The Federal Circuit’s decision in Insulet Corp. v. EOFlow, Co. Ltd., Case No. 25-1807 (Fed. Cir. May 28, 2026), arrives just days after the court’s major trade secret decision in Versata v. Ford, continuing what is becoming a significant period of doctrinal development under the Defend Trade Secrets Act (“DTSA”). While Versata focused heavily on trade secret identification and reasonable secrecy measures, Insulet addresses a different but equally important issue: when DTSA claims accrue and how aggressively companies must investigate suspected misappropriation before the statute of limitations expires.
The opinion addresses several issues with broad implications for technology companies and trade secret litigators, including:
- when the DTSA statute of limitations begins to run;
- whether trade secret claims accrue trade-secret-by-trade-secret or as part of a single continuing misappropriation;
- the role of “access plus similarity” in pleading and proving trade secret misappropriation; and
- how aggressively companies must investigate competitors once warning signs appear.
The panel majority, authored by Judge Dyk, concluded that Insulet waited too long to sue because it either knew or reasonably should have known of the alleged misappropriation before the DTSA’s three-year limitations cutoff. Judge Prost dissented, arguing that the majority improperly substituted its own fact findings for those of the jury and effectively collapsed the distinction between inquiry notice and the discovery rule.
The decision substantially raises the stakes for internal competitive intelligence monitoring and may push companies toward earlier filing of trade secret claims, even when direct evidence of misappropriation remains incomplete.
Background: Insulin Patch Pumps and Former Employees
Insulet manufactures the Omnipod wearable insulin patch pump. EOFlow developed a competing product known as the EOPatch. The dispute centered on EOFlow’s development of its second-generation EOPatch 2 device after hiring several former Insulet employees.
Insulet alleged that former employees, particularly former Director of Mechanical Engineering Steve DiIanni, disclosed confidential Omnipod information to EOFlow in 2018, including:
- CAD files;
- soft cannula designs and manufacturing details;
- design history file information; and
- an occlusion-detection algorithm.
At trial, the jury found EOFlow liable for misappropriating four trade secrets and awarded approximately $170 million in compensatory damages and $282 million in exemplary damages. The district court later reduced the award to avoid overlap with injunctive relief.
The Federal Circuit reversed entirely.
The Core Holding: The DTSA Clock Started Earlier Than Insulet Claimed
The DTSA requires trade secret claims to be brought within three years after the misappropriation “is discovered or by the exercise of reasonable diligence should have been discovered.”
A central dispute involved whether the statute uses:
- an “inquiry notice” standard, where the limitations clock starts once circumstances would prompt investigation; or
- a stricter “discovery rule” standard derived from Merck & Co. v. Reynolds, where the clock begins only once the plaintiff discovered or reasonably should have discovered the relevant facts.
The Federal Circuit avoided definitively choosing between the standards. Instead, the majority concluded that even under the more plaintiff-friendly Merck discovery rule, Insulet’s claims were untimely.
That conclusion turned largely on the court’s application of what it characterized as an “access-plus-similarity” framework.
The “Access Plus Similarity” Framework
The Federal Circuit held that a DTSA plaintiff can sufficiently plead trade secret misappropriation using circumstantial evidence showing:
- access to trade secrets; and
- similarities between the trade secrets and the accused product.
The court relied heavily on precedent interpreting the Uniform Trade Secrets Act (“UTSA”), including:
- Seatrax, Inc. v. Sonbeck International;
- Leggett & Platt, Inc. v. Hickory Springs Manufacturing;
- Heraeus Medical GmbH v. Esschem; and
- Sokol Crystal Products, Inc. v. DSC Communications Corp.
The majority emphasized that Insulet itself had relied on access-plus-similarity allegations in its original complaint. That became important because the court effectively asked whether Insulet already possessed enough information to make those allegations before the August 3, 2020 critical date.
The answer, according to the majority, was yes.
Why the Court Found Insulet Had Sufficient Knowledge Before the Critical Date
The court pointed to extensive evidence showing that Insulet knew about EOFlow’s competing product and the involvement of former Insulet personnel well before August 2020.
The opinion highlighted internal Insulet communications following the 2018 ADA conference, including statements such as:
- “EOFlow has cloned our product”;
- “looks almost identical to Omnipod”; and
- “we need to see if this solution is based on our IP.”
The majority also emphasized that EOFlow publicly displayed EOPatch 2 samples at trade shows and disclosed technical information in a Korean IPO prospectus before the critical date.
Judge Dyk’s opinion methodically walked through specific allegedly similar features, including:
- walking-man hook and ratchet gears;
- plunger screw and nut configurations;
- reservoir and O-ring structures; and
- soft cannula seal features.
Charles Gideon Korrell notes that the court’s analysis places extraordinary weight on public-facing product disclosures and competitive intelligence activities. Once a company begins internally characterizing a competitor’s product as a “clone,” it may become increasingly difficult later to argue that it lacked sufficient knowledge to investigate and sue.
The Single-Claim Theory of Continuing Misappropriation
One of the most significant portions of the opinion involves the Federal Circuit’s treatment of continuing misappropriation under 18 U.S.C. § 1836(d).
