ASPEN TECHNOLOGY INC /MA/
S-8, 1998-01-20
COMPUTER PROGRAMMING SERVICES
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<PAGE>   1
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 20, 1998


                                                           Registration No. 333-


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933


                             ASPEN TECHNOLOGY, INC.
             (Exact Name of Registrant as Specified in Its Charter)

     MASSACHUSETTS                                 04-2739697
(State or Other Jurisdiction of                   (I.R.S. Employer
Incorporation or Organization)                     Identification No.)

                 TEN CANAL PARK, CAMBRIDGE, MASSACHUSETTS 02141
               (Address of Principal Executive Offices) (Zip Code)


            ASPEN TECHNOLOGY, INC. 1998 EMPLOYEE STOCK PURCHASE PLAN
                            (Full Title of the Plan)

                                LAWRENCE B. EVANS
                     Chairman of the Board of Directors and
                            Chief Executive Officer
                             ASPEN TECHNOLOGY, INC.
                                 Ten Canal Park
                         Cambridge, Massachusetts 02141
                     (Name and Address of Agent for Service)

                                 (617) 949-1000
          (Telephone Number, Including Area Code, of Agent for Service)

                                 With copies to:

       STEPHEN J. DOYLE, ESQ.                       MARK L. JOHNSON, ESQ.
 Vice President and General Counsel               FOLEY, HOAG & ELIOT LLP
       ASPEN TECHNOLOGY, INC.                      One Post Office Square
           Ten Canal Park                       Boston, Massachusetts 02109
   Cambridge, Massachusetts 02141                      (617) 832-1000
           (617) 949-1000



<TABLE>
<CAPTION>
                         CALCULATION OF REGISTRATION FEE
===================================================================================================================
               Title of                     Amount             Proposed               Proposed         Amount of
           Securities to be                 to be          Maximum Offering       Maximum Aggregate   Registration
              Registered                  Registered     Price Per Share(2)(3)    Offering Price(2)       Fee
- -------------------------------------------------------------------------------------------------------------------
<S>                                    <C>                      <C>                  <C>                 <C>
Common Stock, $.10 par value(1)        1,000,000 shares         $30.25               $30,250,000         $7,586
===================================================================================================================
</TABLE>

(1)      Each share of Common Stock will be accompanied by one Right to purchase
         Series A Participating Cumulative Preferred Stock of the Registrant.
(2)      Estimated solely for the purpose of determining the registration fee. 
(3)      In accordance with Rules 457(c) and (h) under the Securities Act of
         1933, the calculation is based on 85% of the average of the high and
         low sale prices reported in the consolidated reporting system of the
         Nasdaq National Market on January 12, 1998.
<PAGE>   2
                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.    INCORPORATION OF DOCUMENTS BY REFERENCE.

           The following documents heretofore filed by Aspen Technology, Inc.
(the "Company") with the Securities and Exchange Commission (the "Commission")
pursuant to the Securities Exchange Act of 1934, as amended (the "Exchange Act")
are incorporated herein by reference:

           (1)    the Company's Annual Report on Form 10-K for the fiscal year
                  ended June 30, 1997, filed on September 29, 1997 pursuant to
                  Section 12 of Exchange Act;

           (2)    the Company's Quarterly Report on Form 10-Q for the quarterly
                  period ended September 30, 1997, filed on November 14, 1997
                  pursuant to Section 13 of the Exchange Act;

           (3)    the Company's Current Report on Form 8-K dated October 9,
                  1997, filed on October 10, 1997 pursuant to Section 13 of the
                  Exchange Act;

           (4)    the Company's definitive Proxy Statement dated October 29,
                  1997, filed on December 1, 1997 pursuant to Section 14 of
                  the Exchange Act; 

           (5)    the description of the Company's Common Stock contained in the
                  Registration Statement on Form 8-A filed on September 6, 1996
                  under Section 12 of the Exchange Act; and

           (6)    the description of the Company's Rights to purchase Series A
                  Participating Cumulative Preferred Stock contained in the
                  Registration Statement on Form 8-A filed on October 10, 1997
                  under Section 12 of the Exchange Act.

           All reports and other documents filed by the Company pursuant to
Section 13(a), 13(c), 14 or 15(d) of the Exchange Act, on or after the date of
this Registration Statement and prior to the filing of a post-effective
amendment 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 the filing of such reports and documents.


ITEM 4.    DESCRIPTION OF SECURITIES.

           Not applicable.


ITEM 5.    INTERESTS OF NAMED EXPERTS AND COUNSEL.

           Not applicable.


                                      II-1
<PAGE>   3
ITEM 6.    INDEMNIFICATION OF DIRECTORS AND OFFICERS.

           Section 67 of Chapter 156B of the Massachusetts General Laws provides
a statutory framework covering indemnification of directors and officers against
liabilities and expenses arising out of legal proceedings brought against them
by reason of their status or service as directors or officers. In addition,
Article VII of the Company's By-Laws provides for indemnification of directors,
officers and employees of the Company. Section 67 and the Company's By-Laws
generally provide that a director, officer or employee of the Company shall be
indemnified by the Company for all expenses and liabilities of legal proceedings
brought against him/her by reason of his/her status or service as a director,
officer or employee unless the director, officer or employee is adjudged not to
have acted in good faith in the reasonable belief that his/her action was in the
best interest of the Company or, to the extent that such matter relates to
service with respect to an employee benefit plan, in the best interests of the
participants or beneficiaries of such plan The Company's Restated Articles of
Organization also incorporate certain provisions permitted under the
Massachusetts General Laws relating to the liability of directors. The
provisions eliminate a director's liability for monetary damages for a breach of
fiduciary duty, including gross negligence, except in circumstances involving
certain wrongful acts, such as the breach of a director's duty of loyalty or
acts or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law or authorization of distributions in violation of the
Restated Articles of Organization or of loans to officers or directors of the
Company or any transaction from which the director derived an improper personal
benefit. These provisions do not eliminate a director's duty of care. Moreover,
the provisions do not apply to claims against a director for violations of
certain laws, including federal securities laws.


ITEM 7.    EXEMPTION FROM REGISTRATION CLAIMED.

           Not applicable.


ITEM 8.    EXHIBITS.

           The following exhibits are filed as part of this Registration
           Statement:

           4.1    Restated Articles of Organization of the Company, as amended

           4.2    By-Laws of the Company (incorporated by reference to Exhibit
                  3.3 to the Company's Registration Statement on Form S-1 of the
                  Company, Registration No. 33-83916, filed with the Commission
                  on September 13, 1994)

           4.3    Specimen certificate representing Common Stock of the Company
                  (incorporated by reference to Exhibit 4.1 to the Company's
                  Registration Statement on Form S-1, Registration No. 33-83916,
                  filed with the Commission on September 13, 1994)

           4.4    Rights Agreement dated as of October 9, 1997, between the
                  Company and American Stock Transfer and Trust Company, as
                  Rights Agent (incorporated by reference to Exhibit 1 to the
                  Company's Registration Statement on Form 8-A, File No.
                  0-24786, filed with the Commission on October 10, 1997)


                                      II-2
<PAGE>   4

       4.5    Specimen certificate representing Rights to purchase Series A
              Participating Cumulative Preferred Stock of the Company (included
              as exhibit B to the Rights Agreement referenced in Exhibit 4.4)

       5.1    Opinion of Foley, Hoag & Eliot LLP

       10.1   Aspen Technology, Inc. 1998 Employee Stock Purchase Plan

       23.1   Consent of Arthur Andersen LLP

       23.2   Consent of Foley, Hoag & Eliot LLP (included in Exhibit 5.1)

       24.1   Power of Attorney (contained on the signature pages to this
              Registration Statement)


ITEM 9.  UNDERTAKINGS.

       1.     The undersigned Registrant hereby undertakes:

              (a) 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 (i) and (ii) above 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 Exchange Act
          that are incorporated by reference herein.

              (b) 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 herein, and the offering of such securities at that time shall
          be deemed to be the initial bona fide offering thereof.

              (c) 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.

          2. 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 pursuant to Section 13(a) or 

                                      II-3
<PAGE>   5
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 this Registration Statement shall be
deemed to be a new registration statement relating to the securities offered
herein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

           3. 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 Commission such
indemnification is against public policy as expressed in the Securities Act of
1933 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.


