, assess, remediate and test its core business systems, information
technology infrastructure (IT) and embedded plant systems. Core business systems
are those software and hardware systems that record relevant data for business
operations and summarize revenue, cost, cash flow, capital and other
information. Information technology infrastructure refers primarily to computer
hardware and software used in the desktop environment. Embedded plant systems
are all computer based controls and equipment which are embedded within a
plant's manufacturing equipment and systems.

     The Company carried out an inventory of its core business systems in order
to assess such systems' Year 2000 readiness. The Company's assessment indicated
that, as a result of investments in significant systems renewals during the past
several years, many of the Company's core business systems are Year 2000 ready.
Although some of the Company's older core business systems required replacement
or remedial action, such replacement or remedial action is continuing under the
Company's Year 2000 program, to be completed in 1999. The Company is now
performing concurrent inventory, assessment and remediation for its information
technology infrastructure and embedded systems. Testing of these systems in
concert will occur as the remediation process progresses. The Company expects to
complete all phases of its Year 2000 program before the millennium.

     The Company does not believe that the cost of implementing system and
program changes specifically necessary to address Year 2000 issues will have a
material effect on the Company's results of operations or financial condition.
During fiscal year 1998, the Company recognized costs of approximately $1
million that it would not have spent but for the Year 2000 issue. The Company
expects to spend approximately $2 million during fiscal year 1999. There can be
no assurance that there will not be increased costs associated with the
implementation of such program changes.

     The Company cannot predict reliably the source, nature or extent of any
Year 2000 disruptions that may be experienced in the U.S. or other countries
where it operates and, therefore, cannot predict reliably the effect any such
disruptions may have on the Company, its operations or financial condition. The
Company does not know what is the most likely "worse case scenario" as a result
of Year 2000 disruptions, but believes that the effects on the Company are not
substantially different from those facing industry generally. The Company
believes that the most likely causes of disruption are one or more of the
following: disruptions in the banking system, disruptions in the supply of
electricity to the Company's plants that could delay production of the Company's
products and disruptions in transportation services that could delay shipments
from the Company's suppliers or to the Company's customers. In addition, the
Company does not know whether any of its customers will experience Year 2000
disruptions either directly or as a result of disruptions in their customers'
businesses or in the economy generally, but any such disruptions might reduce
demand for the Company's products and adversely affect the Company. At this
time, however, the Company believes that if none of the third parties with which
it deals, directly or indirectly, experience disruptions or delays related to
the Year 2000 problem, it will be able to continue to operate with little or no
disruption or delay.

     The Company has made appropriate inquiries of all of its critical
information technology vendors (hardware and software) and is in the process of
making inquiries concerning the Year 2000 readiness of certain suppliers. Even
in cases where the Company has received assurances that delays or disruption
will not be encountered by third parties, the Company is not in a position to
determine with certainty whether the assurances will prove accurate, given the
uncertainties associated with the Year 2000.

     The Company is identifying those areas where it will develop contingency
plans. Because such plans necessarily depend on the Company's then state of
readiness with respect to the Year 2000 issues and the information it then has
with respect to third parties and other external factors, those plans will
likely continue to evolve until even after December 31, 1999. In addition, many
of the Company's contingency plans will of necessity depend on the continued
operation of various third parties, in which case such contingency plans may be
hindered by Year 2000 disruptions affecting such third parties.


  28


<PAGE>   9


New Accounting Standards

In June 1997, the Financial Accounting Standards Board ("FASB") issued Statement
of Financial Accounting Standards No. 130, "Reporting Comprehensive Income"
("SFAS 130"). The statement, which must be adopted for periods beginning after
December 15, 1997, establishes standards for reporting and display of
comprehensive income and its components in consolidated financial statements.
The effect of adopting SFAS 130 is not expected to be material to the Company's
financial position or results of operations.

     In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 131, "Disclosures about Segments of an Enterprise and Related Information"
("SFAS 131"), which must be adopted for periods beginning after December 15,
1997. Under the new standard, companies will be required to report certain
information about operating segments in consolidated financial statements.
Operating segments will be determined based on the way that management organizes
its business for making operating decisions and assessing performance. The
standard also requires that companies report certain information about their
products and services, the geographic areas in which they operate, and their
major customers. The Company is currently evaluating the effect of implementing
SFAS 131.

     In February 1998, FASB issued Statement of Financial Accounting Standards
No. 132, "Employers' Disclosures about Pensions and Other Postretirement
Benefits" ("SFAS 132"), which revises employers' disclosures about pension and
other postretirement benefit plans. It significantly changes current financial
statement disclosure requirements under SFAS No. 87, "Employers' Accounting for
Pensions," SFAS No. 88, "Employers' Accounting for Settlements and Curtailments
of Defined Benefit Pension Plans and for Termination Benefits," and SFAS No.
106, "Employers' Accounting for Postretirement Benefits Other Than Pensions."
SFAS No. 132 standardizes the disclosure requirements for pensions and other
postretirement benefits to the extent practicable, requires additional
information on changes in the benefit obligations and fair values of plan assets
that will facilitate financial analysis, and eliminates certain disclosures that
are no longer useful. It does not change the measurement or recognition of those
plans. The Statement is effective for fiscal years beginning after December 15,
1997.

     In June 1998, the FASB issued Statement of Financial Accounting Standards
No. 133, "Accounting for Derivative Instruments and Hedging Activities" ("SFAS
133"), which establishes accounting and reporting standards for derivative
instruments, including certain derivative instruments embedded in other
contracts and for hedging activities. This Statement is effective for all
fiscal quarters of fiscal years beginning after June 15, 1999. The Company is
currently evaluating the effect of implementing SFAS 133.

     In March 1998, the Accounting Standards Executive Committee ("AcSEC")
issued Statement of Position 98-1 "Accounting for the Costs of Computer Software
Developed or Obtained for Internal Use" ("SOP 98-1"). The SOP is applicable to
the Company beginning in fiscal 2000. The Company engages in ongoing update,
enhancement and replacement of its computer systems. Currently, the Company
capitalizes external costs associated with services and software incurred in
connection with these activities which are significant. To date, internal
resources associated with these activities have not been significant. The
Company is currently evaluating the effect of implementing SOP 98-1.

     In April 1998, AcSEC issued Statement of Position 98-5, "Accounting for the
Costs of Start-Up Activities" ("SOP 98-5"), which requires all costs of start-up
activities to be expensed as incurred. SOP 98-5 is effective for years beginning
after December 15, 1998. The adoption of this SOP by the Company will be
reflected as a cumulative effect of a change in accounting principle. The
Company is currently evaluating the effect of implementing SOP 98-5.

*Forward Looking Information

Included herein are statements relating to management's projections of future
profits, the possible achievement of the Company's financial goals and
objectives, management's expectations for the Company's product development
program, Year 2000 risks and the impact of the euro conversion. Actual results
may differ materially from the results anticipated in the statements included
herein due to a variety of factors, including market supply and demand
conditions, fluctuations in currency exchange rates, cost of raw materials,
patent rights of others, Year 2000 disruptions, demand for our customers'
products and competitors' reactions to market conditions. Timely
commercialization of products under development by the Company may be disrupted
or delayed by technical difficulties, market acceptance, competitors' new
products, as well as difficulties in moving from the experimental stage to the
production stage. The risk management discussion and the estimated amounts
generated from the analyses are forward-looking statements of market risk
assuming certain adverse market conditions occur. Actual results in the future
may differ materially from these projected results due to actual developments in
the global financial markets. The methods used by the Company to assess and
mitigate risks should not be considered projections of future events or losses.

                                                                            29


<PAGE>   10
- --------------------------------------------------------------------------------
consolidated balance sheets
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>

                                                                                                      -----------------------------
September 30                                                                                              1998           1997
===================================================================================================================================
Dollars in millions

<S>                                                                                                   <C>             <C>   
ASSETS
Current assets:
   Cash and cash equivalents                                                                          $   39.6        $   39.2
   Accounts and notes receivable (net of reserve for doubtful accounts of $4.6 and $5.6)                 284.3           288.6
   Inventories (Note C)                                                                                  251.1           246.9
   Prepaid expenses                                                                                       26.1            23.4
   Deferred income taxes (Note L)                                                                         17.8            15.2
- -----------------------------------------------------------------------------------------------------------------------------------
     Total current assets                                                                                618.9           613.3
- -----------------------------------------------------------------------------------------------------------------------------------



Investments:
   Equity (Notes B and D)                                                                                 91.1            86.1
   Other (Notes D and N)                                                                                  72.5           146.6
- -----------------------------------------------------------------------------------------------------------------------------------
     Total investments                                                                                   163.6           232.7
- -----------------------------------------------------------------------------------------------------------------------------------

Property, plant and equipment (Note E)                                                                 1,914.3         1,759.8
   Accumulated depreciation and amortization                                                            (936.3)         (837.5)
- -----------------------------------------------------------------------------------------------------------------------------------
     Net property, plant and equipment                                                                   978.0           922.3



Other assets:
   Intangible assets (net of accumulated amortization of $16.0 and $12.4) (Note B)                        24.2            39.1
   Deferred income taxes (Note L)                                                                          3.9             4.2
   Other assets                                                                                           16.6            14.1
- -----------------------------------------------------------------------------------------------------------------------------------
     Total other assets                                                                                   44.7            57.4



Total assets                                                                                          $1,805.2        $1,825.7
===================================================================================================================================
</TABLE>


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


  30


<PAGE>   11


- --------------------------------------------------------------------------------
                                                   consolidated balance sheets
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>

                                                                                ---------------------------
September 30                                                                         1998            1997
===========================================================================================================
Dollars in millions

<S>                                                                            <C>             <C>       
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
   Notes payable to banks                                                      $    253.3      $    200.8
   Current portion of long-term debt (Note G)                                        11.4           115.0
   Accounts payable and accrued liabilities (Notes F and H)                         268.2           223.9
   U.S. and foreign income taxes                                                      0.4             2.8
   Deferred income taxes (Note L)                                                     3.0             1.0
- -----------------------------------------------------------------------------------------------------------
     Total current liabilities                                                      536.3           543.5
- -----------------------------------------------------------------------------------------------------------

Long-term debt (Note G)                                                             316.3           285.5
Deferred income taxes (Note L)                                                       82.4            99.2
Other liabilities (Notes H, K and N)                                                139.6           146.9


Commitments and contingencies (Note N)


Minority interest                                                                    25.1            22.8


Stockholders' equity (Notes D, G, I and K):
Preferred stock:
   Authorized: 2,000,000 shares of $1 par value
     Series A Junior Participating Preferred Stock
       Issued and outstanding: none
     Series B ESOP Convertible Preferred Stock 7.75% Cumulative
       Issued: 75,336 shares (aggregate redemption value of $67.4 and $69.4)         75.3            75.3


