<PAGE>
Filed pursuant to Rule 424(b)(3)
Registration No. 333-78909
Prospectus Supplement
(To Prospectus Dated June 11, 1999)
$850,000,000
[CITRIX LOGO APPEARS HERE]
Zero Coupon Convertible Subordinated Debentures Due 2019
_________________
This prospectus supplement relates to the resale by the holders of
Citrix Systems, Inc. Zero Coupon Convertible Subordinated Debentures Due 2019
and the shares of common stock, $.001 par value per share, issuable upon the
conversion of the debentures.
This prospectus supplement should be read in conjunction with, and may
not be delivered or utilized without, the prospectus dated June 11, 1999,
including any amendments or supplements thereto. The terms of the debentures
are set forth in the prospectus.
The information in the table appearing under the heading "Selling
Securityholders" in the prospectus is amended by adding the information below
with respect to persons not previously listed in the prospectus or in any
amendments or supplements thereto, and by superceding the information with
respect to persons previously listed in the prospectus or in any amendments or
supplements thereto that are listed below:
<TABLE>
<CAPTION>
Principal Amount at Number of
Maturity of Debentures Percentage of Conversion
Beneficially Owned That Debentures Shares That May
Name May Be Sold Outstanding Be Sold
---- ----------- ----------- -------
<S> <C> <C> <C>
Deutsche Bank Securities Inc. 20,200,000 2.376% 142,018
Credit Suisse First Boston Corporation 540,000 0.064% 3,796
</TABLE>
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The Date Of This Prospectus Supplement Is February 18, 2000.
