AAON INC
10-K, 1999-03-25
AIR-COND & WARM AIR HEATG EQUIP & COMM & INDL REFRIG EQUIP
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 10-K


              ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                   For the fiscal year ended December 31, 1998

                       Commission file number: 33-18336-LA


                                   AAON, INC.
                                   ----------
             (Exact name of Registrant as specified in its charter)


             Nevada                                              87-0448736
             ------                                              ----------
  (State or other jurisdiction                                 (IRS Employer
of incorporation or organization)                            Identification No.)

   2425 South Yukon, Tulsa, Oklahoma                               74107
   ---------------------------------                               -----
(Address of principal executive offices)                         (Zip Code)

       Registrant's telephone number, including area code: (918) 583-2266


           Securities registered pursuant to Section 12(g) of the Act:

                          Common Stock, par value $.004
                          -----------------------------
                                (Title of Class)

                   Rights to Purchase Series A Preferred Stock
                   -------------------------------------------
                                (Title of Class)

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 Registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ ]

The aggregate market value of Registrant's  voting stock held by  non-affiliates
computed by reference to the closing  price of such stock on March 1, 1999,  was
approximately  $32,076,000.  For  purposes of this  computation,  all  officers,
directors and 5% beneficial owners of Registrant are deemed to be affiliates.

As of March 1, 1999,  Registrant had outstanding a total of 6,225,449  shares of
its $.004 par value Common Stock.

                       DOCUMENTS INCORPORATED BY REFERENCE

Portions of  Registrant's  definitive  Proxy Statement to be filed in connection
with  the  Annual  Meeting  of  Stockholders  to  be  held  May  25,  1999,  are
incorporated into Part III.

<PAGE>

                                TABLE OF CONTENTS

                                                                           Page
Item Number and Caption                                                   Number

PART I


1.       Business.                                                          1

2.       Properties.                                                        4

3.       Legal Proceedings.                                                 5

4.       Submission of Matters to a Vote of Security Holders.               5

PART II

5.       Market for Registrant's Common Equity and Related
            Stockholder Matters.                                            6

6.       Selected Financial Data.                                           7

7.       Management's Discussion and Analysis of Financial Condition
            and Results of Operations.                                      8

7A.      Quantitative and Qualitative Disclosures About Market Risk.       10

8.       Financial Statements and Supplementary Data.                      10

9.       Changes in and Disagreements with Accountants on Accounting
            and Financial Disclosure.                                      10

PART III

10.      Directors and Executive Officers of Registrant.                   11

11.      Executive Compensation.                                           11

12.      Security Ownership of Certain Beneficial Owners and Management.   11

13.      Certain Relationships and Related Transactions.                   11

PART IV

14.      Exhibits, Financial Statement Schedules and Reports on Form 8-K.  12


<PAGE 1>

                                     PART I

Item 1.  Business.

General Development of Business

AAON, Inc., a Nevada corporation  ("AAON-Nevada" or, including its subsidiaries,
the "Company"), was incorporated on August 18, 1987.

AAON,  Inc., an Oklahoma  corporation  ("AAON-Oklahoma"),  was  incorporated  on
August 15,  1988,  for the purpose of acquiring  the assets,  subject to certain
liabilities, of the Heating,  Ventilation and Air-Conditioning ("HVAC") Division
of John Zink  Company  in  Tulsa,  Oklahoma.  On June 16,  1989,  pursuant  to a
Conversion/Exchange Agreement, AAON-Oklahoma became a wholly-owned subsidiary of
AAON-Nevada.

AAON-Oklahoma  is  engaged in the  manufacture  and sale of  commercial  rooftop
air-conditioners and heating equipment.

On December 30, 1991, AAON Coil Products,  Inc. ("ACP", formerly CP/AAON, Inc.),
a Texas  corporation  organized as a wholly-owned  subsidiary of AAON-Nevada for
such  purpose,  purchased  most of the assets of Coils Plus,  Inc., of Longview,
Texas, which manufactures coils used in the products of AAON-Oklahoma.

Products and Markets

The   Company   engineers,   manufactures   and   markets   commercial   rooftop
air-conditioning,  heating  and heat  recovery  equipment  and  air-conditioning
coils.  Its products serve the commercial  and industrial new  construction  and
replacement  markets.  While to date  virtually all of the Company's  sales have
been to the domestic market,  concerted efforts began in 1993 to develop foreign
sales  which  accounted  for  approximately  2% of its  sales  last year and are
projected to increase in coming years.

The rooftop  market  consists of units  installed on  commercial  or  industrial
structures of generally less than 10 stories in height.

ACP's  coil sales are made to  air-conditioning  unit  manufacturers,  including
AAON-Oklahoma, and to the commercial/industrial general building market.

The size of these  markets is  determined  primarily by the number of commercial
and industrial building completions. The replacement market consists of products
installed  to  replace  existing  units/components  which  are worn or  damaged.
Historically,  approximately  half of the  industry's  market has  consisted  of
replacement units.

The commercial and  industrial  new  construction  market is subject to cyclical
fluctuations  in that it is  generally  tied to  housing  starts,  but has a lag
factor of 6-18 months.  Housing starts, in turn, are affected by such factors as
interest rates, the state of the economy, population growth and the relative age
of the population.  When new  construction  is down, the Company  emphasizes the
replacement market.

Based on its 1998 level of sales,  approximately $107 million, the Company has a
10% share of the rooftop market and a 1% share of the coil market. Approximately
65% of the  Company's  sales  now  come  from  new  construction  and  35%  from
renovation/replacements.  The  percentage  of sales  (for new  construction  vs.
replacement)  to particular  customers is related to their stage of development,
e.g., Target and Wal-Mart, 80% new construction and 20% replacement.

The Company purchases certain components,  fabricates sheet metal and tubing and
then  assembles  and tests its  finished  products.  The  finished  products  of
AAON-Oklahoma consist of a single unit system containing heating, cooling and/or
heat  recovery  components  in a  self-contained  cabinet,  referred  to in  the
industry  as  "unitary"  products.  The  finished  products  of ACP  are  coils,
consisting of a sheet metal casing with tubing and fins contained  therein.

The Company now has three groups of rooftop  products:  its RK Series,  which is
offered in 18 cooling sizes ranging from 3 to 60 tons;  its RF Series,  which is
offered in nine cooling  sizes  ranging from 40 to 130 tons;  and its HA Series,
which  is  a  horizontal   discharge   package  for  either  rooftop  or  ground
installation, offered in nine sizes ranging from 4 to 50 tons.

<PAGE 2>

AAON-Oklahoma's engineers have developed a heat recovery wheel for its RK and RF
units.  The product  responds to  requirements  of the U.S.  Clean Air Act which
mandate  increased fresh air in commercial  structures.  This product,  which is
marketed under the name  AAONAIRE(R),  increases the capacity of AAON HVAC units
by up to 50% with no  additional  energy  cost.  The  Company  has been issued a
patent on the  adaptation  of this product to its units.  This  enhancement  was
introduced in January 1995. The energy savings and comfort improvement  afforded
by the heat recovery wheel have been proven by numerous installations during the
past year,  but sales to date,  while  increasing,  account  for a minor part of
revenues.

AAON-Oklahoma's   products   are  designed  to  compete  on  the  high  side  of
standardized, packaged rooftop products. Accordingly, its prices range from $300
to $550 per ton of cooling,  which is approximately 5%, on average,  higher than
other standardized products. Performance characteristics of these products range
in cooling  capacity from  32,900-1,563,469  BTU's and in heating  capacity from
69,000-1,680,000   BTU's.  All  of  the  Company's  rooftop  products  meet  the
Department  of  Energy's  efficiency  standards,  which are  designed to set the
maximum amount of energy to be used in producing a given amount of cooling.

