ONEOK INC /NEW/
8-K, 1999-04-15
NATURAL GAS TRANSMISISON & DISTRIBUTION
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                    FORM 8-K


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



                                 April 15, 1999
                        (Date of earliest event reported)



                                  ONEOK, Inc.
             (Exact name of registrant as specified in its charter)



         Oklahoma                       1-2572                 73-1520922
(State or other jurisdiction        (Commission               (IRS Employer
       of incorporation)            File Number)            Identification No.)


                        100 West Fifth Street; Tulsa, OK
                    (Address of principal executive offices)


                                      74103
                                   (Zip code)


                                 (918) 588-7000
              (Registrant's telephone number, including area code)


                                 Not Applicable
          (Former name or former address, if changed since last report)


<PAGE>   2


Items 1-4                           Not applicable.

Item 5                              Other Events:
                                    
   
                                    This supercedes the 8-K filed on January 
                                    25, 1999 and amended on January 26, 1999.   

                                    Pursuant to the terms and conditions of a
                                    certain Agreement and Plan of Merger, dated
                                    December 14, 1998, among ONEOK, Inc., an
                                    Oklahoma corporation ("ONEOK"), Oasis
                                    Acquisition Corporation, a California
                                    corporation and newly formed subsidiary of
                                    ONEOK ("OAC"), and Southwest Gas
                                    Corporation, a California corporation
                                    ("Southwest"), Southwest will be merged into
                                    OAC with OAC as the surviving corporation.
                                    Immediately after that, OAC will be merged
                                    into ONEOK with ONEOK as the surviving
                                    corporation. The mergers are subject to
                                    approval by Southwest's shareholders, state
                                    regulatory agencies, and typical closing
                                    conditions. It is anticipated that the
                                    transactions can be closed later in 1999.
    

                                    In order for ONEOK to issue certain
                                    securities during the interim period, ONEOK
                                    must comply with Rule 3-05 and Rule
                                    11-01(a)(8) of Regulation S-X of the
                                    Securities and Exchange Commission with
                                    respect to disclosure of certain financial
                                    statements of the business acquired or to be
                                    acquired and pro forma financial information
                                    relating to the probable merger
                                    transactions. Therefore, ONEOK is filing as
                                    exhibits hereto certain financial
                                    information relating to Southwest and
                                    required pro forma financial information.

Item 6                              Not applicable.

Item 7                              Financial Statements, Pro Forma Financial
                                    Information and Exhibits


Exhibit No.:                        Description.

12                                  Included herein - Computation of Ratio of
                                    Earnings to Combined Fixed Charges and
                                    Preferred Stock Dividend Requirements

12.a                                Included herein - Computation of Ratio of
                                    Earnings to Fixed Charges

23.a                                Consent of Arthur Andersen LLP

99.a                                Included herein - Unaudited Pro Forma
                                    Combined Condensed Financial Statements

99.b                                Incorporated by Reference - ONEOK, Inc. Form
                                    10-Q for the Quarter ended February 28,
                                    1999, filed April 14, 1999

99.c                                Incorporated by Reference - Southwest Gas
                                    Corporation Form 10-K for the Year ended
                                    December 31, 1998, filed March 30, 1999

99.d                                Incorporated by Reference - Southwest Gas
                                    Corporation Form 10-Q for the Quarter ended
                                    June 30, 1998, filed August 14, 1998



<PAGE>   3


99.e                                Incorporated by Reference - Reports on Form
                                    8-K filed by Southwest Gas Corporation

                                    8-K filed February 11, 1999

Item 8                              Not applicable.


<PAGE>   4

                                    SIGNATURE


         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized, on this 15th of April, 1999.




                                               ONEOK, Inc.


                                        By:    Jim Kneale
                                               --------------------------------
                                               Vice President, Chief Financial
                                               Officer, and Treasurer


<PAGE>   5

THE PROPOSED MERGER

The Agreement provides that ONEOK will pay $28.50 per share for Southwest common
stock outstanding, including associated stock purchase rights. The transaction
is subject to customary conditions including approval from Southwest
shareholders and state regulators in Arizona, California, and Nevada. In
February, 1999, Southwest announced that it had received an unsolicited proposal
from Southern Union Company (Southern Union) offering to acquire Southwest for
$32.00 per share in cash. The proposal is preliminary in nature and subject to a
number of contingencies and uncertainties. Under the terms of the agreement with
ONEOK, as a result of certain preliminary determinations made by the Board of
Directors of Southwest, the Southwest Board has authorized management to
commence substantive discussions with Southern Union regarding its proposal. No
assurances can be given that any agreement will be reached with Southern Union.
The merger agreement with ONEOK remains in full force and effect.

