Esperantic Studies Foundation

Washington, DC
Tax-exempt since March 1969
EIN: 52-0885287

Receive an email when new data is available for this organization.

Type of Nonprofit

Designated as a 501(c)(3) Organizations for any of the following purposes: religious, educational, charitable, scientific, literary, testing for public safety, fostering national or international amateur sports competition (as long as it doesn't provide athletic facilities or equipment), or the prevention of cruelty to children or animals.

Donations to this organization are tax deductible.

Revenue

$260k (2023)

Expenses

$268k (2023)

Total Assets

$3.87M (2023)

Total Liabilities

$0 (2023)

Source: Form 990 tax filings from 2011 to 2023

Tax Filings by Year

Form 990 is an information return that most organizations claiming federal tax-exempt status must file yearly with the IRS. Nonprofit Explorer has IRS digitized Form 990 data for filings processed in 2012 and later. If this organization filed an amended return, it may not be reflected below. Duplicate download links may indicate a resubmission or amendment to this organization's original return. Form 990 data is from the IRS.

Fiscal Year Ending Dec.
2023

Revenue

$260,032

Expenses

$267,672

Net Income

-$7,640

Net Assets

$3,871,068

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$42,061	16.2%
Interest Revenue	$0
Dividends	$126,204	48.5%
Sales of Assets	$60,059	23.1%
Other Income	$31,708	12.2%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$220,621	82.4%
Compensation of Officers*	$37,620	14.1%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$3,871,068
Total Liabilities	$0
Net Assets	$3,871,068

Compensation

Key Employees and Officers	Compensation	Other
Charles Mays (Executive Director)	$37,620	$0
Humphrey Tonkin (President)	$0	$0
Grant Goodall (Vice President)	$0	$0
Derek Roff (Secretary)	$0	$0
Paige Feldmann (Director At Large)	$0	$0
Anna Bennett (Treasurer)	$0	$0
Marcia Rego (Director At Large)	$0	$0
Hans Becklin (Treasurer)	$0	$0
Francis Hult (Director At Large)	$0	$0
Mark Fettes (Vice President)	$0	$0
Wallace G Du Temple (Director/Investments Officer)	$0	$0
Geoffrey Greatrex (Director At Large)	$0	$0
Sebastian Schulman (Director At Large)	$0	$0

+ View more people

990-PF

Filed on Nov. 16, 2024

Primary tax return for a private foundation's activities, finances, and governance

View Filing

Schedules ▼

XML

Fiscal Year Ending Dec.
2022

Revenue

$221,838

Expenses

$247,058

Net Income

-$25,220

Net Assets

$3,738,467

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$49,132	22.1%
Interest Revenue	$0
Dividends	$109,334	49.3%
Sales of Assets	$37,937	17.1%
Other Income	$25,435	11.5%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$194,083	78.6%
Compensation of Officers*	$34,200	13.8%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$3,738,467
Total Liabilities	$0
Net Assets	$3,738,467

Compensation

Key Employees and Officers	Compensation	Other
Charles Mays (Executive Director)	$34,200	$0
Humphrey Tonkin (President)	$0	$0
Grant Goodall (Vice President)	$0	$0
Derek Roff (Secretary)	$0	$0
Paige Feldmann (Director At Large)	$0	$0
Anna Bennett (Treasurer)	$0	$0
Marcia Rego (Director At Large)	$0	$0
Hans Becklin (Director At Large)	$0	$0
Francis Hult (Director At Large)	$0	$0
Mark Fettes (Vice President)	$0	$0
Wallace G Du Temple (Director/Investments Officer)	$0	$0
Geoffrey Greatrex (Director At Large)	$0	$0
Sebastian Schulman (Director At Large)	$0	$0

+ View more people

990-PF

Filed on Sept. 30, 2023

Primary tax return for a private foundation's activities, finances, and governance

View Filing

Schedules ▼

PDF XML

Fiscal Year Ending Dec.
2021

Revenue

$237,052

Expenses

$192,833

Net Income

$44,219

Net Assets

$4,230,294

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$37,410	15.8%
Interest Revenue	$0
Dividends	$106,779	45.0%
Sales of Assets	$84,972	35.8%
Other Income	$7,891	3.3%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$183,742	95.3%
Compensation of Officers*	$33,000	17.1%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$4,230,294
Total Liabilities	$0
Net Assets	$4,230,294