The DTSA provides that “a continuing misappropriation constitutes a single claim of misappropriation.”
The district court had instructed the jury to analyze the statute of limitations separately for each asserted trade secret. The Federal Circuit rejected that approach.
Instead, the majority adopted reasoning derived from California UTSA precedent, particularly:
- Intermedics, Inc. v. Ventritex, Inc.;
- Glue-Fold, Inc. v. Slautterback Corp.; and
- MGA Entertainment, Inc. v. Mattel, Inc.
Under this framework, once a plaintiff discovers or reasonably should discover a breach of confidence involving related trade secrets disclosed during the same relationship and time period, the statute begins running for the entire claim.
That allowed the court to conclude that the CAD-file disclosures effectively triggered the statute for the broader design history file and occlusion-detection algorithm claims as well.
Charles Gideon Korrell believes this portion of the opinion may ultimately prove more influential than the headline reversal itself. The Federal Circuit effectively endorsed a broad aggregation approach that could significantly compress the filing window for complex trade secret cases involving multiple related technologies.
The Dissent: The Majority Reweighed the Evidence
Judge Prost’s dissent is unusually forceful. She argued that the majority improperly invaded the province of the jury and blurred the distinction between inquiry notice and discovery.
The dissent stressed that:
- former employees frequently join competitors legitimately;
- superficial product similarity alone should not trigger immediate litigation;
- EOFlow allegedly concealed aspects of its product from inspection; and
- the record contained substantial evidence supporting the jury’s verdict.
Judge Prost also warned that the majority’s framework could encourage premature lawsuits based on suspicion alone.
Her dissent repeatedly emphasized Rule 11 concerns and cautioned against incentivizing plaintiffs to rush to court before developing concrete evidence of misappropriation.
Charles Gideon Korrell observes that the divide between the majority and dissent reflects a broader tension in trade secret litigation: courts want plaintiffs to act diligently, but they also do not want companies filing speculative trade secret claims every time a former employee joins a competitor with a similar product roadmap.
The Jurisdiction Discussion Is Also Important
The Federal Circuit also addressed an issue that could become increasingly relevant in mixed patent-and-trade-secret litigation.
After trial, the patent claims had been dismissed “without prejudice.” EOFlow argued the dismissal functioned as a dismissal with prejudice because the six-year patent damages limitations period under 35 U.S.C. § 286 had already expired for at least some alleged acts of infringement.
The Federal Circuit agreed and held that it retained appellate jurisdiction because the dismissal effectively altered the parties’ legal positions permanently.
The court relied on:
- Chamberlain Group, Inc. v. Skylink Technologies (Fed. Cir.);
- Semtek International Inc. v. Lockheed Martin Corp. (Fed. Cir.); and
- Hilton International Co. v. Union de Trabajadores (1st Cir.).
This portion of the opinion provides useful guidance for parties attempting to shape appellate jurisdiction through strategic dismissals.
Practical Implications
Several practical implications emerge from the decision.
1. Companies Must Investigate Aggressively
The Federal Circuit clearly expects companies to act quickly once they observe:
- suspicious hiring patterns;
- competitor products with significant similarity;
- trade show disclosures; or
- other signs suggesting potential misuse of confidential information.
Waiting for direct evidence may now be dangerous.
2. Internal Emails Matter
The opinion repeatedly cited internal Insulet communications describing EOFlow’s device as a “clone.” Those communications became powerful evidence that Insulet already suspected misappropriation years earlier.
Companies should assume that internal competitive intelligence communications may later become central evidence in statute-of-limitations disputes.
3. Trade Secret Grouping May Compress Filing Windows
The court’s adoption of a broad continuing-misappropriation theory means plaintiffs may not receive separate accrual dates for related trade secrets.
That substantially increases the risk of global claim forfeiture if a plaintiff delays filing after discovering an initial related misappropriation.
4. Public Disclosures Can Trigger Accrual
The Federal Circuit treated trade show displays, publicly available prospectuses, and visible product features as highly relevant evidence regarding discoverability.
Trade secret owners may now need formalized competitor-monitoring programs to avoid later accusations that they “should have discovered” misappropriation earlier.
Final Thoughts
The Federal Circuit’s decision in Insulet v. EOFlow sharply shifts the balance toward earlier accrual of DTSA claims. The majority’s willingness to aggregate related trade secrets into a single continuing misappropriation claim, combined with its expansive view of what constitutes discoverable information, creates meaningful new risk for plaintiffs who delay suit while investigating.
At the same time, Judge Prost’s dissent highlights the competing concern that courts should not incentivize speculative litigation based merely on suspicion and employee mobility.
Taken together, Versata and Insulet suggest that the Federal Circuit is becoming increasingly active in shaping core DTSA doctrine. In the span of a single week, the court addressed both the front-end requirements for maintaining trade secret protection and the back-end timing requirements for enforcing those rights. Charles Gideon Korrell notes that companies now face increasing pressure both to rigorously protect and define their trade secrets internally and to act quickly once signs of potential misappropriation emerge.