Less cost of shares of preferred treasury stock                                     (13.6)           (9.4)
Common stock:
   Authorized: 200,000,000 shares of $1 par value
   Issued: 67,241,624 and 135,549,936 shares                                         67.2           135.5
Additional paid-in capital                                                            4.9            39.3
Retained earnings                                                                   671.7         1,238.2
Less cost of common treasury stock                                                     --          (705.4)
Unearned compensation                                                               (26.2)          (18.3)
Deferred employee benefits                                                          (60.6)          (62.5)
Unrealized gain on marketable securities                                             16.7            53.9
Foreign currency translation adjustments                                            (29.9)          (18.8)
- -----------------------------------------------------------------------------------------------------------
   Total stockholders' equity                                                       705.5           727.8
- -----------------------------------------------------------------------------------------------------------
Total liabilities and stockholders' equity                                     $  1,805.2      $  1,825.7
===========================================================================================================
</TABLE>

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


                                                                            31


<PAGE>   12


- --------------------------------------------------------------------------------
consolidated statements of income
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                             -----------------------------------------------
Years ended September 30                                                            1998             1997             1996
============================================================================================================================
Dollars in millions, except per share amounts

<S>                                                                            <C>              <C>              <C>      
Revenues:
   Net sales and other operating revenues                                      $ 1,647.8        $ 1,630.0        $ 1,856.3
   Interest and dividend income (Notes D and O)                                      5.0              6.7              8.9
- ----------------------------------------------------------------------------------------------------------------------------
     Total revenues                                                              1,652.8          1,636.7          1,865.2
============================================================================================================================



Costs and expenses:
   Cost of sales                                                                 1,120.9          1,144.4          1,310.0
   Selling and administrative expenses                                             229.7            216.5            206.9
   Research and technical service                                                   82.7             82.7             79.6
   Interest expense (Notes G and O)                                                 42.0             43.2             41.7
   Special items (Note B)                                                           85.0             18.2               --
   Gain on sale of equity securities (Note D)                                      (90.3)              --            (28.3)
   Gain on sale of business (Note B)                                                  --               --            (38.9)
   Other charges, net                                                               14.8             14.6             14.4
- ----------------------------------------------------------------------------------------------------------------------------
     Total costs and expenses                                                    1,484.8          1,519.6          1,585.4
============================================================================================================================



Income before income taxes                                                         168.0            117.1            279.8
Provision for income taxes (Note L)                                                (60.5)           (42.1)           (98.2)
Equity in net income of affiliated companies (Note D)                               17.0             19.5             18.5
Minority interest                                                                   (2.9)            (1.7)            (6.0)
- ----------------------------------------------------------------------------------------------------------------------------
     Net income                                                                    121.6             92.8            194.1
============================================================================================================================



Dividends on preferred stock, net of tax benefit of $2.0, $2.1 and $2.1             (3.2)            (3.3)            (3.3)
- ----------------------------------------------------------------------------------------------------------------------------
     Income applicable to common shares                                        $   118.4        $    89.5        $   190.8
============================================================================================================================



Weighted average common shares outstanding, in millions (Notes I and J):
   Basic                                                                            65.6             67.5             69.6
   Diluted                                                                          74.6             76.7             79.3


Income per common share (Note J):
   Basic                                                                       $    1.80        $    1.33        $    2.74
   Diluted                                                                     $    1.61        $    1.19        $    2.42
============================================================================================================================
</TABLE>


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




  32


<PAGE>   13


- --------------------------------------------------------------------------------
                                        consolidated statements of cash flows
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                  -----------------------------------------
Years ended September 30                                                                1998          1997           1996
- ---------------------------------------------------------------------------------------------------------------------------
Dollars in millions

<S>                                                                                  <C>           <C>           <C>
CASH FLOWS FROM OPERATING ACTIVITIES
Net income                                                                            $121.6        $ 92.8       $ 194.1
Adjustments to reconcile net income to cash provided by operating activities:
     Depreciation and amortization                                                     115.4         109.9          97.0
     Deferred tax expense (benefit)                                                     12.0         (13.2)          3.7
     Equity in income of affiliated companies, net of dividends received                (9.5)         (9.1)         (5.6)
     Special items                                                                      60.0          18.2            --
     Gain on sale of equity securities                                                 (90.3)           --         (28.3)
     Gain on sale of business                                                             --            --         (38.9)
     Other, net                                                                         11.7           8.2           8.8
   Changes in assets and liabilities, net of the effect of the consolidation of
     equity affiliates and excluding assets and liabilities of businesses sold:
     Decrease (Increase) in accounts and notes receivable                                7.6         (28.9)          0.1
     Decrease (Increase) in inventories                                                 (3.2)          2.7         (39.0)
     Increase (Decrease) in accounts payable and accrued liabilities                    30.8         (22.6)         (3.4)
     Other, net                                                                        (19.7)        (13.8)        (36.6)
- ---------------------------------------------------------------------------------------------------------------------------
Cash provided by operating activities                                                  236.4         144.2         151.9
===========================================================================================================================



CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property, plant and equipment                                            (187.4)       (162.8)       (209.1)
Proceeds from sales of property, plant and equipment                                     6.3           1.1           2.8
Purchases of equity securities                                                         (20.2)        (11.3)           --
Proceeds from sales of equity securities                                               129.5            --          57.6
Investments and acquisitions, excluding cash acquired                                  (39.2)         (7.3)        (59.5)
Proceeds from sale of business                                                            --          35.0            --
Cash from consolidation of equity affiliates and other                                   1.9            --          11.2
- ---------------------------------------------------------------------------------------------------------------------------
Cash used by investing activities                                                     (109.1)       (145.3)       (197.0)
- ---------------------------------------------------------------------------------------------------------------------------



CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt                                                            63.1          90.0           9.8
Repayments of long-term debt                                                          (133.5)        (21.5)        (40.2)
Net increase in short-term debt                                                         52.5          16.7         168.6
Purchases of treasury stock                                                           (105.2)        (85.8)       (123.5)
Sales and issuances of treasury stock                                                   24.4          16.7          28.6
Cash dividends paid to stockholders                                                    (31.7)        (31.3)        (30.5)
- ---------------------------------------------------------------------------------------------------------------------------
Cash provided (used) by financing activities                                          (130.4)        (15.2)         12.8
- ---------------------------------------------------------------------------------------------------------------------------



Effect of exchange rate changes on cash                                                  3.5          (2.6)         (0.4)
- ---------------------------------------------------------------------------------------------------------------------------
Increase (Decrease) in cash and cash equivalents                                         0.4         (18.9)        (32.7)
Cash and cash equivalents at beginning of year                                          39.2          58.1          90.8
- ---------------------------------------------------------------------------------------------------------------------------
Cash and cash equivalents at end of year                                              $ 39.6        $ 39.2       $  58.1
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>


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


                                                                            33

<PAGE>   14

- --------------------------------------------------------------------------------
notes to consolidated financial statements
- --------------------------------------------------------------------------------


Note A Significant Accounting Policies

The consolidated financial statements have been prepared in conformity with
generally accepted accounting principles. The significant accounting policies of
Cabot Corporation (the "Company") are described below.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and
majority-owned and controlled U.S. and non-U.S. subsidiaries. Investments in
majority-owned affiliates where control does not exist and investments in 20
percent to 50 percent owned affiliates are accounted for on the equity method.
Intercompany transactions have been eliminated.

Cash Equivalents

Cash equivalents include all highly liquid investments with a maturity of three
months or less at date of acquisition.

Inventories

Inventories are stated at the lower of cost or market. The cost of most U.S.
inventories is determined using the last-in, first-out ("LIFO") method. The cost
of other U.S. and all non-U.S. inventories is determined using the average cost
method or the first-in, first-out ("FIFO") method. (Note C)

Investments

Investments include investments in equity affiliates, investments in equity
securities, and investments accounted for under the cost method. Investments in
equity securities are classified as available-for-sale and are recorded at their
fair market values. Accordingly, any unrealized holding gains and losses, net of
taxes, are excluded from income and recognized as a separate component of
stockholders' equity. The fair value of equity securities is determined based on
market prices at the balance sheet dates. The cost of equity securities sold is
determined by the specific identification method. (Notes D and I)

Property, Plant and Equipment

Property, plant and equipment are recorded at cost. Depreciation of property,
plant and equipment is generally calculated on the straight-line method for
financial reporting purposes. The depreciable lives for buildings, machinery and
equipment, and other fixed assets are 20 to 25 years, 10 to 20 years and 3 to 20
years, respectively. (Note E)

Intangible Assets

Intangible assets are comprised of the cost of business acquisitions in excess
of the fair value assigned to the net tangible assets acquired and the costs of
technology, licenses and patents purchased in business acquisitions. The excess
of cost over the fair value of net assets acquired is amortized on the
straight-line basis over the shorter of the estimated useful life or 40 years.
Other intangibles are amortized over their estimated useful lives. Included in
other charges is amortization expense for 1998, 1997 and 1996, of $5.3 million,
$5.0 million and $4.8 million, respectively. (Note B)

Impairment of Long-Lived Assets

The Company reviews long-lived assets for impairment whenever events or changes
in business circumstances indicate that the carrying amount of the assets may
not be fully recoverable. Each impairment test is based on comparison of
undiscounted cash flows to the recorded value of the asset. If an impairment is
indicated, the asset is written down to its fair value. (Note B)

Foreign Currency Translation

Substantially all assets and liabilities of foreign operations are translated
into U.S. dollars at exchange rates in effect at the balance sheet dates.
Unrealized currency translation adjustments are accumulated in a separate
component of stockholders' equity. Income and expense items are translated at
average exchange rates during the year. Foreign currency gains and losses
arising from transactions are reflected in net income. Included in other charges
for 1998, 1997 and 1996 are foreign exchange losses of $6.6 million, $6.1
million and $2.6 million, respectively. The financial statements of foreign
operations that operate in hyperinflationary economies are translated at either
current or historical exchange rates, as appropriate. These currency adjustments
are included in net income. (Note I)


  34


<PAGE>   15

- --------------------------------------------------------------------------------
                        notes to consolidated financial statements (continued)
- --------------------------------------------------------------------------------


Financial Instruments

Derivative financial instruments are used by the Company to manage its interest
rate and foreign currency exposures, and to a lesser extent, commodity prices.
Interest rate swaps are employed to achieve the Company's interest rate
objectives. The interest differential to be paid or received under the related
interest rate swap agreements is recognized over the life of the related debt
and is included in interest expense or income. Realized gains and losses on
foreign currency instruments, that are effective as hedges of net cash flows in
foreign operations, are recognized in income as the instruments mature. Realized
and unrealized gains and losses on forward currency contracts, that are
effective as hedges of assets and liabilities, are recognized in income.
Realized gains and losses on foreign currency instruments, that are hedges of
committed transactions, are recognized at the time the underlying transaction is
completed. Commodity futures and forward contracts are used by the Company, on
occasion, to hedge the procurement of raw materials, primarily feedstock, and to
hedge the sale of liquefied natural gas. Realized gains and losses on commodity
futures and forward contracts on qualifying hedges are included as a component
of raw materials or sales revenues, as appropriate, and are recognized when the
related materials are purchased or sold. (Note O)

Fair Values of Financial Instruments

The recorded amounts of cash and cash equivalents, receivables, investments in
securities, accounts payable, and short-term debt approximate their fair values.
The fair value of long-term debt and derivatives is based upon third party
sources. Fair values received from third party sources are estimated by
appropriate valuation techniques based on information available. The fair-value
estimates do not necessarily reflect the values the Company could realize in the
current market. (Notes G and O)

Revenue Recognition

Revenues are recognized when finished products are shipped to unaffiliated
customers or services have been rendered, with appropriate provision for
uncollectible accounts.

