Civic Intelligence

The Oeis Foundation Inc.

EIN 30-0562250 • 501(c)3 • Monroeville, PA

Pub. 78 Eligible990-N CoverageNTEE A30

Profile

Maintain the OEIS website (oeis.org), used by scientists world-wide.

2340 Saunders Station RoadMonroeville, PA 15146

oeisf.org

Siviq Scores

Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.

Liabilities / Assets

59th percentile

0.00x

Tied with the lowest-debt nonprofits in its peer group.

501(c)3 • <$500k nonprofits • Source year 2022

Liabilities / Revenue

61st percentile

0.00x

Tied with the lowest-debt nonprofits in its peer group.

501(c)3 • <$500k nonprofits • Source year 2022

Net Margin

94th percentile

67%

Higher net margin than 94% of similar nonprofits.

501(c)3 • <$500k nonprofits • Source year 2022

Top Officer Pay

Score unavailable

No value available

No filing with officer rows is available for this organization yet.

Asset Growth

47th percentile

-3.3%

Faster asset growth than 47% of similar nonprofits.

501(c)3 • <$500k nonprofits • Annualized from 2021 to 2022

Revenue Growth

12th percentile

-66%

Faster revenue growth than 12% of similar nonprofits.

501(c)3 • <$500k nonprofits • Annualized from 2021 to 2022

Balance Sheet
Liabilities / Assets59th percentile

Assets

Up

$3,479,140

Up $355,018 (+11%) from 2024

Liabilities

Flat

$0

Flat from 2024

Net Assets

Up

$3,479,140

Up $355,018 (+11%) from 2024

Operations
Liabilities / Revenue61st percentileNet Margin94th percentile

Revenue

Down

$111,681

Down $2,359,366 (-95%) from 2024

Expenses

Up

$145,188

Up $122,268 (+533%) from 2024

Net Income

Down

-$33,507

Down $2,481,634 (-101%) from 2024

Trend Graphs

Balance Sheet Trend

Asset Growth47th percentile

Grouped bars show assets, liabilities, and net assets across loaded filings.

$4.0M$3.0M$2.0M$1.0M$0Assets 2021: $402,770Liabilities 2021: $0Net Assets 2021: $402,7702021Assets 2022: $389,391Liabilities 2022: $0Net Assets 2022: $389,3912022Assets 2023: $464,312Liabilities 2023: $0Net Assets 2023: $464,3122023Assets 2024: $3,124,122Liabilities 2024: $0Net Assets 2024: $3,124,1222024Assets 2025: $3,479,140Liabilities 2025: $0Net Assets 2025: $3,479,1402025

Highlighted filing

2025

Assets$3,479,140
Liabilities$0
Net Assets$3,479,140
Open 2025 Filing

Operations Trend

Revenue Growth12th percentile

Revenue, expenses, and net income by year, with the latest filing highlighted.

$3.0M$2.0M$1.0M$0-$1.0MRevenue 2021: $192,523Expenses 2021: $20,037Net Income 2021: $172,4862021Revenue 2022: $65,574Expenses 2022: $21,809Net Income 2022: $43,7652022Revenue 2023: $40,030Expenses 2023: $24,985Net Income 2023: $15,0452023Revenue 2024: $2,471,047Expenses 2024: $22,920Net Income 2024: $2,448,1272024Revenue 2025: $111,681Expenses 2025: $145,188Net Income 2025: -$33,5072025

Highlighted filing

2025

Revenue$111,681
Expenses$145,188
Net Income-$33,507
Open 2025 Filing

Filings

Most recent year

2025 • Form 990Detailed filing. Detailed filing data is available for this year.

