ASPECT MEDICAL SYSTEMS INC
S-1/A, 2000-01-27
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>   1

    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 27, 2000

                                                      REGISTRATION NO. 333-86295
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------

                                AMENDMENT NO. 8

                                       TO

                                    FORM S-1
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933

                          ASPECT MEDICAL SYSTEMS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
                            ------------------------

<TABLE>
<S>                                  <C>                                  <C>
              DELAWARE                               3845                              04-2985553
  (STATE OR OTHER JURISDICTION OF        (PRIMARY STANDARD INDUSTRIAL               (I.R.S. EMPLOYER
   INCORPORATION OR ORGANIZATION)        CLASSIFICATION CODE NUMBER)             IDENTIFICATION NUMBER)
</TABLE>

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

                                TWO VISION DRIVE
                          NATICK, MASSACHUSETTS 01760
                                 (508) 653-0603
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------

                               NASSIB G. CHAMOUN
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                          ASPECT MEDICAL SYSTEMS, INC.
                                TWO VISION DRIVE
                             NATICK, MASSACHUSETTS
                                 (508) 653-0603
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------

                                   COPIES TO:

<TABLE>
<S>                                                    <C>
                SUSAN W. MURLEY, ESQ.                                  LESLIE E. DAVIS, ESQ.
                  HALE AND DORR LLP                               TESTA, HURWITZ & THIBEAULT, LLP
                   60 STATE STREET                                        125 HIGH STREET
             BOSTON, MASSACHUSETTS 02109                            BOSTON, MASSACHUSETTS 02110
              TELEPHONE: (617) 526-6000                              TELEPHONE: (617) 248-7000
               TELECOPY: (617) 526-5000                               TELECOPY: (617) 248-7100
</TABLE>

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

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As soon as
practicable after the effective date hereof.

    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act,
check the following box. [ ]

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [ ] __________

    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the same
offering. [ ] __________

    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the same
offering. [ ] __________

    If delivery of the Prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]
                            ------------------------


    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2


                                EXPLANATORY NOTE



     This Amendment No. 8 to the Registrant's Registration Statement on Form S-1
(Commission File No. 333-86295) is being filed solely for the purpose of filing
Exhibit 5.1 thereto.

<PAGE>   3

                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Amendment No. 8 to the Registration Statement to be signed
on its behalf by the undersigned, thereunto duly authorized, in Natick,
Massachusetts on January 27, 2000.


                                          ASPECT MEDICAL SYSTEMS, INC.

                                          By:     /s/ J. NEAL ARMSTRONG
                                            ------------------------------------
                                            J. Neal Armstrong
                                            Vice President and Chief Financial
                                              Officer


     Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 8 to the Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.


<TABLE>
<CAPTION>
                     SIGNATURE                                    TITLE                      DATE
                     ---------                                    -----                      ----

<C>                                                  <S>                               <C>
              /s/ NASSIB G. CHAMOUN*                 President, Chief Executive        January 27, 2000
- ---------------------------------------------------    Officer and Director
                 Nassib G. Chamoun                     (Principal Executive Officer)

            /s/ J. BRECKENRIDGE EAGLE*               Chairman of the Board of          January 27, 2000
- ---------------------------------------------------    Directors
               J. Breckenridge Eagle

               /s/ J. NEAL ARMSTRONG                 Vice President and Chief          January 27, 2000
- ---------------------------------------------------    Financial Officer (Principal
                 J. Neal Armstrong                     Financial and Accounting
                                                       Officer)

           /s/ BOUDEWIJN L.P.M. BOLLEN*              Director                          January 27, 2000
- ---------------------------------------------------
              Boudewijn L.P.M. Bollen

               /s/ STEPHEN E. COIT*                  Director                          January 27, 2000
- ---------------------------------------------------
                  Stephen E. Coit

                /s/ EDWIN M. KANIA*                  Director                          January 27, 2000
- ---------------------------------------------------
                  Edwin M. Kania