Financing is expected to be provided through notes and trust preferred
securities. The trust preferred securities are expected to provide $250 million
while the notes are expected to provide the remainder of the financing with an
average term of eight years and a weighted average interest rate of 6.53
percent. Financing costs to be amortized are expected to be $7.7 million.

SOUTHWEST GAS CORPORATION

In August 1997, the Arizona Corporation Commission (ACC) approved a settlement
of a general rate application submitted by Southwest in November 1996 providing
Southwest with a $32 million general rate increase effective September 1997. The
settlement achieved a number of favorable rate design improvements and tariff
restructuring changes including consolidation of the southern and central
Arizona rate jurisdictions for ratemaking purposes and better matching of rates
with the costs of serving various customer classes.

During the three months ended December 31, 1997, Southwest recognized
nonrecurring charges to income related to cost overruns on two separate
construction projects. These charges are reflected in Other Expense. An $8
million pretax charge resulted from cost overruns experienced during expansion
of the northern California service territory. A second pretax charge, for $5
million, related to cost overruns on a nonutility construction project.
Partially offsetting these charges was the recognition of a $3.4 million income
tax benefit related to the successful settlement in November 1997 of open tax
issues dating back as far as 1988. The combined impact of these events was a
$4.1 million reduction to earnings.

<PAGE>   6

              UNAUDITED PRO FORMA COMBINED CONDENSED BALANCE SHEET
                                FEBRUARY 28, 1999
                                   (THOUSANDS)

<TABLE>
<CAPTION>
                                                                                                   PRO FORMA         COMBINED
                                                                    ONEOK        SOUTHWEST        ADJUSTMENTS         TOTAL
                                                                -----------      -----------      -----------        --------

<S>                                                             <C>              <C>              <C>               <C>
ASSETS
Property                                                        $ 2,680,361      $ 2,145,426                        $ 4,825,787
      Accumulated depreciation, depletion & amortization            945,461          612,138                          1,557,599
                                                                -----------      -----------      -----------       -----------
           Net property                                           1,734,900        1,533,288                          3,268,188
                                                                -----------      -----------      -----------       -----------
CURRENT ASSETS:
      Cash and cash equivalents                                      18,357           18,535                             36,892
      Accounts and notes receivable                                 332,214           88,037                            420,251
      Inventories                                                    84,016                0                             84,016
      Other                                                          22,907          140,814                            163,721
                                                                -----------      -----------      -----------       -----------
           Total current assets                                     457,494          247,386                            704,880
                                                                -----------      -----------      -----------       -----------
Deferred Charges and Other Assets:
      Regulatory assets, net                                        250,318           37,299                            287,617
      Goodwill                                                       78,106            8,911           (8,911) (b)       78,106
      Excess charges to be allocated                                      0                           442,741  (b)      442,741
      Other                                                         175,968            3,810            7,710  (a)      187,488
                                                                -----------      -----------      -----------       -----------
           Total deferred charges and other assets                  504,392           50,020          441,540           995,952
                                                                -----------      -----------      -----------       -----------
                  TOTAL ASSETS                                  $ 2,696,786      $ 1,830,694      $   441,540       $ 4,969,020
                                                                ===========      ===========      ===========       ===========