                                      II-4
<PAGE>   6
                                   SIGNATURE

           Pursuant to the requirements of the Securities Act of 1933, the
Registrant 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 Cambridge, Massachusetts, on this fifteenth day of
January, 1998.


                                 ASPEN TECHNOLOGY, INC.


                                 By: /s/ Lawrence B. Evans
                                    ----------------------------------------
                                    Lawrence B. Evans
                                    Chairman of the Board of Directors
                                      and Chief Executive Officer


                                POWER OF ATTORNEY

           KNOW ALL MEN BY THESE PRESENTS that each individual whose signature
appears below constitutes and appoints Lawrence B. Evans, Mary A. Palermo and
Stephen J. Doyle, and each of them, true and lawful attorneys-in-fact and agents
with full power of substitution, for and in name, place and stead, in any and
all capacities, to sign any and all amendments (including post-effective
amendments) to this Registration Statement, and to file the same, with all
exhibits thereto, and all documents in connection therewith, with the Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, full power and authority to do and perform each and every act and
thing which they, or any of them, may deem necessary or advisable to be done in
connection with this Registration Statement, as fully to all intents and
purposes as he or she might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them, or any
substitute or substitutes for him, any or all of them, may lawfully do or cause
to be done by virtue hereof.

           Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons, in the
capacities indicated, as of this fifteenth day of January, 1998.

SIGNATURE                        TITLE


 /s/ LAWRENCE B. EVANS           Chairman of the Board of Directors and Chief
- ----------------------------     Executive Officer (Principal Executive Officer)
LAWRENCE B. EVANS


 /s/ MARY A. PALERMO             Executive Vice President (Principal Accounting
- ----------------------------     Officer and Principal Financial Officer)
MARY A. PALERMO

 /s/ JOSEPH F. BOSTON            Director
- ----------------------------     
JOSEPH F. BOSTON


                                      II-5
<PAGE>   7
SIGNATURE                        TITLE


 /s/ GRESHAM T. BREBACH, JR.     Director
- ------------------------------   
GRESHAM T. BREBACH, JR.


 /s/ DOUGLAS R. BROWN            Director
- ------------------------------  
DOUGLAS R. BROWN


 /s/ JOAN C. MCARDLE             Director 
- ------------------------------   
JOAN C. MCARDLE


 /s/ ALISON ROSS                 Director
- ------------------------------   
ALISON ROSS


                                      II-6
<PAGE>   8
                                  EXHIBIT INDEX

Exhibit No.       Description

      4.1         Restated Articles of Organization of Aspen Technology, Inc.,
                  as amended

      4.2         By-Laws of Aspen Technology, Inc. (incorporated by reference
                  to Exhibit 3.3 to Aspen Technology, Inc.'s Registration
                  Statement on Form S-1, Registration No. 33-83916, filed with
                  the Securities and Exchange Commission on September 13, 1994)

      4.3         Specimen certificate representing Common Stock of Aspen
                  Technology, Inc. (incorporated by reference to Exhibit 4.1 to
                  Aspen Technology, Inc.'s Registration Statement on Form S-1,
                  Registration No. 33-83916, filed with the Securities and
                  Exchange Commission on September 13, 1994)

      4.4         Rights Agreement dated as of October 9, 1997, between Aspen
                  Technology, Inc. and American Stock Transfer and Trust
                  Company, as Rights Agent (incorporated by reference to Exhibit
                  1 to Aspen Technology, Inc.'s Registration Statement on Form
                  8-A, File No. 0-24786, filed with the Securities and Exchange
                  Commission on October 10, 1997)

      4.5         Specimen certificate representing Rights to purchase Series A
                  Participating Cumulative Preferred Stock of Aspen Technology,
                  Inc. (included as exhibit B to the Rights Agreement referenced
                  in Exhibit 4.4)

      5.1         Opinion of Foley, Hoag & Eliot LLP

     10.1         Aspen Technology, Inc. 1998 Employee Stock Purchase Plan

     23.1         Consent of Arthur Andersen LLP

     23.2         Consent of Foley, Hoag & Eliot LLP (included in Exhibit 5.1)

     24.1         Power of Attorney (contained on the signature pages to this
                  Registration Statement)


<PAGE>   1
                                                                     Exhibit 4.1
                                                          FEDERAL IDENTIFICATION
                                                                  NO. 04-2739697

                        THE COMMONWEALTH OF MASSACHUSETTS

                             MICHAEL JOSEPH CONNOLLY
                               SECRETARY OF STATE
                    ONE ASHBURTON PLACE, BOSTON, MASS. 02108

                        RESTATED ARTICLES OF ORGANIZATION

                     General Laws, Chapter 156B, Section 74

     This certificate must be submitted to the Secretary of the Commonwealth
within sixty days after the date of the vote of stockholders adopting the
restated articles of organization. The fee for filing this certificate is
prescribed by General Laws, Chapter 156B, Section 114. Make check payable to the
Commonwealth of Massachusetts.

     We, Joseph F. Boston and Richard M. Harter                  , President and
                                                                        Clerk of

                             Aspen Technology, Inc.
- --------------------------------------------------------------------------------
                              (Name of Corporation)

located at Ten Canal Park, Cambridge, MA 02141 do hereby certificate that the
following restatement of the articles of organization of the corporation was
duly adopted at a meeting held on October 5, 1994, by vote of (See Continuation
Page 1) being at least two-thirds of each class of stock outstanding and
entitled to vote and of each class or series of stock adversely affected
thereby:

     1.   The name by which the corporation shall be known as: Aspen Technology,
          Inc.

     2.   The purposes for which the corporation is formed are as follows: To
          design and market computer software programs, and in general to carry
          on any business permitted to corporations under Chapter 156B of the
          General Laws as now in effect or as hereafter amended, or any
          successor provision to such Chapter.

<PAGE>   2


     3.   The total number of shares and the par value, if any, of each class of
          stock which the corporation is authorized to issue is as follows:

<TABLE>
<CAPTION>
                     WITHOUT PAR VALUE               WITH PAR VALUE
                     -----------------               --------------
CLASS OF STOCK       NUMBER OF SHARES    NUMBER OF SHARES           PAR VALUE
- --------------       ----------------    ----------------           ---------
<S>                                          <C>                      <C>  
Preferred                                    10,000,000               $0.10
Common                                       15,000,000               $0.10
</TABLE>

     *4.  If more than one class is authorized, a description of each of the
          different classes of stock with, if any, the preferences, voting
          powers, qualifications, special or relative rights or privileges as to
          each class thereof and any series now established:

          The Corporation shall have authority to issue 25,000,000 shares of
          capital stock of which 15,000,000 shares shall be common stock in the
          amount as set forth below and 10,000,000 shares shall be preferred
          stock in the amount as set forth below:

<TABLE>
<CAPTION>
          Classification                No. of shares             Par Value
          --------------                -------------             ---------
          <S>                            <C>                        <C>  
          Common Stock                   15,000,000                 $0.10
          Preferred Stock                10,000,000                 $0.10
</TABLE>

          (See Continuation Page 2)

     *5.  The restrictions, if any, imposed by the articles of organization upon
          the transfer of shares of stock of any class are as follows: None



     *6.  Other lawful provisions, if any, for the conduct and regulation of the
          business and affairs of the corporation, for its voluntary
          dissolution, or for limiting, defining, or regulating the powers of
          the corporation, or of its directors or stockholders, or of any class
          of stockholders:
          
          Meetings of the stockholders may be held anywhere within the United
          States. The directors may make, amend, or repeal the By-Laws, in whole
          or in part, except with respect to any provision thereof which by law
          or the By-laws requires action by the stockholders. The Corporation
          may be a partner in any business enterprise which it would have power
          to conduct by itself.

          (See Continuation Page 3)


<PAGE>   3

                               CONTINUATION PAGE 1

                        Restated Articles of Organization

                             Aspen Technology, Inc.



2,616,130 shares of Common Stock out of 2,830,197 shares outstanding,

5,000 shares of Class A Convertible Preferred Stock out of 5,000 shares
outstanding,

101,986 shares of Class B Convertible Preferred Stock out of 101,986 shares
outstanding, and

250,000 shares of Series C-1 Preferred Stock out of 250,000 shares outstanding.


<PAGE>   4
                               CONTINUATION PAGE 2

                        Restated Articles of Organization

                             Aspen Technology, Inc.


