2026-08-18T11:55:43-05:00 2025-12-31 Foundation Source 3333 New Hyde Park Rd Ste 406 New Hyde Park NY 11042 990PF 2025-01-01 853068681 The Silseth Foundation % Foundation Source SILS 8008391754 Foundation Source 501 Silverside Rd Wilmington DE 198091377 John Silseth President 8008391754 2026-08-05 true Jeffrey D Haskell P01345770 8008391754 2025 2025-03-06 01:10:19Z X 10290485 X 868708 101 101 74439 74439 227486 1141232 779307 -1980 652 1168754 854499 0 9000 15497 147 15301 24497 147 15301 619600 619600 644097 147 634901 524657 854352 0 66594 244547 244547 5730342 6085813 9963488 56279 47512 82450 5853215 6377872 10290485 0 0 X 5853215 6377872 5853215 6377872 5853215 6377872 5853215 524657 6377872 6377872 Publicly-traded Securities 1141232 361884 779348 779348 Passthrough K1 Capital Gain/(Loss) -41 779307 11875 11875 11875 9000 0 2881 11881 X 6 0 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 Jennifer S Binversie Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, Sec 1.0 0 0 0 John M Silseth Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, Pres 2.0 0 0 0 John B Silseth Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, Treas 1.0 0 0 0 Karen K Silseth Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, VP 1.0 0 0 0 8905723 38957 0 8944680 0 8944680 134170 8810510 440526 440526 11875 11875 428651 428651 428651 634901 0 0 0 0 634901 428651 2023 2022 2021 6500 22576 178054 181501 101901 490532 634901 428651 206250 696782 0 6500 690282 22576 178054 181501 101901 206250 John M Silseth Karen K Silseth X ALDO LEOPOLD FOUNDATION INC E13701 LEVEE RD BARABOO WI 53913 N/A PC General & Unrestricted 7500 BADGER INSTITUTE INC 700 W VIRGINIA ST STE 301 MILWAUKEE WI 53204 N/A PC General & Unrestricted 7500 BILL COOK FOUNDATION 3 OAK ST GENESEO NY 14454 N/A PC General & Unrestricted 500 BROOKLINK INC 12555 W BURLEIGH RD STE 3 BROOKFIELD WI 53005 N/A PC General & Unrestricted 20000 CHARITIES AID FOUNDATION AMERICA 225 REINEKERS LN STE 375 ALEXANDRIA VA 22314 N/A PC On Call Africa Friends Fund 5000 CHRISTIAN SOLIDARITY INTERNATIONAL INC 2629 TOWNSGATE RD STE 235 WESTLAKE VLG CA 91361 N/A PC General & Unrestricted 20000 CITY LIFE CHURCH 7120 GRAND BLVD HOUSTON TX 77054 N/A PC General & Unrestricted 1000 CYSTIC FIBROSIS FOUNDATION 4550 MONTGOMERY AVE STE 1100 N BETHESDA MD 20814 N/A PC For the CLA event in Milwaukee, WI 4000 DAVIDS STAR LUTHERAN CHURCH 2740 DAVIDS STAR DR JACKSON WI 53037 N/A PC General & Unrestricted 5000 ELMBROOK CHURCH 777 S BARKER RD BROOKFIELD WI 53045 N/A PC Light & Light Eva Lawrenz fund 2500 ELMBROOK CHURCH 777 S BARKER RD BROOKFIELD WI 53045 N/A PC Harvest Fund 32000 ELMBROOK CHURCH 777 S BARKER RD BROOKFIELD WI 53045 N/A PC Harvest Fund 18000 ELMBROOK CHURCH 777 S BARKER RD BROOKFIELD WI 53045 N/A PC General & Unrestricted 184000 EVANGELICAL ALLIANCE MISSION 495 N COMMONS DR STE 151 AURORA IL 60504 N/A PC General & Unrestricted 3000 FAITH BIBLE CHURCH OF NAPLES INC 6464 IMMOKALEE RD NAPLES FL 34119 N/A PC General & Unrestricted 