LIABILITIES AND SHAREHOLDERS' EQUITY
COMMON SHAREHOLDERS' EQUITY
      Common stock                                              $       317      $    32,040      $   (32,040) (b)          317
      Premium on capital stock                                      331,820          424,840         (424,840) (b)      331,820
      Retained earnings                                             315,360           19,520          (19,520) (b)      315,360
                                                                -----------      -----------      -----------       -----------
           Total common shareholders' equity                        647,497          476,400         (476,400)          647,497
      Convertible preferred stock:  series A                            199                                                 199
      Convertible preferred stock:  series B                              1                                                   1
      Premium on preferred stock                                    568,869                                             568,869
                                                                -----------      -----------      -----------       -----------
           Total shareholders' equity                             1,216,566          476,400         (476,400)        1,216,566
Long-term debt, excluding current portion                           529,720          812,906          667,940  (a)    2,010,566
Trust preferred securities of ONEOK subsidiary                            0                0          250,000  (a)      250,000
Redeemable preferred securities of Southwest Gas Capital I                0           60,000                             60,000
                                                                -----------      -----------      -----------       -----------
      Total capitalization                                        1,746,286        1,349,306          441,540         3,537,132
                                                                -----------      -----------      -----------       -----------
CURRENT LIABILITIES:
      Long-term debt                                                 19,817            5,270                             25,087
      Notes payable                                                 160,000           52,000                            212,000
      Accounts payable                                              178,170           64,295                            242,465
      Accrued taxes                                                  38,084           33,480                             71,564
      Accrued interest                                                8,624           13,872                             22,496
      Other                                                          56,735           81,877                            138,612
                                                                -----------      -----------      -----------       -----------
           Total current liabilities                                461,430          250,794                            712,224
                                                                -----------      -----------      -----------       -----------
DEFERRED CREDITS AND OTHER LIABILITIES:
      Deferred income taxes                                         310,136          179,666                            489,802
      Other deferred credits                                        178,934           50,928                            229,862
                                                                -----------      -----------      -----------       -----------
           Total deferred credits and other liabilities             489,070          230,594                            719,664
                                                                -----------      -----------      -----------       -----------
                  TOTAL LIABILITIES & SHAREHOLDERS' EQUITY      $ 2,696,786      $ 1,830,694      $   441,540       $ 4,969,020
                                                                ===========      ===========      ===========       ===========
</TABLE>




See accompanying Notes to Unaudited Pro Forma Combined Condensed Financial
Statements


<PAGE>   7

                UNAUDITED PRO FORMA COMBINED STATEMENT OF INCOME

                       SIX MONTHS ENDED FEBRUARY 28, 1999
                  (Amounts in thousands, except per share data)


<TABLE>
<CAPTION>
                                                                                                 PRO FORMA            COMBINED
                                                             ONEOK            SOUTHWEST         ADJUSTMENTS            TOTAL
                                                          -----------        -----------        -----------         -----------

<S>                                                       <C>                <C>               <C>                  <C>
OPERATING REVENUES
     Regulated                                            $   583,716        $   360,217                            $   943,933
     Nonregulated                                             388,877             71,594                                460,471
                                                          -----------        -----------        -----------         -----------
          Total operating revenues                            972,593            431,811                              1,404,404
                                                          -----------        -----------        -----------         -----------
OPERATING EXPENSES
     Cost of gas                                              603,124            135,094                                738,218 
     Operations and maintenance                               126,860            169,409                                296,269
     Depreciation, depletion and amortization                  62,935             45,762              5,534  (b)        114,231
     Other expense, net                                             0              1,928                                  1,928
     General taxes                                             19,545             15,829                                 35,374
                                                          -----------        -----------        -----------         -----------
          Total operating expenses                            812,464            368,022              5,534           1,186,020
                                                          -----------        -----------        -----------         -----------
Income before interest, income taxes and preferred
     securities distributions                                 160,129             63,789             (5,534)            218,384
Income taxes                                                   53,983             15,419            (12,312) (g)         57,090
Interest                                                       23,364             31,535             21,808  (c)         77,056
                                                                                                        349  (e)
Preferred securities distribution                                                  2,737              9,375  (d)         12,148
                                                                                                         36  (f)
                                                          -----------        -----------        -----------         -----------
NET INCOME                                                     82,782             14,098            (24,790)             72,090
Preferred stock dividends                                      18,648                                                    18,648
                                                          -----------        -----------        -----------         -----------
     Income available for common stock                    $    64,134        $    14,098        $   (24,790)        $    53,442
                                                          ===========        ===========        ===========         ===========

Weighted average shares outstanding - basic                    31,564                                                    31,564
                                                          ===========        ===========        ===========         ===========
Weighted average shares outstanding - diluted                  51,667                                                    51,667
                                                          ===========        ===========        ===========         ===========
Earnings per share of common stock - basic                $      2.03                                               $      1.69
                                                          ===========        ===========        ===========         ===========
Earnings per share of common stock - diluted              $      1.60                                               $      1.40
                                                          ===========        ===========        ===========         ===========
</TABLE>


See accompanying Notes to Unaudited Pro Forma Combined Condensed Financial
Statements



<PAGE>   8

                UNAUDITED PRO FORMA COMBINED STATEMENT OF INCOME

                           YEAR ENDED AUGUST 31, 1998
                  (Amounts in thousands, except per share data)



<TABLE>
<CAPTION>
                                                                                                 PRO FORMA            COMBINED
                                                             ONEOK            SOUTHWEST         ADJUSTMENTS            TOTAL
                                                          -----------        -----------        -----------         -----------

