Interactive Brokers - all eggs in one basket?

I would say not exactly.

Cheap brokers register all customer’s securities at a Central Securities Depositary in their name. This is called “omnibus” account. If S really hits the F, the broker busts and isn’t able to sort out who owns what and how much, it will take quite some efforts to settle this situation.

At least Swissquote claims to register securities at customer’s name. Therefore if they are bust, it has no impact on customers.

En cas de faillite de Swissquote Bank SA, l’intégralité des titres est garantie dans la mesure où ils sont en dépôt auprès des dépositaires respectifs qui les conservent en votre nom.

(When I checked few years ago, there was an error in the English translation of this phrase, therefore here is the original in French).

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