Open filing
Assets
$3,479,140
Liabilities
$0
Net assets
$3,479,140
Revenue
$111,681
Expenses
$145,188
Net income
-$33,507
Balance SheetOperations
YearAssetsLiabilitiesNet AssetsRevenueExpensesNet Income
2025Detailed filing. Detailed filing data is available for this year.$3.48$0.00$3.48$0.11$0.15$0.03
2024Detailed filing. Detailed filing data is available for this year.$3.12$0.00$3.12$2.47$0.02$2.45
2023Detailed filing. Detailed filing data is available for this year.$0.46$0.00$0.46$0.04$0.02$0.02
2022Detailed filing. Detailed filing data is available for this year.$0.39$0.00$0.39$0.07$0.02$0.04
2021Detailed filing. Detailed filing data is available for this year.$0.40$0.00$0.40$0.19$0.02$0.17
Latest Filing Detail
Jump To
Filing Snapshot
Filing Period
Jan 1, 2025 to Dec 31, 2025
Signed
Mar 7, 2026
Return Version
2025v4.0
Gross Receipts
$111,681
Mission and Program Overview

Mission

Maintain the OEIS website (oeis.org), used by scientists world-wide.

Balance Sheet Detail
LineBeginningEndChange
Assets
Rtn Earn Endowment Incm Other Fnds$3,124,122$3,479,140▲ $355,018
Investments in Publicly Traded Securities$3,057,442$3,425,468▲ $368,026
Cash and Non-Interest-Bearing Accounts$46,555$33,539▼ $13,016
Savings and Temporary Cash Investments$20,125$20,133▲ $8
Accounts Receivable$0$0→ $0
Other Notes and Loans Receivable, Net$0$0→ $0
Pledges and Grants Receivable$0$0→ $0
Receivable From Disqualified Prsn$0$0→ $0
Receivables From Officers Etc$0$0→ $0
Investments Other Securities-$0-
Investments Program Related-$0-
Pd in Cap Srpls Land Bldg Eqp Fund$0$0→ $0
Cap Stk Tr Prin Current Funds$0$0→ $0
Intangible Assets-$0-
Inventories for Sale or Use$0$0→ $0
Loans From Officers Directors$0$0→ $0
Prepaid Expenses and Deferred Charges$0$0→ $0
Total Assets$3,124,122$3,479,140▲ $355,018
Other Assets Total-$0-
Liabilities
Accounts Payable and Accrued Expenses$0$0→ $0
Grants Payable$0$0→ $0
Mortgage Notes Payable Secured by Investment Property$0$0→ $0
Unsecured Notes Loans Payable$0$0→ $0
Other Liabilities$0--
Deferred Revenue$0$0→ $0
Escrow Account Liability$0$0→ $0
Tax Exempt Bond Liabilities$0$0→ $0
Total Liabilities$0$0→ $0
Net Assets / Fund Balance
Total Net Assets Fund Balance$3,124,122$3,479,140▲ $355,018
Total Liabilities and Net Assets / Fund Balance$3,124,122$3,479,140▲ $355,018
Compensation and Service Providers
Top Officer PayScore unavailable

Employees

NameTitleFull / Part TimeOtherTotal
Sean IrvineTrusteeFT$72,733$72,733

Board Members and Trustees

NameTitle
N J A SloaneChairman
Russell S CoxPresident
Marc LeBrunVice President
Bridget Tenner RagnarssonTrustee
Charles R GreathouseTrustee
David L ApplegateTrustee
Harvey P DaleTrustee
Joerg ArndtTrustee
Lara K PudwellTrustee
Ray ChandlerTrustee
Simon PlouffeTrustee
Tom DuffTrustee
Alexandar D HealySecretary
Robert R PriceTreasurer
Revenue and Support

Revenue Composition

Contributions and Grants
$52,196
Program Service Revenue
$0
Investment Income
$59,485
Other Revenue
$0
All Other Contributions
$52,196
Change in Net Assets
$-33,507
Expenses and Functional Allocation

Major Expense Lines

Line ItemAmount
Salaries, Compensation, and Employee Benefits$81,689
Other Expenses$63,499
Grants and Similar Amounts Paid$0
Professional Fundraising Fees$0
Total Fundraising Expense$0

Functional Expense Allocation

Line ItemProgramManagementFundraisingTotal
Current Officers, Directors, Trustees, and Key Employees$81,053$0$0$81,053
Fees for Services Legal$37,453$0$0$37,453
Fees for Services Management$15,155$0$0$15,155
Information Technology$8,861$0$0$8,861
Office Expenses$0$1,026-$1,026
Insurance$0$1,004$0$1,004
Payroll Taxes$636$0$0$636
Total Functional Expenses$143,158$2,030$0$145,188
Fundraising, Events, and Gaming
Fundraising activities
No
Gaming activities
No
Professional fundraiser used
No