<S>                                                       <C>                <C>               <C>                  <C>
OPERATING REVENUES
     Regulated                                            $   971,905        $   734,741                            $ 1,706,646
     Nonregulated                                             863,497            110,598                                974,095
                                                          -----------        -----------        -----------         -----------
           Total operating revenues                         1,835,402            845,339                              2,680,741
                                                          -----------        -----------        -----------         -----------
OPERATING EXPENSES
     Cost of gas                                            1,220,009            282,771                              1,502,780
     Operations and maintenance                               277,068            302,512                                579,580
     Depreciation, depletion and amortization                 101,653             86,776             11,068  (b)        199,497
     Other expense, net                                             0             11,560                                 11,560
     General taxes                                             33,217             30,099                                 63,316
                                                          -----------        -----------        -----------         -----------
           Total operating expenses                         1,631,947            713,718             11,068           2,356,733
                                                          -----------        -----------        -----------         -----------
Income before interest, income taxes and preferred
     securities distributions                                 203,455            131,621            (11,068)            324,008
Income taxes                                                   66,585             20,268            (24,623) (g)         62,230
Interest                                                       35,075             64,790             43,616  (c)        144,179
                                                                                                        698  (e)
Preferred securities distribution                                   0              5,475             18,750  (d)         24,296
                                                                                                         71  (f)
                                                          -----------        -----------        -----------         -----------
NET INCOME                                                    101,795             41,088            (49,580)             93,303
Preferred stock dividends                                      26,979                  0                                 26,979
                                                          -----------        -----------        -----------         -----------
     Income available for common stock                    $    74,816        $    41,088        $   (49,580)        $    66,324
                                                          ===========        ===========        ===========         ===========

Weighted average shares outstanding - basic                    30,674                                                    30,674
                                                          ===========        ===========        ===========         ===========
Weighted average shares outstanding - diluted                  45,729                                                    45,729
                                                          ===========        ===========        ===========         ===========
Earnings per share of common stock - basic                $      2.44                                               $      2.16
                                                          ===========        ===========        ===========         ===========
Earnings per share of common stock - diluted              $      2.23                                               $      2.04
                                                          ===========        ===========        ===========         ===========
</TABLE>


During the three months ended December 31, 1997, Southwest recognized
nonrecurring charges to income related to cost overruns on two separate
construction projects. These charges are reflected in Other Expense. An $8
million pretax charge resulted from cost overruns experienced during expansion
of the northern California service territory. A second pretax charge, for $5
million, related to cost overruns on a nonutility construction project.
Partially offsetting these charges was the recognition of a $3.4 million income
tax benefit related to the successful settlement in November 1997 of open tax
issues dating back as far as 1988. The combined impact of these events was a
$4.1 million reduction to earnings.


See accompanying Notes to Unaudited Pro Forma Combined Condensed Financial
Statements

<PAGE>   9
                UNAUDITED PRO FORMA COMBINED STATEMENT OF INCOME

                      TWELVE MONTHS ENDED FEBRUARY 28, 1999
                  (Amounts in thousands, except per share data)



<TABLE>
<CAPTION>
                                                                                                 PRO FORMA            COMBINED
                                                             ONEOK            SOUTHWEST         ADJUSTMENTS            TOTAL
                                                          -----------        -----------        -----------         -----------

<S>                                                       <C>                <C>               <C>                  <C>
OPERATING REVENUES
      Regulated                                           $   966,670        $   799,597                           $ 1,766,267
      Nonregulated                                            805,111            117,712                               922,823
                                                          -----------        -----------         -----------       -----------
            Total operating revenues                        1,771,781            917,309                             2,689,090
                                                          -----------        -----------         -----------       -----------
OPERATING EXPENSES
      Cost of gas                                           1,139,156            329,849                             1,469,005
      Operations and maintenance                              271,293            312,840                               584,133
      Depreciation, depletion and amortization                120,129             88,804              11,068 (b)       220,001
      Other expense, net                                                           1,390                                 1,390
      General taxes                                            37,354             31,646                                69,000
                                                          -----------        -----------         -----------       -----------
            Total operating expenses                        1,567,932            764,529              11,068         2,343,529
                                                          -----------        -----------         -----------       -----------
Income before interest, income taxes and preferred
      securities distributions                                203,849            152,780             (11,068)          345,561
Income taxes                                                   66,519             36,414             (24,623)(g)        78,310
Interest                                                       39,109             63,354              43,616 (c)       146,777
                                                                                                         698 (e)
Preferred securities distribution                                                  5,475              18,750 (d)        24,296
                                                                                                          71 (f)
                                                          -----------        -----------         -----------       -----------
NET INCOME                                                     98,221             47,537             (49,580)           96,178
Preferred stock dividends                                      36,651                                                   36,651
                                                          -----------        -----------         -----------       -----------
      Income available for common stock                   $    61,570        $    47,537         $   (49,580)      $    59,527
                                                          ===========        ===========         ===========       ===========
Weighted average shares outstanding - basic                    31,562                                                   31,562
                                                          ===========        ===========         ===========       ===========
Weighted average shares outstanding - diluted                  50,798                                (19,236)(h)        31,562
                                                          ===========        ===========         ===========       ===========
Earnings per share of common stock - basic                $      1.95                                              $      1.89
                                                          ===========        ===========         ===========       ===========
Earnings per share of common stock - diluted              $      1.93                                              $      1.89
                                                          ===========        ===========         ===========       ===========
</TABLE>



