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ALT in the 13F filings

Altimmune Inc · CUSIP 02155H200

Sector · Pharmaceuticals and biotechnologyTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Pharmaceutical preparations
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q4 2022
Quarter end
31 Dec 2025
the date the book describes
Filed
19 Feb 2026
latest of these filings; the earliest 10 Feb 2026
Managers listing it
24
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 1 listed it in both
Shares listed
10,654,731
combined, among listed positions
Reported value
$38m
combined, at the quarter end

Among the 92 comparable managers: 14 buyers (opened or added shares) and 9 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +1,042,963.

Managers listing ALT in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

24 of 24 holders

ActionFiling
Jane Street Group LLC1,783,950$6.4munder 0.1%Added+1,503,75112 Feb 2026 (the filing on sec.gov)
Susquehanna International Group LLP1,369,017$4.9munder 0.1%Trimmed-5,16517 Feb 2026 (the filing on sec.gov)
D. E. Shaw & Co.1,343,583$4.8munder 0.1%Added+983,18817 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC1,337,927$4.8munder 0.1%Added+55,91317 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP1,265,683$4.6munder 0.1%Trimmed-731,16517 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP922,777$3.3munder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
Two Sigma Advisers LP793,900$2.9munder 0.1%Trimmed-634,50017 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)564,093$2.0munder 0.1%Added+118,95617 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP257,271$929kunder 0.1%Trimmed-7,53117 Feb 2026 (the filing on sec.gov)
Invesco Ltd214,824$776kunder 0.1%Added+52,88119 Feb 2026 (the filing on sec.gov)
Millennium Management LLC207,383$749kunder 0.1%Trimmed-160,19917 Feb 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP114,128$412kunder 0.1%Trimmed-108,81417 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP71,760$259kunder 0.1%Held017 Feb 2026 (the filing on sec.gov)
Verition Fund Management LLC69,476$251kunder 0.1%Added+38,32213 Feb 2026 (the filing on sec.gov)
Walleye Capital LLC65,665$237kunder 0.1%Added+50,14713 Feb 2026 (the filing on sec.gov)
Balyasny Asset Management LLC60,109$217kunder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc49,879$181kunder 0.1%Added+8,38617 Feb 2026 (the filing on sec.gov)
Acadian Asset Management LLC35,732$128kunder 0.1%Newnew10 Feb 2026 (the filing on sec.gov)
Squarepoint Ops LLC34,949$126kunder 0.1%Trimmed-549,74713 Feb 2026 (the filing on sec.gov)
Farallon Capital Management LLC27,600$100kunder 0.1%Held017 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC21,147$76kunder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Man Group PLC18,936$68kunder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC13,021$47kunder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP11,921$43kunder 0.1%Trimmed-166,25617 Feb 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q3 2025 to Q4 2025, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (6)

Exited (1)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
1 in Q3 2024 to 1 in Q2 2026

Tracked managers listing it, at least.

02462022202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
ALT by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20201$8.4mn.a.n.a.
Q3 20201$952kn.a.n.a.
Q2 20211$15mn.a.n.a.
Q3 20211$3.9mn.a.n.a.
Q4 20212$6.8mn.a.n.a.
Q1 20222$5.9mn.a.n.a.
Q2 20222$8.0mn.a.n.a.
Q3 20224$89mn.a.n.a.
Q4 20225$133mn.a.n.a.
Q4 20231$382k10
Q1 20242$7.0m20
Q2 20241$184k01
Q3 20241$169k00
Q4 20241$199k00
Q1 20251$138k00
Q2 20251$107k00
Q3 20251$104k00
Q4 20251$100k149
Q1 20261$85k1012
Q2 20261$20m207

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

ALT and LLY →ALT and JNJ →ALT and VRTX →Choose a stock to compare with ALT →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own ALT, latest filings →Back to the 13F Explorer →