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Grants paid by Halvorsen Family Foundation C/O Ole Andreas Halvorsen Trustee

EIN 06-1603158 · Stamford, CT · Form 990-PF, Part XV · NTEE T90

Halvorsen Family Foundation C/O Ole Andreas Halvorsen Trustee of Stamford, CT (EIN 06-1603158) reported 120 grants paid totaling $100,158,198 to 50 recipients in tax years 2018–2025, on Form 990-PF, Part XV. Derived from IRS e-file data, dataset version 2026.09.0, built 2026-09-03.

Grants paid

$100,158,198

120 grants

Recipients

50

distinct organizations

Tax years

2018–2025

7 filings in the corpus

By tax year

Grants by tax year, as the same figures
Tax yearGrants paidAmount paidApproved for future
20181$440,200
20207$7,115,124
20219$9,314,000
202228$13,306,826
202324$14,595,000
202418$20,884,778
202533$34,502,270

Top recipients

The 50 recipients receiving the most from Halvorsen Family Foundation C/O Ole Andreas Halvorsen Trustee, by grants paid, out of 50 distinct recipients.

Recipients ranked by total grants paid
RecipientMatchLocationGrantsTotal paidLatest year
Stanford Medical DevelopmentURedwood City, CA2$40,000,0002025
Jp Morgan Charitable FundUJenkintown, PA2$14,382,5002022
Sterling and Francine Clark Art Institute 04-2163004CWilliamstown, MA6$13,374,0002025
Memorial Sloan Kettering Cancer CenterUWest Harrison, NY2$10,250,0002025
Williams College 04-2104847BWilliamstown, MA6$5,761,5652025
Hospital for Special Surgery 13-1624135BNew York, NY1$3,000,0002021
Weill Cornell MedicineUNew York, NY2$2,250,0002025
The Hospital for Special Surgery Fund Inc 13-6714749BNew York, NY4$2,210,0002025
Green Mountain Valley School Inc 03-0235167BWaitsfield, VT3$1,605,0002025
US Ski & SnowboardUPark City, UT2$1,500,0002025
The Rockefeller University 13-1624158BNew York, NY5$1,275,0002025
Stanford University - GsbUStanford, CA1$1,000,0002020
Wildlife Conservation Society 13-1740011BBronx, NY5$1,000,0002025
Stanford University 26-4580872CStanford, CA2$540,2002025
Teachers College Columbia University 13-1624202BNew York, NY3$300,0002025
National Nordic Foundation 41-1819288BSaint Paul, MN4$145,0002025
Gunnar Sonstebys MinnefondUOslo1$139,8902020
NoramUOslo3$118,1502024
The Norway-America Association (noram)UOslo1$105,9232020
The Museum of Modern Art 13-1624100BNew York, NY2$100,0002025
Trond Bolles MinnefondUOslo1$100,0002023
MomaUManhattan, NY1$100,0002021
NensaUNew Gloucester, ME4$96,0002024
Greens Ledge Light Preservation 81-3221399CRowayton, CT3$85,0002024
Connecticut Audubon Society 06-0653531BFairfield, CT2$75,0002023
The Maritime Aquarium at Norwalk Inc 06-1062912BSouth Norwalk, CT3$60,0002025
Darien Police Association Inc 06-0947017BDarien, CT3$55,0002025
Massachusetts Museum of Contemporary Art Foundation Inc 04-3113688BNorth Adams, MA3$50,0002024
Friends of Fondation de France Inc 13-3966503BNew York, NY1$50,0002022
New England Nordic Ski Association 01-0397446DNew Gloucester, ME1$50,0002025
Darien Community Association 06-0763897BDarien, CT3$45,0002025
Stowe Volunteer Firefighters Inc 03-0324655BStowe, VT3$45,0002025
Darien Ems Post 53 Inc 06-1625224BDarien, CT2$35,0002023
Stowe Rescue Squad Inc 03-0323277BStowe, VT3$30,0002025
Darien Library Inc 06-0647010BDarien, CT3$30,0002025
Westport River Watershed Alliance 04-2604424BWestport, MA3$30,0002025
Norwegian-America AssociationUOslo1$26,4642025
National Audubon Society ConnecticutUFairfield, CT1$25,0002025
Stowe Land Trust 03-0307155BStowe, VT2$20,0002025
Darien Nature Center Inc 06-1051768BDarien, CT3$15,0002025
Aktiv Mot KreftUOslo2$14,5842025
Shetlandgruppens StiftelseUKvartermesterboligen, BERGEN1$12,7462020
Darien Emergency Medical Services - Post 53UDarien, CT1$10,0002025
Teach for America 13-3541913BNew York, NY1$10,0002025
Move Against CancerULoughborough1$7,6762022
Stowe Swimmers Foundation Ltd 03-0363251CBurlington, VT3$6,0002025
Catamount Trail Association 22-2528441BBurlington, VT3$6,0002025
Aktiv Mot Kreft (active Against Cancer)UOslo1$6,0002021
Friends of Stowe LibraryUStowe, VT3$4,5002025
Autism Services & Resources ConnecticutUWallingford, CT1$1,0002025