Compensation

Key Employees and Officers	Compensation	Other
Charles Mays (Executive Director)	$33,000	$0
Humphrey Tonkin (President)	$0	$0
Grant Goodall (Vice President)	$0	$0
Derek Roff (Secretary)	$0	$0
Paige Feldmann (Director At Large)	$0	$0
Anna Bennett (Treasurer)	$0	$0
Marcia Rego (Director At Large)	$0	$0
Hans Becklin (Director At Large)	$0	$0
Francis Hult (Director At Large)	$0	$0
Mark Fettes (Vice President)	$0	$0
Wallace G Du Temple (Director/Investments Officer)	$0	$0
Geoffrey Greatrex (Director At Large)	$0	$0
Sebastian Schulman (Director At Large)	$0	$0

+ View more people

990-PF

Filed on Nov. 16, 2022

Primary tax return for a private foundation's activities, finances, and governance

View Filing

Schedules ▼

XML

Fiscal Year Ending Dec.
2020

Revenue

-$30,248

Expenses

$207,462

Net Income

-$237,710

Net Assets

$3,645,782

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$34,803
Interest Revenue	$0
Dividends	$99,008
Sales of Assets	$0
Other Income	$29,243

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$177,306	85.5%
Compensation of Officers*	$31,200	15.0%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$3,645,783
Total Liabilities	$1
Net Assets	$3,645,782

Compensation

Key Employees and Officers	Compensation	Other
Charles Mays (Executive Director)	$31,200	$0
Humphrey Tonkin (President)	$0	$0
Grant Goodall (Vice President)	$0	$0
Derek Roff (Secretary)	$0	$0
Ben Speakmon (Director At Large)	$0	$0
Anna Bennett (Treasurer)	$0	$0
Mark Fettes (Vice President)	$0	$0
Wallace G Du Temple (Director/Investments Officer)	$0	$0
Geoffrey Greatrex (Director At Large)	$0	$0
Esther Schor (Director At Large)	$0	$0
Hans Becklin (Director At Large)	$0	$0
Sebastian Schulman (Director At Large)	$0	$0

+ View more people

990-PF

Filed on May 17, 2021

Primary tax return for a private foundation's activities, finances, and governance

View Filing

Schedules ▼

XML

Fiscal Year Ending Dec.
2019

Revenue

$221,300

Expenses

$286,741

Net Income

-$65,441

Net Assets

$3,776,668

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$38,554	17.4%
Interest Revenue	$0
Dividends	$116,507	52.6%
Sales of Assets	$0
Other Income	$75,313	34.0%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$210,745	73.5%
Compensation of Officers*	$31,200	10.9%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$3,776,669
Total Liabilities	$1
Net Assets	$3,776,668

Compensation

Key Employees and Officers	Compensation	Other
Charles Mays (Executive Director)	$31,200	$0
Humphrey Tonkin (President)	$0	$0
Grant Goodall (Vice President)	$0	$0
Derek Roff (Secretary)	$0	$0
Ben Speakmon (Treasurer)	$0	$0
Anna Bennett (Director At Large)	$0	$0
Mark Fettes (Director At Large)	$0	$0
Wallace G Du Temple (Director/Investments Officer)	$0	$0
Geoffrey Greatrex (Director At Large)	$0	$0
Esther Schor (Director At Large)	$0	$0
Hans Becklin (Director At Large)	$0	$0

+ View more people

990-PF

Filed on Dec. 10, 2020

Primary tax return for a private foundation's activities, finances, and governance

View Filing

Schedules ▼

PDF XML

View Filing (2 of 2)

Fiscal Year Ending Dec.
2018

Revenue

$250,789

Expenses

$311,955

Net Income

-$61,166

Net Assets

$3,269,617

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$25,788	10.3%
Interest Revenue	$0
Dividends	$113,119	45.1%
Sales of Assets	$42,846	17.1%
Other Income	$69,036	27.5%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$236,863	75.9%
Compensation of Officers*	$28,600	9.2%
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$3,269,617
Total Liabilities	$0
Net Assets	$3,269,617

