Headwater Research LLC v. Supercell Oy

This patent infringement lawsuit, filed on September 18, 2025, in the Eastern District of Texas, involves Headwater Research LLC as the plaintiff and Supercell Oy as the defendant, and centers on US Patent 9615192 B2. Headwater Research LLC is a non-practicing entity (NPE) or patent assertion entity (PAE) known for its extensive patent portfolio focused on mobile device intelligence, background data management, network optimization, and wireless communication technologies. Headwater has a history of aggressive litigation, securing substantial verdicts and settlements against major technology companies like Samsung and Verizon for alleged infringement of its mobile technology patents. The defendant, Supercell Oy, is a Finnish mobile game development company renowned for its popular free-to-play titles such as Clash of Clans, Clash Royale, and Brawl Stars, which generate significant revenue through in-game microtransactions and rely on robust online network functionality.

The specific accused products in this case are Supercell's mobile games and the underlying network and data management technologies that enable their online features. The sole patent at issue, US Patent 9615192 B2, is titled "Message link server with plural message delivery triggers" and broadly relates to telephonic communication, particularly concerning metering, time-control, or billing arrangements for wireless communications based on usage statistics or network monitoring, within the broader field of information and communication technology. Headwater's broader patent portfolio, from which this patent likely stems, focuses on mobile device operating system enhancements, cloud technology, and smart mobile networking services that facilitate efficient high-speed data connections and manage application network access demand.

The case is being heard in the Eastern District of Texas, a venue historically favored by patent plaintiffs, particularly NPEs, due to its reputation for a fast-paced "rocket docket," plaintiff-friendly juries, and local rules that can make litigation expensive for defendants. While the assigned District Judge is not explicitly stated in the provided information, Magistrate Judge Roy S. Payne has been involved in handling motions, including an opposed motion to stay proceedings. This case is notable given Headwater Research's prolific assertion campaign against prominent tech companies and Supercell's position as a leading mobile game developer, highlighting the ongoing patent assertion risks within the lucrative mobile gaming industry, particularly concerning backend network and data management features that are critical to modern online games. Supercell has previously faced and lost patent infringement suits regarding its games' network features in the Eastern District of Texas.

Headwater Research LLC v. Supercell Oy (2:25-cv-00964 E.D. Tex.) is an active patent infringement case involving US Patent 9,615,192 B2.

Here is a chronological summary of the key legal developments:

Filing & Initial Pleadings:

• Complaint Filed (2025-09-18): Headwater Research LLC filed a Complaint for Patent Infringement against Supercell Oy in the U.S. District Court for the Eastern District of Texas. The complaint asserts that Supercell's games infringe US Patent 9,615,192 B2, which relates to a "MESSAGE LINK SERVER WITH PLURAL MESSAGE DELIVERY TRIGGERS".

Pre-Trial Motions of Substance:

• Motion to Stay Proceedings (Opposed): Supercell Oy filed an "OPPOSED MOTION to Stay Proceedings" (Motion 21). This motion likely seeks to pause the district court litigation pending the outcome of related inter partes review (IPR) proceedings at the Patent Trial and Appeal Board (PTAB).
• Hearing on Motion to Stay: A motion hearing on the opposed motion to stay was initially set for March 18, 2026, but was canceled and reset. It was later set for April 22, 2026, before Magistrate Judge Roy S. Payne.
• Related Filings on Stay Motion: The parties engaged in further briefing related to the motion to stay, including sealed responses and replies concerning supplemental filings.

Claim Construction (Markman) Outcomes:

• As of May 29, 2026, there is no public record of a Markman (claim construction) hearing or order in this case. Given the relatively recent filing date and ongoing dispute over a motion to stay, it is likely that claim construction has not yet occurred.

Discovery Milestones:

• No specific discovery milestones with strategic significance have been publicly reported for this case.

Trial Events, Verdict, and Post-Trial Motions:

• The case is still in its early pre-trial phase, and no trial events, verdicts, or post-trial motions have occurred.

