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Open Space Institute Inc

Osi and its supporting organization, open space institute land trust, protects land.

Environment New York, NY EIN: 521053406 (IRS) Sign up to see website
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74
Integrity Assessment
Strong transparency
74/100 · methodology

About Open Space Institute Inc

OSI protects land for clean drinking water, public recreation, healthy communities, wildlife habitat, and climate protection, since the intact forests and floodplains we protect capture carbon and protect against extreme weather events.

Founded
Headquarters
New York, NY
Foundation type
Publicly-supported charity (509(a)(2))
NTEE code
C30
IRS subsection
501(c)(03)
Ruling date
Size
large

Verified certifications

Confirmed against the issuing authority - not self-reported.

IRS Tax-Deductible since 1966

Mission

Osi and its supporting organization, open space institute land trust, protects land.

Focus areas & reach

· What they work on and where

How it stacks up against peers

· vs. 8 similar environment in United States
Program spending This charity: 60%
Peer average: 78%
CEO comp as % of revenue This charity: 8.39%
Peer average: 0.48%
Integrity Assessment This charity: 74
Peer average: 90

Concerns

· 1 red flag
High Executive Pay
Top executive compensation is 15.7% of total expenses ($575,272 of $3,655,960).

Where every $1 goes

· FY2024 · IRS 990 (FY2024)
$0.60
Program$0.60

GiveRadar Analysis

Original analysis from GiveRadar's dataset of comparable organizations

GiveRadar's verified records show Open Space Institute Inc with a complete profile, sourced from the IRS.

  • Established in 1974, it predates 86% of the environment charities in the United States GiveRadar has a founding year for. View this cohort
  • GiveRadar holds a more complete profile for this organization than for 80% of the 30,143 environment charities in the United States it tracks, because GiveRadar has verified its financial disclosures and its governance. Most of those have little verified data on record yet. View this cohort
  • It has more complete contact information than nearly all comparable charities, with a verified website, email, phone and address on record. See national comparisons
GiveRadar has verified
  • government registration
  • financial records (5 filed years)
  • disclosed leadership
  • a website
  • a contact email
  • a donation page
Not yet verified by GiveRadar
  • an owner-submitted profile claim

Analysis based on GiveRadar's benchmark dataset of 2026-07-03. It describes what GiveRadar has verified, not a judgment of the organization itself.

Common questions

· Auto-generated from filings + methodology

Open Space Institute Inc is a registered environment nonprofit based in New York, NY, United States. It is registered with the Internal Revenue Service (IRS). It was founded in 1974 and has been operating for 52 years. Its EIN is 521053406. According to GiveRadar's records, it holds active tax-deductible status on the IRS Publication 78 list, which means donations are tax-deductible and the organization is in good standing with the IRS. GiveRadar's Integrity Assessment for the organization is 74/100, which reflects how much public information is available, not whether the charity is legitimate. The organization reports $7M in annual revenue. 214 officers and directors are publicly disclosed. GiveRadar has identified 1 potential concern.

Open Space Institute Inc's EIN (Employer Identification Number) is 521053406. This is the organization's IRS tax identification number; you can use it to verify tax-exempt status and to look up its Form 990 filings with the IRS.

Open Space Institute Inc has a GiveRadar Integrity Assessment of 74/100. This score combines five components: Registration (20 pts), Financial Transparency (30 pts), Governance (20 pts), Contact Availability (10 pts), and Data Recency (20 pts), with negative adjustments for any red flags. A score of 74 ('Strong transparency') reflects well-documented governance, recent financials, named leadership, and working contact details. For comparison, the average integrity assessment for environment charities in United States is 90/100.

Open Space Institute Inc is located in New York, NY, United States. The organization was established in 1974 and has been active for 52 years.

Based on official tax filings, Open Space Institute Inc has $7M in annual revenue. It allocates 60% of expenses to programs and services. This is below the average of 78% for environment charities in United States. Its revenue is significantly above the peer average of $2M. Create a free GiveRadar account to view the complete financial breakdown with year-over-year trends.

Open Space Institute Inc is classified as an Environment organization, registered in United States. It operates as a Publicly-supported charity (509(a)(2)). By size, it is categorized as a large organization. It has $7M in annual revenue. The organization has 214 disclosed officers and directors.

GiveRadar has identified 1 potential concern for Open Space Institute Inc. Red flags are automatically detected from official data and may include high executive compensation relative to budget, low program spending, or missing financial filings. Red flags do not necessarily mean wrongdoing but indicate areas that may warrant further review before donating.

According to GiveRadar's records, Open Space Institute Inc holds active tax-deductible status on the IRS Publication 78 list, which means donations are tax-deductible and the organization is in good standing with the IRS. It is registered with the Internal Revenue Service (IRS). It reports that 60% of expenses go to programs (the peer average is 78%). You can donate directly through their official donation page linked on their GiveRadar profile. GiveRadar provides data for research and does not endorse any organization. A GiveRadar Integrity Assessment reflects how much public data is available, not whether an organization is safe to donate to, so it is always smart to do your own research before giving.

