Lantheus Class Action Lawsuit: A Comprehensive and Essential Investor Guide [2025]

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LANTHEUS CLASS ACTION LAWSUIT

TIMOTHY L. MILES

(855) TIM-M-LAW (855-846-6529)

(24/7/365)

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Introduction to the Lantheus Class Action Lawsuit

A class action lawsuit has been filed on behalf of all persons and entities who purchased or acquired publicly traded securities of Lantheus Holdings, Inc. (NASDAQ: LNTH) securities between February 26, 2025 and August 5, 2025, inclusive (the “Class Period”). 
 
The lawsuit, Margolis v. Lantheus Holdings, Inc., No. 25-cv-07491 (S.D.N.Y.), charges Lantheus and its executives with violations of the Securities Exchange Act of 1934.
 
Key lawsuit information:
  • Case Caption: Margolis v. Lantheus Holdings, Inc., No. 25-cv-07491 (S.D.N.Y.)
  • Class Period: February 26, 2025 – August 5, 2025
  • Company: Lantheus Holdings, Inc. (NASDAQ: LNTH)
  • Allegations: The lawsuit alleges that the company and its executives violated the Securities Exchange Act of 1934 by making false and/or misleading statements and/or failing to disclose material facts to investors.

Understanding Securities Fraud Class Action Lawsuits

Securities fraud class action lawsuits provide a crucial legal mechanism for investors who have suffered financial losses due to corporate malfeasance. These lawsuits arise when a company or its executives engage in deceptive practices that mislead investors about the company’s financial health or prospects. The goal of such litigation is to:
 
  • Hold the perpetrators accountable for their actions.
  • Secure financial compensation for the affected investors.
 
Securities fraud can involve various deceptive activities, such as:
 
  • Insider trading
  • False or misleading financial statements
  • Misleading disclosures that harm market integrity and investor confidence. 
 

The power of the class action mechanism

In a class action lawsuit, a group of affected investors collectively sues the defendant, who could be a corporation or its executives. This collective approach is particularly powerful in the securities realm because:
 
  • It allows individual investors, who may not have the resources to pursue litigation alone, to band together and seek justice.

 

  • The class action mechanism ensures the legal process is efficient and the interests of all affected investors are represented. 
 

Navigating the legal complexities

Securities fraud class action lawsuits are complex and require plaintiffs to navigate a labyrinth of legal standards and procedural hurdles. 
 
  • A significant challenge for plaintiffs is surviving a motion to dismiss, a common legal maneuver by defendants to have the case thrown out before it reaches trial.

 

  • Understanding the specific details and nuances of a case, like the Lantheus lawsuit, is crucial for all stakeholders involved as it sets the stage for future strategic decisions.
 

Overview of the Lantheus Class Action Lawsuit

The Lantheus class action lawsuit revolves around serious allegations of misleading investors. The claim is that the company provided inaccurate or incomplete information regarding its financial status and operations, causing financial losses to investors once the truth was revealed.
 
If proven, these allegations could result in significant legal and financial consequences for the company. Our firm is prepared to analyze the details of the claims, including:
 
  • The allegations that Lantheus’s disclosures lacked transparency.

 

  • Whether there was a deliberate attempt to mislead investors, which could result in punitive measures.
 

A critical reminder for investors

  • The Lantheus lawsuit serves as a powerful reminder of the risks associated with corporate investments and the vital importance of due diligence.

 

  • This case highlights how transparency and accountability are crucial for maintaining investor trust and confidence in the market. As legal proceedings continue, the findings will underscore the significance of corporate honesty in the financial world.

Allegations in the Lantheus Class Action Lawsuit

  • The Lantheus class action lawsuit alleges that defendants created the false impression that they possessed reliable information pertaining to Lantheus’s projected revenue outlook and anticipated growth while also minimizing risk from competition and pricing dynamics, seasonality, and macroeconomic fluctuations.

 

  • In truth, according to the complaint, Lantheus’s optimistic reports of Pylarify’s sales growth potential and pricing normalization fell short of reality and Lantheus, despite defendants’ claims, did not have an accurate understanding of the pricing and competitive dynamics of Pylarify’s market.

 

  • The Lantheus class action lawsuit further alleges that on May 7, 2025, Lantheus reported its first quarter 2025 results, disclosing that Pylarify sales had decreased year-over-year due to an alleged “temporal competitive disruption.”

