Transaction · 0001802615-26-000002

Arbet-Engels Christophe

Arbet-Engels Christophe, CMO, reported a transaction classified as exercise at Altimmune, Inc. involving 37500.000000 shares for an estimated $0.00. Reported holdings after the transaction were 112500.000000 shares. A 10b5-1 reference was not detected in the stored filing text.

exerciseSEC transaction code MCMO
ALTAltimmune, Inc.
Filing timeOct 05
Trade dateOct 01, 2026
Filing · SECView on SEC
InsiderProfile
% of reported position tradedUnavailableNot calculated for derivative securities.

Row-level estimate for this security and ownership context, not the insider’s complete portfolio. Joint ownership, other transactions in the filing, amendments and footnotes can affect interpretation.

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$2.67
Pre-filing
1mo ago +19.9%1w ago +13.9%1d ago +7.1%
Returns since
7d30d90d180d1y

ALT price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
ALT since 2026-10-05Filed yesterday · 1 day of post-filing data
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Derivative
Type
exercise
Code M
Identifier
0001802615-26-000002
Restricted Stock Units
Transaction date
Oct 01, 2026
Filed Oct 05, 2026, 08:10 PM · 4d delay
Shares
37.5k sh
$0.00 per share
Estimated value
$0
Computed from shares × price
Holdings after
112k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Derivative Transaction Direct Ownership Large Holdings Reduction
-10score
Filing-only score

-10

Compact filing score computed from stored Form 4 facts. Version v1.

Mixed or weak signal

This filing has a negative filing-only score. It may be less informative as an insider-activity signal and needs extra context.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

Chief Medical Officer

Officer YesDirector No10% NoOther No
Footnotes & amended
  1. F1

    Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested.

  2. F2

    Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs.

  3. F3

    The RSUs become vested over four (4) years with 25% of the shares vesting on October 1, 2026, with the remainder vesting in equal annual installments for the following three (3) years, subject to the…

Original filing · 0001802615-26-000002
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Same reporting owner
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