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Mariadb Foundation

  • Wakefield, MA
  • EIN: 38-3890082

Organization summary

Organization summary might be incomplete or out of date

This organization is not listed in the IRS's most recent list of tax exempt organizations, but we have data associated with this Employer Identification Number.

Type of Nonprofit

Designated as a Business leagues, chambers of commerce, real estate boards, etc, created for the improvement of business conditions.

Summary charts: organization finances over time

Revenue
$1.61M (2024)

Expenses
$1.55M (2024)

Total Assets
$256k (2024)

Total Liabilities
$939k (2024)

Source: Form 990 tax filings from 2015 to 2024

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.
2024

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$1,609,317
Expenses
$1,551,755
Net Income
$57,562
Net Assets
-$682,120
Notable Sources of Revenue Percent of Total Revenue
Contributions $0
Program Services $1,599,700
99.4%
Investment Income $0
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $9,617
0.6%
Notable Expenses Percent of Total Expenses
Executive Compensation $599,387
38.6%
Professional Fundraising Fees $0
Other Salaries and Wages $5,290
0.3%
Assets/Debt
Total Assets $256,409
Total Liabilities $938,529
Net Assets -$682,120
Compensation
Key Employees and Officers Compensation Related Other
Kaj Arno (Ceo) $452,413 $0 $0
Michael Widenius (Cto) $146,974 $0 $0
Barry Abrahamson (Director) $0 $0 $0
Todd Boyd (Director) $0 $0 $0
Sirish Chandrasekaran (Director) $0 $0 $0
Sergei Golubchik (Director) $0 $0 $0
Espen Hakonsen (Director) $0 $0 $0
Paul Obrian (Director) $0 $0 $0
Sean Peng (Director) $0 $0 $0
Steve Shaw (Director) $0 $0 $0
Eric Herman (Chairman) $0 $0 $0
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Document Links

990
Filed on Nov. 17, 2025

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending Dec.
2023

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$799,791
Expenses
$1,226,973
Net Income
-$427,182
Net Assets
-$739,682
Notable Sources of Revenue Percent of Total Revenue
Contributions $0
Program Services $799,791
100%
Investment Income $0
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $112,350
9.2%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $122,794
Total Liabilities $862,476
Net Assets -$739,682
Compensation
Key Employees and Officers Compensation Related Other
Kaj Arno (Ceo) $120,394 $0 $33,161
Barry Abrahamson (Director) $0 $0 $0
Todd Boyd (Director) $0 $0 $0
Sirish Chandrasekaran (Director) $0 $0 $0
Sergei Golubchik (Director) $0 $0 $0
Espen Hakonsen (Director) $0 $0 $0
Paul Obrian (Director) $0 $0 $0
Sean Peng (Director) $0 $0 $0
Steve Shaw (Director) $0 $0 $0
Eric Herman (Chairman) $0 $0 $0
Michael Widenius (Cto) $0 $0 $0
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Document Links

990
Filed on Nov. 15, 2024

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending Dec.
2022

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$1,195,322
Expenses
$956,690
Net Income
$238,632
Net Assets
-$312,500
Notable Sources of Revenue Percent of Total Revenue
Contributions $0
Program Services $1,195,322
100%
Investment Income $0
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $120,582
12.6%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $123,053
Total Liabilities $435,553
Net Assets -$312,500
Compensation
Key Employees and Officers Compensation Related Other
Kaj Arno (Ceo) $120,582 $0 $32,510
Barry Abrahamson (Director) $0 $0 $0
Todd Boyd (Director) $0 $0 $0
Sergei Golubchik (Director) $0 $0 $0
Espen Hakonsen (Director) $0 $0 $0
Max Mether (Director) $0 $0 $0
Sean Peng (Director) $0 $0 $0
Steve Shaw (Director) $0 $0 $0
Eric Herman (Chairman) $0 $0 $0
Michael Widenius (Cto) $0 $0 $0
+ View more people

Document Links

990
Filed on Nov. 13, 2023

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2021

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$903,053
Expenses
$1,062,908
Net Income
-$159,855
Net Assets
-$551,132
Notable Sources of Revenue Percent of Total Revenue
Contributions $0
Program Services $903,053
100%
Investment Income $0
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $152,269
14.3%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $146,900
Total Liabilities $698,032
Net Assets -$551,132
Compensation
Key Employees and Officers Compensation Related Other
Kaj Arno (Ceo) $152,269 $0 $33,878
Barry Abrahamson (Director) $0 $0 $0
Todd Boyd (Director) $0 $0 $0
Sergei Golubchik (Director) $0 $0 $0
Espen Hakonsen (Director) $0 $0 $0
Max Mether (Director) $0 $0 $0
Sean Peng (Director) $0 $0 $0
Steve Shaw (Director) $0 $0 $0
Eric Herman (Chairman) $0 $0 $0
Michael Widenius (Cto) $0 $0 $0
+ View more people

Document Links

990
Filed on Nov. 15, 2022

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2020

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$888,742
Expenses
$869,395
Net Income
$19,347
Net Assets
-$391,277
Notable Sources of Revenue Percent of Total Revenue
Contributions $353
0.0%
Program Services $888,389
100.0%
Investment Income $0
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $141,478
16.3%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $4,120
Total Liabilities $395,397
Net Assets -$391,277
Compensation
Key Employees and Officers Compensation Related Other
Kaj Arno (Ceo) $123,874 $0 $17,604
Pat Casey (Director) $0 $0 $0
Jurgen Ingles (Director) $0 $0 $0
Paul Jenkinson (Director) $0 $0 $0
Fei Fei Li (Director) $0 $0 $0
Scott Raskin (Director) $0 $0 $0
Michael Widenius (Director) $0 $0 $0
Eric Herman (Chairman) $0 $0 $0
Michael Howard (Ceo) $0 $0 $0
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Document Links

