CYBERONICS INC
S-8, 1998-11-03
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>   1
         AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON         , 1998
                                                        REGISTRATION NO. 333-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


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


                                CYBERONICS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


<TABLE>
<S>                                       <C>
        DELAWARE                                        76-0236465
- ------------------------                  ------------------------------------
(STATE OF INCORPORATION)                  (I.R.S. EMPLOYER IDENTIFICATION NO.)
</TABLE>


                       16511 SPACE CENTER BLVD., SUITE 600
                              HOUSTON, TEXAS 77058
   --------------------------------------------------------------------------
   (ADDRESS, INCLUDING ZIP CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)

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

                   AMENDED 1991 EMPLOYEE STOCK PURCHASE PLAN
                            (FULL TITLE OF THE PLAN)

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


                              PAMELA B. WESTBROOK
                                CYBERONICS, INC.
                       16511 SPACE CENTER BLVD., SUITE 600
                              HOUSTON, TEXAS 77058
                                 (281) 332-1375
(NAME, ADDRESS, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF AGENT FOR SERVICE)

                                   COPIES TO:
                             KENNETH M. SIEGEL, ESQ.
                        WILSON SONSINI GOODRICH & ROSATI
                            PROFESSIONAL CORPORATION
                               650 PAGE MILL ROAD
                               PALO ALTO, CA 94306
                                 (650) 493-9300


                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
                                            AMOUNT                PROPOSED             PROPOSED MAXIMUM        AMOUNT OF
        TITLE OF SECURITIES TO               TO BE            MAXIMUM OFFERING        AGGREGATE OFFERING      REGISTRATION
            BE REGISTERED                 REGISTERED          PRICE PER SHARE               PRICE                 FEE
- --------------------------------------------------------------------------------------------------------------------------
<S>                                       <C>                   <C>                      <C>                     <C>
Common Stock issuable under 1991          100,000(1)            $4.9141(2)               $491,410(2)             $136.61
Employee Stock Purchase Plan
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

(1)     The shares to be registered under this Registration Statement represent
        additional shares authorized to be issued under the 1991 Employee Stock
        Purchase Plan. An aggregate of 100,000 shares were previously registered
        on Registrant's registration statement on Form S-8 (SEC File No.
        33-65276) filed with the Securities and Exchange Commission on June 30,
        1993.

(2)     Estimated pursuant to Rule 457(c) under the Securities Act of 1933, as
        amended (the "Act") solely for the purpose of calculating the total
        registration fee. Because the price at which options to be granted in
        the future may be exercised is not currently determined, computation is
        based upon 85% of the per share price of the average between the ask and
        bid price reported in the Nasdaq National Market on October 28, 1998,
        which average was $5.7813.

================================================================================



<PAGE>   2

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

EXPLANATORY NOTE

          This Registration Statement on Form S-8 is being filed for the purpose
of registering an additional 100,000 shares pursuant to the Registrant's Amended
1991 Employee Stock Purchase Plan (the "Plan"). The Registration Statement on
Form S-8 previously filed with the Securities and Exchange Commission (the
"Commission") pursuant to the Securities Act of 1933, as amended (the
"Securities Act") relating to the Plan (SEC File No. 33-65276) is incorporated
herein by reference.

Item 3.   INCORPORATION OF DOCUMENTS BY REFERENCE.

          There are hereby incorporated by reference into this Registration
Statement the following documents and information heretofore filed with the
Commission:

          1. The Registrant's Annual Report on Form 10-K for the fiscal year
ended June 30, 1998 filed pursuant to Section 13(a) of the Securities and
Exchange Act of 1934, as amended (the "Exchange Act").

          2. The description of Registrant's Common Stock to be offered hereby
contained in the Company's Registration Statement on Form 8-A, as declared
effective by the Commission on February 10, 1993, filed pursuant to Section 12
of the Exchange Act and, any amendment or report filed for the purpose of
updating such description.

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



Item 4.   DESCRIPTION OF SECURITIES.

          Not applicable.

Item 5.   INTERESTS OF NAMED EXPERTS AND COUNSEL.



                                      II-2
<PAGE>   3

          Not applicable.

Item 6.   INDEMNIFICATION OF DIRECTORS AND OFFICERS.