Match tier: A Reported EIN · B Exact name and place · C Strong name match · D Probable name match · U Unresolved. Tiers C and D are inferred, not reported; see how matching works.

Every grant

All 120 grant rows this organization reported, most recent first.

Grants reported by Halvorsen Family Foundation C/O Ole Andreas Halvorsen Trustee
Tax yearRecipientMatchAmountTypePurposeSource filing
2025Stanford Medical Development Redwood City, CAU$20,000,000paidEDUCATIONAL SUPPORT202620999349100827
2025Sterling and Francine Clark Art Institute Williamstown, MAC$5,125,000paidARTISTIC INITIATIVES202620999349100827
2025Memorial Sloan Kettering Cancer Center West Harrison, NYU$5,000,000paidMEDICAL SUPPORT202620999349100827
2025Green Mountain Valley School Waitsfield, VTB$1,500,000paidEDUCATIONAL SUPPORT202620999349100827
2025Weill Cornell Medicine New York, NYU$1,000,000paidMEDICAL SUPPORT202620999349100827
2025US Ski & Snowboard Park City, UTU$500,000paidATHLETIC OPPORTUNITIES202620999349100827
2025Wildlife Conservation Society Bronx, NYB$350,000paidWILDLIFE CONSERVATION202620999349100827
2025The Rockefeller University New York, NYB$275,000paidEDUCATIONAL SUPPORT202620999349100827
2025Williams College Williamstown, MAB$200,000paidEDUCATIONAL SUPPORT202620999349100827
2025Stanford University Stanford, CAC$100,000paidEDUCATIONAL SUPPORT202620999349100827
2025Teachers College Columbia University New York, NYB$100,000paidEDUCATIONAL SUPPORT202620999349100827
2025The Hospital for Special Surgery Fund Inc New York, NYB$50,000paidMEDICAL SUPPORT202620999349100827
2025New England Nordic Ski Association New Gloucester, MED$50,000paidATHLETIC OPPORTUNITIES202620999349100827
2025The Museum of Modern Art New York, NYB$50,000paidARTISTIC INITIATIVES202620999349100827
2025Norwegian-America Association OsloU$26,464paidGENERAL SUPPORT202620999349100827
2025National Audubon Society Connecticut Fairfield, CTU$25,000paidENVIRONMENTAL SUPPORT202620999349100827
2025Darien Police Association Darien, CTB$20,000paidCOMMUNITY SUPPORT202620999349100827
2025Stowe Volunteer Firefighters Inc Stowe, VTB$15,000paidGENERAL SUPPORT202620999349100827
2025The Maritime Aquarium at Norwalk Norwalk, CTB$15,000paidEDUCATIONAL SUPPORT202620999349100827
2025Darien Library Inc Darien, CTB$10,000paidLIBRARY SUPPORT202620999349100827
2025National Nordic Foundation Saint Paul, MNB$10,000paidATHLETIC OPPORTUNITIES202620999349100827
2025Stowe Land Trust Stowe, VTB$10,000paidENVIRONMENTAL SUPPORT202620999349100827
2025Teach for America New York, NYB$10,000paidEDUCATIONAL SUPPORT202620999349100827
2025Stowe Rescue Squad Inc Stowe, VTB$10,000paidMEDICAL SUPPORT202620999349100827
2025Westport River Watershed Alliance Westport, MAB$10,000paidENVIRONMENTAL INITIATIVES202620999349100827
2025Darien Community Association Darien, CTB$10,000paidCOMMUNITY SUPPORT202620999349100827
2025Darien Emergency Medical Services - Post 53 Darien, CTU$10,000paidMEDICAL SUPPORT202620999349100827
2025Aktiv Mot Kreft OsloU$9,806paidMEDICAL SUPPORT202620999349100827
2025Darien Nature Center Darien, CTB$5,000paidENVIRONMENTAL SUPPORT202620999349100827
2025Stowe Swimmers Foundation Stowe, VTC$2,000paidATHLETIC OPPORTUNITIES202620999349100827
2025Catamount Trail Association Burlington, VTB$2,000paidATHLETIC OPPORTUNITIES202620999349100827
2025The Friends of Stowe Library Stowe, VTU$1,000paidEDUCATIONAL SUPPORT202620999349100827
2025Autism Services & Resources Connecticut Wallingford, CTU$1,000paidMEDICAL SUPPORT202620999349100827
2024Stanford Medical Development Redwood City, CAU$20,000,000paidEDUCATIONAL SUPPORT202542479349100329
2024Williams College Williamstown, MAB$350,000paidEDUCATIONAL SUPPORT202542479349100329
2024Wildlife Conservation Society Bronx, NYB$100,000paidWILDLIFE CONSERVATION202542479349100329
2024Sterling and Francine Clark Art Institute Williamstown, MAC$100,000paidARTISTIC INITIATIVES202542479349100329
