2016-04-28T14:25:21-05:00 2015-12-31 Foundation Source One Hollow Ln Ste 212 Lake Success NY 11042 990PF 2015-01-01 061331577 The Mayer-Phillips Foundation Inc % Foundation Source MAYE 8008391754 Foundation Source 501 Silverside Rd Wilmington DE 198091377 JOHN A MAYER secretary 8008391754 2016-04-25 true Jeffrey D Haskell P01345770 8008391754 2015 2016-09-27 15:27:22Z X 5799564 X 217232 56 56 139518 139518 262439 2487884 464315 4187 4187 623432 608076 0 12413 12413 10187 37062 5292 31770 59662 17705 31770 447500 447500 507162 17705 479270 116270 590371 273454 332214 332214 4949736 5065891 5108269 101675 51675 66170 203654 195009 292911 5528519 5644789 5799564 0 X 5528519 5644789 5528519 5644789 5528519 5644789 5528519 116270 5644789 5644789 Publicly-traded Securities 2487884 2027921 459963 459963 Passthrough K1 Capital Gain 4352 464315 false 165930 5610729 0.029574 131861 4524737 0.029142 108729 3653130 0.029763 150694 2801820 0.053784 89381 2400468 0.037235 0.179498 0.0359 5802951 208326 5904 214230 479270 X 5904 5904 5904 7600 7600 X 1696 1696 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 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 VP / Dir 1.0 0 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 5378974 219436 292911 5891321 0 5891321 88370 5802951 290148 290148 5904 5904 284244 284244 284244 479270 0 0 0 0 479270 5904 473366 284244 206777 2013 2012 2011 479270 206777 272493 0 0 11751 0 0 Barbara P Mayer John A Mayer X BIG IDEA PROJECT PO BOX 581 LITTLETON CO 80160 N/A PC General & Unrestricted 7500 CHALLENGE FOUNDATION INC 4545 S UNIVERSITY BLVD ENGLEWOOD CO 80113 N/A PC General & Unrestricted 1500 FAMILY INDEPENDENCE INITIATIVE - NATIONAL 1203 PRESERVATION PARK WAY OAKLAND CA 94612 N/A PC General & Unrestricted 250000 NO LABELS FOUNDATION 1680 WISCONSIN AVE NW 2ND FL WASHINGTON DC 20007 N/A PC General & Unrestricted 62500 ROOM TO READ 465 CALIFORNIA ST STE 1000 SAN FRANCISCO CA 94104 N/A PC literacy evaluation project 50000 ROOM TO READ 465 CALIFORNIA ST STE 1000 SAN FRANCISCO CA 94104 N/A PC literacy evaluation project 75000 WOMEN'S FOUNDATION OF COLORADO INC THE CHAMBER CTR 1901 E ASBURY AVE DENVER CO 80208 N/A PC General & Unrestricted 1000 447500 14 56 14 139518 18 262439 K-1 Inc/Loss 14 4187 406200 406200 false false false false false false false false false false X X 1 Mayer John A 7 Upland Drive Greenwich CT 06831 217232 X 1 TWITTER INC TWTR, 5413.00000000 sh. 169211 2015-10-27 1 CONOCOPHILLIPS COP, 38.00000000 sh. 2043 2015-10-26 1 DU PONT DE NEMOURS DD, 23.00000000 sh. 1386 2015-10-26 1 HONEYWELL INTL HON, 51.00000000 sh. 5252 2015-10-26 1 KIMBERLY CLARK CORP KMB, 58.00000000 sh. 7035 2015-10-26 1 MERCK & CO INC MRK, 60.00000000 sh. 3169 2015-10-26 1 PFIZER INC PFE, 218.00000000 sh. 7434 2015-10-26 1 GENERAL ELECTRIC CO GE, 78.00000000 sh. 2304 2015-10-26 1 TEXAS PACIFIC LAND TRUST TPL, 132.00000000 sh. 19398 2015-04-29 JPMORGAN CHASE - 7.900% - 12/3 51675 66170 BROWN ADVISORY WMC JAPAN ALPHA 95501 93748 DB X TRACKERS MSCI EAFE HEDGED 243388 221354 DODGE & COX FUNDS INTERNATIONA 189345 167540 DODGE & COX INCOME FUND 340892 326501 DOUBLELINE TOTAL RETURN BOND 303950 294723 ISHARES TR S & P MIDCAP 400 IN 456746 477728 ISHARES TRUST MSCI EAFE INDEX 352357 328715 JP MORGAN STRATEGIC INCOME OPP 216471 202112 JP MORGAN US LARGE CAP CORE PL 176360 182926 JPMORGAN GLOBAL RESEARCH ENHAN 530689 546770 JPMORGAN US I&G DOMESTIC REIT 970 1000 MFS INTERNATIONAL VALUE I 186000 221040 NEUBERGER BERMAN MULTI CAP OPP 186483 193145 OAKMARK INTERNATIONAL FUND CL 128409 103642 PARNASSUS EQUITY INCOME FUND I 207000 186865 SPDR S&P 500 ETF TRUST 1376859 1493349 TEXAS PACIFIC LAND TRUST 19398 17281 VANGUARD MSCI EUROPEAN ETF 55073 49830 JPM US RE I&G DOMESTIC LP 195009 292911 Administrative Fees 30170 30170 Foundation Dues & Memberships 1500 1500 K-1 Exp JPM US RE I&G DOMESTIC 5292 5292 State or Local Filing Fees 100 100 K-1 Inc/Loss JPM US RE I&G DOMESTIC Lp 4187 4187 Investment Management Services 12413 12413 990-PF Estimated Tax for 2015 7600 990-PF Extension for 2014 2587