X0306 4 2020-07-21 0 0001807901 Pandion Therapeutics, Inc. PAND 0001687880 Versant Venture Capital VI, L.P. ONE SANSOME STREET, SUITE 3630 SAN FRANCISCO CA 94104 0 0 1 0 0001765253 Versant Vantage I, L.P. ONE SANSOME STREET SUITE 3630 SAN FRANCISCO CA 94104 0 0 1 0 0001777654 Versant Ventures VI GP, L.P. ONE SANSOME STREET SUITE 3630 SAN FRANCISCO CA 94104 0 0 1 0 0001777652 Versant Ventures VI GP-GP, LLC ONE SANSOME STREET SUITE 3630 SAN FRANCISCO CA 94104 0 0 1 0 0001777651 Versant Vantage I GP, L.P. ONE SANSOME STREET SUITE 3630 SAN FRANCISCO CA 94104 0 0 1 0 0001777653 Versant Vantage I GP-GP, LLC ONE SANSOME STREET SUITE 3630 SAN FRANCISCO CA 94104 0 0 1 0 Common Stock 2020-07-21 4 C 0 3176507 A 3176507 D Common Stock 2020-07-21 4 C 0 577544 A 577544 I See footnote Series A Preferred Stock 2020-07-21 4 C 0 14452795 0.00 D Common Stock 2834220 0 D Series B Preferred Stock 2020-07-21 4 C 0 1745458 0.00 D Common Stock 342287 0 D Series B Preferred Stock 2020-07-21 4 C 0 1245330 0.00 D Common Stock 244211 0 I See footnote Simple Agreement for Future Equity 2020-07-21 4 C 0 333333 0.00 D Common Stock 333333 0 I See footnote The Series A Preferred Stock and Series B Preferred Stock converted into Common Stock on a 5.0994-for-one basis upon the closing of the Issuer's initial public offering without payment of consideration. The Series A Preferred Stock and Series B Preferred Stock were convertible at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering. The shares had no expiration date. The reportable securities are owned directly by Versant Venture Capital VI, L.P. ("Versant VI"). Versant Ventures VI GP, L.P. ("Versant Ventures VI GP") is the general partner of Versant VI, and Versant Ventures VI GP-GP, LLC ("Versant Ventures VI GP-GP") is the general partner of Versant Ventures VI GP. Versant Ventures VI GP and Versant Ventures VI GP-GP may be deemed to indirectly beneficially own the shares beneficially owned by Versant VI, but disclaim beneficial ownership except to the extent of their pecuniary interest therein. The reportable securities are owned directly by Versant Vantage I, L.P. ("Versant Vantage I"). Versant Vantage I GP, L.P. ("Versant Vantage I GP") is the general partner of Versant Vantage I, and Versant Vantage I GP-GP, LLC ("Versant Vantage I GP-GP") is the general partner of Versant Vantage I GP. Versant Vantage I GP and Versant Vantage I GP-GP may be deemed to indirectly beneficially own the shares beneficially owned by Versant Vantage I, but disclaim beneficial ownership except to the extent of their pecuniary interest therein. The Simple Agreement for Future Equity converted into Common Stock automatically upon the closing of the Issuer's initial public offering and had no expiration date. /s/ Versant Venture Capital VI, L.P. By: Versant Ventures VI GP, L.P. Its: General Partner By: Versant Ventures VI GP-GP, LLC Its: General Partner By: Robin L. Praeger Its: Managing Director 2020-07-21 /s/ Versant Vantage I, L.P. By: Versant Vantage I GP, L.P. Its: General Partner By: Versant Vantage I GP-GP, LLC Its: General Partner By: Robin L. Praeger Its: Managing Director 2020-07-21 /s/ Versant Ventures VI GP, L.P. By: Versant Ventures VI GP-GP, LLC Its: General Partner By: Robin L. Praeger Its: Managing Director 2020-07-21 /s/ Versant Vantage I GP, L.P. By: Versant Vantage I GP-GP, LLC Its: General Partner By: Robin L. Praeger Its: Managing Director 2020-07-21 /s/ Versant Ventures VI GP-GP, LLC By: Robin L. Praeger Its: Managing Director 2020-07-21 /s/ Versant Vantage I GP-GP, LLC By: Robin L. Praeger Its: Managing Director 2020-07-21