Marmot Foundation

The Marmot Foundation is a DuPont family private trust, established in June 1968 and headquartered at P.O. Box 323, Rehoboth Beach, Delaware 19971. All four trustees — Willis H. du Pont (Chairman), Lammot J. du Pont, Miren Dea du Pont, and Miren Dupont Sanchez — serve without compensation, confirming this is an intimate, family-governed philanthropy with no professional staff layer. IRS filings classify all 272 tracked grants under the broad category "GENERAL/EDUCATIONAL," reflecting a relationship-first approach rather than a programmatic one.

The foundation's giving philosophy maps closely to the DuPont family's personal geography and civic life across three anchor communities: Palm Beach, Florida (125 of 272 tracked grants, 46%), Wilmington/Rehoboth Beach, Delaware (76 grants, 28%), and Sun Valley, Idaho (41 grants, 15%). Organizations embedded in these communities — and personally known to the trustees — represent the realistic universe of fundable nonprofits. The foundation's own language is unambiguous: it "only makes contributions to preselected charitable organizations and does not accept unsolicited requests for funds."

The practical implication is stark. There is no open application cycle in the traditional sense. A first-time organization cannot mail a cold proposal and expect consideration. The pathway in runs through personal relationships — an introduction from an existing grantee (Rollins College, Hospital for Special Surgery, Norton Museum of Art, or Sun Valley Community School are among the most consistent recipients), a shared board member, a trustee encounter at a community event in Palm Beach or Sun Valley, or a documented organizational connection to the du Pont family's civic life.

If an organization develops a relationship and receives an invitation, the process is refreshingly simple: submit a written proposal — no formal form required — during April or October. Decisions follow in May and November respectively. There is no online portal; a concise 2-3 page letter mailed to the Rehoboth Beach address or emailed to info@marmotfoundation.org is appropriate.

Multi-year grantees dominate the database: nearly every organization in the top 50 shows 5 consecutive years of support, with consistent recurring gifts rather than one-time awards. This means the first grant is not an endpoint but the beginning of a longer institutional relationship. Organizations that invest in stewardship — regular impact updates to trustees, invitations to community events, authentic engagement with trustee interests — are best positioned to sustain and grow support over time.

The Marmot Foundation's tracked grant history spans 272 transactions totaling $8.36 million, yielding a per-grant average of $30,744. The foundation's internal profile sets the median at $25,000 (range: $5,000–$975,000 across the 42-grant analyzed subset). Annual giving has ranged from $965,000 in fiscal year 2020 — a COVID-depressed year — to $2.75 million in fiscal year 2024, per the 990-PF filed November 2025. The long-run giving trajectory shows sustained growth: $1.0M (FY2012), $1.21M (FY2013), $1.42M (FY2015), $1.40M (FY2019), $1.99M (FY2023), and $2.75M (FY2024).

Geographic distribution by grant count: Florida leads with 125 grants (46%), driven by Palm Beach-area institutions. Delaware follows with 76 grants (28%), concentrated in Wilmington-region organizations with DuPont family heritage connections — Brandywine Conservancy, Hagley Museum & Library, Delaware Botanic Gardens, Eleutherian Mills. Idaho accounts for 41 grants (15%), nearly all in the Sun Valley community: Higher Ground Sun Valley, Sun Valley Museum of Art, Swiftsure Ranch Therapeutic Equestrian Center, Pioneer Montessori, Sun Valley Ski Education Foundation. Pennsylvania receives 13 grants (5%), primarily through legacy DuPont-connected institutions.

By sector, healthcare and medical institutions attract approximately 18-20% of tracked giving: Hospital for Special Surgery ($365,000 cumulative), Mayo Foundation ($210,000), Humans for Healthcare ($145,000), Physicians for Peace ($135,000), Johns Hopkins Rheumatology Division ($130,000). Arts and culture represent roughly 15%: Norton Museum of Art ($220,000), Cox Science Center & Aquarium ($170,000), Brandywine Conservancy & Museum of Art ($160,000), Society of the Four Arts ($100,000), Sun Valley Museum of Art ($80,000). Education accounts for approximately 12%: Sun Valley Community School ($335,000), Rollins College ($245,000), Embry-Riddle Aeronautical University ($135,000), Pioneer Montessori ($95,000). Youth and human services contribute another 10%: Swiftsure Ranch Therapeutic Equestrian Center ($125,000), HPS Helping People Succeed ($115,000), Higher Ground Sun Valley ($95,000). Environmental and conservation causes represent approximately 7%: Florida Oceanographic Society ($135,000), Sun Valley Ski Education Foundation ($100,000), 1000 Friends of Florida ($65,000).

One structural anomaly: National Philanthropic Trust / Torque Foundation received $2.175 million across 5 grants, representing 26% of the entire tracked dataset — indicating the DuPont family routes a significant share of charitable capital through a donor-advised fund rather than direct grantmaking. In FY2024 this pattern intensified, with $2.7M of $2.75M total directed to NPT. Total foundation assets have declined from $28.6M (FY2019) to $21.2M (FY2024) as annual disbursements have consistently exceeded investment income.

