Private foundation · EIN 26-2535107 · Portsmouth, New Hampshire · Philanthropy & grantmaking

Third Street Foundation

Should you approach them?

Don't send a cold proposal. The foundation reports that it only gives to preselected organizations; an introduction through a current grantee or board member is the realistic route.

From the 2025 Form 990-PF: 30 grants paid, $124K total, median $3,000.

Accepts applications
No
per 990-PF Part XV
Grants paid, 2025
30
$124K
Median grant
$3,000
Stays in NH
—
of grants
Deadline
—
Assets
$1.3M

Grants paid in 2025

30 grants, all shown · from Form 990-PF Part XV

RecipientPurposeAmount
St Paul's SchoolConcord, MAGeneral support$16K
Boston Area GleanersActon, MAGeneral support$12K
Harvard CollegeCambridge, MAHarvard college and harvard graduate school of education$11K
Corning Museum of GlassCorning, NYGeneral support$10K
Waterfront AllianceNew York, NEGeneral support$10K
Open TableConcord, MAGeneral support$6,500
Christ Episcopal ChurchCorning, NEGeneral support$5,000
Groton Hill Music CenterGroton, MAGeneral support$5,000
Doctors Without BordersHagerstown, MDGeneral support$4,000
Equal Justice InitiativeMontgomery, ALGeneral support$4,000
Planned Parenthood Federation of AmericaNew York, NYGeneral support$4,000
World Central KitchenWashington, DCGeneral support$4,000
Partners in HealthBoston, MAGeneral support$3,000
Pine Street InnBoston, MAGeneral support$3,000
Rosie's PlaceBoston, MAGeneral support$3,000
Save the ChildrenFairfield, CTGeneral support$3,000
Unicef USANew York, NYGeneral support$3,000
Habitat for Humanity InternationalAmericus, GAGeneral support$2,000
Household Goods IncActon, MAGeneral support$2,000
Human Rights Campaign FoundationWashington, DCGeneral support$2,000
Bampa's HouseCorning, NYGeneral support$2,000
Fund for Women of the Southern TierCorning, NEGeneral support$2,000
Acton Conservation TrustActon, MAGeneral support$1,000
The Farm SchoolAthol, MAGeneral support$1,000
Acton Food Pantry IncBoston, MEGeneral support$1,000
American Red CrossBoone, IAGeneral support$1,000
Cultivate Care FarmBolton, MAGeneral support$1,000
Environmental Defense FundWashington, DCGeneral support$1,000
Southern Poverty Law CenterMontgomery, ALGeneral support$1,000
WburBoston, MAGeneral support$1,000

By state: Massachusetts 13 · New York 4 · Nebraska 3 · District of Columbia 3 · Alabama 2 · Maryland 1

About this foundation

Third Street Foundation is a private grantmaking foundation in Portsmouth, New Hampshire, administered in care of Market Street Services LLC, tax-exempt since 2009. Private foundations must pay out roughly 5% of their assets each year, mostly as grants to 501(c)(3) public charities.

All filings on ProPublica

Does Third Street Foundation accept grant applications?

No. On its 2025 Form 990-PF the foundation checked that it only makes contributions to preselected organizations. Look for an introduction through a current grantee.

How much does Third Street Foundation give each year?

In tax year 2025 it paid $124K across 30 grants, a median of $3,000.

Where does Third Street Foundation give?

Massachusetts (13 grants), New York (4 grants), Nebraska (3 grants) and elsewhere, per its latest filing.

More foundations near Portsmouth that accept applications

All in New Hampshire
FoundationBased inGrants paidMedian grantAccepts applicationsAssets
Peter and Anna Kolchinsky Foundationsince 2022 Portsmouth, NH $3.0M12 grants · 2024 $75KPreselected only $38M
Foundation for Seacoast Healthsince 1986 Portsmouth, NH $908K43 grants · 2025 $20KYes $28M
Jaffe Foundationsince 1997 Portsmouth, NH $1.2M8 grants · 2024 $57KPreselected only $27M
Ten Fingers Foundationsince 2020 Portsmouth, NH $1.1M18 grants · 2024 $10KPreselected only $23M
Stephen M Ross Foundationsince 2016 Portsmouth, NH $396K7 grants · 2024 $25KPreselected only $12M
Dorr Foundationsince 1952 Portsmouth, NH $513K1 grants · 2025 $513KYes $7.3M
Dennis a Otoole Family Foundationsince 1998 Portsmouth, NH $352K29 grants · 2025 $8,000Preselected only $7.3M
Weatherlow Foundationsince 2011 Portsmouth, NH $327K58 grants · 2025 $2,750Preselected only $4.8M
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