2019-10-31T14:21:52-05:00 2018-12-31 Foundation Source One Hollow Ln Ste 212 Lake Success NY 11042 990PF 2018-01-01 061331577 The Mayer-Phillips Foundation Inc % Foundation Source MAYE 8008391754 Foundation Source 501 Silverside Rd Wilmington DE 198091377 ALESSANDRA MAYER vice president 8008391754 2019-10-23 true Jeffrey D Haskell P01345770 8008391754 24.187.244.114 06391520193045000005 2019-10-31 P BC971FC33BAF52379132A0473611089A0DAEC697 0C5E5A4654C1C37B4810F575F1A1D05F0CA21AED 2018 2019-02-21 02:37:17Z X 7066698 X 797509 1474 1474 150859 150859 216071 1780402 450125 5408 5408 1171321 607866 35000 35000 2888 2888 14720 14720 9236 42623 5602 37021 104467 20322 74909 330250 330250 434717 20322 405159 736604 587544 357318 251213 251213 5321704 6182717 6465150 51675 37365 46354 187572 183578 303981 5918269 6654873 7066698 0 0 X 5918269 6654873 5918269 6654873 5918269 6654873 5918269 736604 6654873 6654873 Publicly-traded Securities 1780402 1340184 440218 440218 Passthrough K1 Capital Gain/(Loss) 9907 450125 false 233544 6624223 0.035256 99133 5892615 0.016823 473366 5802951 0.081573 165930 5610729 0.029574 131861 4524737 0.029142 0.192368 0.038474 6964299 267944 5875 273819 405159 X 5875 5875 5875 6000 6045 12045 X 6170 6170 false false false false false false false true true CT true false false false false true Foundation Source 8008391754 501 Silverside Road Suite 123 Wilmington DE 198091377 false false false false true false false false false false false false false false false false false false false false false false Alessandra Mayer Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, VP 12.0 35000 0 0 Barbara P Mayer Foundation Source 501 Silverside Rd Wilmington DE 198091377 Pres, Dir 1.0 0 0 0 Christa A Mayer Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir 1.0 0 0 0 John A Mayer Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, Sec 1.0 0 0 0 Timothy P Mayer Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, Treas 1.0 0 0 0 6667418 98957 303979 7070354 0 7070354 106055 6964299 348215 348215 5875 5875 342340 342340 342340 405159 0 0 0 0 405159 5875 399284 342340 295536 2016 2015 2014 405159 295536 109623 0 0 232717 0 0 Barbara P Mayer John A Mayer X 5280 HIGH SCHOOL 899 N BROADWAY DENVER CO 80203 N/A PC General & Unrestricted 50000 ASSOCIATION OF SMALL FOUNDATIONS DBA EXPONENT PHIL 1720 N ST NW WASHINGTON DC 20036 N/A PC General & Unrestricted 250 BIDWELL TRAINING CENTER INC 1815 METROPOLITAN ST PITTSBURGH PA 15233 N/A PC General & Unrestricted 2500 BRIDGE HOUSE 5345 ARAPAHOE AVE 5 BOULDER CO 80303 N/A PC General & Unrestricted 20000 CAPITAL SISTERS INTERNATIONAL INC 227 LAMB LN GOLDEN CO 80401 N/A PC General & Unrestricted 500 CAREERWISE COLORADO 400 S COLORADO BLVD STE 700 DENVER CO 80246 N/A PC General & Unrestricted 50000 CAREERWISE COLORADO 400 S COLORADO BLVD STE 700 DENVER CO 80246 N/A PC Film Screening and Discussion Project 20000 CHALLENGE FOUNDATION INC 4545 S UNIVERSITY BLVD ENGLEWOOD CO 80113 N/A PC General & Unrestricted 2500 