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Lantheus Holdings, Inc.

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Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Lantheus Holdings, Inc.

CIK 0001521036LNTH· quarter ending 2026-06-30
Shares outstanding
65,272,369
as of 2026-08-03 · 10-Q cover page, filed 2026-08-06
Held by 13F filers
250,056
selection includes debt or preferreds — no % of shares outstanding
Holders
2
+0 vs 2026-03-31 · 0 new, 0 exited
Value
$908K
shares -81.5% vs prior quarter
13F holdings exceed the share count. This is normal for heavily shorted stocks: shares lent to short sellers are reported by the lender and again by whoever bought them. Related filers occasionally report the same position twice as well.

Share classes (cover page of the 10-Q filed 2026-08-06, as of 2026-08-03)

ClassListedShares outstandingHeld by 13F filers% of classHoldersCUSIP
Common stockLNTH · NASDAQ65,272,36976,034,811116.5%467516544103

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine
CountCUSIPClass (as filers write it)HoldersShares heldClass shares% of classValueOptionsMapped via
516544103Stock46776,034,81165,272,369116.5%$8.4B7 call / 4 put13DGholders →
516544AB9NOTE 2.625%12/1not common7035,367,825
$519.0M principal
——$805.4M—NPORTholders →
46489V104COMnot common2250,056——$908K—13DGholders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings.

Top holders (2 of 2 · 46489V104)

change vs 2026-03-31
#FilerShares / principal% of classValueChange
1PORTLAND INVESTMENT COUNSEL INC.250,000—$853K—
2VESTOR CAPITAL, LLC56—$55K-1,098,635 (-100.0%)

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting personFormFiledEventShares% of class
Gehani, Varun N.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Farallon Healthcare Partners Master, L.P.SCHEDULE 13G/A2026-08-132026-06-3000%
Dreyfuss, Philip D.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Dunn Hannah E.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Farallon Capital (AM) Investors, L.P.SCHEDULE 13G/A2026-08-132026-06-3000%
Farallon Capital F5 Master I, L.P.SCHEDULE 13G/A2026-08-132026-06-3000%
Farallon Capital Institutional Partners III, L.P.SCHEDULE 13G/A2026-08-132026-06-3000%
Farallon Capital Institutional Partners II, L.P.SCHEDULE 13G/A2026-08-132026-06-3000%
Farallon Capital Institutional Partners, L.P.SCHEDULE 13G/A2026-08-132026-06-3000%
Farallon Capital Management, L.L.C.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Farallon Capital Offshore Investors II, L.P.SCHEDULE 13G/A2026-08-132026-06-3000%
Farallon Capital Partners, L.P.SCHEDULE 13G/A2026-08-132026-06-3000%
Farallon F5 (GP), L.L.C.SCHEDULE 13G/A2026-08-132026-06-3000%
Farallon Healthcare Partners (GP), L.L.C.SCHEDULE 13G/A2026-08-132026-06-3000%
Wehrly, Mark C.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Farallon Institutional (GP) V, L.L.C.SCHEDULE 13G/A2026-08-132026-06-3000%
Farallon Partners, L.L.C.SCHEDULE 13G/A2026-08-132026-06-3000%
Warren, John R.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Dapice Joshua J.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Four Crossings Institutional Partners V, L.P.SCHEDULE 13G/A2026-08-132026-06-3000%
Linn, Michael G.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Giauque, NicolasSCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Husen, Avner A.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Spokes, Andrew J. M.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Kim, David T.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Short Daniel S.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Luo Patrick (Cheng)SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Saito Edric C.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Roberts, Jr., Thomas G.SCHEDULE 13G/A2026-08-132026-06-305,583,4798.6%
Vanguard Portfolio ManagementSCHEDULE 13G2026-07-312026-06-303,300,2935.06%
JANUS HENDERSON GROUP PLCSCHEDULE 13G/A2026-05-152026-03-314,774,8417.4%
Vanguard Capital ManagementSCHEDULE 13G2026-04-302026-03-313,421,4145.25%
The Vanguard GroupSCHEDULE 13G/A2026-03-272026-03-1300%
Morgan Stanley Capital Services LLCSCHEDULE 13G/A2026-02-122025-12-31936,8991.4%
Morgan StanleySCHEDULE 13G/A2026-02-122025-12-311,640,8372.5%
Patel, Rajiv A.SCHEDULE 13G/A2026-02-052025-12-3100%
Seybold, WilliamSCHEDULE 13G/A2026-02-052025-12-3100%
Fried, Richard BSCHEDULE 13G/A2026-02-052025-12-3100%
Abigail P. JohnsonSCHEDULE 13G/A2025-11-052025-09-304,399,523.576.5%
FMR LLCSCHEDULE 13G/A2025-11-052025-09-304,399,523.576.5%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.