· Private foundation
Macklanburg Foundation
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.
What you funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year — across FY2017–2025.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2025
- Under $10k19 grants · $75k
- $10k–50k9 grants · $127k
- $50k–250k1 grant · $100k
| Recipient | Amount |
|---|---|
| NATURE CONSERVANCY | $100,000 |
| REGIONAL FOOD BANK OF OKLAHOMA | $25,000 |
| OKLAHOMA STATE PARKS FOUNDATION | $20,000 |
| THOMAS GILCREASE INSTITUTTE OF AMER | $15,000 |
| BOSTON AVE UNITED METHODIST CHURCH | $15,000 |
| TULSA LITERARY COALITION | $12,000 |
| RED CROSS OKLAHOMA COUNTY CHAPTER | $10,000 |
| OKLAHOMA ART INSTITUTE QUARTZ MOUNT | $10,000 |
| OKLAHOMA HUMANITIES COUNCIL | $10,000 |
| Individual grant recipient | $10,000 |
| WESLEY METHODIST CHURCH | $8,000 |
| OKLAHOMA EDUCATIONAL TELEVISION ASS | $5,000 |
| LINDENWOOD GARDENS | $5,000 |
| TEEM OF OKLAHOMA CITY | $5,000 |
| THE SPERO PROJECT | $5,000 |
Do your dollars go where the need is?
Each grant placed by the hardship in its grantee’s ZIP, then read against the area’s typical level.
Dollar for dollar, your grants (FY17–25) land where the poverty rate runs at 16%, against an area that typically sits at 13%. 100% of your dollars go to grantees based in above-average-need neighborhoods. Most of your grants land in higher-need ZIPs.
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty linein the grantee’s ZIP, averaged from the tracts in that ZIP; grantee ZIP can differ from where services are delivered.
US grants placed by each grantee’s ZIP, which can differ from where services are actually delivered. Need from public data — U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA — shown as context about the area, never attributed to your giving.
Who you back again
Which organizations you funded more than once, and which you funded a single time. Each grantee is matched to its own filings.
34 repeat relationships — 25 still active in FY2025, 9 since wound down; 3 grantees were first funded in FY2025 (too recent to call).
How the two cohorts compare
Organizations
Total granted
Median revenue growth · since first grant
Still filing today
New vs renewed · share of each year
In FY2025, 93% of grant dollars renewed an existing relationship; $15k went to new ones.
Where new relationships form · theme of each grantee’s first grant
First-time = a grantee’s first year in your filing window; renewed = funded in an earlier year too. As a portfolio matures the renewed share naturally climbs — once funded, an org stays “renewable” — so the signal is the years that buck it (a new-grantee intake wave). 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
REGIONAL FOOD BANK OF OKLAHOMA INC9× · 2017–2025 · $165k · revenue +47%- OHOklahoma Humanities Council Inc9× · 2017–2025 · $79k · revenue +10%
- TLTulsa Literary Coalition Inc6× · 2019–2025 · $54k · revenue +201%
Funded once
- FOFriends of the Oklahoma History Centergraduatedone grant, 2017 · $10k · revenue +118%
- IGIndividual grant recipientone grant, 2021 · $10k
- TTEEMone grant, 2019 · $5k
Repeat = funded in two or more distinct years; growth and survival are read from each grantee’s own subsequent IRS filings.
The map has a center of gravity: the average direction from the rest of the sector toward the organizations the foundation funds — the shape of its giving. Scoring every nonprofit along that direction surfaces the ones that look most like the portfolio. These are the closest matchesthat aren’t grantees — a resemblance in what they say they do, not a recommendation.
The State Chamber is a statewide membership organization. Our purpose is to be the unified voice of business and the most effective advocacy organization at the State Capitol.
OKC Beautiful's mission is to lead beautification and environmental stewardship through collaboration, education and advocacy. We have been doing this for over 50 years through volunteers and contributing donors. This directly impacts the…
Supports Literacy Efforts Statewide by providing continuing education for literacy providers, grants to literacy organizations, and literacy awareness to government and media.
To promote the flourishing of the people of oklahoma by advancing principles and policies that support free enterprise, limited government, personal responsibility, and individual initiative.
To provide information to citizens. The organization encourages the utilization and developement of the State of Oklahomas resourses.
Oklahoma contemporary arts center encourages artistic expression in all its forms through education,exhibitions, and performance.
The Conservation Coalition of Oklahoma CCO is a nonpartisan 501c4 organization representing common-sense conservation policy in Oklahoma. Partnering with its 501c3 members, CCO advocates for science-based legislation protecting water,…
The goal of the oklahoma media center is to support and strengthen oklahoma's local journalism ecosystem and spur innovation through statewide collaboration that benefits diverse audiences and educate/informs the public on important…
To preserve the places where Oklahoma history lives.
For reference, the grantee most central to the portfolio’s shape is A Chance to Change Foundation and the most unlike its peers is The Nature Conservancy. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
11 grantees tracked through their own filings, 2017–2025.
Each one resolved to its own IRS returns and tracked year by year — your grant beside their revenue from every source. Association, dated; never a causal claim.
Counted here: distinct organizations you funded across 2017–2025, not grant rows in a single year — so this will not match the grant count on the cover. 11 of the 45 grantees resolved in that span have returns of their own we could reconcile; the rest are funded organizations whose filings we could not track year by year.
Where your money sits — by cause, then by grantee
Each org by its size and your share of it — top-left is where you’re load-bearing
Go grantee by grantee — a decade per org, and how each moved after you funded them
A decade per grantee — revenue shaded, your grants as bars, all rows on one timeline.
- Who funds THE NATURE CONSERVANCY ↗
- Who funds REGIONAL FOOD BANK OF OKLAHOMA INC ↗
- Who funds Oklahoma Humanities Council Inc ↗
- Who funds Tulsa Literary Coalition Inc ↗
- Who funds A CHANCE TO CHANGE FOUNDATION ↗
- Who funds SPECIAL OLYMPICS INC ↗
- Who funds THE SPERO PROJECT INC ↗
- Who funds OKLAHOMA WATCH INC ↗
- Who funds Friends of the Oklahoma History Center ↗
- Who funds SIXTWELVE INC ↗
- Who funds Tulsa Garden Center ↗
The grantmakers whose grantees overlap with yours far more than size alone predicts. Each orbits closer the stronger the alignment; the arcs between them show where they also fund each other. Here it reads as a tightly interlocked camp — most of these funders back each other's grantees too.
Open a dossier: Kirkpatrick Family Affiliated Fund of Occf Inc · Inasmuch Foundation · The Anne and Henry Zarrow Foundation · Oklahoma City Community Foundation Inc · Tulsa Community Foundation · Natl Christian Charitable Fdn Inc · Amazonsmile Foundation
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. A research starting point: overlap is association, not proof of shared intent.
Government reliance of your grantees
Every dot is one organization Macklanburg Foundation funds. Left–right is the share of its income from government; up–down is the share from you. Bigger dots raise more. Filter to federal or a single department — and drag the year to watch it move.
- Oklahoma Humanities Council Inc — 91% of income from government
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 your grant caused the public funding. Coverage is precision-first — a floor, not 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 12–24 months.
Warm introductions · Powered by PlinthPlus
How do I get to Macklanburg Foundation?
Find your warmest path to Macklanburg 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.