The shares of preferred stock may be issued from time to time in one or more
classes or series. The Board of Directors is hereby authorized to establish and
designate the different class or series, and to fix and determine preferences,
voting powers, qualifications, and special or relative rights or privileges
thereof and such designations as shall be stated in a vote or votes providing
for the issue of such class or series adopted by the Board of Directors, which
preferences, voting powers, qualifications, and special or relative rights or
privileges need not be uniform among class or series. Any of the preferences,
voting powers, qualification and special or relative rights or privileges of any
such class or series of stock may be made dependent upon facts ascertainable
outside the vote or votes providing for the issue or such stock adopted by the
Board of Directors, provided that the manner in which such facts shall operate
upon the preferences, voting powers, qualifications, and special or relative
rights or privileges of such class or series of stock is clearly and expressly
set forth in the vote or votes providing for the issue of such class or series
adopted by the Board of Directors. Prior to the issuance of any shares of the
class or series having terms so determined by the Board of Directors other than
a reissue of shares as shares of the same class and series, the Corporation
shall submit to the Secretary of State a certificate signed by the president or
a Vice president and by the Clerk or an Assistant Clerk setting forth the text
of the vote or votes of the Board of Directors determining the terms of the
class or series or the number of votes and a certificate that such vote or votes
were duly adopted by the Board of Directors.



<PAGE>   5

                               CONTINUATION PAGE 3

                        Restated Articles of Organization

                             Aspen Technology, Inc.


No director shall be personally liable to the corporation or to any of its
stockholders for monetary damages for any breach of fiduciary duty by such
director as a director notwithstanding any provision of law imposing such
liability; provided, however, that, to the extent required from time to time by
applicable law, this provision shall not eliminate the liability of a director,
to the extent such liability is provided by applicable law, (a) for any breach
of the director's duty of loyalty to the corporation or its stockholders, (b)
for acts or omissions not in good faith which involve intentional misconduct or
a knowing violation of law, (c) under Section 61 or Section 62 of the Business
Corporation Law of the Commonwealth of Massachusetts, or (d) for any transaction
from which the director derived an improper personal benefit. No amendment to or
repeal of this paragraph shall apply to or have any effect on the liability or
alleged liability of any director for or with respect to any acts or omissions
of such director occurring prior to the effective date of such amendment or
repeal.

The number of directors shall be determined in accordance with the By-laws. The
directors shall be divided into three classes by the Board, as nearly equal in
number as may be, the term of office of those of the first class to expire at
the first annual meeting of stockholders after their election, the term of
office of those of the second class to expire at the second annual meeting of
stockholders after their election, and the term of office of those of the third
class to expire at the third annual meeting of stockholders after their
election, all directors to serve until their successor are elected and
qualified. At each annual election held thereafter, the directors to succeed
those whose terms expire shall be elected for a term of office to expire at the
third annual meeting of stockholders after their election and after their
successors are elected and qualified.


<PAGE>   6

     *We further certify that the foregoing restated articles of organization
effect no amendments to the articles of organization of the corporation as
heretofore amended, except amendments to the following articles 3, 4 and 6
                                                               ---------------- 

                   Briefly describe amendments in space below:

A.   ARTICLE III IS AMENDED TO INCREASE THE NUMBER OF AUTHORIZED SHARES OF
     COMMON STOCK OF THE COMPANY AND TO INCREASE THE NUMBER OF AUTHORIZED SHARES
     OF PREFERRED STOCK OF THE COMPANY.

B.   ARTICLE IV IS AMENDED TO ELIMINATE THE CLASS A, CLASS B AND SERIES C-1
     PREFERRED STOCK OF THE COMPANY.

C.   ARTICLE VI IS AMENDED TO PROVIDE FOR THE EXCULPATION OF DIRECTORS.


IN WITNESS WHEREOF AND UNDER THE PENALTIES OF PERJURY, we have hereto signed our
names this 1st day of November in the year 1994.

/s/ Joseph F. Boston                                                   President

/s/ Richard M. Harter                                                      Clerk


<PAGE>   7

                        THE COMMONWEALTH OF MASSACHUSETTS

                        RESTATED ARTICLES OF ORGANIZATION
                    (General Laws, Chapter 156B, Section 74)

                              I hereby approve the within restated articles of
                         organization and, the filing fee in the amount of
                         $14,245.00 having been paid, said articles are deemed
                         to have been filed with me this 1st day of November,
                         1994.

                                                     /s/ Michael Joseph Connolly
                                                     MICHAEL JOSEPH CONNOLLY
                                                     Secretary of State




                         TO BE FILLED IN BY CORPORATION
            PHOTOCOPY OF RESTATED ARTICLES OF ORGANIZATION TO BE SENT

            TO:   Richard M. Harter, Esq.
                  Bingham, Dana & Gould
                  150 Federal Street
                  Boston, MA  02110

            Telephone    (617) 951-8415


<PAGE>   8

                                                          FEDERAL IDENTIFICATION
                                                                  NO. 04-2739697

                        THE COMMONWEALTH OF MASSACHUSETTS

                             William Francis Galvin
                          Secretary of the Commonwealth
              One Ashburton Place, Boston, Massachusetts 02108-1512

                              ARTICLES OF AMENDMENT
                    (General Laws, Chapter 156B, Section 72)



We,           Joseph F. Boston,                                      , President

and           Stephen J. Doyle                                , Assistant Clerk,

of            Aspen Technology, Inc.
- --------------------------------------------------------------------------------
                           (Exact name of corporation)


located at: Ten Canal Park, Cambridge, MA 02141
- --------------------------------------------------------------------------------
                (Street address of corporation in Massachusetts)

certify that these Articles of Amendment affecting articles numbered:

                             Article 3 and Article 4
- --------------------------------------------------------------------------------
          (Number those articles 1, 2, 3, 4, 5, and/or 6 being amended)

of the Articles of Organization were duly adopted at a meeting held on December
16, 1996, by vote of:

5,241,622 shares of Common of 9,729,730 shares outstanding,

being at least a majority of each type, class or series outstanding and entitled
to vote thereon.

          That Section 3 of the Corporation's Articles of Organization is hereby
          amended to read in its entirety as follows:

          3.   The total number of shares and the par value, if any, of each
               class of capital stock which the corporation 

                           (see continuation page 1)


<PAGE>   9


To change the number of shares and the par value (if any) of any type, class or
series of stock which the corporation is authorized to issue, fill in the
following:

The total presently authorized is:

<TABLE>
<CAPTION>
- ------------------------------------- -------------------------------------------------
       WITHOUT PAR VALUE STOCKS                      WITH PAR VALUE STOCKS
- ------------------- ----------------- ---------------- ----------------- --------------
TYPE                NUMBER OF SHARES       TYPE        NUMBER OF SHARES     PAR VALUE
- ------------------- ----------------- ---------------- ----------------- --------------
<S>                 <C>               <C>              <C>                  <C>
Common:                               Common:          15,000,000           .10
- ------------------- ----------------- ---------------- ----------------- --------------

- ------------------- ----------------- ---------------- ----------------- --------------
Preferred:                            Preferred:       10,000,000           .10
- ------------------- ----------------- ---------------- ----------------- --------------

- ------------------- ----------------- ---------------- ----------------- --------------
</TABLE>



Change the total authorized to:

<TABLE>
<CAPTION>
- ------------------------------------- -------------------------------------------------
       WITHOUT PAR VALUE STOCKS                      WITH PAR VALUE STOCKS
- ------------------- ----------------- ---------------- ----------------- --------------
TYPE                NUMBER OF SHARES       TYPE        NUMBER OF SHARES     PAR VALUE
- ------------------- ----------------- ---------------- ----------------- --------------
<S>                 <C>               <C>              <C>                  <C>
Common:                               Common:          40,000,000           .10
- ------------------- ----------------- ---------------- ----------------- --------------

- ------------------- ----------------- ---------------- ----------------- --------------
Preferred:                            Preferred:       10,000,000           .10
- ------------------- ----------------- ---------------- ----------------- --------------

- ------------------- ----------------- ---------------- ----------------- --------------
</TABLE>


<PAGE>   10


                               CONTINUATION PAGE 1

     is authorized to issue as follows:

<TABLE>
<CAPTION>
                                                          WITH PAR VALUE
             WITHOUT PAR VALUE
     CLASS OF STOCK    NUMBER OF SHARES          NUMBER OF SHARES   PAR VALUE
     <S>               <C>                       <C>                <C>  
     Preferred                                   10,000,000         $0.10
     Common                                      40,000,000         $0.10
</TABLE>


     That Section 4 of the Corporation's Articles of Organization is hereby
     amended to read in its entirety as follows:

4.   If more than one class is authorized, a description of each of the
     different classes of stock, with, if any, the preferences, voting powers,
     qualifications, special or relative rights or privileges as to each class
     thereof and any series now established:

     The Corporation shall have authority to issue 50,000,000 shares of capital
     stock of which 40,000,000 shares shall be Common Stock in the amount as set
     forth below and 10,000,000 shares shall be preferred stock in the amount
     set forth below:

<TABLE>
<CAPTION>
     CLASSIFICATION             NO. OF SHARES             PAR VALUE
     <S>                        <C>                       <C>  
     Common Stock               40,000,000                $0.10
     Preferred Stock            10,000,000                $0.10
</TABLE>

The shares of preferred stock may be issued from time to time in one or more
classes or series. The Board of Directors is hereby authorized to establish and
designate the different class or series, and to fix and determine preferences,
voting powers, qualifications, and special or relative rights or privileges
thereof and such

                            (see continuation page 2)

The foregoing amendment(s) will become effective when these Articles of
Amendment are filed in accordance with General Laws, Chapter 156B, Section 6
unless these articles specify, in accordance with the vote adopting the
amendment, a later effective date not more than thirty days after such filing in
which event the amendment will become effective on such later date.

Later effective date:

SIGNED UNDER THE PENALTIES OF PERJURY, this 6th day of January, 1997.

/s/ Joseph F. Boston,                                                  President

/s/ Stephen J. Doyle,                                            Assistant Clerk


<PAGE>   11


                               CONTINUATION PAGE 2

designations as shall be stated in a vote or votes providing for the issue of
such class or series adopted by the Board of Directors, which preferences,
voting powers, qualifications, and special or relative rights or privileges need
not be uniform among class or series. Any of the preferences, voting powers,
qualifications, and special or relative rights or privileges of any such class
or series of stock may be made dependent upon facts ascertainable outside the
vote or votes providing for the issue of such stock adopted by the Board of
Directors, provided that the manner in which such facts shall operate upon the
preferences, voting powers, qualifications, and special or relative rights or
privileges of such class or series of stock is clearly and expressly set forth
in the vote or votes providing for the issue of such class or series adopted by
the Board of Directors. Prior to the issuance of any shares of the class or
series having terms so determined by the Board of Directors other than a reissue
of shares as shares of the same class and series, the Corporation shall submit
to the Secretary of State a certificate signed by the President or a Vice
President and by the Clerk or an Assistant Clerk setting forth the text of the
vote or votes of the Board of Directors determining the terms of the class or
series or the number of votes and a certificate that such vote or votes were
duly adopted by the Board of Directors.


<PAGE>   12



                        THE COMMONWEALTH OF MASSACHUSETTS

                              ARTICLES OF AMENDMENT
                    (General Laws, Chapter 156B, Section 72)



                    I hereby approve the within Articles of Amendment, and the
                    filing fee in the amount of $25,100 having been paid, said
                    article is deemed to have been filed with me this 6th day of
                    January, 1997.



                    Effective date:




                                               /s/ William Francis Galvin

                                                 WILLIAM FRANCIS GALVIN
                                             Secretary of the Commonwealth


                                           TO BE FILLED IN BY CORPORATION 
                                           Photocopy of document to be sent to:

                                           Aspen Technology, Inc.
                                           Ten Canal Park
                                           Cambridge, MA 02141
                                           Attn: Karen Hrynyszyn


<PAGE>   13

                                                          FEDERAL IDENTIFICATION
                                                                  NO. 04-2739697

                        THE COMMONWEALTH OF MASSACHUSETTS

                             William Francis Galvin
                          Secretary of the Commonwealth
                    ONE ASHBURTON PLACE, BOSTON, MASS. 02108

                  CERTIFICATE OF VOTE OF DIRECTORS ESTABLISHING
                          A SERIES OF A CLASS OF STOCK

                     General Laws, Chapter 156B, Section 26



We,           Joseph F. Boston,                                 , President, and

              Stephen J. Doyle                                        , Clerk of

                             Aspen Technology, Inc.
- --------------------------------------------------------------------------------
                              (Name of Corporation)


located at Ten Canal Park, Cambridge, MA 02141 do hereby certify that at a
meeting of the directors of the corporation held on October 9, 1997, the
following vote establishing and designating a series of a class of stock and
determining the relative rights and preferences thereof was duly adopted: 

See Continuation Sheet 2A attached hereto.


<PAGE>   14

                              CONTINUATION SHEET 2A

                             ASPEN TECHNOLOGY, INC.

VOTED:  That the Corporation designate and establish 400,000 shares of its
        authorized but unissued Preferred Stock as its Series A Participating
        Cumulative Preferred Stock, par value $.10 per share (the "Series A
        Preferred Stock"); that the rights, preferences, privileges, limitations
        and restrictions that shall be applicable to the shares of Series A
        Preferred Stock, set forth in their entirety in EXHIBIT B attached
        hereto, be, and they hereby are, approved; and that the President or any
        Vice President and the Clerk or any Assistant Clerk of the Corporation
        be, and they hereby are, authorized to execute a Certificate of Vote of
        Directors Establishing a Series of a Class of Stock (the "Certificate of
        Vote of Directors") setting forth such rights, preferences, privileges,
        limitations and restrictions of the Series A Preferred Stock in the name
        of the Corporation, and to file the Certificate of Vote of Directors
        with the Secretary of State of The Commonwealth of Massachusetts and
        such other governmental authorities as may be required by law.


<PAGE>   15

                                                                       EXHIBIT B

                                TERMS OF SERIES A
                            PARTICIPATING CUMULATIVE
                               PREFERRED STOCK OF
                             ASPEN TECHNOLOGY, INC.


     SECTION 1. DESIGNATION AND NUMBER OF SHARES. The shares of such series
shall be designated as "Series A Participating Cumulative Preferred Stock" (the
"Series A Preferred Stock"), par value $.10 per share. The number of shares
initially constituting the Series A Preferred Stock shall be 400,000; PROVIDED,
HOWEVER, that, if more than a total of 400,000 shares of Series A Preferred
Stock shall be issuable upon the exercise of Rights (the "Rights") issued
pursuant to the Rights Agreement dated as of October 9, 1997, between the
Corporation and American Stock Transfer and Trust Company, a limited power
banking trust company licensed by the New York State Banking Authority, as
Rights Agent (the "Rights Agreement"), the Board of Directors of the
Corporation, pursuant to Section 26 of the Business Corporation Law of The
Commonwealth of Massachusetts, shall direct by vote or votes that a certificate
be properly executed, acknowledged, filed and recorded, in accordance with the
provisions of Section 26 thereof, providing for the total number of shares of
Series A Preferred Stock authorized to be issued to be increased (to the extent
that the Articles of Organization then permits) to the largest number of whole
shares (rounded up to the nearest whole number) issuable upon exercise of such
Rights.