2024The Hospital for Special Surgery Fund Inc New York, NYB$60,000paidMEDICAL SUPPORT202542479349100329
2024The Rockefeller University New York, NYB$50,000paidEDUCATIONAL SUPPORT202542479349100329
2024The Museum of Modern Art New York, NYB$50,000paidARTISTIC INITIATIVES202542479349100329
2024Nensa New Gloucester, MEU$50,000paidATHLETIC OPPORTUNITIES202542479349100329
2024Noram OsloU$30,000paidGENERAL SUPPORT202542479349100329
2024Greens Ledge Light Preservation Rowayton, CTC$25,000paidPRESERVATION SUPPORT202542479349100329
2024Massachusetts Museum of Contemporary Art Foundation Inc North Adams, MAB$25,000paidARTISTIC INITIATIVES202542479349100329
2024Darien Police Association Darien, CTB$20,000paidCOMMUNITY SUPPORT202542479349100329
2024Stowe Land Trust Stowe, VTB$10,000paidENVIRONMENTAL SUPPORT202542479349100329
2024Darien Nature Center Darien, CTB$5,000paidENVIRONMENTAL SUPPORT202542479349100329
2024Aktiv Mot Kreft OsloU$4,778paidMEDICAL SUPPORT202542479349100329
2024Catamount Trail Association Burlington, VTB$2,000paidATHLETIC OPPORTUNITIES202542479349100329
2024Stowe Swimmers Foundation Stowe, VTC$2,000paidATHLETIC OPPORTUNITIES202542479349100329
2024The Friends of Stowe Library Stowe, VTU$1,000paidEDUCATIONAL SUPPORT202542479349100329
2023Sterling and Francine Clark Art Institute Williamstown, MAC$5,450,000paidARTISTIC INITIATIVES202421039349101412
2023Memorial Sloan Kettering Cancer Center West Harrison, NYU$5,250,000paidMEDICAL SUPPORT202421039349101412
2023Weill Cornell Medicine New York, NYU$1,250,000paidMEDICAL SUPPORT202421039349101412
2023US Ski & Snowboard Park City, UTU$1,000,000paidATHLETIC OPPORTUNITIES202421039349101412
2023Williams College Williamstown, MAB$550,000paidEDUCATIONAL SUPPORT202421039349101412
2023Wildlife Conservation Society Bronx, NYB$350,000paidWILDLIFE CONSERVATION202421039349101412
2023The Rockefeller University New York, NYB$150,000paidEDUCATIONAL SUPPORT202421039349101412
2023Trond Bolles Minnefond OsloU$100,000paidGENERAL SUPPORT202421039349101412
2023Teachers College Columbia University New York, NYB$100,000paidEDUCATIONAL SUPPORT202421039349101412
2023The Hospital for Special Surgery Fund Inc New York, NYB$100,000paidMEDICAL SUPPORT202421039349101412
2023Noram OsloU$60,000paidGENERAL SUPPORT202421039349101412
2023Green Mountain Valley School Inc Waitsfield, VTB$50,000paidEDUCATIONAL SUPPORT202421039349101412
2023Greens Ledge Light Preservation Rowayton, CTC$35,000paidPRESERVATION SUPPORT202421039349101412
2023The Maritime Aquarium at Norwalk Inc South Norwalk, CTB$30,000paidEDUCATIONAL SUPPORT202421039349101412
2023Connecticut Audubon Society Fairfield, CTB$25,000paidENVIRONMENTAL INITIATIVES202421039349101412
2023Stowe Volunteer Firefighters Inc Stowe, VTB$15,000paidGENERAL SUPPORT202421039349101412
2023Massachusetts Museum of Contemporary Art Foundation Inc North Adams, MAB$10,000paidARTISTIC INITIATIVES202421039349101412
2023Darien Community Association Darien, CTB$10,000paidCOMMUNITY INITIATIVES202421039349101412
2023National Nordic Foundation Saint Paul, MNB$10,000paidATHLETIC OPPORTUNITIES202421039349101412
2023Stowe Rescue Squad Inc Stowe, VTB$10,000paidMEDICAL SUPPORT202421039349101412
2023Darien Ems Post 53 Inc Darien, CTB$10,000paidMEDICAL SUPPORT202421039349101412
2023Westport River Watershed Alliance Westport, MAB$10,000paidENVIRONMENTAL INITIATIVES202421039349101412
2023Darien Library Inc Darien, CTB$10,000paidLIBRARY SUPPORT202421039349101412
2023Nensa New Gloucester, MEU$10,000paidATHLETIC OPPORTUNITIES202421039349101412
2022Jp Morgan Charitable Fund Jenkintown, PAU$9,329,500paidGENERAL SUPPORT202341079349100924
2022The Hospital for Special Surgery Fund Inc New York, NYB$2,000,000paidMEDICAL SUPPORT202341079349100924
2022The Rockefeller University New York, NYB$600,000paidEDUCATIONAL SUPPORT202341079349100924