See accompanying Notes to Unaudited Pro Forma Combined Condensed Financial
Statements


<PAGE>   10

      NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS

The pro forma adjustments have been made to the Unaudited Pro Forma Combined
Condensed Financial Statements to reflect the following:

(a)      To record the financing required to pay the $28.50 per share cash
         consideration to Southwest shareholders pursuant to the Agreement and
         related costs (thousands, except per share data)

<TABLE>
<S>  <C>      <C>                                                                    <C> 
Total Consideration:
     Shares of common stock of Southwest outstanding                                       30,410
      Per share consideration                                                           $   28.50
                                                                                        ---------
              Total consideration                                                       $ 866,685


Plus:
Financing costs                                                                             7,710
Transaction costs                                                                          43,545
                                                                                        ---------
              Total acquisition financing required                                      $ 917,940
              Less trust preferred securities                                             250,000
                                                                                        ---------
              Anticipated debt                                                          $ 667,940
                                                                                        =========
</TABLE>

(b)      The excess of the total purchase price over the allocation of fair
         value to the net assets is the excess costs to be allocated. The
         calculation of excess costs to be allocated is based on the following
         assumptions and calculations (thousands):

<TABLE>
<S>  <C>                                                                              <C>
Total Consideration                                                                     $ 866,685
Transaction Costs                                                                          43,545
                                                                                        ---------
     Total purchase price                                                                 910,230
Estimated net tangible asset book value at February 28, 1999                              467,489
                                                                                        ---------
     Excess costs to be allocated related to proposed merger                            $ 442,741
                                                                                        =========

Amortization of excess costs (assumes a 40 year life):
     Adjustment to amortization expense for the fiscal year 1998
        and the twelve months ended February 28, 1999                                   $  11,068
     Adjustment to amortization expense for the six months
        ended February 28, 1999                                                         $   5,534
</TABLE>

(c)      Interest expense adjustments as a result of the anticipated debt are as
         follows (thousands):

<TABLE>
<S>                                                                                     <C>
     Total anticipated debt--see note (a)                                               $ 667,940
     Assumed weighted average interest rate on  debt                                         6.53%
                                                                                        ---------
     Interest expense adjustment for fiscal 1998 and the twelve months
         ended February 28, 1999                                                        $  43,616
                                                                                        =========

     Interest expense adjustment for the six months ended
        February 28, 1999                                                               $  21,808
                                                                                        =========
</TABLE>


The assumed weighted-average interest rate reflects current market rates;
however, actual rates will reflect interest rates at or about closing of the
Proposed Merger and, thus, are subject to change prior to closing. For every 1/8
percent change in the interest rate, interest expense for the fiscal year 1998,
the twelve months ended February 28, 1999, and the six months ended February 28,
1999, would change by $835 thousand, $835 thousand, and $417 thousand,
respectively.


<PAGE>   11


(d)      Preferred securities distribution adjustments as a result of the trust
         preferred securities are as follows (thousands):

<TABLE>
<S>                                                                                     <C>
     Total trust preferred securities--see note (a)                                     $ 250,000
     Assumed distribution rate                                                                7.5%
                                                                                        ---------
     Preferred securities distribution adjustment for fiscal 1998 and the
        twelve months ended February 28, 1999                                           $  18,750
                                                                                        =========
     Preferred securities distribution adjustment for the six months ended
        February 28, 1999                                                               $   9,375
                                                                                        =========
</TABLE>

The assumed distribution rate reflects current market rates; however, actual
rates will reflect distribution rates at or about closing of the Proposed Merger
and, thus, are subject to change prior to closing. For every 1/8 percent change
in the distribution rate, distribution expense for the fiscal year 1998, for the
twelve months ended February 28, 1999 and for the six months ended February 28,
1999, would change by $313 thousand, $313 thousand, and $156 thousand,
respectively.