     SECTION 2. DIVIDENDS OR DISTRIBUTIONS. (a) Subject to the prior and
superior rights of the holders of shares of any other series of Preferred Stock
or other class of capital stock of the Corporation ranking prior and superior to
the shares of Series A Preferred Stock with respect to dividends, the holders of
shares of the Series A Preferred Stock shall be entitled to receive, when, as
and if declared by the Board of Directors, out of the assets of the Corporation
legally available therefor, (1) quarterly dividends payable in cash on the last
day of each fiscal quarter in each year, or such other dates as the Board of
Directors of the Corporation shall approve (each such date being referred to
herein as a "Quarterly Dividend Payment Date"), commencing on the first
Quarterly Dividend Payment Date after the first issuance of a share or a
fraction of a share of Series A Preferred Stock, in the amount of $1.00 per
whole share (rounded to the nearest cent) less the amount of all cash dividends
declared on the Series A Preferred Stock pursuant to the following clause (2)
since the immediately preceding Quarterly Dividend Payment Date or, with respect
to the first Quarterly Dividend Payment Date, since the first issuance of any
share or fraction of a share of Series A Preferred Stock (the total of which
shall not, in any event, be less than zero) and (2) dividends payable in cash on
the payment date for each cash dividend declared on the Common Stock in an
amount per whole share (rounded to the nearest cent) equal to the Formula Number
(as hereinafter defined) then in effect times the cash dividends then to be paid
on each share of Common Stock. In addition, if the Corporation shall pay any
dividend or make any distribution on the Common Stock payable in assets,
securities or other forms of noncash consideration (other than dividends or
distributions solely in shares of Common Stock), then, in each such case, the
Corporation shall simultaneously pay or make on each outstanding whole


<PAGE>   16

share of Series A Preferred Stock a dividend or distribution in like kind equal
to the Formula Number then in effect times such dividend or distribution on each
share of the Common Stock. As used herein, the "Formula Number" shall be 100;
PROVIDED, HOWEVER, that if at any time after October 9, 1997, the Corporation
shall (i) declare or pay any dividend on the Common Stock payable in shares of
Common Stock or make any distribution on the Common Stock in shares of Common
Stock, (ii) subdivide (by a stock split or otherwise) the outstanding shares of
Common Stock into a larger number of shares of Common Stock or (iii) combine (by
a reverse stock split or otherwise) the outstanding shares of Common Stock into
a smaller number of shares of Common Stock, then in each such event the Formula
Number shall be adjusted to a number determined by multiplying the Formula
Number in effect immediately prior to such event by a fraction, the numerator of
which is the number of shares of Common Stock that are outstanding immediately
after such event and the denominator of which is the number of shares of Common
Stock that are outstanding immediately prior to such event (and rounding the
result to the nearest whole number); and PROVIDED FURTHER, that, if at any time
after October 9, 1997, the Corporation shall issue any shares of its capital
stock in a merger, reclassification, or change of the outstanding shares of
Common Stock, then in each such event the Formula Number shall be appropriately
adjusted to reflect such merger, reclassification or change so that each share
of Series A Preferred Stock continues to be the economic equivalent of a Formula
Number of shares of Common Stock prior to such merger, reclassification or
change.

     (b) The Corporation shall declare a dividend or distribution on the Series
A Preferred Stock as provided in Section 2(a) immediately prior to or at the
same time it declares a dividend or distribution on the Common Stock(other than
a dividend or distribution solely in shares of Common Stock); PROVIDED, HOWEVER,
that, in the event no dividend or distribution (other than a dividend or
distribution in shares of Common Stock) shall have been declared on the Common
Stock during the period between any Quarterly Dividend Payment Date and the next
subsequent Quarterly Dividend Payment Date, a dividend of $1.00 per share on the
Series A Preferred Stock shall nevertheless be payable on such subsequent
Quarterly Dividend Payment Date. The Board of Directors may fix a record date
for the determination of holders of shares of Series A Preferred Stock entitled
to receive a dividend or distribution declared thereon, which record date shall
be the same as the record date for any corresponding dividend or distribution on
the Common Stock.

     (c) Dividends shall begin to accrue and be cumulative on outstanding shares
of Series A Preferred Stock from and after the Quarterly Dividend Payment Date
next preceding the date of original issue of such shares of Series A Preferred
Stock; PROVIDED, HOWEVER, that dividends on such shares which are originally
issued after the record date for the determination of holders of shares of
Series A Preferred Stock entitled to receive a quarterly dividend and on or
prior to the next succeeding Quarterly Dividend Payment Date shall begin to
accrue and be cumulative from and after such Quarterly Dividend Payment Date.
Notwithstanding the foregoing, dividends on shares of Series A Preferred Stock
which are originally issued prior to the record date for the determination of
holders of shares of Series A Preferred Stock entitled to receive a quarterly
dividend on the first Quarterly Dividend Payment Date shall be calculated as if
cumulative from and after the last day of the fiscal quarter next preceding the
date of original issuance of such shares. Accrued but unpaid dividends shall not
bear interest. Dividends paid on the shares of Series A Preferred Stock in an
amount less than the total amount of such dividends at the time


<PAGE>   17


accrued and payable on such shares shall be allocated pro rata on a
share-by-share basis among all such shares at the time outstanding.

     (d) So long as any shares of the Series A Preferred Stock are outstanding,
no dividends or other distributions shall be declared, paid or distributed, or
set aside for payment or distribution, on the Common Stock unless, in each case,
the dividend required by this Section 2 to be declared on the Series A Preferred
Stock shall have been declared.

     (e) The holders of the shares of Series A Preferred Stock shall not be
entitled to receive any dividends or other distributions except as provided
herein.

     SECTION 3. VOTING RIGHTS. The holders of shares of Series A Preferred Stock
shall have the following voting rights:

     (a) Each holder of Series A Preferred Stock shall be entitled to a number
of votes equal to the Formula Number then in effect, for each share of Series A
Preferred Stock held of record on each matter on which holders of the Common
Stock or stockholders generally are entitled to vote, multiplied by the maximum
number of votes per share which any holder of the Common Stock or stockholders
generally then have with respect to such matter (assuming any holding period or
other requirement to vote a greater number of shares is satisfied).

     (b) Except as otherwise provided herein or by applicable law, the holders
of shares of Series A Preferred Stock and the holders of shares of Common Stock
shall vote together as one class for the election of directors of the
Corporation and on all other matters submitted to a vote of stockholders of the
Corporation.

     (c) If, at the time of any annual meeting of stockholders for the election
of directors, the equivalent of six quarterly dividends (whether or not
consecutive) payable on any share or shares of Series A Preferred Stock are in
default, the number of directors constituting the Board of Directors of the
Corporation shall be increased by two. In addition to voting together with the
holders of Common Stock for the election of other directors of the Corporation,
the holders of record of the Series A Preferred Stock, voting separately as a
class to the exclusion of the holders of Common Stock, shall be entitled at said
meeting of stockholders (and at each subsequent annual meeting of stockholders),
unless all dividends in arrears have been paid or declared and set apart for
payment prior thereto, to vote for the election of two directors of the
Corporation, the holders of any Series A Preferred Stock being entitled to cast
a number of votes per share of Series A Preferred Stock equal to the Formula
Number. Until the default in payments of all dividends which permitted the
election of said directors shall cease to exist, any director who shall have
been so elected pursuant to the next preceding sentence may be removed at any
time, either with or without cause, only by the affirmative vote of the holders
of the shares of Series A Preferred Stock at the time entitled to cast a
majority of the votes entitled to be cast for the election of any such director
at a special meeting of such holders called for that purpose, and any vacancy
thereby created may be filled by the vote of such holders. If and when such
default shall cease to exist, the holders of the Series A Preferred Stock shall
be divested of the foregoing special voting rights, subject to revesting in the
event of each and every subsequent like default in


<PAGE>   18

payments of dividends. Upon the termination of the foregoing special voting
rights, the terms of office of all persons who may have been elected directors
pursuant to said special voting rights shall forthwith terminate, and the number
of directors constituting the Board of Directors shall be reduced by two. The
voting rights granted by this Section 3(c) shall be in addition to any other
voting rights granted to the holders of the Series A Preferred Stock in this
Section 3.

     (d) Except as provided herein, in Section 11 or by applicable law, holders
of Series A Preferred Stock shall have no special voting rights and their
consent shall not be required (except to the extent they are entitled to vote
with holders of Common Stock as set forth herein) for authorizing or taking any
corporate action.

