Lantheus Holdings, Inc. (LNTH) has 20 known insider and institutional holders on record. The largest holder is FARALLON PARTNERS L L C/CA with 6,842,227 shares. Other notable holders include PATEL RAJIV A and Venkataraman Sriram.
Over the last 12 months, insiders have made 45 transactions in LNTH stock — 13 buys (valued at $4.25M) and 10 sells (valued at $386.26M). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
LNTH Insider Ownership
Top Holder
FARALLON PARTNERS L L C/CA
6,842,227 shares
Buys (12 mo)
13
$4.25M value
Sells (12 mo)
10
$386.26M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Farallon Partners L L C/ca |
10 Percent Owner, Other: Member of A Group Owning 10% |
6,842,227 |
2025-08-21 |
|
| 2 |
Patel Rajiv A |
Other: Member of A Group Owning 10% |
6,842,227 |
2025-08-21 |
|
| 3 |
Venkataraman Sriram |
10 Percent Owner |
1,846,996 |
2017-03-21 |
|
| 4 |
Heino Mary Anne |
Executive Chair and CEO |
323,124 |
2026-03-04 |
|
| 5 |
Bailey Jeffrey Allen |
CEO and President |
229,407 |
2015-09-03 |
|
| 6 |
Crowley John W. |
CFO |
161,825 |
2018-04-27 |
|
| 7 |
Avista Capital Partners Gp, Llc |
10 Percent Owner |
124,186 |
2017-08-16 |
|
| 8 |
Marshall Robert J. Jr. |
CFO and Treasurer |
122,792 |
2026-03-09 |
|
| 9 |
Niedzwiecki Daniel |
See Remarks |
119,376 |
2026-03-09 |
|
| 10 |
Dawes William C. Jr. |
VP, Mfg & Ops |
111,581 |
2017-09-01 |
|
| 11 |
Duffy Michael P |
SVP and General Counsel |
109,472 |
2021-04-20 |
|
| 12 |
Blanchfield Paul |
President |
108,214 |
2025-08-15 |
|
| 13 |
Bolla John J. |
Chief Operations Officer |
102,440 |
2021-06-21 |
|
| 14 |
Montagut Etienne |
Chief Business Officer |
94,651 |
2024-03-07 |
|
| 15 |
Healey Timothy G |
SVP, Commercial |
85,658 |
2018-03-07 |
|
| 16 |
Bakewell John K |
CFO and Treasurer |
83,500 |
2015-10-02 |
|
| 17 |
Orlandi Cesare |
Chief Medical Officer |
68,483 |
2019-05-01 |
|
| 18 |
Walker Carol |
Senior Vice President, Quality |
64,899 |
2022-04-01 |
|
| 19 |
Morgan Amanda Michelle |
Chief Commercial Officer |
64,153 |
2026-03-09 |
|
| 20 |
Sabens Andrea |
Chief Accounting Officer |
62,216 |
2024-07-17 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-05 |
Dinkelborg Ludger |
See Remarks |
RSU Award |
20,966 |
- |
- |
| 2026-03-05 |
Brown Kimberly |
Chief Accounting Officer |
Tax Withholding of RSU |
133 |
$76.31 |
$10.15K |
| 2026-03-05 |
Morgan Amanda Michelle |
Chief Commercial Officer |
Tax Withholding of RSU |
595 |
$76.31 |
$45.4K |
| 2026-03-05 |
Niedzwiecki Daniel |
See Remarks |
Tax Withholding of RSU |
1,283 |
$76.31 |
$97.91K |
| 2026-03-05 |
Marshall Robert J. Jr. |
CFO and Treasurer |
Tax Withholding of RSU |
1,182 |
$76.31 |
$90.2K |
| 2026-03-02 |
Morgan Amanda Michelle |
Chief Commercial Officer |
Tax Withholding of RSU |
3,336 |
$76.30 |
$254.54K |
| 2026-03-02 |
Niedzwiecki Daniel |
See Remarks |
Tax Withholding of RSU |
8,259 |
$76.30 |
$630.16K |
| 2026-03-02 |
Marshall Robert J. Jr. |
CFO and Treasurer |
Tax Withholding of RSU |
10,652 |
$76.30 |
$812.75K |
| 2026-03-02 |
Heino Mary Anne |
Executive Chair and CEO |
Tax Withholding of RSU |
41,916 |
$76.30 |
$3.2M |
| 2025-12-15 |
Morgan Amanda Michelle |
Chief Commercial Officer |
Tax Withholding of RSU |
368 |
$66.57 |
$24.5K |
| 2024-12-15 |
Morgan Amanda Michelle |
Chief Commercial Officer |
Tax Withholding of RSU |
356 |
$93.48 |
$33.28K |
| 2025-11-17 |
Heino Mary Anne |
Executive Chair |
RSU Award |
26,325 |
$52.50 |
$1.38M |
| 2025-08-29 |
Marshall Robert J. Jr. |
CFO and Treasurer |
Tax Withholding of RSU |
727 |
$54.90 |
$39.91K |
| 2025-08-20 |
Patel Rajiv A |
Other: Member of A Group Owning 10% |
Informative Sell |
3,365,000 |
$56.15 |
$188.94M |
| 2025-08-19 |
Patel Rajiv A |
Other: Member of A Group Owning 10% |
Informative Sell |
41,000 |
$55.34 |
$2.27M |
| 2025-08-20 |
Farallon Partners L L C/ca |
10 Percent Owner, Other: Member of A Group Owning 10% |
Informative Sell |
3,365,000 |
$56.15 |
$188.94M |
| 2025-08-19 |
Farallon Partners L L C/ca |
10 Percent Owner, Other: Member of A Group Owning 10% |
Informative Sell |
41,000 |
$55.34 |
$2.27M |
| 2025-08-15 |
Dinkelborg Ludger |
See Remarks |
RSU Award |
14,765 |
- |
- |
| 2025-08-15 |
Brown Kimberly |
Chief Accounting Officer |
Tax Withholding of RSU |
463 |
$54.18 |
$25.09K |
| 2025-08-01 |
Dinkelborg Ludger |
See Remarks |
Unknown |
- |
- |
- |
| 2025-08-06 |
Patel Rajiv A |
Other: Member of A Group Owning 10% |
Unknown |
- |
- |
- |
| 2025-08-06 |
Farallon Partners L L C/ca |
10 Percent Owner, Other: Member of A Group Owning 10% |
Unknown |
- |
- |
- |
| 2025-08-13 |
Blanchfield Paul |
President |
Informative Sell |
3,060 |
$53.57 |
$163.92K |
| 2025-07-15 |
Blanchfield Paul |
President |
Tax Withholding of RSU |
518 |
$81.26 |
$42.09K |
| 2025-06-13 |
Niedzwiecki Daniel |
See Remarks |
Informative Sell |
6,000 |
$78.74 |
$472.44K |
