Patent 11575381
Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
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PTAB activity (1)
AIA trial proceedings — IPR, PGR, CBM — filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced directly from the PTAB Trial API.
- IPR2026-00151IPRfiled Dec 3, 2025vs. Citadel Securities LLCInstitution Denied
Cached for 24 hours. Status strings are sourced verbatim from the PTAB API; the colored badge is our heuristic classification.
Cases on file (4)
Group view →Specific litigation cases in our database that name US patent 11575381. The free-form analysis below may also discuss cases beyond this list.
- Citadel Securities LLC v. HFT Solutions LLCfiled Dec 3, 2025IPR2026-00151Patent Trial and Appeal Board (PTAB)Pending
Defendants: HFT Solutions LLC
- HFT Solutions LLC v. Optiver US LLCfiled Sep 8, 20257:25-cv-00415U.S. District Court for the Western District of TexasOngoing litigation
Defendants: Optiver US LLC
- HFT Solutions LLC v. Citadel Securities LLCfiled Dec 24, 20241:24-cv-13213U.S. District Court for the Northern District of IllinoisOpen and ongoing
Defendants: Citadel Securities LLC
- HFT Solutions LLC v. Jump Trading LLCfiled Dec 24, 20241:24-cv-13214U.S. District Court for the Northern District of IllinoisOngoing litigation
Defendants: Jump Trading LLC
Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
Known litigation involving US patent 11575381 as of April 26, 2026, includes the following cases:
HFT Solutions LLC v. Optiver US LLC
- Plaintiff(s): HFT Solutions LLC
- Defendant(s): Optiver US LLC
- Jurisdiction: U.S. District Court for the Western District of Texas
- Case Number: 7:25-cv-00415
- Filing Date: September 8, 2025
- Status: Ongoing litigation.
HFT Solutions LLC v. Citadel Securities LLC
- Plaintiff(s): HFT Solutions LLC
- Defendant(s): Citadel Securities LLC
- Jurisdiction: U.S. District Court for the Northern District of Illinois
- Case Number: 1:24-cv-13213
- Filing Date: December 24, 2024
- Status: Open and ongoing, with several deadlines set for infringement contentions, claim terms, and claim construction briefs in 2026. A telephonic status hearing is scheduled for May 13, 2026.
HFT Solutions LLC v. Jump Trading LLC
- Plaintiff(s): HFT Solutions LLC
- Defendant(s): Jump Trading LLC
- Jurisdiction: U.S. District Court for the Northern District of Illinois
- Case Number: 1:24-cv-13214
- Filing Date: December 24, 2024
- Status: Ongoing litigation.
Citadel Securities LLC v. HFT Solutions LLC (PTAB IPR)
- Plaintiff(s) (Petitioner): Citadel Securities LLC
- Defendant(s) (Patent Owner): HFT Solutions LLC
- Jurisdiction: Patent Trial and Appeal Board (PTAB)
- Case Number: IPR2026-00151
- Filing Date: December 3, 2025
- Status: Pending.
Generated 5/27/2026, 12:47:44 PM