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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
(Rule 13d-102)
INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
Under the Securities Exchange Act of 1934
(Amendment No. 1 )
IDEC Pharmaceuticals Corporation
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(Name of Issuer)
Common Stock
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(Title of Class of Securities)
449370105
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(CUSIP Number)
Check the following box if a fee is being paid with this statement [ ].
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*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 in 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 ("Act") 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).
CUSIP No. 449370105 13G Page 2 of 8 Pages
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1. NAME OF REPORTING PERSON(S)
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON(S)
Morgan Stanley Dean Witter & Co.
IRS # 39-314-5972
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2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [ ]
(b) [ ]
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3. SEC USE ONLY
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4. CITIZENSHIP OR PLACE OF ORGANIZATION
The state of organization is Delaware.
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NUMBER OF 5. SOLE VOTING POWER
SHARES 0
BENEFICIALLY --------------------------------------------------------------
OWNED BY 6. SHARED VOTING POWER
EACH 567,411
REPORTING --------------------------------------------------------------
PERSON 7. SOLE DISPOSITIVE POWER
WITH 0
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8. SHARED DISPOSITIVE POWER
571,711
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9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
571,711
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10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
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11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.86%
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12. TYPE OF REPORTING PERSON*
IA, CO
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*SEE INSTRUCTIONS BEFORE FILLING OUT!
CUSIP No. 449370105 13G Page 3 of 8 Pages
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1. NAME OF REPORTING PERSON(S)
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON(S)
Morgan Stanley Dean Witter Advisors Inc.
IRS # 13-3680016
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2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [ ]
(b) [ ]
- --------------------------------------------------------------------------------
3. SEC USE ONLY
- --------------------------------------------------------------------------------
4. CITIZENSHIP OR PLACE OF ORGANIZATION
The state of organization is Delaware.
- --------------------------------------------------------------------------------
NUMBER OF 5. SOLE VOTING POWER
SHARES 0
BENEFICIALLY --------------------------------------------------------------
OWNED BY 6. SHARED VOTING POWER
EACH 450,000
REPORTING --------------------------------------------------------------
PERSON 7. SOLE DISPOSITIVE POWER
WITH 0
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8. SHARED DISPOSITIVE POWER
452,600
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9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
452,600
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10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- --------------------------------------------------------------------------------
11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.26%
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12. TYPE OF REPORTING PERSON*
IA, CO
- --------------------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
CUSIP No. 449370105 13G Page 4 of 8 Pages
Item 1. (a) Name of Issuer:
IDEC Pharmaceuticals Corporation
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(b) Address of Issuer's Principal Executive Offices:
11011 Torreyana Road
San Diego, CA 92121
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Item 2. (a) Name of Person Filing:
(a) Morgan Stanley Dean Witter & Co.
(b) Morgan Stanley Dean Witter Advisors Inc.
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(b) Address of Principal Business Office, or if None, Residence:
(a) 1585 Broadway
New York, New York 10036
(b) Two World Trade Center
New York, New York 10048
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(c) Citizenship:
Incorporated by reference to Item 4 of the
cover page pertaining to each reporting person.
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(d) Title of Class of Securities:
Common Stock
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(e) CUSIP Number:
449370105
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Item 3. (a) Morgan Stanley Dean Witter & Co. is (e) an Investment
Adviser registered under Section 203 of the
Investment Advisers Act of 1940.
(b) Morgan Stanley Dean Witter Advisors Inc. is (e) an
Investment Adviser registered under Section 203 of
the Investment Advisers Act of 1940.
CUSIP No. 449370105 13-G Page 5 of 8 Pages
Item 4. Ownership.
Incorporated by reference to Items (5) - (9) and (11) of the
cover page.
Item 5. Ownership of Five Percent or Less of a Class.
(a) As of the date hereof, Morgan Stanley Dean Witter & Co. has
ceased to be the beneficial owner of more than five percent
of the class of securities.
(b) As of the date hereof, Morgan Stanley Dean Witter Advisors
Inc. has ceased to be the beneficial owner of more than five
percent of the class of securities.
Item 6. Ownership of More Than Five Percent on Behalf of Another Person.
Inapplicable
Item 7. Identification and Classification of the Subsidiary which Acquired
the Security Being Reported on By the Parent Holding Company.
Item 8. Identification and Classification of Members of the Group.
Item 9. Notice of Dissolution of Group.
Item 10. Certification.
By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were acquired in the
ordinary course of business and were not acquired for the purpose
of and do not have the effect of changing or influencing the
control of the issuer of such securities and were not acquired in
connection with or as a participant in any transaction having
such purpose or effect.
CUSIP No. 449370105 13-G Page 6 of 8 Pages
Signature.
After reasonable inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this
statement is true, complete and correct.
Date: February 5, 1999
Signature: /s/ Bruce Bromberg
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Name/Title Bruce Bromberg / Vice President Morgan Stanley & Co. Incorporated
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MORGAN STANLEY DEAN WITTER & CO.
Date: February 5, 1999
Signature: /s/ Barry Fink
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Name/Title Barry Fink / Senior Vice President Morgan Stanley Dean Witter
Advisors Inc.
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MORGAN STANLEY DEAN WITTER ADVISORS INC.
INDEX TO EXHIBITS PAGE
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EXHIBIT 1 Agreement to Make a Joint Filing 7
EXHIBIT 2 Secretary's Certificate Authorizing Bruce Bromberg 8
to Sign on behalf of Morgan Stanley Dean Witter & Co.
* Attention. Intentional misstatements or omissions of fact constitute federal
criminal violations (see 18 U.S.C. 1001).
(022597DTI)
Cusip No. 449370105 13G Page 7 of 8 Pages
EXHIBIT 1 TO SCHEDULE 13G
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FEBRUARY 5, 1999
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MORGAN STANLEY DEAN WITTER & CO. and MORGAN STANLEY DEAN WITTER
ADVISORS INC. hereby agree that, unless differentiated, this Schedule
13G is filed on behalf of each of the parties.
MORGAN STANLEY DEAN WITTER & CO.
BY: /s/ Bruce Bromberg
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Bruce Bromberg / Vice President Morgan Stanley & Co. Incorporated
MORGAN STANLEY DEAN WITTER ADVISORS INC.
BY: /s/ Barry Fink
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Barry Fink / Senior Vice President Morgan Stanley Dean Witter
Advisors Inc.
Page 8 of 8 Pages EXHIBIT 1 ------------------- MORGAN STANLEY, DEAN WITTER, DISCOVER & CO. SECRETARY'S CERTIFICATE I, Charlene R. Herzer, a duly elected and acting Assistant Secretary of Morgan Stanley, Dean Witter, Discover & Co., a corporation organized and existing under the laws of the State of Delaware (the "Corporation"), certify that as approved by a Unanimous Consent of Directors in Lieu of a Meeting dated as of May 31, 1997, the following persons are each authorized to sign reports to be filed under Sections 13 and 16 of the Securities Exchange Act of 1934 on behalf of the Corporation, and such authorizations are in full force and effect as of this date: Stuart J.M. Breslow Robert G. Koppenol Bruce Bromberg Robin Sherak IN WITNESS WHEREOF, I have hereunto set my name and affixed the seal of the Corporation as of the 3rd day of June, 1997. /s/ Charlene R. Herzer ------------------------ Charlene R. Herzer Assistant Secretaty