ETC (Electronic Transaction Clearing) is the ultimate custodian (DriveWealth is sub-custodian), where shares are held on a books and records basis. This is different to some other global exchanges

These are listed equities only, execution is via the US exchanges, routed through NBBO (National Best Bid and Offer) when required. 1 full share gives you a voting right, while a fractional component only gives you full economic interest as per the books and records at the custodian.