<PAGE> 1
Filed Pursuant to Rule 424(b)(3)
Registration No. 333-53457
SENSORMATIC ELECTRONICS CORPORATION
SUPPLEMENT NUMBER FOUR TO PROSPECTUS DATED DECEMBER 20, 2000
This Supplement is a part of the Prospectus dated December 20, 1999
relating to 6,900,000 Depositary Shares ("Depositary Shares"), each representing
a one-tenth interest in a share of 6 1/2% Convertible Preferred Stock, par value
$.01 per share ("Preferred Stock"), of Sensormatic Electronics Corporation
("Sensormatic"). The Prospectus (as well as this Supplement) also relates to
690,000 shares of the Preferred Stock and certain shares of Common Stock, par
value $.01 per share, of Sensormatic, issued upon conversion of such Depositary
Shares and/or Preferred Stock and issued or issuable in payment of dividends and
certain premium payments with respect to the Preferred Stock. The Prospectus was
previously supplemented by Supplement Number One dated January 24, 2000,
Supplement Number Two dated January 25, 2000 and Supplement Number Three dated
February 15, 2000. Defined terms contained in this Supplement have the meanings
assigned to them in the Prospectus.
The following updates certain information concerning the Selling
Securityholders and the securities of Sensormatic held by them, as set forth in
the Prospectus under the caption "Selling Security Holders", based on
information received from the Selling Securityholders named below after the date
of the Prospectus and prior to the date hereof. The information concerning the
Selling Securityholders in the Prospectus (including any previous Supplement) is
not being updated to show sales, except to the extent that any such sales are
reflected in the current beneficial ownership information set forth below.
Except as amended or supplemented hereby or as contemplated by the preceding
sentence, the information in the Prospectus concerning the Selling
Securityholders and the securities of Sensormatic held by them, as previously
amended by any Supplements previously filed, remains in full force and effect.
<TABLE>
<CAPTION>
- ----------------------------------------------------------------
Common Stock
- ----------------------------------------------------------------
Bene-
ficially
Owned
Beneficially After
Name of Selling Owned Prior to Offered This
Securityholder This Offering for Sale Offering
- ----------------------------------------------------------------
No. of % of
Shares Shares
- ----------------------------------------------------------------
<S> <C> <C> <C> <C>
ABN Amro Inc. 765,241 * 765,241 0
BNP Arbitrage SNC (1) 6,660 * 6,660 0
GPZ Trading LLC 162 * 162 0
Robert B. Holmes (2) 3,656 * 3,656 0
Lens II L.P. (2) 10,276 * 10,276 0
Putnam Convertible Income
Growth Trust (3) 25,377 * 25,377 0
TQA Master Fund (4) 187,908 * 187,908 0
TQA Master Plus Fund (4) 32,427 * 32,427 0
Total 1,031,707 * 1,031,707 0
</TABLE>
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------
Depositary Shares
- ---------------------------------------------------------------------
Bene-
ficially
Owned
After
Name of Selling Beneficially Owned Offered This
Securityholder Prior to This Offering for Sale Offering
- ---------------------------------------------------------------------
No. of % of
Depositary Depositary
Shares Shares
- ---------------------------------------------------------------------
<S> <C> <C> <C> <C>
ABN Amro Inc. 597,500 8.6 597,500 0
BNP Arbitrage SNC (1) 5,200 * 5,200 0
GPZ Trading LLC 0 * 0 0
Robert B. Holmes (2) 2,625 * 2,625 0
Lens II L.P. (2) 7,375 * 7,375 0
Putnam Convertible Income
Growth Trust (3) 0 * 0 0
TQA Master Fund (4) 125,000 1.8 125,000 0
TQA Master Plus Fund (4) 20,000 * 20,000 0
Total 757,700 11 757,700 0
</TABLE>
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------
6 1/2% Convertible Preferred Stock
- ----------------------------------------------------------------------------
Beneficially
Owned
Name of Selling Beneficially Owned Offered After this
Securityholder Prior to This Offering for Sale Offering
- ----------------------------------------------------------------------------
No. of
Shares of % of
Preferred Preferred
Stock Stock
- ----------------------------------------------------------------------------
<S> <C> <C> <C> <C>
ABN Amro Inc. 59,750 8.6 59,750 0
BNP Arbitrage SNC (1) 520 * 520 0
GPZ Trading LLC 0 * 0 0
Robert B. Holmes (2) 262 * 262 0
Lens II L.P. (2) 737 * 737 0
Putnam Convertible Income
Growth Trust (3) 0 * 0 0
TQA Master Fund (4) 12,500 1.8 12,500 0
TQA Master Plus Fund (4) 2,000 * 2,000 0
Total 75,769 11 75,769 0
</TABLE>
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(1) The information in this Supplement reflects the current beneficial
ownership information for this Selling Securityholder as of the date of
this filing and accordingly amends and supersedes the information
concerning this Selling Securityholder in the Prospectus or any
Supplement thereto filed prior to the date of this Supplement.
(2) The Ram Trust Services acts as investment advisor with respect to the
Selling Securityholder and as such has shared voting and investment
power with respect to the Securities owned by the Selling
Securityholder.
(3) Putnam Investment Management, Inc. acts as investment manager with
respect to the Selling Securityholder and as such has shared voting and
investment power with respect to the Securities owned by the Selling
Securityholder. The information in this Supplement reflects the current
beneficial ownership information for this Selling Securityholder as of
the date of this filing and accordingly amends and supersedes the
information concerning this Selling Securityholder in the Prospectus or
any Supplement thereto filed prior to the date of this Supplement.
(4) TQA Arbitrage Fund, L.P. and TQA Vantage Fund, Ltd., Selling
Securityholders pursuant to the Prospectus, transferred all securities
of Sensormatic held by them to the TQA Master Fund. TQA Vantage Plus
Fund, Ltd., a Selling Securityholder pursuant to the Prospectus (named
TQA Vantage Plus, Ltd. in the Prospectus), transferred all shares of
Sensormatic held by it to the TQA Master Plus Fund. The information
concerning TQA Master Fund and TQA Master Plus Fund amends and
supersedes all prior information concerning TQA Arbitrage Fund, L.P.,
TQA Vantage Fund, Ltd., and TQA Vantage Plus, Ltd. in the Prospectus or
any Supplement thereto filed prior to the date of this Supplement.
THE DATE OF THIS SUPPLEMENT IS APRIL 6, 2000
