INPUT OUTPUT INC
S-8, 1997-03-28
MEASURING & CONTROLLING DEVICES, NEC
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<PAGE>

  As filed with the Securities and Exchange Commission on March 28, 1997.

                                               REGISTRATION NO. 333-_______

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

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C.  20549

                                   -----------

                                    FORM S-8
              REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                                   -----------

                                INPUT/OUTPUT, INC.
           (Exact name of registrant as specified in its charter)

                DELAWARE                                22-2286646
      (State or other jurisdiction                   (I.R.S. Employer
    of incorporation or organization)               Identification Number)

                           11104 WEST AIRPORT BOULEVARD
                               STAFFORD, TEXAS 77477
                                   (281) 933-3339
   (Address, including zip code, and telephone number, including area code,
                    of registrant's principal executive offices)

                                   -----------
                    
                    INPUT/OUTPUT, INC. EMPLOYEE STOCK PURCHASE PLAN
                               (Full Title of Plan)

                                   GARY D. OWENS
                                 INPUT/OUTPUT, INC.
                             11104 WEST AIRPORT BOULEVARD
                                STAFFORD, TEXAS 77477
                                    (281) 933-3339
           (Name, address, including zip code, and telephone number, 
                    including area code, of agent for service)


                                   WITH COPIES TO:
                              HAYNES AND BOONE, L.L.P.
                             1000 LOUISIANA, SUITE 4300
                               HOUSTON, TEXAS  77002
                              ATTN:  MARC H. FOLLADORI
                                   (713) 547-2000

                                   -----------
                    
                          CALCULATION OF REGISTRATION FEE

<TABLE>
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
                                                                PROPOSED         
                                                                MAXIMUM       PROPOSED MAXIMUM    AMOUNT OF
            TITLE OF                         AMOUNT TO BE    OFFERING PRICE  AGGREGATE OFFERING  REGISTRATION
   SECURITIES TO BE REGISTERED             REGISTERED(1)(2)   PER SHARE(2)        PRICE(2)           FEE 
- --------------------------------------------------------------------------------------------------------------
<S>                                           <C>               <C>              <C>                <C>
Common Stock, par value $0.01 per share       1,500,000         $15.4375         $23,156,250        $7,018
- --------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------
</TABLE>

(1) Pursuant to Rule 416(a), also registered hereunder is an indeterminate 
    number of shares of Common Stock issuable as a result of the anti-dilution 
    provisions of the Input/Output, Inc. Employee Stock Purchase Plan (the 
    "Plan").  In addition, pursuant to Rule 416(c), under the Securities Act of
    1933, this Registration Statement also covers an indeterminate amount of 
    interests to be offered or sold pursuant to the employee benefit plan 
    described herein.

(2) The 1,500,000 shares registered hereby represent shares issuable pursuant 
    to the Plan.  With respect to the shares registered hereby, the offering 
    price per share, the aggregate offering price and the registration fee have 
    been calculated in accordance with paragraphs (c) and (h)(1) of Rule 457 on 
    the basis of the average high and low sale prices for the Company's Common 
    Stock on March 21, 1997, as reported on the New York Stock Exchange 
    composite tape ($15.4375 per share).
<PAGE>

                                    PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

   The contents of the following documents filed by Input/Output, Inc., a 
Delaware corporation (the "Company"), and the Plan with the Securities and 
Exchange Commission (the "Commission") are incorporated into this 
registration statement ("Registration Statement") by reference:

   (a) The Company's Annual Report, dated July 12, 1996, as filed with the 
Commission on Form 10-K, File No. 1-13402, for the fiscal year ended May 31, 
1996;

   (b) All other reports filed pursuant to Section 13(a) or 15(d) of the 
Securities Exchange Act of 1934, as amended (the "Exchange Act"), since May 
31, 1996; and

   (c) The description of the Company's common stock, par value $0.01 per 
share (the "Common Stock"), contained in the Company's registration statement 
on Form 8-A filed under Section 12(b) of the Exchange Act dated October 14, 
1994.

   All documents filed by the Company and the Plan with the Commission 
pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act 
subsequent to the filing date of this Registration Statement and prior to the 
filing of a post-effective amendment to this Registration Statement which 
indicates that all securities offered have been sold or which deregisters all 
securities then remaining unsold shall be deemed to be incorporated by 
reference in this Registration Statement and to be a part hereof from the 
date of filing such documents. 

ITEM 4. DESCRIPTION OF SECURITIES.

   Not applicable.

ITEM 5. INTERESTS OF NAMED EXPERTS AND COUNSEL.

   Not applicable.

ITEM 6. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

   Section 145 of the Delaware General Corporation Law permits a corporation 
to indemnify any person who was or is a party or is threatened to be made a 
party to any threatened, pending or completed action, suit or proceeding, 
whether civil, criminal, administrative or investigative, by reason of the 
fact that he is or was a director, officer, employee or agent of the 
corporation or is or was serving at the request of the corporation as a 
director, officer, employee or agent of another corporation, partnership, 
joint venture, trust or other enterprise, against expenses, judgments, fines 
and amounts paid in settlement actually and reasonably incurred by him in 
connection with such action.

   In an action brought to obtain a judgment in the corporation's favor, 
whether by the corporation itself or derivatively by a stockholder, the 
corporation may only indemnify for expenses, including attorney's fees, 
actually and reasonably incurred in connection with the defense or settlement 
of such action, and the corporation may not indemnify for amounts paid in 
satisfaction of a judgment or in settlement of the claim.  In any such 
action, no indemnification may be paid in respect of any claim, issue or 
matter as to which such person shall have been adjudged liable to the 

                                     -2-
<PAGE>

corporation except as otherwise approved by the Delaware Court of Chancery or 
the court in which the claim was brought.  In any other type of proceeding, 
the indemnification may extend to judgments, fines and amounts paid in 
settlement, actually and reasonably incurred in connection with such other 
proceeding, as well as to expenses.