          Section 145 of the Delaware General Corporation Law authorizes a court
to award or a corporation's Board of Directors to grant indemnification to
directors and officers in terms sufficiently broad to permit such
indemnification under certain circumstances for liabilities (including
reimbursement for expenses incurred) arising under the Securities Act of 1933,
as amended. The Company has included in the Certificate of Incorporation a
provision that to the fullest extent permitted by Delaware law, the Company's
directors will not be liable for monetary damages for breach of the directors'
fiduciary duty of care to the Company and its stockholders. In addition, the
Company's Bylaws provide that the Company is required to indemnify its officers
and directors to the fullest extent permitted by Delaware law, including those
circumstances in which indemnification would otherwise be discretionary, and
that the Company is required to advance expenses to its officers and directors
as incurred. Further, the Company has entered into indemnification agreements
with its officers and directors, providing such individuals indemnification to
the maximum extent permitted by the Delaware General Corporation Law.

Item 7.   EXEMPTION FROM REGISTRATION CLAIMED.

          Not applicable.

Item 8.   EXHIBITS.

<TABLE>
<CAPTION>

         Exhibit
         Number                  Document
         ------                  --------

<S>                 <C>
          4.1       Cyberonics, Inc. Amended 1991 Employee Stock Purchase Plan.

          5.1       Opinion of Wilson Sonsini Goodrich & Rosati, Professional
                    Corporation, as to legality of securities being registered.

          23.1      Consent of Arthur Andersen LLP, Independent Public Accountants.

          23.2      Consent of Counsel (contained in Exhibit 5.1).

          24.1      Power of Attorney (see page II-5).
</TABLE>


Item 9.   UNDERTAKINGS

          (a) 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 to include any
material information with respect to



                                      II-3
<PAGE>   4

the plan of distribution not previously disclosed in the Registration Statement
or any material change to such information in the Registration Statement.

               (2) That, for the purpose of determining any liability under the
Securities Act, 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) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) 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) Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers and controlling persons
of the Registrant pursuant to the items described in Item 6 of Part II of this
Registration Statement, or otherwise, the Registrant has been advised that in
the opinion of the Commission such indemnification is against public policy as
expressed in the Securities 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
Securities Act and will be governed by the final adjudication of such issue.



                                      II-4
<PAGE>   5

                                   SIGNATURES

          Pursuant to the requirements of the Securities Act of 1933, the
Registrant, Cyberonics, Inc., certifies that it has reasonable grounds to
believe that it meets all of 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 Houston, State of Texas,
on this 27th day of October, 1998. CYBERONICS, INC.

                                            By: /s/  ROBERT CUMMINS
                                               ---------------------------------
                                               Robert P. Cummins
                                               President and Chief Executive 
                                               Officer

                                POWER OF ATTORNEY

          KNOW ALL PERSONS BY THESE PRESENTS, that each such person whose
signature appears below constitutes and appoints, jointly and severally, Reese
S. Terry, Jr. and Pamela B. Westbrook, his or her attorneys-in-fact, each with 
the power of substitution, for him or her in any and all capacities, to sign any
amendments to this Registration Statement on Form S-8 (including post-effective
amendments), and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
hereby ratifying and confirming all that each of said attorneys-in-fact, or his
or her substitute or substitutes, may do or cause to be done by virtue hereof.

          Pursuant to the requirements of the Securities Act of 1933, as
amended, this Registration Statement on Form S-8 has been signed by the
following persons in the capacities and on the dates indicated.


<TABLE>
<CAPTION>
       SIGNATURE                         TITLE                               DATE
- --------------------------     ----------------------------------      ----------------
<S>                            <C>                                     <C>
/s/  REESE S. TERRY            Chairman of the Board and               October 27, 1998
- --------------------------     Executive Vice President
     Reese S. Terry

/s/  ROBERT P. CUMMINS         President, Chief Executive              October 27, 1998
- --------------------------     Officer and Director 
     Robert P. Cummins         (Principal Executive Officer)

/s/  PAMELA B. WESTBROOK       Vice President, Finance and 
- --------------------------     Administration and Chief Financial      October 27, 1998
     Pamela B. Westbrook       Officer (Principal Financial and 
                               Accounting Officer)

/s/  STANLEY H. APPEL          Director                                October 27, 1998
- --------------------------
     Stanley H. Appel

/s/  TONY COELHO               Director                                October 27, 1998
- --------------------------
     Tony Coelho

/s/  THOMAS A. DUERDEN         Director                                October 27, 1998
- --------------------------
     Thomas A. Duerden

/s/  MICHAEL J. STRAUSS        Director                                October 27, 1998
- --------------------------
     Michael J. Strauss
</TABLE>


                                      II-5
<PAGE>   6

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549



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

                                    EXHIBITS

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


                       Registration Statement on Form S-8

                                Cyberonics, Inc.

