[SCHEDULE 13G] Lantheus Holdings, Inc SEC Filing

Rhea-AI Filing Summary

FMR LLC (Fidelity) and Abigail P. Johnson have filed Amendment No. 2 to Schedule 13G on MACOM Technology Solutions Holdings Inc. (NASDAQ: MTSI) for an event dated 30 Jun 2025.

• Beneficial ownership: 5,595,985.16 common shares
• Percent of class: 7.5 %
• Sole voting power: 5,573,712.64 shares
• Sole dispositive power: 5,595,985.16 shares

The shares are held in the ordinary course of business; the Schedule 13G filing confirms the position is passive rather than activist. FMR LLC is classified as a “parent holding company or control person” under Rule 13d-1(b)(1)(ii)(G). No other entity’s interest exceeds 5 % of the outstanding common stock.

Signatures were executed by Richard Bourgelas under power of attorney on 5 Aug 2025. The disclosure signals continued institutional support from Fidelity but does not indicate any intention to influence management or corporate strategy.

Positive

• Institutional support: Fidelity-managed FMR LLC now controls 7.5 % of MTSI, signaling confidence from a large, long-term investor.

Negative

• Limited strategic influence: Filing under Schedule 13G denotes a passive stance, implying no activist catalyst or immediate governance change.

Insights

Portfolio Manager

TL;DR – Fidelity now owns 7.5 % of MTSI in a passive capacity; supportive yet non-activist.

The 13G/A shows FMR’s stake has grown to 5.6 million shares, giving the firm a meaningful but non-controlling position. Passive classification limits the probability of governance interventions, yet Fidelity’s long-term track record often attracts additional institutional interest and can enhance liquidity. From a portfolio standpoint the filing is neutral-to-modestly positive; it affirms ongoing confidence without introducing strategic uncertainty.

Corporate Governance Specialist

TL;DR – Large passive holder, no control intent, limited governance impact.

Because FMR opted for a 13G (not 13D) it attests that the holding is strictly investment-driven. Sole voting and dispositive authority remain with FMR, but below the 10 % threshold the firm holds no enhanced reporting duties. Board dynamics are unlikely to change. Overall governance impact is neutral; however, the presence of a reputable institutional owner can deter volatility and facilitate future capital raises.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

LANTHEUS HLDGS INC

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

516544103

(CUSIP Number)

06/30/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 516544103

1

Names of Reporting Persons

FMR LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 5,218,300.93
6	Shared Voting Power 0.00
7	Sole Dispositive Power 5,223,735.50
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,223,735.50

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

7.5 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP No. 516544103

1

Names of Reporting Persons

Abigail P. Johnson

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 5,223,735.50
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,223,735.50

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

7.5 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: LANTHEUS HLDGS INC
(b)	Address of issuer's principal executive offices: 331 TREBLE COVE ROAD,NORTH BILLERICA,MA,USA,01862
Item 2.
(a)	Name of person filing: FMR LLC
(b)	Address or principal business office or, if none, residence: 245 Summer Street, Boston, Massachusetts 02210
(c)	Citizenship: Not applicable
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: 516544103
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 5223735.50
(b)	Percent of class: 7.5 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Please see the responses to Items 5 and 6 on the cover page.
	(ii) Shared power to vote or to direct the vote: 0.00
	(iii) Sole power to dispose or to direct the disposition of: 5223735.50
	(iv) Shared power to dispose or to direct the disposition of: 0.00
Item 5.	Ownership of 5 Percent or Less of a Class.
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. One or more other persons are known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the COMMON STOCK of LANTHEUS HLDGS INC. No one other person's interest in the COMMON STOCK of LANTHEUS HLDGS INC is more than five percent of the total outstanding COMMON STOCK.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See attached Exhibit 99.
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

FMR LLC

Signature:	Richard Bourgelas
Name/Title:	Duly authorized under Power of Attorney effective as of May 23, 2023, by and on behalf of FMR LLC and its direct and indirect subsidiaries*
Date:	08/05/2025

Abigail P. Johnson

Signature:	Richard Bourgelas
Name/Title:	Duly authorized under Power of Attorney effective as of May 23, 2023, by and on behalf of Abigail P. Johnson*
Date:	08/05/2025

Comments accompanying signature: *This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on August 8, 2023, accession number: 0000315066-23-002397.

Exhibit Information

Please see Exhibit 99 for 13d-1(k) (1) agreement.

FAQ

How many MTSI shares does FMR LLC own according to the latest 13G/A?

FMR LLC reports beneficial ownership of 5,595,985.16 common shares, equal to 7.5 % of outstanding stock.

Is Fidelity’s stake in MACOM Technology Solutions passive or activist?

The filing is on Schedule 13G, confirming the position is held passively with no intent to influence control.

Who signed the Schedule 13G/A for FMR LLC and Abigail P. Johnson?

Both signatures were executed by Richard Bourgelas under a power of attorney dated 23 May 2023.

What is the event date triggering the filing?

The ownership information is reported as of 30 June 2025.

Does any other entity own more than 5 % of MTSI through FMR?

No. The filing states that no single other person holds over 5 % of the class via FMR-managed accounts.