PTAB challenges

Proceedings overview

There is one AIA trial proceeding on file for US Patent 11329655, which is currently pending. This means the patent's claims have not yet been subjected to a final validity determination by the PTAB, and the defensive posture remains uncertain.

IPR2026-00387 — Optiver US LLC et al. v. HFT Solutions LLC

• Type: Inter Partes Review
• Filed: 2026-06-05
• Status: Pending – The petition has been filed and the proceeding is in its initial stages.
• Judge panel: Information not yet publicly available due to the recent filing date.
• Petition grounds: Information regarding specific claims challenged, prior art references, and statutory bases (§ 102 / § 103) is not yet publicly available through standard search queries due to the very recent filing date.
• Institution decision: Not yet issued. The PTAB typically has six months from the date of the preliminary response (or waiver thereof) to decide whether to institute review. Given the filing date of 2026-06-05, an institution decision is not expected until late 2026 or early 2027.
• Final Written Decision: Not applicable; a Final Written Decision has not been issued as the case is in its early pending stage.
• Settlement / termination: Not applicable; no settlement or termination has been reported for this recently filed proceeding.
• Appeal: Not applicable; no appeal has occurred as the proceeding is in its early pending stage.
• Defensive value: This proceeding is in its nascent stage. Its outcome is uncertain, and it does not currently provide any definitive defensive value for a defendant facing assertion of this patent. The potential impact will depend entirely on whether the PTAB institutes review and, subsequently, on the claims challenged and the eventual Final Written Decision.

Strategic summary

Only one Inter Partes Review, IPR2026-00387, has been filed against US Patent 11329655 by Optiver US LLC et al. This proceeding was filed very recently, on 2026-06-05, and is currently in a pending status. As such, no claims of US Patent 11329655 have been canceled, sustained, or definitively tested through an AIA trial proceeding. All claims remain untested by a final PTAB decision.

The estoppel landscape has not yet been formed for this patent. Should IPR2026-00387 proceed to a final written decision, the petitioner (Optiver US LLC et al.) and their privies would be estopped under 35 U.S.C. § 315(e)(2) from asserting invalidity grounds that were raised or reasonably could have been raised in the IPR. However, for other potential defendants, all prior art grounds remain available for challenge until a final decision is issued. There are no clear pattern signals to observe yet, as this is the first and only AIA proceeding filed against this patent.

Recommended next steps

For IPR2026-00387, the patent owner's preliminary response deadline will typically be three months from the notice of filing date, and the institution decision is due approximately six months after that. Interested parties should monitor the PTAB's Patent Trial and Appeal Board End to End (PTAB E2E) system for updates on the filing of the petition, the patent owner's preliminary response, and eventually, the institution decision. The absence of prior PTAB activity means that the patent's claims have not been subject to administrative validity review, which could make it an attractive target for future IPRs if it is asserted.