STRATEGY STUDIO / PUBLIC DATA EXPLORER

GIGI & AVERELL H MORTIMER FOUNDATION

Cite this

Plain text GIGI & AVERELL H MORTIMER FOUNDATION. Strategy Studio, nonprofit organization profile, tax years 2017–2025. https://strategystudio.org/org/464323935. Retrieved 2026-10-19.

APA Strategy Studio. (n.d.). GIGI & AVERELL H MORTIMER FOUNDATION [Nonprofit organization profile; tax years 2017–2025]. Retrieved October 19, 2026, from https://strategystudio.org/org/464323935

MLA “GIGI & AVERELL H MORTIMER FOUNDATION.” Strategy Studio, tax years 2017–2025, https://strategystudio.org/org/464323935. Accessed 19 Oct. 2026.

Retrieved 2026-10-19; covers tax years 2017–2025. Data: Strategy Studio, CC BY 4.0.

2025 · Form 990PF · revenue $599K · expenses $63K · assets $2.0M

EIN
46-4323935
Address
PO BOX 1022, HARRIMAN, NY 10926-1022
NTEE code
T99
Subsection
501(c)(3)
Ruling year
2014
Cross-check
ProPublica Nonprofit Explorer

Each tax year counts once: when a return was amended, only the latest return for that period is used below (superseded returns stay listed, greyed, under Finances).

People paid by the organization

None of the 4 people listed on these returns reported compensation from the organization. They are listed below.

Officers and directors, no compensation reported

4 people listed on the returns with $0 (or no amount) in every compensation column: current people first. Hours are as filed on the latest return each person appears on.

NameLatest titleYearsHrs/wk (latest)CompensationOrganizations
Jean M Mortimer CHAIRMAN2017-2025 0 $0 reported 1
Averell H Mortimer PRESIDENT/TREASURER2017-2025 0 $0 reported 1
Maxwell H Mortimer SECRETARY2017-2025 0 $0 reported 1
Hume R Steyer ASSISTANT SECRETARY2017-2025 0 $0 reported 1

People by year

2025 · 4 people listed · none paid
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
JEAN M MORTIMER CHAIRMAN0 $0-$0 $01
AVERELL H MORTIMER PRESIDENT/TREASURER0 $0-$0 $01
MAXWELL H MORTIMER SECRETARY0 $0-$0 $01
HUME R STEYER ASSISTANT SECRETARY0 $0-$0 $01
2024 · 4 people listed · none paid
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
JEAN M MORTIMER CHAIRMAN0 $0-$0 $01
AVERELL H MORTIMER PRESIDENT/TREASURER0 $0-$0 $01
MAXWELL H MORTIMER SECRETARY0 $0-$0 $01
HUME R STEYER ASSISTANT SECRETARY0 $0-$0 $01
2023 · 4 people listed · none paid
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
JEAN M MORTIMER CHAIRMAN0 $0-$0 $01
AVERELL H MORTIMER PRESIDENT/TREASURER0 $0-$0 $01
MAXWELL H MORTIMER SECRETARY0 $0-$0 $01
HUME R STEYER ASSISTANT SECRETARY0 $0-$0 $01
2022 · 4 people listed · none paid
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
JEAN M MORTIMER CHAIRMAN0 $0-$0 $01
AVERELL H MORTIMER PRESIDENT/TREASURER0 $0-$0 $01
MAXWELL H MORTIMER SECRETARY0 $0-$0 $01
HUME R STEYER ASSISTANT SECRETARY0 $0-$0 $01
2021 · 4 people listed · none paid
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
JEAN M MORTIMER CHAIRMAN0 $0-$0 $01
AVERELL H MORTIMER PRESIDENT/TREASURER0 $0-$0 $01
MAXWELL H MORTIMER SECRETARY0 $0-$0 $01
HUME R STEYER ASSISTANT SECRETARY0 $0-$0 $01
2020 · 4 people listed · none paid
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
JEAN M MORTIMER CHAIRMAN0 $0-$0 $01
AVERELL H MORTIMER PRESIDENT/TREASURER0 $0-$0 $01
MAXWELL H MORTIMER SECRETARY0 $0-$0 $01
HUME R STEYER ASSISTANT SECRETARY0 $0-$0 $01
2019 · 4 people listed · none paid
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
JEAN M MORTIMER CHAIRMAN0 $0-$0 $01
AVERELL H MORTIMER PRESIDENT/TREASURER0 $0-$0 $01
MAXWELL H MORTIMER SECRETARY0 $0-$0 $01
HUME R STEYER ASSISTANT SECRETARY0 $0-$0 $01
2018 · 4 people listed · none paid
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
JEAN M MORTIMER CHAIRMAN0 $0-$0 $01
AVERELL H MORTIMER PRESIDENT/TREASURER0 $0-$0 $01
MAXWELL H MORTIMER SECRETARY0 $0-$0 $01
HUME R STEYER ASSISTANT SECRETARY0 $0-$0 $01
2017 · 4 people listed · none paid
NameTitleHrs/wkFrom orgFrom relatedOtherTotalOrgs
JEAN M MORTIMER CHAIRMAN0 $0-$0 $01
AVERELL H MORTIMER PRESIDENT/TREASURER0 $0-$0 $01
MAXWELL H MORTIMER SECRETARY0 $0-$0 $01
HUME R STEYER ASSISTANT SECRETARY0 $0-$0 $01

