Supplement, Dated October 15, 1999, to Prospectus, Dated September 17, 1999,
of UnitedGlobalCom, Inc.
Additional Selling Shareholders. The following selling shareholders are added to
the list of selling shareholders in the prospectus:
Number of Depositary Shares
Name of Selling Securityholder Owned Offered
Arkansas Teachers Retirement System........ 41,120 41,120
Baptist Health of South Florida............ 2,730 2,730
BNP Arbitrage SNC.......................... 132,500 132,500
Boston Museum of Fine Art.................. 2,110 2,110
Elf Aquitaine.............................. 2,000 2,000
Engineers Joint Pension Fund............... 5,680 5,680
GLG Global Convertible Fund................ 118,000 118,000
GLG Global Convertible Ucits Fund.......... 7,500 7,500
Lord Abbett & Co. Oxford Fund.............. 20,000 20,000
Lord Abbett Bond Debenture Fund............ 259,000 259,000
Lord Abbett Investment Trust High Yield.... 6,000 6,000
Lord Abbett Securities Trust - World Bond.. 4,000 4,000
Nicholas-Applegate Convertible Fund........ 7,445 7,445
Physicians Life............................ 4,000 4,000
Pilgrim Convertible Fund................... 45,475 45,475
San Diego City Retirement.................. 15,930 15,930
San Diego County Convertible............... 41,470 41,470
University of South Florida................ 3,500 3,500
Wake Forest University..................... 14,040 14,040
