SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
PMC Sierra Inc.
(Name of Issuer)
COMMON STOCK
(Title of Class of Securities)
69344F106
(CUSIP Number)
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CUSIP No. 69344F106 13G Page 1 of 3 Pages
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1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
J. & W. SELIGMAN & CO. INCORPORATED
13-3043476
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 2,839,800
BENEFICIALLY OWNED (6) SHARED VOTING POWER -0-
BY EACH REPORTING (7) SOLE DISPOSITIVE POWER 3,046,595
PERSON WITH (8) SHARES DISPOSITIVE POWER -0-
9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
3,046,595
10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
10.27%
12) TYPE OF REPORTING PERSON
IA
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CUSIP No. 69344F106 13G Page 2 of 3 Pages
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Item 1(a) Name of Issuer:
PMC Sierra Inc.
Item 1(b) Address of Issuer's Principal Executive Offices:
8555 Baxter Place
Ste 105
Burabury BC, Canada V5A 4V7
Item 2(a) Name of Person Filing:
J. & W. SELIGMAN & CO. INCORPORATED
Item 2(b) Address or Principal Business Office or, if none, Residence:
100 PARK AVENUE
NEW YORK, NEW YORK 10017
Item 2(c) Citizenship:
DELAWARE CORPORATION
Item 2(d) Title of Class of Securities:
COMMON STOCK
Item 2(e) CUSIP Number:
69344F106
Item 3 If this statement is filed pursuant to Rules 13-d, or 13-2(b), check
whether the person is filing as a: Investment Adviser registered
under Section 203 of the Investment Advisers Act of 1940
/X/
Item 4(a) Amount Beneficially Owned:
3,046,595
Item 4(b) Percent of Class:
10,27%
Item 4(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote 2,839,800
(ii) shares power to vote or direct the vote -0-
(iii) sole power to dispose or to direct the disposition of 3,046,595
(iv) shares power to dispose or to direct the disposition of -0-
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CUSIP No. 69344F106 13G Page 3 of 3 Pages
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Item 5 Ownership of Five Percent or Less of a Class:
NOT APPLICABLE
Item 6 Ownership of More than Five Percent on Behalf of Another Person:
NOT APPLICABLE
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 the Group:
NOT APPLICABLE
Item 9 Notice of Dissolution of Group:
NOT APPLICABLE
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.
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,
and correct.
Lawrence P. Vogel
Senior Vice President, Finance
DECEMBER 10, 1997
Date