A typical commercial  building  installation  requires a ton of air-conditioning
for every 300-400 square feet or, for a 100,000  square foot building,  250 tons
of air-conditioning, which would involve multiple units.

In 1998, ACP introduced  additional  products,  consisting of air handling units
and condensing units.  While the Company  anticipates sales of these products to
become significant in future years, sales to date have been modest.

Major Customers

The Company's  largest  customers  last year were Wal-Mart  Stores,  Inc.,  Home
Depot,  Inc., and Target Stores,  Inc. Sales to Wal-Mart,  Home Depot and Target
were 21%, 8% and 7% of total sales,  respectively,  in 1998  compared to 11%, 6%
and 11%,  respectively,  in 1997. The Company has no written contract with these
customers.

The loss of any of the above customers  would have a material  adverse effect on
the Company.  However,  with the continuing  expansion of the Company's customer
base,  management  believes  that the extent of its  dependence  on sales to its
major customers will diminish over a period of time.

In order to  diversify  its  customer  base,  the  Company  has  added to and/or
upgraded its sales representation in various markets.

Sources and Availability of Raw Materials

The most  important  materials  purchased  by the Company are steel,  copper and
aluminum, which are obtained from domestic suppliers. The Company also purchases
from other domestic  manufacturers  certain components,  including  compressors,
electric  motors and  electrical  controls  used in its  products.  The  Company
endeavors to obtain the lowest  possible  cost in its purchases of raw materials
and components, consistent with meeting specified quality standards. The Company
is not  dependent  upon  any  one  source  for  its raw  material  or the  major
components of its manufactured products, but AAON-Oklahoma  purchases all of its
coils from ACP. By having multiple suppliers,  the Company believes that it will
have adequate sources of supplies to meet its manufacturing requirements for the
foreseeable future.

Further,  the Company attempts to limit the impact of increases in raw materials
and purchased component prices on its profit margins by negotiating with each of
its major suppliers on a term basis from six months to three years.

<PAGE 3>

Distribution

The Company utilizes a direct sales staff of nine individuals and  approximately
83 independent manufacturer representatives' organizations having 104 offices to
market its products in the United States. The Company also has one international
sales organization, which utilizes 10 distributors in other countries. Sales are
made directly to the contractor or end user,  with shipments being made from the
Company's  Tulsa  and  Longview  plants  to the job  site.  Billings  are to the
contractor  or end user,  with a commission  paid  directly to the  manufacturer
representative.

AAON-Oklahoma's  products  and sales  strategy  focus on a "niche"  market.  The
targeted  market for its rooftop  equipment  is  customers  seeking a product of
better  quality  than  offered,  and/or  options not  offered,  by  standardized
manufacturers.

To support and service its  customers and the ultimate  consumer,  AAON-Oklahoma
provides parts availability through three independent parts distributors and has
a  factory  service  organization  at its  Tulsa  plant.  Also,  a number of the
manufacturer  representatives  utilized  by the  Company  have their own service
organizations,  which, together with the Company, provide the necessary warranty
work and/or normal service to customers.

The  Company's  warranty on its products is: for parts only,  the earlier of one
year from the date of first use or 15 months from date of shipment; compressors,
an additional four years; and on gas-fired heat exchangers (if  applicable),  10
years.

Research and Development

All  R&D   activities  of  the  Company  are   company-sponsored,   rather  than
customer-sponsored.  Ongoing work involves the HA Series,  component  evaluation
and refinement, development of control systems and new product development. This
work will cost  approximately  $200,000  per year and is  budgeted  as a normal,
recurring expense.

Backlog

The Company had a current backlog as of March 1, 1999, of $29,833,000,  compared
to  $37,482,000  at March 1,  1998.  The  current  backlog  consists  of  orders
considered  by  management  to be firm and  substantially  all of which  will be
filled by August 1, 1999; however, the orders are subject to cancellation by the
customers.

Working Capital Practices

Working  capital  practices in the industry  center on inventories  and accounts
receivable.  The Company regularly reviews its working capital components with a
view to maintaining the lowest level consistent with requirements of anticipated
levels  of   operation.   Its   greatest   needs  arise  during  the  months  of
July-November,  the peak season for inventory (primarily purchased material) and
accounts  receivable.  The Company's working capital  requirements are generally
met through a bank revolving credit facility, which currently permits borrowings
up to $15,150,000. The Company believes that it will have sufficient bank credit
available to meet its working capital needs through 1999 and beyond.

Seasonality

Sales of the  Company's  products are  moderately  seasonal with the peak period
being July-November of each year.

Competition

In the domestic  market,  the Company competes  primarily with Trane Company,  a
division of American Standard, Inc., Carrier Corporation, a subsidiary of United
Technologies  Corporation,  Lennox  Industries,  Inc.,  and  York  International
Corporation.  All of these competitors are substantially larger and have greater
resources than the Company. The Company competes primarily on the basis of total
value, quality, function, serviceability,  efficiency,  availability of product,
product line  recognition and  acceptability  of sales outlet.  However,  in new
construction   where  the   contractor  is  the   purchasing   decision   maker,
AAON-Oklahoma  often is at a competitive  disadvantage on sales of rooftop units
because of the emphasis  placed on initial  cost;  whereas,  in the  replacement
market and other  owner-controlled  purchases  of such units,  the Company has a
better  chance of getting the  business  since  quality and  long-term  cost are
generally taken into account.

<PAGE 4>

Employees

As of March 1, 1999, the Company had 872 employees and 99  temporaries,  none of
whom are  represented  by unions.  Management  considers its relations  with its
employees to be good.

Patents, Trademarks, Licenses and Concessions

The Company does not consider any patents,  trademarks,  licenses or concessions
held by it to be material to its business  operations,  other than  possibly the
patent  issued  regarding the heat  recovery  wheel option known as  AAONAIRE(R)
discussed under "Products and Markets".

Environmental Matters

Laws  concerning  the  environment  that  affect or could  affect the  Company's
domestic  operations  include,  among others, the Clean Water Act, the Clean Air
Act, the Resource  Conservation  and Recovery Act, the  Occupational  Safety and
Health Act, the National  Environmental Policy Act, the Toxic Substances Control
Act, regulations  promulgated under these Acts, and any other federal,  state or
local laws or regulations governing  environmental matters. The Company believes
that it presently  complies with these laws and that future  compliance will not
materially adversely affect the Company's earnings or competitive position.


Item 2.  Properties.

The plant and office  facilities of  AAON-Oklahoma  consist of a 337,000  square
foot building (322,000 sq. ft. of  manufacturing/warehouse  space and 15,000 sq.
ft. of office  space)  located on a 12-acre  tract of land at 2425 South  Yukon,
Tulsa,   Oklahoma  (the  "original   facility"),   and  a  457,000  square  foot
manufacturing/warehouse  building and a 22,000 square foot office  building (the
"expansion  facility") located on a 40-acre tract of land across the street from
the original facility. Both plants are of sheet metal construction.

The  original  facility's  manufacturing  area  is in a  heavy  industrial  type
building,  with  total  coverage  by  bridge  cranes,  containing  manufacturing
equipment  designed  for  sheet  metal  fabrication  and  metal  stamping.   The
manufacturing equipment contained in the original facility consists primarily of
automated sheet metal  fabrication  equipment,  supplemented  by presses,  press
breaks and NC  punching  equipment.  Assembly  lines  consist of four  cart-type
conveyor  lines with  variable line speed  adjustment,  three of which are motor
driven. Subassembly areas and production line manning are based upon line speed.
The manufacturing  facility is 1,140 feet in length and varies in width from 390
feet to 220  feet.  Production  at this  facility  averaged  approximately  $8.6
million per month in 1998, which is 52% of the estimated  capacity of the plant.
Management  deems this plant to be nearly ideal for the type of rooftop products
being manufactured by the Company.