Income Taxes

Deferred income taxes are determined based on the estimated future tax effects
of differences between financial statement carrying amounts and the tax bases of
existing assets and liabilities. Provisions are made for the U.S. income tax
liability and additional non-U.S. taxes on the undistributed earnings of
non-U.S. subsidiaries, except for amounts the Company has designated to be
permanently reinvested. (Note L)

Stock-Based Compensation

In accordance with the provisions of Statement of Financial Accounting Standards
No. 123, "Accounting for Stock-Based Compensation" ("SFAS No. 123"), the Company
has elected to account for stock-based compensation plans consistent with
Accounting Principles Board Opinion No. 25, "Accounting for Stock Issued to
Employees" ("APB No. 25"), and related Interpretations in accounting, and
accordingly, does not recognize compensation cost. The Company discloses the
summary of pro forma effects to reported net income and earnings per share for
1998, 1997 and 1996 as if the Company had elected to recognize compensation cost
based on the fair value of the options granted at grant date as prescribed by
SFAS No. 123. (Note K)

Year 2000 Costs

Costs of modifying computer software for Year 2000 compliance are expensed as
they are incurred.

Earnings Per Share

During the quarter ended December 31, 1997, the Company adopted Statement of
Financial Accounting Standards No. 128, "Earnings per Share" ("SFAS No. 128").
SFAS No. 128 establishes standards for computing and presenting earnings per
share ("EPS") and requires the presentation of both basic and diluted EPS. As a
result, primary and fully diluted EPS have been replaced by basic and diluted
EPS. Prior years' EPS have been restated to conform with the standards
established by SFAS No. 128. (Notes J and Q)

Environmental Cleanup Matters

The Company expenses environmental costs related to existing conditions
resulting from past or current operations and from which no current or future
benefit is discernible. The Company determines its liability on a site by site
basis and records a liability at the time when it is probable and can be
reasonably estimated. The Company's estimated liability is reduced to reflect
the anticipated participation of other potentially responsible parties in those
instances where it is probable that such parties are legally responsible and
financially capable of paying their respective shares of the relevant costs. The
estimated liability of the Company is not discounted or reduced for possible
recoveries from insurance carriers. (Note N)

                                                                            35
<PAGE>   16
- --------------------------------------------------------------------------------
notes to consolidated financial statements (continued)
- --------------------------------------------------------------------------------


Use of Estimates

The preparation of consolidated financial statements in conformity with
generally accepted accounting principles requires management to make certain
estimates and assumptions that affect the reported amount of assets and
liabilities and the disclosure of contingent assets and liabilities at the date
of the consolidated financial statements and the reported amounts of revenues
and expenses during the reported period. Actual results could differ from those
estimates.

Reclassification

Certain amounts in 1997 and 1996 have been reclassified to conform to the 1998
presentation.

Note B Business Developments and Special Items

On December 18, 1997, the Company signed an agreement, effective October 1,
1997, to acquire the remaining 50% interest in its fumed silica joint venture in
Rheinfelden, Germany, for approximately $20.0 million. The acquisition was
accounted for using the purchase method of accounting. Accordingly, the purchase
price was allocated to the net assets acquired based on their estimated fair
values. The excess of purchase price over fair value of net assets acquired,
approximately $11.0 million, was recorded as goodwill and is being amortized
over 15 years.

The Company acquired an 80% ownership interest in P.T. Continental Carbon
Indonesia ("PTCCI"), an Indonesian carbon black plant located in Merak,
Indonesia, during 1996. The recent financial and economic circumstances in
Indonesia have resulted in a significant decline in demand for carbon black in
the region. As a result, management decided to halt production at this plant
during 1998. In accordance with Statement of Financial Accounting Standards No.
121, "Accounting for the Impairment of Long-Lived Assets" ("SFAS No. 121"), the
Company recognized an impairment loss of $60.0 million for the difference
between the carrying value of PTCCI's long-lived assets of $77.0 million and the
estimated fair value. The charge to the Specialty Chemicals and Materials Group
consisted of $34.0 million for property, plant and equipment and other assets
and $26.0 million for goodwill and other intangible assets. The Company will
continue to maintain the facility and assess the demand for carbon black in the
region as a basis for future decisions to restart production.

During 1997, the Company entered into an agreement to process tantalum ore
residues accumulated from the Company's past production of tantalum. The Company
expected the process would produce economic recoveries of tantalum and
capitalized prepaid expenses of approximately $25.0 million associated with the
agreement. However, the tantalum recovery rate was substantially lower than
expected. Therefore, in the third quarter of 1998, management discontinued the
project, resulting in a charge of $25.0 million to operations of the Specialty
Chemicals and Materials Group.

During 1997, earnings were reduced by the recognition of special charges
totaling $18.2 million for asset impairments of $10.3 million and employee
severance costs of $7.9 million in the Specialty Chemicals and Materials Group.

During 1996, the Company sold its coal transportation business, TUCO, for $85.0
million and recorded a gain of $38.9 million related to the sale. Cash proceeds
of $35.0 million from the sale were received on October 4, 1996.

During 1996, the Company recognized gains of $2.5 million on the settlement of a
contractual matter and $3.3 million from a reduction in its ownership position
in the Trinidad natural gas liquefaction project.

On November 14, 1995, the Company modified its existing joint venture agreement
for its carbon black venture in Shanghai, China. This amendment provided for the
expansion of the facility and the increase of the Company's ownership interest
to 70%, which is to take effect as the expansion is funded. As a result, the
Company will account for this venture on a consolidated basis as of October 1,
1998.

Note C Inventories

Inventories were as follows:
                                                    -----------------------
September 30                                           1998         1997
===========================================================================
Dollars in millions

Raw materials                                        $ 68.2       $ 81.1
Work in process                                        62.9         59.8
Finished goods                                         76.1         64.1
Other                                                  43.9         41.9
- ---------------------------------------------------------------------------
 Total                                               $251.1       $246.9
===========================================================================


  36


<PAGE>   17

- --------------------------------------------------------------------------------
                        notes to consolidated financial statements (continued)
- --------------------------------------------------------------------------------


     Inventories valued under the LIFO method comprised approximately 32% and
35% of 1998 and 1997 total inventory, respectively. At September 30, 1998 and
1997, the estimated current cost of these inventories exceeded their stated
valuation determined on the LIFO basis by approximately $32.0 million and $31.0
million, respectively.

Note D  Investments

At September 30, 1998 and 1997, investments in common stock accounted for under
the equity method, amounted to $91.1 million and $86.1 million, respectively.
Dividends received from equity affiliates were $7.5 million in 1998, $10.4
million in 1997 and $12.9 million in 1996.

     The combined results of operations and financial position of the Company's
equity-basis affiliates are summarized below:

                                                     -----------------------
September 30                                            1998         1997
============================================================================
Dollars in millions

Condensed Income Statement Information:
Net sales                                             $617.5       $632.1
Gross profit                                           237.5        234.7
Net income                                              26.1         40.7

Condensed Balance Sheet Information:
Current assets                                        $280.5       $296.6
Non-current assets                                     419.1        419.5
Current liabilities                                    221.9        260.1
Non-current liabilities                                306.6        287.3
Net assets                                             171.1        168.7
============================================================================


     Other investments include available-for-sale equity securities. The fair
market value of available-for-sale equity securities was $53.9 million and
$136.8 million as of September 30, 1998 and 1997, respectively. Gains related to
sales of available-for-sale securities were $90.3 million and $28.3 million in
1998 and 1996, respectively. Sales of available-for-sale securities were not
significant for the year ended September 30, 1997.

Note E  Property, Plant & Equipment

Property, plant and equipment is summarized as follows:

                                                    -----------------------
September 30                                            1998         1997
===========================================================================
Dollars in millions

Land and improvements                                 $ 73.6       $ 50.2
Buildings                                              290.6        294.2
Machinery and equipment                              1,277.2      1,218.0
Other                                                   74.7         55.2
Construction in progress                               198.2        142.2
- ----------------------------------------------------------------------------
Total property, plant and equipment                 $1,914.3     $1,759.8
Less: accumulated depreciation                         936.3        837.5
- ----------------------------------------------------------------------------
Net property, plant and equipment                    $ 978.0      $ 922.3
============================================================================


     Depreciation expense was $110.1 million, $104.9 million and $92.2 million
for the years ended September 30, 1998, 1997 and 1996, respectively.



Note F  Accounts Payable & Accrued Liabilities

Accounts payable and accrued liabilities consisted of the following:

                                                     -----------------------
September 30                                            1998         1997
- ----------------------------------------------------------------------------
Dollars in millions

Accounts payable                                      $147.8       $116.6
Accrued employee compensation                           22.4         21.2
Other accrued liabilities                               98.0         86.1
- ----------------------------------------------------------------------------
  Total                                               $268.2       $223.9
============================================================================


Note G  Debt

Unsecured long-term debt consisted of the following:

                                                   -----------------------------
September 30                                            1998         1997
- --------------------------------------------------------------------------------
Dollars in millions

Fixed Rate Notes (stated rate):
  Notes due 1997, 10.25%                            $     --      $ 100.0
  Notes due 2002-2022, 8.07%                           105.0        105.0
  Notes due 2004-2011, 7.17%                            90.0         90.0
  Note due 2027, 7.28%                                  25.0           --
  Note due 2027, put option 2004, 6.57%                 25.0           --
  Guarantee of ESOP notes, due 2013, 8.29%              60.6         62.5
  Foreign term loan, due 2000, 8.7%                      6.7         10.1
  Other, due beginning in 1999 with various
   rates from 3.0% to 18.5%                              7.1         12.7
Variable Rate Notes (end of year rate):
  Foreign term loan, due 2001, floating
   rate 5.4%                                             8.3         10.8
  Overseas Private Investment Corporation
   term loan, due 2002, floating rate 7.5%                --          9.4
- --------------------------------------------------------------------------------
                                                      $327.7      $ 400.5

Less: current portion of long-term debt                (11.4)      (115.0)
- --------------------------------------------------------------------------------
  Total                                               $316.3      $ 285.5
- --------------------------------------------------------------------------------


                                                                            37


<PAGE>   18
- --------------------------------------------------------------------------------
  notes to consolidated financial statements (continued)
- --------------------------------------------------------------------------------

     In June 1992, the Company filed a $300.0 million shelf registration
statement with the Securities and Exchange Commission. Subsequently, $105.0
million of notes payable were refinanced with notes of a weighted average
maturity of 19 years and a weighted average interest rate of 8.07%. The notes
were issued at par and provide for principal to be repaid at maturity.

     In February 1997, the Company issued $90.0 million of medium term notes.
The notes have a weighted average maturity of 11 years and a weighted average
interest rate of 7.17%. 

     In October 1997, the Company issued a total of $50.0 million in medium term
notes. These notes included a $25.0 million note, with an interest rate of 7.28%
due in 2027, and a $25.0 million note, with an interest rate of 6.57% due in
2027 and a put option in 2004.

