<PAGE> 1
Filed pursuant to rule 424(b)(3)
Registration No. 333-53457
SENSORMATIC ELECTRONICS CORPORATION
SUPPLEMENT NUMBER THREE 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 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 and Supplement Number Two dated January 25, 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 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 remains in full force and effect.
<TABLE>
<CAPTION>
Common Stock Depositary Shares
- ----------------------------- ---------------------------------------- ------------------------------------------------
Bene- Bene-
ficially ficially
Owned Owned
Beneficially After After
Name of Selling Owned Prior to Offered for This Beneficially Owned Offered for This
Securityholder This Offering Sale Offering Prior to This Offering Sale Offering
- ----------------------------- --------------- ----------- -------- ---------------------- ----------- --------
No. of % of
No. of % of Depositary Depositary
Shares Shares Shares Shares
- ----------------------------- -------- ------ ----------- -------- ---------- ---------- ----------- --------
<S> <C> <C> <C> <C> <C> <C> <C> <C>
ABN Amro Inc. 329,790 * 329,790 0 257,500 3.7 257,500 0
Bank of America Pension
Plan (1) 65,635 * 65,635 0 45,850 * 45,850 0
Bear, Stearns & Co. Inc.(2) 166,506 * 166,506 0 82,059 1.2 82,059 0
Deephaven Domestic
Convertible Trading Ltd.(3) 340,093 * 340,093 0 265,545 3.8 265,545 0
Forest Fulcrum Fund L.P.(2) 62,745 * 62,745 0 41,474 * 41,474 0
Forest Global Convertible
Fund Series A-5 (2) 214,172 * 214,172 0 141,676 2 141,676 0
General Motors Welfare
Benefit Trust (L-T VEBA)
(1) 29,915 * 29,915 0 22,700 * 22,700 0
GPZ Trading LLC (4) 6,450 * 6,450 0 5,036 * 5,036 0
Jefferies & Company, Inc.(2) 28,823 * 28,823 0 22,000 * 22,000 0
<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. 25,750 3.7 25,750 0
Bank of America Pension
Plan (1) 4,585 * 4,585 0
Bear, Stearns & Co. Inc.(2) 8,206 1.2 8,206 0
Deephaven Domestic
Convertible Trading Ltd.(3) 26,555 3.8 26,555 0
Forest Fulcrum Fund L.P.(2) 4,147 * 4,147 0
Forest Global Convertible
Fund Series A-5 (2) 14,167 2 14,167 0
General Motors Welfare
Benefit Trust (L-T VEBA)
(1) 2,270 * 2,270 0
GPZ Trading LLC (4) 504 * 504 0
Jefferies & Company, Inc.(2) 2,200 * 2,200 0
</TABLE>
<PAGE> 2
<TABLE>
<CAPTION>
Common Stock Depositary Shares
- ----------------------------- ---------------------------------------- ------------------------------------------------
Bene- Bene-
ficially ficially
Owned Owned
Beneficially After After
Name of Selling Owned Prior to Offered for This Beneficially Owned Offered for This
Securityholder This Offering Sale Offering Prior to This Offering Sale Offering
- ----------------------------- --------------- ----------- -------- ---------------------- ----------- --------
No. of % of
No. of % of Depositary Depositary
Shares Shares Shares Shares
- ----------------------------- -------- ------ ----------- -------- ---------- ---------- ----------- --------
<S> <C> <C> <C> <C> <C> <C> <C>
Peoples Benefit Life
Insurance Company(5) 456,144 * 456,144 0 308,800 4.5 308,800 0
(The) Retail Clerks Pension
Trust(1)(2) 146,927 * 146,927 0 100,500 1.7 100,500 0
Susquehanna Capital
Group(6) 12,807 * 12,807 0 10,000 * 10,000 0
Total 1,860,007 * 1,860,007 0 1,303,140 18.9 1,303,140 0
<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>
Peoples Benefit Life
Insurance Company(5) 30,880 4.5 30,880 0
(The) Retail Clerks Pension
Trust(1)(2) 10,050 1.7 10,050 0
Susquehanna Capital
Group(6) 1,000 * 1,000 0
Total 130,314 18.9 130,314 0
</TABLE>
THE DATE OF THIS SUPPLEMENT IS FEBRUARY 15, 2000
(1) Camden Asset Management, LP 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.
(2) 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.
(3) Deephaven Market Neutral Trading L.P. and Deephaven Market Neutral
Trading Limited, Selling Securityholders pursuant to the Prospectus,
transferred all shares of Sensormatic held by them to the Deephaven
Market Neutral Master Fund L.P. which then transferred all shares to
the Deephaven Domestic Convertible Trading Ltd. The information
concerning Deephaven Domestic Convertible Trading Ltd. amends and
supersedes all prior information concerning Deephaven Market Neutral
Trading L.P. and Deephaven Market Neutral Trading Limited in the
Prospectus or any Supplement thereto filed prior to the date of this
Supplement.
(4) Merrill Lynch 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.
(5) The information in this Supplement amends and supersedes the
information in the Prospectus concerning Monumental Life Insurance
Company (Teamster-Camden Non-Enhanced). Camden Asset Management, LP
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.
(6) The Securities of this Selling Security Holder are pledged to Merrill
Lynch Professional Clearing Corp., the clearing agent for Susquehanna
Capital Group.