Compensation

Key Employees and Officers	Compensation	Other
Charles Mays (Executive Director)	$28,600	$0
Humphrey Tonkin (President)	$0	$0
Grant Goodall (Vice President)	$0	$0
Derek Roff (Secretary)	$0	$0
Ben Speakmon (Treasurer)	$0	$0
Anna Bennett (Director At Large)	$0	$0
Mark Fettes (Director At Large)	$0	$0
Wallace G Du Temple (Director/Investments Offic)	$0	$0
Geoffrey Greatrex (Director At Large)	$0	$0
Esther Schor (Director At Large)	$0	$0

+ View more people

990-PF

Filed on Dec. 10, 2020

Primary tax return for a private foundation's activities, finances, and governance

View Filing

Schedules ▼

PDF XML

View Filing (2 of 2) PDF (2 of 2)

Fiscal Year Ending Dec.
2017

Revenue

$466,079

Expenses

$295,748

Net Income

$170,331

Net Assets

$3,812,714

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$59,885	12.8%
Interest Revenue	$0
Dividends	$113,422	24.3%
Sales of Assets	$253,811	54.5%
Other Income	$38,961	8.4%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$254,685	86.1%
Compensation of Officers*	$0
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$3,812,714
Total Liabilities	$0
Net Assets	$3,812,714

Compensation

Key Employees and Officers	Compensation	Other
Humphrey Tonkin (President)	$0	$0
Grant Goodall (Vice President)	$0	$0
Derek Roff (Secretary)	$0	$0
Ben Speakmon (Treasurer)	$0	$0
Anna Bennett (Director At Large)	$0	$0
Mark Fettes (Director At Large)	$0	$0
Wallace G Du Temple (Director/Investments Offic)	$0	$0
Geoffrey Greatrex (Director At Large)	$0	$0
Esther Schor (Director At Large)	$0	$0
Charles Mays (Executive Director)	$0	$0

+ View more people

990-PF

Filed on Dec. 10, 2020

Primary tax return for a private foundation's activities, finances, and governance

View Filing

Schedules ▼

PDF XML

View Filing (2 of 2)

Fiscal Year Ending Dec.
2016

Revenue

$177,893

Expenses

$137,555

Net Income

$40,338

Net Assets

$3,471,555

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$26,879	15.1%
Interest Revenue	$0
Dividends	$111,271	62.5%
Sales of Assets	$0
Other Income	$39,743	22.3%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$71,410	51.9%
Compensation of Officers*	$0
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$3,471,555
Total Liabilities	$0
Net Assets	$3,471,555

Compensation

Key Employees and Officers	Compensation	Other
Humphrey Tonkin (President)	$0	$0
Grant Goodall (Vice President)	$0	$0
Derek Roff (Secretary)	$0	$0
Ben Speakmon (Treasurer Since 10/2016)	$0	$0
Anna Bennett (Treasurer Thru 09/2016; Then At Large)	$0	$0
Mark Fettes (Director At Large)	$0	$0
Wallace G Du Temple (Director/Investments Officer)	$0	$0
Geoffrey Greatrex (Director At Large)	$0	$0
Esther Schor (Director At Large)	$0	$0
Charles Mays (Executive Director)	$0	$0

+ View more people

990-PF

Filed on Dec. 19, 2017

Primary tax return for a private foundation's activities, finances, and governance

View Filing

Schedules ▼

PDF XML

Fiscal Year Ending Dec.
2015

Revenue

$352,164

Expenses

$164,703

Net Income

$187,461

Net Assets

$3,135,827

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$178,414	50.7%
Interest Revenue	$0
Dividends	$118,198	33.6%
Sales of Assets	$0
Other Income	$55,552	15.8%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$79,197	48.1%
Compensation of Officers*	$0
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$3,136,327
Total Liabilities	$500
Net Assets	$3,135,827

990-PF

Primary tax return for a private foundation's activities, finances, and governance

PDF

990-T

For unrelated business income from activities not substantially related to the organization's tax-exempt purpose