OSI protects land for clean drinking water, public recreation, healthy communities, wildlife habitat, and climate protection, since the intact forests and floodplains we protect capture carbon and protect against extreme weather events. Open Space Institute Inc is classified as an environment organization registered in United States. The organization was founded in 1974.

Among environment charities registered in United States: It allocates 60% of expenses to programs, below the peer average of 78%. Its annual revenue of $7M is well above the peer average of $2M.

Yes, donations to Open Space Institute Inc are generally tax-deductible in the United States. Open Space Institute Inc is a 501(c)(3) tax-exempt organization. Its EIN is 521053406, which you can use for tax filing purposes. Donors can typically deduct contributions on their federal income tax return if they itemize deductions. Consult a tax professional for guidance specific to your situation.

Annual revenue
$1M-$10M
60% to programs
Source: IRS 990 (FY2024) why this matters
Unlock exact figures

Filing history

5 years on file from IRS 990 (FY2024): revenue, expenses, program spending, assets, and liabilities by fiscal year.

Years on record: FY2024, FY2023, FY2022, FY2021, FY2020.
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Taxes

Tax-deductibility for donors

Donations may be tax-deductible for residents of United States under local rules. Confirm with the charity directly.

Always confirm tax treatment with the charity directly or your tax advisor before donating.

Staff & volunteers

From filings and published profiles

Employees
86

Leadership

From FY2024 filing

AL
Alice G••••••
CFO

Officers & trustees (25)

Source: Public filings

See full names, roles, and stories

25 officers and trustees on file - free with a GiveRadar account.

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Latest news

From global news sources

No recent news coverage found

News coverage will appear here when articles mention this organization.

Activity timeline

Filings and press mentions, merged

Form filed
$6.9M revenue
FY2024
IRS 990
Form filed
$5.9M revenue
FY2023
IRS 990
Form filed
$2.1M revenue
FY2022
IRS 990
Form filed
$2.3M revenue
FY2021
IRS 990
Form filed
$1.7M revenue
FY2020
IRS 990

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Cause areas in United States

How many charities work in each area, with this charity's area highlighted.

Human Services 322,679
Education 195,586
Arts & Culture 133,128
Advocacy & Civil Rights 128,026
Religion 114,636
Health 98,862
Community Development 56,086
Youth Development 53,450
Environment this charity 30,143
See all cause areas in United States

Most common causes in United States

Causes charities work on most.

Community Development 235,146
Education 159,016
Religion 103,741
Arts & Culture 101,203
Human Rights 76,926
Health 65,250
Youth Development 47,775
Animal Welfare 32,425

Sources and verification

Registration and legal identity
Internal Revenue Service (IRS) - Tax Exempt Organization Search
Financial filings
IRS Form 990 filings - Fiscal year 2024 most recent on file.
Officers and trustees
Internal Revenue Service (IRS) - Tax Exempt Organization Search - 214 disclosed in the public registry.

Data freshness

Last updated
Jun 12, 2026
Registry checked
Jun 6, 2026
Profile completeness
90%

What we know and don't know

Exactly which public data we hold on this charity. Our score reflects transparency, not impact.

On record · 10
  • Financial data · FY2024 on record
  • Named leadership · 214 officers on file
  • Executive pay · Disclosed
  • Government registration · Registered with an official registry
  • Mission statement · Published
  • Official website · On record
  • Headquarters address · On file
  • Direct contact · Email or phone published
  • Tax-deductibility · Verified
  • Founding date · 1974
Not available · 1
  • Programs & activities
    No named programs listed by the charity

Methodology

GiveRadar builds each profile primarily from official government charity registries, supplemented where available by third-party nonprofit databases and news archives, and combines it into a single 0-100 integrity assessment. The exact sources for this charity are listed above. We don't take a cut of any donation, ever.

Read full methodology

Are you the owner or a board member?

If you represent this organization and want to correct or update its data, you can claim this listing to edit details yourself, or email [email protected] with the correct information. We review every request and respond within 30 days.

Quick facts about Open Space Institute Inc

What is Open Space Institute Inc?
Open Space Institute Inc is a environment publicly-supported charity (509(a)(2)) based in New York, United States. OSI protects land for clean drinking water, public recreation, healthy communities, wildlife habitat, and climate protection, since the intact forests and floodplains we protect capture carbon and protect against extreme weather events.
When was Open Space Institute Inc founded?
Open Space Institute Inc was founded in 1974.
Who leads Open Space Institute Inc?
Alice Gleason serves as CFO.
Where is Open Space Institute Inc located?
Headquartered in New York, NY, United States.
What is Open Space Institute Inc's annual budget?
Annual revenue for fiscal year 2024 is approximately $1M-$10M. 60% of expenses go to program services.
Is Open Space Institute Inc trustworthy?
Open Space Institute Inc has a GiveRadar Integrity Assessment of 74 out of 100 (Strong transparency). The score reflects public-data transparency: registration, financial disclosure, governance, contact details, and how recently data was refreshed. It does not measure program impact.
What is Open Space Institute Inc's registration number?
IRS EIN: 521053406.
What is Open Space Institute Inc's website?
https://www.openspaceinstitute.org