     SECTION 4. CERTAIN RESTRICTIONS. (a) Whenever quarterly dividends or other
dividends or distributions payable on the Series A Preferred Stock as provided
in Section 2 are in arrears, thereafter and until all accrued and unpaid
dividends and distributions, whether or not declared, on shares of Series A
Preferred Stock outstanding shall have been paid in full, the Corporation shall
not

          (i) declare or pay dividends on, make any other distributions on, or
     redeem or purchase or otherwise acquire for consideration any shares of
     stock ranking junior (either as to dividends or upon liquidation,
     dissolution or winding up) to the Series A Preferred Stock;

          (ii) declare or pay dividends on or make any other distributions on
     any shares of stock ranking on a parity (either as to dividends or upon
     liquidation, dissolution or winding up) with the Series A Preferred Stock,
     except dividends paid ratably on the Series A Preferred Stock and all such
     parity stock on which dividends are payable or in arrears in proportion to
     the total amounts to which the holders of all such shares are then
     entitled;

          (iii) redeem or purchase or otherwise acquire for consideration shares
     of any stock ranking on a parity (either as to dividends or upon
     liquidation, dissolution or winding up) with the Series A Preferred Stock;
     PROVIDED that the Corporation may at any time redeem, purchase or otherwise
     acquire shares of any such parity stock in exchange for shares of any stock
     of the Corporation ranking junior (either as to dividends or upon
     dissolution, liquidation or winding up) to the Series A Preferred Stock; or

          (iv) purchase or otherwise acquire for consideration any shares of
     Series A Preferred Stock, or any shares of stock ranking on a parity with
     the Series A Preferred Stock, except in accordance with a purchase offer
     made in writing or by publication (as determined by the Board of Directors)
     to all holders of such shares upon such terms as the Board of Directors,
     after consideration of the respective annual dividend rates and other
     relative rights and preferences of the respective series and classes, shall
     determine in good faith will result in fair and equitable treatment among
     the respective series or classes.

     (b) The Corporation shall not permit any subsidiary of the Corporation to
purchase or otherwise acquire for consideration any shares of stock of the
Corporation unless the Corporation


<PAGE>   19

could, under paragraph (a) of this Section 4, purchase or otherwise acquire such
shares at such time and in such manner.

     SECTION 5. LIQUIDATION RIGHTS. Upon the liquidation, dissolution or winding
up of the Corporation, whether voluntary or involuntary, no distribution shall
be made (1) to the holders of shares of stock ranking junior (either as to
dividends or upon liquidation, dissolution or winding up) to the Series A
Preferred Stock unless, prior thereto, the holders of shares of Series A
Preferred Stock shall have received an amount equal to the accrued and unpaid
dividends and distributions thereon, whether or not declared, to the date of
such payment, plus an amount equal to the greater of (x) $10.00 per whole share
or (y) an aggregate amount per share equal to the Formula Number then in effect
times the aggregate amount to be distributed per share to holders of Common
Stock or (2) to the holders of stock ranking on a parity (either as to dividends
or upon liquidation, dissolution or winding up) with the Series A Preferred
Stock, except distributions made ratably on the Series A Preferred Stock and all
other such parity stock in proportion to the total amounts to which the holders
of all such shares are entitled upon such liquidation, dissolution or winding
up.

     SECTION 6. CONSOLIDATION, MERGER, ETC.. In case the Corporation shall enter
into any consolidation, merger, combination or other transaction in which the
shares of Common Stock are exchanged for or changed into other stock or
securities, cash or any other property, then in any such case the then
outstanding shares of Series A Preferred Stock shall at the same time be
similarly exchanged or changed into an amount per share equal to the Formula
Number then in effect times the aggregate amount of stock, securities, cash or
any other property (payable in kind), as the case may be, into which or for
which each share of Common Stock is exchanged or changed. In the event both this
Section 6 and Section 2 appear to apply to a transaction, this Section 6 will
control.

     SECTION 7. NO REDEMPTION; NO SINKING FUND. (a) The shares of Series A
Preferred Stock shall not be subject to redemption by the Corporation or at the
option of any holder of Series A Preferred Stock; PROVIDED, HOWEVER, that the
Corporation may purchase or otherwise acquire outstanding shares of Series A
Preferred Stock in the open market or by offer to any holder or holders of
shares of Series A Preferred Stock.

     (b) The shares of Series A Preferred Stock shall not be subject to or
entitled to the operation of a retirement or sinking fund.

     SECTION 8. RANKING. The Series A Preferred Stock shall rank junior to all
other series of Preferred Stock of the Corporation, unless the Board of
Directors shall specifically determine otherwise in fixing the powers,
preferences and relative, participating, optional and other special rights of
the shares of such series and the qualifications, limitations and restrictions
thereof.

     SECTION 9. FRACTIONAL SHARES. The Series A Preferred Stock shall be
issuable upon exercise of the Rights issued pursuant to the Rights Agreement in
whole shares or in any fraction of a share that is one one-hundredth (1/100th)
of a share or any integral multiple of such fraction which shall entitle the
holder, in proportion to such holder's fractional shares, to receive dividends,


<PAGE>   20

exercise voting rights, participate in distributions and to have the benefit of
all other rights of holders of Series A Preferred Stock. In lieu of fractional
shares, the Corporation, prior to the first issuance of a share or a fraction of
a share of Series A Preferred Stock, may elect (1) to make a cash payment as
provided in the Rights Agreement for fractions of a share other than one
one-hundredth (1/100th) of a share or any integral multiple thereof or (2) to
issue depository receipts evidencing such authorized fraction of a share of
Series A Preferred Stock pursuant to an appropriate agreement between the
Corporation and a depository selected by the Corporation; PROVIDED that such
agreement shall provide that the holders of such depository receipts shall have
all the rights, privileges and preferences to which they are entitled as holders
of the Series A Preferred Stock.

     SECTION 10. REACQUIRED SHARES. Any shares of Series A Preferred Stock
purchased or otherwise acquired by the Corporation in any manner whatsoever
shall be retired and canceled promptly after the acquisition thereof. All such
shares shall upon their cancellation become authorized but unissued shares of
Preferred Stock, without designation as to series until such shares are once
more designated as part of a particular series by the Board of Directors
pursuant to the provisions of Section 2 of Article IV of the Articles of
Incorporation.

     SECTION 11. AMENDMENT. None of the powers, preferences and relative,
participating, optional and other special rights of the Series A Preferred Stock
as provided herein or in the Certificate of Incorporation shall be amended in
any manner which would alter or change the powers, preferences, rights or
privileges of the holders of Series A Preferred Stock so as to affect them
adversely without the affirmative vote of the holders of at least 66-2/3% of the
outstanding shares of Series A Preferred Stock, voting as a separate class;
PROVIDED, HOWEVER, that no such amendment approved by the holders of at least
66-2/3% of the outstanding shares of Series A Preferred Stock shall be deemed to
apply to the powers, preferences, rights or privileges of any holder of shares
of Series A Preferred Stock originally issued upon exercise of the Rights after
the time of such approval without the approval of such holder.

                                    * * * * *


<PAGE>   21


IN WITNESS WHEREOF AND UNDER THE PENALTIES OF PERJURY, we have hereto signed our
names this 9th day of October in the year 1997.


/s/ Joseph F. Boston                                                 , President

/s/ Stephen J. Doyle                                                     , Clerk


<PAGE>   22

                        THE COMMONWEALTH OF MASSACHUSETTS


                  Certificate of Vote of Directors Establishing

                          A Series of a Class of Stock

                    (General Laws, Chapter 156B, Section 26)


                              I hereby approve the within certificate and, the
                         filing fee in the amount of $100.00 having been paid,
                         said certificate is hereby filed this 10th day of
                         October, 1997.





                                               /s/ William Francis Galvin

                                                WILLIAM FRANCIS GALVIN
                                            Secretary of the Commonwealth
                                                 Corporations Division
                                     One Ashburton Place, Boston, MA  02108-1512



                         TO BE FILLED IN BY CORPORATION

                      PHOTO COPY OF CERTIFICATE TO BE SENT

                      TO:       Stephen J. Doyle, Esq.
                                General Counsel
                                Aspen Technology, Inc.
                                Ten Canal Park
                                Cambridge, Massachusetts 02141
                      Telephone (617) 557-0100

<PAGE>   1
                                                                     EXHIBIT 5.1


                             FOLEY, HOAG & ELIOT LLP
                             One Post Office Square
                        Boston, Massachusetts 02109-2170
                            Telephone: (617) 832-1000
                            Facsimile: (617) 832-7000
                                  Telex 940693
                               http://www.fhe.com






                                          January 20, 1998



ASPEN TECHNOLOGY, INC.
Ten Canal Park
Cambridge, Massachusetts  02141

Ladies and Gentlemen:

      We have acted as counsel for Aspen Technology, Inc., a Massachusetts
corporation (the "Company"), in connection with the preparation and filing with
the Securities and Exchange Commission under the Securities Act of 1933, as
amended, of a Registration Statement on Form S-8 (the "Registration Statement")
relating to the offering by the Company of up to 1,000,000 shares (the "Shares")
of the Company's Common Stock, $0.10 par value, issuable pursuant to the Aspen
Technology, Inc. 1998 Employee Stock Purchase Plan (the "Plan").

