1

                                  Exhibit 99.1

                          INDEX TO FINANCIAL STATEMENTS



                                                                          Page
                                                                          ----

Input / Output, Inc. Employee Stock Purchase Plan

        Independent Auditors' Report ...................................  F-2

        Statements of Net Assets Available for Plan Benefits
        as of June 30, 2000 and 1999 ...................................  F-3

        Statements of Changes in Net Assets Available for
        Plan Benefits for the years ended June 30, 2000, 1999
        and 1998 .......................................................  F-3

        Notes to Financial Statements ..................................  F-4
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                          INDEPENDENT AUDITORS' REPORT


Compensation Committee of the Board of Directors
Input / Output, Inc.

We have audited the accompanying statements of net assets available for plan
benefits of the Input / Output, Inc. Employee Stock Purchase Plan as of June 30,
2000 and 1999 and the related statements of changes in net assets available for
plan benefits for the years ended June 30, 2000, 1999 and 1998. These financial
statements are the responsibility of the Plan's management. Our responsibility
is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States of America. 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 net assets available for plan benefits of the Input /
Output, Inc. Employee Stock Purchase Plan as of June 30, 2000 and 1999 and the
changes in net assets available for plan benefits for the years ended June 30,
2000, 1999 and 1998 in conformity with accounting principles generally accepted
in the United States of America.


                                                              /s/  KPMG LLP
                                                              -------------

Houston, Texas
September 22, 2000
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                 INPUT/OUTPUT, INC. EMPLOYEE STOCK PURCHASE PLAN
              STATEMENTS OF NET ASSETS AVAILABLE FOR PLAN BENEFITS
                                      AS OF

                                                               June 30,
                                                       -------------------------
                                                         2000            1999
                                                       ----------     ----------
                       Assets
                       ------

Cash ...............................................   $   --         $  347,810

Investments in shares of Input / Output, Inc.
  Common Stock at fair value .......................   $2,987,605     $1,211,807
                                                       ----------     ----------

Net Assets available for plan benefits .............   $2,987,605     $1,559,617
                                                       ==========     ==========


                 INPUT/OUTPUT, INC. EMPLOYEE STOCK PURCHASE PLAN
         STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS
                               FOR THE YEARS ENDED



                                                                       June 30,
                                                       ----------------------------------------
                                                          2000           1999           1998
                                                       -----------    -----------    ----------
                                                                            
Additions to assets:
   Employee contributions ..........................   $ 1,051,382    $ 1,152,387    $  995,544
   Net appreciation (depreciation) in fair
     value of Input / Output, Inc. Common Stock ....       753,915       (140,610)      109,473
   Net realized gain (loss) on sales and
     distributions of Input / Output, Inc. Common
     Stock .........................................        (4,172)       (12,906)      209,471

Total additions ....................................     1,801,125        998,871     1,314,488
                                                       -----------    -----------    ----------

Deductions:
   Distributions to participants ...................       373,137        461,732       542,702
                                                       -----------    -----------    ----------

Change in net assets available for plan benefits
  during the year ..................................   $ 1,427,988    $   537,139    $  771,786
                                                       ===========    ===========    ==========

Net Assets available for plan benefits:
   At beginning of period ..........................   $ 1,559,617    $ 1,022,478    $  250,692
                                                       ===========    ===========    ==========

   At end of period ................................   $ 2,987,605    $ 1,559,617    $1,022,478
                                                       ===========    ===========    ==========


                 See accompanying notes to financial statements.
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                 INPUT/OUTPUT, INC. EMPLOYEE STOCK PURCHASE PLAN

                          NOTES TO FINANCIAL STATEMENTS


(1)      DESCRIPTION OF PLAN:

         The following brief description of the Input / Output, Inc. Employee
   Stock Purchase Plan ("the Purchase Plan") is provided for general information
   purposes only. Participants should refer to the Purchase Plan for complete
   information regarding the Purchase Plan's definitions, benefits, eligibility
   and other matters.

   (a)   General

         The Purchase Plan was approved by the Input/Output, Inc. (the Company)
   Board of Directors in March, 1997 and commenced on April 1, 1997. The
   stockholders of the Company approved the Purchase Plan on September 29, 1997.
   There are 1.5 million shares of Common Stock of the Company reserved for
   issuance under the Purchase Plan.

         The Purchase Plan is intended to advance the long-term interests of the
   Company by encouraging the acquisition and ownership of common stock of the
   Company by employees of the Company. The Purchase Plan is intended to qualify
   as an "employee stock purchase plan" under Section 423 of the Internal
   Revenue Code (the Code) of 1986, as amended.

         Effective April 1, 1999, the Purchase Plan was amended to reduce the
   period of continuous employment required for participation in the plan.

         Effective October 1, 1999, the Purchase Plan was amended for the
   following reasons: (1) to shift the offering periods to coincide to the
   calendar year, (2) to allow for the purchase of fractional shares utilizing
   all of the funds in a participant's account and (3) to clarify that all
   Input / Output, Inc. subsidiary employees are eligible to participate in the
   plan.

