Your assets and account are held by Apex Clearing and managed by ViewTrade securities. In the unlikely event that Groww and ViewTrade move out of business, your holdings and account will be completely safe and kept with Apex. You might not be able to trade further till the time a broker is allocated, but your holdings will be untouched. In the event that the custodian discontinues business then the SIPC insurance of $500,000 will kick in. In the US, the customer's holdings/assets are kept in separate accounts and cannot be touched for business purposes or neither will it act as a collateral for company/broker firms.