Originally Posted by Unregistered

It's not rare at all. Just off the top of my head:

US: Dechert, JD, HL, K&S, Sidley, Shearman, W&C
MC: A&O, CC, LL, Freshfields
SC: Ashurst, HSF, NRF

And many of them do hire SG-qualified associates, though these tend to be people with stellar credentials (ex-JLC, NUS FCH/SMU summa, Oxbridge, international moot champions, etc). There is a much greater emphasis on academics and raw intelligence given the nature of disputes work at that level which calls for intricate legal analysis and argumentation.