   The statute does not permit indemnification unless the person seeking 
indemnification has acted in good faith and in a manner reasonably believed 
to be in, or not opposed to, the best interests of the corporation and, in 
the case of criminal actions or proceedings, the person had no reasonable 
cause to believe his conduct was unlawful.  The statute contains additional 
limitations applicable to criminal actions and to actions brought by or in 
the name of the corporation.  The determination as to whether a person 
seeking indemnification has met the required standard of conduct is to be 
made (1) by a majority vote of the disinterested directors, even though less 
than a quorum, (2) if there are no disinterested directors or if the 
disinterested directors so direct, by independent legal counsel in a written 
opinion, or (3) by the stockholders.

   The Company's Bylaws require the Company to indemnify its directors, 
officers, employees, and agents to the fullest extent permitted under 
Delaware law.  The Company's Certificate of Incorporation provides that a 
director of the corporation shall not be held personally liable to the 
corporation or its shareholders for monetary damages for breach of a 
director's fiduciary duty of care, except that a director shall continue to 
be held personally liable for (i) breach of the duty of loyalty, (ii) failure 
to act in good faith, (iii) engaging in intentional misconduct or knowingly 
violating a law, (iv) paying a dividend or approving a stock repurchase which 
was illegal under Delaware law, or (v) obtaining an improper personal benefit.

   The Company has purchased insurance on behalf of its directors and 
officers against certain liabilities that may be asserted against, or 
incurred by, such persons in their capacities as directors or officers of the 
registrant, or that may arise out of their status as directors or officers of 
the registrant, including liabilities under the federal and state securities 
laws.

ITEM 7. EXEMPTION FROM REGISTRATION CLAIMED.

   Not applicable.

ITEM 8. EXHIBITS.

Exhibit                       Description
- -------                       -----------
  4.1     Amended and Restated Certificate of Incorporation, filed as 
          Exhibit 3.1 to the Company's Annual Report on Form 10-K for the 
          fiscal year ended May 31, 1995 and incorporated herein by 
          reference.

  4.2     Amended and Restated Bylaws, filed as Exhibit 3.2 to the Company's 
          Annual Report on Form 10-K for the fiscal year ended May 31, 1995 
          and incorporated herein by reference.

  4.3     Specimen certificate for shares of the Company's common stock, par 
          value $0.01 per share. Exhibit F to the Company's Registration 
          Statement on Form 8-A dated October 14, 1994, is incorporated 
          herein by reference.

  4.4     The Company's Employee Stock Purchase Plan.

                                       -3-
<PAGE>

Exhibit                      Description
- -------                      ------------
  5.1     Opinion of Haynes and Boone, L.L.P.

 23.1     Consent of KPMG Peat Marwick LLP.

 23.2     Consent of Haynes and Boone, L.L.P. (included in Exhibit 5.1 opinion).

 24.1     Power of Attorney (included on the signature page hereto).


ITEM 9. UNDERTAKINGS.

     A. UNDERTAKING TO UPDATE

        The undersigned registrant hereby undertakes:

            (1)  To file, during any period in which offers or sales are being 
        made, a post-effective amendment to this registration statement:

                (i)  To include any prospectus required by section 10(a)(3) 
            of the Securities Act of 1933;

                (ii) To reflect in the prospectus any facts or events 
            arising after the effective date of the registration statement 
            (or the most recent post-effective amendment thereof) which, 
            individually or in the aggregate, represent a fundamental change
            in the information set forth in the registration statement;

                (iii)  To include any material information with respect to 
            the plan of distribution not previously disclosed in the 
            registration statement or any material change to such 
            information in the registration statement;

        PROVIDED, HOWEVER, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply
        if the information required to be included in a post-effective 
        amendment by those paragraphs is contained in periodic reports 
        filed by the registrant pursuant to Section 13 or Section 15(d) of 
        the Securities Exchange Act of 1934 that are incorporated by 
        reference in the registration statement.

            (2)  That, for the purpose of determining any liability under the 
        Securities Act of 1933, each such post-effective amendment shall be 
        deemed to be a new registration statement relating to the 
        securities offered therein, and the offering of such securities at 
        that time shall be deemed to be the initial bona fide offering 
        thereof.

            (3)  To remove from registration by means of a post-effective 
        amendment any of the securities being registered which remain 
        unsold at the termination of the offering.

     B. UNDERTAKING WITH RESPECT TO DOCUMENTS INCORPORATED BY REFERENCE

        The undersigned registrant hereby undertakes that, for purposes of 
        determining any liability under the Securities Act of 1933, each 
        filing of the registrant's annual report 

                                      -4-
<PAGE>

        pursuant to Section 13(a) or Section 15(d) of the Securities 
        Exchange Act of 1934 and each filing of the Plan's annual report 
        pursuant to Section 15(d) of the Securities Exchange Act of 1934 
        that is incorporated by reference in the registration statement 
        shall be deemed to be a new registration statement relating to the 
        securities offered therein, and the offering of such securities at 
        that time shall be deemed to be the initial bona fide offering 
        thereof.

     C. UNDERTAKING WITH RESPECT TO INDEMNIFICATION

        Insofar as indemnification for liabilities arising under the 
        Securities Act of 1933 may be permitted to directors, officers and 
        controlling persons of the registrant pursuant to the foregoing 
        provisions, or otherwise, the registrant has been advised that in 
        the opinion of the Securities and Exchange Commission such 
        indemnification is against public policy as expressed in the Act 
        and is, therefore, unenforceable.  In the event that a claim for 
        indemnification against such liabilities (other than the payment by 
        the registrant of expenses incurred or paid by a director, officer 
        or controlling person of the registrant in the successful defense 
        of any action, suit or proceeding) is asserted by such director, 
        officer or controlling person in connection with the securities 
        being registered, the registrant will, unless in the opinion of its 
        counsel the matter has been settled by controlling precedent, 
        submit to a court of appropriate jurisdiction the question whether 
        such indemnification by it is against public policy as expressed in 
        the Act and will be governed by the final adjudication of such 
        issue.

                                          -5-
<PAGE>

                                       SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, the Registrant 
certifies that it has reasonable grounds to believe that it meets all the 
requirements for filing on Form S-8 and has duly caused this Registration 
Statement to be signed on its behalf by the undersigned, thereunto duly 
authorized in the City of Stafford, State of Texas, on March 27, 1997.

                                   INPUT/OUTPUT, INC.