     On September 29, 1998, the Company filed a $500.0 million shelf
registration statement with the Securities and Exchange Commission which was
effective as of October 13, 1998. This registration includes the remaining $55.0
million not yet issued under the 1992 registration. As of September 30, 1998, no
notes have been issued under the new registration.

     During fiscal 1989, the Company's Employee Stock Ownership Plan ("ESOP")
borrowed $75.0 million from an institutional lender in order to finance its
purchase of 75,000 shares of the Company's Series B ESOP Convertible Preferred
Stock. This debt bears interest at 8.29% per annum, and is to be repaid in equal
quarterly installments through December 31, 2013. The Company, as guarantor, has
reflected the outstanding balance of $60.6 million and $62.5 million as a
liability on the Company's consolidated balance sheet at September 30, 1998 and
1997, respectively. An equal amount, representing deferred employee benefits,
has been recorded as a reduction of stockholders' equity.

     The Company may borrow up to $300.0 million at floating rates under the
terms of a revolving credit and term loan facility. The agreement contains
specific covenants, including certain maximum indebtedness limitations and
minimum cash flow requirements, that would limit the amount available for future
borrowings. Commitment fees are paid based on the used and unused portions of
the facility. The facility is available through January 3, 2002. No amounts were
outstanding under this credit agreement at September 30, 1998 or 1997.

     The aggregate principal amounts of long-term debt due in each of the five
fiscal years 1999 through 2003 and thereafter are $11.4 million, $10.3 million,
$4.1 million, $25.8 million, $3.0 million and $273.1 million, respectively.

     At September 30, 1998 and 1997, the fair value of long-term borrowings was
approximately $333.5 million and $313.0 million, respectively.

     The weighted average interest rate on short-term borrowing was
approximately 6% and 7% as of September 30, 1998 and 1997, respectively.

Note H Pension Plans & Postretirement Benefits

Pension Plans

The Company has trusteed, non-contributory pension plans covering most employees
in the United States and various foreign plans covering employees of certain
non-U.S. subsidiaries. Benefits provided under the Company's defined benefit
pension plans are primarily based on years of service and the employee's
compensation. The Company's funding policy is to contribute annually amounts
based upon actuarial and economic assumptions designed to achieve adequate
funding of projected benefit obligations.

     Pension benefits accrue under several benefit plans, including the
following two plans: the Cash Balance Plan ("CBP"), a defined benefit pension
plan, and the Employee Stock Ownership Plan ("ESOP"). In November 1988, the ESOP
was funded with the Company's newly issued Series B ESOP Convertible Preferred
Stock, which was acquired with $75.0 million borrowed by the ESOP.

     At September 30, 1998 and 1997, the projected benefit obligations included
accumulated benefit obligations of $204.1 million and $175.6 million,
respectively, of which $197.2 million and $167.7 million were vested in 1998 and
1997, respectively.

     Net periodic pension cost was comprised of the following elements:

                                     -------------------------------------------
Years ended September 30                   1998         1997         1996
================================================================================
Dollars in millions

Service cost                           $    7.9       $  7.7       $  7.8
Interest cost                              11.2         14.0         13.4
Actual return on plan assets              (20.7)       (28.3)       (18.8)
Net amortization                            5.5         10.3          2.9
- --------------------------------------------------------------------------------
  Net periodic pension cost            $    3.9       $  3.7       $  5.3
================================================================================

  38
<PAGE>   19


- --------------------------------------------------------------------------------
                        notes to consolidated financial statements (continued)
- --------------------------------------------------------------------------------


     The following table sets forth the funded status of pension plans:

                                                    ------------------------
September 30                                            1998         1997
============================================================================
Dollars in millions

Actuarial present value of projected
  benefit obligation                                  $220.2       $195.0
Plan assets at fair value (primarily
  fixed-income and equity securities)                  237.8        222.4
- ----------------------------------------------------------------------------
Excess of plan assets over projected
  benefit obligation                                    17.6         27.4
Unrecognized net gain                                  (33.9)       (48.9)
Unrecognized prior service cost being
  amortized over 6-12 years                              1.3          6.1
Unrecognized net transition asset being
  amortized over 6 years                                (3.5)        (4.9)
- ----------------------------------------------------------------------------
  Net deferred pension credit (included
    in other liabilities)                           $  (18.5)    $  (20.3)
============================================================================


 The following weighted average rates were used in the calculations:

                                                    ------------------------

Years ended September 30                                 1998         1997
============================================================================
Discount rate                                            6.3%         7.4%
Expected rate of return on plan assets                   8.1%         8.9%
Assumed rate of increase in compensation                 4.6%         5.0%
============================================================================


Postretirement Benefits

The Company has defined benefit postretirement plans that provide certain health
care and life insurance benefits for retired employees. Substantially all U.S.
employees become eligible for these benefits if they have met certain age and
service requirements at retirement. The Company funds the plans as claims or
insurance premiums are incurred.

     Net periodic postretirement benefit cost was comprised of the following
elements:

                                      --------------------------------------
Years ended September 30                   1998         1997         1996
============================================================================
Dollars in millions

Service cost                               $0.8         $0.9         $0.8
Interest cost                               5.6          5.6          5.3
Net amortization                            0.2          0.2          0.2
- ----------------------------------------------------------------------------
Net periodic postretirement
  benefit cost                             $6.6         $6.7         $6.3
============================================================================


     The following table sets forth the funded status of the postretirement
benefit plans:

                                              ------------------------------
Years ended September 30                                1998         1997
============================================================================
Dollars in millions

Accumulated postretirement benefit
  obligations:
    Retirees                                        $   66.3       $ 61.9
    Fully eligible active plan participants              8.0          6.3
    Other active plan participants                      15.9         12.1
- ----------------------------------------------------------------------------
                                                        90.2         80.3
Plan assets at fair value                                --            --
Excess of accumulated postretirement
  benefit obligations over plan assets                 (90.2)       (80.3)
Unrecognized net loss                                   20.0         10.8
Unrecognized prior service cost                         (1.4)        (1.1)
- ----------------------------------------------------------------------------
  Accrued postretirement benefit cost                 $(71.6)      $(70.6)
============================================================================


     Health care cost trend rate assumptions have a significant effect on the
amounts reported. For example, increasing the assumed health care cost trend
rates by one percentage point for each future year would increase the
accumulated postretirement benefit obligation by approximately $8.4 million as
of September 30, 1998 and 1997, and the aggregate of the service and interest
cost components of net periodic postretirement benefit cost for the years then
ended by approximately $0.8 million.

     The following weighted average rates were used in the calculations:


                                                   -------------------------
Years ended September 30                                 1998         1997
============================================================================
Discount rate                                            6.3%         7.3%
Assumed rate of increase in compensation                 5.3%         5.3%
Assumed annual rate of increase in health
  care benefits                                          5.5%         5.5%
============================================================================



                                                                            39


<PAGE>   20


- --------------------------------------------------------------------------------
notes to consolidated financial statements (continued)
- --------------------------------------------------------------------------------



Note I Stockholders' Equity

The following table summarizes the changes in stockholders' equity.

<TABLE>
<CAPTION>

                                                                                  -------------------------------------------
Years ended September 30                                                                  1998           1997          1996
=============================================================================================================================
Dollars in millions (except per share amounts)
<S>                                                                                 <C>            <C>            <C>       
Preferred Stock
  Beginning of year                                                                 $     75.3     $     75.3     $     75.3
- -----------------------------------------------------------------------------------------------------------------------------
    End of year                                                                     $     75.3     $     75.3     $     75.3
=============================================================================================================================
Preferred Treasury Stock
  Beginning of year                                                                 $     (9.4)    $     (6.6)    $     (4.9)
  Purchase of treasury stock                                                              (4.2)          (2.8)          (1.7)
- -----------------------------------------------------------------------------------------------------------------------------
    End of year                                                                     $    (13.6)    $     (9.4)    $     (6.6)
=============================================================================================================================
Common Stock
  Beginning of year                                                                 $    135.5     $    135.5     $     67.8
  Retirement of treasury stock                                                           (68.3)            --             --
  Two-for-one stock split                                                                   --             --           67.7
- -----------------------------------------------------------------------------------------------------------------------------
    End of year                                                                     $     67.2     $    135.5     $    135.5
=============================================================================================================================
Additional Paid-In Capital
  Beginning of year                                                                 $     39.3     $     23.6     $     17.8
  Sale of common treasury stock to the Company's savings plans                             2.7            2.2            2.4
  Issuance of common treasury stock under employee compensation plans,
    including tax benefit of $4.7, $3.6 and $9.4                                          26.8           13.5           21.8
  Retirement of common treasury stock                                                    (63.9)            --             --
  Two-for-one stock split                                                                   --             --          (18.4)
- -----------------------------------------------------------------------------------------------------------------------------
    End of year                                                                     $      4.9     $     39.3     $     23.6
=============================================================================================================================
Retained Earnings
  Beginning of year                                                                 $  1,238.2     $  1,176.7     $  1,062.5
  Net income                                                                             121.6           92.8          194.1
  Common dividends paid ($0.42, $0.40 and $0.36 per share), net of tax benefit
    of $0.2, $0.2 and $0.6                                                               (28.5)         (28.0)         (25.3)
  Preferred dividends paid to ESOP, net of tax benefit                                    (3.2)          (3.3)          (3.3)
  Retirement of common treasury stock                                                   (656.4)            --             --
  Redemption of preferred stock purchase rights                                             --             --           (1.9)
  Two-for-one stock split                                                                   --             --          (49.4)
- -----------------------------------------------------------------------------------------------------------------------------
    End of year                                                                     $    671.7     $  1,238.2     $  1,176.7
=============================================================================================================================
Common Treasury Stock
  Beginning of year                                                                 $   (705.4)    $   (634.4)    $   (528.8)
  Purchase of treasury stock                                                            (101.0)         (84.7)        (122.4)
  Sale of treasury stock to the Company's savings plans                                    1.7            1.5            1.4
  Issuance of treasury stock under employee compensation plans                            16.1           12.2           15.4
  Retirement of treasury stock                                                           788.6             --             --
- -----------------------------------------------------------------------------------------------------------------------------
    End of year                                                                     $      0.0     $   (705.4)    $   (634.4)
=============================================================================================================================
Unearned Compensation
  Beginning of year                                                                 $    (18.3)    $    (16.6)    $    (10.8)
  Issuance of treasury stock under employee compensation plans                           (18.0)         (10.9)         (11.9)
  Amortization                                                                            10.1            9.2            6.1
- -----------------------------------------------------------------------------------------------------------------------------
    End of year                                                                     $    (26.2)    $    (18.3)    $    (16.6)
=============================================================================================================================
Deferred Employee Benefits
  Beginning of year                                                                 $    (62.5)    $    (64.3)    $    (65.9)
  Principal payment by ESOP under guaranteed loan                                          1.9            1.8            1.6
- -----------------------------------------------------------------------------------------------------------------------------
    End of year                                                                     $    (60.6)    $    (62.5)    $    (64.3)
=============================================================================================================================
Unrealized Gain on Marketable Equity Securities
  Beginning of year                                                                 $     53.9     $     29.9     $     32.0
  Net change in unrealized gain                                                          (37.2)          24.0           (2.1)
- -----------------------------------------------------------------------------------------------------------------------------
    End of year                                                                     $     16.7     $     53.9     $     29.9
=============================================================================================================================
Foreign Currency Translation Adjustments
  Beginning of year                                                                 $    (18.8)    $     25.8     $     39.9
  Foreign currency translation adjustments, including tax charge (benefit) of
    $0.0, $0.1 and $(4.3)                                                                (11.1)         (44.6)         (14.1)
- -----------------------------------------------------------------------------------------------------------------------------
    End of year                                                                     $    (29.9)    $    (18.8)    $     25.8
=============================================================================================================================
Total stockholders' equity, end of year                                             $    705.5     $    727.8     $    744.9
=============================================================================================================================
</TABLE>