                                November 3, 1998



<PAGE>   7

                                INDEX TO EXHIBITS



<TABLE>
<CAPTION>

       EXHIBIT
        NUMBER                        EXHIBIT
        ------                        -------

<S>                 <C>
           4.1      Cyberonics, Inc. Amended 1991 Employee Stock Purchase Plan.

           5.1      Opinion of Wilson Sonsini Goodrich & Rosati, Professional
                    Corporation, as to the legality of securities being
                    registered.

          23.1      Consent of Arthur Andersen LLP, Independent Public Accountants.

          23.2      Consent of Counsel (included in Exhibit 5.1).

          24.1      Power of Attorney (see page II-5)
</TABLE>


<PAGE>   1

                                                                     EXHIBIT 4.1



                                CYBERONICS, INC.
                                    AMENDED
                       1991 EMPLOYEE STOCK PURCHASE PLAN



          The following constitute the provisions of the 1991 Employee Stock
Purchase Plan of Cyberonics, Inc., as amended April 8, 1998.

          1. Purpose. The purpose of the Plan is to provide employees of the
Company and its Designated Subsidiaries with an opportunity to purchase Common
Stock of the Company through accumulated payroll deductions. It is the intention
of the Company to have the Plan qualify as an "Employee Stock Purchase Plan"
under Section 423 of the Internal Revenue Code of 1986, as amended. The
provisions of the Plan, accordingly, shall be construed so as to extend and
limit participation in a manner consistent with the requirements of that section
of the Code.

          2. Definitions.

               (a) "Board" shall mean the Board of Directors of the Company.

               (b) "Code" shall mean the Internal Revenue Code of 1986, as
amended.

               (c) "Common Stock" shall mean the Common Stock of the Company.

               (d) "Company" shall mean Cyberonics, Inc., a Delaware
corporation.

               (e) "Compensation" shall mean all base straight time gross
earnings, overtime, shift premium and commissions, but shall exclude incentive
compensation, incentive payments, bonuses and other compensation.

               (f) "Designated Subsidiaries" shall mean the Subsidiaries which
have been designated by the Board from time to time in its sole discretion as
eligible to participate in the Plan.

               (g) "Employee" shall mean any individual who is an employee of
the Company for purposes of tax withholding under the Code whose customary
employment with the Company or any Designated Subsidiary is at least twenty (20)
hours per week and more than five (5) months in any calendar year. For purposes
of the Plan, the employment relationship shall be treated as continuing intact
while the individual is on sick leave or other leave of absence approved by the
Company. Where the period of leave exceeds 90 days and the individual's right to
reemployment is not guaranteed either by statute or by contract, the employment
relationship will be deemed to have terminated on the 91st day of such leave.

               (h) "Enrollment Date" shall mean the first day of each Offering
Period.



<PAGE>   2

               (i) "Exercise Date" shall mean the last day of each Offering
Period.

               (j) "Fair Market Value" shall mean, as of any date, the value of
Common Stock determined as follows:

                    (1) If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the National
Market System of the National Association of Securities Dealers, Inc. Automated
Quotation ("NASDAQ") System, its Fair Market Value shall be the closing sale
price for the Common Stock (or the mean of the closing bid and asked prices, if
no sales were reported), as quoted on such exchange (or the exchange with the
greatest volume of trading in Common Stock) or system on the date of such
determination, as reported in the Wall Street Journal or such other source as
the Board deems reliable, or;

                    (2) If the Common Stock is quoted on the NASDAQ system (but
not on the National Market System thereof) or is regularly quoted by a
recognized securities dealer but selling prices are not reported, its Fair
Market Value shall be the mean of the closing bid and asked prices for the
Common Stock on the date of such determination, as reported in the Wall Street
Journal or such other source as the Board deems reliable, or;

                    (3) In the absence of an established market for the Common
Stock, the Fair Market Value thereof shall be determined in good faith by the
Board.

               (k) "Offering Period" shall mean a period of approximately six
(6) months, commencing on the first Trading Day on or after December 1 and
terminating on the last Trading Day in the period ending the following May 31,
or commencing on the first Trading Day on or after June 1 and terminating on the
last Trading Day in the period ending the following November 30, during which an
option granted pursuant to the Plan may be exercised.