                                   By:       /s/ Robert P. Brindley  
                                       ------------------------------------
                                               Robert P. Brindley
                                          Senior Vice President, Chief 
                                         Financial Officer and Secretary
                                          (Principal Financial Officer)

                              POWER OF ATTORNEY

   Each of the undersigned hereby appoints Gary D. Owens and Robert P. 
Brindley and each of them (with full power to act alone), as attorney and 
agents for the undersigned, with full power of substitution, for and in the 
name, place and stead of the undersigned, to sign and file with the 
Securities and Exchange Commission under the Securities Act of 1933 any and 
all amendments and exhibits to this Registration Statement and any and all 
applications, instruments and other documents to be filed with the Securities 
and Exchange Commission pertaining to the registration of the securities 
covered hereby, with full power and authority to do and perform any and all 
acts and things whatsoever requisite or desirable.

   Pursuant to the requirements of the Securities Act of 1933, this 
Registration Statement has been signed by the following persons in the 
capacities indicated on March 27, 1997.

           SIGNATURE                                   TITLE
           ---------                                   -----
/s/ Charles E. Selecman
- ---------------------------------  Director, Chairman of the Board of Directors
Charles E. Selecman


/s/ Gary D. Owens
- ---------------------------------  Director, President and
Gary D. Owens                           Chief Executive Officer
                                        (Principal Executive Officer)

/s/ Robert P. Brindley
- ---------------------------------  Director, Senior Vice President, Chief 
Robert P. Brindley                      Financial Officer and Secretary 
                                        (Principal Financial and Accounting 
                                        Officer)

/s/ Michael J. Sheen
- ---------------------------------  Director, Senior Vice President and Chief
Michael J. Sheen                        Technical Officer

/s/ Shelby H. Carter, Jr.
- ---------------------------------  Director
Shelby H. Carter, Jr.


/s/ Ernest E. Cook             
- ---------------------------------  Director
Ernest E. Cook


/s/ Glen H. Denison
- ---------------------------------  Director
Glen H. Denison


/s/ Theodore H. Elliott, Jr.
- ---------------------------------  Director
Theodore H. Elliott, Jr.


/s/ Dr. Peter T. Flawn
- ---------------------------------  Director
Dr. Peter T. Flawn


/s/ G. Thomas Graves III
- ---------------------------------  Director
G. Thomas Graves III
<PAGE>

   Pursuant to the requirements of the Securities Act of 1933, the 
Input/Output, Inc. Employee Stock Purchase Plan Committee, the administrator 
of the Plan, has duly caused this Registration Statement to be signed on its 
behalf by the undersigned, thereunto duly authorized in the City of Stafford, 
State of Texas, on March 27, 1997.

                           INPUT/OUTPUT, INC. EMPLOYEE STOCK PURCHASE PLAN


                           By:  Input/Output, Inc. Employee Stock Purchase 
                                Plan Committee


                           /s/ Robert P. Brindley 
                           --------------------------------------------------
                           Robert P. Brindley, Member of Plan Committee


                           /s/ G. Thomas Grisham 
                           --------------------------------------------------
                           G. Thomas Grisham,  Member of Plan Committee


                           /s/ Lacey C. Rice 
                           --------------------------------------------------
                           Lacey C. Rice,  Member of Plan Committee
<PAGE>

                               INDEX TO EXHIBITS

Exhibit                              Description
- -------                              -----------
 4.1      Amended and Restated Certificate of Incorporation, filed as Exhibit 
          3.1 to the Company's Annual Report on Form 10-K for the fiscal year 
          ended May 31, 1995 and incorporated herein by reference.

 4.2      Amended and Restated Bylaws, filed as Exhibit 3.2 to the Company's 
          Annual Report on Form 10-K for the fiscal year ended May 31, 1995 
          and incorporated herein by reference.

 4.3      Specimen certificate for shares of the Company's common stock, par 
          value $0.01 per share.  Exhibit F to the Company's Registration 
          Statement on Form 8-A dated October 14, 1994, is incorporated 
          herein by reference.

 4.4      The Company's Employee Stock Purchase Plan.

 5.1      Opinion of Haynes and Boone, L.L.P.

23.1      Consent of KPMG Peat Marwick, LLP.

23.2      Consent of Haynes and Boone, L.L.P. (included in Exhibit 5.1 
          opinion).

24.1      Power of Attorney (included on the signature page hereto).


<PAGE>

                             Exhibit 4.4                           




                        INPUT/OUTPUT, INC.
                   EMPLOYEE STOCK PURCHASE PLAN

<PAGE>

                        TABLE OF CONTENTS

                                                             PAGE
                                                             ----
1.   SHARES OFFERED. . . . . . . . . . . . . . . . . . . . . .  1