Highest-paid independent contractors

No independent contractors reported.

Who the money went to

Grants this organization reported paying: Schedule I Part II of the Form 990, or the grants-paid list on the 990-PF. Open a year for every recipient. Recipients link to their own page when the grant names an EIN we have (990-PF grants list no EIN, so those link only on an exact, unique name and state). Grants to individuals are counted; their names are not shown.

2025 · 10 grants to organizations · $60K
2019 · 1 grant to organizations · $3K
2018 · 6 grants to organizations · $110K
2017 · 4 grants to organizations · $215K

Negative amounts are returned or refunded grants; they are listed last and left out of the totals of grants paid.

Who gave

Contributors listed on Schedule B of the Form 990-PF: name, city and state as filed (street addresses are not shown), with total and noncash contributions for the year. A link to an organization's page is tagged Fuzzy with its name-similarity score (0 to 1) when it rests on name and state; Schedule B lists no EIN, so no link here is an exact identifier match.

2025 · 1 contributor · $370K
#ContributorTypeCity, stateTotalNoncashSource
1 A MORTIMER GRANTOR - M FAMILY 20 Person HARRIMAN, NY $370,019- Form 990PF Sch. B, 2025 · filing
2024 · 1 contributor · $308K
#ContributorTypeCity, stateTotalNoncashSource
1 A MORTIMER GRANTOR - M FAMILY 20 Person HARRIMAN, NY $308,349- Form 990PF Sch. B, 2024 · filing
2023 · 1 contributor · $257K
#ContributorTypeCity, stateTotalNoncashSource
1 A MORTIMER GRANTOR - M FAMILY 20 Person HARRIMAN, NY $256,958- Form 990PF Sch. B, 2023 · filing
2022 · 1 contributor · $214K
#ContributorTypeCity, stateTotalNoncashSource
1 A MORTIMER GRANTOR - M FAMILY 20 Person HARRIMAN, NY $214,131- Form 990PF Sch. B, 2022 · filing
2021 · 1 contributor · $178K
#ContributorTypeCity, stateTotalNoncashSource
1 A MORTIMER GRANTOR - M FAMILY 20 Person HARRIMAN, NY $178,442- Form 990PF Sch. B, 2021 · filing
2020 · 1 contributor · $149K
#ContributorTypeCity, stateTotalNoncashSource
1 A MORTIMER GRANTOR - M FAMILY 20 Person HARRIMAN, NY $148,702- Form 990PF Sch. B, 2020 · filing
2019 · 1 contributor · $124K
#ContributorTypeCity, stateTotalNoncashSource
1 A MORTIMER GRANTOR - M FAMILY 20 Person Harriman, NY $123,918- Form 990PF Sch. B, 2019 · filing
2018 · 1 contributor · $103K
#ContributorTypeCity, stateTotalNoncashSource
1 A MORTIMER GRANTOR - M FAMILY 20 Person Harriman, NY $103,265- Form 990PF Sch. B, 2018 · filing
2017 · 2 contributors · $186K
#ContributorTypeCity, stateTotalNoncashSource
2 Averell H and Gigi Mortimer Person HARRIMAN, NY $100,000- Form 990PF Sch. B, 2017 · filing
1 A MORTIMER GRANTOR - M FAMILY 20 Person Harriman, NY $86,054- Form 990PF Sch. B, 2017 · filing

Contributors listed here are as reported on the filing. Unusual is not the same as improper. Many of these patterns have ordinary explanations. Check the filing.

