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MORTON ARBORETUM

EIN 36-1505770 LISLE, IL

Revenue 2024
$57,793,716
Expenses 2024
$58,286,620

Program services were 82.5% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection
03
NTEE code
C410
Classification
1200
Street
4100 ILLINOIS ROUTE 53

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).

Officers and directors · 2024

As listed in Part VII of the 2024 return, in the order the filer printed them. Each return names its own; this is not a roster the organization keeps with us.

  • ROBERT J SCHILLERSTROM

    CHAIR

    Total calculated
    $0
    Hours/week
    8

  • ANNA CAROLINE BALL

    VICE CHAIR

    Total calculated
    $0
    Hours/week
    8

  • E JAMES DONDLINGER

    TREASURER

    Total calculated
    $0
    Hours/week
    8

  • JAMAL J SCOTT

    SECRETARY

    Total calculated
    $0
    Hours/week
    8

  • KELLY POWERS BARIA

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • ROBERT A BARTLETT JR

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • PAT A BASU

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • WALTER W BECKY II

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • BARBARA J BRADFORD

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • CHRISTOPHER B BURKE

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • MARY L BURKE

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • MICHAEL CAHILL

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • TRISHA L CONLEY

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • ROBERT L FEALY

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • ASHESH GOEL

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • MARK C GOSSETT

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • TROY D HAMMOND

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • MATT HARRIS

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • ANDREW O JOHNSON

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • ROBERT E KRESS

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • CHARLES P MCQUAID

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • MILAN MRKSICH

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • CURTIS X REED

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • STEPHEN C VAN ARSDELL

    TRUSTEE

    Total calculated
    $0
    Hours/week
    8

  • KOSKI JILL

    PRESIDENT AND CEO

    Total calculated
    $631,541
    From this org
    $565,997
    From related orgs
    $0
    Other
    $65,544
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $520,492
    Bonus
    $45,505
    Other
    $0
    Deferred
    $23,782
    Nontaxable benefits
    $41,762
    Filer's total
    $631,541

The first 25 listed. 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 — compensation, contributions to benefit plans, and expense account — and the total sums those. A Schedule J breakdown is as filed: base pay, bonus, other, deferred compensation and nontaxable benefits from this organization, with any from related organizations beside each, and the filer's own total. It is shown with the Part VII listing of the same name on the same return. The form gives no key between the two, so that pairing is ours, and is marked matched by us. Earlier years are each on their own filing page.

Filings

  • 2024
    Revenue
    $57,793,716
    Expenses
    $58,286,620
    Contributions
    $19,759,730
    Grants paid
    $1,465,749
  • 2023
    Revenue
    $45,149,282
    Expenses
    $52,201,196
    Contributions
    $18,150,596
    Grants paid
    $982,437
  • 2022
    Revenue
    $53,650,331
    Expenses
    $47,787,763
    Contributions
    $20,701,830
    Grants paid
    $935,489

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

  • 2024 · 990-T

    Revenue
    not reported
    Expenses
    not reported
    Assets (EOY)
    not reported

  • 2023 · 990-T

    Revenue
    not reported
    Expenses
    not reported
    Assets (EOY)
    not reported

  • 2022 · 990-T

    Revenue
    not reported
    Expenses
    not reported
    Assets (EOY)
    not reported

Nonprofiteer parses the Form 990 only. 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 made

The 10 largest by cash amount. The API serves every itemized grant.

Where these grants went next →

Grants received

The 10 largest by cash amount. The API serves every itemized grant.

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 10 September 2026, under deductibility PC.

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.