2022Sterling and Francine Clark Art Institute Williamstown, MAC$479,000paidARTISTIC INITIATIVES202341079349100924
2022Williams College Williamstown, MAB$200,000paidEDUCATIONAL SUPPORT202341079349100924
2022National Nordic Foundation Saint Paul, MNB$100,000paidATHLETIC OPPORTUNITIES202341079349100924
2022Teachers College Columbia University New York, NYB$100,000paidEDUCATIONAL SUPPORT202341079349100924
2022Wildlife Conservation Society Bronx, NYB$100,000paidWILDLIFE CONSERVATION202341079349100924
2022Green Mountain Valley School Inc Waitsfield, VTB$55,000paidEDUCATIONAL SUPPORT202341079349100924
2022Connecticut Audubon Society Fairfield, CTB$50,000paidENVIRONMENTAL INITIATIVES202341079349100924
2022Friends of Fondation de France Inc New York, NYB$50,000paidGENERAL SUPPORT202341079349100924
2022Nensa New Gloucester, MEU$31,000paidATHLETIC OPPORTUNITIES202341079349100924
2022Noram OsloU$28,150paidGENERAL SUPPORT202341079349100924
2022Greens Ledge Light Preservation Rowayton, CTC$25,000paidPRESERVATION SUPPORT202341079349100924
2022Darien Community Association Darien, CTB$25,000paidCOMMUNITY INITIATIVES202341079349100924
2022Darien Ems Post 53 Inc Darien, CTB$25,000paidMEDICAL SUPPORT202341079349100924
2022Darien Police Association Inc Darien, CTB$15,000paidGENERAL SUPPORT202341079349100924
2022Stowe Volunteer Firefighters Inc Stowe, VTB$15,000paidGENERAL SUPPORT202341079349100924
2022Massachusetts Museum of Contemporary Art Foundation Inc North Adams, MAB$15,000paidARTISTIC INITIATIVES202341079349100924
2022The Maritime Aquarium at Norwalk Inc South Norwalk, CTB$15,000paidEDUCATIONAL SUPPORT202341079349100924
2022Darien Library Inc Darien, CTB$10,000paidLIBRARY SUPPORT202341079349100924
2022Westport River Watershed Alliance Westport, MAB$10,000paidENVIRONMENTAL INITIATIVES202341079349100924
2022Stowe Rescue Squad Inc Stowe, VTB$10,000paidMEDICAL SUPPORT202341079349100924
2022Move Against Cancer LoughboroughU$7,676paidMEDICAL SUPPORT202341079349100924
2022Darien Nature Center Inc Darien, CTB$5,000paidENVIRONMENTAL INITIATIVES202341079349100924
2022Friends of Stowe Library Stowe, VTU$2,500paidLIBRARY SUPPORT202341079349100924
2022Stowe Swimmers Foundation Ltd Burlington, VTC$2,000paidATHLETIC OPPORTUNITIES202341079349100924
2022Catamount Trail Association Burlington, VTB$2,000paidENVIRONMENTAL INITIATIVES202341079349100924
2021Jp Morgan Charitable Fund Jenkintown, PAU$5,053,000paidGENERAL SUPPORT202200769349101405
2021Hospital for Special Surgery New York, NYB$3,000,000paidMEDICAL SUPPORT202200769349101405
2021Williams College Williamstown, MAB$750,000paidEDUCATIONAL SUPPORT202200769349101405
2021Rockefeller University New York, NYB$200,000paidEDUCATIONAL SUPPORT202200769349101405
2021Moma Manhattan, NYU$100,000paidARTISTIC INITIATIVES202200769349101405
2021Wildlife Conservation Society Bronx, NYB$100,000paidWILDLIFE CONSERVATION202200769349101405
2021Sterling and Francine Clark Institute Williamstown, MAC$100,000paidARTISTIC INITIATIVES202200769349101405
2021Aktiv Mot Kreft (active Against Cancer) OsloU$6,000paidMEDICAL SUPPORT202200769349101405
2021Nensa New Gloucester, MEU$5,000paidATHLETIC OPPORTUNITIES202200769349101405
2020Williams College Williamstown, MAB$3,711,565paidEDUCATIONAL SUPPORT202102879349100945
2020Sterling and Francine Clark Institute Williamstown, MAC$2,120,000paidARTISTIC INITIATIVES202102879349100945
2020Stanford University - Gsb Stanford, CAU$1,000,000paidEDUCATIONAL SUPPORT202102879349100945
2020Gunnar Sonstebys Minnefond OsloU$139,890paidGENERAL SUPPORT202102879349100945
2020The Norway-America Association (noram) OsloU$105,923paidEDUCATIONAL SUPPORT202102879349100945
2020National Nordic Foundation St Paul, MNB$25,000paidATHLETIC OPPORTUNITIES202102879349100945
2020Shetlandgruppens Stiftelse Kvartermesterboligen, BERGENU$12,746paidGENERAL SUPPORT202102879349100945
2018Stanford University Stanford, CAC$440,200paidEDUCATIONAL SUPPORT201921559349100772