Finances

Newest first. Each filing: its name on one row, its figures on the row beneath. Greyed filings are superseded by a later return for the same period and are left out everywhere else on this page.

RevenueExpensesAssetsNet assetsContributionsProgram revenueOfficer payEmployeesVolunteers
2025 · Form 990PF period ending 2025-12-31 · view filing · original 990 ↗
$598,505$62,688 $1,967,495$1,967,437 $370,019- $0--
2024 · Form 990PF period ending 2024-12-31 · view filing · original 990 ↗
$516,046$4,692 $1,431,678$1,431,620 $308,349- $0--
2023 · Form 990PF period ending 2023-12-31 · view filing · original 990 ↗
$359,058$4,240 $920,324$920,266 $256,958- $0--
2022 · Form 990PF period ending 2022-12-31 · view filing · original 990 ↗
$103,432$3,340 $565,506$565,448 $214,131- $0--
2021 · Form 990PF period ending 2021-12-31 · view filing · original 990 ↗
$163,494$1,884 $465,414$465,356 $178,442- $0--
2020 · Form 990PF period ending 2020-12-31 · view filing · original 990 ↗
$181,074$1,709 $303,804$303,804 $148,702- $0--
2019 · Form 990PF period ending 2019-12-31 · view filing · original 990 ↗
$123,922$3,957 $123,778$123,778 $123,918- $0--
2018 · Form 990PF period ending 2018-12-31 · view filing · original 990 ↗
$103,281$113,402 $3,812$3,812 $103,265- $0--
2017 · Form 990PF period ending 2017-12-31 · view filing · original 990 ↗
$186,093$217,441 $13,933$13,933 $186,054- $0--

Funders of this organization

Not reported: no grants to this organization appear in the filings we have (tax years 2010 to 2025).

Similar organizations

Ranked without any AI: same NTEE code first, then the same NTEE group; then revenue within 2x, 5x or 10x; then the same state; then similar name and mission text. Same state only · More (100)

