<PAGE> 1
Filed pursuant to Rule 424(b)(3)
Registration No.: 333-53457
SENSORMATIC ELECTRONICS CORPORATION
SUPPLEMENT NUMBER NINE TO PROSPECTUS DATED DECEMBER 20, 1999
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, Supplement Number Three dated
February 15, 2000, Supplement Number Four dated April 6, 2000, Supplement Number
Five dated May 10, 2000, Supplement Number Six dated May 30, 2000, Supplement
Number Seven dated June 21, 2000 and Supplement Number Eight dated July 11,
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 Depositary Shares
----------------------------------------- ------------------------------------------------
Beneficially Beneficially
Owned Owned
Beneficially After Beneficially After
Owned Prior to Offered This Owned Prior to Offered This
This Offering for Sale Offering This Offering for Sale Offering
----------------- --------- --------- ----------------------- -------- -------------
No. of % of
Name of Selling No. of % of Depositary Depositary
Securityholder Shares Shares Shares Shares
------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C> <C> <C> <C> <C>
AIG SoundShore Holdings
Ltd. (formerly SoundShore
Holding Fund Ltd.) (1) 146,762 * 146,762 0 110,500 1.6 110,500 0
------------------------------------------------------------------------------------------------------------------------
Calamos Growth and Income
Fund - Calamos Investment
Trust 27,674 * 27,674 0 21,000 21,000
------------------------------------------------------------------------------------------------------------------------
Total 174,436 * 174,436 0 131,500 1.9 131,500 0
------------------------------------------------------------------------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>
------------------------------------------------------------------------
6 1/2% Convertible Preferred Stock
--------------------------------------------
Beneficially
Owned
Beneficially After
Owned Prior to Offered This
This Offering for Sale Offering
--------------------- -------- ------------
No. of
Shares of % of
Name of Selling Preferred Preferred
Securityholder Stock Stock
------------------------------------------------------------------------
<S> <C> <C> <C> <C>
AIG SoundShore Holdings
Ltd. (formerly SoundShore
Holding Fund Ltd.) (1) 11,050 1.6 11,050 0
------------------------------------------------------------------------
Calamos Growth and Income
Fund - Calamos Investment
------------------------------------------------------------------------
Trust 2,100 * 2,100 0
------------------------------------------------------------------------
Total 13,150 1.9 13,150 0
------------------------------------------------------------------------
</TABLE>
(1) AIG International Management Company Inc. 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. 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 AIG SoundShore Holdings Ltd. in
the Prospectus or any Supplement thereto filed prior to the date of
this Supplement.
(2) Calamos Asset Management, Inc. 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.
The date of this Supplement is July 26, 2000