The  expansion  facility,  which was  purchased  on December  31,  1997,  is 24%
(108,000 sq. ft.) utilized by the Company and 76% leased to third  parties.  The
Company  uses 8,000 sq. ft.  for office  space and 20,000 sq. ft. for  warehouse
space and will utilize 80,000 sq. ft. for  manufacturing  in 1999. The remaining
349,000 sq. ft. will afford the Company  additional  plant and office  space for
long-term growth.

The  operations of ACP are conducted in a  plant/office  building at 203-207 Gum
Springs Road in Longview, Texas, containing 138,000 square feet on 14 acres. The
manufacturing  area  (approximately  131,000  square  feet)  is  located  in two
120-foot wide sheet metal  buildings  connected by an adjoining  structure and a
28,000 square foot building  adjacent  thereto.  The facility is built for light
industrial manufacturing.

<PAGE 5>

Bank  borrowings  of the  Company,  totaling  $6,060,000  at March 1, 1999,  are
secured, in part, by its Longview buildings.


Item 3.  Legal Proceedings.

The  Company is not a party to any pending  legal  proceeding  which  management
believes  is  likely to result in a  material  liability  and no such  action is
contemplated by or, to the best of its knowledge,  has been  threatened  against
the Company.


Item 4.  Submission of Matters to a Vote of Security Holders.

No matter was submitted to a vote of security holders,  through  solicitation of
proxies or otherwise,  during the period from October 1, 1998,  through December
31, 1998.

<PAGE 6>

                                     PART II


Item 5.  Market for Registrant's Common Equity and Related Stockholder Matters.

The  Company's  Common Stock is traded on the NASDAQ  National  Market under the
symbol "AAON".  The range of sales prices for the Company's  Common Stock during
the last two years, as reported by National  Association of Securities  Dealers,
Inc., was as follows:


       Quarter Ended                             High Bid        Low Bid
       -------------                             --------        -------
       March 31, 1997                             $  7.60        $  4.32
       June 30, 1997                              $  8.56        $  5.48
       September 30, 1997                         $  8.46        $  7.16
       December 31, 1997                          $  9.44        $  6.40

       March 31, 1998                             $ 11.75        $  6.63
       June 30, 1998                              $ 11.50        $  9.75
       September 30, 1998                         $ 11.00        $  6.75
       December 31, 1998                          $ 10.50        $  7.50

On March 1, 1999, there were 195 holders of record, and 2,039 beneficial owners,
of the Company's Common Stock.

Since its inception,  no cash  dividends have been paid on the Company's  Common
Stock  and  the  Company  does  not  anticipate  paying  cash  dividends  in the
foreseeable  future.  There is a negative covenant under the Company's Revolving
Credit and Term Loan  Agreement  which  prohibits the  declaration or payment of
such dividends. The Company paid a 10% stock dividend on March 27, 1995.

<PAGE 7>

Item 6.  Selected Financial Data.

The following  selected  financial data should be read in  conjunction  with the
financial statements and related notes thereto for the periods indicated,  which
are included elsewhere in this report.

<TABLE>
                                                                 Years ended December 31,
                                          --------------------------------------------------------------------
   Results of Operations:                     1998           1997           1996           1995           1994
   ----------------------                 --------       --------       --------       --------       --------
                                                        (In thousands, except earnings per share)
<CAPTION>
<S>                                       <C>            <C>            <C>            <C>            <C>     
   Net sales                              $106,781       $ 81,676       $ 62,845       $ 67,346       $ 79,542
   Net income                             $  5,230       $  3,022       $  2,075       $  2,069       $  5,101
   Basic earnings per share               $    .84       $    .49       $    .34       $    .34       $    .84
   Diluted earnings per share             $    .82       $    .48       $    .33       $    .33       $    .81

                                                                       December 31,
                                          --------------------------------------------------------------------
   Balance Sheet Data:                        1998           1997           1996           1995           1994
   -------------------                    --------       --------       --------       --------       --------
                                                                     (In thousands)

   Total assets                           $ 50,506       $ 42,810       $ 35,569       $ 32,212       $ 32,562
   Long-term debt                         $ 10,980       $ 12,857       $  8,976       $ 10,695       $ 10,648
   Stockholders' equity                   $ 24,411       $ 18,873       $ 15,640       $ 13,546       $ 11,461
</TABLE>

Basic  earnings  per common  share were  computed by dividing  net income by the
weighted  average  number  of  shares of common  stock  outstanding  during  the
reporting  period.  Diluted  earnings  per common share were  determined  on the
assumed  exercise of dilutive  options,  as  determined by applying the treasury
stock method.

<PAGE 8>

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

Set forth below is income statement  information with respect to the Company for
years 1998, 1997 and 1996:

<TABLE>
                                                      Years ended December 31,
                                           --------------------------------------------
                                                1998              1997             1996
                                           ---------         ---------        ---------
                                                           (In thousands)
<CAPTION>
<S>                                        <C>               <C>              <C>      
Net sales                                  $ 106,781         $  81,676        $  62,845

Cost of sales                                 86,952            68,605           51,797
                                           ---------         ---------        ---------
   Gross profit                               19,829            13,071           11,048

Selling, general and 
  administrative expenses                     10,626             8,146            6,413
                                           ---------         ---------        ---------
   Income from operations                      9,203             4,925            4,635

Interest expense                               1,017               687              838

Other (income) expense                          (359)              167              406
                                           ---------         ---------        ---------
   Income before income taxes                  8,545             4,071            3,391

Income tax provision                           3,315             1,049            1,316
                                           ---------         ---------        ---------
   Net income                              $   5,230         $   3,022        $   2,075
                                           =========         =========        =========
</TABLE>

Results of Operations

Net sales  increased  approximately  31% in 1998 as compared  to 1997,  and 1997
sales were 30% greater than in 1996. The increase in sales in 1998 and 1997 were
attributable to increased sales to the Company's  entire customer base, which is
expected to continue in 1999.

Gross profit  increased in 1998 to 18.6% compared to 16.0% in 1997, and 17.6% in
1996.  The  increase  in margins in 1998 was  attributable  to the  addition  of
automated sheet metal  equipment,  the elimination of outsourcing of sheet metal
production and a slight improvement in labor shortage.

While SG&A expenses  increased by 30% in 1998 compared to 1997,  these  expenses
remained relatively the same in 1998, 1997 and 1996 as a percent of sales.

Interest  expense was higher in 1998  compared to 1997 and 1996 due to increased
capital  expenditures and greater sales and accounts  receivable.  Borrowings in
all three years were minimized by profits and effective control of inventories.

The  $359,000 of other  income in 1998,  compared to other  expenses in 1997 and
1996, is primarily  attributable to rental income from the Company's  "expansion
facility" (see Item 2).

Income before income taxes in 1996-1998 were relatively the same as a percent of
sales.

The  income tax  provisions  in 1998 and 1997 were  affected  by  permanent  tax
deductions and credits.

Financial Condition and Liquidity

Accounts  receivable  increased  by  $3,915,000  and  inventories  increased  by
$1,508,000 at December 31, 1998,  compared to year end 1997, due to the increase
in sales during 1998.

<PAGE 9>

Property, Plant and Equipment at December 31, 1998, was approximately $2 million
higher  than  at  year  end  1997  due to  equipment  purchases,  in  excess  of
depreciation.  All capital  expenditures in 1998 were financed out of cash flow,
borrowings  under  the  Company's  revolving  credit  bank  loan  and  equipment
financing.

