American Pipe Tolling Ends When a Putative Class Is Kept “On Inactive Life Support” Without Pursuing Certification

1. Introduction

This appeal arises from the sprawling GranuFlo/NaturaLyte multidistrict litigation (“MDL”) involving dialysis concentrates manufactured and distributed by Fresenius. After Fresenius issued a March 29, 2012 memorandum warning of cardiopulmonary arrest risks associated with GranuFlo, waves of personal injury and wrongful death suits followed.

The plaintiffs here—MSP Recovery Claims, Series LLC; MSPA Claims 1, LLC; and Series PMPI (collectively “MSP”)—are assignees of recovery rights allegedly held by Medicare/Medicaid-related payers that paid for medical care connected to GranuFlo-related injuries. MSP filed its suit in September 2018, long after the three- or four-year limitations periods that all parties agreed began running on March 29, 2012.

MSP sought to avoid dismissal by invoking class-action tolling under American Pipe & Construction Co. v. Utah, arguing that an earlier putative class action—Berzas v. Fresenius Med. Care Holdings, Inc. (the “Berzas action”), filed March 21, 2013—tolled limitations for putative class members until the Berzas case closed in April 2019. The key issue before the First Circuit was not whether American Pipe exists in the abstract, but when tolling ends—particularly in an MDL setting where class allegations were not actively pursued and appeared to be retained mainly to delay limitations for others.

2. Summary of the Opinion

The First Circuit affirmed dismissal on timeliness grounds, holding that MSP failed to carry its burden to show continued entitlement to American Pipe tolling. Even assuming the Berzas matter could be viewed as nominally retaining class “character” after MDL master/short-form pleading changes, tolling could not extend beyond the point when counsel effectively disavowed any intent to seek class certification and kept class allegations only as a device for “equitable tolling.”

The court concluded that keeping a putative class action “on inactive life support” solely to toll limitations is incompatible with Rule 23’s structure and the efficiency rationales underlying American Pipe. As a result, MSP’s 2018 filing remained untimely for claims accruing in 2012.

