Welcome to our dedicated page for Immuneering SEC filings (Ticker: IMRX), 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.
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Insider purchase by Director Peter Feinberg. The filing shows a purchase of 7,500 shares of Class A common stock on 10/03/2025 at a reported price of $6.67 per share. After the transaction, Mr. Feinberg directly owns 156,766 shares and indirectly beneficially owns larger stakes through entities: 392,242, 476,615, and 115,441 shares via three general‑partner relationships, bringing total reported beneficial holdings across direct and indirect positions to a material position in the company.
HBM Healthcare Investments (Cayman) Ltd. filed a Schedule 13G reporting beneficial ownership of 3,646,304 shares of Immuneering Corp Class A common stock, representing approximately 5.7% of the 63,483,397 shares outstanding as of September 30, 2025. The filing states the shares were not acquired to change or influence control of the company and that voting and investment power is exercised by HBM's board.
The reporting person is organized in the Cayman Islands and lists sole voting and dispositive power over all reported shares. The statement includes a signature by Jean-Marc LeSieur, Managing Director, dated 10/03/2025.
Insider purchase reported: Immuneering Corp (IMRX) Chief Accounting Officer Mallory Morales reported acquiring 300 shares of Class A common stock on 10/01/2025 at a price of $6.39 per share. After the transaction, Morales beneficially owns 27,533 shares. The Form 4 was signed by an attorney-in-fact on 10/02/2025. No derivative transactions or additional remarks were reported in the filing.
Insider transaction reported for Immuneering Corp (IMRX). Leah R. Neufeld, listed as Chief People Officer and reporting person, purchased 800 shares of Class A common stock on 10/01/2025 at a price of $6.3792 per share. After the purchase, the filing reports 23,344 shares beneficially owned. The Form 4 was signed on behalf of Ms. Neufeld by an attorney-in-fact and dated 10/02/2025.
Immuneering Corp (IMRX) Chief Legal Officer and Secretary Michael D. Bookman reported a personal purchase of 1,020 shares of Class A common stock on 10/01/2025 at a price of $6.8299 per share. Following the transaction, Mr. Bookman beneficially owns 4,870 shares. The Form 4 was signed on 10/02/2025 and lists his role as an officer and director. No derivative transactions or additional remarks were reported on the filing.
Insider purchase reported by Immuneering Corp (IMRX) Peter Feinberg, identified as a Director, reported purchasing 7,500 shares of Class A Common Stock on 09/30/2025 at a weighted-average price of $7.0307 per share. After the purchase Feinberg directly beneficially owned 149,266 shares and also reported indirect holdings of 392,242 shares via PF Associates L.P., 476,615 shares via PEF LLC, and 115,441 shares via S4K Investments LLC. The filing notes the purchase was executed in multiple trades at prices from $7.0049 to $7.055. The Form 4 is signed by an attorney-in-fact on 10/01/2025.
Peter Feinberg, a director of Immuneering Corp (IMRX), reported a purchase of 5,000 Class A common shares on 09/29/2025 at a price of $7.18 per share. After the transaction he beneficially owns 141,766 shares directly, plus additional indirect holdings through entities (392,242; 476,615; 115,441), as listed on the Form 4. The filing was signed by an attorney-in-fact on 09/30/2025. This Form 4 discloses an insider purchase that increases the reporting person’s stake but contains no other financial metrics or commentary.
Immuneering Corporation (IMRX) is offering 18,959,914 shares of Class A common stock at $9.23 per share, with underwriters able to purchase up to 2,843,987 additional shares. Net proceeds from the offering and a contingent concurrent private placement with Aventis Inc., a Sanofi subsidiary, are estimated at approximately $187.4 million (about $212.0 million if the underwriters exercise their option). The company reported updated interim Phase 1/2a atebimetinib data: in 34 first-line pancreatic cancer patients dosed at 320 mg once daily with mGnP, 86% overall survival and 53% progression-free survival at nine months (median PFS 9.6 months; median OS not reached) with a median follow-up of nine months; Grade ≥3 treatment-emergent adverse events included anemia in 24% and neutropenia in 18% of patients and no Grade 5 TEAEs. Proceeds are intended to advance development and are projected to fund operations into 2029 based on current plans. The private placement of up to $25.0 million is contingent on a qualified public offering of at least $75.0 million and includes customary ownership limits and lock-up/standstill provisions.
Immuneering Corporation entered into an underwriting agreement to sell 18,959,914 shares of its Class A common stock at $9.23 per share in a public offering under an effective shelf registration, with underwriters holding a 30-day option to buy up to 2,843,987 additional shares. All shares are being sold by the company.
Concurrently, Immuneering agreed to a $25.0 million private placement with Aventis Inc., a Sanofi subsidiary, under which Aventis will purchase 2,708,559 Class A shares at the same price, contingent on the closing of the public offering. The company expects net proceeds of about $164.1 million from the offering and $23.3 million from the private placement, to fund preclinical and clinical development, working capital, and general corporate purposes.
Immuneering states that its cash, cash equivalents, marketable securities and these net proceeds should fund operations into 2029. In connection with the deal, it reduced the capacity of its existing $100,000,000 at-the-market program by $1,250,007 to $98,749,993 and suspended sales under that ATM amount.
Immuneering Corporation (IMRX) is offering shares of its Class A common stock and pre-funded warrants, with a concurrent private placement with Aventis Inc., a wholly owned subsidiary of Sanofi, to purchase up to $25.0 million of stock contingent on a firm-commitment public offering that raises at least $75.0 million.
Clinical update: in a 320 mg once-daily atebimetinib plus modified gemcitabine/nab-paclitaxel cohort (N=34, cutoff August 26, 2025), Immuneering reported 86% overall survival and 53% progression-free survival at nine months, median PFS 9.6 months, median OS not reached; six-month rates were 94% OS and 70% PFS. Grade ≥3 TEAEs ≥10% included anemia (24%) and neutropenia (18%); no Grade 5 TEAEs reported.
The company’s Class A common stock trades on Nasdaq under IMRX (last reported sale $8.59 on September 23, 2025). Underwriters will receive a 6.0% commission and an option to purchase additional shares. The private placement shares will not be registered and are expected to close concurrent with the qualified public offering.