<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 o Conversion
Beneficially Owned That Debentures Shares That May
Name May Be Sold Outstanding Be Sold
---- ----------- ----------- -------
<S> <C> <C> <C>
Allegheny Teledyne Inc. Pension Plan $ 6,900,000 0.81% 48,511
Alscott Investments, LLC $ 5,000,000 0.59% 35,153
Colgate-Palmolive Company Retirement $ 4,170,000 0.49% 29,317
Trust
Delta Airlines Inc. Retirement Plan $ 32,920,000 3.87% 231,447
El Pomar Foundation $ 1,500,000 0.18% 10,545
Golden Rule Insurance Company $ 6,700,000 0.79% 47,105
Frederic C. Hamilton $ 830,000 0.10% 5,835
L.A. Fire and Police Pension Fund $ 24,600,000 2.89% 172,952
Mark IV Industries, Inc. and $ 1,380,000 0.16% 9,702
Subsidiaries Master Trust
The Class IC Company, Ltd. $ 3,000,000 0.35% 21,091
Any other holder of Debentures or
future transferee from any such $283,705,000 33.38% 1,994,640
holder
</TABLE>
_____________________
The Date Of This Prospectus Supplement Is July 2, 1999.
