Citadel Securities LLC vs. HFT Solutions, LLC

Explore the PTAB proceeding IPR2026-00151 filed by Citadel Securities LLC on 2025-12-03. This includes filing dates, application numbers, tech centers, patent numbers, and current case status.

Proceeding Overview

Proceeding Number

IPR2026-00151

Filing Date

2025-12-03

Accorded Filing Date

2025-12-03

Institution Decision Date

2026-05-19

Last Modified Date

2026-06-19

Proceeding Type

IPR

Termination Date

2026-05-19

Trial Status

Institution Denied

Parties & Counsel

Petitioner

Citadel Securities LLC

Represented By

Fasulo, Meg

Patent Owner / Respondent

HFT Solutions, LLC

Represented By

Chang, Daleet al

Tribunal & Venue

Tribunal

Patent Trial and Appeal Board (USPTO)

Technology Center

TC 2800 - Semiconductors, Electrical & Optical Systems

Patent Information

1 Patent Involved

Respondent Application Number 17723145

Respondent Patent Number 11575381

External Links

Espacenet

Google Patents

Respondent Inventor Nima Badizadegan

Respondent Tech Center TC 2800 - Semiconductors, Electrical & Optical Systems

Address and Attorney/Agent Information

23 Registered Practitioners

Power of Attorney & Correspondence

Firm / Entity Name AMSTER, ROTHSTEIN & EBENSTEIN LLP

Customer Number 1912

Address 405 LEXINGTON AVENUE, FLOOR 48, NEW YORK, NY, 10174, UNITED STATES

Attorney / Agent Information

Reg #	Name	Phone
22031	Christopher Dunham	212-278-0400
24490	Jeffrey Schwab	212-885-9215
25871	Philip Gottfried	212-336-8000
27476	Neil Zipkin	212-336-8120
28678	John White	212-336-8193
29403	Anthony Lo Cicero	212-697-5995
30259	Kenneth George	212-336-8090
31643	Douglas Miro	212-336-8000
32781	Charles Macedo	212-336-8000
38557	Marion Metelski	212-336-8077
39992	Gary Gershik	212-336-8000
40837	Paul Teng	516-424-5401
41834	Steven Hertzberg	212-336-8060
42889	Alan Miller	212-336-8000
45343	Brian Comack	212-336-8000
46494	Benjamin Halpern	212-336-8095
51431	Keith Barkaus	212-382--0700
63679	Brian Amos	212-336-8123
69386	Hajime Sakai	212-336-8124
80964	Darren Haber	212-336-8192
81259	Thomas Hart	212-336-8000
81535	Andrew Gorman	212-336-8186
81796	Adam Kravitz	949-292-4912

Proceeding Documents

Institution Decision: Deny DECISION

2026-05-19 FILING PARTY: BOARD

Download

Director Discretionary Decision: Refer RESPONSE

2026-04-01 FILING PARTY: BOARD

Download

1047

Fasulo Email re Indefiniteness Claims Exhibit

2026-03-13 FILING PARTY: PETITIONER

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Notice of Withdrawal of Indefiniteness Claims NOTICE

2026-03-13 FILING PARTY: PETITIONER

Download

PATENT OWNER'S UPDATED POWER OF ATTORNEY NOTICE

2026-03-13 FILING PARTY: PATENT OWNER

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Citadel Securities LLC vs. HFT Solutions, LLC

Proceeding Overview

Parties & Counsel

Petitioner

Citadel Securities LLC

Represented By

Patent Owner / Respondent

HFT Solutions, LLC

Represented By

Tribunal & Venue

Patent Information

Address and Attorney/Agent Information

Power of Attorney & Correspondence

Attorney / Agent Information

Proceeding Documents

Institution Decision: Deny DECISION

Director Discretionary Decision: Refer RESPONSE

Fasulo Email re Indefiniteness Claims Exhibit

Notice of Withdrawal of Indefiniteness Claims NOTICE

PATENT OWNER'S UPDATED POWER OF ATTORNEY NOTICE

PATENT OWNER'S UPDATED MANDATORY NOTICES NOTICE

HFT v Citadel Securities DI 70 Exhibit

HFT v Citadel Securities DI 46 Exhibit

Patent Law 101 - The View from the Bench (M. Sipe) Exhibit

Docket Navigator Analytics (Time to Trial, ND IL) Exhibit

HFT v Citadel Securities DI 66 Exhibit

HFT v Citadel Securities DI 52 Exhibit

PATENT OWNER'S PRELIMINARY RESPONSE POPR

U.S. Patent No. 10,931,286 Exhibit

Plaintiff's Stipulation OTHER

Exhibit 2012 - Internet Archive Redirect Failure from Website Identified in Ex. 1009 Exhibit