2.   ADMINISTRATION. . . . . . . . . . . . . . . . . . . . . .  1

3.   OFFERINGS . . . . . . . . . . . . . . . . . . . . . . . .  2

4.   ELIGIBILITY . . . . . . . . . . . . . . . . . . . . . . .  2

5.   OFFERING RIGHTS . . . . . . . . . . . . . . . . . . . . .  3

6.   PARTICIPATION; PAYROLL DEDUCTIONS . . . . . . . . . . . .  3

7.   PARTICIPANTS' PLAN ACCOUNTS . . . . . . . . . . . . . . .  3

8.   PAYROLL DEDUCTION CHANGES . . . . . . . . . . . . . . . .  4

9.   NO INTEREST . . . . . . . . . . . . . . . . . . . . . . .  4

10.  PURCHASE PRICE AND PURCHASE OF SHARES . . . . . . . . . .  4

11.  TERMINATION OF EMPLOYMENT; TERMINATION OF ELIGIBILITY . .  5

12.  WITHDRAWAL FROM OFFERING. . . . . . . . . . . . . . . . .  5

13.  STOCK CERTIFICATES. . . . . . . . . . . . . . . . . . . .  5

14.  SALE OF SHARES OF COMMON STOCK. . . . . . . . . . . . . .  6

15.  VOTING OF SHARES OF COMMON STOCK. . . . . . . . . . . . .  6

16.  TENDER OF EXCHANGE OFFER. . . . . . . . . . . . . . . . .  6

17.  STOCK DIVIDENDS AND SPLITS. . . . . . . . . . . . . . . .  7

18.  STATEMENTS. . . . . . . . . . . . . . . . . . . . . . . .  7

19.  NO RIGHTS AS A STOCKHOLDER. . . . . . . . . . . . . . . .  7

20.  RIGHTS NOT TRANSFERABLE . . . . . . . . . . . . . . . . .  7

                                    i
<PAGE>

21.  APPLICATION OF FUNDS. . . . . . . . . . . . . . . . . . .  8

22.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION. . . . . . . .  8

23.  AMENDMENTS OF THE PLAN. . . . . . . . . . . . . . . . . .  8

24.  TERMINATION OF THE PLAN . . . . . . . . . . . . . . . . .  8

25.  ALLOCATION OF SHARES IF EXCEED MAXIMUM OFFERED. . . . . .  8

26.  GOVERNMENTAL AND OTHER REGULATIONS. . . . . . . . . . . .  9

27.  APPROVAL OF STOCKHOLDERS. . . . . . . . . . . . . . . . .  9

28.  $25,000 LIMITATION. . . . . . . . . . . . . . . . . . . .  9

29.  INDEMNIFICATION . . . . . . . . . . . . . . . . . . . . .  9

30.  INVESTMENT INTENT . . . . . . . . . . . . . . . . . . . . 10

31.  NO RIGHT TO CONTINUE EMPLOYMENT . . . . . . . . . . . . . 10

32.  GOVERNING LAW . . . . . . . . . . . . . . . . . . . . . . 10

33.  CONSTRUCTION OF PLAN. . . . . . . . . . . . . . . . . . . 10

                                  ii
<PAGE>

                        INPUT/OUTPUT, INC.
                   EMPLOYEE STOCK PURCHASE PLAN

     This Plan is intended to advance the long-range interests of 
Input/Output, Inc., a Delaware corporation (the "Company"), by encouraging 
the acquisition and ownership of capital stock of the Company ("Common 
Stock"), upon the terms herein set forth, by employees of the Company and 
certain of its subsidiaries, in order that their proprietary interest in the 
Company's long-term performance and success, and their continuance as 
employees of the Company, may be enhanced.  The Plan is also intended to 
provide employees with an opportunity to acquire a proprietary interest in 
the Company through the purchase of shares of the Common Stock of the 
Company.  This Plan shall be known as the "Input/Output, Inc. Employee Stock 
Purchase Plan."  The Plan is intended to qualify as an "employee stock 
purchase plan" under Section 423 of the Internal Revenue Code of 1986, as 
amended (the "Code").  The provisions of the Plan shall be construed in a 
manner consistent with requirements of Section 423 of the Code.

     1.   SHARES OFFERED.  The total number of shares of Common Stock ($.01 
par value) available for purchase by Participants under all Offerings 
(defined in Section 3 below) is 1,500,000 SHARES, which are either authorized 
but unissued Common Stock or Common Stock held by the Company in its 
treasury.  If any Offering shall expire without all shares available under 
such Offering having been purchased, such unpurchased shares shall be added 
to the shares otherwise available for future Offerings.

     2.   ADMINISTRATION.  The Plan shall be administered by a committee (the 
"Plan Committee") appointed by the compensation committee of the Board of 
Directors (the "Compensation Committee"), which Plan Committee shall consist 
of not less than three members.  Subject to the express provisions of the 
Plan, the Plan Committee shall have authority, in its discretion, to 
interpret and construe any and all provisions of the Plan, to adopt rules and 
regulations for administering the Plan, and to make all other determinations 
necessary or advisable for administering the Plan.  The Plan Committee's 
determination on the foregoing matters shall be conclusive.  The Plan 
Committee shall have the power to appoint and remove an independent third 
party (which may, but need not, be a bank or trust company) to act as 
administrator of the Plan and custodian of all stock certificates issued 
under the Plan, and to provide such other services as the Plan Committee may 
determine (the "Administrator"), and the Plan Committee is authorized to 
enter into an agreement with the Administrator concerning its duties under 
the Plan.

     The Compensation Committee may from time to time appoint members of the 
Plan Committee in substitution for or in addition to members previously 
appointed, and may fill vacancies, however caused, in the Plan Committee.  
The Plan Committee may select one of its members as its Chairman and shall 
hold its meetings at such 

<PAGE>

times and places as it shall deem advisable, and may hold telephonic 
meetings.  A majority of its members shall constitute a quorum.  All 
determinations of the Plan Committee shall be made by a  majority of its 
members.  The Plan Committee may correct any defect or omission, or reconcile 
any inconsistency in the Plan, in the manner and to the extent it shall deem 
desirable.  Any decision or determination reduced to writing and signed by a 
majority of the members of the Plan Committee shall be as fully effective as 
if it had been made by a majority vote at a meeting duly called and held.  
The Plan Committee may appoint a secretary and shall make such rules and 
regulations for the conduct of its business as it shall deem advisable.

     3.   OFFERINGS.  The Plan Committee shall make an offering to Eligible 
Employees (defined in Section 4 below) to purchase Common Stock under the 
Plan (each an "Offering") during the six-month periods from April 1 through 
September 30 and from October 1 through March 31, until this Plan terminates; 
each such six-month offering period during which any such Offering is open is 
referred to herein as an "Offering Period."  The April 1 or October 1 which 
is the first day of an Offering Period is the "Offering Date" for such 
Offering Period.  For each Offering Period, payroll deductions of 
Participants for all payroll periods which end during the Offering Period 
(including a payroll period which ends on the last day of an Offering Period) 
shall be considered Payroll Deductions during such Offering Period and shall 
be used to purchase Common Stock at the end of the Offering Period in 
accordance with Section 7 below.  Unless otherwise specified by the Plan 
Committee, the number of shares of Common Stock that may be purchased under 
an Offering shall be the balance of the 1,500,000 shares authorized in 
Section 1 above which have not been previously purchased under the terms of 
this Plan. 

     4.   ELIGIBILITY.  The Compensation Committee shall designate the 
subsidiaries of the Company whose employees are eligible to participate in 
the Plan ("Participating Subsidiaries").

