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· Private foundation

Henry M Blackmer Foundation Inc

Its FY2025 filing reports that it funds preselected organizations and did not take unsolicited requests; check the foundation's own site before ruling it out.

$180k
Granted FY2025still arriving
12
Grants FY2025still arriving
3
States reached
$95k
Largest
01What it funds
0193% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2017 to 2025.

Environment$583kReligion$271kHealth$185kPhilanthropy$75kEducation$58kArts & Culture$38kAnimals$12kRecreation & Sports$11kOther$0
02FY2025 · 12 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2025

  • Under $10k6 grants · $26k
  • $10k–50k5 grants · $59k
  • $50k–250k1 grant · $95k
$10,000
Median grant
3
States reached
$2.3M
Total assets
Largest grants
RecipientAmount
Lowcountry Land Trust$95,000
South Carolina Environmental Law Project$19,000
Coastal Conservation League$10,000
Grace Church Cathedral$10,000
Coastal Community Foundation$10,000
Episcopal Church HomeBishop Gadsden$10,000
Southern Environmental Law Center$8,000
Cherry Hills Land Preserve$5,000
Charleston Area Therapeutic Riding$5,000
Roper St Francis Foundation$4,000
Charleston Moves$2,000
Open Space Institute$2,000
02The need
03

Does the money reach high-need areas?

Each grant placed by the hardship in its grantee’s ZIP, against the area’s typical level.

show:

Dollar for dollar, its grants (FY17–25) land where the poverty rate runs at 12%, against an area that typically sits at 13%. 14% of its dollars go to grantees based in above-average-need neighborhoods. Its grants skew toward lower-need ZIPs.

area typical 13%Academy of Mount Saint Ursula: $20k → 28%Lowcountry Land Trust: $65k → 12%South Carolina Environmental Law Project: $19k → 15%Southern Environmental Law: $10k → 8%Academy of Mount Saint Ursula: $15k → 28%Lowcountry Land Trust: $36k → 12%South Carolina Environmental Law Project: $19k → 15%Southern Environmental Law: $10k → 8%Academy of Mount Saint Ursula: $10k → 28%Lowcountry Land Trust: $35k → 12%South Carolina Environmental Law Project: $19k → 15%Southern Environmental Law: $10k → 8%Lowcountry Land Trust: $34k → 12%South Carolina Environmental Law Project: $10k → 15%Southern Environmental Law: $10k → 8%Lowcountry Land Trust: $33k → 12%South Carolina Environmental Law Project: $10k → 15%Lowcountry Land Trust: $31k → 12%South Carolina Environmental Law Project: $10k → 15%Lowcountry Land Trust: $12k → 12%South Carolina Environmental Law Project: $10k → 15%Grace Episcopal Church: $11k → 12%Grace Episcopal Church: $11k → 12%Coastal Conservation League: $10k → 12%Grace Episcopal Church: $10k → 12%Grace Church Cathedral: $10k → 12%Coastal Conservation League: $10k → 12%Lowcountry Land Trust: $10k → 12%Coastal Conservation League: $10k → 12%Coastal Conservation League: $10k → 12%Coastal Conservation League: $10k → 12%Grace Episcopal Church: $10k → 12%Coastal Conservation League: $10k → 12%Grace Episcopal Church: $10k → 12%Grace Episcopal Church: $10k → 12%Charleston Area Therapeutic Riding: $40k → 12%Charleston Area Therapeutic Riding: $33k → 12%Charleston Area Therapeutic Riding: $30k → 12%Charleston Symphony Orchestra: $13k → 12%Coastal Community Foundation: $25k → 12%Lowcountry Land Trust: $95k → 12%Episcopal Church HomeBishop Gadsden: $30k → 12%Episcopal Church HomeBishop Gadsden: $30k → 12%Episcopal Church HomeBishop Gadsden: $30k → 12%Episcopal Church HomeBishop Gadsden: $30k → 12%Episcopal Church HomeBishop Gadsden: $20k → 12%Episcopal Church HomeBishop Gadsden: $15k → 12%Episcopal Church HomeBishop Gadsden: $15k → 12%0%20%40%50%more need →
grant to an above-average-need area below average· circle size = grant amount
How this is measured
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty line in the grantee’s ZIP, averaged from the tracts in that ZIP.
How this is measured
US grants placed by each grantee’s ZIP, which can differ from where services are delivered. Need from public data (U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA), shown as context about the area, never attributed to the funder’s giving.
03Its grantees
repeat funding

Who it funds again

Organizations funded in more than one year, against those funded once.