               (l) "Plan" shall mean this Employee Stock Purchase Plan.

               (m) "Purchase Price" shall mean an amount equal to 85% of the
Fair Market Value of a share of Common Stock on the Enrollment Date or on the
Exercise Date, whichever is lower.

               (n) "Reserves" shall mean the number of shares of Common Stock
covered by each option under the Plan which have not yet been exercised and the
number of shares of Common Stock which have been authorized for issuance under
the Plan but not yet placed under option.

               (o) "Subsidiary" shall mean a corporation, domestic or foreign,
of which not less than 50% of the voting shares are held by the Company or a
Subsidiary, whether or not such corporation now exists or is hereafter organized
or acquired by the Company or a Subsidiary.

               (p) "Trading Day" shall mean a day on which national stock
exchanges and the National Association of Securities Dealers Automated Quotation
(NASDAQ) System are open for trading.



                                       -2-
<PAGE>   3

          3. Eligibility.

               (a) Any Employee (as defined in Section 2(g)), who shall be
employed by the Company on a given Enrollment Date shall be eligible to
participate in the Plan.

               (b) Any provisions of the Plan to the contrary notwithstanding,
no Employee shall be granted an option under the Plan (i) to the extent,
immediately after the grant, such Employee (or any other person whose stock
would be attributed to such Employee pursuant to Section 424(d) of the Code)
would own capital stock of the Company and/or hold outstanding options to
purchase such stock possessing five percent (5%) or more of the total combined
voting power or value of all classes of the capital stock of the Company or of
any Subsidiary, or (ii) to the extent his or her rights to purchase stock under
all employee stock purchase plans of the Company and its subsidiaries to accrue
at a rate which exceeds Twenty-Five Thousand Dollars ($25,000) worth of stock
(determined at the fair market value of the shares at the time such option is
granted) for each calendar year in which such option is outstanding at any time.

          4. Offering Periods. The Plan shall be implemented by consecutive
Offering Periods with a new Offering Period commencing on the first Trading Day
on or after June 1 and December 1 each year, or on such other date as the Board
shall determine, and continuing thereafter until terminated in accordance with
Section 19 hereof. The Board shall have the power to change the duration of
Offering Periods (including the commencement dates thereof) with respect to
future offerings without shareholder approval if such change is announced at
least fifteen (15) days prior to the scheduled beginning of the first Offering
Period to be affected thereafter.

          5. Participation.

               (a) An eligible Employee may become a participant in the Plan by
completing a subscription agreement authorizing payroll deductions in the form
of Exhibit A to this Plan and filing it with the Company's payroll office at
least five (5) business days prior to the applicable Enrollment Date, unless a
later time for filing the subscription agreement is set by the Board for all
eligible Employees with respect to a given Offering Period.

               (b) Payroll deductions for a participant shall commence on the
first payroll following the Enrollment Date and shall end on the last payroll in
the Offering Period to which such authorization is applicable, unless sooner
terminated by the participant as provided in Section 10 hereof.

          6. Payroll Deductions.

               (a) At the time a participant files his or her subscription
agreement, he or she shall elect to have payroll deductions made on each pay day
during the Offering Period in an amount, expressed in whole percentages, of the
Compensation which he or she receives on each pay day during the Offering Period
not exceeding fifteen percent (15%), and the aggregate of such payroll
deductions during the Offering Period shall not exceed fifteen percent (15%) of
the participant's Compensation during said Offering Period.



                                       -3-
<PAGE>   4

               (b) All payroll deductions made for a participant shall be
credited to his or her account under the Plan. A participant may not make any
additional payments into such account.

               (c) A participant may discontinue his or her participation in the
Plan as provided in Section 10 hereof, or may increase (but not above 15% of
Compensation) or decrease the rate of his or her payroll deductions during the
Offering Period by completing or filing with the Company a new subscription
agreement authorizing a change in payroll deduction rate. The Board may, in its
discretion, limit the number of participation rate changes during any Offering
Period. The change in rate shall be effective with the first full payroll period
following five (5) business days after the Company's receipt of the new
subscription agreement unless the Company elects to process a given change in
participation more quickly. A participant's subscription agreement shall remain
in effect for successive Offering Periods unless terminated as provided in
Section 10 hereof.