OrganizationStateNTEELatest revenueLatest expensesTop-paid titleTop payWhy similar
PBG FOUNDATIONNYT99 $1,148,387$345,872 TRUSTEE$0 Same NTEE code T99, revenue within 2x, same state
GPYN FOUNDATION INCNYT99 $325,797$338,850 PRESIDENT$60,000 Same NTEE code T99, revenue within 2x, same state
REMA HORT MANN FOUNDATION INCNYT99 $644,402$854,108 EXECUTIVE DIRECTOR$0 Same NTEE code T99, revenue within 2x, same state
J&G FAMILY FOUNDATIONNYT99 $353,000$352,836 TRUSTEE$0 Same NTEE code T99, revenue within 2x, same state
JCK FOUNDATION INCNYT99 $739,195$490,966 PRESIDENT$0 Same NTEE code T99, revenue within 2x, same state
WCA FOUNDATION INCNYT99 $1,158,629$902,000 EXECUTIVE DIRECTOR$96,441 Same NTEE code T99, revenue within 2x, same state
AMPLITUDE FOUNDATION TRNYT99 $1,018,683$1,000,000 TRUSTEE$0 Same NTEE code T99, revenue within 2x, same state
THE MANZANITA FOUNDATIONNYT99 $480,450$267,695 INTERIM PRESIDENT$0 Same NTEE code T99, revenue within 2x, same state
DANIELLE ANTAR FOUNDATION INCNYT99 $329,457$306,674 DIRECTOR$0 Same NTEE code T99, revenue within 2x, same state
EARTHSENSE FOUNDATIONNYT99 $691,306$479,855 PRESIDENT$0 Same NTEE code T99, revenue within 2x, same state
DITMARS FOUNDATION INCNYT99 $998,500$992,799 PRESIDENT$0 Same NTEE code T99, revenue within 2x, same state
MARGOT MARSH BIODIVERSITY FOUNDATIONNYT99 $466,312$566,801 DIRECTOR$40,000 Same NTEE code T99, revenue within 2x, same state
PAINTED FLOWER FOUNDATION INCNYT99 $604,114$214,410 PRESIDENT$0 Same NTEE code T99, revenue within 2x, same state
BUSINESS FOR GOOD FOUNDATION INCNYT99 $893,883$1,433,976 PRESIDENT$0 Same NTEE code T99, revenue within 2x, same state
CAMP SMILE FOUNDATION INCNYT99 $344,666$367,499 Treasurer$0 Same NTEE code T99, revenue within 2x, same state
THE POTTERS HANDS FOUNDATION INCNYT99 $450,977$525,963 EXECUTIVE DIRECTORBOARD CHAIR$85,748 Same NTEE code T99, revenue within 2x, same state
BETTINA BARUCH FOUNDATION INCNYT99 $466,946$251,688 TRUSTEE$3,000 Same NTEE code T99, revenue within 2x, same state
JOHN AND JAIME NEARY FAMILY FOUNDATION INCNYT99 $826,446$21,541 Director$0 Same NTEE code T99, revenue within 2x, same state
BRENT R NICKLAS FOUNDATION INCNYT99 $495,675$263,301 DIRECTOR AND CEO$0 Same NTEE code T99, revenue within 2x, same state
ROBBINS FAMILY CHARITABLE FOUNDATIONNYT99 $785,643$751,525 DIR/TREAS/SEC$0 Same NTEE code T99, revenue within 2x, same state
THE GOULD-SHENFELD FAMILY FOUNDATION OF NEW YORKNYT99 $708,547$933,358 TRUSTEE$0 Same NTEE code T99, revenue within 2x, same state
ROBERT AM STERN FAMILY FOUNDATION FOR ADVANCEMENT OF ARCHITECTURAL CNYT99 $1,063,023$629,726 PRESIDENT (THRU 11/27/25)$0 Same NTEE code T99, revenue within 2x, same state
NATION FUND FOR INDEPENDENT JOURNALISM INCNYT99 $981,533$931,846 Executive Dir.$0 Same NTEE code T99, revenue within 2x, same state
BLACK RIVER ENVIRONMENTAL IMPROVEMENT ASSOCIATION INCNYT99 $456,543$432,496 ASSISTANT CONTROLLER$6,580 Same NTEE code T99, revenue within 2x, same state
SEVENTH DISTRICT ASSOCIATION INCNYT99 $734,203$477,278 PRESIDENT$0 Same NTEE code T99, revenue within 2x, same state

Who funds organizations like this

Grantors that funded the 100 most similar organizations. Ranked by total given to them. Foundations (990-PF) and donor-advised fund sponsors only. Same matching as Funders above (by EIN, or by name for foundations).

GrantorTypeTotal givenGrantsOrganizations fundedYearsWhich ones
TULL FAM FOUNDATION Private foundation$3,500,0003 12022–2024 USA BASKETBALL FOUNDATION
BLACK RIVER OUTDOOR EDUCATION PROGRAM I Private foundation$2,533,3041 12019–2019 BLACK RIVER ENVIRONMENTAL IMPROVEMENT ASSOCIATION INC
FIDELITY INVESTMENTS CHARITABLE GIFT FUND DAF sponsor$1,697,30541 162016–2024 MULTIPLYING GOOD INC; NATION FUND FOR INDEPENDENT JOURNALISM INC; LAS VEGAS ACES FOUNDATION; WELLSKY FOUNDATION and 12 more
DONOR ADVISED CHARITABLE GIVING DAF sponsor$1,142,98629 112014–2024 MULTIPLYING GOOD INC; TAHOE MARITIME FOUNDATION; FOREST HIGHLANDS FOUNDATION; THRIVE FOUNDATION and 7 more
BUTLER CONSERVATION FUND INC Private foundation$839,0505 12011–2023 BLACK RIVER ENVIRONMENTAL IMPROVEMENT ASSOCIATION INC
DANE G HANSEN FOUNDATION Private foundation$708,91811 12020–2025 CITIZENS FOUNDATION
EPKER-SINHA FOUNDATION Private foundation$670,0009 12017–2025 FOREST HIGHLANDS FOUNDATION
HEINZ FAMILY FOUNDATION Private foundation$530,0003 12022–2023 MULTIPLYING GOOD INC
JEAN & LEWIS WOLFF FAMILY Private foundation$456,1212 12020–2020 MATTHEW SILVERMAN MEMORIAL FOUNDATION
ARIZONA COMMUNITY FOUNDATION DAF sponsor$422,1572 12023–2024 FOREST HIGHLANDS FOUNDATION
PUFFIN FOUNDATION LTD Private foundation$400,0003 12022–2024 NATION FUND FOR INDEPENDENT JOURNALISM INC
NATIONAL PHILANTHROPIC TR DAF sponsor$347,50011 22014–2024 MULTIPLYING GOOD INC; MATTHEW SILVERMAN MEMORIAL FOUNDATION
FORGOOD INC DAF sponsor$346,16612 32014–2024 MULTIPLYING GOOD INC; ROCKY MOUNTAIN FISHER HOUSE FOUNDATION; NISHTAR ALUMNI OF NORTH AMERICA - NANA
VANGUARD CHARITABLE ENDOWMENT PROGRAM DAF sponsor$344,0008 42020–2024 NATION FUND FOR INDEPENDENT JOURNALISM INC; NISHTAR ALUMNI OF NORTH AMERICA - NANA; WCA FOUNDATION INC; MULTIPLYING GOOD INC
GS DONOR ADVISED PHILANTHROPY FUND FOR WEALTH MANAGEMENT INC DAF sponsor$305,0007 32019–2024 MULTIPLYING GOOD INC; WCA FOUNDATION INC; MATTHEW SILVERMAN MEMORIAL FOUNDATION