  40


<PAGE>   21
- --------------------------------------------------------------------------------
                        notes to consolidated financial statements (continued)
- --------------------------------------------------------------------------------


Shares of Stock
                                        ----------------------------------------
September 30                               1998         1997         1996
================================================================================
Preferred shares in thousands
Common shares in millions

PREFERRED STOCK
Beginning of year                          75.3         75.3         75.3
- --------------------------------------------------------------------------------
  End of year                              75.3         75.3         75.3
- --------------------------------------------------------------------------------
PREFERRED TREASURY STOCK
Beginning of year                           7.0          5.7          5.0
Purchased                                   1.5          1.3          0.7
- --------------------------------------------------------------------------------
  End of year                               8.5          7.0          5.7
- --------------------------------------------------------------------------------
COMMON STOCK
Beginning of year                         135.5        135.5         67.8
Retirement of treasury stock              (68.3)          --           --
Two-for-one stock split                      --           --         67.7
- --------------------------------------------------------------------------------
  End of year                              67.2        135.5        135.5
- --------------------------------------------------------------------------------
COMMON TREASURY STOCK
Beginning of year                          66.1         64.0         30.4
Purchased                                   3.8          3.5          3.0
Issued                                     (1.6)        (1.4)        (1.5)
Retirement of treasury stock              (68.3)          --           --
Two-for-one stock split                      --           --         32.1
- --------------------------------------------------------------------------------
  End of year                               0.0         66.1         64.0
================================================================================


     On September 11, 1998, the Board of Directors adopted a resolution to
retire the entire balance of shares of common stock held in the Corporate
Treasury and all subsequent acquisitions/purchases effective September 30,
1998. For the year ended September 30, 1998, a total of 68.3 million shares of
the Company's common stock had been retired.

     In November 1995, the Company declared a dividend of one Preferred Stock
Purchase Right ("Right") for each outstanding share of the Company's common
stock. The Rights are not presently exercisable. Each Right entitles the holder,
upon the occurrence of certain specified events, to purchase from the Company
one one-hundredth of a share of Series A Junior Participating Preferred Stock at
a purchase price of $200 per share. The Rights further provide that each Right
will entitle the holder, upon the occurrence of certain other specified events,
to purchase from the Company its common stock having a value of twice the
exercise price of the Right and, upon the occurrence of certain other specified
events, to purchase from another person into which the Company was merged or
which acquired 50% or more of the Company's assets or earnings power, common
stock of such other person having a value of twice the exercise price of the
Right. The Rights may be generally redeemed by the Company at a price of $0.01
per Right. The Rights expire on November 10, 2005.

     During fiscal 1989, the Company placed 75,336 shares of its Series B ESOP
Convertible Preferred Stock with the Company's Employee Stock Ownership Plan
("ESOP") for cash at a price of $1,000 per share. Each share of the Series B
ESOP Convertible Preferred Stock is convertible into 87.5 shares of the
Company's common stock subject to certain events and anti-dilution adjustment
provisions, and carries voting rights on an "as converted" basis. The trustee
for the ESOP has the right to cause the Company to redeem shares sufficient to
provide for periodic distributions to plan participants. Such shares shall be
redeemed at their fair market value, and may be redeemed by the Company, for
cash, shares of the Company's common stock, or a combination thereof at the
Company's option. Each share is redeemable at the option of the Company at a
price of $1,008. The redemption price declines annually until it becomes $1,000
per share on and after November 19, 1998, plus accrued but unpaid dividends to
the redemption date.

     The issued shares of Series B ESOP Convertible Preferred Stock are entitled
to receive preferential and cumulative quarterly dividends, and rank as to
dividends and liquidation prior to the Company's Series A Junior Participating
Preferred Stock and common stock. At September 30, 1998, 5.85 million shares of
the Company's common stock were reserved for conversion of the Series B ESOP
Convertible Preferred Stock.

     In September 1998, the Board of Directors authorized the Company to
purchase up to 4.0 million shares of the Company's common stock, superseding the
previous authorization issued in May, 1997. As of September 30, 1998, the
Company had purchased approximately 0.7 million shares under the new
authorization.

     On November 10, 1995, a two-for-one stock split in the form of a stock
dividend was authorized, payable to stockholders of record on March 15, 1996. A
total of 67.8 million shares were issued in connection with the split. Also,
reclassified to common stock was $18.4 million from additional paid-in capital
and $49.3 million from retained earnings. All common share and per share amounts
in these financial statements have been restated to reflect the split where
appropriate.


                                                                            41


<PAGE>   22


- -------------------------------------------------------------------------------
notes to consolidated financial statements (continued)
- -------------------------------------------------------------------------------


Note J Earnings per Share

Basic and diluted earnings per share ("EPS") were calculated as follows:

                                     -------------------------------------------
Years ended September 30                 1998         1997         1996
================================================================================
Dollars in millions
(except per share amounts)

Basic EPS:
  Income available to common
    shares (numerator)                $ 118.4       $  89.5      $ 190.8
  Weighted-average common
    shares outstanding                   68.1          69.9         72.0
  Less: Contingently issuable
    shares                               (2.5)         (2.4)        (2.4)
- ------------------------------------------------------------------------
  Adjusted weighted-average
    shares (denominator)                 65.6          67.5         69.6
========================================================================
  Basic EPS                           $  1.80       $  1.33      $  2.74
========================================================================

Diluted EPS:
  Income available to common
    shares                            $ 118.4       $  89.5      $ 190.8
  Dividends on preferred stock            3.2           3.3          3.3
  Less: Income impact of
    assumed conversion of
    preferred stock                      (1.7)         (1.8)        (2.1)
- ------------------------------------------------------------------------
  Income available to common
    shares plus assumed
    conversions (numerator)           $ 119.9       $  91.0      $ 192.0

  Weighted-average common
    shares outstanding                   68.1          69.9         72.0
  Effect of dilutive securities:
    Stock-based compensation              6.5           6.8          7.3
- ------------------------------------------------------------------------
  Adjusted weighted-average
    shares (denominator)                 74.6          76.7         79.3
========================================================================
  Diluted EPS                         $  1.61       $  1.19      $  2.42
========================================================================


Note K Savings Plan & Incentive Compensation Plans

The Plans

The Company sponsors a profit sharing and savings plan called the Cabot
Retirement Incentive Savings Plan ("CRISP"). Under the plan, the Company will
make matching contributions of at least 75% of a participant's contribution of
up to 7.5% of the participant's eligible compensation, subject to limitations
required by governmental laws or regulations. Company contributions to the CRISP
for 1998, 1997 and 1996 were $4.4 million, $4.0 million and $3.5 million,
respectively.

     The Company has an Equity Incentive Plan for key employees. Under the plan
adopted in 1988, participants may be granted various types of stock and
stock-based awards. During 1988 through 1991, the awards granted consisted of
stock options, performance appreciation rights ("PARs"), and tandem units that
may be exercised as stock options or PARs. These awards were granted at the fair
market value of the Company's common stock at date of grant, vested ratably on
each of the next four anniversaries of the award, and generally expire ten years
from the date of grant. In 1992 through 1995, awards consisted of common stock
of the Company, which employees could elect to receive in the form of restricted
stock purchased at a price equal to 50% of the fair market value on the date of
the award, nonqualified stock options at fair market value of the Company's
common stock on the date of the award, or a combination of one-half of each.
Effective in March of 1996, no new awards were permitted under this plan.

     In December 1995, the Board of Directors adopted the 1996 Equity Incentive
Plan. The 1996 plan was approved by the stockholders of the Company in March
1996. Awards under the 1996 plan consist of Restricted Stock, which could be
purchased at a price equal to 40% of the fair market value on the date of the
award or nonqualified stock options at the fair market value of the Company's
common stock on the date of the award. Variations of these awards were made to
international employees in order to try to provide results comparable to U.S.
employees. The awards generally vest on the third anniversary date of the award
for employees then employed by the Company and the options generally expire five
years from the date of grant.

     The Company has reserved 2.8 million shares of common stock for issuance
under the 1996 plan. There were approximately 1.3 million shares available for
future grants at September 30, 1998. Compensation expense recognized during
1998, 1997 and 1996 for restricted stock grants was $10.1 million, $9.2 million
and $6.1 million, respectively.

     The following table summarizes the plan's restricted stock activity for the
last three fiscal years:

                                              ------------------------------
                                                                  Weighted
                                                                   Average
                                                Restricted        Exercise
                                                     Stock           Price
============================================================================
Shares in thousands

Outstanding at September 30, 1995                    2,078          $11.15
  Granted                                              829           10.68
  Vested                                              (571)          11.39
  Canceled                                             (49)          10.92
- -----------------------------------------------------------           

Outstanding at September 30, 1996                    2,287           10.93
  Granted                                              865           14.33
  Vested                                              (696)          10.84
  Canceled                                            (203)          10.57
- -----------------------------------------------------------

Outstanding at September 30, 1997                    2,253           11.87
  Granted                                            1,026           21.47
  Vested                                              (670)          10.15
  Canceled                                            (108)          11.96
- -----------------------------------------------------------

Outstanding at September 30, 1998                    2,501          $16.27
============================================================================



  42


<PAGE>   23
- --------------------------------------------------------------------------------
                        notes to consolidated financial statements (continued)
- --------------------------------------------------------------------------------

Stock-Based Compensation

Had the fair value based method been adopted, the Company's proforma net income
and proforma net income per common share for fiscal 1998, 1997 and 1996 would
have been as follows:


                                        ------------------------------------
Years ended September 30                   1998         1997         1996
============================================================================

Net income-proforma
  (in millions)                          $121.4        $92.7       $194.0
Net income per common
  share-proforma:
  Basic                                  $ 1.80        $1.32       $ 2.74
  Diluted                                $ 1.60        $1.18       $ 2.42
============================================================================


     The estimated weighted average fair value of the options granted during
fiscal 1998, 1997 and 1996 were $11.00, $6.37 and $6.82, respectively on the
date of grant using the Black-Scholes option-pricing model and the following
weighted average assumptions:

                                      --------------------------------------
Years ended September 30                  1998         1997         1996
============================================================================

Expected stock price volatility            34%          26%          24%
Risk free interest rate                  5.63%        6.54%        6.53%
Expected life of options               4 years      4 years      4 years
Expected annual dividends               $ 0.44       $ 0.40       $ 0.40
============================================================================


     The effects of applying the fair value based method in this proforma
disclosure are not indicative of future amounts. The fair value based method
does not apply to awards prior to 1995 and additional awards in future years are
anticipated.