 

  • The complaint alleges that defendants further reduced their previous full-year projections due to Pylarify’s shortfall, reducing the “year-over-year range to flat-to-low single-digit percent growth for the full year versus our prior view of low-single-digit to mid-single-digit growth.”

 

  • On this news, the price of Lantheus stock fell more than 23%, according to the complaint.

 

  • Then, on August 6, 2025, the Lantheus class action lawsuit further alleges that Lantheus again announced disappointing results and significantly reduced growth expectations for Pylarify, which had fallen 8.3% year-over-year, and slashed fiscal year 2025 growth projections further.

 

  • On this news, the price of Lantheus stock fell nearly 29%, according to the complaint.


The Lead Plaintiff Process in the Lantheus Class Action Lawsuit

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If you purchased Lantheus  stock and suffered a loss call us for a free case evaluation about a Lantheus  Lawsuit. (855) 846-6529

What the PSLRA means for investors

 
Under the Private Securities Litigation Reform Act of 1995 (PSLRA):
 
  • You can still recover even if you are not the lead plaintiff. An investor’s ability to share in any potential future recovery of the class action lawsuit is not dependent upon serving as lead plaintiff.

 

  • Any investor can seek appointment. Any investor who purchased and suffered losses in Lantheus stock may seek appointment as a lead plaintiff in Lantheus the class action lawsuit.

 

  • Largest financial interest. A lead plaintiff is generally the movant with the greatest financial interest in the relief sought by the class.

 

  • Directing the lawsuit. A lead plaintiff acts on behalf of all other class members in directing the class action lawsuit and can select a law firm of their choice to litigate the case. 


The Lead Plaintiff Deadline in the Lantheus Class Action Lawsuit

Lead plaintiff motions for the Lantheus class action lawsuit must be filed with the court no later than November 10, 2025. When a securities class action is filed:

 

  • Anyone who wants to be the lead plaintiff on behalf of the class must thereafter file a motion to be appointed as lead plaintiff(s) no later than 60 days after the notice was published.


The Benefits of Serving as a Lead Plaintiff in the Lantheus Lawsuit

  • Influencing litigation strategy: As a lead plaintiff, you have a direct voice in key strategic decisions, including the decision to settle or proceed to trial.

 

 

  • Active participation in the case: You will be able to review important court filings, monitor the progress of the case, and discuss litigation strategies with legal counsel.

 

 


The Responsibilities the Lead Plaintiff Will Have in the Lantheus Lawsuit

As a lead plaintiff, you have a fiduciary duty to act in the best interests of the class. This involves a commitment of your time and attention to key aspects of the lawsuit. Your responsibilities will include:
 

 

  • Reviewing legal documents: You will review and provide feedback on important court filings before they are submitted.

 

  • Discussing strategy: You will work directly with lead counsel to discuss litigation strategies and key decisions.

 

  • Potential participation in legal events: This may include attending depositions and hearings, if necessary.

 


The Eligibility Criteria for Lead Plaintiff Appointment in theLantheus Class Action Lawsuit

To be eligible for appointment as the lead plaintiff in the Lantheus Class Action Lawsuit, an investor must meet the following criteria:

  • Securities Acquisition: The investor must have purchased or acquired Lantheus Holdings, Inc. (NASDAQ: LNTH) securities between February 26, 2025 and August 5, 2025,

 

  • Financial Losses: The investor must have suffered financial losses as a direct result of the alleged securities fraud perpetrated by Lantheus and its executives.

 

 

It is crucial to note that both domestic and international investors who meet these criteria are eligible to seek appointment as the lead plaintiff in the class action lawsuit, as courts have consistently recognized the rights of non-U.S. investors in securities class actions.

The Legal Requirements for Prevailing in the Lantheus Lawsuit

The elements listed are the requirements for proving a securities fraud claim, particularly under Rule 10b-5 of the Securities Exchange Act of 1934. A plaintiff must demonstrate each of these elements to recover damages for a financial loss
 
Material misrepresentation or omission
 
  • A false statement or concealment. This element requires the defendant to have made a public statement that was either an “untrue statement of a material fact” or to have failed to disclose a material fact necessary to make the statements not misleading.

 

  • Materiality. A fact is “material” if a reasonable investor would have considered it important when deciding whether to buy or sell a security. This is an objective standard, not based on what a specific individual investor might consider important.
 
Scienter
 
  • Culpable state of mind. Scienter is a Latin term referring to a mental state involving intent or knowledge of wrongdoing.

 

  • Intent to deceive. To meet this requirement, the plaintiff must prove that the defendant acted with an “intent to deceive, manipulate, or defraud”.