The size of accounts payable at December 31, 1998 and 1997 primarily reflect the
inventories  and sales volumes in each of those years and the timing of payments
to creditors.

Also,  accrued  liabilities  at  year-end  1998 and 1997  reflect  the amount of
reserves (warranty and commissions) related to sales and the timing of estimated
income tax payments.

The capital needs of the Company are met primarily by its bank revolving  credit
facility.  Management  believes this bank debt (or comparable  financing),  term
loans and projected profits from operations will provide the necessary liquidity
and capital  resources  to the  Company  for at least the next five  years.  The
Company's belief that it will have the necessary liquidity and capital resources
is based upon its knowledge of the HVAC industry and its place in that industry,
its  ability  to  limit  the  growth  of its  business  if  necessary,  and  its
relationship with its existing bank lender.

The Company's revolving credit line (which currently extends to August 31, 2000)
provides for maximum borrowings of $15,150,000. Interest on this line is payable
monthly at the Wall Street  Journal  prime rate less .5% or LIBOR plus 1.7%,  at
the  election  of the  Company.  This  loan is  collateralized  by the  accounts
receivable,  inventory  and general  intangibles  of the Company's two operating
subsidiaries.

Year 2000 Disclosure ("Y2K")

The Company  believes that it is now fully compliant in regard to the "Year 2000
Problem", insofar as its internal operations are concerned,  except for embedded
technology in two major sheet metal fabricating  machines which are scheduled to
be corrected by June 30, 1999. With regard to its suppliers, in September, 1998,
the Company sent 800  questionnaires  to determine  their state of readiness and
the readiness of the suppliers'  suppliers.  To date approximately 350 responses
have been received, most indicating that they are in compliance.  The Company is
following up with those not in compliance and those who have not  responded.  On
or before the start of the fourth  quarter of 1999,  the  Company  will be doing
business only with suppliers who are in compliance.

The Company does not  anticipate  incurring  material  costs in  addressing  Y2K
issues.

Subject to timely  correction  of the  embedded  technology  in the sheet  metal
fabricating  machines  mentioned  above,  the  Company  does not believe it will
experience any material adverse  consequences to its  manufacturing  operations,
internally or externally, due to Y2K, but management can conceive of problems in
receiving  payments  from  customers  if there  should  be  wide-spread  defects
affecting the financial/banking industry.

If the Company has any concerns as to specific  suppliers,  it would  commence a
buildup of  inventory  of such parts  starting in the third  quarter of 1999 and
establish alternate suppliers for those in question.

Forward-Looking Statements

This Annual Report includes  "forward-looking  statements" within the meaning of
the Private  Securities  Litigation Reform Act of 1995. Words such as "expects",
"anticipates",  "intends",  "plans" "believes",  "seeks",  "estimates",  "will",
variations of such words and similar  expressions  are intended to identify such
forward-looking  statements.  These  statements  are not  guarantees  of  future
performance and involve certain risks,  uncertainties  and assumptions which are
difficult  to  predict.  Therefore,  actual  outcomes  and  results  may  differ
materially  from  what  is  expressed  or  forecasted  in  such  forward-looking
statements.  Readers  are  cautioned  not  to  place  undue  reliance  on  these
forward-looking  statements,  which  speak only as of the date on which they are
made.   The  Company   undertakes   no   obligation   to  update   publicly  any
forward-looking  statements,  whether  as a result  of new  information,  future
events or otherwise. Important factors that could cause actual results to differ
materially from those in the  forward-looking  statements include (1) the timing
and extent of changes in material prices, (2) the effects of fluctuations in the
commercial/industrial  new  construction  market,  (3) the  timing and extent of
changes in interest rates, as well as other competitive factors during the year,
and (4) general economic, market or business conditions.

<PAGE 10>

Item 7A.  Quantitative and Qualitative Disclosures About Market Risk.

While the Company is exposed to changes in interest rates  regarding  $9,970,000
of its total debt of $11,737,000, a hypothetical 10% change in interest rates on
its variable rate  borrowings  would not have a material effect on the Company's
earnings or cash flow.

Foreign  sales  accounted  for  only 2% of the  Company's  sales in 1998 and the
Company accepts payment for such sales only in U.S. dollars;  hence, the Company
is not exposed to any foreign currency exchange rate risk.

Important raw materials purchased by the Company are steel, copper and aluminum,
which are  subject to price  fluctuations.  The  Company  attempts  to limit the
impact of price  increases on these  materials by  negotiating  with each of its
major suppliers on a term basis from six months to three years.


Item 8.  Financial Statements and Supplementary Data.

The financial statements and supplementary data are included at page 16.


Item 9.  Changes  in  and  Disagreements  with  Accountants  on  Accounting  and
         Financial Disclosure.

None.

<PAGE 11>
                                    PART III


Item 10.  Directors and Executive Officers of Registrant.

Incorporated  by reference to the  Company's  definitive  Proxy  Statement to be
filed  with the  Securities  and  Exchange  Commission  in  connection  with the
Company's 1999 Annual Meeting of Stockholders.


Item 11.  Executive Compensation.

Incorporated  by reference to the  Company's  definitive  Proxy  Statement to be
filed  with the  Securities  and  Exchange  Commission  in  connection  with the
Company's 1999 Annual Meeting of Stockholders.


Item 12.  Security Ownership of Certain Beneficial Owners and Management.

Incorporated  by reference to the  Company's  definitive  Proxy  Statement to be
filed  with the  Securities  and  Exchange  Commission  in  connection  with the
Company's 1999 Annual Meeting of Stockholders.


Item 13.  Certain Relationships and Related Transactions.

Incorporated  by reference to the  Company's  definitive  Proxy  Statement to be
filed  with the  Securities  and  Exchange  Commission  in  connection  with the
Company's 1999 Annual Meeting of Stockholders.

<PAGE 12>

                                     PART IV


Item 14.  Exhibits, Financial Statement Schedules and Reports on Form 8-K.

(a)  1. Financial statements.

     See Index to Consolidated Financial Statements on page 15.

     2. Exhibits:

          (3)  (A)    Articles of Incorporation (i)
               (A-1)  Article Amendments (ii)
               (B)    Bylaws (i)
               (B-1)  Amendments of Bylaws (iii)

          (4)  (A)    Second Restated Revolving Credit  and Term Loan  Agreement
                      ("Loan Agreement") and related documents (iv)
               (A-1)  Latest amendments of Loan Agreement (v)
               (B     Rights Agreement dated February 19, 1999 (vi)

          (10)        AAON, Inc. 1992 Stock Option Plan, as amended (vii)

          (21)        List of Subsidiaries (viii)

          (27)        Financial Data Schedule
          -----------------------

    (i)   Incorporated herein by reference to the exhibits to the Company's Form
          S-18 Registration Statement No. 33-18336-LA.

    (ii)  Incorporated  herein by  reference  to the  exhibits to the  Company's
          Annual  Report on Form 10-K for the  fiscal  year ended  December  31,
          1990,  and to the Company's  Forms 8-K dated March 21, 1994, and March
          10, 1997.

    (iii) Incorporated  herein by  reference  to the  Company's  Forms 8-K dated
          March 10,  1997,  May 27,  1998 and  February  25,  1999,  or exhibits
          thereto.

    (iv)  Incorporated  by reference to exhibit to the Company's  Form 8-K dated
          September 25, 1996.

    (v)   Incorporated  herein by reference to exhibits to the  Company's  Forms
          8-K dated September 26, 1997, and March 5, 1999.

    (vi)  Incorporated  by reference to exhibits to the Company's Form 8-K dated
          February 25, 1999, and Form 8-A Registration Statement No. 000-18953.