Settlement, Dismissal, Judgment, or Appeal:

• The case remains "Open" and "Active" in the Eastern District of Texas. There has been no reported settlement, dismissal, judgment, or appeal.

Parallel PTAB IPR/PGR Proceedings:

• IPR2026-00088: An Inter Partes Review (IPR) was filed against US Patent 9,615,192 B2, the patent at issue in this litigation. This IPR is currently listed as "Pending - Instituted". The institution of this IPR likely forms a significant basis for Supercell's motion to stay the district court proceedings.
• IPR2026-00154: Another IPR was filed against US Patent 9,615,192 B2, but it was listed as "Not Instituted - Procedural".
• Related IPRs on other Headwater Research LLC patents: In IPR2026-00153, filed by Target Corporation against Headwater Research LLC concerning US Patent 10,321,320, Headwater Research LLC identified its case against Supercell Oy (2:25-cv-00964) as a related matter. This indicates a broader litigation strategy by Headwater Research LLC involving multiple patents and defendants, with PTAB proceedings potentially affecting various district court cases.

I'll research plaintiff's counsel for this case. Let me run several searches.

Let me dig deeper into the docket entries and appearances for plaintiff's counsel.

Plaintiff's Counsel of Record — Headwater Research LLC

Bottom line: Headwater is represented by its long-time patent litigation firm Russ August & Kabat LLP (RAK), Los Angeles, CA, which is the firm that filed the complaint in this case. RAK's standard Headwater team (Fenster, Mirzaie, Ledahl, Rubin, Wang, Milkey, et al.) appears across Headwater's parallel campaigns. I could not retrieve the actual "Notice of Attorney Appearance" docket entries for 2:25-cv-00964 (the PACER Monitor snapshot of this docket only exposes the earliest filings, ECF 1–7), so the list below is built from the complaint signature/filing metadata, the PTAB service lists in the parallel Headwater IPRs (which name the same counsel on the Supercell-related '320 patent), and the Law360 firm/attorney docket tracker. Treat the "of counsel" tier as well-sourced but not docket-confirmed for this specific case.

Lead / principal counsel

Additional attorneys appearing for Headwater (of counsel tier)

Sourced from the PTAB "Updated Mandatory Notices" in IPR2026-00106 (Amazon v. Headwater, '320 patent), which lists Headwater Research LLC v. Supercell Oy, No. 2-25-cv-00964 (EDTX) as a related matter and serves Headwater's litigation counsel at RAK. All are Russ August & Kabat, Los Angeles:

• Neil A. Rubin (CA Bar No. 250761) — nrubin@raklaw.com
• Philip X. Wang (CA Bar No. 262239) — pwang@raklaw.com
• James A. Milkey (CA Bar No. 281283) — jmilkey@raklaw.com
• Dale Chang — dchang@raklaw.com (appears on the Headwater litigation service list)
• James S. Tsuei (CA Bar No. 285530) — RAK; a regular Headwater E.D. Tex. filer
• Jason M. Wietholter (CA Bar No. 337139) — RAK; argued for Headwater at the Samsung trial (transcript: "Jason Wietholter on behalf of Headwater Research")
• Qi Tong — RAK; Law360's firm tracker lists her as an attorney on Headwater Research LLC v. Supercell Oy, filed Sept. 18, 2025 (E.D. Tex.)

Generic service mailbox used by the team: rak_headwater@raklaw.com / headwater@raklaw.com.

Local counsel

Not confirmed for this case. In Headwater's E.D. Tex. Samsung case, the local/regional counsel was Andrea L. Fair of Miller Fair Henry PLLC, Longview, TX (Texas Bar No. 24078488), who is documented as having served as local counsel in the Headwater–Samsung and Headwater–Verizon trials. That same Longview team is a plausible local-counsel choice here, and RAK would need local counsel for pro hac vice admission in the Marshall Division — but I found no docket entry, order, or firm announcement confirming Miller Fair Henry (or any other Texas firm) has appeared for Headwater in 2:25-cv-00964. Do not treat it as a confirmed appearance.

