Welcome to our dedicated page for Altimmune SEC filings (Ticker: ALT), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
Altimmune, Inc. filings document a late clinical-stage biopharmaceutical issuer focused on pemvidutide for serious liver diseases, along with the capital structure used to support that development. Its Form 8-K reports cover operating-result announcements, underwriting agreements, registered direct and at-the-market equity programs, pre-funded warrants, common stock warrants and loan agreement amendments.
Altimmune’s proxy and annual meeting materials disclose shareholder voting matters, governance procedures, executive compensation information and amendments to its certificate of incorporation, including authorized-share matters. The filings also identify its common stock as listed on The Nasdaq Global Market under the symbol ALT.
Altimmune, Inc. established a new at-the-market equity offering program, allowing it to sell shares of common stock, from time to time at its sole discretion, for up to $200.0 million through Leerink Partners LLC as sales agent. Sales may be made on Nasdaq or other trading markets under an effective Form S-3 and related prospectus supplement, with a sales agent commission of up to 3.0% of gross proceeds.
The company also terminated its prior at-the-market facility, which authorized up to $150.0 million in sales through multiple agents. The new agreement contains customary terms, including indemnification and conditions, and does not require funds to be placed in escrow.
Altimmune, Inc. announced an at-the-market equity program to sell, from time to time, shares of its common stock for up to $200.0 million under a prospectus supplement, with Leerink Partners LLC acting as sales agent. Sales will be made as “at the market offerings” under Rule 415(a)(4) on Nasdaq (symbol ALT).
The sales agent will receive a commission of up to 3.0% of the aggregate gross sales price, and will be deemed an underwriter. Altimmune states it intends to use net proceeds for working capital and general corporate purposes, which may include R&D, clinical and regulatory activities, potential acquisitions or investments, and possible repayment or repurchase of securities.
Shares outstanding were 95,598,665 as of September 30, 2025. The company notes there is no escrow arrangement and no obligation for the sales agent to sell a specific amount; offerings may be suspended or terminated in accordance with the agreement.
Altimmune reported Q3 2025 results with a net loss of $19.0 million as operating expenses declined versus last year. Research and development was $15.0 million, reflecting lower MASH trial spend, while general and administrative was $5.9 million.
Liquidity strengthened. Cash, cash equivalents, restricted cash and short‑term investments totaled $210.8 million as of September 30, 2025. The company raised $112.1 million year‑to‑date via at‑the‑market sales and drew a $15.0 million first tranche under a term loan. Subsequent to quarter‑end, Altimmune raised $33.8 million more through the ATM and amended its Hercules facility to $125.0 million, drawing a second $20.0 million tranche; the amended loan bears the greater of 9.70% or prime plus 2.45% with a 30‑month interest‑only period.
Pipeline updates noted 24‑week IMPACT Phase 2b MASH topline results, Fast Track designation for pemvidutide in AUD, and ongoing Phase 2 trials in AUD and ALD. Shares outstanding were 104,254,173 as of October 31, 2025.
Altimmune, Inc. amended its loan agreement with Hercules Capital, increasing total term loan availability from $100.0 million to $125.0 million.
The facility provides up to four tranches: the first tranche of $15.0 million was drawn on May 13, 2025; the second tranche of $20.0 million was drawn at the November 5, 2025 amendment closing. A third tranche of up to $10.0 million becomes available upon achieving specified milestones, and a fourth tranche of up to $80.0 million is subject to lender approval.
The amended term loan bears interest at the greater of 9.70% per annum or the WSJ prime rate + 2.45%. The interest‑only period was extended to 30 months from May 13, 2025, which delays principal amortization. Altimmune also furnished a press release announcing third‑quarter results ended September 30, 2025.
Altimmune (ALT) reported a Form 4 for its Chief Financial Officer detailing new equity awards granted on October 1, 2025.
The filing shows stock options for 166,800 shares at an exercise price of $3.87, expiring on October 1, 2035, and 57,900 restricted stock units. The options vest over four years: 25% on October 1, 2026, then in equal monthly installments over the following 36 months. The RSUs vest over four years: 25% on October 1, 2026, then in equal annual installments for the next three years. The awards are reported as held directly.
Altimmune, Inc. insider Christophe Arbet-Engels, the company's Chief Medical Officer, reported awards on 10/01/2025 consisting of 450,000 stock options with a $3.87 exercise price and 150,000 restricted stock units (RSUs). The options vest over four years with 25% vesting on 10/01/2026 and the remainder monthly over the next 36 months, subject to continued service. The RSUs vest over four years with 25% on 10/01/2026 and the remainder in annual installments over three years and have no expiration date. The Form 4 was signed by an attorney-in-fact on 10/03/2025.
Altimmune, Inc. (ALT) filed a Form 3 reporting that Christophe Arbet-Engels, serving as Chief Medical Officer and an officer/director, has no securities beneficially owned in the company as of the event date 10/01/2025. The filing notes a Power of Attorney (Exhibit 24) and is signed by Gregory Weaver, as Attorney-in-Fact on 10/03/2025. This is an initial ownership statement required by Section 16; it discloses the reporting person’s relationship to the issuer and that no equity or derivative holdings are reported on the form.
Altimmune, Inc. reported a planned leadership transition in its medical organization. Former Chief Medical Officer Dr. Scott Harris has entered into a Transitional Services and Release Agreement and stepped down from the CMO role effective October 1, 2025, becoming Senior Strategic Advisor through his previously announced retirement date of February 28, 2026. The company has appointed Christophe Arbet-Engels, MD, PhD as the new Chief Medical Officer, effective October 1, 2025.
During the transition period, Dr. Harris will help transfer responsibilities and continue as an employee, receiving his current salary and benefits, continued vesting of outstanding equity awards through the separation date, an extension of his stock option exercise period to 12 months after separation, and eligibility for a full 2025 cash bonus, all conditioned on a release of claims and compliance with customary covenants.
Catherine A. Sohn, a director of Altimmune, Inc. (ALT), was granted stock options covering 48,800 shares with an exercise price of $3.92. The options become vested and exercisable in substantially equal monthly installments over the 12 months following the 09/25/2025 grant date, and they expire on 09/25/2035. After the grant the reporting person beneficially owns 48,800 option shares on a direct basis. The grant is an equity-based director compensation intended to align interests with shareholders; if exercised it will convert into common stock.
Altimmune, Inc. (ALT) director Jerome Benedict Durso was granted stock options on 09/25/2025 to purchase 48,800 shares of common stock at an exercise price of $3.92 per share. The options become exercisable in substantially equal monthly installments over the 12 months following the grant date, subject to continued service. Following the grant, Durso beneficially owns 48,800 options. The Form 4 was filed by a single reporting person and signed by an attorney-in-fact on 09/29/2025.