By Thomas Przybylowski, Securities Litigation Attorney
At a Glance
- The PSLRA’s automatic discovery stay halts nearly all discovery while a motion to dismiss is pending, making the pleadings — not discovery — the decisive stage in securities fraud litigation.
- The stay isn’t purely defense-friendly: it also blocks plaintiffs from getting the internal documents defendants often claim are missing from the complaint, and it has a narrow exception for particularized discovery to preserve evidence or prevent undue prejudice.
- Plaintiffs must do their investigative work before filing; defendants should treat the motion to dismiss as their primary battleground, not a preliminary skirmish.
- Whether the stay applies to Securities Act claims filed in state court remains a genuine, unresolved split, making forum selection a strategic decision with real procedural consequences.
In most civil litigation, the case is built during discovery. In securities fraud litigation, the case is often decided before discovery begins at all.
That inversion is the direct result of the Private Securities Litigation Reform Act, and specifically its automatic stay of discovery. More than almost any other feature of securities practice, the stay shapes how these cases are litigated, why the motion to dismiss carries so much weight, and where the leverage sits at each stage. Whether you represent investors or defendants, you cannot litigate these cases effectively without understanding how the stay works and how it drives strategy.
Here is how I think about it, drawing on experience litigating securities cases from both sides of the docket.
What the Stay Actually Does
Congress enacted the PSLRA in 1995 to curb what it viewed as abusive securities litigation, including suits filed primarily to leverage the cost and burden of discovery into a settlement regardless of the merits. The mechanism it chose is straightforward in its text. Under 15 U.S.C. § 78u-4(b)(3)(B), all discovery and other proceedings are stayed during the pendency of a motion to dismiss, unless the court finds on a party’s motion that particularized discovery is necessary to preserve evidence or to prevent undue prejudice.
The consequence is significant. In ordinary litigation, a plaintiff who survives the pleadings can use discovery to develop the facts and fill in gaps. In a securities case, the plaintiff must plead a viable claim before obtaining any discovery at all, which means the complaint has to stand on facts the plaintiff can assemble without the defendant’s documents. Combined with the heightened pleading standards of Rule 9(b) and the PSLRA itself, the stay raises the bar at the pleading stage and makes the motion to dismiss the central battleground of the entire case.
The Stay Cuts Both Ways
It is easy to describe the discovery stay as a defense-side protection, and in many cases it functions that way. But the reality on the ground is more nuanced, and litigators on both sides should resist treating it as a tool that benefits only one party.
Consider a recurring dynamic. Defendants moving to dismiss a securities complaint frequently argue that the plaintiff has failed to plead particularized facts, including the kind of internal documents or contemporaneous reports that would show what management actually knew and when. At the same time, the discovery stay is precisely what prevents the plaintiff from obtaining those documents at the pleading stage. There is a real tension there, and courts are aware of it.
The stay is also not absolute even in federal court. The statute itself contains an exception for particularized discovery needed to preserve evidence or prevent undue prejudice, and in the right circumstances that exception has teeth. I have seen situations where a targeted motion to lift the stay, for example to depose a witness with direct knowledge of the conduct at issue before that testimony becomes unavailable, is both appropriate and successful.
The stay is the default, not an impenetrable wall, and good plaintiffs’ counsel know when an exception is worth pursuing. The “internal documents” at issue are increasingly the everyday kind — texts, Slack messages, and other electronic communications that were never written with litigation in mind. For more on how those communications become discoverable, see Think Your Text Messages Are Private? A Lawsuit May Prove Otherwise.
How the Stay Shapes Strategy on Each Side
For plaintiffs, the stay means the investigation has to happen before the complaint is filed, not after. That is why serious plaintiffs’ firms invest heavily in pre-filing work: analyzing public disclosures, reviewing analyst coverage and trading data, and developing witness accounts from former employees who can speak to what was happening inside the company. The complaint that survives is almost always the one that was built on a thorough factual foundation assembled without the benefit of discovery, because the stay guarantees there is no second chance to develop those facts before the motion to dismiss is decided. AI-assisted document review is also changing how quickly that pre-filing work can be done; for more, see How AI Is Changing the Game in Modern Litigation.
For defendants, the stay creates a clear strategic priority: win at the pleading stage, where the plaintiff is at the greatest informational disadvantage and where the cost and disruption of discovery have not yet entered the picture. A strong motion to dismiss does more than test the complaint. It holds the line at the one moment in the case where the asymmetry most favors the defense. That is also why defendants treat the motion to dismiss as the place to invest their best work rather than as a preliminary skirmish before the real fight.