(e)      To record amortization expense of the debt issuance costs of the notes
         over the 8-year average life of the notes. Amortization expense for
         fiscal year 1998, the twelve months ended February 28, 1999, and the
         six months ended February 28, 1999, would be $698 thousand, $698
         thousand, and $349 thousand respectively.

(f)      To record amortization expense of the issuance costs of the trust
         preferred securities over the 30-year life of the securities.
         Amortization expense for fiscal year 1998, the twelve months ended
         February 28, 1999, and the six months ended February 28, 1999 would be
         $71 thousand, $71 thousand, and $36 thousand respectively.

(g)      Represents the tax effect at the statutory rate of all pre-tax pro
         forma adjustments after excluding nondeductible goodwill amortization.
         The Company intends to structure the trust preferred securities to
         allow the Company to take the position that the trust preferred
         securities should be classified for United States federal income tax
         purposes as indebtedness. No assurance can be given that such position
         will not be challenged by the Internal Revenue Service or, if
         challenged, that such a challenge will not be successful.

(h)      Represents elimination of dilutive securities in EPS computation. On a
         pro forma basis, such securities are antidilutive.

<PAGE>   12
                               Index to Exhibits

Exhibit No.:                        Description.

12                                  Included herein - Computation of Ratio of
                                    Earnings to Combined Fixed Charges and
                                    Preferred Stock Dividend Requirements

12.a                                Included herein - Computation of Ratio of
                                    Earnings to Fixed Charges

23.a                                Consent of Arthur Andersen LLP

99.a                                Included herein - Unaudited Pro Forma
                                    Combined Condensed Financial Statements

99.b                                Incorporated by Reference - ONEOK, Inc. Form
                                    10-Q for the Quarter ended February 28,
                                    1999, filed April 14, 1999

99.c                                Incorporated by Reference - Southwest Gas
                                    Corporation Form 10-K for the Year ended
                                    December 31, 1998, filed March 30, 1999

99.d                                Incorporated by Reference - Southwest Gas
                                    Corporation Form 10-Q for the Quarter ended
                                    June 30, 1998, filed August 14, 1998

99.e                                Incorporated by Reference - Reports on Form 
                                    8-K filed by Southwest Gas Corporation



<PAGE>   1

                                                                    EXHIBIT (12)

                                   ONEOK, Inc.
           Computation of Ratio of Earnings to Combined Fixed Charges
                    and Preferred Stock Dividend Requirements


<TABLE>
<CAPTION>
                                                Six Months                          Years Ended August 31, 
                                                   Ended         -------------------------------------------------------------
                                               Feb. 28, 1999        1998         1997         1996         1995         1994  
                                               -------------        ----         ----         ----         ----         ----  
                                                                                                                           
<S>                                            <C>               <C>         <C>         <C>         <C>         <C>     
Fixed charges, as defined
     Interest on long-term debt                  $  17,354       $  30,846    $  31,354    $  31,748    $  32,345    $  32,979
     Other interest                                  5,506           3,723        3,376        3,184        4,934        1,855
     Amortization of debt issue costs                  504             506          518          530          512          525
     Interest on lease agreements                    1,162           2,325        2,266        2,266        2,266        2,266
                                                 ---------       ---------    ---------    ---------    ---------    ---------
          Total fixed charges                       24,526          37,400       37,514       37,728       40,057       37,625
                                                                                                                              
Preferred dividend requirements                     30,570          44,228          285          428          428          428
                                                 ---------       ---------    ---------    ---------    ---------    ---------
                                                                                                                              
Total fixed charges and preferred                                                                                             
     dividend requirements                       $  55,096       $  81,628    $  37,799    $  38,156    $  40,485    $  38,053
                                                 =========       =========    =========    =========    =========    =========
                                                                                                                              
                                                                                                                              
Earnings before income taxes                     $ 136,765       $ 168,380    $  94,107    $  85,873    $  68,146    $  57,276
                                                                                                                              
Total fixed charges                                 24,526          37,400       37,514       37,728       40,057       37,625
                                                 ---------       ---------    ---------    ---------    ---------    ---------
                                                                                                                              
Earnings available for combined                                                                                               
     fixed charges and preferred                                                                                              
     dividend requirements                       $ 161,291       $ 205,780    $ 131,621    $ 123,601    $ 108,203    $  94,901
                                                 =========       =========    =========    =========    =========    =========
                                                                                                                              