12000 FOOD PANTRY OF WAUKESHA COUNTY INC 1301 SENTRY DR WAUKESHA WI 53186 N/A PC General & Unrestricted 10000 GLOBAL SERVE INTERNATIONAL INC PO BOX 20367 BRADENTON FL 34204 N/A PC General & Unrestricted 10000 GOODWILL INDUSTRIES OF SOUTHEASTERN WISCONSIN INC 6055 N 91ST ST MILWAUKEE WI 53225 N/A PC General & Unrestricted 11000 HEALTHNETWORK FOUNDATION 3550 LANDER RD STE 225 PEPPER PIKE OH 44124 N/A PC General & Unrestricted 5000 HEBRON HOUSE OF HOSPITALITY FOUNDATION INC 1166 QUAIL CT STE 400 PEWAUKEE WI 53072 N/A PC General & Unrestricted 10000 HOPE CENTER INC 101 W BROADWAY WAUKESHA WI 53186 N/A PC General & Unrestricted 10100 JOHN K MACIVER INSTITUTE FOR PUBLIC POLICY INC 44 E MIFFLIN ST STE 404 MADISON WI 53703 N/A PC General & Unrestricted 5000 JOURNEYS LUTHERAN SCHOOL INC 5425 S 111TH ST HALES CORNERS WI 53130 N/A PC General & Unrestricted 10000 LOAM MEDIA INC 4057 RURAL PLAINS CIR FRANKLIN TN 37064 N/A PC General & Unrestricted 2500 LUTHER SEMINARY 2481 COMO AVE SAINT PAUL MN 55108 N/A PC General & Unrestricted 1000 LUTHERAN SOCIAL SERVICES OF WISCONSIN AND UPPER MI 6737 W WASHINGTON ST STE 227 WEST ALLIS WI 53214 N/A PC Martinus and Vera Silseth Endowment fund 6000 LUTHERAN SOCIAL SERVICES OF WISCONSIN AND UPPER MI 6737 W WASHINGTON ST STE 227 WEST ALLIS WI 53214 N/A PC To support children living on the edge in LSS's area of operation 19000 LUTHERAN WORLD RELIEF INC 700 LIGHT ST BALTIMORE MD 21230 N/A PC General & Unrestricted 1000 MASSACHUSETTS GENERAL HOSPITAL 125 NASHUA ST STE 540 BOSTON MA 02114 N/A PC Faustman Lab fund 25000 MILWAUKEE RESCUE MISSION 830 N 19TH ST MILWAUKEE WI 53233 N/A PC General & Unrestricted 15000 MT CARMEL LUTHERAN CHURCH 8424 W CENTER ST MILWAUKEE WI 53222 N/A PC General & Unrestricted 3000 PALMER MEMORIAL EPISCOPAL CHURCH 6221 MAIN ST HOUSTON TX 77030 N/A PC General & Unrestricted 500 PATHFINDERS MILWAUKEE INC 4200 N HOLTON ST STE 400 MILWAUKEE WI 53212 N/A PC General & Unrestricted 3000 PRAGER UNIVERSITY FOUNDATION 15021 VENTURA BLVD 552 SHERMAN OAKS CA 91403 N/A PC General & Unrestricted 6000 RAWHIDE INC E7475 RAWHIDE RD NEW LONDON WI 54961 N/A PC General & Unrestricted 3000 SAMARITANS PURSE PO BOX 3000 BOONE NC 28607 N/A PC General & Unrestricted 13500 SAMARITANS PURSE PO BOX 3000 BOONE NC 28607 N/A PC Support for Wisconsin flood relief 9500 SAMARITANS PURSE PO BOX 3000 BOONE NC 28607 N/A PC Texas Relief work 5000 SERENITY INNS INC 2825 W BROWN ST MILWAUKEE WI 53208 N/A PC General & Unrestricted 12000 SHARON LYNNE WILSON CENTER FOR THE ARTS INC 3270 MITCHELL PARK DR BROOKFIELD WI 53045 N/A PC General & Unrestricted 10000 SOUTHWEST FLORIDA REGIONAL COALITION TO END HOMELE 1791 TRADE CENTER WAY STE D NAPLES FL 34109 N/A PC General & Unrestricted 2000 TELLING THE TRUTH INC 12660 N AVE BROOKFIELD WI 53005 N/A PC General & Unrestricted 11000 THE SALVATION ARMY OF GREATER MILWAUKEE 11315 W WATERTOWN PLANK RD MILWAUKEE WI 53226 N/A PC General & Unrestricted 15000 THE UNIVERSITY OF TEXAS MD ANDERSON CANCER