               (d) Notwithstanding the foregoing, to the extent necessary to
comply with Section 423(b)(8) of the Code and Section 3(b) hereof, a
participant's payroll deductions may be decreased to 0% at such time during any
Offering Period which is scheduled to end during the current calendar year (the
"Current Offering Period") that the aggregate of all payroll deductions which
were previously used to purchase stock under the Plan in a prior Offering Period
which ended during that calendar year plus all payroll deductions accumulated
with respect to the Current Offering Period equal $21,250. Payroll deductions
shall recommence at the rate provided in such participant's subscription
agreement at the beginning of the first Offering Period which is scheduled to
end in the following calendar year, unless terminated by the participant as
provided in Section 10 hereof.

               (e) At the time the option is exercised, in whole or in part, or
at the time some or all of the Company's Common Stock issued under the Plan is
disposed of, the participant must make adequate provision for the Company's
federal, state, or other tax withholding obligations, if any, which arise upon
the exercise of the option or the disposition of the Common Stock. At any time,
the Company may, but will not be obligated to, withhold from the participant's
compensation the amount necessary for the Company to meet applicable withholding
obligations, including any withholding required to make available to the Company
any tax deductions or benefits attributable to sale or early disposition of
Common Stock by the Employee.

          7. Grant of Option. On the Enrollment Date of each Offering Period,
each eligible Employee participating in such Offering Period shall be granted an
option to purchase on the Exercise Date of such Offering Period (at the
applicable Purchase Price) up to a number of shares of the Company's Common
Stock determined by dividing such Employee's payroll deductions accumulated
prior to such Exercise Date and retained in the Participant's account as of the
Exercise Date by the applicable Purchase Price; provided that in no event shall
an Employee be permitted to purchase during each Offering Period more than a
number of Shares determined by dividing $12,500 by the Fair Market Value of a
share of the Company's Common Stock on the Enrollment Date, and provided further
that such purchase shall be subject to the limitations set forth in Sections
3(b) and 12 hereof. Exercise of the option shall occur as provided in Section 8
hereof, unless the participant has withdrawn pursuant to Section 10 hereof, and
shall expire on the last day of the Offering Period.



                                       -4-
<PAGE>   5

          8. Exercise of Option. Unless a participant withdraws from the Plan as
provided in Section 10 hereof, his or her option for the purchase of shares will
be exercised automatically on the Exercise Date, and the maximum number of full
shares subject to option shall be purchased for such participant at the
applicable Purchase Price with the accumulated payroll deductions in his or her
account. No fractional shares will be purchased; any payroll deductions
accumulated in a participant's account which are not sufficient to purchase a
full share shall be retained in the participant's account for the subsequent
Offering Period, subject to earlier withdrawal by the participant as provided in
Section 10 hereof. Any other monies left over in a participant's account after
the Exercise Date shall be returned to the participant. During a participant's
lifetime, a participant's option to purchase shares hereunder is exercisable
only by him or her.

          9. Delivery. As promptly as practicable after each Exercise Date on
which a purchase of shares occurs, the Company shall arrange the delivery to
each participant, as appropriate, of a certificate representing the shares
purchased upon exercise of his or her option.

          10. Withdrawal; Termination of Employment.

               (a) A participant may withdraw all but not less than all the
payroll deductions credited to his or her account and not yet used to exercise
his or her option under the Plan at any time by giving written notice to the
Company in the form of Exhibit B to this Plan. All of the participant's payroll
deductions credited to his or her account will be paid to such participant
promptly after receipt of notice of withdrawal and such participant's option for
the Offering Period will be automatically terminated, and no further payroll
deductions for the purchase of shares will be made during the Offering Period.
If a participant withdraws from an Offering Period, payroll deductions will not
resume at the beginning of the succeeding Offering Period unless the participant
delivers to the Company a new subscription agreement.

               (b) Upon a participant's ceasing to be an Employee (as defined in
Section 2(g) hereof), for any reason, including by virtue of him or her having
failed to remain an Employee of the Company for at least twenty (20) hours per
week during an Offering Period in which the Employee is a participant, he or she
will be deemed to have elected to withdraw from the Plan and the payroll
deductions credited to such participant's account during the Offering Period but
not yet used to exercise the option will be returned to such participant or, in
the case of his or her death, to the person or persons entitled thereto under
Section 14 hereof, and such participant's option will be automatically
terminated.

               (c) A participant's withdrawal from an Offering Period will not
have any effect upon his or her eligibility to participate in any similar plan
which may hereafter be adopted by the Company or in succeeding Offering Periods
which commence after the termination of the Offering Period from which the
participant withdraws.