3. Analysis

3.1 Precedents Cited

• American Pipe & Construction Co. v. Utah, 414 U.S. 538 (1974)
  The foundational rule: “the commencement of a class action suspends the applicable statute of limitations as to all asserted members of the class who would have been parties had the suit been permitted to continue as a class action.” The First Circuit emphasized that American Pipe is driven by Rule 23’s litigation-efficiency purpose—preventing a “needless multiplicity” of protective filings.
• Crown, Cork & Seal Co. v. Parker, 462 U.S. 345 (1983)
  Reinforced that tolling avoids inducing putative members to file separate actions to protect their rights. The First Circuit used Crown, Cork & Seal to frame the inquiry around incentives and judicial economy rather than individualized reliance.
• Cal. Pub. Emps. Ret. Sys. v. ANZ Sec., Inc., 582 U.S. 497 (2017)
  Characterized American Pipe tolling as grounded in “traditional equitable powers,” though not necessarily applying formal equitable tolling criteria. The First Circuit relied on this “equitable” characterization to justify refusing tolling where the putative class mechanism was being used strategically to extend limitations without pursuing certification.
• China Agritech v. Resh, 584 U.S. 732 (2018)
  Provided the opinion’s central policy vocabulary: the “watchwords” of American Pipe are “efficiency and economy of litigation.” The First Circuit analogized MSP’s position to the kinds of abuses China Agritech warned against—procedural strategies that risk “limitless” extension of time and undermine Rule 23’s intended operation.
• Basch v. Ground Round, Inc., 139 F.3d 6 (1st Cir. 1998)
  First Circuit authority cautioning against stretching limitations by “bringing successive class actions.” While MSP’s case did not involve a successive class action, the court used Basch to reinforce an anti-abuse principle: tolling doctrine should not become a tool to extend statutory periods beyond Rule 23’s aims.
• Collins v. Vill. of Palatine, 875 F.3d 839 (7th Cir. 2017) and United Airlines, Inc. v. McDonald, 432 U.S. 385 (1977)
  Quoted for the proposition that tolling continues only until a case is “stripped of its character as a class action.” The First Circuit used these cases to frame tolling’s endpoint as a functional inquiry—focused on when the litigation ceases to operate as a bona fide class proceeding.
• Bridges v. Dep't of Md. State Police, 441 F.3d 197 (4th Cir. 2006)
  Important to the court’s endpoint analysis: even where a court denies certification “only for administrative purposes,” tolling can end because Rule 23 requires prompt certification decisions and tolling should not enable “perpetual” extension. The First Circuit also quoted Bridges for the warning that avoiding abuse depends on courts fulfilling Rule 23 obligations.
• Gelboim v. Bank of Am. Corp., 574 U.S. 405 (2015) and Connectu LLC v. Zuckerberg, 522 F.3d 82 (1st Cir. 2008)
  These informed the MDL pleading discussion: master complaints may “supersede prior individual pleadings,” and amended complaints “normally supersede” earlier complaints. The First Circuit viewed these authorities as making it appear the Berzas class allegations were dropped when MDL master/short-form pleadings replaced the original class complaint—though it ultimately did not rest its holding solely on that ground.
• Wilkins v. Genzyme Corp., 93 F.4th 33 (1st Cir. 2024)
  Cited for the choice-of-law caution: where claims are “purely under state law,” a court must look to state tolling rules to decide whether American Pipe applies. The First Circuit flagged this as a threshold complication but declined to resolve it because the parties did not press it.
• Martin v. Somerset Cnty., 86 F.4th 938 (1st Cir. 2023)
  Supplied the burden rule: the plaintiff bears the burden of establishing entitlement to American Pipe tolling—dispositive here once the court determined the Berzas “class” component was not being pursued.
• Rife v. One West Bank, F.S.B., 873 F.3d 17 (1st Cir. 2017) (per curiam) and Santana-Castro v. Toledo-Dávila, 579 F.3d 109 (1st Cir. 2009)
  Standard-of-review citations supporting de novo review of statute-of-limitations dismissals.
• Glater v. Eli Lilly & Co., 712 F.2d 735 (1st Cir. 1983) and In re WorldCom Sec. Litig., 496 F.3d 245 (2d Cir. 2007)
  Not used as grounds for decision but noted in a footnote about whether plaintiffs can benefit from tolling while separately filing individual suits before certification is resolved—highlighting a background doctrinal tension left unaddressed in this case.
• MSP Recovery Claims Series LLC v. Fresenius Med. Care Holdings, Inc. (In re Fresenius GranuFlo/Nautralyte Dialysate Prods. Liab. Litig.), 690 F. Supp. 3d 1 (D. Mass. 2023)
  The district court decision affirmed. The First Circuit affirmed on the district court’s second independent ground (tolling ended when class allegations were abandoned), and did not reach the district court’s separate “class membership” rationale.

3.2 Legal Reasoning

(a) The court narrowed the appeal to the tolling-endpoint question.
The district court had two independent reasons to dismiss: (1) MSP’s claims allegedly did not match the Berzas class’s purchase/reimbursement theory; and (2) even if tolling once applied, MSP waited too long after Berzas abandoned class allegations. The First Circuit affirmed solely on the second ground, treating it as sufficient and thus avoiding the class-membership dispute.

(b) The opinion treated MDL pleading mechanics as highly suggestive—but not ultimately determinative.
Fresenius argued the Berzas case ceased being a class action by June 27, 2014 because: (1) the MDL process required adoption of a Master Complaint and filing of Short Form Complaints that “replace[d]” earlier pleadings; and (2) neither the Master Complaint nor the Short Form Complaints asserted class claims. Relying on Gelboim v. Bank of Am. Corp. and Connectu LLC v. Zuckerberg, the court acknowledged that, “on the face of the pleadings,” this would ordinarily mean the class allegations were superseded.

But the court also recognized an MDL reality: in 2015, counsel and the MDL court appeared to treat Berzas as still “hanging out there” as a class action. Given that complexity and confusion, the First Circuit declined to definitively rule that class status unambiguously ended in mid-2014.

(c) Even granting MSP maximum benefit of ambiguity, tolling cannot continue once certification is not being pursued.
The court assumed arguendo that Berzas retained some residual class “character” after 2014. It then asked the functional, policy-laden question implicit in American Pipe and Crown, Cork & Seal: What behavior would Rule 23 and class-action tolling doctrine want to encourage from absent class members observing the putative class action?