     An "Eligible Employee" is a person who (i) is actively employed by the 
Company or one of the Participating Subsidiaries, (ii) is actively employed 
on the first day of the calendar month prior to an Offering Period, and (iii) 
is not excluded pursuant to the following sentence. The following persons 
shall not be Eligible Employees:  (1) employees whose customary employment 
with the Company and all Participating Subsidiaries is twenty (20) hours or 
less per week, (2) employees who have not been employed by the Company or a 
Participating Subsidiary for at least six (6) consecutive months, and (3) an 
employee who owns capital stock of the Company (including all capital stock 
which may be purchased under outstanding Offerings under the Plan or 
outstanding options under any stock plan of the Company) possessing 5% or 
more of the total combined voting power or value of all classes of capital 
stock of the Company or of its subsidiary corporations (for the foregoing 
purposes, the rules of Section 425(d) of the Code shall apply in determining 
stock ownership), as provided in Code Section 423(b)(3). All Eligible 
Employees may

                                     2
<PAGE>

participate in the Plan.   A person shall be considered actively employed 
when the person is presently performing his/her regular duties with the 
Company or a Participating Subsidiary.  A person's period of employment with 
a company acquired by the Company or by one of its subsidiaries shall be 
included in determining an employee's length of employment for the purpose of 
this paragraph, provided that such acquired company is a Participating 
Subsidiary on the Offering Date.  A person who is a director but not an 
employee shall not be eligible under the Plan.

     5.   OFFERING RIGHTS.  With respect to each Offering, each Eligible 
Employee may elect to participate by having a portion of his Compensation 
(defined in Section 6 below) withheld and applied to the purchase of shares 
of Common Stock at the end of the Offering Period.  The amount withheld from 
each paycheck issued to the Eligible Employee during the Offering Period is 
the Participant's "Payroll Deduction" (in accordance with Section 6 below), 
and the Plan Committee shall apply such Payroll Deductions during an Offering 
Period to the purchase of the Company's Common Stock at the end of the 
Offering Period in accordance with Section 7 below.  In no event may the 
number of shares of Common Stock which may be purchased by all Participants 
for an Offering exceed the number of shares available during the Offering 
Period (as determined in accordance with Section 3 above). 

     6.   PARTICIPATION; PAYROLL DEDUCTIONS.  An Eligible Employee who 
completes and delivers an authorization for Payroll Deduction on the form 
provided by the Plan Committee ("Payroll Deduction Authorization Form") shall 
become a participant in the Plan ("Participant").  A Participant may deliver 
a Payroll Deduction Authorization Form to the Chief Financial Officer of the 
Company prior to the Offering Date of an Offering Period, and in accordance 
with the rules developed by the Plan Committee.  On his Payroll Deduction 
Authorization Form, the Participant shall elect to have deductions made on 
each payday which may be any whole percentage FROM 1% UP TO AND INCLUDING 15% 
of the Participant's Compensation in effect at the beginning of the Offering 
Period. "Compensation" shall mean W-2 compensation, including overtime but 
excluding commissions, bonuses and other special payments.  A Participant who 
elects to participate for an Offering Period through Payroll Deduction shall 
be deemed to have elected to participate in the Plan on the same basis for 
each successive Offering Period until such Participant changes his Payroll 
Deduction in accordance with Section 8 below or withdraws (or is deemed to 
withdraw) from an Offering pursuant to Section 12 below.  A Participant shall 
not be required to file additional Payroll Deduction Authorization Forms for 
successive Offering Periods in order to continue participation in the Plan.

     7.   PARTICIPANTS' PLAN ACCOUNTS.  The Plan Committee will maintain, or 
cause to have maintained, a Plan Account in the name of each Participant.  On 
each payday, a Participant's Payroll Deduction shall be withheld and credited 
to such Participant's Plan Account.  As of the last day of the Offering 
Period or such other date as designated by the Plan Committee if required for 
proper administration of the 

                                      3
<PAGE>

Plan ("Purchase Date"), the amount then in such Participant's Plan Account 
shall be applied to the purchase of shares in accordance with Section 10 
below; provided, however, that the first Purchase Date after the adoption of 
the Plan may be delayed pursuant to Section 27 below.  The purchase of shares 
shall be made solely from amounts credited to the Participants' Plan Accounts.

     8.   PAYROLL DEDUCTION CHANGES.  Except in the case of a withdrawal 
under Section 12 below, a Participant may not change his Payroll Deduction 
during an Offering Period.  A Participant may, however, decrease or increase 
his Payroll Deduction for a subsequent Offering Period prior to the 
commencement of the next Offering Period, by filing a new Payroll Deduction 
Authorization Form with the Chief Financial Officer of the Company during the 
time specified by the Plan Committee.

     9.   NO INTEREST.  The Plan Committee shall not credit a Participant's 
Plan Account with interest on any Payroll Deduction, except as provided in 
Section 27 below.

     10.  PURCHASE PRICE AND PURCHASE OF SHARES.  Subject to Section 28 
below, the purchase price for a share of Common Stock under any Offering will 
be the lesser of:

          (a)  85% of the closing sale price for shares of Common Stock
     as reported by the composite transaction reporting system for
     securities listed on the New York Stock Exchange on the Offering Date
     for such Offering or on the most recently preceding date on which
     there was such a sale (the "Initial Offering Price"); or

          (b)  85% of the closing sale price for shares of Common Stock
     as reported by the composite transaction reporting system for
     securities listed on the New York Stock Exchange on the last day of the
     Offering Period or on the most recently preceding date on which
     there was such a sale (the "Alternate Offering Price").

     As of the Purchase Date, the Alternate Offering Price shall be 
ascertained. The Plan Committee will then apply all funds credited to the 
Participants' Plan Accounts to purchase shares of Common Stock available 
under the Offering. Unless a Participant has withdrawn prior to the Purchase 
Date pursuant to Section 12, and subject to the provisions of Sections 25 and 
28, a Participant shall be deemed to have elected to purchase the maximum 
number of whole shares of Common Stock which may be purchased with the amount 
credited to his Plan Account as of the Purchase Date at the lower of the 
Initial Offering Price or the Alternate Offering Price. Fractional shares 
will not be issued under the Plan and any funds in a Participant's Plan 
Account which would have been used to purchase fractional shares shall be 
retained in such Plan Account for the next Offering Period.