               /s/ LESTER J. LLOYD*                  Director                          January 27, 2000
- ---------------------------------------------------
                  Lester J. Lloyd

               /s/ TERRANCE MCGUIRE*                 Director                          January 27, 2000
- ---------------------------------------------------
                 Terrance McGuire

                /s/ DONALD STANSKI*                  Director                          January 27, 2000
- ---------------------------------------------------
                  Donald Stanski

            *By: /s/ J. NEAL ARMSTRONG
   ---------------------------------------------
                 J. Neal Armstrong
                 Attorney-In-Fact
</TABLE>

                                      II-6
<PAGE>   4

                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
EXHIBIT
  NO.                               DESCRIPTION
- -------                             -----------
<C>         <S>
 1.1**      Form of Underwriting Agreement.
 3.1**      Restated Certificate of Incorporation of the Registrant.
 3.2**      Form of Restated Certificate of Incorporation to be in
            effect upon the closing of the offering.
 3.3**      By-Laws of the Registrant, as amended.
 3.4**      Form of Amended and Restated By-laws of the Registrant to be
            in effect upon the closing of the offering.
 3.5**      Certificate of Amendment to the Restated Certificate of
            Incorporation of the Registrant (to be filed with the
            Secretary of State of the State of Delaware immediately
            prior to the effectiveness of this Registration Statement).
 4.1**      Specimen common stock certificate.
 4.2**      See Exhibits 3.2 and 3.4 for provisions of the Registrant's
            certificate of incorporation and by-laws defining the rights
            of holders of common stock.
 5.1        Opinion of Hale and Dorr LLP.
10.1**      1998 Director Stock Option Plan, as amended.
10.2+**     International Distribution Agreement, dated as of January
            21, 1998, by and between the Registrant and Nihon Kohden
            Corporation.
10.3+**     International License Agreement, dated as of January 21,
            1998, by and between the Registrant and Nihon Kohden
            Corporation.
10.4**      Trademark License Agreement, dated May 25, 1994, by and
            between the Registrant and Aspect Electronics, Inc.
10.5**      License Agreement, dated as of October 31, 1995, by and
            between the Registrant and Siemens Medical Systems, Inc.
10.6+**     Product Agreement, dated May 5, 1999, by and between the
            Registrant and Drager Medizintechnik GmbH.
10.7+**     OEM Development and Purchase Agreement, dated August 6,
            1999, by and between the Registrant and Agilent
            Technologies, Inc. (formerly part of Hewlett-Packard
            Company).
10.8+**     Letter Agreement, dated August 3, 1999, by and between the
            Registrant and Agilent Technologies, Inc. (formerly part of
            Hewlett-Packard Company).
10.9+**     Distribution and License Agreement, dated as of April 1,
            1996, between SpaceLabs Medical, Inc. and the Registrant.
10.10**     Property Lease at 2 Vision Drive, by and between the
            Registrant and Vision Drive, Inc., successor in interest to
            Natick Executive Park Trust No. 2, dated September 8, 1994,
            as amended, together with Subordination, Non-Disturbance and
            Attornment Agreement, by and between the Registrant and
            Teachers Insurance Association of America, dated June 15,
            1995.
10.11**     Lease Extension Agreement, dated as of August 7, 1997, by
            and between the Registrant and Vision Drive, Inc.
10.12**     Loan and Security Agreement, dated as of December 10, 1999,
            by and between the Registrant and Imperial Bank; together
            with an Intellectual Property Security Agreement, dated as
            of December 10, 1999, by and between the Registrant and
            Imperial Bank and a Securities Account Control Agreement,
            dated as of December 10, 1999, by and between the Registrant
            and Imperial Bank.
10.13**     Promissory Note, dated February 18, 1997, as amended on
            April 14, 1997, made in favor of the Registrant by Nassib G.
            Chamoun, together with Pledge Agreement, dated as of
            February 18, 1997, as amended on April 14, 1997, by and
            between the Registrant and Nassib G. Chamoun.
</TABLE>