PDF

Fiscal Year Ending Dec.
2014

Revenue

$182,098

Expenses

$151,446

Net Income

$30,652

Net Assets

$3,307,142

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$21,572	11.8%
Interest Revenue	$0
Dividends	$122,918	67.5%
Sales of Assets	$0
Other Income	$37,608	20.7%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$80,982	53.5%
Compensation of Officers*	$0
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$3,307,142
Total Liabilities	$0
Net Assets	$3,307,142

990-PF

Primary tax return for a private foundation's activities, finances, and governance

PDF

990-T

For unrelated business income from activities not substantially related to the organization's tax-exempt purpose

PDF

Fiscal Year Ending Dec.
2013

Revenue

$656,899

Expenses

$159,326

Net Income

$497,573

Net Assets

$3,100,997

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$516,503	78.6%
Interest Revenue	$6	0.0%
Dividends	$100,450	15.3%
Sales of Assets	$0
Other Income	$43,653	6.6%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$90,471	56.8%
Compensation of Officers*	$0
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$3,100,997
Total Liabilities	$0
Net Assets	$3,100,997

990-PF

Primary tax return for a private foundation's activities, finances, and governance

PDF

990-T

For unrelated business income from activities not substantially related to the organization's tax-exempt purpose

PDF

Fiscal Year Ending Dec.
2012

Revenue

$349,566

Expenses

$421,995

Net Income

-$72,429

Net Assets

$2,291,915

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$17,351	5.0%
Interest Revenue	$0
Dividends	$78,537	22.5%
Sales of Assets	$224,008	64.1%
Other Income	$29,670	8.5%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$397,027	94.1%
Compensation of Officers*	$0
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$2,291,915
Total Liabilities	$0
Net Assets	$2,291,915

990-PF

Primary tax return for a private foundation's activities, finances, and governance

PDF

990-T

For unrelated business income from activities not substantially related to the organization's tax-exempt purpose

PDF

Fiscal Year Ending Dec.
2011

Revenue

$98,090

Expenses

$211,791

Net Income

-$113,701

Net Assets

$2,197,093

Notable Sources of Revenue		Percent of Total Revenue
Contributions Received	$9,488	9.7%
Interest Revenue	$0
Dividends	$63,865	65.1%
Sales of Assets	$3,971	4.0%
Other Income	$20,766	21.2%

Notable Expenses		Percent of Total Expenses
Charitable Disbursements	$166,170	78.5%
Compensation of Officers*	$0
* Officer compensation may be included in charitable disbursements, so Percent of Total Expenses may add up to greater than 100%.

Assets/Debt
Total Assets	$2,197,093
Total Liabilities	$0
Net Assets	$2,197,093

990-PF

Primary tax return for a private foundation's activities, finances, and governance

PDF

990-T

For unrelated business income from activities not substantially related to the organization's tax-exempt purpose

PDF

Fiscal Year Ending Dec.
2010

Extracted financial data is not available for the forms filed in this tax period, but Form 990 documents are available for download.

990-PF

Primary tax return for a private foundation's activities, finances, and governance

PDF

PDF (2 of 2)

990-T

For unrelated business income from activities not substantially related to the organization's tax-exempt purpose

PDF

Fiscal Year Ending Dec.
2009

Extracted financial data is not available for the forms filed in this tax period, but Form 990 documents are available for download.

990-PF

Primary tax return for a private foundation's activities, finances, and governance

What Is This Data?

Nonprofit Explorer includes summary data for nonprofit tax returns and full Form 990 documents, in both PDF and digital formats.

The summary data contains information processed by the IRS during the 2012-2019 calendar years; this generally consists of filings for the 2011-2018 fiscal years, but may include older records. This data release includes only a subset of what can be found in the full Form 990s.

In addition to the raw summary data, we link to PDFs and digital copies of full Form 990 documents wherever possible. This consists of separate releases by the IRS of Form 990 documents processed by the agency, which we update regularly.

We also link to copies of audits nonprofit organizations that spent $750,000 or more in Federal grant money in a single fiscal year since 2016. These audits are copied from the Federal Audit Clearinghouse.

Which Organizations Are Here?