990
Filed on Nov. 30, 2021

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2019

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$413,449
Expenses
$1,086,800
Net Income
-$673,351
Net Assets
-$410,624
Notable Sources of Revenue Percent of Total Revenue
Contributions $770
0.2%
Program Services $412,679
99.8%
Investment Income $0
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $142,890
13.1%
Professional Fundraising Fees $0
Other Salaries and Wages $1,877
0.2%
Assets/Debt
Total Assets $114,580
Total Liabilities $525,204
Net Assets -$410,624
Compensation
Key Employees and Officers Compensation Related Other
Kaj Arno (Ceo) $113,264 $0 $29,626
Michael Howard (Director) $0 $0 $0
Michael Widenius (Director) $0 $0 $0
Espen Hkonsen (Director) $0 $0 $0
Fangxin Lou (Director) $0 $0 $0
Qinglin Zhang (Director) $0 $0 $0
Sudhakar Sannakkayala (Director) $0 $0 $0
Todd Boyd (Director) $0 $0 $0
Eric Herman (Chairman) $0 $0 $0
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Document Links

990
Filed on Nov. 16, 2020

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending Dec.
2018

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$951,240
Expenses
$576,796
Net Income
$374,444
Net Assets
$262,727
Notable Sources of Revenue Percent of Total Revenue
Contributions $527
0.1%
Program Services $950,713
99.9%
Investment Income $0
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $95,431
16.5%
Professional Fundraising Fees $0
Other Salaries and Wages $19,067
3.3%
Assets/Debt
Total Assets $702,458
Total Liabilities $439,731
Net Assets $262,727
Compensation
Key Employees and Officers Compensation Related Other
Otto Keklinen (Past Ceo) $67,855 $0 $14,174
Michael Howard (Director & Ceo) $13,402 $0 $0
Michael Widenius (Director) $0 $0 $0
Barry Abrahamson (Director) $0 $0 $0
Espen Hkonsen (Director) $0 $0 $0
Sergei Golubchik (Director) $0 $0 $0
Fangxin Lou (Director) $0 $0 $0
Qinglin Zhang (Director) $0 $0 $0
Sudhakar Sannakkayala (Director) $0 $0 $0
Todd Boyd (Director) $0 $0 $0
Eric Herman (Chairman) $0 $0 $0
+ View more people

Document Links

990
Filed on Nov. 15, 2019

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2017

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$499,436
Expenses
$351,287
Net Income
$148,149
Net Assets
-$111,717
Notable Sources of Revenue Percent of Total Revenue
Contributions $476,952
95.5%
Program Services $22,484
4.5%
Investment Income $0
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $35,379
10.1%
Professional Fundraising Fees $0
Other Salaries and Wages $12,520
3.6%
Assets/Debt
Total Assets $268,108
Total Liabilities $379,825
Net Assets -$111,717
Compensation
Key Employees and Officers Compensation Related Other
Otto Keklinen (Secretary) $35,379 $0 $0
Michael Howard (Director) $0 $0 $0
Michael Widenius (Director) $0 $0 $0
Espen Hkonsen (Director) $0 $0 $0
Sergei Golubchik (Director) $0 $0 $0
Eric Herman (Chairman) $0 $0 $0
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Document Links

990
Filed on Nov. 13, 2018

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2016

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$269,704
Expenses
$287,371
Net Income
-$17,667
Net Assets
-$259,866
Notable Sources of Revenue Percent of Total Revenue
Contributions $261,938
97.1%
Program Services $7,766
2.9%
Investment Income $0
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $7,092
2.5%
Professional Fundraising Fees $0
Other Salaries and Wages $6,323
2.2%
Assets/Debt
Total Assets $129,315
Total Liabilities $389,181
Net Assets -$259,866
Compensation
Key Employees and Officers Compensation Related Other
Michael Widenius (Director) $7,092 $0 $0
Michael Howard (Director) $0 $0 $0
Espen Hakonsen (Director) $0 $0 $0
Sergei Golubchik (Director) $0 $0 $0
Otto Kekalainen (Secretary) $0 $0 $0
Eric Herman (Chairman) $0 $0 $0
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Document Links

990
Filed on Nov. 15, 2017

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2015

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$279,028
Expenses
$290,999
Net Income
-$11,971
Net Assets
-$242,199
Notable Sources of Revenue Percent of Total Revenue
Contributions $272,828
97.8%
Program Services $6,200
2.2%
Investment Income $0
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $35,598
12.2%
Professional Fundraising Fees $0
Other Salaries and Wages $22,787
7.8%
Assets/Debt
Total Assets $56,335
Total Liabilities $298,534
Net Assets -$242,199
Compensation
Key Employees and Officers Compensation Related Other
Michael Widenius (Cto) $35,598 $0 $0
Espen Hakonsen (Director) $0 $0 $0
Sergei Golubchik (Director) $0 $0 $0
Jeremy Zawodney (Director) $0 $0 $0
Eric Herman (Director) $0 $0 $0
Rasmus Johansson (Chairman) $0 $0 $0
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990
Filed on Nov. 8, 2016

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending Dec.
2013

No Extracted Financial Data

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

Document Links

990

Primary tax return for a nonprofit’s activities, finances, and governance

PDF

About This Data

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.

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About Nonprofit Explorer

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.

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