LNTH

SEC source: 0000899243-17-021317 · doc4.xml · nonDerivative · entry 1

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 582,750

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.15, inclusive. The Reporting Person undertakes to provide to Lantheus Holdings, Inc., any security holder of Lantheus Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (4) and (5) to this Form 4.

F2 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-021112 · doc4.xml · nonDerivative · entry 6

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 97,479

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.075, inclusive.

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-021112 · doc4.xml · nonDerivative · entry 5

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 600,519

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.075, inclusive.

F2 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-021112 · doc4.xml · nonDerivative · entry 4

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 101,514

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.15, inclusive.

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-021112 · doc4.xml · nonDerivative · entry 3

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 625,374

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.15, inclusive.

F2 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-021112 · doc4.xml · nonDerivative · entry 2

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 107,418

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.025, inclusive. The Reporting Person undertakes to provide to Lantheus Holdings, Inc., any security holder of Lantheus Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (4) and (5) to this Form 4. The amounts shown in Column 5 have been revised to correct errors in previously filed reports.

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-021112 · doc4.xml · nonDerivative · entry 1

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 661,746

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.025, inclusive. The Reporting Person undertakes to provide to Lantheus Holdings, Inc., any security holder of Lantheus Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (4) and (5) to this Form 4. The amounts shown in Column 5 have been revised to correct errors in previously filed reports.

F2 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-020545 · doc4.xml · nonDerivative · entry 11

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 122,492

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.20, inclusive.

F4 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Each of ACP GP and ACP Offshore expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-020545 · doc4.xml · nonDerivative · entry 10

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 754,611

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.20, inclusive.

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Each of ACP GP and ACP expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 13

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 122,492

F11 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.20, inclusive.

F4 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 12

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 754,611

F11 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.20, inclusive.

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-020545 · doc4.xml · nonDerivative · entry 9

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 124,186

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.45, inclusive.

F4 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Each of ACP GP and ACP Offshore expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-020545 · doc4.xml · nonDerivative · entry 8

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 765,045

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.45, inclusive.

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Each of ACP GP and ACP expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 11

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 124,186

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.45, inclusive.

F4 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 10

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 765,045

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.45, inclusive.

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-020545 · doc4.xml · nonDerivative · entry 7

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F7 · ownership.nature: Represents shares of the Issuer held by ACP-Lantern Co-Invest, LLC ("ACP Co-Invest"). ACP GP is the manager of ACP Co-Invest. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Co-Invest. Each of ACP GP and ACP Co-Invest expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein. On August 14, 2017, ACP Co-Invest distributed 1,762,208 shares of common stock to one or more members or partners.

SEC source: 0000899243-17-020545 · doc4.xml · nonDerivative · entry 6

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 117,600

F4 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Each of ACP GP and ACP Offshore expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

F6 · ownership.nature: On August 14, 2017, ACP Offshore distributed 815,672 shares of common stock to one or more members or partners.

SEC source: 0000899243-17-020545 · doc4.xml · nonDerivative · entry 5

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 724,471

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Each of ACP GP and ACP expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

F5 · ownership.nature: On August 14, 2017, ACP distributed 2,785,709 shares of common stock to one or more members or partners.

SEC source: 0000899243-17-020545 · doc4.xml · nonDerivative · entry 4

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 933,272

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.00 to $18.18, inclusive.

F4 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Each of ACP GP and ACP Offshore expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-020545 · doc4.xml · nonDerivative · entry 3

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 935,060

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.98, inclusive. The Reporting Person undertakes to provide to Lantheus Holdings, Inc., any security holder of Lantheus Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (2), (8) and (9) to this Form 4.

F4 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Each of ACP GP and ACP Offshore expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-020545 · doc4.xml · nonDerivative · entry 2

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 3,510,180

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.00 to $18.18, inclusive.

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Each of ACP GP and ACP expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-020545 · doc4.xml · nonDerivative · entry 1

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 3,521,192

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.98, inclusive. The Reporting Person undertakes to provide to Lantheus Holdings, Inc., any security holder of Lantheus Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (2), (8) and (9) to this Form 4.

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Each of ACP GP and ACP expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 9

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By trust

Disclosed balance after: 1,562

F8 · shares: The distribution to partners referred to in the foregoing footnotes includes subsequent distributions by general partners to their respective partners, including Mr. Burgstahler.

F9 · ownership.nature: The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 8

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,248

F8 · shares: The distribution to partners referred to in the foregoing footnotes includes subsequent distributions by general partners to their respective partners, including Mr. Burgstahler.

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 7

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F7 · ownership.nature: Represents shares of the Issuer held by ACP-Lantern Co-Invest, LLC ("ACP Co-Invest"). ACP GP is the manager of ACP Co-Invest. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Co-Invest. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein. On August 14, 2017, ACP Co-Invest distributed 1,762,208 shares of common stock to one or more members or partners.

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 6

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 117,600

F4 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein

F6 · ownership.nature: On August 14, 2017, ACP Offshore distributed 815,672 shares of common stock to one or more members or partners.

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 5

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 724,471

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

F5 · ownership.nature: On August 14, 2017, ACP distributed 2,785,709 shares of common stock to one or more members or partners.

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 4

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 933,272

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.00 to $18.18, inclusive.

F4 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 3

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 935,060

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.98, inclusive. The Reporting Person undertakes to provide to Lantheus Holdings, Inc., any security holder of Lantheus Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (2), (10) and (11) to this Form 4.