Exhibit 2011 - Declaration of Dale Chang In Support of Patent Owner’s Preliminary Response Exhibit

HFT Initial Disclosures (HFT v Citadel Securities) Exhibit

Docket Navigator Analytics (Motion Success by Year, National) Exhibit

Letter from Kelson to Chang Exhibit

HFT v Citadel Securities DI 34 Exhibit

Citadel Securities Initial Disclosures (HFT v Citadel Securities) Exhibit

HFT v Jump Trading DI 42 Exhibit

HFT v Jump Trading DI 30-1 Exhibit

Petitioner's Response in Opposition to Patent Owner's Request for Discretionary Denial of Institution RESPONSE

NDIL Local Patent Rules Exhibit

Order Granting Petitioner’s Motion for Admission Pro Hac Vice of Matthew R. Ford ORDER

Petitioner's Motion for Pro Hac Vice Admission of Matthew R. Ford Under 37 C.F.R. 42.10(c) MOTION

Exhibit 2004 - HFT Solutions, LLC v. Citadel Securities LLC, 1:24-cv-13214 – Order Denying Motion to Dismiss Exhibit

Exhibit 2006 - HFT Solutions, LLC v. Citadel Securities LLC, 1:24-cv-13214 – Agreed Schedule Exhibit

Exhibit 2009 - U.S. Patent No. 10,931,286 Exhibit

Exhibit 2005 - HFT Solutions, LLC v. Citadel Securities LLC, 1:24-cv-13214 (N.D. Ill.) – Final Invalidity Contentions Exhibit

Exhibit 2008 - HFT Solutions, LLC v. Citadel Securities LLC, 1:24-cv-13214 – Citadel Securities Answer, Affirmative Defenses, and Counterclaims Exhibit

Exhibit 2010 - Email title “HFT v. Citadel – deadlines” from Meg Fasulo to Dale Chang dated May 2, 2025 Exhibit

Exhibit 2002 - HFT Solutions, LLC v Optiver US LLC et al, Case No. 7:25-cv-00415 - Scheduling Order Exhibit

Exhibit 2007 - HFT Solutions, LLC v. Citadel Securities LLC, 1:24-cv-13214 –Final Invalidity Contentions Exhibit B-3 Exhibit

Exhibit 2001 - HFT Solutions, LLC v. Jump Trading LLC, 1:24-cv-13214 - Agreed Schedule Exhibit

Exhibit 2003 - HFT Solutions, LLC v. Citadel Securities LLC, 1:24-cv-13214 – Motion to Dismiss Exhibit

PATENT OWNER’S REQUEST FOR DISCRETIONARY DENIAL OF INSTITUTION RESPONSE

Notice: Mandatory Notice NOTICE

Notice: Power of Attorney NOTICE

Notice: Notice filing date accorded NOTICE

The Race to Zero Latency for High Frequency Trading Exhibit

Silicon Labs Si4345-44 Family Reference Manual Exhibit

Interactive Brokers Founder Changed Trading Forever (Barrons) Exhibit

A. Frank D'Souza, Design of Control Systems Exhibit

Affidavit of Mina Chung (Stratix Handbook) Exhibit

List and Comparison of FPGA Companies Exhibit

Altera and IDT Synchronous Ethernet Solution for ITU-T G.8262 Exhibit

Stratix V Device Handbook Exhibit

Altera, Clock Networks and PLLs in Stratix V Devices Exhibit

Affidavit of Mina Chung (Altera) Exhibit

HFT Solutions' Response in Opposition to Motion to Dismiss Exhibit

FPGA accelerated low-latency market data feed processing (Morris et al) Exhibit

HFT Solutions, LLC's Infringement Contentions Exhibit

Irene Aldridge, High Frequency Trading (Second Edition) Exhibit

Petition for Inter Partes Review PETITION

Lockwood, A Low-Latency Library in FPGA Hardware (HFT) Exhibit

The Once and Future Ethernet Exhibit

Exploring Algorithmic Trading in Reconfigurable Hardware Exhibit

Notice: Power of Attorney NOTICE

Implementing Fractional PLL Reconfiguration with Altera PLL Exhibit

UltraScale Architecture Clocking Resources User Guide Exhibit

An Introduction to Synchronized Internet Exhibit

U.S. Patent No. 10,169,814 Exhibit