The William C and Susan S Mariner

Private foundation · Grantmaker Ocean City, MD EIN: 47-1925405

The William C and Susan S Mariner is a private foundation, based in Ocean City, MD. IRS filing data is available from 2020 through 2025. As of 2025, the organization holds $5.8M in total assets. In 2025, it awarded 2 grants totaling $12K.

Key facts about The William C and Susan S Mariner

In short: The William C and Susan S Mariner gave $12K across 2 grants in 2025 (avg $6K), mostly in North Carolina. Source: 2025 IRS Form 990-PF.

EIN
47-1925405
Latest 990 filing
Form 990-PF, 2025
Annual giving (2025)
$12,000
Grants made (2025)
2
Average grant
$6,000
Median grant
$6,000
Total assets
$5,814,721
Primary geography
North Carolina (50% of itemized 2025 grant dollars)

Data from IRS Form 990-PF, 2025; updated September 2026.

Financial Overview

From 2025 IRS Form 990-PF · View filing

Total Assets

$5.8M

+17.1% YoY

Annual Giving

$12K

+0.0% YoY

Grant Count

2

+0.0% YoY

Avg Grant Size

$6K

+0.0% YoY

Under IRS private-foundation payout rules, The William C and Susan S Mariner reported a distributable amount of $51 for 2025 — the minimum it must pay out in qualifying distributions.

How The William C and Susan S Mariner gives

  • Giving grew 20% from 2022 to 2025. Method
  • In 2025 it paid out well above its IRS minimum distribution (the 5% rule). Method

From the foundation's IRS Form 990-PF filings. Methodology.

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Geographic Focus

Where this funder awards grants

Grant Distribution by State

2states

Share of 2025 grant dollars across all 2 itemized grants.

Cities

MediaWinston-Salem

Giving Over Time

Total grant dollars and number of grants per year

$0$5K$10K$15K2 grants2020 2 grants2021 2 grants2022 2 grants2023 2 grants2024 2 grants2025

From 2020 to 2025, annual grant giving ranged from $10K (2020) to $12K (2025). In 2025 it made 2 grants totaling $12K.

Grant Insights

How this funder distributes its grants

Top Recipients

Top 2 recipients in 2025

Old Salem Inc-Mesda: $6KOld Salem Inc-Mesda$6KThe Decorative Arts Trust: $6KThe Decorative Arts Trust$6K

The largest 2025 recipient was Old Salem Inc-Mesda ($6K). Together the top 2 received $12K.

Grant Size Distribution

10 grants across all recorded years

10<$50K$50–100K$100–250K$250–500K$500K–1M$1–5M$5M+

The most common grant size was under $50K: 10 grants of 10 (100%).

Giving History

Grant recipients and amounts by year

RecipientPurposeAmount
Old Salem Inc-Mesda Winston-Salem, NCSummer Institute$6,000
The Decorative Arts Trust Media, PASummer Institute$6,000

Financial History

Multi-year comparison from IRS filings

Revenue
Expenses
Qualifying Distributions
Net Investment Income
$0$1M$2M$3M$4M2020 2021 2022 2023 2024 2025
Metric202520242023
Total Assets$5,814,721$4,966,821$4,537,221
Revenue$859,900$441,600$3,153,474
Expenses$12,000$12,000$10,000
Qualifying Distributions$12,000$12,000$10,000
Distributable Amount$51$51$51

Data update history

When this profile's IRS filing data changed on Grantable

  1. Updated Form 990-PF for fiscal year 2020 (received by the IRS April 9, 2021)
  2. Updated Form 990-PF for fiscal year 2021 (received by the IRS April 12, 2022)
  3. Updated Form 990-PF for fiscal year 2022 (received by the IRS April 15, 2023)
  4. Updated Form 990-PF for fiscal year 2023 (received by the IRS April 10, 2024)
  5. Updated Form 990-PF for fiscal year 2024 (received by the IRS March 6, 2025)
  6. Updated Form 990-PF for fiscal year 2025 (received by the IRS April 11, 2026)
  7. IRS filings on file for fiscal years 2020–2025

Leadership & Key People

Officers and directors from IRS filings

The William C and Susan S Mariner is led by William C. Mariner, President & Treasurer on every filing since 2020; none of the 2 officers listed in 2025 report compensation.

Officers on the 2025 filing

  • William C. Mariner

    President & Treasurer

    On filings since 2020

    1 hr/week

    No compensation reported

  • Susan S. Mariner

    V.p. & Secretary

    On filings since 2020

    1 hr/week

    No compensation reported

Data from IRS Form 990 filings, 2020–2025. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.

Frequently asked questions about The William C and Susan S Mariner

How much does The William C and Susan S Mariner give each year?

The William C and Susan S Mariner gave $12K across 2 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $12K across 2 grants.

How large is The William C and Susan S Mariner?

The William C and Susan S Mariner reported $5.8M in total assets on its 2025 IRS Form 990-PF. It paid out $12K in qualifying distributions that year, against a required minimum of $51 (roughly 5% of its investment assets).

Where does The William C and Susan S Mariner operate?

The William C and Susan S Mariner has awarded grants in North Carolina, Pennsylvania.

What is The William C and Susan S Mariner's EIN?

The William C and Susan S Mariner's EIN (Employer Identification Number) is 47-1925405. IRS Form 990 filing data is available on this page for 2020–2025.

Data last updated September 2026. Sourced from IRS Form 990-PF filings.

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