     In arriving at the opinions expressed below, we have examined and relied
on the following documents:

     (i)    the Registration Statement;

     (ii)   the Plan;

     (iii)  the Restated Articles of Organization of the Company, as amended
            as of the date hereof;

     (iv)   the By-Laws of the Company, as amended as of the date hereof; and

     (v)    the minutes of a meeting of the Board of Directors of the Company
            held on October 9, 1997.

In addition, we have examined and relied on the originals or copies certified or
otherwise identified to our satisfaction of all such other records, documents
and instruments of the Company and such other persons, and we have made such
investigations of law, as we have deemed appropriate as a basis for the opinions
expressed below. We have assumed the genuineness of all signatures and the
authenticity of all documents submitted to us as originals and the conformity to
the original documents of all documents submitted to us as certified or
photostatic copies.
<PAGE>   2
ASPEN TECHNOLOGY, INC.
January 20, 1998
Page Two



      We express no opinion other than as to the laws of the Commonwealth of
Massachusetts.

      Based upon the foregoing, we are of the opinion that:

      1.  The Company has the corporate power necessary for the issuance of 
the Shares under the Plan, as contemplated by the Registration Statement.

      2.  The Shares have been duly authorized and, when issued against payment
of the agreed consideration therefor in accordance with the respective exercise
prices therefor as described in the Plan, will be validly issued, fully paid and
non-assessable.

      We consent to the filing of this opinion as Exhibit 5.1 to the
Registration Statement.


                                        Very truly yours,


                                        FOLEY, HOAG & ELIOT LLP




                                        By /s/ Mark L. Johnson
                                           --------------------------------
                                           A Partner

<PAGE>   1
                                                                    EXHIBIT 10.1



                             ASPEN TECHNOLOGY, INC.

                        1998 EMPLOYEE STOCK PURCHASE PLAN

        1.     Definitions. As used in this 1998 Employee Stock Purchase Plan of
Aspen Technology, Inc., the following terms shall have the meanings respectively
assigned to them below:

        1.1    Beneficiary means the person designated as beneficiary on the
                 Optionee's Membership Agreement or, if no such beneficiary is
                 named, the person to whom the Option is transferred by will or
                 under the applicable laws of descent and distribution.

        1.2    Code means the Internal Revenue Code of 1986, as amended.

        1.3    Committee means the Compensation Committee of the Board of
                 Directors of the Company.

        1.4    Company means Aspen Technology, Inc.

        1.5    Compensation means annual compensation, including commissions,
                 overtime and bonuses for the most recently completed calendar
                 year.

        1.6    Control Group mean the Company and the Related Corporations.

        1.7    Eligible Employee means a person who is eligible under the
                 provisions of Section 7 to receive an Option as of a particular
                 Grant Date.

        1.8    Exercise Date means a date not more than 27 months after a Grant
                 Date, as determined by the Committee, on which Options must, if
                 ever, be executed.

        1.9    Grant Date means a date specified by the Committee on which
                 Options are to be granted to Eligible Employees.

        1.10   Market Value means, as of a particular date, the value as
                 determined by the Committee in accordance with applicable
                 provisions of the Code and Treasury Department rulings and
                 regulations thereunder or, if applicable, the closing price of
                 the Stock on the NASDAQ National Market System, as reported in
                 The Wall Street Journal.
<PAGE>   2
                                      -2-


   1.11   Membership Agreement means an agreement whereby an Optionee
            authorizes the Company to withhold payroll deductions from his or
            her Compensation.

   1.12   Option means an option to purchase shares of Stock granted under
            the Plan.

   1.13   Optionee means an Eligible Employee to whom an Option is granted.

   1.14   Plan means this 1998 Employee Stock Purchase Plan of the Company.

   1.15   Related Corporation means any corporation which is a parent
            corporation of the Company, as defined in Section 424(e) of the
            Code, and any corporation controlled by that parent corporation
            or the Company.

   1.16   Stock means common stock, $0.10 par value, of the Company.

   2.     Purpose of the Plan. The Plan is intended to encourage ownership of
Stock by employees of the Company and to provide additional incentive for the
employees to promote the success of the business of the Company. It is intended
that the Plan shall be an "employee stock purchase plan" within the meaning of
Section 423 of the Code.

   3.     Term of the Plan. The Plan shall become effective on January 1,
1998. No option shall be granted under the Plan after September 30, 2007.

   4.      Administration of the Plan. The Plan shall be administered by the
Committee, which shall determine from time to time whether to grant Options
under the Plan, shall specify which dates shall be Grant Dates and Exercise
Dates, shall determine the Market Value of the Stock, and shall fix the maximum
percentage of each Optionee's Compensation which may be withheld for the purpose
of purchasing shares of Stock; provided that the maximum percentage shall not
exceed ten percent. The Committee shall have authority to interpret the Plan, to
prescribe, amend and rescind rules and regulations relating to the Plan, to
determine the terms of Options granted under the Plan, and to make all other
determinations necessary or advisable for the administration of the Plan.

   5.     Termination and Amendment of Plan. The Committee may terminate or
amend the Plan at any time; provided however, that the Committee may not,
without approval by the holders of a majority of the shares of Stock, increase
the maximum number of shares of Stock purchasable under the Plan,
<PAGE>   3
                                      -3-


change the description of employees or classes of employees eligible to receive
Options, change the manner of determining the exercise price of Options, or
extend the period during which Options may be granted or exercised. No
termination of or amendment to the Plan may adversely affect the rights of an
Optionee with respect to any Option held by the Optionee as of the date of such
termination or amendment.

         6.    Shares of Stock Subject to the Plan. No more than an aggregate of
1,000,000 shares of Stock may be issued or delivered pursuant to the exercise of
Options granted under the Plan, subject to adjustment to reflect events
described in Section 9.8. Shares to be delivered upon the exercise of Options
may be either shares of Stock which are authorized but unissued or shares of
Stock held by the Company in its treasury. If an Option expires or terminates
for any reason without having been exercised in full, the unpurchased shares
subject to the Option shall become available for other Options granted under the
Plan. The Company shall, at all times during which Options are outstanding,
reserve and keep available shares of Stock, sufficient to satisfy such Options,
and shall pay all fees and expenses incurred by the Company in connection there
with. In the event of any capital change in the outstanding Stock as
contemplated by Section 9.8, the number of shares of Stock reserved and kept
available by the Company shall be appropriately adjusted.

         7.    Persons Eligible to Receive Options. Each employee of each 
specified member of the Controlled Group shall be granted an Option on a Grant
Date on which the employee meets all of the following requirements:

         7.1   The employee has been employed by the Controlled Group for at 
                  least one month and is customarily so employed for at least
                  twenty hours per week and for more than five months per
                  calendar year.

         7.2   The employee will not, after grant of the Option, own stock
                  possessing five percent or more of the total combined voting
                  power or value of all classes of stock of the Company or of
                  any Related Corporation. For purposes of this paragraph (b),
                  the rules of Section 424(d) of the Code shall apply in
                  determining the stock ownership of the employee, and stock
                  which the employee may purchase under outstanding options
                  shall be treated as stock owned by the employee.

         7.3   Upon grant of the Option, the employee's rights to purchase stock
                  under all employee stock purchase plans (as defined in Section
                  423(b) of the Code) of the Company and its Related
                  Corporations will not accrue at a rate which exceeds $25,000
                  of fair market value of the stock (determined as of the Grant
                  Date) for each calendar year
<PAGE>   4
                                      -4-


                  in which such option is outstanding at any time. The accrual
                  of rights to purchase stock shall be determined in accordance
                  with Section 423(b)(8) of the Code.

         8.    Dates for Granting Options. Options shall be granted on each date
designated by the Committee as a Grant Date.

        9.     Terms and Conditions of Options.

        9.1    General. All Options granted on a particular Grant Date shall
                  comply with the terms and conditions set forth in Section 9.3
                  through 9.12, and each Option shall be identical except as to
                  the number of shares of Stock purchasable under the Option,
                  which shall be determined in accordance with Section 9.2.

        9.2    Number of Shares. The maximum number of shares of Stock which an
                  Optionee shall be permitted to purchase shall be an amount
                  equal to five percent of the Optionee's Compensation as of the
                  Grant Date divided by 85 percent of the Market Value of the
                  Stock as of the Grant Date.