The full list · all similar organizations

Where the money went

Every expense line on each return, biggest first: Form 990 Part IX (with its program, management and fundraising columns), 990-EZ Part I, or 990-PF Part I. Event marks lines the organization itself describes as events. “Events” in each summary adds those lines, conferences and meetings, and the direct costs of fundraising events. Unusual is not the same as improper. Many of these patterns have ordinary explanations. Check the filing.

2025 · Form 990PF · $62,688 spent · pay $0 · grants $60,000 · events $0
LineAs describedTotalShare
Contributions, gifts, grants paid $60,000 95.7%
Fees: other professional $1,787 2.9%
Other expenses $638 1.0%
Taxes $263 0.4%
Total$62,688100%

View the filing

2024 · Form 990PF · $4,692 spent · pay $0 · grants $0 · events $0
LineAs describedTotalShare
Fees: accounting $2,600 55.4%
Fees: other professional $1,646 35.1%
Other expenses $284 6.1%
Taxes $162 3.5%
Total$4,692100%

View the filing

2023 · Form 990PF · $4,240 spent · pay $0 · grants $0 · events $0
LineAs describedTotalShare
Fees: accounting $2,475 58.4%
Fees: other professional $1,211 28.6%
Other expenses $490 11.6%
Taxes $64 1.5%
Total$4,240100%

View the filing

2022 · Form 990PF · $3,340 spent · pay $0 · grants $0 · events $0
LineAs describedTotalShare
Fees: accounting $1,500 44.9%
Fees: other professional $1,174 35.1%
Other expenses $583 17.5%
Taxes $83 2.5%
Total$3,340100%

View the filing

2021 · Form 990PF · $1,884 spent · pay $0 · grants $0 · events $0
LineAs describedTotalShare
Fees: accounting $1,500 79.6%
Other expenses $341 18.1%
Taxes $43 2.3%
Total$1,884100%

View the filing

2020 · Form 990PF · $1,709 spent · pay $0 · grants $0 · events $0
LineAs describedTotalShare
Fees: accounting $1,558 91.2%
Other expenses $151 8.8%
Total$1,709100%

View the filing

2019 · Form 990PF · $3,957 spent · pay $0 · grants $3,000 · events $0
LineAs describedTotalShare
Contributions, gifts, grants paid $3,000 75.8%
Fees: accounting $694 17.5%
Other expenses $263 6.6%
Total$3,957100%

View the filing

2018 · Form 990PF · $113,402 spent · pay $0 · grants $110,350 · events $0
LineAs describedTotalShare
Contributions, gifts, grants paid $110,350 97.3%
Fees: accounting $2,693 2.4%
Other expenses $359 0.3%
Total$113,402100%

View the filing

2017 · Form 990PF · $217,441 spent · pay $0 · grants $215,000 · events $0
LineAs describedTotalShare
Contributions, gifts, grants paid $215,000 98.9%
Fees: accounting $2,000 0.9%
Other expenses $440 0.2%
Taxes $1 0.0%
Total$217,441100%

View the filing