X0206 3 2016-11-10 0 0001609212 AMG Pantheon Master Fund, LLC N/A 0001688223 Buenneke Brian J C/O PANTHEON VENTURES (US) LP 600 MONTGOMERY STREET SAN FRANCISCO CA 94111 0 0 0 1 Managing Director(1) Units of Beneficial Ownership 0 D Brian Buenneke is a Managing Director of Pantheon (US) LLC and portfolio manager of the fund and does not beneficially own any securities in the fund. Pantheon (US) LLC is the General Partner of Pantheon Ventures (US) LP, the investment adviser of the fund. By: /s/ Brian Buenneke 2017-02-07