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Rock Springs Capital Management’s Altimmune ALT Stock Holding History

Rock Springs Capital Management’s Portfolio ALT Stock Details ALT Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$1.43M Buy
+471,465
New +$1.41M 0.07% 94
2023
Q3 		– Sell
-223,255
Closed -$788K – 121
2023
Q2 		$788K Hold
223,255
– – 0.02% 117
2023
Q1 		$942K Hold
223,255
– – 0.02% 114
2022
Q4 		$3.67M Hold
223,255
– – 0.09% 94
2022
Q3 		$2.85M Buy
+223,255
New +$3.3M 0.07% 106

Other funds holding ALT

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
DTC
Deep Track Capital Greenwich, Connecticut $6.87B AUM 205.24% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
TCM
TCG Crossover Management Palo Alto, California $4.16B AUM 983.43% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Marshall Wace
Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.1B AUM 21.36% 1-Year Est. Return
RCM
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Rock Springs Capital Management's ALT Position: Q2 2026 in Review

Rock Springs Capital Management opened a new position in Altimmune (ALT) in Q2 2026: 471,465 shares worth $1.43M. The stake represents 0.07% of the portfolio and ranks #94 among its holdings. This is a return to the name: Rock Springs Capital Management previously reported a position in ALT as recently as Q2 2023.

Rock Springs Capital Management first reported a position in ALT in Q3 2022 and has held it in 5 quarters since. The position peaked at $3.67M in Q4 2022. 210 funds tracked by Wall St. Rank hold ALT as of Q2 2026.

  • Rock Springs Capital Management held 471,465 shares of Altimmune worth $1.43M as of Q2 2026.
  • Altimmune was a new Rock Springs Capital Management position in Q2 2026.
  • Altimmune made up 0.07% of Rock Springs Capital Management's portfolio in Q2 2026, its #94 holding.
  • Rock Springs Capital Management first reported a position in Altimmune in Q3 2022 and has held it in 5 quarters since.
  • Rock Springs Capital Management's Altimmune position peaked at $3.67M in Q4 2022.
  • 210 funds tracked by Wall St. Rank held Altimmune as of Q2 2026.

Based on Rock Springs Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.