        9.3    Purchase Price. The purchase price of shares of Stock shall be 85
                  percent of the lesser of (a) the Market Value of the shares as
                  of the Grant Date, or (b) the Market Value of the shares as of
                  the Exercise Date, or such greater percentage as may be set by
                  the Committee from time to time.

        9.4    Restrictions on Transfer. Options may not be transferred
                  otherwise than by will or under the laws of descent and
                  distribution. An Option may not be exercised by anyone other
                  than the Optionee during the lifetime of the Optionee. Shares
                  of Stock may be sold or otherwise transferred by the Optionee
                  without restriction subject to the provisions of Section 9.11.

        9.5    Expiration. Each Option shall expire at the close of business on
                  the Exercise Date or on such earlier date as may result from
                  the operation of Section 9.6.

        9.6    Termination of Employment of Optionee. If an Optionee ceases for
                  any reason (other than death or retirement) to be continuously
                  employed by the Company or a Related Corporation, whether due
                  to voluntary severance, involuntary severance, transfer, or
                  disaffiliation of the employer corporation with the Company,
                  his or her Option shall immediately expire, and the Optionee's
                  accumulated payroll deduction shall be returned by the Company
                  without interest. For
<PAGE>   5
                                      -5-


                  purposes of this Section 9.6, an Optionee shall be deemed to
                  be employed throughout any leave of absence for military
                  service, illness or other bona fide purpose which does not
                  exceed the longer of ninety days of the period during which
                  the Optionee's reemployment rights are guaranteed by statute
                  or by contract. If the Optionee does not return to active
                  employment prior to the termination of such period, his or her
                  employment shall be deemed to have ended on the ninety-first
                  day of such leave of absence.

        9.7    Retirement or Death of Optionee. If an Optionee retires or dies,
                  the employee or, in the case of death, his or her Beneficiary
                  shall be entitled to withdraw the Optionee's accumulated
                  payroll deductions without interest or to purchase shares on
                  the Exercise Date to the extent that the Optionee would be so
                  entitled had he or she continued to be employed by the
                  Controlled Group. The number of shares purchasable shall be
                  limited by the amount of the Optionee's accumulated payroll
                  deductions as of the date of his or her retirement or death.
                  Accumulated payroll deductions shall be applied by the Company
                  toward the purchase of shares only if the Optionee or
                  Beneficiary submits to the Company a Stock Purchase Agreement
                  pursuant to Section 9.10. Accumulated payroll deductions not
                  withdrawn or applied to the purchase of shares shall be
                  delivered by the Company to the Optionee or Beneficiary
                  without interest within a reasonable time after the Exercise
                  Date.

        9.8    Capital Changes Affecting the Stock. In the event that, between
                  the Grant Date and the Exercise Date of an Option, a stock
                  dividend is paid or becomes payable in respect of the Stock or
                  there occurs a split up or contraction in the number of shares
                  of Stock, the number of shares for which the Option may
                  thereafter be exercised and the price to be paid for each such
                  share shall be proportionately adjusted. In the event that,
                  after the Grant Date, there occurs a reclassification or
                  change of outstanding shares of the Stock or a consolidation
                  or merger of the Company with or into another corporation or a
                  sale or conveyance, substantially as a whole, of the property
                  of the Company, the Optionee shall be entitled on the Exercise
                  Date to receive shares of stock or other securities equivalent
                  in kind and value to the shares of Stock he or she would have
                  held if he or she had exercised the Option in full immediately
                  prior to such reclassification, change, consolidation, merger,
                  sale or conveyance and had continued to hold such shares
                  (together with all other shares and securities thereafter
                  issued in respect thereof) until the Exercise Date. In the
                  event that, after the Grant Date, there occurs a dissolution
                  or liquidation of the Company, except pursuant to a
                  transaction to which Section 424(a) of the Code applies, each
                  Option
<PAGE>   6
                                      -6-

                to purchase Stock of the Company to be dissolved or liquidated
                shall terminate, but the Optionee holding such Option shall
                have the right to exercise his or her Option prior to such
                dissolution or liquidation.

      9.9    Payroll Deductions. An Optionee may purchase shares under his or
                her Option by completing and returning to the Company a
                Membership Agreement indicating the amount of his or her
                Compensation, not to exceed ten percent, which is to be
                withheld each pay period. A Membership Agreement may continue
                from the period following one Grant Date to the periods
                following subsequent Grant Dates until revoked by the
                Optionee. The Optionee may withdraw any or all of his or her
                accumulated payroll deductions on the Exercise Date or such
                earlier date as is permitted by the Membership Agreement by
                submitting a written request therefor to the Company no later
                than two weeks prior to the date on which the withdrawal will
                be effective.

      9.10   Exercise of Options. On the Exercise Date the Optionee may
                purchase the number of shares purchasable by his or her
                accumulated payroll deduction, provided that:

                (a)    The number of shares of Stock purchasable shall not 
                       exceed the number of shares the Optionee is entitled
                       to purchase pursuant to Section 9.2.

                (b)    If the number of shares purchasable includes a fraction,
                       that number shall be adjusted to the next smaller
                       whole number and the purchase price shall be adjusted
                       accordingly.

                If the Optionee fails to elect to purchase shares on the
                Exercise Date, accumulated payroll deductions will be returned
                promptly after the Exercise Date without interest.

      9.11   Delivery of Stock. Within a reasonable time after the Exercise
                Date, the Company shall deliver or cause to be delivered to
                the Optionee a certificate or certificates for the number of
                shares purchased by the Optionee. At the time of any exercise
                of any Option, the Company may, if it shall deem it necessary
                or desirable for any reason connected with any law or
                applicable regulation of the Securities and Exchange
                Commission or state securities laws, require the Optionee or a
                transfer of the Optionee's rights to represent in writing to
                the Company that it is such person's then intention to acquire
                the Stock for investment, and not with a view to the
                distribution thereof. The Company shall have the right to
                place a legend on all certificates
<PAGE>   7
                                      -7-

                  that the shares represented by such certificates may not be
                  transferred unless a Registration Statement with respect to
                  these shares is effective under the Securities Act of 1933, as
                  amended, or unless the Company shall receive an opinion of
                  counsel satisfactory to it that transfer will not violate said
                  act or regulations thereunder. If any law or applicable
                  regulation of the Securities and Exchange Commission or other
                  body having jurisdiction in the premises shall require that
                  the Company or the Optionee take any action in connection with
                  the shares being purchased under the Option, delivery of the
                  certificate or certificates for such shares shall be postponed
                  until the necessary action shall have been completed. The
                  Optionee shall have no rights as a shareholder in respect of
                  shares for which he or she has not received a certificate.

        9.12   Return of Accumulated Payroll Deductions. In the event that the
                  Optionee or the Beneficiary is entitled to the return of
                  accumulated payroll deductions, whether by reason of voluntary
                  withdrawal, termination of employment, retirement, death, or
                  otherwise such amount shall be returned without interest
                  within a reasonable time after the Exercise Date or such
                  earlier date as is permitted by the Membership Agreement.
                  Payroll deductions shall be returned by the Company to the
                  Optionee or the Beneficiary, as the case may be. An Optionee's
                  Membership Agreement may specify that amounts exceeding the
                  purchase price will be carried forward to the next option
                  period under the Plan.

        9.13   Notification of Disposition. Each Membership Agreement shall
                  require a person purchasing shares of stock pursuant to the
                  exercise of an Option to notify the Company of any disposition
                  of shares so purchased prior to the expiration of two years
                  from the Grant Date or prior to the expiration of one year
                  from the Exercise Date and, to the extent applicable law
                  imposes upon the Company withholding tax requirements, to
                  remit to the Company cash sufficient to satisfy those
                  requirements.


<PAGE>   1
                                                                    EXHIBIT 23.1



                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

      As independent public accountants, we hereby consent to (i) the
incorporation by reference in this registration statement of our report dated
August 13, 1997 (except with respect to the matters discussed in footnote 3(g)
as to which the date is August 28, 1997) included in Aspen Technology, Inc.'s
Annual Report on Form 10-K for the fiscal year ended June 30, 1997 and (ii) all
references to our Firm included in this registration statement.





                                        /s/ ARTHUR ANDERSEN LLP

Boston, Massachusetts
January 15, 1998


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