Ratio of earnings to combined                                                                                                 
     fixed charges and preferred                                                                                              
     dividend requirements                           2.93X           2.52X        3.48X        3.24X        2.67X        2.49X
                                                 =========       =========    =========    =========    =========    =========
</TABLE>


      Pro Forma Computation of Ratio of Earnings to Combined Fixed Charges
         and Preferred Stock Dividend Requirements Giving Effect to the
                       Proposed Merger as Discussed Herein


<TABLE>
<CAPTION>
                                                 Six Months     Year Ended
                                                   Ended         August 31,
                                               Feb. 28, 1999       1998
                                               -------------    -----------

<S>                                              <C>             <C>
Fixed charges, as defined
     Interest on long-term debt                  $  70,697       $ 139,252
     Other interest                                  5,506           3,723
     Amortization of debt issue costs                  889           1,275
     Preferred securities distributions                                   
          of subsidiary                             12,112          24,225
     Interest on lease agreements                    1,162           2,325
                                                 ---------       ---------
          Total fixed charges                       90,366         170,800
                                                                          
Preferred dividend requirements                     30,570          44,228
                                                 ---------       ---------
                                                                          
Total fixed charges and preferred                                         
     dividend requirements                       $ 120,936       $ 215,028
                                                 =========       =========
                                                                          
Earnings before income taxes                     $ 129,180       $ 155,533
                                                                          
Total fixed charges                                 90,366         170,800
                                                 ---------       ---------
                                                                          
Earnings available for combined                                           
     fixed charges and preferred                                          
     dividend requirements                       $ 219,546       $ 326,333
                                                 =========       =========
                                                                          
Ratio of earnings to combined                                             
     fixed charges and preferred                                          
     dividend requirements                           1.82X           1.52X
                                                 =========       =========
</TABLE>

For purposes of computing the ratio of earnings to combined fixed charges and
preferred dividend requirements, "earnings" consists of net income plus fixed
charges and income taxes. "Fixed charges" consists of interest charges, the
amortization of debt issue costs, preferred securities distributions of
subsidiary, and the representative interest portion of operating leases.
"Preferred dividend requirements" consists of the pre-tax preferred dividend
requirement.


<PAGE>   1

                                                                 EXHIBIT (12)(a)

                                   ONEOK, Inc.
                Computation of Ratio of Earnings to Fixed Charges


<TABLE>
<CAPTION>
                                            Six Months                          Years Ended August 31,
                                              Ended          ---------------------------------------------------------------
                                           Feb. 28, 1999        1998         1997         1996         1995         1994
                                           -------------        ----         ----         ----         ----         ----

<S>                                         <C>              <C>          <C>          <C>          <C>          <C> 
Fixed charges, as defined
    Interest on long-term debt              $  17,354        $  30,846    $  31,354    $  31,748    $  32,345    $  32,979
    Other interest                              5,506            3,723        3,376        3,184        4,934        1,855
    Amortization of debt issue costs              504              506          518          530          512          525
    Interest on lease agreements                1,162            2,325        2,266        2,266        2,266        2,266
                                            ---------        ---------    ---------    ---------    ---------    ---------
         Total fixed charges                   24,526           37,400       37,514       37,728       40,057       37,625
                                                                                                                          
Earnings before income taxes                $ 136,765        $ 168,380    $  94,107    $  85,873    $  68,146    $  57,276
                                            ---------        ---------    ---------    ---------    ---------    ---------
                                                                                                                          
Earnings available for fixed charges        $ 161,291        $ 205,780    $ 131,621    $ 123,601    $ 108,203    $  94,901
                                            =========        =========    =========    =========    =========    =========

Ratio of earnings to fixed charges              6.58X            5.50X        3.51X        3.28X        2.70X        2.52X
                                            =========        =========    =========    =========    =========    =========
</TABLE>


           Pro Forma Computation of Ratio of Earnings to Fixed Charges
            Giving Effect to the Proposed Merger as Discussed Herein


<TABLE>
<CAPTION>
                                                 Six Months         Year Ended
                                                   Ended            August 31,
                                               Feb. 28, 1999           1,998
                                               -------------        -----------

<S>                                              <C>                <C>
Fixed charges, as defined
     Interest on long-term debt                  $  70,697          $ 139,252
     Other interest                                  5,506              3,723
     Amortization of debt issue costs                  889              1,275
     Preferred securities distributions                                      
          of subsidiary                             12,112             24,225
     Interest on lease agreements                    1,162              2,325
                                                 ---------          ---------
          Total fixed charges                       90,366            170,800
                                                                             