Every organization that has been recognized as tax exempt by the IRS has to file Form 990 every year, unless they make less than $200,000 in revenue and have less than $500,000 in assets, in which case they have to file form 990-EZ. Organizations making less than $50,000 don’t have to file either form but do have to let the IRS they’re still in business via a Form 990N "e-Postcard."

Nonprofit Explorer has organizations claiming tax exemption in each of the 27 subsections of the 501(c) section of the tax code, and which have filed a Form 990, Form 990EZ or Form 990PF. Taxable trusts and private foundations that are required to file a form 990PF are also included. Small organizations filing a Form 990N "e-Postcard" are not included in this data.

Types of Nonprofits

There are 27 nonprofit designations based on the numbered subsections of section 501(c) of the tax code. See the list »

Get the Data

For those interested in acquiring the original data from the source, here’s where our data comes from:

Raw filing data. Includes EINs and summary financials as structured data.
Exempt Organization profiles. Includes organization names, addresses, etc. You can merge this with the raw filing data using EIN numbers.
Form 990 documents. Prior to 2017, these documents were obtained and processed by Public.Resource.org and ProPublica. Bulk PDF downloads since 2017 are available from the IRS.
Form 990 documents as XML files. Includes complete filing data (financial details, names of officers, tax schedules, etc.) in machine-readable format. Only available for electronically filed documents. Electronic data released prior to October 2021 is also available through Amazon Web Services.
Audits. PDFs of single or program-specific audits for nonprofit organizations that spent $750,000 or more in Federal grant money in a single fiscal year. Available for fiscal year 2015 and later.

API

The data powering this website is available programmatically, via an API. Read the API documentation »

See an issue with the data?

Nonprofit Explorer

Browse millions of annual returns filed by tax-exempt organizations with ProPublica’s Nonprofit Explorer. See details like executive compensation, revenue, expenses and more. Search for an organization or a person, or search the full text of filings.

By Andrea Suozzo, Alec Glassford, Ash Ngu and Brandon Roberts.

Design by Jeff Frankl. Additional development by Ken Schwencke, Mike Tigas, and Sisi Wei.

E-file viewer adapted from IRS e-File Viewer by Ben Getson. Code for scraping audit documents adapated from Govwiki.

Updated September 25, 2025

Esperantic Studies Foundation

Organization summary

Type of Nonprofit

Summary charts: organization finances over time

Revenue $260k (2023)

Expenses $268k (2023)

Total Assets $3.87M (2023)

Total Liabilities $0 (2023)

Tax Filings by Year

Fiscal Year Ending Dec. 2023

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2022

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2021

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2020

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2019

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2018

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2017

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2016

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Compensation

Document Links

990-PF

Fiscal Year Ending Dec. 2015

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Document Links

990-PF

990-T

Fiscal Year Ending Dec. 2014

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Document Links

990-PF

990-T

Fiscal Year Ending Dec. 2013

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Document Links

990-PF

990-T

Fiscal Year Ending Dec. 2012

Extracted Financial Data

Extracted Financial Data from Form 990-PF

Document Links

990-PF

Revenue

$260k (2023)

Expenses

$268k (2023)

Total Assets

$3.87M (2023)

Total Liabilities

$0 (2023)

Fiscal Year Ending Dec.
2023

Fiscal Year Ending Dec.
2022

Fiscal Year Ending Dec.
2021

Fiscal Year Ending Dec.
2020

Fiscal Year Ending Dec.
2019

Fiscal Year Ending Dec.
2018

Fiscal Year Ending Dec.
2017

Fiscal Year Ending Dec.
2016

Fiscal Year Ending Dec.
2015

Fiscal Year Ending Dec.
2014

Fiscal Year Ending Dec.
2013

Fiscal Year Ending Dec.
2012

Fiscal Year Ending Dec.
2011

Fiscal Year Ending Dec.
2010

Fiscal Year Ending Dec.
2009

Fiscal Year Ending Dec.
2008

Fiscal Year Ending Dec.
2007

Fiscal Year Ending Dec.
2006

Fiscal Year Ending Dec.
2005

Fiscal Year Ending Dec.
2004

Fiscal Year Ending Dec.
2003

Fiscal Year Ending Dec.
2002

Fiscal Year Ending Dec.
2001