COLORADO THERAPEUTIC RIDING CENTER 11968 MINERAL RD LONGMONT CO 80504 N/A PC General & Unrestricted 8000 FII - NATIONAL 1203 PRESERVATION PARK WAY OAKLAND CA 94612 N/A PC General & Unrestricted 500 FII - NATIONAL 1203 PRESERVATION PARK WAY OAKLAND CA 94612 N/A PC Up Together Fund 50000 GLOBAL HUNGER PROJECT 110 W 30TH ST NEW YORK NY 10001 N/A PC General & Unrestricted 2000 I HAVE A DREAM FOUNDATION OF BOULDER COUNTY 5390 MANHATTAN CIR BOULDER CO 80303 N/A PC funding of Academic Coordinator Initiative 20000 ONE WORLD CHILDRENS FUND 3108 GLENDALE BLVD 506 LOS ANGELES CA 90039 N/A PC Empowering Youth in Cambodia Program 500 ONE WORLD CHILDRENS FUND 3108 GLENDALE BLVD 506 LOS ANGELES CA 90039 N/A PC Empowering Youth in Cambodia Program 500 PRODIGY VENTURES INC 3801 E 40TH AVE DENVER CO 80205 N/A PC General & Unrestricted 500 PROTECT OUR DEFENDERS FOUNDATION 20 PARK RD STE E BURLINGAME CA 94010 N/A PC General & Unrestricted 1000 THE CUBE CORP 3070 BLAKE ST STE 200 DENVER CO 80205 N/A PC General & Unrestricted 50000 THE NEIGHBORHOOD ACADEMY 709 N AIKEN AVE PITTSBURGH PA 15206 N/A PC General & Unrestricted 500 THORNE ECOLOGICAL INSTITUTE PO BOX 19107 BOULDER CO 80308 N/A PC Nature Kids Lafayette Program 50000 WOMEN'S FOUNDATION OF COLORADO INC 1901 E ASBURY AVE 3RD FL DENVER CO 80208 N/A PC PEP Program 1000 330250 14 1474 14 150859 18 216071 K-1 Inc/Loss 14 5408 373812 373812 false false false false false false false false false false X X 1 Mayer John A 7 Upland Drive Greenwich CT 06831 795643 X 1 BITCOIN INVT TR SHS GBTC011719, 1677 sh. 21424 2018-03-26 1 BITCOIN INVT TR SHS GBTC011719, 1629 sh. 20810 2018-03-26 1 TEXAS PACIFIC LAND TRUST TPL, 313 sh. 177250 2018-11-14 1 SPDR S&P 500 ETF TRUST SPY, 2200 sh. 576158 2018-12-10 JPMORGAN CHASE - 7.900% - 12/3 37365 46354 BROWN ADVISORY WMC JAPAN ALPHA 62956 36790 DODGE & COX FUNDS INTERNATIONA 227955 210682 DODGE & COX INCOME FUND 63607 63075 DOUBLELINE TOTAL RETURN BOND 145402 138056 FIDELITY 500 INDEX FUND 314582 287959 ISHARES CORE MSCI EAFE ETF 214501 188320 ISHARES MSCI-JAPAN 69806 55759 ISHARES TRUST MSCI EAFE INDEX 478945 485699 JPMORGAN BETABUILDERS CANADA E 127582 112845 JPMORGAN BETABUILDERS JAPAN ET 101479 94491 JPMORGAN GLOBAL RESEARCH ENHAN 410693 421889 JPMORGAN U.S. LARGE CAP CORE P 167904 153016 JPMORGAN US I&G DOMESTIC REIT 970 1000 MFS INTERNATIONAL VALUE FUND C 163503 212626 NEUBERGER BERMAN MULTI CAP OPP 164481 178292 OAKMARK INTERNATIONAL FUND 194523 186878 PARNASSUS EQUITY INCOME FUND I 114604 109100 SPDR S&P 500 ETF TRUST 2055620 2436721 VANGUARD ST BOND ETF 126622 127362 VANGUARD TOT INTL BOND IX ADMI 438339 437270 VANGUARD TOTAL BOND MARKET IND 538643 527320 JPM US RE I&G DOMESTIC LP 183578 303981 Administrative Fees 36296 36296 Foundation Dues & Memberships 675 675 K-1 Exp JPM US RE I&G DOMESTIC 5602 5602 State or Local Filing Fees 50 50 K-1 Inc/Loss JPM US RE I&G DOMESTIC LP 5408 5408 Investment Management Services 14720 14720 990-PF Estimated Tax for 2018 6000 990-PF Extension for 2017 3236