                                    4
<PAGE>

     11.  TERMINATION OF EMPLOYMENT; TERMINATION OF ELIGIBILITY.  In the 
event of a Participant's termination of employment for any reason (including 
death or disability), the Participant's participation in the Plan shall 
immediately terminate without notice to the Participant, and all Payroll 
Deductions credited to such Participant's Plan Account shall be returned to 
such Participant in cash, without interest.  

     An Eligible Employee of a company included in the Plan which ceases to 
be a Participating Subsidiary shall be deemed to have terminated employment 
for purposes of this Section as of the date such company ceases to be a 
Participating Subsidiary unless, as of such date, the Participant shall 
become an Eligible Employee of the Company or of any Participating Subsidiary 
then included in the Plan.

     12.  WITHDRAWAL FROM OFFERING. Each Participant shall have the right, at 
any time prior to the Purchase Date, to withdraw from an Offering by 
providing fifteen (15) days' prior written notice to the Chief Financial 
Officer of the Company revoking his Payroll Deduction.  A Participant who 
elects to cease participation in the Plan by revoking his Payroll Deduction 
may not resume participation in the Plan until after the expiration of one 
full Offering Period following the Offering Period in which he withdraws and 
ceases participation.  As promptly as practicable after the receipt of a 
revocation notice, all Payroll Deductions credited to such Participant's Plan 
Account shall be returned to such Participant in cash, without interest.

     13.  STOCK CERTIFICATES.  As promptly as practicable after the Purchase 
Date of each Offering, the Plan Committee will deliver to the Administrator 
all shares of Common Stock purchased with the funds credited to the Plan 
Accounts. The Administrator will hold the shares of Common Stock of all 
Participants in its name or in the name of its nominee evidenced by as many 
or as few certificates as the Administrator determines.  No certificate 
representing shares of Common Stock purchased for a Participant's Plan 
Account will be issued to the Participant unless he or she makes a request in 
writing or until his or her Plan Account is terminated, or such Participant 
withdraws from an Offering. So long as the stock credited to a Participant's 
Plan Account is held by the Administrator, all rights accruing to an owner of 
record of such stock, including, without limitation, voting rights and rights 
of disposal, shall belong to the Participant for whose account such stock is 
held. 

     A Participant may elect, at any time and from time to time, to receive a 
stock certificate for shares credited to his Plan Account after the purchase 
price for such shares has been paid in full. In such event, certificates for 
shares of Common Stock shall be issued only in the name of the Participant 
unless the Participant or the Participant's designee (in the event the 
Participant has died) elects otherwise by written notice to the Plan 
Committee and the Plan Committee gives prior written consent to such 
election. 

                                      5
<PAGE>

     If a Participant withdraws from an Offering, terminates employment for 
any reason, or elects to terminate participation in the Plan, the 
Administrator will transfer to the Participant a stock certificate for whole 
shares credited to his Plan Account (and for which the purchase price has 
been paid in full), unless the Participant elects to sell all or part of the 
Participant's shares in accordance with Section 14 below.

     14.  SALE OF SHARES OF COMMON STOCK.  A Participant may request that the 
Administrator sell all or any part of the shares of Common Stock credited to 
such Participant's Plan Account.  Upon receipt of a written request from a 
Participant, the Administrator, as the Participant's agent, will sell the 
number of shares of Common Stock specified in the Participant's request 
within five business days of receipt by the Administrator of instructions to 
sell the shares of Common Stock, and will deliver to the Participant the 
proceeds of the sale, less a handling charge, brokerage commissions, and 
other costs of sale.  Whole and fractional shares may be aggregated and sold 
with those of other Participants, in which case the proceeds for each 
Participant will be based on the average sales price of all shares aggregated 
and sold.  Any sale may, but need not, be made by purchase for other Plan 
Accounts, subject to and in accordance with the terms of the Plan, in which 
case the price will be the closing sale price of Common Stock as reported by 
the principal securities exchange or the inter-dealer quotation system on 
which the stock is traded or quoted on the date of receipt by the 
Administrator of the notice of the Participant's desire to sell shares of 
Common Stock or, if the stock is not traded on the date of receipt, the mean 
on the next prior date that it was so traded.  No sales of any fractional 
shares shall be permitted.

     15.  VOTING OF SHARES OF COMMON STOCK. The Administrator will vote a 
Participant's shares of Common Stock as instructed by the Participant on a 
form to be furnished by and returned to the Administrator at least ten days 
(or such shorter period as the law may require) before the meeting at which 
such shares of Common Stock are to be voted.  The Administrator will not vote 
shares of Common Stock for which no instructions are received.

     16.  TENDER OR EXCHANGE OFFER.  If a tender offer or exchange offer is 
commenced for shares of Common Stock, the Administrator, upon receipt of 
information with respect thereto as the holder of record of the shares of 
Common Stock, will either (i) forward, or arrange for the forwarding of, 
information provided by the offeror to holders of record of Common Stock to 
each Participant or (ii) provide to the offeror the name and mailing address 
of each Participant as reflected on the records of the Administrator with 
instructions to mail such material to each Participant.  The Administrator 
will tender all or part of a Participant's shares of Common Stock in response 
to written instructions from the Participant in such form as the 
Administrator may reasonably require and only if such instructions are 
received by the Administrator at least five days (or such shorter period as 
may be 

                                     6
<PAGE>

required by law) prior to the termination of the offer.  Unless the 
Administrator has received instructions in accordance with the previous 
sentence, it will not tender a Participant's shares of Common Stock.  Except 
to the extent disclosure is required to tender shares of Common Stock 
pursuant to proper written instructions, the Administrator will maintain the 
confidentiality of a Participant's election to tender or not tender shares of 
Common Stock.

     17.  CASH DIVIDENDS, STOCK DIVIDENDS AND SPLITS.  Any cash dividends 
paid on shares credited to a Participant's Plan Account will, when received 
by the Administrator, be credited to the Participant's Plan Account and used 
to purchase additional shares on the next Purchase Date.  Any stock dividends 
and any shares received as a result of a stock split on any shares of Common 
Stock credited to a Participant's Plan Account will, when received by the 
Administrator, be credited to the Participant's Plan Account.