The Unsettled State-Court Question
There is an important wrinkle that has generated years of litigation, and it is worth understanding because it directly affects where these cases get filed. The PSLRA stay plainly applies to Securities Act claims brought in federal court. Whether it applies to the same claims brought in state court has been the subject of a genuine and lasting split.
The issue traces back to the Supreme Court’s 2018 decision in Cyan v. Beaver County Employees Retirement Fund, which held that state courts retain jurisdiction over class actions asserting claims under the Securities Act of 1933 and that those actions are not removable to federal court.
After Cyan, plaintiffs increasingly filed 1933 Act claims in state court, in part to pursue them outside the federal procedural framework. That raised a question Cyan did not answer: does the PSLRA’s automatic discovery stay, which by its terms applies in any private action arising under the Securities Act, follow those claims into state court?
State courts have divided sharply on this, sometimes even within the same jurisdiction, which has meant that the answer could turn on which judge a litigant happened to draw. New York’s Appellate Division, First Department, addressed the issue in Camelot Event Driven Fund v. Morgan Stanley, holding that the stay applies to any private action whether brought in state or federal court, while courts in other states have refused to apply it. The Supreme Court once granted certiorari to resolve the question, but the case settled before it could be decided, so the split persists.
For litigants, the practical takeaway is that forum selection in 1933 Act cases is not a formality. Where a case is filed can determine whether discovery is stayed during the motion to dismiss, and that single procedural question can reshape the leverage in the entire litigation.
The Bottom Line
The PSLRA discovery stay is the feature that makes securities litigation different from almost everything else in civil practice. It pushes the decisive moment to the pleading stage, rewards plaintiffs who do the investigative work up front, and gives defendants their strongest opportunity to end a case before it ever reaches discovery. It is not a one-sided tool, and it is not absolute, and the unresolved state-court question adds a layer of strategy that sophisticated litigants ignore at their peril. Understanding the stay is not a technicality. It is the foundation for litigating these cases well.
Frequently Asked Questions
What is the PSLRA discovery stay?
It’s a provision of the Private Securities Litigation Reform Act, codified at 15 U.S.C. § 78u-4(b)(3)(B), that automatically halts discovery and other proceedings while a motion to dismiss is pending in a securities fraud case.
Does the discovery stay apply automatically, or does a defendant have to request it?
It applies automatically once a motion to dismiss is filed — no separate motion or court order is needed to trigger it.
Are there any exceptions to the stay?
Yes. A party can move the court to allow particularized discovery if it’s necessary to preserve evidence or to prevent undue prejudice. Courts grant this sparingly, but it has succeeded in situations like preserving testimony from a witness who may become unavailable.
Does the discovery stay only benefit defendants?
No. While defendants generally benefit from the stay, it also prevents plaintiffs from obtaining internal documents at the pleading stage — even when defendants argue the complaint lacks exactly that kind of detail. Courts are aware of this tension.
Does the PSLRA stay apply to cases filed in state court?
It’s unsettled. Since the Supreme Court’s 2018 decision in Cyan v. Beaver County Employees Retirement Fund allowed Securities Act class actions to proceed in state court, state courts have split on whether the stay follows those claims. New York’s Appellate Division, First Department, held in Camelot Event Driven Fund v. Morgan Stanley that it does; other states have gone the other way. The Supreme Court granted certiorari to resolve the split, but the case settled before a decision issued.
Why does forum selection matter in Securities Act cases?
Because whether a case is filed in state or federal court can determine whether discovery is stayed during the motion to dismiss — a difference that can significantly affect each side’s leverage throughout the litigation.
What should plaintiffs do to prepare for the discovery stay?
Front-load the investigation. Serious plaintiffs’ firms build their factual record before filing — through public disclosures, analyst and trading data, and former-employee witness accounts — since the stay means there’s no second chance to develop facts before the motion to dismiss is decided.
What should defendants prioritize because of the stay?
Treat the motion to dismiss as the central event in the case, not a preliminary step. It’s the point where the informational asymmetry most favors the defense, so it deserves top-tier resources and strategy.
About the author
Thomas Przybylowski is a litigation attorney with extensive experience leading complex commercial litigation, securities fraud and high-stakes disputes. He previously practiced at Pomerantz LLP and Schulte Roth & Zabel LLP and was named a Super Lawyers® Rising Star in 2020 and 2021. You can learn more about Thomas Przybylowski in his recent profile with Canvas Rebels.