    (vii) Incorporated  herein by reference to exhibits to the Company's  Annual
          Report on Form 10-K for the fiscal year ended  December 31, 1991,  and
          to the Company's  Form S-8  Registration  Statement No.  33-78520,  as
          amended.

<PAGE 13>

    (viii)Incorporated  herein by reference to exhibit to the Company's Annual
          Report on Form 10-K for the fiscal year ended December 31, 1991.

(b)  The  Company  did not file any  reports on Form 8-K during the period  from
     October 1, 1998, to December 31, 1998.

<PAGE 14>


                                   SIGNATURES

Pursuant to the  requirement of Section 13 or 15(d) of the  Securities  Exchange
Act of 1934, as amended, the Registrant has duly caused this report to be signed
on its behalf by the undersigned, hereunto duly authorized.



                                         AAON, INC.


Dated: March 22, 1999                    By: /s/ Norman H. Asbjornson
                                             -----------------------------------
                                                 Norman H. Asbjornson,
                                                 President


Pursuant to the requirements of the Securities Exchange Act of 1934, as amended,
this  report has been  signed  below by the  following  persons on behalf of the
Registrant and in the capacities and on the dates indicated.


Dated: March 22, 1999                        /s/ Norman H. Asbjornson  
                                             -----------------------------------
                                                 Norman H. Asbjornson
                                                 President and Director
                                                 (principal executive officer)

Dated: March 22, 1999                        /s/ William A. Bowen      
                                             -----------------------------------
                                                 William A. Bowen
                                                 Vice President-Finance and
                                                 Director
                                                 (principal financial officer
                                                  and principal accounting
                                                  officer)

Dated: March 22, 1999                        /s/ John B. Johnson, Jr.  
                                             -----------------------------------
                                                 John B. Johnson, Jr.
                                                 Director

Dated: March 22, 1999                        /s/ Joseph M. Klein       
                                             -----------------------------------
                                                 Joseph M. Klein
                                                 Director

<PAGE 15>
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

                                                                   Page
                                                                   ----
Report of Independent Public Accountants                             16

Consolidated Balance Sheets                                          17

Consolidated Statements of Operations                                18

Consolidated Statements of Stockholders' Equity                      19

Consolidated Statements of Cash Flows                                20

Notes to Consolidated Financial Statements                           21


<PAGE 16>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS



To the Stockholders of AAON, Inc.:


We have audited the  accompanying  consolidated  balance sheets of AAON, Inc. (a
Nevada  corporation)  and subsidiaries as of December 31, 1998 and 1997, and the
related  consolidated  statements of operations,  stockholders'  equity and cash
flows for each of the three years in the period ended  December 31, 1998.  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  in  accordance  with  generally   accepted  auditing
standards.  Those standards 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.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material respects,  the financial position of AAON, Inc. and subsidiaries as
of December  31, 1998 and 1997,  and the results of their  operations  and their
cash flows for each of the three years in the period ended December 31, 1998, in
conformity with generally accepted accounting principles.



                                                ARTHUR ANDERSEN LLP



Tulsa, Oklahoma
 February 5, 1999

<PAGE 17>
<TABLE>
                                   AAON, INC.


                           CONSOLIDATED BALANCE SHEETS 
                           ---------------------------
                      (In thousands, except share amounts)


                                                               DECEMBER 31,
                                                         ----------------------
                                     ASSETS                  1998          1997
                                                         --------      --------
<CAPTION>
<S>                                                      <C>           <C> 
CURRENT ASSETS:  
   Cash                                                  $     25      $     26
   Accounts receivable, net                                17,933        14,018
   Inventories, net                                        12,160        10,652
   Prepaid expenses and other                                 241           445
   Deferred income taxes                                    1,594         1,084
                                                         --------      --------
         Total current assets                              31,953        26,225
                                                         --------      --------
PROPERTY, PLANT AND EQUIPMENT, net                         18,553        16,585
                                                         --------      --------
         Total assets                                    $ 50,506      $ 42,810
                                                         ========      ========

                      LIABILITIES AND STOCKHOLDERS' EQUITY

CURRENT LIABILITIES:
   Accounts payable                                      $  8,478      $  7,137
   Accrued liabilities                                      5,597         3,727
   Current maturities of long-term debt                       757           175
                                                         --------      --------
         Total current liabilities                         14,832        11,039
                                                         --------      --------
DEFERRED TAX LIABILITY                                        283            41
                                                         --------      --------
LONG-TERM DEBT                                             10,980        12,857
                                                         --------      --------
STOCKHOLDERS' EQUITY, per accompanying statements:
     Preferred stock, $.001 par value, 5,000,000
       shares authorized, no shares issued                      -             -
     Common stock, $.004 par value, 50,000,000
       shares authorized, 6,219,449 and  6,176,449
       issued at December 31, 1998 and 1997,
       respectively                                            25            25
     Additional paid-in capital                             8,224         7,916
     Retained earnings                                     16,162        10,932
                                                         --------      --------
         Total stockholders' equity                        24,411        18,873
                                                         --------      --------
         Total liabilities and stockholders' equity      $ 50,506      $ 42,810
                                                         ========      ========

The  accompanying  notes  are an  integral  part of these  consolidated  balance
sheets.
</TABLE>


<PAGE 18>
<TABLE>
                                   AAON, INC.


                      CONSOLIDATED STATEMENTS OF OPERATIONS
                      -------------------------------------
                    (In thousands, except per share amounts)



                                                                       YEARS ENDED DECEMBER 31,
                                                                       ------------------------
                                                             1998                 1997               1996
                                                        ---------            ---------          ---------
<CAPTION>
<S>                                                     <C>                  <C>                <C>      
NET SALES                                               $ 106,781            $  81,676          $  62,845

COST OF SALES                                              86,952               68,605             51,797
                                                        ---------            ---------          ---------
         GROSS PROFIT                                      19,829               13,071             11,048

SELLING, GENERAL AND ADMINISTRATIVE EXPENSES               10,626                8,146              6,413
                                                        ---------            ---------          ---------
         INCOME FROM OPERATIONS                             9,203                4,925              4,635

INTEREST EXPENSE                                            1,017                  687                838

OTHER (INCOME) EXPENSE                                       (359)                 167                406
                                                        ---------            ---------          ---------
         INCOME BEFORE INCOME TAXES                         8,545                4,071              3,391

INCOME TAX PROVISION                                        3,315                1,049              1,316
                                                        ---------            ---------          ---------
         NET INCOME                                     $   5,230            $   3,022          $   2,075
                                                        =========            =========          =========
EARNINGS PER SHARE:
   Basic                                                $     .84            $     .49          $     .34
                                                        =========            =========          =========
   Diluted                                              $     .82            $     .48          $     .33
                                                        =========            =========          =========
WEIGHTED AVERAGE SHARES OUTSTANDING:
     Basic                                              6,202,035            6,159,177          6,118,697
                                                        =========            =========          =========
     Diluted                                            6,385,328            6,303,426          6,301,560
                                                        =========            =========          =========

The accompanying notes are an integral part of these consolidated statements.
</TABLE>


<PAGE 19>
<TABLE>
                                   AAON, INC.


