I bought a few stocks on UOB Kayhian, not a custodian brokerage. I read that I am able to sell my stocks, from CDP account if I link the account with moomoo. Anyone knows how does this work?

From my knowledge, I believe you have to transfer your CDP stocks to Moomoo before you're able to sell.

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If your objective is to reduce your commission on selling, you could link your CDP account with FSMOne. The selling commissions there are $8.80 flat (lower than the usual $25 or 0.28%)