Form 4 for ALT Altimmune, Inc.
Accepted 2026-09-17 16:05:29 ET · period of report 2026-09-16 · accession 0001595064-26-000002 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| D | 2026-09-17 16:05 | 2026-09-16 | ALT | Richardson Linda M | Chief Commercial Off | M - OptEx | $0.00 | +24.0K | 24.0K | New | $0 |
| D | 2026-09-17 16:05 | 2026-09-16 | ALT | Richardson Linda M | Chief Commercial Off | F - Tax | $3.24 | -6,826 | 17.2K | -28% | -$22.1K |
| D | 2026-09-17 16:05 | 2026-09-16 | ALT | Richardson Linda M | Chief Commercial Off | M - OptEx | $0.00 | -24.0K | 72.0K | -25% | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock, par value $0.0001 | 2026-09-16 | M | A | 24,000 | $0.00 | 24,000 | D | — | — | (F1) Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested. |
| 2 | Common | Common Stock, par value $0.0001 | 2026-09-16 | F | D | 6,826 | $3.24 | 17,174 | D | — | — | (F2) Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs. |
| 3 | Derivative | Restricted Stock Units | 2026-09-16 | M | D | 24,000 | $0.00 | 72,000 | D | — · — to — | 24,000 Common Stock, par value $0.0001 | (F1) Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested. (F3) The RSUs become vested over four (4) years with 25% of the shares vesting on September 16, 2026, with the remainder vesting in equal annual installments for the following three (3) years, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date. (F3) The RSUs become vested over four (4) years with 25% of the shares vesting on September 16, 2026, with the remainder vesting in equal annual installments for the following three (3) years, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date. |