Inside the TCP Packet Splitting Exploit: How CME’s 3-Microsecond Penalty Killed HFT Front-Loading ($145K+ in Fines)

In high-frequency trading, the difference between profit and loss is measured in nanoseconds. For years, the most sophisticated firms didn’t just optimize their code—they weaponized the exchange’s own network protocols. This is the forensic investigation into “packet splitting,” the microstructure exploit that let traders pre-position orders in CME’s RA…