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Pennsylvania · Private foundation

Martha Mack Lewis Foundation

Its FY2025 filing reports that it accepted unsolicited grant applications.

$60k
Granted FY2025(still arriving)
8
Grants FY2025
7
Organizations funded FY2024
29%
First-time grantees FY2024
Read the full brief
Median grant, FY2025
$5,000
Largest grant, FY2025
$25,000
Organizations funded a year
6 to 10
FY2018 to FY2024
States reached, FY2025
1
Total assets, FY2025
$1.0M
Applications
Takes unsolicited applications
Per its most recent filing; check its own site

How open it is to new grantees

In FY2024, 29% of the organizations Martha Mack Lewis Foundation funded were first-time grantees, receiving 13% of its grant dollars.

New vs renewed · share of each year

In FY2024, 87% of grant dollars renewed an existing relationship; $6k went to new ones.

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

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

’18’19’20’21’22’23’24
Arts & CultureEducationHuman ServicesHealthOther
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.
The numbers by year
Fiscal yearOrganizations fundedTo those organizationsFirst-time grantees
FY2025still arriving8$60k13%
FY20247$43k29%
FY202310$60k30%
FY20229$61k11%
FY20216$53k17%
FY20206$54k50%
FY20196$56k50%
FY20186$56k83%
100% classified

What it funded, over time

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

Arts & Culture$207kEducation$126kHuman Services$69kYouth Development$26kHousing & Shelter$20kScience & Tech$20kAnimals$18kReligion$5kOther$0

Top grantees

Largest recipients by total granted, FY2017 to FY2025, and the share of each one’s budget the grants supplied at peak.

Show all 20 grantees

What it could do for these grantees

Plus 6 recipients with no EIN on record ($56k), not named here.

Where it is load-bearing

Each grantee by its size and the share of its budget Martha Mack Lewis Foundation supplied at peak.

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetCarnegie Institute: $80,000 over 4y, 0.0% of budgetThe Kiski School: $65,000 over 3y, 0.2% of budgetGettysburg Foundation: $38,500 over 5y, 0.1% of budgetPittsburgh Opera Inc: $33,000 over 5y, 0.1% of budgetPittsburgh Symphony Inc: $32,000 over 4y, 0.0% of budgetThe Children's Home of Pittsburgh: $30,500 over 4y, 0.1% of budgetGrier Foundation: $30,000 over 2y, 0.3% of budgetPittsburgh Youth Leadership: $26,000 over 6y, 4.3% of budgetCanine Companions for Independence Inc: $18,000 over 4y, 0.0% of budgetFolds of Honor Eastern-Pa-Nj-Chapter: $15,500 over 3y, 1.2% of budgetChautauqua Institution: $10,000 over 1y, 0.0% of budgetRonald McDonald House Global: $10,000 over 2y, 0.0% of budgetFolds of Honor Western Pa: $10,000 over 2y, 1.4% of budgetPittsburgh Ballet Theatre Inc: $8,500 over 2y, 0.1% of budgetChildren's Museum of Pittsburgh: $6,000 over 1y, 0.0% of budgetFort Ligonier Association: $6,000 over 1y, 0.4% of budgetHistorical Society of Western Pennsylvania: $5,500 over 1y, 0.1% of budgetStephen Siller Tunnel to Towers Foundation: $5,500 over 1y, 0.0% of budgetOff the Floor Pittsburgh: $2,500 over 1y, 0.1% of budget

Tap a dot to name the grantee.

How this is measured
Share of budget is the funder’s grant in a year over the grantee’s total revenue that year, at its highest across the years we hold; revenue is from all sources. Only grantees confirmed against their own filings, whose grants do not exceed their revenue, are plotted: the largest 19.

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.

Richard King Mellon FoundationPA23.9× affinity9 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Richard King Mellon Foundation · The Pittsburgh Foundation · Clapp G H Decd Char and Ed Tr · The Jack Buncher Foundation · Eqt Foundation · Allegheny Foundation · Eden Hall Foundation · The Grable Foundation · Hillman Family Foundations · Wi Patterson Charitable Fund · The Burke Foundation · The Burke Family 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.

Compare Martha Mack Lewis Foundation with peer funders

Warm introductions · Powered by PlinthPlus

How do I get to Martha Mack Lewis Foundation?

Find your warmest path to Martha Mack Lewis Foundation 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.

About Martha Mack Lewis Foundation

How much does Martha Mack Lewis Foundation give?
Martha Mack Lewis Foundation reported 8 grants totaling $60,000 in its FY2025 IRS filing. It funded between 6 and 10 organizations a year over FY2018 to FY2024.
What does Martha Mack Lewis Foundation fund?
By grant dollars over FY2017 to FY2025, its largest causes are Arts & Culture (42%), Education (26%), Human Services (14%).
Who are Martha Mack Lewis Foundation's largest grantees?
By total granted over FY2017 to FY2025: Carnegie Institute ($80k), The Kiski School ($65k), Gettysburg Foundation ($39k).
Does Martha Mack Lewis Foundation fund new organizations?
In FY2024, 29% of the organizations it funded were first-time grantees.
Does Martha Mack Lewis Foundation accept unsolicited applications?
Its most recent filing reports that it accepts unsolicited grant applications.
Which funders back the same organizations as Martha Mack Lewis Foundation?
Its strongest co-funders, measured against what their size predicts, include Richard King Mellon Foundation, The Pittsburgh Foundation, Clapp G H Decd Char and Ed Tr.
Where is Martha Mack Lewis Foundation based?
Martha Mack Lewis Foundation is based in PA.

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 26 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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