Citadel Securities files counterclaim against HFT Solutions in patent infringement lawsuit
Jan 6, 2026
•1 minute read
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HFT Solutions sued Citadel Securities in December 2024 for allegedly infringing three patents related to field programmable gate arrays with external phase-locked loops. Citadel Securities filed a counterclaim on January 5, 2026, in Illinois Northern District Court seeking declaratory judgment that the asserted patents are invalid and not infringed. The case involves high-frequency trading technology patents between the two financial technology companies.
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