Two Sigma Securities’s Altimmune ALT Stock Holding History

Two Sigma Securities’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	$77.3K	Buy	+25,435	New	+$76K	0.01%	1337
2026 Q1	–	Sell	-12,274	Closed	-$44.3K	–	1629
2025 Q4	$44.3K	Buy	12,274 +1,024	+9%	+$4.46K	0.01%	1087
2025 Q3	$42.4K	Sell	11,250 -6,861	-38%	-$26.5K	0.01%	1013
2025 Q2	$70.1K	Buy	+18,111	New	+$98K	0.01%	1082
2023 Q2	–	Sell	-33,495	Closed	-$141K	–	2739
2023 Q1	$141K	Buy	+33,495	New	+$398K	﹤0.01%	2149
2017 Q1	–	Sell	-186	Closed	-$181K	–	881
2016 Q4	$181K	Buy	+186	New	+$167K	0.06%	479

Other funds holding ALT

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 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 Malvern, Pennsylvania $4.68T AUM

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return

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 Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Two Sigma Securities's ALT Position: Q2 2026 in Review

Two Sigma Securities opened a new position in Altimmune (ALT) in Q2 2026: 25,435 shares worth $77.3K. The stake represents 0.01% of the portfolio and ranks #1337 among its holdings. This is a return to the name: Two Sigma Securities previously reported a position in ALT as recently as Q4 2025.

Two Sigma Securities first reported a position in ALT in Q4 2016 and has held it in 6 quarters since. The position peaked at $181K in Q4 2016. 210 funds tracked by Wall St. Rank hold ALT as of Q2 2026.

Two Sigma Securities held 25,435 shares of Altimmune worth $77.3K as of Q2 2026.
Altimmune was a new Two Sigma Securities position in Q2 2026.
Altimmune made up 0.01% of Two Sigma Securities's portfolio in Q2 2026, its #1337 holding.
Two Sigma Securities first reported a position in Altimmune in Q4 2016 and has held it in 6 quarters since.
Two Sigma Securities's Altimmune position peaked at $181K in Q4 2016.
210 funds tracked by Wall St. Rank held Altimmune as of Q2 2026.

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