X0306 4 2020-11-19 0 0001807901 Pandion Therapeutics, Inc. PAND 0001752139 Becker Daniel J. C/O PANDION THERAPEUTICS, INC., 134 COOLIDGE AVENUE WATERTOWN MA 02472 1 0 0 0 Common Stock 2020-11-19 4 P 0 197716 15.12 A 2827883 I See footnote The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $14.94 per share to $15.39 per share, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote. The shares reported are held directly by AI Pan LLC ("AI Pan"). Each of Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik may be deemed to beneficially own the Issuer's shares beneficially owned by AI Pan, a subsidiary in a multi-tier corporate structure of which Access Industries Holdings LLC is the parent holding company and is ultimately managed by Access Industries Management, LLC and controlled by Mr. Blavatnik. Mr. Becker is a biotechnology principal of Access Industries, Inc., an affiliate of Access Industries Management LLC, and does not have voting or dispositive power over the shares held by AI Pan. Mr. Becker disclaims beneficial ownership of the shares held by AI Pan. /s/ Edward D. Freedman, as attorney-in-fact for Daniel J. Becker 2020-11-23