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Nonprofit · EIN 46-4274950

THORNE COX FAMILY FOUNDATION

Tax-exempt · BOSTON, MA 02110

Financials

$877K$787K2023$573K$656K2024
Revenue Expenses · by fiscal year end
Financials of THORNE COX FAMILY FOUNDATION by year, from its e-filed returns
Year endedFormRevenueExpensesNet incomeTotal assetsLiabilitiesNet assets
December 31, 2024990-PF$572,654$655,528-$82,874$4,293,422$0$4,293,422
December 31, 2023990-PF$877,368$786,791$90,577$3,992,700$0$3,992,700
Financial details: 990-PF for the year ended December 31, 2024

Revenue

Dividends
$69,189
Net gain from sales of assets
$381,510
Other income
$121,955

Expenses

Grants and similar amounts paid
$572,149
Compensation of officers, directors and key employees
$0
Disbursements for charitable purposes
$572,414
Excise tax on investment income
$12,077

Balance sheet and other

Total assets, start of year
$3,992,700
Total assets, end of year
$4,293,422
Total liabilities, end of year
$0
Net assets, end of year
$4,293,422
Fair market value of assets
$4,293,422
Qualifying distributions
$572,414
Net investment income
$940,452

From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.

Officers, directors and key employees

As listed on the 990-PF for the year ended December 31, 2024, highest compensation first.

NameTitleHours / weekCompensation
Brinkley Thorne
356 Worth Avenue Apt B-2, Palm Beach, FL 33480
President1$0
Mazie L Cox
356 Worth Avenue Apt B-2, Palm Beach, FL 33480
Vice President1$0
Yarrow Thorne
1219 N Main Road, Jamestowm, RI 028352217
Secretary1$0
Dune Thorne
C/O Brown Advisory 100 High St 27th, Floor, Boston, MA 02110
Treasurer1$0
990-PF for the year ended December 31, 2023: 4 people
NameTitleHours / weekCompensation
Brinkley Thorne
356 Worth Avenue Apt B-2, Palm Beach, FL 33480
President1$0
Mazie L Cox
356 Worth Avenue Apt B-2, Palm Beach, FL 33480
Vice President1$0
Yarrow Thorne
1219 N Main Road, Jamestowm, RI 028352217
Secretary1$0
Dune Thorne
C/O Brown Advisory 100 High St 27th, Floor, Boston, MA 02110
Treasurer1$0

Address and contacts

Address (IRS master file)
100 HIGH STREET 27TH FLOOR, BOSTON, MA 02110-2321
In care of
% BROWN ADVISORY
Signed the 990-PF
Dune Thorne, Treasurer
Phone
(617) 717-6373
Return prepared by
Berry Dunn McNeil & Parker LLC

What it must file and when

IRS records say it files Form 990-PF. Private foundations file every year. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.

Tax yearYear endedDueIRS public records
2025December 31, 2025May 15, 2026Not on file
2024December 31, 2024May 15, 2025990-PF on file
2023December 31, 2023May 15, 2024990-PF on file

IRS record

EIN
46-4274950
Tax-exempt status
501(c)(3): Charitable, religious, educational or scientific organization
Foundation status
Private non-operating foundation
Donations deductible (Pub 78)
Private foundation, 30% limit
Exempt since
2014
Accounting year ends
December
Files
Form 990-PF
Assets (IRS master file)
$4,293,422
Income (IRS master file)
$1,282,396

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-PFDecember 2024$572,654$655,528$4,293,422IRS
990-TDecember 2024–––IRS
990-PFDecember 2023$877,368$786,791$3,992,700XML
990-TDecember 2023–––IRS
990-PFDecember 2022–––IRS
990-TDecember 2022–––IRS
990-PFDecember 2021–––IRS
990-TDecember 2021–––IRS
990-PFDecember 2020–––IRS
990-TDecember 2020–––IRS

990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 46-4274950).

Questions about THORNE COX FAMILY FOUNDATION

What is the EIN of THORNE COX FAMILY FOUNDATION?
The employer identification number (EIN) of THORNE COX FAMILY FOUNDATION is 46-4274950.
Is THORNE COX FAMILY FOUNDATION tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2014.
Are donations to THORNE COX FAMILY FOUNDATION tax-deductible?
Yes. It is listed in IRS Publication 78 (Private foundation, 30% limit).
Which annual return does THORNE COX FAMILY FOUNDATION file?
Form 990-PF. Private foundations file every year.
When is the next return of THORNE COX FAMILY FOUNDATION due?
The return for tax year 2025 (the year ending December 31, 2025) is due May 15, 2026. Form 8868 extends it by six months; the 990-N cannot be extended.
When did THORNE COX FAMILY FOUNDATION last file with the IRS?
The latest return in the IRS public files is the 990-PF for the year ended December 2024.
Who are the officers and directors of THORNE COX FAMILY FOUNDATION?
The 990-PF for the year ended December 31, 2024 lists 4 people; 0 received compensation from the organization.
How much revenue does THORNE COX FAMILY FOUNDATION have?
On its 990-PF for the year ended December 31, 2024 it reported revenue of $572,654, expenses of $655,528 and total assets of $4,293,422 at year end.

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