 

  • Recklessness. While negligence is not enough, acting with a severely reckless disregard for the truth can also satisfy the scienter requirement. 
 
Connection to a securities transaction
 
  • In connection with the purchase or sale. The fraudulent conduct must have occurred in connection with the purchase or sale of a security. This means the deception was part of a securities transaction.
 
Reliance
 
  • Justifiable dependence on the statement. The plaintiff must show that they relied on the misrepresentation or omission when making their investment decision. Reliance is sometimes called “transaction causation” because it establishes the causal link between the deception and the investor’s decision to enter the transaction.

 

  • “Fraud-on-the-market” theory. For public securities traded on an efficient market, plaintiffs may be able to invoke a legal presumption that they relied on the integrity of the market price, which presumably incorporated the material misstatement. The defendant can attempt to rebut this presumption. 
 
Economic loss
 
  • Tangible financial harm. The plaintiff must demonstrate that they suffered a measurable financial loss. It is not enough to simply show that a misrepresentation was made.

 

  • Out-of-pocket damages. A common measure of loss is the difference between the price the plaintiff paid for the security and its value at the time of purchase, had the truth been known. 
 
Loss causation
 
  • The “what if” scenario. This element establishes the causal link between the fraudulent misstatement or omission and the plaintiff’s economic loss. The Supreme Court case Dura Pharmaceuticals v. Broudo made it clear that a plaintiff cannot simply allege that they paid an artificially inflated price.

 

  • Corrective disclosure. To prove loss causation, a plaintiff often must show that the stock price dropped after the truth became known, thereby linking the fraud to the investor’s actual economic harm. The plaintiff must isolate the portion of the loss attributable to the fraud versus other factors, such as general market downturns or other unrelated business problems.


Steps in the Lantheus Class Action Lawsuit

A securities class action lawsuit involves several stages, from the initial filing to the potential distribution of a settlement: 
  • Filing the Complaint: A lead plaintiff files a lawsuit on behalf of similarly affected shareholders, detailing the allegations against the company.
  • Motion to Dismiss: Defendants typically file a motion to dismiss, arguing the complaint lacks sufficient claims.
  • Discovery: If the motion to dismiss is denied, both parties gather evidence, documents, emails, and witness testimonies. This phase can be extensive.
  • Motion for Class Certification: Plaintiffs request the court to certify the lawsuit as a class action. The court assesses factors like the number of plaintiffs, commonality of claims, typicality of claims, and the adequacy of the proposed class representation.
  • Summary Judgment and Trial: Once the class is certified, the parties may file motions for summary judgment. If the case is not settled, it proceeds to trial, which is rare for securities class actions.
  • Settlement Negotiations and Approval: Most cases are resolved through settlements, negotiated between the parties, often with the help of a mediator. The court must review and grant preliminary approval to ensure the settlement is fair, adequate, and reasonable.
  • Class Notice: If the court grants preliminary approval, notice of the settlement is sent to all class members, often by mail, informing them about the terms and how to file a claim.
  • Final Approval Hearing: The court conducts a final hearing to review any objections and grant final approval of the settlement.
  • Claims Administration and Distribution: A court-appointed claims administrator manages the process of sending notices, processing claims from eligible class members, and distributing the settlement funds. The distribution is typically on a pro-rata basis based on recognized losses. 


Who is Affected by the Lantheus Class Action Lawsuit?

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If you purchased Lantheus stock and suffered a loss call us for a free case evaluation about a Semler Lantheus . (855) 846-6529
This class action lawsuit primarily affects investors who purchased shares of Lantheus Holdings, Inc. (NASDAQ: LNTH) and suffered losses during the Class Period: February 26, 2025 to August 5, 2025
 
If you invested in the company during this specific timeframe, you may be a member of the affected class and potentially eligible for compensation.
 

How to determine if you are eligible

Identifying whether you are part of the affected group is the first step to understanding your rights. Here’s what you need to know:
 
  • The lawsuit is defined by a specific time frame and set of circumstances.
  • We can help you determine your eligibility and guide you on the next steps to take. 

 

Beyond the investors

 
While the lawsuit directly affects investors, its outcome can also impact other parties connected to Lantheus, including:
 
  • Executives and board members
  • Other stakeholders
  • The company’s overall reputation and financial stability
 
Staying informed about the progress of the Lantheus class action lawsuit is important for anyone associated with Lantheus.