                 CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                 -----------------------------------------------
                                 (In thousands)



                                                         Common Stock              Paid-in        Retained
                                                     Shares       Amount           Capital        Earnings           Total
                                                     ------       ------           -------        --------           -----
<CAPTION>
<S>                                                   <C>           <C>           <C>            <C>             <C>      
BALANCE, JANUARY 1, 1996                              6,113         $ 24          $  7,687       $   5,835       $  13,546

NET INCOME                                                -            -                 -           2,075           2,075

STOCK OPTIONS EXERCISED                                  15            1                18               -              19
                                                     ------       ------          --------       ---------       ---------
BALANCE, DECEMBER 31, 1996                            6,128           25             7,705           7,910          15,640

NET INCOME                                                -            -                 -           3,022           3,022

STOCK OPTIONS EXERCISED                                  48            -               211               -             211
                                                     ------       ------          --------       ---------       ---------
BALANCE, DECEMBER 31, 1997                            6,176           25             7,916          10,932          18,873

NET INCOME                                                -            -                 -           5,230           5,230

STOCK OPTIONS EXERCISED                                  43            -               308               -             308
                                                     ------       ------          --------       ---------       ---------
BALANCE, DECEMBER 31, 1998                            6,219         $ 25          $  8,224       $  16,162       $  24,411
                                                     ======       ======          ========       =========       =========

The accompanying notes are an integral part of these consolidated statements.
</TABLE>


<PAGE 20>
<TABLE>
                                   AAON, INC.


                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                      -------------------------------------
                                 (In thousands)



                                                                                          YEARS ENDED DECEMBER 31,
                                                                                          ------------------------
                                                                                     1998           1997            1996
                                                                               ----------      ---------       ---------
<CAPTION>
<S>                                                                            <C>             <C>             <C>  
CASH FLOWS FROM OPERATING ACTIVITIES:                                          
   Net income                                                                  $    5,230      $   3,022       $   2,075
                                                                               ----------      ---------       ---------
   Adjustments to reconcile net income to net cash provided by operating
     activities-
       Depreciation and amortization                                                2,848          2,517           2,497
       Provision for losses on accounts receivable                                    324            175             450
       Provision for excess and obsolete inventories                                  200             20               -
       Gain on disposition of assets                                                  (48)           (13)              -
       Deferred income taxes                                                         (269)         1,370            (860)
       Change in assets and liabilities-
         Accounts receivable                                                       (4,239)          (654)         (4,143)
         Inventories                                                               (1,708)        (1,532)            (59)
         Prepaid expenses and other                                                   204           (239)            286
         Accounts payable                                                           1,341          1,040           1,673
         Accrued liabilities                                                        1,926           (934)          2,160
                                                                               ----------      ---------       ---------
           Net cash provided by operating activities                                5,809          4,772           4,079
                                                                               ----------      ---------       ---------
CASH FLOWS FROM INVESTING ACTIVITIES:
   Proceeds from sale of property, plant and equipment                                 70             81               -
   Capital expenditures                                                            (4,837)        (9,037)         (2,053)
                                                                               ----------      ---------       ---------
           Net cash used in investing activities                                   (4,767)        (8,956)         (2,053)
                                                                               ----------      ---------       ---------
CASH FLOWS FROM FINANCING ACTIVITIES:
   Borrowings under revolving credit agreement                                     50,239         39,910          32,651
   Payments under revolving credit agreement                                      (54,835)       (37,115)        (31,899)
   Proceeds from long-term debt                                                     3,756          1,260           -
   Payments on long-term debt                                                        (455)           (90)         (3,322)
   Stock options exercised                                                            252            107              19
                                                                               ----------      ---------       ---------
           Net cash provided by (used in) financing activities                     (1,043)         4,072          (2,551)
                                                                               ----------      ---------       ---------
NET DECREASE IN CASH                                                                   (1)          (112)           (525)
                                                                               ----------      ---------       ---------
CASH, beginning of year                                                                26            138             663
                                                                               ----------      ---------       ---------
CASH, end of year                                                              $       25      $      26       $     138
                                                                               ==========      =========       =========

The accompanying notes are an integral part of these consolidated statements.
</TABLE>


<PAGE 21>
                                   AAON, INC.


                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                   ------------------------------------------

                           DECEMBER 31, 1998 AND 1997
                           --------------------------
      (Dollar amounts in thousands, except share and per share information)



1.  BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

AAON, Inc. (the Company, a Nevada corporation) is engaged in the manufacture and
sale  of  commercial  rooftop  air  conditioners,   heating  equipment  and  air
conditioning  coils through its wholly-owned  subsidiaries  AAON, Inc. (AAON, an
Oklahoma  corporation) and AAON Coil Products,  Inc. (ACP, a Texas corporation).
The consolidated  financial  statements  include the accounts of the Company and
its  subsidiaries,  AAON and ACP.  All  significant  intercompany  accounts  and
transactions have been eliminated.

Revenue Recognition

Revenues are recognized at the time of shipment.

Business and Credit Concentrations

The Company's  customers are concentrated  primarily in the domestic  commercial
and industrial new  construction  and  replacement  markets.  No single customer
accounted  for a  significant  amount of the  Company's  accounts  receivable at
December  31,  1998.  The Company  reviews a customer's  credit  history  before
extending  credit.  The Company  establishes an allowance for doubtful  accounts
based upon factors surrounding the credit risk of specific customers, historical
trends and other information.

Sales  to  customers  with  greater  than  10% of  total  sales  consist  of the
following:

                                                Years Ended December 31,
                                             ------------------------------
                                             1998         1997         1996
                                             ----         ----         ----
         Target Stores, Inc.                   *           11%          14%
         Wal-Mart Stores, Inc.                21%          11%           *

         *  - Less than 10%

Inventories

Inventories are valued at the lower of cost or market. Cost is determined by the
first-in, first-out (FIFO) method.

<PAGE 22>

Property, Plant and Equipment

Property,  plant and  equipment  are stated at cost.  Maintenance,  repairs  and
betterments, including replacement of minor items, are charged to expense; major
additions to physical properties are capitalized.  Property, plant and equipment
are  depreciated  using the  straight-line  method over the following  estimated
useful lives:
                                                          Years
                                                          -----
         Buildings                                        10-20
         Machinery and equipment                           3-7
         Furniture and fixtures                            3-5

Warranties

A provision is made for the estimated  cost of warranty  obligations at the time
the related products are sold.  Warranty  expense was $3,617,  $2,356 and $1,547
for the years ended December 31, 1998, 1997 and 1996, respectively.

Earnings Per Share

The Company applies Statement of Financial  Accounting Standards (SFAS) No. 128,
"Earnings Per Share." Basic  earnings per common share were computed by dividing
net income by the weighted average number of shares of common stock  outstanding
during the reporting  period.  Diluted earnings per common share were determined
on the assumed  exercise of dilutive  options,  as  determined  by applying  the
treasury stock method.  At December 31, 1998,  27,500 options were considered to
be anti-dilutive. For the year ended December 31, 1997 and 1996, all outstanding
options were considered  diluted.  A  reconciliation  of net income and weighted
average  shares used in  computing  basic and diluted  earnings  per share is as
follows:
<TABLE>
                                                          For the Year Ended
                                                           December 31, 1998
                                               --------------------------------------
                                                                            Per-Share
                                                 Income        Shares          Amount
                                                 ------        ------       ---------
<CAPTION>
<S>                                            <C>              <C>             <C>
   Basic EPS                            
     Net income                                $  5,230         6,202           $ .84
     Options issued to employees                      -           183               -

   Diluted EPS
     Net income                                $  5,230         6,385           $ .82


                                                           For the Year Ended
                                                            December 31, 1997
                                               --------------------------------------
                                                                            Per-Share
                                                 Income        Shares          Amount
                                                 ------        ------       ---------
   Basic EPS
     Net income                                $  3,022         6,159           $ .49
     Options issued to employees                      -           144               -

   Diluted EPS
     Net income                                $  3,022         6,303           $ .48


<PAGE 23>
                                                           For the Year Ended
                                                            December 31, 1996
                                               --------------------------------------
                                                                            Per-Share
                                                 Income        Shares          Amount
                                                 ------        ------       ---------
   Basic EPS
     Net income                                $  2,075         6,119           $ .34
     Options issued to employees                      -           183               -

   Diluted EPS
     Net income                                $  2,075         6,302           $ .33
</TABLE>


Reclassifications

Certain   reclassifications  have  been  made  to  the  prior  years'  financial
statements to conform with the 1998 presentation. Such reclassifications did not
impact net income.

