These trading figures tell you nothing apart from the broker has...

These trading figures tell you nothing apart from the broker has a lot of day traders...They look like brokers Entrepot accounts and are ONLY used for settlements.
They would have other nominee accounts which are used for HOLDING stock on behalf of clients.
Don't forget there are advisers as well as clients who trade stocks on a daily basis and share the profits with the Firm they work for.
Years ago you were able,if you worked for a broker to see the trading by stock and by broker and work out who was a net buyer or seller.That is no longer possible until 3 days after the event