[TuringNYC]

Trading information is public (quotes and trades) but the originating person/entity is not, so it would be hard to detect this via the public trade log or quote book since you couldnt see track records or profitability.

That said, the SEC does have access to the full dataset including the person/entity making the trades.

[nojito]

SEC/FINRA only gets access to blue sheet data. They don’t have direct “real time” access to all trading data.

This is why their data analytical skills are so impressive.