Use of Estimates

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

New Accounting Pronouncements

In June 1998,  the  Financial  Accounting  Standards  Board issued SFAS No. 133,
"Accounting  for Derivative  Instruments and Hedging  Activities."  SFAS No. 133
establishes  accounting and reporting  standards requiring that every derivative
instrument   (including  certain  derivative   instruments   embedded  in  other
contracts)  be  recorded in the  balance  sheet as either an asset or  liability
measured at its fair value.  Companies must formally  document,  designate,  and
assess the effectiveness of transactions that receive hedge accounting. SFAS No.
133 is effective for fiscal years  beginning  after June 15, 1999.  SFAS No. 133
cannot  be  applied   retroactively  and  must  be  applied  to  (a)  derivative
instruments and (b) certain derivative  instruments embedded in hybrid contracts
that were issued,  acquired, or substantively  modified after December 31, 1997.
The Company has not yet  quantified  the impact of adopting  SFAS No. 133 on its
financial  statements  and has not  determined  the  timing  of or method of the
adoption of SFAS No. 133.  However,  as of December 31, 1998, the Company had no
outstanding derivative instruments.

<TABLE>
Details to Consolidated Balance Sheets
                                                                       December 31,
                                                                ------------------------
                                                                    1998            1997
                                                                --------        --------
<CAPTION>
<S>                                                             <C>             <C>    
ACCOUNTS RECEIVABLE:                                            
   Accounts receivable                                          $ 18,343        $ 14,378
   Less- allowance for doubtful accounts                             410             360
                                                                --------        --------
         Total, net                                             $ 17,933        $ 14,018
                                                                ========        ========
<PAGE 24>
                                                                       December 31,
                                                                ------------------------       
                                                                    1998            1997
                                                                --------        --------
INVENTORIES:
   Raw materials                                                $  8,253        $  7,223
   Work in process                                                 1,628           2,136
   Finished goods                                                  2,629           1,443
                                                                --------        --------
                                                                  12,510          10,802
   Less- allowance for excess and obsolete inventories               350             150
                                                                --------        --------
         Total, net                                             $ 12,160        $ 10,652
                                                                ========        ========
PROPERTY, PLANT AND EQUIPMENT:
   Land                                                         $    874        $    874
   Buildings                                                      12,089          11,865
   Machinery and equipment                                        16,264          11,906
   Furniture and fixtures                                          2,004           1,909
                                                                --------        --------
                                                                  31,231          26,554
   Less- accumulated depreciation                                 12,678           9,969
                                                                --------        --------
         Total, net                                             $ 18,553        $ 16,585
                                                                ========        ========
ACCRUED LIABILITIES:
   Warranty                                                     $  2,010        $  1,490
   Commissions                                                     1,877           1,220
   Income taxes                                                      419               -
   Other                                                           1,291           1,017
                                                                --------        --------
         Total                                                  $  5,597        $  3,727
                                                                ========        ========
</TABLE>
<TABLE>
                                                                      Year Ended December 31,
                                                             --------------------------------------
                                                                1998            1997           1996
                                                             -------         -------        -------
<CAPTION>
<S>                                                          <C>             <C>            <C>
ALLOWANCE FOR DOUBTFUL ACCOUNTS:
   Balance, beginning of period                              $   360         $   533        $   204
   Provision for losses on accounts receivable                   324             175            450
   Accounts receivable written off, net of recoveries           (274)           (348)          (121)
                                                             -------         -------        -------
   Balance, end of period                                    $   410         $   360        $   533
                                                             =======         =======        =======
ALLOWANCE FOR EXCESS AND OBSOLETE INVENTORY:
     Balance, beginning of period                            $   150         $   130        $   150
     Provision for excess and obsolete inventories               200              20              -
     Inventories written off                                       -               -            (20)
                                                             -------         -------        -------
     Balance, end of period                                  $   350         $   150        $   130
                                                             =======         =======        =======
</TABLE>

2.  SUPPLEMENTAL CASH FLOW INFORMATION:

Interest  payments  of $1,017,  $682 and $813 were made  during the years  ended
December 31,  1998,  1997 and 1996,  respectively.  Payments for income taxes of
$2,914,  $912 and $652 were made during the years ended December 31, 1998,  1997
and 1996, respectively.

<PAGE 25>

3.  DEBT:

Long-term debt at December 31, consists of the following:
                                                            1998            1997
                                                            ----            ----
$15,150 bank line of credit, with interest
  payable monthly at LIBOR plus 1.70%
  (6.64% at December 31, 1998), due
  August 31, 2000, collateralized by accounts
  receivable and inventory.                            $   6,890       $  11,485

Bank note, payable in monthly installments
  of $3, through March 2000, plus interest
  at the bank's prime rate plus 1/4% (8% at
  December 31, 1998), collateralized by real estate.         250             287

Notes payable, due in 84 equal monthly
  installments  beginning in April 1998,
  with interest ranging from 5.6% to 7.52%
  at December 31, 1998, collateralized
  by machinery and equipment.                              4,597           1,260
                                                       ---------       ---------
                                                          11,737          13,032
Less- current maturities                                     757             175
                                                       ---------       ---------
                                                       $  10,980       $  12,857
                                                       =========       =========

Maturities  of  long-term  debt for each of the years ended  December 31, are as
follows:

            1999                                $     757
            2000                                    7,816
            2001                                      717
            2002                                      717
            2003                                      717
            Thereafter                              1,013
                                                ---------
                                                $  11,737
                                                =========

The revolving credit agreement  requires,  among other things,  that the Company
maintain a minimum tangible net worth,  working capital and debt to tangible net
worth ratio and it limits  capital  expenditures.  At  December  31,  1998,  the
Company was in compliance with the covenants of the revolving credit agreement.

Based on the borrowing rates  currently  available to the Company for bank loans
with similar terms and average maturities,  the fair value of the long-term debt
approximates the carrying value.

4.  INCOME TAXES:

The Company  accounts for income taxes as required by SFAS No. 109,  "Accounting
for Income Taxes." Under this method,  deferred tax  liabilities  and assets are
determined  based on the difference  between the financial  statement and income
tax basis of assets and liabilities using currently enacted tax rates.