     18.  STATEMENTS.  As soon as practicable after the cash credited to the 
Participant's Plan Account has been applied to the purchase of shares of 
Common Stock (but in no event later than 20 calendar days after the purchase) 
the Administrator will mail a statement to the Participant summarizing the 
transactions in the Participant's Plan Account since the last statement. 

     19.  NO RIGHTS AS A STOCKHOLDER.  None of the rights or privileges of a 
stockholder of the Company shall exist with respect to shares of Common Stock 
purchased under this Plan until a certificate representing such shares is 
issued.

     20.  RIGHTS NOT TRANSFERABLE.  Except as hereinafter set forth and 
unless otherwise provided by law, no Participant shall have the right to 
sell, assign, transfer, pledge, or otherwise dispose of or encumber either 
the right to participate in the Plan or any interest in the Participant's 
Plan Account, and such right and interest shall not be liable for or subject 
to the debts, contracts, or liabilities of such Participant.  If any such 
action is taken by the Participant, or any claim asserted by another party in 
respect of such right and interest, such action or claim will be treated as 
notice of cancellation, and except as may otherwise be required by law, such 
event shall be deemed to be a withdrawal from the Plan and the Participant's 
Plan Account shall be repaid to him as provided in Section 12.  

     Provided, however, that a Participant may designate in writing (on a 
form provided by the Plan Committee) the person who shall have the right to 
receive the Participant's Plan Account in the event of the Participant's 
death.  In the event of death, if a Participant has not designated a person 
to receive the Participant's Plan Account, such Participant's Plan Account 
shall be distributed to the Participant's estate. 

                                       7
<PAGE>

     21.  APPLICATION OF FUNDS.  All funds received or withheld by the Plan 
Committee under this Plan as Payroll Deductions shall be held by the Company 
without segregation and may be used for any general corporate purpose without 
restriction.

     22.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION.  Notwithstanding any 
other provision of the Plan, in the event of any change in the outstanding 
Common Stock by reason of a stock dividend, recapitalization, merger, 
consolidation, split-up, combination or exchange of shares, or the like, the 
aggregate number and class of shares available under the Plan, the number and 
class of shares subject to outstanding Offerings, the maximum number of 
shares which an individual Eligible Employee may purchase, and the Initial 
Offering Price shall be proportionately adjusted, and such other adjustments 
shall be made as may be deemed equitable, by the Plan Committee, whose 
determinations shall be conclusive.

     23.  AMENDMENTS OF THE PLAN.  Except as provided below, the Compensation 
Committee may at any time, and from time to time, make such changes in and 
additions to the Plan as the Compensation Committee deems advisable.  
However, the following amendments may only be made by the Board of Directors 
with approval by vote of the holders of a majority of shares of Common Stock 
voted at a properly convened meeting at which a quorum is present: (a) 
increase the maximum number of shares which may be purchased under the Plan, 
(b) reduce the purchase price per share, or (c) amend the requirements for an 
Eligible Employee. No amendment of the Plan may, without the consent of the 
Participant with respect to any outstanding Offering, materially and 
adversely affect the Eligible Employee's rights with respect to such Offering.

     24.  TERMINATION OF THE PLAN.  This Plan shall terminate (a) on the date 
that all of the shares authorized for sale under the Plan have been 
purchased, except as otherwise extended by authorizing additional shares, 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.

     Upon termination of the Plan and the exercise or lapse of all Offering 
rights hereunder, all remaining amounts credited to Plan Accounts of 
Participants shall be returned to such Participants in cash, without interest.

     25.  ALLOCATION OF SHARES IF EXCEED MAXIMUM OFFERED.  If the total 
number of shares which would otherwise be purchased by Participants through 
Payroll Deductions under any Offering exceeds the shares available for 
purchase under the Offering, the Plan Committee may allocate the available 
shares among the Participants on any basis consistent with the terms of the 
Plan, and any remaining funds credited to a Participant's Plan Account on the 
Purchase Date shall be returned to the Participant in cash, without interest. 

                                    8
<PAGE>

     26.  GOVERNMENTAL AND OTHER REGULATIONS.  The obligation of the Company 
to issue or transfer and deliver shares under this Plan shall be subject to 
(a) compliance with all applicable laws, governmental rules and regulations 
and administrative action, (b) the effectiveness of a Registration Statement 
under the Securities Act of 1933, as amended, with respect to such issue or 
transfer, if deemed necessary or appropriate by counsel for the Company, and 
(c) the condition that the shares of Common Stock reserved for issuance upon 
the purchase of shares subject to Offering under the Plan shall have been 
listed (or authorized for listing upon official notice of issuance) upon each 
securities exchange on which outstanding shares of the same class may then be 
listed.

     27.  APPROVAL OF STOCKHOLDERS.  The Plan has been adopted by the Board 
of Directors of the Company, subject to the approval of the stockholders of 
the Company.  If the stockholders do not approve the Plan by a vote of the 
holders of a majority of shares of Common Stock voted at a properly convened 
meeting at which a quorum is present, the Plan shall be immediately 
terminated and all funds held in Participants' Plan Accounts shall be 
returned to such Participants in cash, with interest at 5% per annum from the 
date of transfer to such accounts to the date of refund. If the stockholders 
have not approved the Plan by a vote of the holders of a majority of shares 
of Common Stock voted at a properly convened meeting at which a quorum is 
present within twelve (12) months after the date of adoption of the Plan by 
the Board of Directors, the Plan shall terminate on the date which is twelve 
(12) months after the date of adoption of the Plan by the Board, and all 
funds held in Participants' Plan Accounts shall be returned to such 
Participants in cash, with interest at 5% per annum from the date of transfer 
to such accounts to the date of refund.  If the stockholders have not 
approved the Plan by a vote of the holders of a majority of shares of Common 
Stock voted at a properly convened meeting at which a quorum is present prior 
to the last day of the first Offering Period, no funds in a Participant's 
Plan Account may be used to purchase shares under Section 7 above until such 
stockholder approval has been obtained; in that event, the first Purchase 
Date shall be the fifth business day after the date of stockholder approval. 