     The following table summarizes the plans' stock option activity from
September 30, 1995 through September 30, 1998:

                                              ------------------------------
                                                                  Weighted
                                                                   Average
                                                     Stock        Exercise
                                                   Options           Price
============================================================================
Options in thousands

Outstanding at September 30, 1995                    2,350         $  9.12
  Granted                                               60           26.70
  Exercised                                           (681)           8.78
  Canceled                                             (29)          10.53
- --------------------------------------------------------------

Outstanding at September 30, 1996                    1,700            9.77
  Granted                                               91           23.88
  Exercised                                           (300)           8.99
  Canceled                                             (34)          15.79
- --------------------------------------------------------------

Outstanding at September 30, 1997                    1,457           10.67
  Granted                                              281           35.31
  Exercised                                           (393)           9.21
  Canceled                                             (23)          18.98
- --------------------------------------------------------------

Outstanding at September 30, 1998                    1,322          $16.26
============================================================================


     Of the 1.3 million stock options outstanding as of September 30, 1998, 0.9
million were exercisable at a weighted average exercise price of $9.05. 

     Options outstanding at September 30, 1998:

- -------------------------------------------------------------------------
                                          Weighted Average
- -------------------------------------------------------------------------
                       Thousands                              Remaining
      Range of        of Options          Exercise          Contractual
Exercise Price       Outstanding             Price           Life Years
=========================================================================
  $ 7.59- 7.94               683              $  7.77              2.66
    8.00- 8.72                23                 8.35              1.41
   10.47-12.28               139                10.79              1.89
   20.00-23.88               148                22.32              3.20
   26.70-35.31               329                34.01              4.70
=========================================================================


Note L Income Taxes

Income before income taxes was as follows:

                                        ------------------------------------
Years ended September 30                 1998         1997         1996
============================================================================
Dollars in millions

Domestic                                 $ 46.1       $ 30.2       $134.3
Foreign                                   121.9         86.9        145.5
- ----------------------------------------------------------------------------
  Total                                  $168.0       $117.1       $279.8
============================================================================



     Taxes on income consisted of the following:


                                        ------------------------------------
Years ended September 30                 1998         1997         1996
============================================================================
Dollars in millions

U.S. federal and state:
  Current                               $  (1.4)       $ 8.6        $33.3
  Deferred                                  6.4         (9.4)         1.0
- ----------------------------------------------------------------------------
    Total                                 $ 5.0      $  (0.8)       $34.3
============================================================================


Foreign:
  Current                                 $49.9        $46.7        $61.2
  Deferred                                  5.6         (3.8)         2.7
- ----------------------------------------------------------------------------
    Total                                 $55.5        $42.9        $63.9
============================================================================
       Total U.S. and Foreign             $60.5        $42.1        $98.2
============================================================================



                                                                            43


<PAGE>   24


- --------------------------------------------------------------------------------
notes to consolidated financial statements (continued)
- --------------------------------------------------------------------------------


     The provision for income taxes at the Company's effective tax rate differed
from the provision for income taxes at the statutory rate as follows:

                                        ------------------------------------
Years ended September 30                   1998         1997         1996
============================================================================
Dollars in millions

Computed tax expense at the
  Federal statutory rate                  $58.8        $41.0        $97.9
Foreign income:
  Impact of taxation at different
    rates, repatriation and other           2.6          0.9          5.8
  Impact of foreign losses for
    which a current tax benefit
    is not available                        4.1          4.2          2.5
State taxes, net of federal effect          1.3          1.0          2.7
Foreign sales corporation                  (1.6)        (1.2)        (3.0)
U.S. and state benefits from
  research and experimentation
  activities                               (4.3)        (1.3)        (6.0)
Other, net                                 (0.4)        (2.5)        (1.7)
- ----------------------------------------------------------------------------
  Provision for income taxes              $60.5        $42.1        $98.2
============================================================================

     Significant components of deferred income taxes were as follows:

                                                    ------------------------
Years ended September 30                                1998         1997
============================================================================
Dollars in millions

Deferred tax assets:
Depreciation and amortization                         $ 30.3       $ 26.0
Pension and other benefits                              56.5         54.1
Environmental matters                                   12.6         12.6
Special charges                                          5.4          7.1
Investments                                             10.9         10.8
State and local taxes                                    4.0          4.7
Net operating loss and other tax carryforwards          12.1         17.3
Other                                                   31.5         26.4
- ----------------------------------------------------------------------------
  Subtotal                                             163.3        159.0
- ----------------------------------------------------------------------------
Valuation allowances                                   (10.7)       (16.1)
- ----------------------------------------------------------------------------
  Total deferred tax assets                           $152.6       $142.9
============================================================================

Deferred tax liabilities:
Depreciation and amortization                         $ 79.1       $ 65.7
Pension and other benefits                              13.8         13.0
Investments                                             11.6         42.8
Other                                                  111.8        102.2
- ----------------------------------------------------------------------------
  Total deferred tax liabilities                      $216.3       $223.7
============================================================================



     The valuation allowance at September 30, 1998 and 1997 represents
management's best estimate of the ultimate realization of the net deferred tax
amounts. The deferred tax valuation allowance decreased in 1998 by $5.4 million
due primarily to decreases in the U.S. dollar value of certain foreign net
operating loss carryforwards reflected as deferred tax assets.

     Approximately $39.7 million of net operating losses and other tax
carryforwards remain at September 30, 1998, $26.4 million of which expire in the
years 1999 through 2005, and $13.3 million of which can be carried forward
indefinitely. The benefits of these carryforwards are dependent on taxable
income during the carryforward period in those foreign jurisdictions wherein
they arose, and accordingly, a valuation allowance has been provided where
management has determined that it is more likely than not that the carryforwards
will not be utilized.

     United States income tax returns for fiscal years 1994, 1995 and 1996 are
currently under examination by the Internal Revenue Service. Assessments, if
any, are not expected to have a material adverse effect on the financial
statements.

     Provisions have not been made for U.S. income taxes or foreign withholding
taxes on approximately $130.0 million of undistributed earnings of foreign
subsidiaries, as these earnings are considered indefinitely reinvested. These
earnings could become subject to U.S. income taxes and foreign withholding taxes
(subject to a reduction for foreign tax credits) if they were remitted as
dividends, were loaned to the Company or a U.S. subsidiary, or if the Company
should sell its stock in the subsidiaries. However, the Company believes that
U.S. foreign tax credits would largely eliminate any U.S. income tax and offset
any foreign withholding tax that might otherwise be due.

Note M Supplemental Cash Flow Information

Cash paid in 1998, 1997 and 1996 for income taxes and interest was as follows:

                                        ------------------------------------
Dollars in millions                        1998         1997         1996
============================================================================

Income taxes                              $40.5        $65.5       $109.1
Interest                                  $40.0        $38.8       $ 39.1
============================================================================


Note N Commitments & Contingencies

Lease Commitments

The Company leases certain transportation vehicles, warehouse facilities, office
space, machinery and equipment under cancelable and non-cancelable leases, most
of which expire within ten years and may be renewed by the Company. Rent expense
under such arrangements for 1998, 1997 and 1996, totaled $15.4 million, $14.8
million and $14.5 million, respectively. Future minimum rental commitments under
non-cancelable leases are as follows:

Dollars in millions
==========================================================================
1999                                                                $13.1
2000                                                                 11.8
2001                                                                  6.4
2002                                                                  2.4
2003                                                                  2.1
2004 and thereafter                                                   9.2
- --------------------------------------------------------------------------
                                                                    $45.0
==========================================================================



  44


<PAGE>   25
- --------------------------------------------------------------------------------
                        notes to consolidated financial statements (continued)
- --------------------------------------------------------------------------------

Other Long-Term Commitments

The Company has entered into long-term purchase agreements for various key raw
materials. The purchase commitments covered by these agreements aggregate
approximately $135.0 million for the periods 1999 to 2003.

     The Company has also entered into purchase agreements for liquefied natural
gas that expire in 2003. The purchase commitments covered by this agreement have
a firm take provision of nine cargoes per winter season at current prices
subject to the supplier's shipping capacity.

     During 1995, the Company entered into long-term supply agreements of more
than six years with certain North American tire customers. The contracts are
designed to provide such customers with agreed-upon amounts of carbon black at
prices based on an agreed-upon formula.

     Also during 1995, the Company agreed to participate as a 10% owner in a
liquefaction plant in Trinidad, and to purchase approximately 60% of the natural
gas produced by the plant. At September 30, 1998, the Company's investment in
this project was approximately $17.6 million and is included in other
investments. Liquefied natural gas from the project is not expected to be
available until the second half of fiscal year 1999.

Contingencies

The Company is a defendant, or potentially responsible party, in various
lawsuits and environmental proceedings wherein substantial amounts are claimed
or at issue.

     During 1998, a charge to environmental expenses was made for costs incurred
for remediation of environmental issues related to a business divested in 1989.
As of September 30, 1998, the Company has approximately $35.6 million reserved
for environmental matters primarily related to divested businesses. The amount
represents the Company's current best estimate of its share of costs likely to
be incurred at those sites where costs are reasonably estimable based on its
analysis of the extent of cleanup required, alternative cleanup methods
available, abilities of other responsible parties to contribute, and its
interpretation of applicable laws and regulations applicable to each site. The
Company reviews the adequacy of this reserve as circumstances change at
individual sites. The Company is unable to estimate the amount of reasonably
possible loss in excess of the accrued amount. Included in other charges for
1998 and 1996 are environmental expenses of $3.5 million and $3.0 million,
respectively. There were no charges for 1997.

     In July 1998, the Environmental Protection Agency ("EPA") informed Cabot
that it will be undertaking corrective action under the Resource Conservation
and Recovery Act at Cabot's facility in Boyertown, Pennsylvania. A site visit by
the Army Corps of Engineers to initiate this action occurred in late September,
1998. It is unclear at this time what corrective action, if any, will be
required at the site and what costs Cabot will incur as a result.

     In the opinion of the Company, although final settlement of these suits and
claims may impact the Company's financial statements in a particular period,
they will not, in the aggregate, have a material adverse effect on the Company's
financial position.

     The Company is contingently liable under a limited guarantee of its
proportionate share for the project financing of the liquefaction plant in
Trinidad. The Company's guarantee will expire when the plant begins commercial
production, which is expected to occur in the second half of fiscal year 1999.
At September 30, 1998, approximately $457.8 million was outstanding under the
joint venture's debt agreement. Cabot's 10% share amounted to $45.8 million.

Note O Risk Management

Cabot Corporation is a global company divided into two distinct segments, the
Specialty Chemicals and Materials Group and Energy Group. Cabot manufactures,
markets, and distributes specialty chemicals and materials through seven
businesses: carbon black, fumed silica, plastics, performance materials
(principally tantalum), microelectronics materials, inkjet colorants and
specialty fluids. These products span several markets including automotive,
electronics, transportation, aerospace, defense, pharmaceuticals, silicone
rubber, packaging, agriculture, construction, inkjet printing and oil and gas
drilling services. In addition, the Company's Energy Group operates a liquefied
natural gas importing, storing and distribution company serving markets which
include gas and electric utilities and independent power producers. In total,
Cabot operates 45 plants in 23 countries.