In April 2015, MDL plaintiffs’ counsel stated that leadership counsel was “not planning on moving for certification” and that the preference was to leave class cases in place mainly for “equitable tolling.” The First Circuit held that such an “inactive life support” strategy is antithetical to:

• Rule 23’s timing command: certification must be addressed “[a]t an early practicable time,” Fed. R. Civ. P. 23(c)(1)(A).
• American Pipe’s efficiency logic: tolling exists to prevent wasteful protective filings, not to enable indefinite dormancy while preserving claims.
• Anti-abuse principles reflected in China Agritech v. Resh, Basch v. Ground Round, Inc., and Bridges v. Dep't of Md. State Police.

Put differently, tolling is a byproduct of a functioning class process; it is not an entitlement that can be banked by keeping a nominal class caption alive while abandoning the certification effort that gives the device its legitimacy.

(d) Burden of proof sealed the outcome.
Under Martin v. Somerset Cnty., MSP had to establish its entitlement to tolling. The best evidence MSP offered to show Berzas remained a class action after the master/short-form transition also showed “at best” that there was no intent to move for certification. That evidentiary posture could not carry MSP’s burden; therefore, tolling could not extend beyond April 2015, making MSP’s 2018 filing untimely for 2012-accrued claims.

3.3 Impact

• Constrains “parking” putative class actions in MDLs.
  The decision warns MDL practitioners that leaving nominal class allegations pending—without pursuing certification—will not reliably toll limitations for later individual (or assigned) claims. Courts are encouraged to look past docket labels to the functional reality: is class certification being pursued in a manner consistent with Rule 23?
• Reinforces a functional endpoint for tolling.
  Even if a case is not formally dismissed, tolling can end when the class component is effectively abandoned or rendered non-operative. The First Circuit’s analysis tracks the “stripped of its character as a class action” framing drawn from Collins v. Vill. of Palatine and United Airlines, Inc. v. McDonald, but applies it to a modern MDL tactic: maintaining class allegations only to prolong limitations.
• Raises strategic stakes for absent class members and assignees.
  Entities like MSP that acquire claims via assignment cannot assume that the mere historical existence of a putative class action preserves claims for years after certification is effectively off the table. If the certification effort goes dormant, absent members (and those who later stand in their shoes) may need to file protective actions sooner than they would if certification were actively litigated.
• Leaves open state-law tolling complexities.
  The court flagged (via Wilkins v. Genzyme Corp.) that state-law claims may require state-law tolling analysis rather than a direct importation of federal American Pipe. Because the parties did not litigate that issue, the opinion’s main contribution is the federal doctrine’s policy boundary—but future litigants should expect more frequent, more granular choice-of-law fights over tolling.

4. Complex Concepts Simplified

• What is “American Pipe tolling”?
  A rule that pauses (tolls) the statute of limitations for people who fall within a proposed class while the court decides whether the case can proceed as a class action—so they do not have to file their own lawsuits just to preserve their rights.
• When does that tolling stop?
  It stops when the case is no longer being pursued as a class action in any meaningful way—commonly when class certification is denied. This opinion adds that tolling also cannot persist when class certification is effectively abandoned and the class label is maintained only as a tolling tactic.
• What is an MDL “Master Complaint” and “Short Form Complaint”?
  In an MDL, courts sometimes use a “Master Complaint” as a centralized pleading and require each plaintiff to file a “Short Form Complaint” selecting which counts apply to them. Typically, the newer pleadings replace earlier ones; here, that mattered because the replacement pleadings did not include class allegations.
• Why does Rule 23 timing matter?
  Fed. R. Civ. P. 23(c)(1)(A) requires courts to address certification “[a]t an early practicable time.” If parties could keep class allegations dormant indefinitely, tolling could become perpetual, undermining both Rule 23 and statutes of limitation.

5. Conclusion

The First Circuit’s decision establishes a clear anti-abuse boundary for class-action tolling: American Pipe tolling is tethered to the existence of a bona fide, functioning effort to litigate class certification consistent with Rule 23’s design. Where a putative class action is effectively abandoned—especially where counsel disavows any intent to seek certification and keeps the class label only to extend limitations—tolling cannot continue.

For future MDL and mass-tort litigation, the opinion signals that courts will look past procedural ambiguity and docket inertia to the practical reality of whether class proceedings are being actively pursued. Plaintiffs and claim-assignees relying on tolling must monitor the certification posture closely; once a class case is effectively placed in indefinite abeyance, the limitations clock is likely to start running again.