<PAGE>   5


<TABLE>
<CAPTION>
EXHIBIT
  NO.                               DESCRIPTION
- -------                             -----------
<C>         <S>
10.14**     Promissory Note, dated May 1, 1997, made in favor of the
            Registrant by Nassib G. Chamoun, together with Pledge
            Agreement, dated as of May 1, 1997, by and between the
            Registrant and Nassib G. Chamoun.
10.15**     Promissory Note, dated May 1, 1997, made in favor of the
            Registrant by Nassib G. Chamoun, together with Pledge
            Agreement, dated as of May 1, 1997, by and between the
            Registrant and Nassib G. Chamoun.
10.16**     Form of Promissory Note made in favor of the Registrant by
            certain directors and executive officers, together with Form
            of Pledge Agreement, by and between the Registrant and
            certain directors and executive officers, together with a
            schedule of material terms.
10.17**     Promissory Note, dated September 24, 1997, made in favor of
            the Registrant by Jeffrey Barrett.
10.18**     Promissory Note, dated April 10, 1998, made in favor of the
            Registrant by Jeffrey Barrett, together with Pledge
            Agreement, dated as of April 10, 1998, by and between the
            Registrant and Jeffrey Barrett.
10.19**     Series E Convertible Preferred Stock and Warrant Purchase
            Agreement, dated December 17, 1998, by and among the
            Registrant and the several purchasers named on Schedule I
            thereto.
10.20**     Fourth Amended and Restated Right of First Refusal and
            Co-Sale Agreement, dated December 17, 1998, by and among the
            Registrant and the several parties named on Schedules I, II
            and III thereto.
10.21**     Fourth Amended and Restated Registration Rights Agreement,
            dated December 17, 1998, by and among the Registrant and the
            several purchasers named on the signature pages thereto.
10.22**     Fourth Amended and Restated Voting Agreement, dated December
            17, 1998, by and among the Registrant and the several
            parties named on Schedules I, II and III thereto.
10.23**     Form of Warrant to purchase the Registrant's common stock,
            together with schedule of Warrantholders.
10.24+**    Supplier Agreement, dated August 13, 1999, between Novation,
            LLC and the Registrant.
10.25+**    Medical Products Distribution Agreement, dated October 1,
            1999, between Hewlett-Packard Company and the Registrant.
10.26+**    OEM Development and Purchase Agreement, dated December 22,
            1999, by and between the Registrant and GE Marquette Medical
            Systems, Inc.
23.1        Consent of Hale and Dorr LLP (contained in Exhibit 5.1).
23.2**      Consent of Arthur Andersen LLP.
24.1**      Power of Attorney.
27.1**      Financial Data Schedule for fiscal year end December 31,
            1998.
27.2**      Financial Data Schedule for fiscal year end December 31,
            1999.
</TABLE>


- ------------
 + Confidential treatment has been requested as to certain portions of this
   Exhibit pursuant to Rule 406 promulgated under the Securities Act. Such
   portions have been omitted and filed separately with the Securities and
   Exchange Commission.

** Previously filed.

<PAGE>   1
                                                                     EXHIBIT 5.1


                               HALE AND DORR LLP
                       C O U N S E L L O R S  A T  L A W

                  60 STATE STREET, BOSTON, MASSACHUSETTS 02109
                         617-526-6000 * FAX 617-526-5000


                                January 27, 2000

Aspect Medical Systems, Inc.
Two Vision Drive
Natick, Massachusetts 01760


         RE:      Registration Statement on Form S-1
                  ----------------------------------

Ladies and Gentlemen:

         This opinion is furnished to you in connection with a Registration
Statement on Form S-1, as amended (Commission File No. 333-86295) (the
"Registration Statement") filed with the Securities and Exchange Commission (the
"Commission") under the Securities Act of 1933, as amended (the "Securities
Act"), for the registration of 4,025,000 shares of Common Stock, $0.01 par value
per share (the "Shares"), of Aspect Medical Systems, Inc., a Delaware
corporation (the "Company"), including 525,000 Shares issuable upon exercise of
an over-allotment option granted by the Company.