CENTER PO BOX 4486 HOUSTON TX 77210 N/A GOV General & Unrestricted 5000 THE WOMENS CENTER INC 505 N E AVE WAUKESHA WI 53186 N/A PC General & Unrestricted 5000 TURNING POINT USA INC 4940 EAST BEVERLY RD PHOENIX AZ 85044 N/A PC General & Unrestricted 5000 UNITED LUTHERAN PROGRAM FOR THE AGING INC 4545 N 92ND ST WAUWATOSA WI 53225 N/A PC General & Unrestricted 6000 WISCONSIN INMATE EDUCATION ASSOCIATION INC PO BOX 684 BROOKFIELD WI 53008 N/A PC General & Unrestricted 10000 WISCONSIN INSTITUTE FOR LAW & LIBERTY INC 330 E KILBOURN AVE STE 725 MILWAUKEE WI 53202 N/A PC General & Unrestricted 17500 WORLD RELIEF CORPORATION OF NATIONAL ASSOCIATION O PO BOX 96479 WASHINGTON DC 20077 N/A PC General & Unrestricted 15000 619600 14 101 14 74439 18 227486 K-1 Inc/Loss 525990 -2632 14 652 -2632 302678 300046 false false false false false false false false false false X X 1 Silseth John M 15815 Choctaw Trail Brookfield WI 53045 868708 X 1 Palantir Technologies Inc PLTR, 2500 sh. 281850 2025-02-10 1 Palantir Technologies Inc PLTR, 1000 sh. 123308 2025-05-05 1 Palantir Technologies Inc PLTR, 2500 sh. 463550 2025-12-29 FORM 990-PF FORM 990-PF The partnership has provided a Schedule K-3 for the tax year in which they have checked one or more of the boxes in Part I but not provided sufficient back-up information to allow the Foundation to verify why such boxes were checked or the extent to which the checking of such boxes affects any item on this return. The Foundation has prepared this return to the best of its ability and without any foreign filings for such partnership based on the information provided to it by this partnership and on the basis of having received no information to the contrary. Any missing or incomplete information is due to the Foundation's inability to obtain such information and is not a willful attempt to withhold such information. ALPHABET INC CL A 62818 156500 ALPHABET INC CL C 551233 1325805 BANK OF AMERICA CORP 29030 55000 BERKSHIRE HATHAWAY INC DEL CL 1003112 1509600 BERKSHIRE HATHAWAY INC. CLASS 235356 507677 CISCO SYSTEMS INC 45290 77030 CROWDSTRIKE HOLDINGS, INC 224018 398446 DEERE CO 204129 249080 ELI LILLY & CO 349127 806010 FASTENAL COMPANY 66625 96312 FIRST BUSINESS FINANCIAL SERVI 120360 184620 GATX CORP INC 12232 16960 JPMORGAN EQUITY PREMIUM INCO 122150 118773 KIMBERLY CLARK CORP 16160 12611 KINDER MORGAN INC 43254 82470 MCDONALD'S CORP 13454 15282 MICROSOFT CORP 1039114 1492935 MONDELEZ INTERNATIONAL INC 92919 67288 NETFLIX INC 61501 140640 PALANTIR TECHNOLOGIES INC 549865 568800 PUBLIC STORAGE INC 85704 77850 RIO TINTO PLC SPONSORED ADR 60915 80030 TESLA MOTORS INC 771432 1574019 THE COCA-COLA CO 53325 69910 UNITED PARCEL SERVICE 206100 198380 VERIZON COMMUNICATIONS 66590 81460 ENERGY TRANSFER LP 47512 82450 Administrative Fees 15236 15236 Bank Charges 25 25 K-1 Exp ENERGY TRANSFER LP 171 122 Postage/Delivery Service 40 40 State or Local Filing Fees 25 25 K-1 Inc/Loss ENERGY TRANSFER LP -1980 652 990-PF Estimated Tax for 2025 9000