The Marmot Foundation occupies a distinctive niche among Delaware-based private foundations with DuPont family connections. The comparison below situates Marmot alongside four closely related or geographically adjacent peers.

Marmot tracks closely with Welfare Foundation and Crystal Trust in annual giving volume, though both peer foundations concentrate almost exclusively on Delaware and Pennsylvania. Marmot's three-state geographic footprint (FL, DE, ID) is unusual among DuPont-affiliated grantmakers and reflects trustees' personal lifestyle geography — Palm Beach winters, Sun Valley summers, and Rehoboth Beach roots — rather than a programmatic rationale.

The Delaware Community Foundation is the most accessible alternative for organizations unable to secure a Marmot relationship: it operates an open, competitive grants process for Delaware nonprofits with transparent eligibility criteria and published deadlines. Longwood Foundation, the largest DuPont-related grantmaker, centers heavily on formal arts and conservation institutions in the Brandywine Valley. For applicants in Florida specifically, the Community Foundation of Palm Beach and the Treasure Coast offers a transparent, competitive alternative for organizations serving Palm Beach County.

The most recent publicly available financial data comes from the FY2024 Form 990-PF, filed November 17, 2025 (EIN 51-6022487). The filing reports $2.75 million in charitable disbursements — the highest recorded level in the foundation's tracked history and a 38.2% increase over FY2023's $2.19 million. Total assets fell to $21.18 million at year-end 2024, down from $22.66 million in FY2023, as disbursements substantially exceeded investment income of $1.46 million (derived primarily from dividends of $961,248 and asset sales of $500,648).

A striking structural shift appears in FY2024: the foundation made only 2 reported grants — $2.7 million to National Philanthropic Trust / Torque Foundation and $50,000 to New Hope Charities Inc. This is a significant departure from prior years, where the same trustees distributed $1.99–2.1 million across dozens of individual recipients. The consolidation suggests the family is increasingly channeling giving through a donor-advised fund vehicle, while maintaining direct relationships with a smaller core group of community grantees.

No leadership changes have been announced. Willis H. du Pont has served as chairman across every available tax year since at least 2012; Lammot J. du Pont, Miren Dea du Pont, and Miren Dupont Sanchez continue as trustees. All four serve without compensation, a consistent feature in every available filing. The foundation maintains no website content beyond a contact address, has no social media presence, and issues no press releases or public communications beyond its IRS filings. For current intelligence, the best public channel is ProPublica's Nonprofit Explorer (EIN 51-6022487), which posts 990-PF data within weeks of IRS filing.

The most consequential piece of advice for any organization pursuing Marmot Foundation funding: relationships precede grants. The foundation's own IRS filings state it "only makes contributions to preselected charitable organizations." This is not boilerplate — it reflects the operational reality of a four-trustee family foundation with no professional staff, no grants portal, and no published RFPs.

Map your relationship assets first. Identify whether any board member, executive, or community leader has a personal connection to Willis H. du Pont (Chairman, (202) 255-2600), Lammot J. du Pont, Miren Dea du Pont, or Miren Dupont Sanchez. Community overlap in Palm Beach, Sun Valley, or Wilmington/Rehoboth Beach is the most natural entry point. Peer introductions from existing grantees — Hospital for Special Surgery, Norton Museum of Art, Rollins College, St. Luke's Wood River Foundation, Florida Oceanographic Society — carry significant weight.

Geography is a hard filter. Applications from organizations without meaningful presence in Florida, Delaware, or Idaho will not succeed. The restriction language is explicit, and 96% of tracked grants confirm it. The foundation does not fund Pennsylvania organizations beyond DuPont-heritage institutions it has supported for decades.

When invited to submit, keep it brief. No formal application form exists. A 2-3 page letter proposal submitted to PO Box 323, Rehoboth Beach, DE 19971-0323 or emailed to info@marmotfoundation.org is appropriate. Cover: organizational overview, specific program or purpose, geographic scope (FL/DE/ID), requested amount, and a one-page budget summary. Avoid lengthy appendices.

Timing is fixed. Submit proposals in April (May decisions) or October (November decisions). Proposals submitted outside these windows will not align with the review cycle.

Calibrate your ask carefully. The median grant across 272 tracked transactions is $25,000. First-time relationships should anchor between $10,000 and $30,000. Multi-year grantees with 5+ year histories receive $20,000–$50,000 annually; long-term partners like Sun Valley Community School ($67,000/yr average) and Hospital for Special Surgery ($73,000/yr average) reflect exceptionally deep trustee engagement.

Sectors that resonate: specialty healthcare and medical research, arts and cultural institutions with community roots, environmental conservation with a local footprint, K-12 and higher education, therapeutic and youth-serving programs. Avoid applying if: your program serves individuals through scholarships, fellowships, or loans (explicitly excluded); your organization has no geographic connection to FL/DE/ID; or you have no realistic pathway to a trustee relationship.