TL;DR:
The December 1, 2025 amendments to the Federal Circuit Rules have taken effect as of May 6, 2026, introducing new forms and several key changes designed to tighten filings and improve conflict checks in appellate practice. Notably, Form changes to 10, 26, and new Forms 35 and 36 align submissions with a more robust corporate-disclosure regime, and Rule 29 now imposes explicit corporate-ownership disclosures, including stock tickers, to support electronic conflict-checking. Litigators handling appeals should update filing templates, corporate-disclosure language, and conflict-detection protocols to avoid delays or disputes in the appellate record. (cafc.uscourts.gov)
What changed and when it matters
On May 6, 2026, the U.S. Court of Appeals for the Federal Circuit announced that the December 1, 2025 amendments to the Federal Circuit Rules of Practice go into effect today. The final version of the Federal Circuit Rules and new forms—specifically updates to Forms 10 and 26 and the adoption of new Forms 35 and 36—apply to filings made on or after December 1, 2025, with the changes now operative for practice in 2026. This procedural overhaul is designed to streamline conflict checks and disclosures in appellate proceedings, reflecting the broader push toward more transparent corporate ownership information in filings. (cafc.uscourts.gov)
The amendments encompass several notable shifts. First, the court’s notice confirms the adoption of changes to Forms 10 and 26, and the addition of Forms 35 and 36 to accompany the amended rules. Practitioners should expect these forms to appear in available filing templates and must use them for relevant submissions going forward. (cafc.uscourts.gov)
Second, the amendments alter substantive and local practice in important ways. The changes to Rule 29 (Filing and Service; corporate listing) and related provisions introduce enhanced corporate-disclosure requirements. Specifically, counsel must identify parent corporations and any publicly held company owning 10% or more of the stock, with stock tickers where applicable, to support conflict-checking and ensure the court can identify potential conflicts efficiently. The updated rule package also expands the information required in corporate-disclosure statements and tightens the timeliness and format requirements for filings. (supremecourt.gov)
Third, several provisions tie into the court’s conflict-checking infrastructure by requiring stock ticker information for entities listed in petitions and merits briefs. The amendments specify that stock ticker symbols be submitted for businesses that have them, aiding the electronic conflict-checking system and ensuring that all relevant parties are properly identified in filings. These changes are described in the final Rules package and commentary accompanying the revisions. (supremecourt.gov)
Finally, the overall project aligns with the federal judiciary’s ongoing modernization of the Rules of Practice and Procedure in light of a growing emphasis on electronic filing and automated conflict checks. The Federal Circuit’s notice confirms the December 1, 2025 amendments and their operative effect date, directed at improving efficiency and accuracy in appellate practice. (cafc.uscourts.gov)
Practical impact for trial and appellate teams
Enhanced corporate disclosures at filing. The updated Rules require more robust disclosure of corporate relationships and ownership, including tickers for publicly held parents and 10% holders. This is not just a formality; it directly affects how conflicts are screened and how the court assesses potential conflicts of interest. Practitioners should ensure their briefs and notices include complete corporate disclosures consistent with the new requirements, or risk jeopardizing jurisdiction or triggering motions to strike. (supremecourt.gov)
New and updated filing forms. With Form 10, Form 26 updated and new Forms 35 and 36, appellate teams will need to adjust templates for petitions, briefs, and appendices. The federal appellate process increasingly relies on standardized, machine-readable metadata to support conflict checks and docketing. Firms should coordinate with their e-filing teams to ensure internal templates are synchronized with the new forms and that staff are trained to gather the required corporate-ownership data early in the filing cycle. (cafc.uscourts.gov)
Conflict-checking reliability. The amendments purposefully strengthen electronic conflict checks by coupling corporate disclosures with the filing process. For trial teams, this reduces the risk of late-stage conflict challenges that could derail an appeal or require corrections after filing. It also underscores the value of early fact-finding in case management, where counsel gathers corporate-structure information at the outset of an appeal to minimize later disputes. (supremecourt.gov)
Timing and procedure considerations. While the substantive changes focus on disclosures and forms, there are clear procedural implications for docketing and service. Firms should review internal deadlines, ensure that all filings meet the revised format requirements, and confirm that the right versions of the forms are being used for each filing type. The May 6, 2026 effective date gives practitioners a concrete milestone to align training, templates, and QA processes. (cafc.uscourts.gov)
Practical next steps for your firm
Audit corporate disclosures. Create a short internal checklist to verify that every appellate submission includes the required corporate-disclosure information, including parent-subsidiary relationships and tickers for publicly held entities. Update disclosure language in templates to reflect the new Rule 29.6 requirements. (supremecourt.gov)
Update filing templates and systems. Replace legacy Forms 10 and 26 in internal templates with the updated versions, and integrate Forms 35 and 36 where applicable. Work with the e-filing team to ensure that the new formats and required data fields populate correctly in drafts and final filings. (cafc.uscourts.gov)
Build a conflict-checking playbook. Because the amendments enhance automated conflict checking, trial teams should establish a standard operating procedure for collecting and verifying corporate-ownership data at the outset of appellate matters. This reduces the chance of last-minute review delays or disputes over conflicts. (supremecourt.gov)
Train junior practitioners and staff. Conduct a brief training session focused on the new forms, the expanded corporate-disclosure requirements, and the importance of tickers in conflict checks. A standardized internal memo can help ensure consistency across cases and circuits. (cafc.uscourts.gov)
Consider the broader ecosystem of trial-readiness tools. While this development centers on appellate procedure, trial teams can leverage objective objection and evidence-training resources to sharpen courtroom readiness in parallel with appellate diligence. Platforms and programs that emphasize precise, fact-based advocacy alignment with rules of procedure can complement the updated appellate process. (For context on how modern evidence and trial-preparation tools interface with current rules and practice, see authoritative court materials and practitioner-focused resources.)
Bottom line for litigators
The Federal Circuit’s December 1, 2025 amendments, now in effect as of May 6, 2026, mark a meaningful shift in appellate practice with a strong emphasis on transparent corporate disclosures and robust conflict checks. The introduction of new forms and the tightening of ownership disclosures mean that appellate teams must modernize templates, tighten disclosures, and align with enhanced electronic-diligence capabilities. By adapting early, firms can reduce the risk of procedural hiccups and keep post-trial avenues moving smoothly.
Sources:
- Notice of New Federal Circuit Rules and Court Forms, United States Court of Appeals for the Federal Circuit, published May 6, 2026. This notice confirms the December 1, 2025 amendments and the adoption of new Forms 35 and 36, updates to Forms 10 and 26, and their effective date. (cafc.uscourts.gov)
- Federal Circuit Rules of Practice and accompanying Forms, including December 1, 2025 amendments and corporate-disclosure requirements under Rule 29. The final rule package shows the corporate listing requirements and stock-ticker disclosures designed to support electronic conflict-checking. (cafc.uscourts.gov)
- Commentary and context on conflict-checking and evidentiary practice may be found in related federal judiciary communications and practice notes. (supremecourt.gov)