Market Risk

The Company uses derivative financial instruments primarily to reduce exposure
to fluctuations in interest rates and foreign exchange rates, and to a lesser
extent, to reduce exposure to fluctuations in commodity prices and other market
risks. When entered into, these financial instruments are generally designated
as hedges of underlying exposures associated with specific assets, liabilities
or firm commitments, and are monitored to determine if they remain effective
hedges. The notional amounts of derivatives do not represent actual amounts
exchanged by the parties and thus, are not a measure of the exposure of the
Company through its use of derivatives. The amounts exchanged are calculated by
reference to the notional amounts and by other

                                                                            45
<PAGE>   26
- --------------------------------------------------------------------------------
notes to consolidated financial statements (continued)
- --------------------------------------------------------------------------------

terms of the derivatives, such as interest rates, exchange rates, or other
financial indices.

     The Company is exposed to credit loss in the event of nonperformance by
counterparties to the swap agreements. However, the Company has established
strict counter-party credit guidelines and only enters into transactions with
financial institutions of investment grade or better. The Company considers the
risk of counter-party default to be minimal.

     Because of the correlation between the hedging instrument and the
underlying exposure being hedged, fluctuations in the value of the instruments
are generally offset by changes in the value of the underlying exposures.

Interest Rate

The Company maintains a percentage of fixed and variable rate debt within
defined parameters. The Company uses interest rate swaps to hedge its exposure
on fixed and variable rate debt positions. Variable rates are predominantly
linked to the London Interbank Offered Rate ("LIBOR") as determined at either
three or six month intervals. The interest rate provided by the swap on variable
rate debt is 7.4%.

     At September 30, 1998 and 1997, the notional principal amounts of the
interest rate swap agreements were $150.0 million, expiring in 2004 and 2007.
The notional amount is the amount used for the calculation of interest payments
which are exchanged over the life of the swap transaction and equal to the
amount of principal exchanged at maturity. For 1998, 1997 and 1996, the gains or
losses in interest income or expense associated with these agreements were
immaterial. The fair value of the swaps were $(17.7) million and $(6.3) million
as of September 30, 1998 and 1997, respectively.

Foreign Currency

The Company's international operations are subject to certain opportunities and
risks, including currency fluctuations and government actions. The Company
closely monitors its operations in each country so that it can respond to
changing economic and political environments and to fluctuations in foreign
currencies. Accordingly, the Company utilizes foreign currency option contracts
and forward contracts to hedge its exposure on anticipated transactions and firm
commitments, primarily for receivables and payables denominated in currencies
other than the entities' functional currencies. The Company also monitors its
foreign exchange exposures to ensure the overall effectiveness of its foreign
currency hedge positions. Foreign currency instruments generally have maturities
that do not exceed twelve months.

     The Company has foreign currency instruments, primarily denominated in the
German deutschemark, Japanese yen, British pound sterling, Swedish krona,
Canadian dollar, and Australian dollar. At September 30, 1998 and 1997, the
Company had $20.0 million and $63.4 million in foreign currency instruments
outstanding, respectively. For 1998, 1997 and 1996, the net realized gains or
(losses) associated with these types of instruments were $1.6 million, $4.6
million and $(0.5) million, respectively. The net unrealized gain as of
September 30, 1998 and net unrealized loss as of September 30, 1997, based on
the fair market value of the instruments, were not material to each respective
period.

Commodities

The Company has price risk exposure, due to changes, in its natural gas sales
revenue and supply costs. The Company has entered into commodity futures
contracts and commodity price swaps to hedge its gross margin exposure. The
Company utilizes commodity futures contracts and commodity price swaps for
hedging firmly committed sales transactions and monitors its exposure daily to
ensure overall effectiveness of its hedge positions.

     At September 30, 1998, the notional principal amounts of the futures
contracts were $6.3 million, maturing through February, 1999. As the contracts
were executed on September 30, 1998, no gain or loss, realized or unrealized,
has been recorded. The Company committed to a commodity price swap at September
30, 1997 for natural gas volumes during the winter season with a notional
principal amount of $2.3 million, maturing through February, 1998. For 1998, the
realized gain associated with this swap was $0.4 million.

Concentration of Credit

Financial instruments that subject the Company to concentrations of credit risk
consist principally of trade receivables. Tire manufacturers comprise a
significant portion of the Company's trade receivable balance. At September 30,
1998 and 1997, the Company had trade receivables of approximately $48.5 million
and $62.6 million, respectively, from tire manufacturers. Although the Company's
exposure to credit risk associated with nonpayment by tire manufacturers is
affected by conditions or occurrences within the tire industry, trade
receivables from the tire manufacturers were current at September 30, 1998, and
no such manufacturer exceeded 5% of the Company's receivables at that date.

Note P Financial Information by Industry Segment & Geographic Area

The Company's business consists of two segments, the Specialty Chemicals and
Materials Group and Energy Group. A description of the Company's two business
segments and their products,

  46 
<PAGE>   27
- --------------------------------------------------------------------------------
                        notes to consolidated financial statements (continued)
- --------------------------------------------------------------------------------


services, and markets served is included in Note O. The Energy Group is located
exclusively in the United States and has no export sales. Energy Group sales for
1996 include sales to a major customer in the amount of $278.0 million.

     Financial information by geographic area was as follows:

                                          --------------------------------------
    Years ended September 30                 1998         1997         1996
================================================================================
    Dollars in millions

    Sales
    United States:
      Sales, excluding export sales
        Specialty Chemicals
           and Materials                    $ 563.7      $ 566.9      $ 526.6
        Energy                                210.9        199.7        422.0
      Export sales                            119.6         93.9        109.7
- --------------------------------------------------------------------------------
           Total                              894.2        860.5      1,058.3
    Europe                                    598.6        603.8        638.6
    Other areas                               284.2        302.1        281.5
- --------------------------------------------------------------------------------
           Total                            1,777.0      1,766.4      1,978.4
    Less: Eliminations                        129.2        136.4        122.1
- --------------------------------------------------------------------------------
           Net sales                       $1,647.8     $1,630.0     $1,856.3
================================================================================

    Operating Profit
    United States:
        Specialty Chemicals
           and Materials                     $ 90.1      $ 107.3      $ 142.3
        Energy                                 15.1          6.6         23.0
    Europe                                     82.0         67.0         99.2
    Other areas(a)                            (31.0)         6.0         19.0
- --------------------------------------------------------------------------------
           Total operating profit             156.2        186.9        283.5
- --------------------------------------------------------------------------------
    Interest expense                           42.0         43.2         41.7
    General corporate/other
      expenses, net(b)                         31.4         26.6         29.2
    Costs related to divested business          5.1           --           --
    Gain on sale of business                     --           --        (38.9)
    Gain on sale of equity securities         (90.3)          --        (28.3)
- --------------------------------------------------------------------------------
           Income before income
             taxes                          $ 168.0      $ 117.1      $ 279.8
================================================================================

    Depreciation and Amortization
    Specialty Chemicals and
      Materials                             $ 113.5      $ 107.6       $ 93.8
    Energy                                      1.7          2.0          2.9
    General corporate                           0.2          0.3          0.3
- --------------------------------------------------------------------------------
           Total                            $ 115.4      $ 109.9       $ 97.0
================================================================================

    Fixed Asset Additions
    Specialty Chemicals
      and Materials                         $ 151.3      $ 157.4      $ 207.7
    Energy                                     34.2          5.4          0.5
    General corporate                           1.9           --          0.9
- --------------------------------------------------------------------------------
           Total                            $ 187.4      $ 162.8      $ 209.1
================================================================================

    Identifiable Assets
    United States:
        Specialty Chemicals
           and Materials                    $ 629.2      $ 602.6      $ 529.2
        Energy                                121.3         88.4         79.7
    Europe                                    506.1        434.1        494.8
    Other areas                               321.5        405.6        403.7
    General corporate(c)                      136.0        208.9        270.8
    Equity in affiliates-Europe                --            6.8          9.3
    Equity in affiliates-Other areas           91.1         79.3         70.1
- --------------------------------------------------------------------------------
           Total                           $1,805.2     $1,825.7     $1,857.6
================================================================================




(a) Results for 1998 include a $60.0 million pretax asset impairment charge
    related to an Indonesian carbon black facility.

(b) General corporate/other expenses, net, include corporate management costs
    reduced by investment income.
 
(c) General corporate assets include cash, short-term investments, investments
    other than equity basis, income taxes receivable, deferred taxes and
    headquarters' assets.

Note Q Unaudited Quarterly Financial Information

Unaudited financial results, by quarter for the fiscal years ended September 30,
1998 and 1997, are summarized below and should be read in conjunction with
Management's Discussion and Analysis of Financial Condition and Results of
Operations. Certain 1998 items have been reclassified to reflect changes in the
Company's organization during the year.

Dollars in millions,      ------------------------------------------------------
except per share amounts   December    March     June    September       Year
================================================================================

    Fiscal 1998
    Net sales               $435.4    $457.0    $376.3     $379.1    $1,647.8
    Cost of sales            302.2     312.5     247.3      258.9     1,120.9
    Net income                31.5      37.5      33.2(a)    19.4       121.6
    Income applicable
      to common shares      $ 30.6    $ 36.7    $ 32.5     $ 18.6    $  118.4
- --------------------------------------------------------------------------------
    Income per
      common share
      (diluted)(c)          $ 0.41    $ 0.50    $ 0.44     $ 0.26    $   1.61
================================================================================

    Fiscal 1997
    Net sales               $398.8    $432.0    $398.6     $400.6    $1,630.0
    Cost of sales            279.7     305.6     274.2      284.9     1,144.4
    Net income                25.2      29.4      28.7        9.5(b)     92.8
    Income applicable
      to common shares      $ 24.3    $ 28.6    $ 27.9     $  8.7    $   89.5
- --------------------------------------------------------------------------------
    Income per
      common share
      (diluted)(c)          $ 0.32    $ 0.38    $ 0.37     $ 0.12    $   1.19
================================================================================

(a) Includes a $60.0 million pretax asset impairment charge related to an
    Indonesian carbon black facility and a $25.0 million pretax charge related
    to a tantalum ore recovery project. Also includes a $90.3 million pretax
    gain from the sale of K N Energy, Inc. common stock.

(b) Includes asset impairments and severance pretax charges of $18.2 million.

(c) During the first quarter of 1998, the Company adopted Statement of Financial
    Accounting Standards No. 128, "Earnings per Share" ("SFAS No. 128"). As a
    result, fully diluted earnings per share have been replaced by diluted
    earnings per share. The 1997 amounts have been restated to reflect SFAS No.
    128.


                                                                            47

<PAGE>   28


- --------------------------------------------------------------------------------
management responsibility                   
- --------------------------------------------------------------------------------


The accompanying financial statements were prepared by Cabot Corporation in
conformity with generally accepted accounting principles. The Company's
management is responsible for the integrity of these statements and of the data,
estimates and judgments that underlie them.

     Cabot Corporation maintains a system of internal accounting controls
designed to provide reasonable assurance that the Company's assets are
safeguarded from loss or unauthorized use, that transactions are properly
authorized and recorded, and that financial records are reliable and adequate
for public reporting. The standard of reasonable assurance is based on
management's judgment that the cost of such controls should not exceed their
associated benefits. The system is monitored and evaluated on an ongoing basis
by management in conjunction with the Company's internal audit staff,
independent accountants, and the Audit Committee of the Board of Directors.

