$LNTH

$100.15 +$0.23 (0.23%) Close

$LNTH Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 65.3M shares outstanding

Who owns LNTH?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 58.7%

BlackRock, Inc. 12.9% · Farallon Capital Management, L.L.C. 8.6%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

467

+58 vs last qtr

Net shares bought

+1.4M

by institutions in Q2 2026

New / sold out

95 / 37

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Jupiter Topco LLC NEW +5.2M
Citadel Advisors LLC +1.1M

Biggest sellers in Q2 2026

Janus Henderson Group PLC SOLD OUT −4.8M
Vestor Capital, LLC −1.1M

Who is planning to sell?

Notices of proposed sale, last 12 months

$2.73M

5 notices from 1 person

Shares covered

45.5K

0.07% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Blanchfield Paul Former officer $2.73M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

+109.6%

+8.57% a year

Each share's claim on the business

−52.3%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$475M vs $301M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years59% 3–5 years11% 1–3 years10% Under 1 year19%

Quarterly turnover

18.0%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting LNTH on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	8.4M	12.87%	+214.4K (+2.6%)	≤2021	0.0%
Shares held by quarter Peak holding8.8M (Q1'25) Change over 8 quarters−139.2K Share of the company12.870% BlackRock, Inc.'s full portfolio →
FC Farallon Capital Management, L.L.C.	5.6M	8.55%	Unchanged	2023	2.9%
Shares held by quarter Peak holding6.7M (Q2'25) Change over 8 quarters+2.6M Share of the company8.550% Farallon Capital Management, L.L.C.'s full portfolio →

BlackRock, Inc.

8.4M

% of company

12.87%

Change vs last qtr

+214.4K (+2.6%)

Held since

≤2021

Farallon Capital Management, L.L.C.

5.6M

% of company

8.55%

Change vs last qtr

Unchanged

Held since

2023

28 more super investors behind a free account

See every manager holding Lantheus Holdings, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting LNTH on Form N-PORT; together they hold 51.0% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Mid-Cap ETF iShares Trust	$247M	2.2M	3.41%	0.20%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$229M	2.1M	3.17%	0.01%	June 30, 2026

iShares Core S&P Mid-Cap ETF

iShares Trust

Position value

$247M

% of company

3.41%

% of the fund

0.20%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$229M

% of company

3.17%

% of the fund

0.01%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Lantheus Holdings, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
HM Heino Mary Anne Insider	629.4K	0.96%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.960% Heino Mary Anne's insider activity →
MB Markison Brian A Insider	232.4K	0.36%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.360% Markison Brian A's insider activity →

Heino Mary Anne

Insider

629.4K

% of company

0.96%

Change vs last qtr

—

Held since

—

Markison Brian A

Insider

232.4K

% of company

0.36%

Change vs last qtr

—

Held since

—

15 more holders behind a free account

See every insider and 5%+ holder of Lantheus Holdings, Inc..

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