JO
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John Overdeck’s Altimmune ALT Stock Holding History

John Overdeck’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 		$7.24M Sell
2,381,142
-97,758
-4% -$292K 0.01% 1797
2026
Q1 		$7.64M Buy
2,478,900
+1,213,217
+96% +$5.15M 0.01% 1629
2025
Q4 		$4.57M Sell
1,265,683
-731,165
-37% -$3.19M 0.01% 1795
2025
Q3 		$7.53M Buy
1,996,848
+1,559,562
+357% +$6.02M 0.01% 1141
2025
Q2 		$1.69M Sell
437,286
-710,530
-62% -$3.85M ﹤0.01% 1942
2025
Q1 		$5.74M Buy
1,147,816
+542,513
+90% +$3.44M 0.01% 1050
2024
Q4 		$4.36M Buy
605,303
+151,001
+33% +$1.15M 0.01% 1188
2024
Q3 		$2.79M Sell
454,302
-122,264
-21% -$828K 0.01% 1463
2024
Q2 		$3.83M Buy
+576,566
New +$4.25M 0.01% 1135
2023
Q4 		– Sell
-667,420
Closed -$1.74M – 3125
2023
Q3 		$1.74M Sell
667,420
-319,400
-32% -$916K ﹤0.01% 1504
2023
Q2 		$3.48M Sell
986,820
-57,367
-5% -$258K 0.01% 1100
2023
Q1 		$4.41M Buy
1,044,187
+267,890
+35% +$3.18M 0.01% 974
2022
Q4 		$12.8M Sell
776,297
-201,350
-21% -$2.26M 0.04% 477
2022
Q3 		$12.5M Buy
977,647
+362,029
+59% +$5.35M 0.04% 428
2022
Q2 		$7.2M Buy
615,618
+11,198
+2% +$69.1K 0.02% 625
2022
Q1 		$3.68M Buy
604,420
+27,998
+5% +$206K 0.01% 1071
2021
Q4 		$5.28M Buy
+576,422
New +$6.12M 0.01% 1168
2021
Q2 		– Sell
-26,399
Closed -$373K – 3993
2021
Q1 		$373K Sell
26,399
-14,453
-35% -$234K ﹤0.01% 3171
2020
Q4 		$461K Sell
40,852
-611,316
-94% -$7.2M ﹤0.01% 2569
2020
Q3 		$8.61M Buy
652,168
+636,269
+4,002% +$12.7M 0.03% 562
2020
Q2 		$170K Buy
+15,899
New +$87.3K ﹤0.01% 2691
2019
Q1 		– Sell
-12,481
Closed -$26K – 2988
2018
Q4 		$26K Buy
+12,481
New +$44.2K ﹤0.01% 2884
2017
Q2 		– Sell
-449
Closed -$109K – 2922
2017
Q1 		$109K Sell
449
-948
-68% -$507K ﹤0.01% 2786
2016
Q4 		$1.36M Buy
+1,397
New +$1.25M 0.01% 1777

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 $3.37T AUM 44.26% 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

John Overdeck's ALT Position: Q2 2026 in Review

John Overdeck reduced its Altimmune (ALT) stake by 3.9% in Q2 2026, selling an estimated $292K and leaving 2,381,142 shares worth $7.24M. The position accounts for 0.01% of the portfolio, ranked #1797.

John Overdeck first reported a position in ALT in Q4 2016 and has held it in 24 quarters since. The position peaked at $12.8M in Q4 2022. 209 funds tracked by Wall St. Rank hold ALT as of Q2 2026.

  • John Overdeck held 2,381,142 shares of Altimmune worth $7.24M as of Q2 2026.
  • John Overdeck sold 97,758 Altimmune shares in Q2 2026, an estimated $292K.
  • Altimmune made up 0.01% of John Overdeck's portfolio in Q2 2026, its #1797 holding.
  • John Overdeck first reported a position in Altimmune in Q4 2016 and has held it in 24 quarters since.
  • John Overdeck's Altimmune position peaked at $12.8M in Q4 2022.
  • 209 funds tracked by Wall St. Rank held Altimmune as of Q2 2026.

Based on Two Sigma Investments's 13F filing for Q2 2026, filed 14 Aug 2026.