     28.  $25,000 LIMITATION. No Eligible Employee shall be included in an 
Offering which permits him to purchase Common Stock under all employee stock 
purchase plans of the Company and its subsidiaries to accrue (within the 
meaning of Section 423(b)(8) of the Code) at a rate which exceeds $25,000 of 
fair market value of such capital stock (determined at the Offering Date) for 
each calendar year in which such Offering is outstanding at any time.

     29.  INDEMNIFICATION.  No current or previous member of the Board of 
Directors, the Compensation Committee, or the Plan Committee, nor any officer 
or employee of the Company acting on behalf of the Board of Directors, the 
Compensation Committee, or the Plan Committee, shall be personally liable for 
any action, determination, or interpretation taken or made in good faith with 
respect to 

                                       9
<PAGE>

the Plan, and all such members of the Board of Directors, the Compensation 
Committee, or the Plan Committee and each and any officer or employee of the 
Company acting on their behalf shall, to the extent permitted by law, be 
fully indemnified and protected by the Company in respect of any such action, 
determination or interpretation.  The foregoing right of indemnification 
shall not be exclusive of any other rights of indemnification to which such 
individuals may be entitled under the Company's Certificate of Incorporation 
or Bylaws, as a matter of law, or otherwise.

     30.  INVESTMENT INTENT.  The Company may require that there be presented 
to and filed with it by any Participant(s) under the Plan, such evidence as 
it may deem necessary to establish that the rights to purchase Common Stock 
granted or the shares of Common Stock to be purchased or transferred 
hereunder are being acquired for investment and not with a view to their 
distribution.

     31.  NO RIGHT TO CONTINUE EMPLOYMENT.  This Plan does not constitute a 
contract of employment.  Nothing in the Plan or in any related documentation 
confers upon any employee the right to continue in the employ of the Company 
or any of its subsidiaries or interferes with or restricts in any way the 
right of the Company or any of its subsidiaries to discharge any employee at 
any time (subject to any contract rights of such employee).

     32.  GOVERNING LAW.  The law of the State of Delaware will govern all 
matters relating to this Plan except to the extent it is superseded by the 
federal laws of the United States of America.

     33.  CONSTRUCTION OF PLAN.  The captions used in this Plan are for 
convenience only and shall not be construed in interpreting the Plan.  
Whenever the context so requires, the masculine shall include the feminine 
and neuter, and the singular shall also include the plural, and conversely.

     IN WITNESS WHEREOF, the Company has caused this instrument to be 
executed as of the ____ day of __________________, 1997 by its Chief 
Executive Officer pursuant to prior action taken by the Board.

                                   INPUT/OUTPUT, INC.

                                   By: 
                                       -------------------------------------
                                       Gary D. Owens
                                       President and Chief Executive Officer
Attest:


- -----------------------------
Robert P. Brindley, Secretary

                                        10

<PAGE>
                                    Exhibit 5.1
                                          
                              HAYNES AND BOONE, L.L.P.
                         1000 Louisiana Street, Suite 4300
                                Houston, Texas 77002
                                   (713) 547-2000
                                          
                                   March 27, 1997

Input/Output, Inc.
11104 West Airport Blvd.
Suite 200
Stafford, Texas 77477

Gentlemen:

We have acted as counsel to Input/Output, Inc., a Delaware corporation (the 
"Company"), in connection with the preparation of the Registration Statement 
on Form S-8 (the "Registration Statement") filed with the Securities and 
Exchange Commission under the Securities Act of 1933, as amended, relating to 
the registration of 1,500,000 shares of Common Stock, par value $0.01 per 
share (the "Common Stock"), of the Company that may be issued pursuant to the 
terms of the Company's Employee Stock Purchase Plan (the "Plan").

In connection therewith, we have examined (i) the Certificate of 
Incorporation and the Bylaws of the Company, each as amended; (ii) minutes 
and records of the corporate proceedings of the Company with respect to the 
adoption of the Plan; (iii) certificates of certain officers and directors of 
the Company; (iv) the Plan; and (v) such other documents as we have deemed 
necessary for the expression of the opinions contained herein.

In making the foregoing examination, we have assumed the genuineness of all 
signatures and the authenticity of all documents submitted to us as 
originals, and the conformity to original documents of all documents 
submitted to us as certified or photostatic copies.  Furthermore, we have 
assumed that prices paid for shares of Common Stock will equal or exceed the 
par value per share of the Common Stock.  As to questions of fact material to 
this opinion, where such facts have not been independently established, and 
as to the content and form of the Certificate of Incorporation (as amended), 
Bylaws (as amended), minutes, records, resolutions and other documents or 
writings of the Company, we have relied, to the extent we deem reasonably 
appropriate, upon representations or certificates of officers or directors of 
the Company and upon documents, records and instruments furnished to us by 
the Company, without independent check or verification of their accuracy.

Based upon the foregoing, and having due regard for such legal considerations 
as we deem relevant, we are of the opinion that the 1,500,000 shares of 
Common Stock covered by the Registration Statement, which may be issued from 
time to time pursuant to the purchase of shares of Common Stock in accordance 
with the terms of the Plan, have been duly authorized for issuance by the 
Company, and, when so issued in accordance with the terms and conditions of 
the Plan, will be validly issued, fully paid and nonassessable.

We hereby consent to the filing of this opinion with the Securities and 
Exchange Commission as an exhibit to the Registration Statement.

                             Very truly yours,

                             /s/ Haynes and Boone, L.L.P.
                             Haynes and Boone, L.L.P.

<PAGE>
                                     Exhibit 23.1

                            INDEPENDENT AUDITORS' CONSENT


The Board of Directors
Input/Output, Inc.

We consent to incorporation by reference in the registration statement on 
Form S-8 of Input/Output, Inc., of our report dated June 24, 1996, relating 
to the consolidated balance sheets of Input/Output, Inc. and subsidiaries as 
of May 31, 1996 and 1995, and the related consolidated statements of 
operations, stockholders' equity, and cash flows for each of the years in the 
three-year period ended May 31, 1996, which report appears in the May 31, 
1996 annual report on Form 10-K of Input/Output, Inc.

                                            /s/ KPMG Peat Marwick LLP
                                            KPMG Peat Marwick LLP

Houston, Texas
March 24, 1997


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