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Harbor Advisors’s Lantheus LNTH Stock Holding History

Harbor Advisors’s Portfolio LNTH Stock Details LNTH Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-4,000
Closed -$266K – 200
2025
Q4 		$266K Hold
4,000
– – 0.04% 160
2025
Q3 		$205K Hold
4,000
– – 0.03% 176
2025
Q2 		$327K Buy
4,000
+1,500
+60% +$132K 0.05% 149
2025
Q1 		$244K Hold
2,500
– – 0.04% 167
2024
Q4 		$224K Buy
+2,500
New +$244K 0.04% 176

Other funds holding LNTH

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
FCM
Farallon Capital Management San Francisco, California $21.7B AUM 79.24% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London $209B AUM 37.72% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Harbor Advisors's LNTH Position: Q1 2026 in Review

Harbor Advisors sold out of Lantheus (LNTH) in Q1 2026, closing a stake of 4,000 shares — an estimated $266K sold.

Harbor Advisors first reported a position in LNTH in Q4 2024 and held it in 5 quarters. The position peaked at $327K in Q2 2025. 407 funds tracked by Wall St. Rank hold LNTH as of Q1 2026.

  • Harbor Advisors reported no remaining Lantheus position as of Q1 2026 after selling out during the quarter.
  • Harbor Advisors sold 4,000 Lantheus shares in Q1 2026, an estimated $266K.
  • Harbor Advisors first reported a position in Lantheus in Q4 2024 and held it in 5 quarters.
  • Harbor Advisors's Lantheus position peaked at $327K in Q2 2025.
  • 407 funds tracked by Wall St. Rank held Lantheus as of Q1 2026.

Based on Harbor Advisors's 13F filing for Q1 2026, filed 7 May 2026.