Lantheus CEO to retire; $83,333/mo advisory through Mar 2026

Lantheus Holdings (LNTH) announced CEO transition arrangements.

Rhea-AI Filing Summary

Lantheus Holdings (LNTH) announced CEO transition arrangements. Effective November 6, 2025, the company entered into a Consulting Agreement with CEO Brian Markison and a Retirement and Separation Agreement. Mr. Markison will retire on December 31, 2025 and then serve as an advisor from January 1, 2026 through March 31, 2026, with an option to extend.

Under the Retirement Agreement, the company will continue his base salary through the Retirement Date. Within 60 days of December 31, 2025, he will receive a lump sum equal to his earned annual cash bonus for 2025, if any, based on actual company performance as determined in the ordinary course. Under the Consulting Agreement, he will receive an advisory fee of $83,333 per month. His outstanding equity awards will continue to vest through December 31, 2025 and thereafter follow the retirement features described in the company’s March 21, 2025 proxy statement.

Insights

Corporate governance analyst

Orderly CEO transition with defined short-term advisory role.

Lantheus outlines a planned CEO retirement and a three-month advisory engagement starting January 1, 2026 at $83,333 per month. Salary continues through the December 31, 2025 Retirement Date, and any 2025 bonus is payable within 60 days based on actual performance.

The filing specifies equity treatment: awards vest through the Retirement Date, then follow retirement features previously disclosed. This reduces uncertainty around leadership handoff mechanics without altering capital structure.

Key items are administrative and compensation-related. Actual impact on operations or strategy is not detailed; subsequent filings may provide leadership updates if roles change beyond March 31, 2026.

8-K Event Classification

Item 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers

1 item

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers Governance

Key personnel changes including departures, elections, or appointments of directors and executive officers.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Lantheus (LNTH) disclose about its CEO transition?

The company entered into a Retirement Agreement and a Consulting Agreement for Brian Markison, effective November 6, 2025.

When is Brian Markison retiring from Lantheus (LNTH)?

His Retirement Date is December 31, 2025.

What are the terms of the Lantheus CEO consulting period?

He will serve as an advisor from January 1, 2026 through March 31, 2026, with an option to extend, at $83,333 per month.

How will Lantheus handle the CEO’s 2025 bonus?

Within 60 days of December 31, 2025, he will receive a lump sum equal to his earned 2025 annual cash bonus, if any, based on actual performance.

What happens to the CEO’s equity awards at Lantheus?

They continue to vest through December 31, 2025 and then follow retirement features described in the March 21, 2025 proxy statement.

Are the consulting and retirement agreements publicly accessible?

Copies will be filed as exhibits to Lantheus’s Form 10-K for the year ending December 31, 2025.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 11/12/2025 - 04:30 PM Learn about SEC filing dates

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 6, 2025

LANTHEUS HOLDINGS, INC.

(Exact name of Registrant as Specified in Its Charter)

Delaware		001-36569		35-2318913
(State or Other Jurisdiction of Incorporation)		(Commission File Number)		(IRS Employer Identification No.)

201 Burlington Road South Building
Bedford, Massachusetts		01730
(Address of Principal Executive Offices)		(Zip Code)

Registrant’s Telephone Number, Including Area Code: (978) 671-8001

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common stock, par value $0.01 per share		LNTH		The Nasdaq Global Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

Effective as of November 6, 2025 and in connection with his previously announced retirement, Lantheus Holdings, Inc. (the “Company”) entered into a consulting agreement with Brian Markison, the Company’s Chief Executive Officer (the “Consulting Agreement”), for consulting services that will commence on January 1, 2026, pursuant to which he will serve as an advisor to the Company from January 1, 2026 through March 31, 2026, with the parties having the option to extend the consulting period. Effective as of November 6, 2025, Mr. Markison also entered into a retirement and separation agreement (the “Retirement Agreement”) with the Company. Pursuant to the Retirement Agreement, the Company will continue payment of Mr. Markison’s base salary through December 31, 2025 (the “Retirement Date”) and within 60 days of the Retirement Date will pay him a lump sum amount equal to his earned annual cash bonus in respect of 2025, if any, based on actual Company performance as determined in the ordinary course and consistent with past practice.

Pursuant to the Consulting Agreement, subject to continued compliance with customary restrictive covenants in favor of the Company, Mr. Markinson will receive an advisory fee in an amount equal to $83,333 per month. Pursuant to the Retirement Agreement, his outstanding equity awards will continue to vest through the Retirement Date and, thereafter, will be subject to the retirement features as set forth in each such award, as described in the Company’s definitive proxy statement on Schedule 14A filed with the United States Securities and Exchange Commission on March 21, 2025.

The foregoing description of the terms of the Consulting Agreement and the Retirement Agreement does not purport to be complete and is qualified in its entirety by reference to the text of the Consulting Agreement and the Retirement Agreement, copies of which will be filed as an exhibit to the Company’s Annual Report on Form 10-K for the fiscal year ending December 31, 2025.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

LANTHEUS HOLDINGS, INC.
By:		/s/ Daniel M. Niedzwiecki
Name:		Daniel M. Niedzwiecki
Title:		Chief Administrative Officer and General Counsel

Date: November 12, 2025