ARIAD PHARMACEUTICALS INC
SC 13G/A, 2000-01-10
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                        SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC  20549


                                   SCHEDULE 13G
                                  (RULE 13d-102)


              INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
                               PURSUANT TO 13d-2(b)

                               (AMENDMENT NO. 1)(1)


                               ARIAD PHARMACEUTICALS
                               ---------------------
                                 (Name of Issuer)

                                   COMMON STOCK
                           -----------------------------
                          (Title of Class of Securities)

                                    04033A 10 0
                                   --------------
                                   (CUSIP Number)


                                  JANUARY 4, 2000
                                  ---------------
              (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

         / /    Rule 13d-1(b)
         /X/    Rule 13d-1(c)
         / /    Rule 13d-1(d)



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

   (1) The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which
would alter the disclosures provided in a prior cover page.

   The information required on the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities
Exchange Act of 1934 or otherwise subject to the liabilities of that
section of the Act but shall be subject to all other provisions of the Act
(however, see the NOTES).

<PAGE>

CUSIP NO. 04033A 10 0                 13G                    PAGE 2 OF 8 PAGES

- -------------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS:
        BIOTECHNOLOGY VALUE FUND, L.P.
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY):
- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) /X/  (b) / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY
- -------------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
         DELAWARE
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (5) SOLE VOTING POWER
 BENEFICIALLY                       0
 OWNED BY                    --------------------------------------------------
 EACH REPORTING               (6) SHARED VOTING POWER
 PERSON WITH                        406,921
                             --------------------------------------------------
                              (7) SOLE DISPOSITIVE POWER
                                    0
                             --------------------------------------------------
                              (8) SHARED DISPOSITIVE POWER
                                    406,921
- -------------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
           406,921
- -------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*  / /
- -------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
     1.8%
- -------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON*
     PN
- -------------------------------------------------------------------------------

                        *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>

CUSIP NO. 04033A 10 0                 13G                    PAGE 3 OF 8 PAGES

- -------------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS:
        BIOTECHNOLOGY VALUE FUND II, L.P.
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY):
- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) /X/  (b) / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY
- -------------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
         DELAWARE
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (5) SOLE VOTING POWER
 BENEFICIALLY                       0
 OWNED BY                    --------------------------------------------------
 EACH REPORTING               (6) SHARED VOTING POWER
 PERSON WITH                        328,230
                             --------------------------------------------------
                              (7) SOLE DISPOSITIVE POWER
                                    0
                             --------------------------------------------------
                              (8) SHARED DISPOSITIVE POWER
                                    328,230
- -------------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
           328,230
- -------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*  / /
- -------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
     1.5%
- -------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON*
     PN
- -------------------------------------------------------------------------------

                        *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>

CUSIP NO. 04033A 10 0                 13G                    PAGE 4 OF 8 PAGES

- -------------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS:
        BVF PARTNERS L.P.
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY):
- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) /X/  (b) / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY
- -------------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
         DELAWARE
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (5) SOLE VOTING POWER
 BENEFICIALLY                       0
 OWNED BY                    --------------------------------------------------
 EACH REPORTING               (6) SHARED VOTING POWER
 PERSON WITH                        779,151
                             --------------------------------------------------
                              (7) SOLE DISPOSITIVE POWER
                                    0
                             --------------------------------------------------
                              (8) SHARED DISPOSITIVE POWER
                                    779,151
- -------------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
           779,151
- -------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*  / /
- -------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
     3.5%
- -------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON*
     PN
- -------------------------------------------------------------------------------

                        *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

CUSIP NO. 04033A 10 0                 13G                    PAGE 5 OF 8 PAGES

- -------------------------------------------------------------------------------
 (1) NAMES OF REPORTING PERSONS:
        BVF INC.
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)
- -------------------------------------------------------------------------------
 (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) /X/  (b) / /
- -------------------------------------------------------------------------------
 (3) SEC USE ONLY
- -------------------------------------------------------------------------------
 (4) CITIZENSHIP OR PLACE OF ORGANIZATION
         DELAWARE
- -------------------------------------------------------------------------------
 NUMBER OF SHARES             (5) SOLE VOTING POWER
 BENEFICIALLY                       0
 OWNED BY                    --------------------------------------------------
 EACH REPORTING               (6) SHARED VOTING POWER
 PERSON WITH                        779,151
                             --------------------------------------------------
                              (7) SOLE DISPOSITIVE POWER
                                    0
                             --------------------------------------------------
                              (8) SHARED DISPOSITIVE POWER
                                    779,151
- -------------------------------------------------------------------------------
 (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
           779,151
- -------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*  / /
- -------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
     3.5%
- -------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON*
     IA, CO
- -------------------------------------------------------------------------------

                        *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

CUSIP NO. 04033A 10 0                 13G                    PAGE 6 OF 8 PAGES


ITEM 1(a).  NAME OF ISSUER:

            Ariad Pharmaceuticals, Inc. ("Ariad")

ITEM 1(b).  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

            26 Landsowne Street
            Cambridge, MA 02139-4234

ITEM 2(a).  NAME OF PERSON FILING:

            This amendment to Schedule 13G is being filed on behalf of the
            following persons*:

            (i)     Biotechnology Value Fund, L.P. ("BVF")
            (ii)    Biotechnology Value Fund II, L.P. ("BVF2")
            (iii)   BVF Partners, L.P. ("Partners")
            (iv)    BVF Inc. ("BVF Inc.")