<PAGE 26>

The income tax provision consists of the following:

                                                 Years Ended December 31,
                                       ----------------------------------------
                                           1998            1997            1996
                                       --------         -------        --------
         Current                       $  3,584         $   622        $  2,176
         Deferred                          (269)            427            (860)
                                       --------         -------        --------
                                       $  3,315         $ 1,049        $  1,316
                                       ========         =======        ========

The  reconciliation  of the federal  statutory  income tax rate to the effective
income tax rate is as follows:
        
                                                 Years Ended December 31,
                                             ---------------------------------
                                             1998          1997           1996
                                             ----          ----           ----
         Federal statutory rate                34%           34%            34%
         State income taxes                     5             -              5
         Employment credits                    (1)           (4)             -
         Other                                  1            (4)             -
                                               --            --             --
                                               39%           26%            39%
                                               ==            ==             ==

The tax effect of temporary  differences  giving rise to the Company's  deferred
income taxes at December 31 are as follows:
                                                            1998          1997
                                                            ----          ----
       Deferred tax assets -
         Valuation reserves                             $    552       $   197
         Warranty accrual                                    764           575
         Other accruals                                      222           291
         Other, net                                           56            21
                                                        --------       -------
                                                        $  1,594       $ 1,084
                                                        ========       =======
       Deferred tax liabilities -
         Depreciation and amortization                  $    283       $    41
                                                        ========       =======
5.  BENEFIT PLANS:

The Company  maintains a stock option plan for key  employees  and directors and
restricts  1,000,000  shares of common stock for issuance under the plan.  Under
the terms of this plan,  the exercise  price of shares  granted will not be less
than 85% of their fair market value at the date of the grant. The exercise price
of all  options  granted  was  equal to the  market  price at the date of grant.
Options  granted vest at a rate of 20% per year,  commencing one year after date
of grant,  and are  exercisable  for ten years.  At December 31,  1998,  133,125
shares were available for granting future options. The number and exercise price
of options granted were as follows:

                                              Number                 Price
                                            of Shares              Per Share
                                            ---------              ---------
OUTSTANDING AT JANUARY 1, 1996                276,650            $1.14-13.01
  Granted                                     207,125            $ 4.50-5.88
  Exercised                                   (15,125)                 $1.19
  Cancelled                                   (42,900)                $13.01
                                              -------            -----------
<PAGE 27>
                                              Number                 Price
                                            of Shares              Per Share
                                            ---------              ---------
OUTSTANDING AT DECEMBER 31, 1996              425,750             $1.14-5.88
  Granted                                     167,500             $5.25-7.19
  Exercised                                   (47,875)            $1.14-5.13
  Cancelled                                   (20,000)                 $5.13
                                              -------            -----------
OUTSTANDING AT DECEMBER 31, 1997              525,375             $1.14-7.19
  Granted                                     291,500            $7.63-11.25
  Exercised                                   (43,000)            $1.19-7.19
  Cancelled                                   (35,000)                 $7.63
                                              -------            -----------
OUTSTANDING AT DECEMBER 31, 1998              738,875            $1.14-11.25
                                              =======            ===========
EXERCISABLE AT DECEMBER 31, 1998              271,400            $ 1.14-7.19
                                              =======            ===========

The following is a summary of stock options outstanding as of December 31, 1998:
<TABLE>
                                       Options Outstanding                                 Options Exercisable
                       --------------------------------------------------------    -----------------------------------
                            Number              Weighted          Weighted              Number             Weighted
     Range of           Outstanding at          Average       Average Remaining     Exercisable at          Average
 Exercise Prices       December 31, 1998     Exercise Price    Contractual Life    December 31, 1998    Exercise Price
 ---------------       -----------------     --------------   -----------------    -----------------    --------------
<CAPTION>
<S><C>                      <C>                  <C>               <C>                  <C>                   <C>    
    $1.14-1.19              178,750              $  1.16           3.4                  178,750               $  1.16
    $4.50-7.63              477,625              $  6.62           8.9                   92,650               $  5.80
   $9.00-11.25               82,500              $  9.77           9.5                        -               $     -
</TABLE>

The Company applies the disclosure-only  provisions of SFAS 123, "Accounting for
Stock-Based Compensation." Accordingly, no compensation cost has been recognized
for the stock option plans. Had compensation cost for the Company's stock option
plans been determined  consistent with the provisions of SFAS 123, the Company's
net  income and  earnings  per share  would  have been  reduced to the pro forma
amounts indicated below:

                                                 1998         1997        1996
                                                 ----         ----        ----
       Net income:
         As reported                         $  5,230      $ 3,022     $ 2,075
         Pro forma                           $  4,949      $ 2,872     $ 2,004

       Basic earnings per share:
         As reported                         $    .84      $   .49     $   .34
         Pro forma                           $    .80      $   .47     $   .33

       Diluted earnings per share:
         As reported                         $    .82      $   .48     $   .33
         Pro forma                           $    .78      $   .46     $   .32

Because  the SFAS 123  method of  accounting  has not been  applied  to  options
granted prior to January 1, 1995, the resulting pro forma  compensation cost may
not be representative of that to be expected in future years.

<PAGE 28>

The fair value of each option  grant is estimated on the date of grant using the
Black-Scholes   option  pricing  model  with  the  following   weighted  average
assumptions:  dividend  yield of 0%;  expected  volatility  of 42.46% to 50.79%;
risk-free  interest rate of 4.38% to 6.98%;  and expected lives of four to eight
years.

The Company  sponsors a defined  contribution  benefit plan.  Employees can make
contributions  at a minimum  of 1% and a  maximum  of 15% of  compensation.  The
Company  may,  on  a  discretionary   basis,   contribute  a  Company   matching
contribution  not to  exceed  6% of  compensation.  The  Company  made  matching
contributions of $595, $159 and $97 in 1998, 1997 and 1996, respectively.

The  Company  maintains a profit  sharing  bonus plan under which 10% of pre-tax
profit is paid to  eligible  employees  on a  quarterly  basis.  Profit  sharing
expense was $902,  $509 and $303 for the years ended December 31, 1998, 1997 and
1996, respectively.

6.  SUBSEQUENT EVENT:

Subsequent  to December 31, 1998,  the Board of Directors  adopted a Stockholder
Rights Plan. The plan creates a dividend of one right for each outstanding share
of the Company's  common stock.  The rights are traded with the Company's common
stock. Generally, the rights become exercisable after a public announcement that
a person has acquired,  or a tender offer is made for, 20% or more of the common
stock of the Company.  If either of these events occur,  each right will entitle
the holder (other than a holder owning more than 20% of the  outstanding  stock)
to buy the number of shares of the Company's  common stock having a market value
two times the exercise price. The exercise price is $60.

The rights may be redeemed by the Company for $0.001 per right until a person or
group has acquired 20% of the Company's  common stock.  The  distribution of the
rights will be made to stockholders of record as of March 1, 1999.


<TABLE> <S> <C>

<ARTICLE>                     5
<LEGEND>
THIS  SCHEDULE  CONTAINS  SUMMARY  FINANCIAL   INFORMATION  EXTRACTED  FROM  THE
CONSOLIDATED  FINANCIAL  STATEMENTS OF AAON,  INC., AS OF AND FOR THE YEAR ENDED
DECEMBER  31,  1998,  AND IS  QUALIFIED  IN ITS  ENTIRETY BY  REFERENCE  TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   DEC-31-1998
<CASH>                                         25,000
<SECURITIES>                                   0
<RECEIVABLES>                                  18,343,000
<ALLOWANCES>                                   410,000
<INVENTORY>                                    12,160,000
<CURRENT-ASSETS>                               31,953,000
<PP&E>                                         31,231,000
<DEPRECIATION>                                 12,678,000
<TOTAL-ASSETS>                                 50,506,000
<CURRENT-LIABILITIES>                          14,832,000
<BONDS>                                        10,980,000
                          0
                                    0
<COMMON>                                       25,000
<OTHER-SE>                                     24,386,000
<TOTAL-LIABILITY-AND-EQUITY>                   50,506,000
<SALES>                                        106,781,000
<TOTAL-REVENUES>                               106,781,000
<CGS>                                          86,952,000
<TOTAL-COSTS>                                  97,578,000
<OTHER-EXPENSES>                               (359,000)
<LOSS-PROVISION>                               0
<INTEREST-EXPENSE>                             1,017,000
<INCOME-PRETAX>                                8,545,000
<INCOME-TAX>                                   3,315,000
<INCOME-CONTINUING>                            8,545,000
<DISCONTINUED>                                 0
<EXTRAORDINARY>                                0
<CHANGES>                                      0
<NET-INCOME>                                   5,230,000
<EPS-PRIMARY>                                  .84
<EPS-DILUTED>                                  .82
        

</TABLE>


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