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Seaport Therapeutics, Inc. reports ARCH-affiliated initial holdings in preferred stock that is convertible into common shares. ARCH Venture Fund XII, L.P. holds Series B Preferred Stock representing 2,681,265 underlying shares of Common Stock and Series A-2 Preferred Stock representing 2,513,686 underlying shares, all as indirect ownership.
Each share of Series A-2 Preferred Stock and Series B Preferred Stock is convertible into Common Stock on a one-for-3.1407 basis at the option of the holder and will automatically convert into the stated numbers of common shares upon the closing of the company’s initial public offering, with no additional consideration and no expiration date. The structure runs through ARCH Venture Partners XII, L.P. and ARCH Venture Partners XII, LLC, and investment committee members Keith Crandell, Kristina Burow, Steven Gillis and Robert Nelsen disclaim beneficial ownership beyond any pecuniary interest.
Seaport Therapeutics, Inc. General Counsel Lana Gladstein filed an initial ownership report showing derivative stakes in Seaport’s equity. She holds stock options linked to 63,680, 26,533 and 246,760 shares of common stock at exercise prices of $10.31, $7.39 and $3.05 per share, expiring between 2034 and 2036. She also holds Series B Preferred Stock convertible into 33,515 common shares on a one-for-3.1407 basis, which automatically converts into common stock upon the company’s initial public offering without additional payment. Footnotes explain that one option grant is fully vested, while the others vest over four years in monthly installments, contingent on her continued service.
Seaport Therapeutics, Inc. executive Michael Cunyuan Chen, Chief Scientific Officer, reported his existing equity holdings in a Form 3. He holds several stock options over Common Stock, including options covering 63,680 shares at an exercise price of $10.3100 per share expiring in 2036 and 400,618 shares at $3.0500 per share expiring in 2034. Additional options cover 86,267 and 18,042 underlying shares at an exercise price of $7.3900 with expirations in 2035 and 2034. He also holds Series B Preferred Stock that is convertible into 3,351 shares of Common Stock on a one-for-3.1407 basis, with automatic conversion upon the closing of the company’s initial public offering as described. Footnotes indicate these options vest over time, with some tranches already fully vested and exercisable.
Seaport Therapeutics director Robert J. Hombach reported his holdings of stock options tied to the company’s common stock. He holds options covering 12,258 underlying shares at an exercise price of $10.31 per share that expire on February 23, 2036, and options covering 77,042 underlying shares at $7.39 per share that expire on March 2, 2035.
According to the vesting terms, one grant vests one-third of its underlying shares on March 25, 2026, with the balance vesting in 24 equal monthly installments, while another grant vests in full on February 24, 2027, in each case conditioned on his continued service.
Seaport Therapeutics, Inc. Chief Medical Officer Antony Loebel filed an initial Form 3 showing his derivative and preferred equity interests in the company. He holds stock options over 63,680 shares of common stock at an exercise price of $10.3100 per share, 5,306 shares at $7.3900, and 539,293 shares at $3.0500, all held directly. The filing also reports 20,109 shares of Series B Preferred Stock, which are convertible into common stock on a one-for-3.1407 basis and will automatically convert into the number of shares shown upon the closing of the company’s initial public offering without further payment. Footnotes explain that one option grant vests 25% on July 18, 2025 with the remainder in 36 equal monthly installments, another is fully vested and exercisable, and a third vests in 48 equal monthly installments following February 24, 2026, all subject to his continued service.