          11. Interest. No interest shall accrue or be payable on the payroll
deductions of a participant in the Plan.



                                       -5-
<PAGE>   6

          12. Stock.

               (a) The maximum number of shares of the Company's Common Stock
which shall be made available for sale under the Plan shall be 200,000 shares,
subject to adjustment upon changes in capitalization of the Company as provided
in Section 18 hereof. If on a given Exercise Date the number of shares with
respect to which options are to be exercised exceeds the number of shares then
available under the Plan, the Company shall make a pro rata allocation of the
shares remaining available for purchase in as uniform a manner as shall be
practicable and as it shall determine to be equitable.

               (b) The participant will have no interest or voting right in
shares covered by his option until such option has been exercised.

               (c) Shares to be delivered to a participant under the Plan will
be registered in the name of the participant or in the name of the participant
and his or her spouse.

          13. Administration.

               (a) Administrative Body. The Plan shall be administered by the
Board or a committee of members of the Board appointed by the Board. The Board
or its committee shall have full and exclusive discretionary authority to
construe, interpret and apply the terms of the Plan, to determine eligibility
and to adjudicate all disputed claims filed under the Plan. Every finding,
decision and determination made by the Board or its committee shall, to the full
extent permitted by law, be final and binding upon all parties. Members of the
Board who are eligible Employees are permitted to participate in the Plan,
provided that:

                    (1) Members of the Board who are eligible to participate in
the Plan may not vote on any matter affecting the administration of the Plan or
the grant of any option pursuant to the Plan.

                    (2) If a Committee is established to administer the Plan, no
member of the Board who is eligible to participate in the Plan may be a member
of the Committee.

               (b) Rule 16b-3 Limitations. Notwithstanding the provisions of
Subsection (a) of this Section 13, in the event that Rule 16b-3 promulgated
under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or
any successor provision ("Rule 16b-3") provides specific requirements for the
administrators of plans of this type, the Plan shall be only administered by
such a body and in such a manner as shall comply with the applicable
requirements of Rule 16b-3. Unless permitted by Rule 16b-3, no discretion
concerning decisions regarding the Plan shall be afforded to any committee or
person that is not "disinterested" as that term is used in Rule 16b-3.

          14. Designation of Beneficiary.

               (a) A participant may file a written designation of a beneficiary
who is to receive any shares and cash, if any, from the participant's account
under the Plan in the event of such participant's



                                       -6-
<PAGE>   7

death subsequent to an Exercise Date on which the option is exercised but prior
to delivery to such participant of such shares and cash. In addition, a
participant may file a written designation of a beneficiary who is to receive
any cash from the participant's account under the Plan in the event of such
participant's death prior to exercise of the option. If a participant is married
and the designated beneficiary is not the spouse, spousal consent shall be
required for such designation to be effective.

               (b) Such designation of beneficiary may be changed by the
participant at any time by written notice. In the event of the death of a
participant and in the absence of a beneficiary validly designated under the
Plan who is living at the time of such participant's death, the Company shall
deliver such shares and/or cash to the executor or administrator of the estate
of the participant, or if no such executor or administrator has been appointed
(to the knowledge of the Company), the Company, in its discretion, may deliver
such shares and/or cash to the spouse or to any one or more dependents or
relatives of the participant, or if no spouse, dependent or relative is known to
the Company, then to such other person as the Company may designate.

          15. Transferability. Neither payroll deductions credited to a
participant's account nor any rights with regard to the exercise of an option or
to receive shares under the Plan may be assigned, transferred, pledged or
otherwise disposed of in any way (other than by will, the laws of descent and
distribution or as provided in Section 14 hereof) by the participant. Any such
attempt at assignment, transfer, pledge or other disposition shall be without
effect, except that the Company may treat such act as an election to withdraw
funds from an Offering Period in accordance with Section 10 hereof.

          16. Use of Funds. All payroll deductions received or held by the
Company under the Plan may be used by the Company for any corporate purpose, and
the Company shall not be obligated to segregate such payroll deductions.

          17. Reports. Individual accounts will be maintained for each
participant in the Plan. Statements of account will be given to participating
Employees at least annually, which statements will set forth the amounts of
payroll deductions, the Purchase Price, the number of shares purchased and the
remaining cash balance, if any.