F4 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 2

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 3,510,180

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.00 to $18.18, inclusive.

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-020544 · doc4.xml · nonDerivative · entry 1

Burgstahler David F · CIK 0001374179 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 3,521,192

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.00 to $17.98, inclusive. The Reporting Person undertakes to provide to Lantheus Holdings, Inc., any security holder of Lantheus Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1), (2), (10) and (11) to this Form 4.

F3 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-019281 · doc4.xml · nonDerivative · entry 1

Orlandi Cesare · CIK 0001610664 · Chief Medical Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 108,323

SEC source: 0000899243-17-018268 · doc4.xml · nonDerivative · entry 1

Heino Mary Anne · CIK 0001610676 · Director · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 592,468

F1 · kind: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 12, 2017.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.00 to $18.20, inclusive. The reporting person undertakes to provide to Lantheus Holdings, Inc., any security holder of Lantheus Holdings, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) to this Form 4.

SEC source: 0000899243-17-016982 · doc4.xml · nonDerivative · entry 3

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,762,208

F3 · ownership.nature: Represents shares of the Issuer held by ACP-Lantern Co-Invest, LLC ("ACP Co-Invest"). ACP GP is the manager of ACP Co-Invest. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Co-Invest. Each of ACP GP and ACP Co-Invest expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-016982 · doc4.xml · nonDerivative · entry 2

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 945,553

F2 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Each of ACP GP and ACP Offshore expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-016982 · doc4.xml · nonDerivative · entry 1

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 3,585,838

F1 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Each of ACP GP and ACP expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-016981 · doc4.xml · nonDerivative · entry 3

Burgstahler David F · CIK 0001374179 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,762,208

F3 · ownership.nature: Represents shares of the Issuer held by ACP-Lantern Co-Invest, LLC ("ACP Co-Invest"). ACP GP is the manager of ACP Co-Invest. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Co-Invest. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-016981 · doc4.xml · nonDerivative · entry 2

Burgstahler David F · CIK 0001374179 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 945,553

F2 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-016981 · doc4.xml · nonDerivative · entry 1

Burgstahler David F · CIK 0001374179 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 3,585,838

F1 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of these relationships, Mr. Burgstahler may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Mr. Burgstahler expressly disclaims beneficial ownership of any such securities, except to the extent of his pecuniary interest therein.

SEC source: 0000899243-17-016090 · doc4.xml · derivative · entry 3

DUFFY MICHAEL P · CIK 0001237200 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,484

Underlying: Common Stock · 20,000 shares

Expires 2018-01-08

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 12, 2017.

F2 · derivative.exercise_date: This option, representing a right to purchase a total of 44,484 shares of common stock, became exercisable in five equal annual installments beginning on January 16, 2009.

SEC source: 0000899243-17-016090 · doc4.xml · nonDerivative · entry 2

DUFFY MICHAEL P · CIK 0001237200 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 168,234

F1 · kind: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 12, 2017.

SEC source: 0000899243-17-016090 · doc4.xml · nonDerivative · entry 1

DUFFY MICHAEL P · CIK 0001237200 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 188,234

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 12, 2017.

SEC source: 0000899243-17-016088 · doc4.xml · nonDerivative · entry 1

Heino Mary Anne · CIK 0001610676 · Director · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 602,468

F1 · kind: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 12, 2017.

SEC source: 0000899243-17-016089 · doc4.xml · nonDerivative · entry 1

LENO SAM R · CIK 0001238660 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,266

F1 · kind: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 8, 2017.

SEC source: 0000899243-17-013377 · doc4.xml · nonDerivative · entry 1

SCHAFFER DERACE L · CIK 0001031735 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 58,730

SEC source: 0000899243-17-012976 · doc4.xml · nonDerivative · entry 1

SCHAFFER DERACE L · CIK 0001031735 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,730

SEC source: 0000899243-17-012648 · doc4.xml · nonDerivative · entry 1

SCHAFFER DERACE L · CIK 0001031735 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 73,730

SEC source: 0000899243-17-012870 · doc4.xml · nonDerivative · entry 3

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 2,602,208

F3 · ownership.nature: Represents shares of the Issuer held by ACP-Lantern Co-Invest, LLC ("ACP Co-Invest"). ACP GP is the manager of ACP Co-Invest. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Co-Invest. Each of ACP GP and ACP Co-Invest expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-012870 · doc4.xml · nonDerivative · entry 2

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,396,274

F2 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners (Offshore), L.P. ("ACP Offshore"). ACP GP is the general partner of ACP Offshore. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP Offshore. Each of ACP GP and ACP Offshore expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.

SEC source: 0000899243-17-012870 · doc4.xml · nonDerivative · entry 1

Avista Capital Partners GP, LLC · CIK 0001374781 · 10% owner

Avista Capital Partners, L.P. · CIK 0001374541 · 10% owner

Avista Capital Partners (Offshore), L.P. · CIK 0001374540 · 10% owner

ACP-Lantern Co-Invest, LLC · CIK 0001613694 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 5,295,117

F1 · ownership.nature: Represents shares of the Issuer held by Avista Capital Partners, L.P. ("ACP"). Avista Capital Partners GP, LLC ("ACP GP") is the general partner of ACP. By virtue of this relationship, ACP GP may be deemed to share voting and dispositive power with respect to the shares of common stock held by ACP. Each of ACP GP and ACP expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.