personal demat account for fintech companies(gs/d e shaw/arcesium/morgan stanley)

Hi folks,
really need a help here. I have a personal demat account(opened via groww) and joining one of the fintech companies mentioned above.
pls someone already working can help if i need to sell all my stocks and close existing demat account ? or if I declare my demat account, is that is also acceptable in Goldman Sachs ?

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