What Is the Securities Act of 1934?

The Securities Act of 1934 is a significant piece of legislation that was enacted in the United States to regulate the securities industry.

  • This act was passed in response to the stock market crash of 1929 and the subsequent Great Depression. Its main purpose is to protect investors by ensuring that they have access to accurate and reliable information about securities being offered for public sale.

 

  • The act requires companies to register with the Securities and Exchange Commission (SEC) and disclose relevant financial information to the public.

 

  • It also regulates the activities of brokers, dealers, and exchanges to ensure fair and transparent trading practices.

 

Overall, the Securities Act of 1934 plays a crucial role in promoting investor confidence and maintaining the integrity of the securities market

The Class Period in a Securities Class Action

In a securities class action, such as the Lantheus class action lawsuit:

  • The class period refers to the specific time frame during which the alleged fraudulent activity occurred. It is the period in which the plaintiffs claim to have suffered financial losses due to misrepresentations or omissions made by the defendants.

 

  • The class period is crucial in determining who can be included in the class and seek damages.

 

  • It typically starts when the alleged fraud was first publicly disclosed or when investors should have reasonably become aware of it.

 

  • The class period usually ends when the alleged fraud is revealed to the public or when the plaintiffs file a lawsuit.

 

  • The length of the class period can vary depending on the specific circumstances of each case.

What Damages Am I Entitled To?

In a securities fraud case, the plaintiff’s damages are typically calculated as out-of-pocket losses.

  • These losses are expressed as the difference between:

 

  • the price at which the stock was sold and the price at which the stock would have been sold absent any artificial inflation caused by the defendant’s alleged misrepresentations or omissions.​

Steps to Take to Protect Your Investment

Gathering and Organizing Relevant Evidence

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If you purchased Lantheus stock and suffered a loss call us for a free case evaluation about a Lantheus  Lawsuit. (855) 846-6529
In a securities class action lawsuit like the one against Lantheus, evidence is the cornerstone of building a compelling case. For affected shareholders, gathering and organizing all relevant financial and investment documentation is a crucial first step.
 
 
The evidence will help substantiate claims of corporate misconduct and demonstrate the financial harm you may have suffered.
 
What documents do you need?
 
To prepare for the lawsuit, we recommend that you begin compiling the following records:
 
  • Company documents: Gather all press releases, financial statements (like 10-K and 10-Q reports), and analyst reports related toLantheus that you have.

 

  • Your investment history: Meticulously document your investment history with Lantheus , including:

 

    • Dates of all stock purchases and sales

 

    • The quantities of shares bought or sold

 

    • The prices of each transaction

 

  • Communications: Compile any emails or other communications that shed light on the alleged wrongdoing.

 

  • Brokerage records: Collect all relevant brokerage statements and confirmation slips.
 
How to organize your records
 
Organizing this evidence will make the process smoother for both you and your legal team.
 
 
  • Start a file: Create a comprehensive file of all relevant documents.

 

  • Categorize and date: Organize your documents by type and date. This will help your legal counsel easily retrieve and review information.

 

  • Digital copies: If possible, keep digital copies of all documents in a secure location. 
 
By preparing this documentation, you not only strengthen your individual position but also contribute to the overall strength of the Lantheus class action lawsuit. This demonstrates your commitment to actively participating in the litigation process and helps lay a solid foundation for holding the company accountable. 

Staying Informed: Monitoring Case Developments

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In a securities class action lawsuit, keeping up with case developments is crucial for shareholders. As the Lantheus class action lawsuitc class action lawsuit moves forward, new information can significantly impact the strategy and potential outcomes.
 
Here’s how to stay informed and well-positioned throughout the process:
 

Rely on communication with your legal team

 
Your attorneys will provide regular updates and analysis of the ongoing proceedings. This communication is essential for:
 
  • Understanding the implications of new information, such as court rulings. 
  • Assessing the potential risks and benefits of different courses of action.
  • Making informed decisions, such as whether to accept a settlement offer.
 
By maintaining an open line of communication, you can remain engaged and proactive.
 

Follow news and market developments

 
 
While your legal team will be your primary source of information, following news sources and industry reports can provide a broader context. This can help you:
 
  • Gain insights into market trends related to Lantheus lawsuit.
  • Understand broader regulatory changes that may influence the case.
  • Better anticipate shifts in the legal and financial landscape. 
 

Knowledge is power

 
In securities class actions, staying informed is a key component of successful participation. By following these steps, you can ensure you are ready to protect your interests and adapt your strategy as the Lantheus class action lawsuit progresses. 

