<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]
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 Maturity Number of
of Debentures Beneficially Percentage of Conversion
Owned That Debentures Shares That May
Name May Be Sold Outstanding Be Sold
---- ----------- ----------- -------
<S> <C> <C> <C>
Federated Insurance Series, on behalf of $ 1,500,000 0.18% 10,545
its Federated Equity Income Fund II
Nationwide Family of Funds, on behalf of $ 450,000 0.05% 3,163
its Nationwide Equity Income Fund
Ohio National Equity Income Portfolio, on $ 50,000 0.01% 351
behalf of its Ohio National Fund, Inc.
Federated Equity Income Fund, Inc. $ 57,000,000 6.71% 400,744
CIBC World Market International Arbitrage $ 7,500,000 0.88% 52,729
Corp.
Employee Benefit Convertible Securities $ 925,000 0.11% 6,503
Fund
Nations Capital Income Fund $ 12,350,000 1.45% 86,827
Pacific Innovations Trust Capital Income $ 925,000 0.11% 6,503
Fund
Any other holder of Debentures or $137,095,000 16.13% 963,891
future transferee from any such holder
</TABLE>
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The Date Of This Prospectus Supplement Is August 13, 1999.