            *       Attached as Exhibit A is a copy of an agreement between the
                    Persons filing (as specified hereinabove) that this
                    amendment to Schedule 13G is being filed on behalf of each
                    of them.

ITEM 2(b).  ADDRESS OF PRINCIPAL BUSINESS OFFICE:

            The principal business office of the persons comprising the group
filing this amendment to Schedule 13G is located at 227 West Monroe Street,
Suite 4800, Chicago, Illinois  60606.

ITEM 2(c).  CITIZENSHIP:

            BVF:            a Delaware limited partnership
            BVF2:           a Delaware limited partnership
            Partners:       a Delaware limited partnership
            BVF Inc.:       a Delaware corporation

ITEM 2(d).  TITLE OF CLASS OF SECURITIES:

            Common Stock.

ITEM 2(e).  CUSIP NUMBER:

            04033A 10 0

<PAGE>

CUSIP NO. 04033A 10 0                 13G                    PAGE 7 OF 8 PAGES

ITEM 3.   IF THIS STATEMENT IS FILED PURSUANT TO RULE 13d-1(c), CHECK THIS
          BOX:  / /

ITEM 4.   OWNERSHIP:

          The information in items 1 and 5 through 11 on the cover pages
(pp. 2 - 5) on this amendment to Schedule 13G is hereby incorporated by
reference.

ITEM 5.   OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

          If this schedule is being filed to report the fact that as of the
date hereof the reporting person has ceased to be the beneficial owner of
more than five percent of the class of securities check the following. /X/

ITEM 6.   OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON:

          BVF shares voting and dispositive power over the shares of the
Stock it beneficially owns with Partners.  BVF2 also shares voting and
dispositive power over the shares of the Stock it beneficially owns with
Partners.  Partners and BVF Inc. share voting and dispositive power over the
shares of the Stock they beneficially own with, in addition to BVF and BVF2,
certain managed accounts on whose behalf Partners, as investment manager,
purchased such shares. BVF Inc. also shares voting and dispositive power over
the shares of the Stock they beneficially own with, in addition to BVF, BVF2
and Partners, certain other managed accounts on whose behalf BVF Inc., as
investment manager, purchased such shares.  None of the managed accounts
individually own more than 5% of the Stock of the Issuer.

ITEM 7.   IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
          THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY:

          Not applicable.

ITEM 8.   IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF A GROUP:

          Not applicable.

ITEM 9.   NOTICE OF DISSOLUTION OF GROUP:

          Not applicable.

<PAGE>

CUSIP NO. 04033A 10 0                 13G                    PAGE 8 OF 8 PAGES

ITEM 10.  CERTIFICATION

          By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are not held
for the purpose of or with the effect of changing or influencing the control
of the issuer of the securities and were not acquired and are not held in
connection with or as a participant in any transaction having that purpose or
effect.

          After reasonable inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this amendment to
Schedule 13G is true, complete and correct.

Dated:  January 7, 2000

          BIOTECHNOLOGY VALUE FUND, L.P.

          By:  BVF Partners L.P., its general partner

               By:  BVF Inc., its general partner


                    By: /s/ Mark N. Lampert
                        -----------------------
                        Mark N. Lampert
                        President

          BIOTECHNOLOGY VALUE FUND II, L.P.

          By:  BVF Partners L.P., its general partner

               By:  BVF Inc., its general partner


                    By: /s/ Mark N. Lampert
                        -----------------------
                        Mark N. Lampert
                        President

          BVF PARTNERS L.P.

          By:  BVF Inc., its general partner


               By: /s/ Mark N. Lampert
                   -----------------------
                   Mark N. Lampert
                   President

          BVF INC.


               By: /s/ Mark N. Lampert
                   -----------------------
                   Mark N. Lampert
                   President


<PAGE>

                                                                     EXHIBIT A


                       AGREEMENT REGARDING JOINT FILING

         The undersigned, Biotechnology Value Fund, L.P., a Delaware limited
partnership, Biotechnology Value Fund II, L.P., a Delaware limited
partnership, BVF Partners L.P., a Delaware limited partnership, and BVF Inc.,
a Delaware corporation, hereby agree and acknowledge that the information
required by this amendment to Schedule 13G, to which this Agreement is
attached as an exhibit, is filed on behalf of each of them.  The undersigned
further agree that any further amendments or supplements thereto shall also
be filed on behalf of each of them.

Dated:  January 7, 2000

          BIOTECHNOLOGY VALUE FUND, L.P.

          By:  BVF Partners L.P., its general partner

               By:  BVF Inc., its general partner


                    By: /s/ Mark N. Lampert
                        -----------------------
                        Mark N. Lampert
                        President

          BIOTECHNOLOGY VALUE FUND II, L.P.

          By:  BVF Partners L.P., its general partner

               By:  BVF Inc., its general partner


                    By: /s/ Mark N. Lampert
                        -----------------------
                        Mark N. Lampert
                        President

          BVF PARTNERS L.P.

          By:  BVF Inc., its general partner


               By: /s/ Mark N. Lampert
                   -----------------------
                   Mark N. Lampert
                   President

          BVF INC.


               By: /s/ Mark N. Lampert
                   -----------------------
                   Mark N. Lampert
                   President



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