X0206 3 2021-02-03 0 0001829802 Sensei Biotherapeutics, Inc. SNSE 0001797409 Cambrian BioPharma Inc 19 MORRIS AVE BROOKLYN NAVY YARD BUILDING, 128 BROOKLYN NY 11025 0 0 1 0 Common Stock 2282825 D Series AA Preferred Convertible Stock Common Stock 110729827 D Series BB Preferred Convertible Stock Common Stock 4821996 D Stock Option (Right to Buy) 3.22 2030-08-04 Common Stock 19520 D The shares are held by Cambrian Biopharma, Inc., a Delaware corporation ("Cambrian"). The Chief Executive Officer of Cambrian, James Peyer, may direct the voting and disposition of the shares held by Cambrian, subject in certain instances to the approval of Cambrian's Board of Directors. Mr. Peyer disclaims beneficial ownership of such shares. Each share of the Series AA Preferred Stock and Series BB Preferred Stock is convertible, at any time, at the holder's election, into 0.0208333 shares of the Issuer's common stock. In addition, effective immediately prior to the closing of the Issuer's initial public offering of its common stock, each share of Series AA Preferred Stock and Series BB Preferred Stock will automatically convert into 0.0208333 shares of the Issuer's common stock. The Series AA Preferred Stock and Series BB Preferred Stock haves no expiration date. Mr. Peyer disclaims beneficial ownership of such shares. The shares subject to the option vest monthly over twenty-four (24) months from the vesting commencement date, March 31, 2020, subject to the continuous service of James Peyer on the Issuer's Board of Directors. Mr. Peyer is the Chief Executive Officer of Cambrian and disclaims beneficial ownership of such shares. Exhibit 24- Power of Attorney Cambrian Biopharma, Inc. By: /s/ James Peyer James Peyer CEO 2021-02-03