I generally agree with you but given your comments, you might enjoy some additional details... Or please challenge me if you think I am wrong.
I've been paying for order-level data feeds on stocks and one thing you'll find is that a lot of the 'sensitive' trades will be anonymized or broken down in different ways to obfuscate who is trading. Citadel would still be able to see there's a surprising level of interest in a certain stock but might not be able to deduce it's one actor. A broker working for SA should know they need to do this, as it helps the broker do better via commissions, etc. too.
My understanding is that Citadel negotiated directly with SA to buy the book, so the final trades were likely taking place outside of the formal market feeds.
Comments
I generally agree with you but given your comments, you might enjoy some additional details... Or please challenge me if you think I am wrong.
I've been paying for order-level data feeds on stocks and one thing you'll find is that a lot of the 'sensitive' trades will be anonymized or broken down in different ways to obfuscate who is trading. Citadel would still be able to see there's a surprising level of interest in a certain stock but might not be able to deduce it's one actor. A broker working for SA should know they need to do this, as it helps the broker do better via commissions, etc. too.
My understanding is that Citadel negotiated directly with SA to buy the book, so the final trades were likely taking place outside of the formal market feeds.