2025-04-17T06:57:11-05:00 2024-12-31 Foundation Source 3333 New Hyde Park Rd Ste 406 New Hyde Park NY 11042 990PF 2024-01-01 201266221 The Black Dog Private Foundation Inc % Foundation Source BLAC 8008391754 Foundation Source 501 Silverside Rd Wilmington DE 198091377 David Mahoney President 8008391754 2025-04-09 true true Jeffrey D Haskell P01345770 8008391754 2024 2025-03-06 01:10:19Z X 5163046 X 165681 9032 9032 129496 129496 3477 835267 149482 307686 288010 0 6274 6274 3267 23718 23718 33259 6274 23718 60500 60500 93759 6274 84218 213927 281736 256477 388740 388740 3557340 3639004 4774306 3813817 4027744 5163046 0 0 X 3813817 4027744 3813817 4027744 3813817 4027744 3813817 213927 4027744 4027744 Publicly-traded Securities 835267 685785 149482 149482 149482 3916 3916 3916 2500 0 2500 X 0 1416 false false false false false false false true true DE true false false false false true Foundation Source 8008391754 501 Silverside Road Suite 123 Wilmington DE 198091377 false false false false false false false false false false false false false false false false false false false false false Winnifred Ellis Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, VP 1.0 0 0 0 David L Mahoney Foundation Source 501 Silverside Rd Wilmington DE 198091377 Pres, Dir, Sec 1.0 0 0 0 4168515 267291 0 4435806 0 4435806 66537 4369269 218463 218463 3916 3916 214547 214547 214547 84218 0 0 0 0 84218 214547 161191 272755 27073 835670 552196 1848885 84218 84218 0 130329 130329 1718556 0 30862 1687694 272755 27073 835670 552196 David L Mahoney Winnifred Ellis X AMERICAN CONSERVATORY THEATRE FOUNDATION 415 GEARY ST SAN FRANCISCO CA 94102 N/A PC General & Unrestricted 5000 BLACK MOUNTAIN HOME FOR CHILDREN YOUTH & FAMILIES 80 LAKE EDEN RD BLACK MTN NC 28711 N/A PC Emergency housing and/or relief fund 2500 BOYS & GIRLS CLUBS OF SAN FRANCISCO 380 FULTON ST SAN FRANCISCO CA 94102 N/A PC General & Unrestricted 5000 MERCY CORPS PO BOX 37800 BOONE IA 50037 N/A PC General & Unrestricted 30000 SAVE THE BAY 560 14TH ST 400 OAKLAND CA 94612 N/A PC General & Unrestricted 1000 THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIO PO BOX 20466 STANFORD CA 94309 N/A PC For support of the "Second Nature: Photography in the Age of Anthropocene" Exhibition 5000 THE PHILANTHROPY WORKSHOP INC 110 E 25TH ST NEW YORK NY 10010 N/A PC General & Unrestricted 12000 60500 14 9032 14 129496 18 3477 142005 142005 false false false false false false false false false false X X 1 Mahoney David 121 Jordan Ave San Francisco CA 94118 165681 X 1 Avidity Biosciences, Inc. RNA, 4125 sh. 165681 2024-06-27 ASPIRIANT DEFENSIVE ALLOCATION 369123 372782 ASPIRIANT RISK MANAGED GLOBAL 396483 472537 ASPIRIANT RISK-MANAGED TAXABLE 778832 773683 CORCEPT THERAPEUTICS INC 1362289 2325348 DFA EMERGING MARKETS CORE EQ P 43751 50618 DFA EMERGING MARKETS VALUE POR 47096 50081 DFA INTERNATIONAL CORE EQUITY 199472 223603 DFA INTERNATIONAL SMALL CAP VA 76000 86377 ISHARES CORE US VALUE 104158 129533 ISHARES S&P 500 INDEX FD 103767 118913 VANGUARD DIVIDEND GROWTH FD 75268 75903 VANGUARD SMALL-CAP VALUE ETF 82765 94928 Administrative Fees 23693 23693 State or Local Filing Fees 25 25 Investment Management Services 6274 6274 990-PF Estimated Tax for 2024 2500 990-PF Excise Tax for 2023 767