Lantheus Holdings (LNTH) CAO reports 6,158-share grant and 133-share tax withholding

Rhea-AI Filing Summary

Lantheus Holdings, Inc. Chief Accounting Officer Kimberly Brown reported equity compensation and a related tax-withholding transaction in common stock. On March 5, 2026, she acquired 6,158 shares at $0.00 per share as a grant, consisting of 3,079 restricted stock units vesting over three years and 3,079 performance-based PSUs that cliff vest after a three-year performance period, with the final PSU amount ranging from 0% to 200% of target based on results. On the same date, 133 shares were disposed of at $76.31 per share for tax withholding. Following these transactions, she directly owned 13,726 common shares.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Brown Kimberly

Role Chief Accounting Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	6,158	$0.00	--
Tax Withholding	Common Stock	133	$76.31	$10K

Holdings After Transaction: Common Stock — 13,859 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Brown Kimberly

(Last) (First) (Middle)

C/O LANTHEUS HOLDINGS, INC.

201 BURLINGTON ROAD, SOUTH BUILDING

(Street)

BEDFORD MA 01730

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Lantheus Holdings, Inc. [ LNTH ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Accounting Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/05/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/05/2026		A(1)		6,158	A	$0	13,859	D
Common Stock	03/05/2026		F		133	D	$76.31	13,726	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Consists of 3,079 restricted stock units that vest in equal installments over a three-year period and 3,079 Total Shareholder Return performance-based restricted stock units ("PSUs") that cliff vest following a three-year performance period. The amount of PSUs included in this Report reflects the target award; however, the ultimate award size can range from 0% to 200% of the target based on the actual performance achieved at the end of the performance period.

	/s/ Eric M. Green, attorney-in-fact	03/09/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transactions did LNTH executive Kimberly Brown report on March 5, 2026?

Kimberly Brown reported receiving 6,158 shares of Lantheus common stock as an equity grant and disposing of 133 shares to satisfy tax withholding. Both transactions involved directly held common stock and occurred on March 5, 2026, according to the Form 4 filing.

How many Lantheus (LNTH) shares did Kimberly Brown acquire and at what price?

She acquired 6,158 shares of Lantheus common stock at $0.00 per share as a grant. The award reflects non-cash equity compensation, split between time-vesting restricted stock units and performance-based PSUs tied to a three-year performance period.

Why did Kimberly Brown dispose of 133 LNTH shares and at what price?

She disposed of 133 shares of Lantheus common stock at $76.31 per share to cover tax withholding obligations. The Form 4 identifies this as a tax-withholding disposition rather than an open-market sale, associated with her equity award on March 5, 2026.

What types of stock units are included in Kimberly Brown’s 6,158-share LNTH award?

The 6,158-share award includes 3,079 restricted stock units that vest in equal installments over three years and 3,079 performance-based PSUs. The PSU portion cliff vests after a three-year performance period, with the actual shares earned ranging from 0% to 200% of target.

How many Lantheus (LNTH) shares does Kimberly Brown own after these transactions?

After the March 5, 2026 transactions, Kimberly Brown directly owned 13,726 shares of Lantheus common stock. This reflects the net effect of the 6,158-share equity grant and the 133-share tax-withholding disposition reported on the Form 4.

How is the performance-based portion of Kimberly Brown’s LNTH PSUs determined?

The performance-based PSUs have a three-year performance period, with final payout based on actual performance. The award can range from 0% to 200% of the 3,079-share target amount, with all PSUs vesting at the end of that three-year period if performance goals are met.