         The Shares are to be sold by the Company pursuant to an underwriting
agreement (the "Underwriting Agreement") to be entered into by and among the
Company and Morgan Stanley & Co. Incorporated, Deutsche Bank Securities, Inc.
and U.S. Bancorp Piper Jaffray, Inc., as representatives of the several
underwriters named in Schedule I to the Underwriting Agreement, the form of
which has been filed as Exhibit 1.1 to the Registration Statement.

         We are acting as counsel for the Company in connection with the issue
and sale by the Company of the Shares. We have examined signed copies of the
Registration Statement as filed with the Commission. We have also examined and
relied upon the Underwriting Agreement, minutes of meetings of the stockholders
and the Board of Directors of the Company as provided to us by the Company,
stock record books of the Company as provided to us by the Company, the
Certificate of Incorporation and By-Laws of the Company, each as restated and/or
amended to date, and such other documents as we have deemed necessary for
purposes of rendering the opinions hereinafter set forth.

         In our examination of the foregoing documents, we have assumed the
genuineness of all signatures, the authenticity of all documents submitted to us
as originals, the conformity to original documents of all documents submitted to
us as copies, the authenticity of the originals of such latter documents and the
legal competence of all signatories to such documents.



WASHINGTON,  DC                 BOSTON,  MA                        LONDON,  UK*
- --------------------------------------------------------------------------------
              HALE AND DORR LLP INCLUDES PROFESSIONAL CORPORATIONS
  *BROBECK HALE AND DORR INTERNATIONAL (AN INDEPENDENT JOINT VENTURE LAW FIRM)
<PAGE>   2
Aspect Medical Systems, Inc.
January 27, 2000
Page 2


         We assume that the appropriate action will be taken, prior to the offer
and sale of the Shares in accordance with the Underwriting Agreement, to
register and qualify the Shares for sale under all applicable state securities
or "blue sky" laws.

         We express no opinion herein as to the laws of any state or
jurisdiction other than the state laws of the Commonwealth of Massachusetts, the
Delaware law and the federal laws of the United States of America. To the extent
that any other laws govern the matters as to which we are opining herein, we
have assumed that such laws are identical to the state laws of the Commonwealth
of Massachusetts, and we are expressing no opinion herein as to whether such
assumption is reasonable or correct.

         Based upon and subject to the foregoing, we are of the opinion that the
Shares have been duly authorized for issuance and, when the Shares are issued
and paid for in accordance with the terms and conditions of the Underwriting
Agreement, the Shares will be validly issued, fully paid and nonassessable.

         It is understood that this opinion is to be used only in connection
with the offer and sale of the Shares while the Registration Statement is in
effect.

         Please note that we are opining only as to the matters expressly set
forth herein, and no opinion should be inferred as to any other matters. This
opinion is based upon currently existing statutes, rules, regulations and
judicial decisions, and we disclaim any obligation to advise you of any change
in any of these sources of law or subsequent legal or factual developments which
might affect any matters or opinions set forth herein.

         We hereby consent to the filing of this opinion with the Commission as
an exhibit to the Registration Statement in accordance with the requirements of
Item 601(b)(5) of Regulation S-K under the Securities Act and to the use of our
name therein and in the related Prospectus under the caption "Legal Matters." In
giving such consent, we do not hereby admit that we are in the category of
persons whose consent is required under Section 7 of the Securities Act or the
rules and regulations of the Commission.

                                          Very truly yours,

                                          /s/ Hale and Dorr LLP

                                          HALE AND DORR LLP



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