Caveats / what I could not verify

1. No docket-confirmed appearance notices. The publicly mirrored docket (PACER Monitor, Docket Alarm, RPX Empower) shows ECF 1–7 only (complaint, AO 120, disclosure statement, summons) and does not expose the "NOTICE of Attorney Appearance" entries that would formally list every attorney of record. I therefore cannot give you ECF numbers for individual appearances.
2. Firm-sourced inference, flagged as such. The "of counsel" names come from Headwater's PTAB service lists in the related IPRs and the Law360 firm tracker, not from this docket sheet. RAK staffs these Headwater cases with a stable team, so this is a high-confidence but not docket-verified inference for this specific case file.
3. No in-house counsel for plaintiff identified. Headwater Research LLC appears to be a patent-holding/monetization entity (linked to ItsOn-heritage mobile-networking patents, inventor Dr. Greg Raleigh); I found no in-house attorney of record for it in this case.
4. Contradiction to flag against the prior sections. The case metadata and the prior "Key Legal Developments" section say the sole patent at issue is the '192 patent. The Court's own Memorandum Order in this case recites that Headwater's First Amended Complaint (Dkt. 6) asserts three patents — U.S. 9,198,117, 9,615,192, and 10,321,320. That is a direct contradiction with the single-patent framing and should be corrected upstream.
5. Newer developments than the prior sections reflect. The prior sections describe the stay motion as still pending with an April 22, 2026 hearing. Per GovInfo, Magistrate Judge Payne denied the motion to stay (Dkt. 21) on Sept. 23, 2026, and Judge Gilstrap adopted the Report and Recommendation and denied Supercell's motion to dismiss (Dkt. 20) on Sept. 29, 2026. Both are more recent than the previously generated "Key Legal Developments" text.

Sources: PACER Monitor docket snapshot for 2:25-cv-00964 (cdn.pacermonitor.com/public/case/60216310); GovInfo docket/orders for 2:25-cv-00964 (memorandum order re Dkt. 21, and order adopting R&R re Dkt. 20); PTAB IPR2026-00106 Updated Mandatory Notices (docketalarm.com PDF) listing RAK/Headwater service addresses and the Supercell related case; PTAB IPR2024-01396 service list (naming Mirzaie, Fenster, Chang, Milkey, Rubin, Wang at RAK); RAK press release re Verizon verdict (raklaw.com); Miller Fair Henry press release and Texas Super Lawyers coverage re Andrea Fair as Headwater local counsel; Law360 firm/attorney page for Qi Tong listing this case.

Based on the available information, specific outside counsel of record representing Supercell Oy in Headwater Research LLC v. Supercell Oy, case number 2:25-cv-00964, has not been explicitly identified in the provided search results. While Supercell Oy has been involved in prior patent litigation, where firms such as Fenwick & West LLP and Kilpatrick Townsend & Stockton LLP have represented them (e.g., in a mandamus petition related to cases with GREE Inc.), this information does not confirm their representation in the current Headwater Research case.

Supercell Oy does have internal legal counsel who would be involved in managing the litigation. These include:

• Markku Ignatius (General Counsel & Public Affairs)

  • Firm: Supercell Oy, Helsinki, Finland (In-house)
  • Experience Note: Mr. Ignatius has extensive experience in the legal field, holding various General Counsel and Legal Counsel positions with companies like Supercell, Zed, Sonera Corporation, and Sulake.

• Celia Fagerström (Senior Legal Counsel, Game Ops & Game Tech)

  • Firm: Supercell Oy, Helsinki, Finland (In-house)
  • Experience Note: Ms. Fagerström is listed as a Senior Legal Counsel at Supercell, with a focus on game operations and technology.

Docket entries for the Headwater Research LLC v. Supercell Oy case mention activity, including sealed motions filed by Supercell Oy, but do not specifically name their appearing outside counsel in the provided snippets. Therefore, while Supercell's in-house legal team is involved, the specific external law firm(s) and attorneys formally appearing as counsel of record for Supercell Oy in this particular case are not explicitly stated in the current search results.