     PricewaterhouseCoopers LLP, independent accountants, were engaged by the
Company to audit these financial statements. Their audit was conducted in
accordance with generally accepted auditing standards and included a study and
evaluation of the Company's system of internal accounting controls, selected
tests of that system, and related audit procedures as they consider necessary to
render their opinion.

     The Audit Committee of the Board of Directors provides general oversight
responsibility for the financial statements. Composed entirely of Directors who
are not employees of the Company, the Committee meets periodically with Company
management, internal auditors and the independent accountants to review the
quality of the financial reporting and internal controls as well as the results
of the auditing efforts. The internal auditors and independent accountants have
full and direct access to the Audit Committee, with and without management
present.


/s/ Samuel W. Bodman
Samuel W. Bodman
Chief Executive Officer


/s/ Robert L. Culver
Robert L. Culver
Chief Financial Officer


/s/ William T. Anderson
William T. Anderson
Chief Accounting Officer


- --------------------------------------------------------------------------------
                                               report of independent accountants
- --------------------------------------------------------------------------------


To The Directors and Stockholders of Cabot Corporation In our opinion, the
accompanying consolidated balance sheets and the related consolidated statements
of income and of cash flows present fairly, in all material respects, the
financial position of Cabot Corporation and its subsidiaries at September 30,
1998 and 1997, and the results of their operations and their cash flows for each
of the three years in the period ended September 30, 1998, in conformity with
generally accepted accounting principles. These financial statements are the
responsibility of the Company's management; our responsibility is to express an
opinion on these financial statements based on our audits. We conducted our
audits of these statements in accordance with generally accepted auditing
standards which require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement. An audit includes examining on a test basis evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for the opinion expressed above.



/s/ PRICEWATERHOUSECOOPERS LLP


Boston, Massachusetts
October 26, 1998

  

  48



<PAGE>   1
 
                                                                      EXHIBIT 21
 
                               CABOT CORPORATION
 
                            SIGNIFICANT SUBSIDIARIES
                            AS OF SEPTEMBER 30, 1998
 
<TABLE>
<CAPTION>
NAME                                                           JURISDICTION
- ----                                                           ------------
<S>                                                           <C>
Cabot Carbon Limited........................................  England
Cabot G.B. Limited..........................................  England
Cabot B.V. .................................................  The Netherlands
Cabot International Capital Corporation.....................  Delaware
</TABLE>

<PAGE>   1
                                                                      EXHIBIT 23



                       CONSENT OF INDEPENDENT ACCOUNTANTS

We consent to the incorporation by reference in the registration statements of
Cabot Corporation on Form S-3 (File No. 333-64787) and on Form S-8 (File Nos.
33-28699, 33-52940, 33-53659, 333-03683, 333-06629, 333-19103 and 133-19099) of
our report dated October 26, 1998, on our audits of the consolidated financial
statements of Cabot Corporation as of September 30, 1998 and 1997, and for each
of the three fiscal years in the period ended September 30, 1998, which report
is included in this Annual Report on Form 10-K.






                                          PricewaterhouseCoopers LLP


Boston, Massachusetts
December 21, 1998


















<PAGE>   1
 
                                                                      EXHIBIT 24
 
                               POWER OF ATTORNEY
 
     We, the undersigned directors and officers of Cabot Corporation, hereby
severally constitute and appoint Robert Rothberg and Sarah W. Saunders, and each
of them, our true and lawful attorneys with full power to (i) sign for us and in
our names in the capacities indicated below Annual Reports on Form 10-K pursuant
to Section 13 or 15(d) of the Securities Exchange Act of 1934 of Cabot
Corporation for the fiscal year ended September 30, 1998, and any and all
amendments thereto, hereby ratifying and confirming our signatures as they may
be signed by our said attorneys, or any of them, to said Reports and to any and
all amendments to said Reports; and (ii) to file such Reports and amendments
with the Securities and Exchange Commission and with applicable stock exchanges
on behalf of Cabot Corporation.
 
     WITNESS our hands and common seal on the date set forth below.
 
<TABLE>
<CAPTION>
                   SIGNATURE                                    TITLE                      DATE
                   ---------                                    -----                      ----
<C>                                               <S>                                <C>
 
              /s/ SAMUEL W. BODMAN                Director, Chairman and Chief       November 13, 1998
- ------------------------------------------------    Executive Officer
                Samuel W. Bodman
 
             /s/ KENNETT F. BURNES                Director and President             November 13, 1998
- ------------------------------------------------
               Kennett F. Burnes
 
              /s/ ROBERT L. CULVER                Executive Vice President and       November 13, 1998
- ------------------------------------------------    Chief Financial Officer
                Robert L. Culver
 
            /s/ WILLIAM T. ANDERSON               Controller                         November 13, 1998
- ------------------------------------------------
              William T. Anderson
 
              /s/ JANE C. BRADLEY                 Director                           November 13, 1998
- ------------------------------------------------
                Jane C. Bradley
 
              /s/ JOHN G.L. CABOT                 Director                           November 13, 1998
- ------------------------------------------------
                John G.L. Cabot
 
             /s/ JOHN S. CLARKESON                Director                           November 13, 1998
- ------------------------------------------------
               John S. Clarkeson
 
            /s/ ARTHUR L. GOLDSTEIN               Director                           November 13, 1998
- ------------------------------------------------
              Arthur L. Goldstein
 
            /s/ ROBERT P. HENDERSON               Director                           November 13, 1998
- ------------------------------------------------
              Robert P. Henderson
 
              /s/ ARNOLD S. HIATT                 Director                           November 13, 1998
- ------------------------------------------------
                Arnold S. Hiatt
 
               /s/ GAUTAM S. KAJI                 Director                           November 13, 1998
- ------------------------------------------------
                 Gautam S. Kaji
</TABLE>
<PAGE>   2
 
<TABLE>
<CAPTION>
                   SIGNATURE                                    TITLE                      DATE
                   ---------                                    -----                      ----
<C>                                               <S>                                <C>
              /s/ JOHN H. MCARTHUR                Director                           November 13, 1998
- ------------------------------------------------
                John H. McArthur
 
           /s/ RODERICK C.G. MACLEOD              Director                           November 13, 1998
- ------------------------------------------------
             Roderick C.G. MacLeod
 
              /s/ JOHN F. O'BRIEN                 Director                           November 13, 1998
- ------------------------------------------------
                John F. O'Brien
 
              /s/ DAVID V. RAGONE                 Director                           November 13, 1998
- ------------------------------------------------
                David V. Ragone
 
           /s/ CHARLES P. SIESS, JR.              Director                           November 13, 1998
- ------------------------------------------------
             Charles P. Siess, Jr.
 
              /s/ MORRIS TANENBAUM                Director                           November 13, 1998
- ------------------------------------------------
                Morris Tanenbaum
 
              /s/ LYDIA W. THOMAS                 Director                           November 13, 1998
- ------------------------------------------------
                Lydia W. Thomas
 
              /s/ MARK S. WRIGHTON                Director                           November 13, 1998
- ------------------------------------------------
                Mark S. Wrighton
</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR 
<PERIOD-END>                               SEP-30-1998
<FISCAL-YEAR-END>                          SEP-30-1998
<CASH>                                              40
<SECURITIES>                                         0
<RECEIVABLES>                                      289
<ALLOWANCES>                                         5
<INVENTORY>                                        251
<CURRENT-ASSETS>                                   619
<PP&E>                                           1,914
<DEPRECIATION>                                     936
<TOTAL-ASSETS>                                   1,805
<CURRENT-LIABILITIES>                              536
<BONDS>                                            316
                                0
                                         62
<COMMON>                                            67
<OTHER-SE>                                         577
<TOTAL-LIABILITY-AND-EQUITY>                     1,805
<SALES>                                          1,648
<TOTAL-REVENUES>                                 1,653
<CGS>                                            1,121
<TOTAL-COSTS>                                    1,121
<OTHER-EXPENSES>                                    92
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  42
<INCOME-PRETAX>                                    168
<INCOME-TAX>                                        60
<INCOME-CONTINUING>                                122
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       122
<EPS-PRIMARY>                                     1.80<F1>
<EPS-DILUTED>                                     1.61<F1>
<FN>
<F1>The EPS-Primary amount represents basic earnings per share and the 
EPS-Diluted amount represents diluted earnings per share, computed in 
accordance with Statement of Financial Accounting Standards No. 128, "Earnings 
Per Share."
</FN>
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED> 
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                              39
<SECURITIES>                                         0
<RECEIVABLES>                                      295
<ALLOWANCES>                                         6
<INVENTORY>                                        247
<CURRENT-ASSETS>                                   613
<PP&E>                                           1,760
<DEPRECIATION>                                     838
<TOTAL-ASSETS>                                   1,826
<CURRENT-LIABILITIES>                              543
<BONDS>                                            286
                                0
                                         66
<COMMON>                                           136
<OTHER-SE>                                         526
<TOTAL-LIABILITY-AND-EQUITY>                     1,826
<SALES>                                          1,630
<TOTAL-REVENUES>                                 1,637
<CGS>                                            1,144
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                   116
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  43
<INCOME-PRETAX>                                    117
<INCOME-TAX>                                        42
<INCOME-CONTINUING>                                 93
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                        93
<EPS-PRIMARY>                                     1.33<F1>
<EPS-DILUTED>                                     1.19<F1>
<FN>
<F1>The EPS-Primary amount represents basic earnings per share and the EPS-Diluted
amount represents diluted earnings per share, computed in accordance with
Statements of Financial Accounting Standards No. 128, "Earnings Per Share."
</FN>
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED> 
<CURRENCY> U.S. DOLLARS
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1996
<PERIOD-START>                             OCT-01-1995
<PERIOD-END>                               SEP-30-1996
<EXCHANGE-RATE>                                      1
<CASH>                                              58
<SECURITIES>                                         0
<RECEIVABLES>                                      369
<ALLOWANCES>                                         5
<INVENTORY>                                        260
<CURRENT-ASSETS>                                   710
<PP&E>                                           1,712
<DEPRECIATION>                                     809
<TOTAL-ASSETS>                                   1,857
<CURRENT-LIABILITIES>                              528
<BONDS>                                            322
                                0
                                         69
<COMMON>                                           136
<OTHER-SE>                                         540
<TOTAL-LIABILITY-AND-EQUITY>                     1,857
<SALES>                                          1,856
<TOTAL-REVENUES>                                 1,865
<CGS>                                            1,310
<TOTAL-COSTS>                                    1,310
<OTHER-EXPENSES>                                    94
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  42
<INCOME-PRETAX>                                    280
<INCOME-TAX>                                        98
<INCOME-CONTINUING>                                194
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       194
<EPS-PRIMARY>                                     2.74<F1>
<EPS-DILUTED>                                     2.42<F1>
<FN>
<F1>The EPS-Primary amount represents basic earnings per share and the EPS-Diluted
amount represents diluted earnings per share, computed in accordance with
Statement of Financial Accounting Standards No. 128, "Earnings Per Share."
</FN>
        

</TABLE>


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