          18. Adjustments Upon Changes in Capitalization.

               (a) Changes in Capitalization. Subject to any required action by
the shareholders of the Company, the Reserves as well as the price per share of
Common Stock covered by each option under the Plan which has not yet been
exercised shall be proportionately adjusted for any increase or decrease in the
number of issued shares of Common Stock resulting from a stock split, reverse
stock split, stock dividend, combination or reclassification of the Common
Stock, or any other increase or decrease in the number of shares of Common Stock
effected without receipt of consideration by the Company; provided, however,
that conversion of any convertible securities of the Company shall not be deemed
to have been "effected without receipt of consideration". Such adjustment shall
be made by the Board, whose determination in that respect shall be final,
binding and conclusive. Except as expressly provided herein, no issuance by the
Company of shares of stock of any class, or securities



                                       -7-
<PAGE>   8

convertible into shares of stock of any class, shall affect, and no adjustment
by reason thereof shall be made with respect to, the number or price of shares
of Common Stock subject to an option.

               (b) Dissolution or Liquidation. In the event of the proposed
dissolution or liquidation of the Company, the Offering Period will terminate
immediately prior to the consummation of such proposed action, unless otherwise
provided by the Board.

               (c) Merger or Asset Sale. In the event of a proposed sale of all
or substantially all of the assets of the Company, or the merger of the Company
with or into another corporation, each option under the Plan shall be assumed or
an equivalent option shall be substituted by such successor corporation or a
parent or subsidiary of such successor corporation, unless the Board determines,
in the exercise of its sole discretion and in lieu of such assumption or
substitution, to shorten the Offering Period then in progress by setting a new
Exercise Date (the "New Exercise Date") or to cancel each outstanding right to
purchase and refund all sums collected from participants during the Offering
Period then in progress. If the Board shortens the Offering Period then in
progress in lieu of assumption or substitution in the event of a merger or sale
of assets, the Board shall notify each participant in writing, at least ten (10)
business days prior to the New Exercise Date, that the Exercise Date for his
option has been changed to the New Exercise Date and that his option will be
exercised automatically on the New Exercise Date, unless prior to such date he
has withdrawn from the Offering Period as provided in Section 10 hereof. For
purposes of this paragraph, an option granted under the Plan shall be deemed to
be assumed if, following the sale of assets or merger, the option confers the
right to purchase, for each share of option stock subject to the option
immediately prior to the sale of assets or merger, the consideration (whether
stock, cash or other securities or property) received in the sale of assets or
merger by holders of Common Stock for each share of Common Stock held on the
effective date of the transaction (and if such holders were offered a choice of
consideration, the type of consideration chosen by the holders of a majority of
the outstanding shares of Common Stock); provided, however, that if such
consideration received in the sale of assets or merger was not solely common
stock of the successor corporation or its parent (as defined in Section 424(e)
of the Code), the Board may, with the consent of the successor corporation and
the participant, provide for the consideration to be received upon exercise of
the option to be solely common stock of the successor corporation or its parent
equal in fair market value to the per share consideration received by holders of
Common Stock and the sale of assets or merger.

               The Board may, if it so determines in the exercise of its sole
discretion, also make provision for adjusting the Reserves, as well as the price
per share of Common Stock covered by each outstanding option, in the event the
Company effects one or more reorganizations, recapitalizations, rights offerings
or other increases or reductions of shares of its outstanding Common Stock, and
in the event of the Company being consolidated with or merged into any other
corporation.

          19. Amendment or Termination.

               (a) The Board of Directors of the Company may at any time and for
any reason terminate or amend the Plan. Except as provided in Section 18 hereof,
no such termination can affect options previously granted, provided that an
Offering Period may be terminated by the Board of



                                       -8-
<PAGE>   9

Directors on any Exercise Date if the Board determines that the termination of
the Plan is in the best interests of the Company and its shareholders. Except as
provided in Section 18 hereof, no amendment may make any change in any option
theretofore granted which adversely affects the rights of any participant. To
the extent necessary to comply with Rule 16b-3 or under Section 423 of the Code
(or any successor rule or provision or any other applicable law or regulation),
the Company shall obtain shareholder approval in such a manner and to such a
degree as required.