98%of every dollar goes to organizations it has funded before.
$1.2M · 17 repeat orgs$21k to everyone else

Grantees it renews have grown median revenue +80% since the first grant, against -17% for those funded once.

17 repeat relationships: 8 still active in FY2025, 9 since wound down; 3 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

17
1

Total granted

$1.2M
$500

Median revenue growth · since first grant

+80%
-17%

Still filing today

59%
100%

New vs renewed · share of each year

In FY2025, 88% of grant dollars renewed an existing relationship; $20k went to new ones.

50%100%’17’18’19’20’21’22’23’24’25
RenewedFirst-time

Where new relationships form · theme of each grantee’s first grant

’17’18’19’20’21’22’23’24’25
EnvironmentHealthArts & CultureRecreation & SportsOther
How this is measured
First-time means a grantee’s first year in the filing window; renewed means funded in an earlier year too. The renewed share climbs naturally as a portfolio matures, so the signal is a year that bucks it (a wave of new grantees). The earliest year is left-censored: relationships that predate the data read as new. Theme is the grantee’s IRS cause.

Backed again, and grew

  • LL
    LOWCOUNTRY LAND TRUST INC
    9× · 2017–2025 · $351k · revenue +125%
  • CA
    CHARLESTON AREA THERAPEUTIC RIDING INC
    9× · 2017–2025 · $150k · revenue +1%
  • SC
    SOUTH CAROLINA ENVIRONMENTAL LAW PROJECT INC
    9× · 2017–2025 · $105k · revenue +157%

Funded once

  • LB
    LORD BERKELEY CONSERVATION TRUST
    one grant, 2019 · $500 · revenue -17%
How this is measured

Repeat means funded in two or more distinct years. Growth and survival are read from each grantee’s own subsequent IRS filings.

04Its field

Closest unfunded matches

The nonprofits that most resemble its grantees but are not funded by it, scored along the direction from the rest of the field toward the portfolio. A resemblance in what they say they do, not a recommendation.

1
North Carolina Coastal Land Trust

The organization's primary exempt purpose is acquiring and protecting lands of regional and national conservation and/or historic significance in the coastal plain of north carolina.

Environment
2
New Jersey Conservation Foundation

Recognizing that a healthy environment is critical to the well-being and survival of all living things, new jersey conservation foundation is devoted to preserving land and protecting natural resources throughout new jersey's (continued on…

Environment
3
Triangle Land Conservancy Inc

Triangle land conservancy (tlc) strives to create a healthier and more vibrant triangle region by safeguarding clean water, protecting natural habitats, supporting local farms, and connecting people with nature through land protection and…

Environment
4
South Carolina Public Interest Foundation
Crime & Legal
5
Coalition to Restore Coastal Louisiana

The mission of the coalition to restore coastal louisiana (crcl) is to unite people in action to achieve a thriving, sustainable louisiana coast for all.

Environment
6
Climate Conservation Dba Center for Large Landscape Conservation

We bring science, policy, and proven solutions directly to communities working to restore the integrity and natural connectivity of the landscapes in which they live. (see schedule o)

Environment
7
Washington Forest Law Center

Dedicated to protecting the world's natural environment on behalf of the public by serving as a public interest law firm. refer to schedule o, part iii, line 4a, for list of litigated cases or advocacy work.

—
8
Essex County Conservation Alliance

Preservation of essex county virginia's rural characteristics, its scenic lands, natural resources, and historic structures.

Environment
9
Conservation Law Foundation Inc

Conservation law foundation, inc. (clf) protects new england's environment for the benefit of all people and future generations. we use the law, science, and markets to create solutions that preserve and restore our natural resources,…

Environment
10
The South Carolina Historical Society

The schs mission is to expand, preserve, and make accessible our invaluable collection, and to encourage interest and pride in the rich history of our state.

Arts & Culture
11
Upper Savannah Land Trust

The mission of the upper savannah land trust is to encourage and support conservation of natural and scenic lands, farms, forests, waterways, and open spaces on our eight-county area: abbeville, anderson, edgefield, greenwood, laurens,…

Environment
12
Capital Region Land Conservancy Inc

To conserve and protect the natural and historic land and water resources of virginia's capital region for the benefit of current and future generations.

