2025-11-07T07:45:07-06:00 2024-12-31 Foundation Source 3333 New Hyde Park Rd Ste 406 New Hyde Park NY 11042 990PF 2024-01-01 061331577 The Mayer-Phillips Foundation Inc % Foundation Source MAYE 8008391754 Foundation Source 501 Silverside Rd Wilmington DE 198091377 John Mayer Secretary 8008391754 2025-11-04 true true Jeffrey D Haskell P01345770 8008391754 2024 2025-03-06 01:10:19Z X 12105354 X 385639 4798 4798 217584 217584 107088 2654202 496185 715109 718567 35000 35000 3139 3139 20208 20208 2500 55153 4257 50896 116000 24465 89035 421500 421500 537500 24465 510535 177609 694102 0 131851 153103 153103 6289048 5920956 9275368 1785625 2310074 2676883 8206524 8384133 12105354 0 0 X 8206524 8384133 8206524 8384133 8206524 8384133 8206524 177609 8384133 8384133 Publicly-traded Securities 2654202 2158017 496185 496185 496185 9648 9648 9648 3291 0 6600 9891 X 0 243 243 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 424 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 9049193 106999 2682623 11838815 0 11838815 177582 11661233 583062 583062 9648 9648 573414 573414 573414 510535 0 0 0 0 510535 573414 435148 510535 435148 75387 0 0 498027 0 0 Barbara P Mayer John A Mayer X 5280 HIGH SCHOOL 1200 W MISSISSIPPI AVE DENVER CO 80223 N/A PC General & Unrestricted 50000 ACTIVATE WORK INC 1777 S HARRISON ST STE 350 DENVER CO 80210 N/A PC Charitable Event 1500 ACTIVATE WORK INC 1777 S HARRISON ST STE 350 DENVER CO 80210 N/A PC General & Unrestricted 50000 ARRUPE JESUIT HIGH SCHOOL 4343 UTICA ST DENVER CO 80212 N/A PC Corporate Work Study Program 50000 CAPITAL SISTERS INTERNATIONAL INC 601 16TH ST STE C 310 GOLDEN CO 80401 N/A PC General & Unrestricted 1000 CAREERWISE COLORADO 400 S COLORADO BLVD STE 400 DENVER CO 80246 N/A PC General & Unrestricted 50000 CHALLENGE FOUNDATION INC 4545 S UNIVERSITY BLVD ENGLEWOOD CO 80113 N/A PC General & Unrestricted 1000 CROSSPURPOSE PO BOX 2483 DENVER CO 80201 N/A PC General & Unrestricted 25000 ELEVATE NEW YORK 1407 BROADWAY 26TH FLR NEW YORK NY 10018 N/A PC General & Unrestricted 1000 FRESH START MAKING FUTURES POSSIBLE ONE STEP AT A 6107 E GRANT RD TUCSON AZ 85712 N/A PC General & Unrestricted 1000 FULLCIRCLE PROGRAM INC 1955 W BASELINE RD STE 113-431 MESA AZ 85202 N/A PC BOULDER FullCircle Program 2500 FULLCIRCLE PROGRAM INC 1955 W BASELINE RD STE 113-431 MESA AZ 85202 N/A PC Boulder FullCircle Program 5000 MEDICINE HORSE PROGRAM PO BOX 17068 BOULDER CO 80308 N/A PC General & Unrestricted 1000 MOMENTUM ADVISORY COLLECTIVE PO BOX 131618 DALLAS TX 75313 N/A PC General Operating Grant for Cafe Momentum Denver 50000 ONE WORLD CHILDRENS FUND PO BOX 849129 LOS ANGELES CA 90084 N/A PC Empowering Youth in Cambodia 5500 SCHOOLHOUSE WORLD INC 3790 EL CAMINO REAL UNIT 544 PALO ALTO CA 94306 N/A PC General & Unrestricted 75000 ST VRAIN VALLEY SCHOOL DISTRICT 395 SOUTH PRATT PKWY LONGMONT CO 80501 N/A PC General & Unrestricted 50000 THORNE ECOLOGICAL INSTITUTE PO BOX 19107 BOULDER CO 80308 N/A PC General & Unrestricted 500 WOMEN'S FOUNDATION OF COLORADO INC 1901 E ASBURY AVE 3RD FL DENVER CO 80208 N/A PC General & Unrestricted 1000 WOMENS BEAN PROJECT 1300 W ALAMEDA AVE DENVER CO 80223 N/A PC General & Unrestricted 500 421500 