Match tier: A Reported EIN · B Exact name and place · C Strong name match · D Probable name match · U Unresolved. Tiers C and D are inferred, not reported; see how matching works.

Recipient matching for this dataset version has not yet completed its independent precision check. Tier A rows carry the EIN the filer reported; tiers B–D are the matcher's inference and should be read as leads until the check is published on the methodology page.

Source filings

Every figure above is traceable to one of these IRS e-file returns by its OBJECT_ID.

Returns this page is derived from
FormTax yearPeriod endFiledSchemaIRS OBJECT_ID
990PF20252025-11-30not stated2024v5.5202620999349100827
990PF20242024-11-30not stated2023v6.0202542479349100329
990PF20232023-11-30not stated2022v5.0202421039349101412
990PF20222022-11-30not stated2021v4.2202341079349100924
990PF20212021-11-30not stated2020v4.2202200769349101405
990PF20202020-11-30not stated2019v5.2202102879349100945
990PF20182018-11-30not stated2017v2.3201921559349100772

Derived from IRS Form 990-PF e-file XML; recipient identities from the IRS Exempt Organizations Business Master File. Dataset version 2026.09.0, built 2026-09-03. The same rows as Parquet: manifest; as JSON: /api/funders/061603158.json.

The same organization elsewhere in the program: exempt status and filing health · federal awards · grant guidance · open opportunities.

This is informational only, derived from public data on the dates shown. It is not an eligibility determination, and not legal, tax, or accounting advice. Verify against the official source before relying on it.