Environment
How this is measured
The grantee most central to the portfolio’s shape is Lowcountry Land Trust Inc; the most unlike its peers is Charleston Area Therapeutic Riding Inc. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
04the grantee network

13 grantees tracked through their own filings, 2017–2025.

Each grant beside the grantee’s revenue from every source, year by year.

How this is measured

Counted here: distinct organizations funded across 2017 to 2025, not grant rows in a single year, so this will not match the grant count on the cover. 13 of the 22 grantees resolved in that span have returns of their own we could reconcile.

Each grantee is resolved to its own IRS returns. Association, dated; never a causal claim.

0
Load-bearing (≥25% of a budget)
5
Early backer (in before they grew)
13/13
Grantees still filing
10/13
Grew since first funded

Where the money sits, by cause and then by grantee

Episcopal Church HomeBishop Gadsden: $190,000 · OtherEpiscopal Church HomeBishop GadsdenCoastal Conservation League: $85,000 · OtherCoastal Conservation LeagueGrace Episcopal Church: $81,000 · OtherGrace Episcopal ChurchIndividual grant recipient: $63,000 · OtherIndividual grant recipientACADEMY OF MOUNT SAINT URSULA: $45,000 · OtherACADEMY OF MOUNT SAINT URSULAConservation Voters of South Carolina: $24,000 · Other+6 more: $43,500 · Other+6 moreLOWCOUNTRY LAND TRUST INC: $351,000 · EnvironmentLOWCOUNTRY LAND TRUST INCSOUTH CAROLINA ENVIRONMENTAL LAW PROJECT INC: $105,000 · EnvironmentSOUTH CAROLINA ENVIRONMENTAL LAW PROJECT …+3 more: $29,000 · Environment+3 moreCHARLESTON AREA THERAPEUTIC RIDING INC: $150,000 · HealthCHARLESTON AREA…Roper St Francis Foundation: $35,000 · HealthRoper St Franci…COASTAL COMMUNITY FOUNDATION OF SOUTH CAROLINA INC: $75,000 · PhilanthropyCHARLESTON SYMPHONY ORCHESTRA: $28,000 · Arts & CultureCharleston Moves: $11,000 · Recreation & Sports
Other$531,500Environment$485,000Health$185,000Philanthropy$75,000Arts & Culture$28,000Recreation & Sports$11,000

Each grantee by its size and the funder’s share of it; top left is load-bearing

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetLOWCOUNTRY LAND TRUST INC: $351,000 over 9y, 2.6% of budgetCHARLESTON AREA THERAPEUTIC RIDING INC: $150,000 over 9y, 4.6% of budgetSOUTH CAROLINA ENVIRONMENTAL LAW PROJECT INC: $105,000 over 9y, 1.3% of budgetCOASTAL COMMUNITY FOUNDATION OF SOUTH CAROLINA INC: $75,000 over 6y, 0.1% of budgetRoper St Francis Foundation: $35,000 over 9y, 0.1% of budgetCHARLESTON SYMPHONY ORCHESTRA: $28,000 over 6y, 0.1% of budgetNATIONAL AUDUBON SOCIETY INC: $12,000 over 4y, 0.0% of budgetCharleston Moves: $11,000 over 6y, 1.0% of budgetThe Preservation Society of Charleston Inc: $10,000 over 3y, 0.1% of budgetOPEN SPACE INSTITUTE INC: $9,000 over 5y, 0.1% of budgetSOUTHERN ENVIRONMENTAL LAW CENTER: $8,000 over 1y, 0.0% of budgetCHERRY HILLS LAND PRESERVE INC: $8,000 over 2y, 2.3% of budgetLORD BERKELEY CONSERVATION TRUST: $500 over 1y, 0.1% of budget
Grantee by grantee: a decade per organization, before and after funding

A decade per grantee: revenue shaded, grants as bars, all rows on one timeline.