14 4798 14 217584 18 107088 329470 329470 false false false false false false false false false false X X 1 Mayer John A 1074 S Gilpin Street Denver CO 80209 385639 X 1 NVIDIA CORP NVDA, 120 sh. 14967 2024-06-12 1 ELI LILLY & CO LLY, 37 sh. 31928 2024-06-12 1 TEXAS PACIFIC LAND CORPORATION TPL, 105 sh. 78511 2024-06-24 1 AUTONATION INC AN, 278 sh. 44298 2024-06-24 1 QUANTA SVCS INC PWR, 46 sh. 14036 2024-11-06 1 NVIDIA CORP NVDA, 580 sh. 83651 2024-11-06 1 BROADCOM INC AVGO, 570 sh. 101508 2024-11-06 1 BROADCOM INC AVGO, 94 sh. 16740 2024-11-06 BLACKROCK HIGH YIELD BOND PORT 215364 219036 ELI LILLY & CO 31928 28564 FIDELITY 500 INDEX FUND 514796 543476 FIDELITY INTERNATL INDEX INSTL 32440 30145 GLOBAL IMPACT FUND II CLASS A 85004 74789 ISHARES CORE MSCI EAFE ETF 135034 148642 ISHARES JP MORGAN USD EM MKTS 42430 42828 ISHARES TRUST MSCI EAFE INDEX 326396 420618 JPMORGAN BETA BUILDERS EUROPE 515715 513688 JPMORGAN BETABUILDERS CANADA E 117420 169134 JPMORGAN BETABUILDERS DEVELOPE 140759 125483 JPMORGAN BETABUILDERS JAPAN ET 166911 171970 NVIDIA CORP 17307 16115 PRUDENTIAL HIGH YIELD FUND CLA 84570 86742 SPDR S&P 500 ETF TRUST 1752615 5036185 VANGUARD INTERMEDIATE TERM COR 171035 174106 VANGUARD MORTGAGE-BACKED SEC I 265473 260841 VANGUARD TOT INTL BOND IX ADMI 559339 485462 VANGUARD TOTAL BOND MARKET ETF 153141 148422 VANGUARD TOTAL BOND MARKET IND 125438 111970 VANGUARD TOTAL INTL BD IDX ETF 467841 467152 ASF VIII INFRA PRIV INVESTORS 171027 184816 CD&R FUND XII PRIVATE INVESTOR 140954 141315 GENERAL ATLANTIC INVST PARTNER 426614 452827 HPS CORE SR LENDING OFFSHORE F 131043 189907 MILLENNIUM PRIVATE INVESTORS O 396368 472418 NEA 18 PRIVATE INVESTORS OFFSH 326795 331496 ORBIMED ROYALTIES III PRVTE IN 71602 139037 PEG GLOBAL PRIVATE EQUITY VIII 276962 438508 PEG GLOBAL PRIVATE EQUITY X S. 118709 139484 RTW OFFSHORE FUND ONE, LTD 250000 187075 Administrative Fees 49911 49911 Bank Charges 4257 4257 Foundation Dues & Memberships 935 935 State or Local Filing Fees 50 50 Investment Management Services 20208 20208 We respectfully request that The Mayer-Phillips Foundation, Inc.'s quarterly estimated taxes for taxable year ending December 31, 2024 be treated as timely and request that the $88 penalty indicated on Form 2220 be abated because the underpayments in Q's 3 and 4 were due to reasonable cause. Treasury Regulations Sec 301.6651-1(c)(1) defines reasonable by asking whether the taxpayer exercised ordinary business care and prudence. The Foundation exercised care and prudence in seeking a reputable firm knowledgeable about exempt organizations to calculate its quarterly estimates for tax period ending December 31, 2024. The firm was unable to reconcile the Foundation's accounts fully in order to calculate the necessary estimated tax payment for Q's 3 and 4 based on the annualization method. The underpayment was no fault of the foundation's and the firm is enhancing its procedures to improve its reconciliation process for future quarters. We believe that the underpayment was due to reasonable cause and in no way due to an intentional disregard for the rules, and respectfully request that no 2220 penalty be assessed. 990-PF Estimated Tax for 2024 2500