   (b)   Eligibility

         An "eligible employee" under the Purchase Plan is a person who (i) is
   actively employed (ii) is actively employed on the first day of the offering
   period and (iii) is not excluded pursuant to the following sentence. The
   following person shall not be eligible: (1) employees whose customary
   employment is twenty (20) hours or less per week, and (2) an employee who
   owns 5% or more of the Company's Common Stock.

   (c)   Contributions

         The Purchase Plan allows all eligible employees to authorize payroll
   deductions at the rate of 1% up to 15% of base compensation to be applied
   toward the purchase of Input / Output, Inc. Common Stock. The purchase price
   of the Common Stock will be the lesser of 85% of the closing price on the
   first day of the applicable offering period or most recently preceding
   trading day or 85% of the closing price on the last day of the offering
   period or most recently preceding trading day. Under the Purchase Plan,
   separate six-month offering periods ("offering period") commence on January
   1st and July 1st of each year.
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                 INPUT/OUTPUT, INC. EMPLOYEE STOCK PURCHASE PLAN

                   NOTES TO FINANCIAL STATEMENTS - (CONTINUED)


   (d) Participant Accounts

         A Purchase Plan account in the name of each participant will be
   maintained. Each pay day a participant's payroll deduction shall be withheld
   and credited to such account. As of the last day of the Offering Period the
   amount in the participant's account shall be applied to the purchase of the
   Company's Common Stock. The purchase of stock will be made solely from
   amounts credited to the participant's plan account. The total number of
   employees participating in the purchase plan as of June 30, 2000, 1999 and
   1998 was 519, 428 and 401, respectively.

   (e)   Distributions

         Upon withdrawing from an offering, terminating employment or
   terminating their participation in the Plan, the Plan Administrator will
   transfer to the participant a stock certificate of the shares of Common Stock
   in such participant's plan account or, alternatively, the participant may
   request in writing the sale of all or part of the shares of Common Stock in
   such participant's plan account. The shares will be sold within five business
   days, and the Purchase Plan will deliver to the participant the proceeds of
   the sale, less a handling charge, brokerage commissions, and other costs of
   sale.

(2)      SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

         The financial statements of the Plan are presented on the accrual basis
   of accounting in conformity with accounting principles generally accepted in
   the United States of America.

         Investments in Company Common Stock are reported at fair value
   determined by reference to quoted market prices. Net realized gains and
   losses on disposition of investments are reported on the revalued cost
   method. Revalued cost is the fair value of the assets at the beginning of the
   Plan year or historical cost if the investment was acquired since the
   beginning of the year. Any unrealized appreciation or depreciation is
   recognized as a gain or loss currently in the statement of changes in net
   assets available for plan benefits.

(3)      FEDERAL INCOME TAXES

         The Purchase Plan and the right of participants to make purchases
   thereunder are intended to qualify under the provisions of Section 423 of the
   Code. Under those provisions, no income will be taxable to a participant at
   the time of the grant of the option or purchase of shares for federal income
   tax purposes. However, a participant may become liable for tax upon
   dispositions of shares acquired, and the tax consequences will depend on how
   long a participant has held the shares prior to disposition.

(4)      ADMINISTRATION OF PLAN ASSETS

         The Purchase Plan's investment in shares of Input / Output, Inc. Common
   Stock are held in safekeeping as designated by Computershare Investor
   Services, L.L.C. formerly Harris Trust, Inc. ("Registrar"). Cash
   contributions to the Purchase Plan are held by the Company prior to the
   investment in Input / Output, Inc. Common Stock. Certain administrative
   functions are performed by officers or employees of the Company or Registrar.
   No such officers or employees receive compensation from the Purchase Plan.
   All administrative expenses of the Purchase Plan are borne by the Company.
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                 INPUT/OUTPUT, INC. EMPLOYEE STOCK PURCHASE PLAN

                  NOTES TO FINANCIAL STATEMENTS - (CONTINUED)


(5)      PLAN TERMINATION

         The Purchase Plan will terminate (a) on the date all shares authorized
   for sale under the Purchase Plan have been purchased or (b) at any time, at
   the discretion of the Board of Directors of the Company; provided however,
   that no termination shall affect outstanding offerings of shares.

         Upon termination of the Purchase Plan and the exercise or lapse of all
   offering rights thereunder all remaining amounts credited to the Purchase
   Plan accounts of participants shall be returned to such participants in cash
   without interest. At this time, there is no intention to terminate the
   Purchase Plan.

(6)      INVESTMENTS

         The investments, at June 30, 2000 and 1999 are presented in the
   following table:

                                                              June 30,
                                                        2000             1999
                                                     ----------       ----------
         Shares of Input / Output, Inc. Common Stock

         Number of shares .......................       353,432          160,239
                                                     ==========       ==========
         Average cost ...........................    $2,233,690       $1,352,417
                                                     ==========       ==========
         Fair value .............................    $2,987,605       $1,211,807
                                                     ==========       ==========