Mae'r rhestr 50 Twf Cyflym, sy'n cael ei gyhoeddi'n flynyddol ers 1999, ac sy'n cael ei baratoi gan yr Athro Dylan Jones-Evans OBE, yn dathlu'r busnesau sy'n tyfu gyflymaf yng Nghymru. Ers 1999 amcangyfrifir bod dros 600 o gwmnïau wedi creu £20 biliwn o drosiant bob blwyddyn, gan greu 40,000 o swyddi.
The Fast Growth 50 list, which has been published every year since 1999 and is compiled by Professor Dylan Jones-Evans OBE, celebrates the fastest growing businesses in Wales. Since 1999 over 600 firms are estimated to have generated £20bn of turnover annually, creating 40,000 jobs.