X0206 3 2021-02-03 0 0001785345 Landos Biopharma, Inc. LABP 0001678736 Poukalov Konstantin C/O LANDOS BIOPHARMA, INC. 1800 KRAFT DRIVE, SUITE 216 BLACKSBURG VA 24060 1 0 1 0 Series A Preferred Stock 0.00 Common Stock 5883538 I By funds Series B Preferred Stock 0.00 Common Stock 7486190 I By funds Each share of the Issuer's Series A preferred stock will automatically convert into 1.8249 shares of the Issuer's common stock immediately upon the closing of the Issuer's initial public offering. The Series A preferred stock has no expiration date. Consists of 2,941,769 shares of common stock issuable upon conversion of Series A preferred stock held by Perceptive Life Sciences Master Fund, Ltd. ("PLSMF") and 2,941,769 shares of common stock issuable upon conversion of Series A preferred stock held by Perceptive Xontogeny Venture Fund, LP ("PXVF"). Perceptive Advisors, LLC ("Perceptive Advisors") serves as the investment manager to PLSMF and PXVF. The Reporting Person is a managing director of Perceptive Advisors. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein. Securities are held by Perceptive Life Sciences Master Fund, Ltd. Perceptive Advisors LLC ("Perceptive Advisors") serves as the investment manager to Perceptive Life Sciences Master Fund Ltd. and as a result may be deemed to have beneficial ownership over such securities. The Reporting Person is a Managing Director of Perceptive Advisors and may be deemed to indirectly beneficially own the securities. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein. Each share of the Issuer's Series B preferred stock will automatically convert into 1.8249 shares of the Issuer's common stock immediately upon the closing of the Issuer's initial public offering. The Series B preferred stock has no expiration date. Consists of 2,857,795 shares of common stock issuable upon conversion of Series B preferred stock held by PLSMF, 2,857,795 shares of common stock issuable upon conversion of Series B preferred stock held by PXVF and 1,770,600 shares of common stock issuable upon conversion of Series B preferred stock held by PX Venture (A), LLC ("PXV"). Perceptive Advisors serves as the investment manager to PLSMF, PXVF and PXV. The Reporting Person is a managing director of Perceptive Advisors. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein. Securities are held by Perceptive Xontogeny Venture Fund, LP. Perceptive Advisors serves as the investment manager to Perceptive Xontogeny Venture Fund, LP and as a result may be deemed to have beneficial ownership over such securities. The Reporting Person is a Managing Director of Perceptive Advisors and may be deemed to indirectly beneficially own the securities. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein. Exhibit List - Exhibit 24 - Power of Attorney /s/ Eric W. Blanchard, Attorney-in-Fact 2021-02-03