X0306 4 2017-12-01 0 0001609212 AMG Pantheon Master Fund, LLC N/A 0001662508 Kaiser Foundation Hospitals ONE KAISER PLAZA ORDWAY BUILDING OAKLAND CA 94612 0 0 1 0 Units of Beneficial Interest 2017-12-01 4 P 0 397456.28 12.58 A 5235595.12 D $12.58 is an approximate price and is the net asset value per Unit of Beneficial Interest ("Unit") as of October 31, 2017. The Reporting Person purchased $5 million worth of Units in the Fund. /s/ Janice Murphy, Name: Janice Murphy, Title: V.P. of Pensions and Investments 2017-12-05