               (b) Without shareholder consent and without regard to whether any
participant rights may be considered to have been "adversely affected," the
Board (or its committee) shall be entitled to change the Offering Periods, limit
the frequency and/or number of changes in the amount withheld during an Offering
Period, establish the exchange ratio applicable to amounts withheld in a
currency other than U.S. dollars, permit payroll withholding in excess of the
amount designated by a participant in order to adjust for delays or mistakes in
the Company's processing of properly completed withholding elections, establish
reasonable waiting and adjustment periods and/or accounting and crediting
procedures to ensure that amounts applied toward the purchase of Common Stock
for each participant properly correspond with amounts withheld from the
participant's Compensation, and establish such other limitations or procedures
as the Board (or its committee) determines in its sole discretion advisable
which are consistent with the Plan.

          20. Notices. All notices or other communications by a participant to
the Company under or in connection with the Plan shall be deemed to have been
duly given when received in the form specified by the Company at the location,
or by the person, designated by the Company for the receipt thereof.

          21. Conditions Upon Issuance of Shares. Shares shall not be issued
with respect to an option unless the exercise of such option and the issuance
and delivery of such shares pursuant thereto shall comply with all applicable
provisions of law, domestic or foreign, including, without limitation, the
Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as
amended, the rules and regulations promulgated thereunder, and the requirements
of any stock exchange upon which the shares may then be listed, and shall be
further subject to the approval of counsel for the Company with respect to such
compliance.

               As a condition to the exercise of an option, the Company may
require the person exercising such option to represent and warrant at the time
of any such exercise that the shares are being purchased only for investment and
without any present intention to sell or distribute such shares if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned applicable provisions of law.

          22. Term of Plan. The Plan shall become effective upon the earlier to
occur of its adoption by the Board of Directors or its approval by the
shareholders of the Company. It shall continue in effect for a term of ten (10)
years from the later of (i) the effective date or (ii) the date of any
amendment, unless sooner terminated under Section 19 hereof.

          23. Additional Restrictions of Rule 16b-3. The terms and conditions of
options granted hereunder to, and the purchase of shares by, persons subject to
Section 16 of the Exchange Act shall



                                       -9-
<PAGE>   10

comply with the applicable provisions of Rule 16b-3. This Plan shall be deemed
to contain, and such options shall contain, and the shares issued upon exercise
thereof shall be subject to, such additional conditions and restrictions as may
be required by Rule 16b-3 to qualify for the maximum exemption from Section 16
of the Exchange Act with respect to Plan transactions.



Adopted by the

Board of Directors:  December 10, 1991
Stockholders:         January 7, 1992

Amendment adopted by the
Board of Directors: April 8, 1998 
Stockholders:


                                      -10-

<PAGE>   1

                                                                     EXHIBIT 5.1

                 [WILSON SONSINI GOODRICH & ROSATI LETTERHEAD]

                                November 3, 1998


Cyberonics, Inc.
16511 Space Center Blvd., Suite 600
Houston, TX 77058

          RE: Registration Statement on Form S-8

Ladies and Gentlemen:

        We have examined the Registration Statement on Form S-8 to be filed by
you with the Securities and Exchange Commission on or about November 3, 1998
(the "Registration Statement") in connection with the registration under the
Securities Act of 1933, as amended, of an aggregate of an additional 100,000
shares of your Common Stock (the "Shares") reserved for issuance under the
Amended 1991 Employee Stock Purchase Plan (the "1991 Plan"). As your counsel, we
have examined the proceedings taken and are familiar with the proceedings
proposed to be taken by you in connection with the issuance and sale of the
Shares pursuant to the 1991 Plan.

          It is our opinion that, when issued and sold in the manner described
in the 1991 Plan, and pursuant to the agreement which accompany each grant under
the 1991 Plan, the Shares will be legally and validly issued, fully-paid and
non-assessable.

          We consent to the use of this opinion as an exhibit to the
Registration Statement, and further consent to the use of our name wherever
appearing in the Registration Statement and any amendments thereto.

                                            Very truly yours,

                                            WILSON SONSINI GOODRICH & ROSATI
                                            Professional Corporation


                                            /s/ WILSON SONSINI GOODRICH & ROSATI

<PAGE>   1

                                                                    EXHIBIT 23.1



                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


          As independent public accountants, we hereby consent to the
incorporation by reference in this Registration Statement on Form S-8 pertaining
to the 1991 Employee Stock Purchase Plan of Cyberonics, Inc. of our report dated
August 13, 1998, included in Cyberonics, Inc.'s Form 10-K for the year ended
June 30, 1998 and to all references to our Firm included in this Registration
Statement.



/s/ ARTHUR ANDERSEN LLP



Houston, Texas
October 27, 1998


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