.

Rights of Investors

Investors affected by the Lantheus  class action lawsuit possess specific rights that they can exercise. Understanding these rights is vital for anyone considering involvement in the lawsuit.

 

Right to Information

  • Investors have the right to receive accurate and timely updates regarding the Lantheus lawsuit.
  • This includes information on the case’s progress, potential settlements, and any necessary actions they may need to undertake.

 

Right to Participate

  • Affected investors have the right to join the Lantheus class action lawsuit.
  • This allows them to collaborate with other investors in seeking compensation for their losses without the burden of filing individual lawsuits.

 

Right to Legal Representation

  • Investors can seek legal counsel to navigate the complexities of the Lantheus class action lawsuit.
  • Legal professionals can provide guidance and support throughout the process.
  • If you suffered substantial losses and wish to serve as lead plaintiff of the Lantheus class action lawsuit, or just have general questions about you rights as a shareholder, please contact attorney Timothy L. Miles of the Law Offices of Timothy L. Miles, at no cost, by calling 855/846-6529 or via e-mail at tmiles@timmileslaw.com.

Options for Investors

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If you purchased Lantheus stock and suffered a loss call us for a free case evaluation about a Lantheus Lawsuit. (855) 846-6529

Investors facing losses due to the Lantheus  class action lawsuit  have several options available to them. Each option carries its own implications and potential outcomes.

Joining the Class Action

  • One of the most straightforward options for investors is to join the Lantheus class action lawsuit .
  • By doing so, they can collectively pursue compensation for their losses without the need for individual litigation.

 

Filing an Individual Claim

  • In certain situations, investors may opt to file individual claims instead of joining the Lantheus lawsuit.
  • This option may be appropriate for those who believe their losses are significant enough to warrant separate legal action.

 

Seeking Legal Advice

  • Consulting with a legal professional experienced in securities law can provide investors with insights into their best course of action.
  • Legal experts can help assess the merits of individual claims versus joining the class action.

 

 

The Role of Law Firms

  • Law firms play a crucial role in the Lantheus class action lawsuit.
  • They provide the necessary legal experience and representation for investors seeking to recover their losses.

 

Selecting a Law Firm

  • Investors have the option to choose a law firm that practices securities fraud cases.
  • A reputable firm can offer valuable insights and increase the likelihood of a favorable outcome.
  • If you suffered substantial losses and wish to serve as lead plaintiff of the Semler Scientific class action lawsuit, or just have general questions about you rights as a shareholder, please contact attorney Timothy L. Miles of the Law Offices of Timothy L. Miles, at no cost, by calling 855/846-6529 or via e-mail at tmiles@timmileslaw.com.

Frequently Asked Questions About the Lantheus Lawsuit

What initiated the Lantheus class action lawsuit?

The Lantheus lawsuit was initiated by investors alleging that Lantheus provided misleading information regarding its financial health and operations, resulting in financial losses.

How can I join the Lantheus lawsuit?

If you purchased shares during the class period and suffered a loss, then you are automatically a member of the class and do not need to do anything at this point unless you are considering moving for lead plaintiff.

What are the potential benefits of a Lantheus lawsuit?

Class action lawsuits allow individual investors to collectively seek justice and compensation, which might be challenging to pursue individually. They also promote corporate accountability.

How long will the Lantheus class action lawsuit take to resolve?

The duration of class action lawsuits can vary significantly, depending on the complexity of the case, legal strategies, and whether settlements are reached. It could take several months to years.

Contact Timothy L. Miles Today About a Lantheus Class Action Lawsuit

If you suffered substantial losses and wish to serve as lead plaintiff of the Lantheus  class action lawsuit, or just have general questions about you rights as a shareholder, please contact attorney Timothy L. Miles of the Law Offices of Timothy L. Miles, at no cost, by calling 855/846-6529 or via e-mail at tmiles@timmileslaw.com. (24/7/365).

Timothy L. Miles, Esq.
Law Offices of Timothy L. Miles
Tapestry at Brentwood Town Center
300 Centerview Dr. #247
Mailbox #1091
Brentwood,TN 37027
Phone: (855) Tim-MLaw (855-846-6529)
Email: tmiles@timmileslaw.com
Website: www.classactionlawyertn.com

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LANTHEUS CLASS ACTION LAWSUIT

TIMOTHY L. MILES

(855) TIM-M-LAW (855-846-6529)

(24/7/365)