What SEC filings does Lantheus Holdings, Inc. submit to the SEC?

Lantheus Holdings, Inc. (LNTH) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about LNTH?

A Form 4 for LNTH discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from Lantheus Holdings, Inc.?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for LNTH?

The 10-K is Lantheus Holdings, Inc.'s annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all LNTH SEC filings directly on EDGAR?

You can view all historical Lantheus Holdings, Inc. filings on the SEC EDGAR company page for LNTH. Each filing card on this page links directly to the original SEC document.

How often does Lantheus Holdings, Inc. file with the SEC?

Lantheus Holdings, Inc. files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling LNTH shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

LNTH SEC Filing News — Lantheus Holdings, Inc.

Latest SEC filings for Lantheus Holdings, Inc. (LNTH) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-10-14.

Lantheus Holdings, Inc. develops, manufactures, and commercializes diagnostic and therapeutic products that assist clinicians in diagnosis and treatment of heart, cancer, and other diseases worldwide. The company offers DEFINITY, an injectable ultrasound enhancing agent used in echocardiography exams; TechneLite, a technetium generator for nuclear medicine procedures; Xenon-133, a radiopharmaceutical gas to assess pulmonary function; Neurolite, an injectable imaging agent to identify the area wi…

Sector: Healthcare Industry: Drug Manufacturers - Specialty & Generic Market Cap: $6.5B CIK: 1521036

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for LNTH currently lean bearish. Of the 20 filing records displayed, 4 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.

LNTH Filing Activity Snapshot 2026-05-18 — 2026-10-14

Insider Transactions (Form 4)

0 buys vs 4 sells

Net insider selling in this period — insiders sell for many reasons beyond conviction.

Largest Form 144 Filing

$776.9K

Lantheus Alpha Therapy, LLC (10% Owner) · 2026-09-08

247,932 shares · Form 4

Insider Transactions 13 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 13 filings in this group are Form 4s for Lantheus Holdings, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 13 insider filings shown, the breakdown is 5 tax withholding, 4 compensation award and 4 open-market sale. 4 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Tax withholding ×5: Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.
Compensation award ×4: Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Open-market sale ×4: The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Form 4 Open-market sale Insider Selling 2026-09-08

LNTH insider Lantheus Alpha Therapy, LLC (10% Owner) sold 247,932 shares (~$776.9K)

Lantheus Alpha Therapy, LLC, listed as 10% Owner at Lantheus Holdings, Inc., reported an open-market sale of 247,932 LNTH shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	80,783	$3.11	$250.9K
`S`	Open-market sale	167,149	$3.15	$526.1K

Filing: Form 4 (Insider Transaction) Insider: Lantheus Alpha Therapy, LLC (10% Owner) Shares: 247,932 Est. Value: $776.9K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-09-04

LNTH insider Lantheus Alpha Therapy, LLC (10% Owner) sold 42,129 shares (~$131.2K)

Lantheus Alpha Therapy, LLC, listed as 10% Owner at Lantheus Holdings, Inc., reported an open-market sale of 42,129 LNTH shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	42,129	$3.11	$131.2K

Filing: Form 4 (Insider Transaction) Insider: Lantheus Alpha Therapy, LLC (10% Owner) Shares: 42,129 Est. Value: $131.2K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-09-03

LNTH insider Lantheus Holdings, Inc. (10% Owner) sold 35,769 shares (~$111.6K)

Lantheus Holdings, Inc., listed as 10% Owner at Lantheus Holdings, Inc., reported an open-market sale of 35,769 LNTH shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	35,769	$3.12	$111.6K

Filing: Form 4 (Insider Transaction) Insider: Lantheus Holdings, Inc. (10% Owner) Shares: 35,769 Est. Value: $111.6K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-09-02

LNTH insider Lantheus Holdings, Inc. (10% Owner) sold 78,145 shares (~$245.6K)

Lantheus Holdings, Inc., listed as 10% Owner at Lantheus Holdings, Inc., reported an open-market sale of 78,145 LNTH shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	78,145	$3.14	$245.6K

Filing: Form 4 (Insider Transaction) Insider: Lantheus Holdings, Inc. (10% Owner) Shares: 78,145 Est. Value: $245.6K

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-09-02

LNTH insider Form 4 filed for equity award, exercise, or tax withholding

Marshall Robert J. Jr. (CFO and Treasurer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	721	$100.96	$72.8K

Filing: Form 4 (Insider Transaction) Insider: Marshall Robert J. Jr. (CFO and Treasurer) Shares: 721

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-08-19

LNTH insider Form 4 filed for equity award, exercise, or tax withholding

Dinkelborg Ludger (See Remarks) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	2,536	$100.91	$255.9K

Filing: Form 4 (Insider Transaction) Insider: Dinkelborg Ludger (See Remarks) Shares: 2,536

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-08-19

LNTH insider Form 4 filed for equity award, exercise, or tax withholding

Brown Kimberly (Chief Accounting Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	463	$100.91	$46.7K

Filing: Form 4 (Insider Transaction) Insider: Brown Kimberly (Chief Accounting Officer) Shares: 463

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-06-03

LNTH insider Form 4 filed for equity award, exercise, or tax withholding

Ber Gerard (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	381	$96.67	$36.8K

Filing: Form 4 (Insider Transaction) Insider: Ber Gerard (Director) Shares: 381

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-06-03

LNTH insider Form 4 filed for equity award, exercise, or tax withholding

Heino Mary Anne (Director, Executive Chair and CEO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	1,227	$96.67	$118.6K

Filing: Form 4 (Insider Transaction) Insider: Heino Mary Anne (Director, Executive Chair and CEO) Shares: 1,227

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-05-18

LNTH insider Form 4 filed for equity award, exercise, or tax withholding

McHugh Julie (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	4,137	—	—

Filing: Form 4 (Insider Transaction) Insider: McHugh Julie (Director) Shares: 4,137

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-05-18

LNTH insider Form 4 filed for equity award, exercise, or tax withholding

Morrow Phuong Khanh (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	4,137	—	—

Filing: Form 4 (Insider Transaction) Insider: Morrow Phuong Khanh (Director) Shares: 4,137

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-05-18

LNTH insider Form 4 filed for equity award, exercise, or tax withholding

Maeusli Heinz Christoph (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	4,137	—	—

Filing: Form 4 (Insider Transaction) Insider: Maeusli Heinz Christoph (Director) Shares: 4,137

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-05-18

LNTH insider Form 4 filed for equity award, exercise, or tax withholding

LENO SAM R (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	4,137	—	—

Filing: Form 4 (Insider Transaction) Insider: LENO SAM R (Director) Shares: 4,137

View on SEC EDGAR → Open Filing Document →

Material Events 6 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 6 in this period for Lantheus Holdings, Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-10-14