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A P GIANNINI FOUNDATION

EIN 94-6089512 SAN RAFAEL, CA

Browse the largest nonprofits in California

Revenue 2025
$1,962,724
Expenses 2025
$1,904,488

As filed

Subsection
03
Classification
2000
Street
PO BOX 6106

These codes are the IRS's own and are shown exactly as filed. What each one means is in the Business Master File documentation (opens in a new tab).

Other organizations at this address

15 other organizations in the IRS Business Master File list the same street address. matched by us

We match the street line and ZIP code as the IRS gives them, ignoring case and outer spaces and nothing else, so "AVE" and "AVENUE" count as different streets and this list can miss some. A shared address can mean related organizations or a shared office, but it can also be a registered agent, a mail drop or a service provider holding mail for unrelated clients. It is not, by itself, evidence that two organizations are connected.

Officers and directors · 2025

As listed in Part VII of the 2025 return, in the order the filer printed them. Each return names its own; this is not a roster the organization keeps with us.

  • Mike Mantle

    TREASURER

    Total calculated
    $0
    Hours/week
    0
  • Virginia Hammerness

    DIRECTOR - (DEC'D 05/31/25)

    Total calculated
    $0
    Hours/week
    0
  • Mark C Perry

    CHAIRMAN

    Total calculated
    $0
    Hours/week
    0
  • Bruce U Wintroub MD

    DIRECTOR

    Total calculated
    $0
    Hours/week
    0
  • Keith Grossman

    DIRECTOR

    Total calculated
    $0
    Hours/week
    0
  • Jack L Meyers

    VICE-CHAIRMAN

    Total calculated
    $0
    Hours/week
    0
  • Anne McWilliams

    EMERITUS TRUSTEE

    Total calculated
    $0
    Hours/week
    0
  • Keith McWilliams

    SECRETARY

    Total calculated
    $0
    Hours/week
    0
  • Mark Chaomdphd

    DIRECTOR

    Total calculated
    $0
    Hours/week
    0

Compensation is as filed in Part VII: reportable pay from this organization and from related organizations, other compensation, and hours per week. The total, marked calculated, is our sum of the three dollar columns, with a blank column counted as $0; the form itself has no total. On a Form 990-EZ the columns are Part IV's instead, and on a Form 990-PF Part VIII's — compensation, contributions to benefit plans, and expense account — and the total sums those. Earlier years are each on their own filing page.

Filings

  • 2025
    Revenue
    $1,962,724
    Expenses
    $1,904,488
    Contributions
    $168,165
    Grants paid
    $1,209,000
  • 2024
    Revenue
    $1,328,839
    Expenses
    $1,750,729
    Contributions
    $181,190
    Grants paid
    $1,155,000
  • 2023
    Revenue
    $1,375,199
    Expenses
    $1,634,730
    Contributions
    $247,602
    Grants paid
    $1,021,000
  • 2022
    Revenue
    $992,112
    Expenses
    $1,837,306
    Contributions
    $82,061
    Grants paid
    $1,220,673

The four totals the IRS asks for on Part I of the Form 990, as filed. A dash means the figure was not present on the return — not that it was zero.

Other returns filed

  • 2021 · 990-PF

    Revenue
    $2,499,734
    Expenses
    $1,336,596
    Assets (EOY)
    $29,460,942
  • 2020 · 990-PF

    Revenue
    $1,579,026
    Expenses
    $1,564,051
    Assets (EOY)
    $26,078,476
  • 2019 · 990-PF

    Revenue
    $2,104,001
    Expenses
    $1,573,187
    Assets (EOY)
    $25,540,466
  • 2018 · 990-PF

    Revenue
    $1,735,259
    Expenses
    $1,929,350
    Assets (EOY)
    $22,827,155
  • 2017 · 990-PF

    Revenue
    $1,682,964
    Expenses
    $1,386,185
    Assets (EOY)
    $24,888,576
  • 2016 · 990-PF

    Revenue
    $1,573,618
    Expenses
    $1,679,829
    Assets (EOY)
    $22,580,729
  • 2015 · 990-PF

    Revenue
    $2,268,534
    Expenses
    $1,401,688
    Assets (EOY)
    $21,870,165

Nonprofiteer parses Forms 990, 990-EZ and 990-PF, in a window of recent tax years. These returns are recorded from the IRS e-file index, so their figures were extracted by that index rather than read from the return here — treat them as a different source from the filings above, not as more of the same record. A dash means the index carries no figure; Form 990-T listings carry none at all.

Grants paid

From Part XV of the 2025 Form 990-PF , the newest this foundation filed that we hold.

  • STANFORD UNIVERSITY SCHOOL OF MEDICINE

    $70,000

    PALO ALTO, CA FOR MEDICAL RESEARCH FELLOWSHIP-BASTO

  • STANFORD UNIVERSITY SCHOOL OF MEDICINE

    $70,000

    PALO ALTO, CA FOR MEDICAL RESEARCH FELLOWSHIP-CHANIN

  • STANFORD UNIVERSITY SCHOOL OF MEDICINE

    $70,000

    PALO ALTO, CA FOR MEDICAL RESEARCH FELLOWSHIP-VAN EGEREN

  • STANFORD UNIVERSITY SCHOOL OF MEDICINE

    $70,000

    PALO ALTO, CA FOR MEDICAL RESEARCH FELLOWSHIP-LI

  • UC IRVINE SCHOOL OF MEDICINE

    $70,000

    IRVINE, CA FOR MEDICAL RESEARCH FELLOWSHIP-YONAN

  • UC IRVINE SCHOOL OF MEDICINE

    $70,000

    IRVINE, CA FOR MEDICAL RESEARCH FELLOWSHIP-PENDLEBURY

  • UC SAN DIEGO SCHOOL OF MEDICINE

    $70,000

    LA JOLLA, CA FOR MEDICAL RESEARCH FELLOWSHIP-NGO

  • UC SAN DIEGO SCHOOL OF MEDICINE

    $70,000

    LA JOLLA, CA FOR MEDICAL RESEARCH FELLOWSHIP-DOUD

  • UC SAN FRANCISCO SCHOOL OF MEDICINE

    $70,000

    SAN FRANCISCO, CA FOR MEDICAL RESEARCH FELLOWSHIP-JIN

  • UC SAN FRANCISCO SCHOOL OF MEDICINE

    $70,000

    SAN FRANCISCO, CA FOR MEDICAL RESEARCH FELLOWSHIP-KONJIKUSIC

The 10 largest to organizations. The filing page shows this return's totals, and the API serves every grant row.

Grants made

No itemized grants to organizations. Schedule I is filed only by organizations that granted more than $5,000 to a recipient, so most filers have none.

Grants received

Related organizations

From Schedule R Part II, where a filer lists the tax-exempt organizations it is related to by control. It does not record shared board members or money.

Declared as related by

Other IRS files

Auto-Revocation List

Not listed. The IRS publishes this list for organizations whose exemption was automatically revoked for failing to file for three consecutive years.

Publication 78

Listed as of 11 November 2026, under deductibility PF.

These are two separate IRS files on two separate schedules, shown as published and not reconciled with each other. Neither is a statement about whether a contribution is deductible today: 19,245 organizations appear in Publication 78 while the IRS's own revocation file lists them as currently revoked, more than half of those revoked before 2019. Absence from Publication 78 is evidence of nothing, and presence is not evidence either. Verify current status with the IRS before relying on it.

What this page reflects

The registration facts above come from the IRS Business Master File published 9 November 2026 and read 9 November 2026, for every organization at once. Returns through tax year 2025, the newest we have parsed for this organization.