I think they absolutely could, and the SEC would be OK with it, but BRK.A is listed on the NYSE, not the Nasdaq, so it doesn't have a contract with them. Like o

I think they absolutely could, and the SEC would be OK with it, but BRK.A is listed on the NYSE, not the Nasdaq, so it doesn't have a contract with them. Like other US stocks, you can still trade it on other exchanges than the listing one.