Earnings before income taxes                     $ 129,180          $ 155,533
                                                 ---------          ---------
                                                                             
Earnings available for fixed charges             $ 219,546          $ 326,333
                                                 =========          =========
                                                                             
Ratio of earnings to fixed charges (a)               2.43X              1.91X
                                                 =========          =========
</TABLE>


For purposes of computing the ratio of earnings to combined fixed charges and
preferred dividend requirements, "earnings" consists of net income plus fixed
charges and income taxes. "Fixed charges" consists of interest charges, the
amortization of debt issue costs, preferred securities distributions of
subsidiary, and the representative interest portion of operating leases.



<PAGE>   1

                                                                    EXHIBIt 23.a


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent public accountants, we hereby consent to the incorporation of our
report, dated March 26, 1999, incorporated by reference in Southwest Gas
Corporation's Annual Report on Form 10-K for the year ended December 31, 1998,
incorporated by reference in this Form 8-K into ONEOK, Inc.'s previously filed
Registration Statement File No.'s 333-41265, 333-41267, 333-41263, 333-41269,
333-44915 and 333-57433.

                                               /s/ Arthur Andersen LLP

Las Vegas, Nevada
April 15, 1999


<PAGE>   1

                                                                    EXHIBIT 99.A


           UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS

The following unaudited pro forma financial statements give effect to the
proposed merger of Southwest Gas Corporation (Southwest) into ONEOK, Inc.
(ONEOK) (the Proposed Merger) as described in the Agreement and Plan of Proposed
Merger (the Agreement) incorporated by reference herein. The Proposed Merger
will be treated as a purchase for accounting purposes. The assets acquired and
the liabilities assumed will be recorded at their fair values. The Proposed
Merger is subject to customary conditions including approval from Southwest
shareholders and state regulators in Arizona, California, and Nevada. The merger
is expected to close later in 1999.

The fiscal year of ONEOK and Southwest ends on August 31 and December 31,
respectively, and, accordingly, the accompanying unaudited pro forma combined
condensed financial statements have been prepared using previously filed
financial statements of ONEOK combined with comparable financial statement
periods of Southwest. The unaudited pro forma condensed balance sheet as of
February 28, 1999, is presented as if the Proposed Merger had occurred on that
date using the Southwest balance sheet at December 31, 1998. The unaudited pro
forma combined condensed statements of income (loss) for the fiscal year ended
August 31, 1998, and the six and twelve month periods ended February 28, 1999,
assume that the Proposed Merger occurred at the beginning of the earliest period
presented and include the comparable twelve months ended June 30, 1998, and the
six and twelve month periods ended December 31, 1998, respectively, for
Southwest. The pro forma condensed statement of income for the twelve months
ended February 28, 1999, has been presented as management believes that it is
more representative of normal operations given the significance of the general
rate increase granted to Southwest effective September 1997 in Arizona and the
inclusion for a full twelve month period of the gas business of Western
Resources, Inc., which was acquired by ONEOK effective December 1, 1997.

The unaudited pro forma combined condensed financial statements should be read
in conjunction with the historical financial statements of ONEOK and Southwest
and "Management's Discussion and Analysis of Financial Condition and Results of
Operations" of ONEOK and Southwest. The unaudited pro forma combined condensed
financial statements do not purport to represent what ONEOK's financial position
or results of operations would actually have been if the Proposed Merger had
been consummated on the indicated dates, nor are they necessarily indicative of
ONEOK's financial position or results of operations for any future period. The
results of operations for the six months ended February 28, 1999, are not
necessarily indicative of the results to be expected for the entire fiscal year
or any other interim period.

The pro forma adjustments are based on preliminary assumptions and estimates
made by ONEOK management. The information necessary to account for the Proposed
Merger in accordance with generally accepted accounting principles is incomplete
at this time. In addition, the outcome of regulatory approval may impact the
allocation of the consideration to be paid for Southwest in the Proposed Merger.
Accordingly, the pro forma combined condensed financial statements assume that
the recorded amounts of Southwest's assets and liabilities approximate their
fair values. The actual allocation of the consideration paid for Southwest may
differ from that reflected in the unaudited pro forma combined condensed
financial statements after a more extensive review of the fair values of the
assets acquired and liabilities assumed has been completed. Accordingly, the
allocation of the purchase price and the resultant amortization of the excess
cost, which are based on preliminary estimates, may differ from the final
purchase price allocation and amortization periods.




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