2024-11-13T23:16:16-06:00 2023-12-31 Foundation Source 3333 New Hyde Park Rd Ste 406 New Hyde Park NY 11042 990PF 2023-01-01 136086299 Gustavus and Louise Pfeiffer Research Foundation % Foundation Source GUST 8008391754 Foundation Source 501 Silverside Rd Wilmington DE 198091377 sarah mccarthy treasurer 8008391754 2024-11-13 true true Jeffrey D Haskell P01345770 8008391754 2023 2024-10-15 13:58:12Z X 17863505 X 0 X 10686 10686 375685 375685 547272 547272 547272 933643 933643 38800 3880 34920 263 0 0 263 11250 0 0 11250 32873 30481 3048 27433 74496 591 76478 188163 7519 0 150344 0 0 188163 7519 0 150344 745480 926124 128437 493619 493619 113 3617 3617 15385972 17366269 17366269 15514522 17863505 17863505 76389 96868 900000 976389 96868 X 14538133 17766637 14538133 17766637 15514522 17863505 14538133 745480 2483024 17766637 17766637 Publicly-traded Securities 547272 0 547272 547272 547272 12873 12873 12873 6661 0 6600 13261 X 0 388 388 false false false false false false false true true NY true false false false false true Foundation Source 8008391754 55 WALLS DRIVE FL 3 Fairfield CT 06824 false false false false true false false false false false false false false false false false false false false false false false Kimberly Herold Alvarez Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir 1.0 6800 0 0 Lise P Chapman Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, Pres 1.0 7200 0 0 Patricia R Herold Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, AS Sec, As Trea 1.0 7200 0 0 H Robert Herold II Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, Honorary Chair 1.0 3200 0 0 Matthew Mayro Keeney Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, VP 1.0 7200 0 0 Sarah SP McCarthy Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, Sec, Treas 1.0 7200 0 0 Foundation Source 55 Walls Drive 3rd Fl Fairfield CT 06824 Administrative 67813 16298487 263668 0 16562155 0 16562155 248432 16313723 815686 815686 12873 12873 802813 150000 952813 952813 150344 0 0 0 0 150344 952813 1124332 1701080 1807348 4663416 86170 9382346 150344 150344 0 802469 802469 8579877 0 321863 8258014 1701080 1807348 4663416 86170 NONE X 14 10686 14 375685 18 547272 933643 933643 false false false false false false false false false false Audit Fees 11250 11250 H Robert Herold II * DECEASED IN 2023 VANGUARD BALANCED INDEX FUND I 5969873 5969873 VANGUARD WELLINGTON ADMIRAL FU 11396396 11396396 General Consultations 263 263 Administrative Fees 68219 67813 INSURANCE EXPENSE 3937 591 6325 Office & Supplies 381 381 Postage/Delivery Service 51 51 Registered Agent Fee 433 433 State or Local Filing Fees 911 911 Storage Fee 420 420 Website Hosting/Support 144 144 RETURNED GRANT 150000 CANCELLED GRANTS PAYABLE 900000 UNREALIZED GAINS ON INVESTMENTS 1433024 990-PF TAX FOR 2023 12873 INCREASE DEFERRED EXCISE TAX 20000