  • Who funds LOWCOUNTRY LAND TRUST INC ↗
  • Who funds CHARLESTON AREA THERAPEUTIC RIDING INC ↗
  • Who funds SOUTH CAROLINA ENVIRONMENTAL LAW PROJECT INC ↗
  • Who funds COASTAL COMMUNITY FOUNDATION OF SOUTH CAROLINA INC ↗
  • Who funds Roper St Francis Foundation ↗
  • Who funds CHARLESTON SYMPHONY ORCHESTRA ↗
  • Who funds NATIONAL AUDUBON SOCIETY INC ↗
  • Who funds Charleston Moves ↗
  • Who funds The Preservation Society of Charleston Inc ↗
  • Who funds OPEN SPACE INSTITUTE INC ↗
  • Who funds SOUTHERN ENVIRONMENTAL LAW CENTER ↗
  • Who funds CHERRY HILLS LAND PRESERVE INC ↗
  • Who funds LORD BERKELEY CONSERVATION TRUST ↗

Co-funders

Grantmakers whose grantees overlap with this funder’s far more than size alone predicts. Closer means stronger alignment; arcs show where they also fund each other. Here they form a tightly interlocked group: most of these funders back each other's grantees too.

Coastal Community Foundation of South Carolina IncSC21.8× affinity8 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Coastal Community Foundation of South Carolina Inc · Post and Courier Foundation · Henry & Sylvia Yaschik Foundation Inc · The Joanna Foundation · Gaylord and Dorothy Donnelley Foundation · Atlantic Services of Charleston Cha · Pathfinder Foundation Inc · Speedwell Foundation · The Ceres Foundation Inc · Dominion Energy Charitable Foundation · The Ayco Charitable Foundation · American Endowment Foundation

How this is measured
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. Overlap is association, not proof of shared intent.

How much its grantees rely on government

Each dot is one organization Henry M Blackmer Foundation Inc funds: left to right is the share of its income from government, bottom to top the share from Henry M Blackmer Foundation Inc. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 00%0%1%3%5%funder's share of their income ↑0%3%5%8%10%share of the org’s income from government →
    no gov moneyreceives it· size = income
    0get no government money at all
    3report government grants on their 990 we could not trace to a source (not plotted)
    0rely on government for over half their income
    ⤢ axis zoomed · 0–10%
    typical government reliance, FY20–25
    How this is measured
    Government income is each org’s traced federal awards (USASpending grants and contracts) plus state payments (open checkbooks) as a share of its total revenue (IRS Form 990); the self-reported government-grant line (990 line 1e) is carried for cross-check: a grantee that reports government grants we could not trace to a source is left off the chart rather than shown as receiving none. An association, not a claim that a grant caused the public funding. Coverage is precision-first, a floor rather than a census; state records exist for 9 states, so a grantee outside them shows no state figure (dimmed) rather than a false zero. Federal award amounts are obligations, which can span years, so a single-year share is indicative. 990 filings lag 12 to 24 months.
    05Through Plinth

    Warm introductions · Powered by PlinthPlus

    How do I get to Henry M Blackmer Foundation Inc?

    Find your warmest path to Henry M Blackmer Foundation Inc through trustees and officers whose names appear on both boards. Search for your organization and Plinth traces the shortest route it can evidence.

    Each link is a name appearing on two organizations’ public IRS 990 filings, matched on that name and, where the filings support it, on location. A same-state match has geographic support, which is a second matching feature rather than confirmation that the two are one person; a cross-state one is the likeliest to be two people who share a name. Every hop shows its tier, low-confidence and distant paths are held back rather than guessed, and it is worth confirming the person before you use the introduction.

    On method. Every financial figure here is read from IRS e-file XML, the funder’s own 990/990-PF, and from the multi-year returns of the 22 grantees we resolved, each linked to its source. Grantee outcomes are each organization’s own program-service reporting (Form 990, Part III), read as association with funding, never as caused by it. Low-confidence name matches are suppressed rather than guessed. How we build these →

    How this is measured
    Each figure carries one of six labels. Filed is what the funder reported on its return. Official is another government record about an organization, such as a federal award or a charity register, joined by name where no shared identifier exists. Resolved is an identity we worked out where the filing named a recipient without an EIN, kept only above a measured confidence threshold. Computed is arithmetic over those, like themes, portfolio clusters and co-funder strength. Context is a statistic about a place rather than about an organization, which is what the need overlay is: it describes the area a grantee’s address sits in, not where its work lands. Inferred is drawn by a model from text, like the partnerships read out of public news and organization websites. Each is labeled where it appears.

    Generated from the IRS Form 990-PF e-file return for fiscal year 2025, released 2025. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

    Source object · view filing

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