<PAGE> 1
FILED PURSUANT TO
RULE 424(B)(3)
Registration No. 333-86257
SUPPLEMENT, DATED SEPTEMBER 26, 2000, TO PROSPECTUS, DATED SEPTEMBER 17, 1999,
OF UNITEDGLOBALCOM, INC.
Additional Selling Securityholders. The following selling securityholders are
added to the list of selling securityholders in the prospectus:
<TABLE>
<CAPTION>
NUMBER OF DEPOSITARY SHARES
---------------------------
NAME OF SELLING SECURITYHOLDER OWNED OFFERED
------------------------------ ------- -------
<S> <C> <C>
MFS Series Trust VI: Utilities Fund........................................ 160,820 160,820
MFS/Sun Life - Utilities Series............................................. 39,900 39,900
MFS VIT - MFS Utilities Series.............................................. 177,000 177,000
</TABLE>
