Lantheus Holdings, Inc.
Lantheus Holdings, Inc. (LNTH) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · LNTH · as of Sep 30, 2025
Ownership Breakdown
437
Institutional Holders
▼ 69 vs Q2
$3.66B
Total Inst. Value
▼ $2.98B vs Q2
65.11M
Shares Outstanding
freeFloat 89.65%
71.70M
13F Shares Held
▼ 9.83M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
LNTH largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. in vitro & in vivo diagnostic substances | 8.27M | 12.06% | 12.06% | $423.95B | Nov 12, 2025 | ▼ 267.7K |
VANGUARD GROUP INC in vitro & in vivo diagnostic substances | 6.95M | 10.15% | 10.15% | $356.59B | Nov 7, 2025 | ▲ 115.3K |
JANUS HENDERSON GROUP PLC in vitro & in vivo diagnostic substances | 6.68M | 9.76% | 9.76% | $342.86B | Nov 14, 2025 | ▼ 254.2K |
FMR LLC in vitro & in vivo diagnostic substances | 4.20M | 6.13% | 6.13% | $215.37B | Nov 13, 2025 | ▼ 820.1K |
MORGAN STANLEY in vitro & in vivo diagnostic substances | 3.88M | 5.66% | 5.66% | $198.91B | May 27, 2026 | ▲ 3.14M |
FARALLON CAPITAL MANAGEMENT LLC in vitro & in vivo diagnostic substances | 3.48M | 5.08% | 5.08% | $178.35B | Feb 17, 2026 | ▼ 3.25M |
STATE STREET CORP in vitro & in vivo diagnostic substances | 2.50M | 3.64% | 3.64% | $128.07B | Nov 14, 2025 | ▼ 61.6K |
GEODE CAPITAL MANAGEMENT, LLC in vitro & in vivo diagnostic substances | 1.75M | 2.56% | 2.56% | $90.00B | Nov 12, 2025 | ▼ 22.4K |
DIMENSIONAL FUND ADVISORS LP in vitro & in vivo diagnostic substances | 1.37M | 2.00% | 2.00% | $70.32B | Nov 12, 2025 | ▼ 12.0K |
REINHART PARTNERS, INC. in vitro & in vivo diagnostic substances | 1.35M | 1.97% | 1.97% | $69.13B | Oct 28, 2025 | ▼ 55.9K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
22
Increased
+7.43M shares2
New Positions
first time holders24
Decreased
−8.62M shares0
Sold Out
fully exitedNet shares change (top 50)
1.19M
+7.43M / −8.62M
Net new holders
+0
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
LNTH insider trading · insider activity
Source: SEC Form 4
4
Buy transactions
4
Sell transactions
1.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
McHugh Julie director | May 14, 2026 | Award | 4,137 | — | — | 30.1K | Form 4 ↗ |
Morrow Phuong Khanh director | May 14, 2026 | Award | 4,137 | — | — | 7.2K | Form 4 ↗ |
Maeusli Heinz Christoph director | May 14, 2026 | Award | 4,137 | — | — | 30.0K | Form 4 ↗ |
LENO SAM R director | May 14, 2026 | Award | 4,137 | — | — | 67.2K | Form 4 ↗ |
Pruden Gary J director | May 14, 2026 | Award | 4,137 | — | — | 6.7K | Form 4 ↗ |
Baylor-Henry Minnie director | May 14, 2026 | Award | 4,137 | — | — | 14.0K | Form 4 ↗ |
Ber Gerard director | May 14, 2026 | Award | 4,137 | — | — | 27.5K | Form 4 ↗ |
Thrall James H director | May 14, 2026 | Award | 4,137 | — | — | 39.9K | Form 4 ↗ |
EASTLAND JULIA MARIE director | May 14, 2026 | Award | 4,137 | — | — | 8.0K | Form 4 ↗ |
Niedzwiecki Daniel See Remarks | Apr 17, 2026 | Tax Withhold | 1,911 | $83.82 | $160.2K | 117.5K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Lantheus Holdings, Inc. (LNTH) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 10.35%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Lantheus Holdings, Inc. is BLACKROCK, INC., holding approximately 8.27 million shares — equal to 12.06% of outstanding shares — as of September 30, 2025.
A total of 437 institutional investors currently hold LNTH stock, with a combined institutional value of approximately $3.66 billion as of the most recent 13F filing period.
Frequently asked questions
LNTH ownershipLantheus Holdings, Inc. (LNTH) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is BLACKROCK, INC. with a 12.06% stake. Company insiders hold 10.35%. Data sourced from SEC Form 13F as of September 30, 2025.