Fundraising and Gaming Totals

Line ItemAmount
Professional Fundraising Fees$0
Political and Lobbying Activity
Political campaign activity
No
Lobbying activity
No
Subject to proxy tax
No
Insider Transactions and Loans

Loans and Receivables

Line ItemBeginningEndChange
Loans from Officers, Directors, Trustees, and Key Employees$0$0→ $0
Receivables from Disqualified Persons$0$0→ $0
Receivables from Officers, Directors, Trustees, and Key Employees$0$0→ $0
Governance and Compliance

Governance Checklist

Compiled or reviewed by an accountant
No
Audit committee
No
Backup withholding compliance
Yes
Business relationship with 35% controlled entity
No
Business relationship with family members
No
Business relationship with organization members
No
Material changes to governing documents
No
Compensation from other sources disclosed
No
CEO compensation reviewed
No
Other officer compensation reviewed
No
Conflict-of-interest policy
No
Audited financial statements prepared
No
Key decisions subject to board approval
No
Management duties delegated
No

Governance Explanations

Form 990, Part VI, Section B, Line 11B

“Draft made available to Officers and Trustees by email. Final return published on web site.”

Form 990, Part VI, Section C, Line 19

“Published on the organization web site.”

Form 990, Part VII, Section A, Line 1A

“We employ Michael De Vlieger, a US resident, directly; he is the one employee on our W-3. All compensation to Sean Irvine, a New Zealand citizen and resident, was paid under contract with a third-party (Deel Inc).”

Filing and Contact Details

Filer

Filer Name
The Oeis Foundation Inc
EIN
30-0562250
Phone
4127383782
Address
820 BEAR TAVERN ROAD, WEST TRENTON, NJ 08628

Signing Officer

Name
Robert Price
Title
Treasurer
Phone
4127383782
Signed
2026-03-07

Organization Details

Principal Officer
N J A Sloane
Formed
2009
Legal Domicile
Nj
Voting Board Members
15
Independent Board Members
15
Employees
1
Volunteers
35
Raw XML AppendixShowing 400 of 573 raw XML fields

This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.

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IRS990/GainOrLossGrp/OtherAmt00
IRS990/GainOrLossGrp/SecuritiesAmt00
IRS990/GamingActivitiesInd00
IRS990/GoverningBodyVotingMembersCnt015
IRS990/GovernmentGrantsAmt00
IRS990/GrantAmt00
IRS990/GrantsPayableGrp/BOYAmt00
IRS990/GrantsPayableGrp/EOYAmt00
IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt00
IRS990/GrantsToDomesticIndividualsGrp/TotalAmt00
IRS990/GrantsToDomesticOrgsGrp/ProgramServicesAmt00
IRS990/GrantsToDomesticOrgsGrp/TotalAmt00
IRS990/GrantsToIndividualsInd00
IRS990/GrantsToOrganizationsInd00
IRS990/GrantToRelatedPersonInd00
IRS990/GrossReceiptsAmt0111681
IRS990/GroupReturnForAffiliatesInd00
IRS990/IncludeFIN48FootnoteInd00
IRS990/IncmFromInvestBondProceedsGrp/ExclusionAmt00
IRS990/IncmFromInvestBondProceedsGrp/RelatedOrExemptFuncIncomeAmt00
IRS990/IncmFromInvestBondProceedsGrp/TotalRevenueColumnAmt00
IRS990/IncmFromInvestBondProceedsGrp/UnrelatedBusinessRevenueAmt00
IRS990/IndependentAuditFinclStmtInd00
IRS990/IndependentVotingMemberCnt015
IRS990/IndivRcvdGreaterThan100KCnt00
IRS990/IndoorTanningServicesInd00
IRS990/InfoInScheduleOPartVIIInd0X
IRS990/InfoInScheduleOPartVIInd0X
IRS990/InformationTechnologyGrp/FundraisingAmt00
IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt00
IRS990/InformationTechnologyGrp/ProgramServicesAmt08861
IRS990/InformationTechnologyGrp/TotalAmt08861
IRS990/InsuranceGrp/FundraisingAmt00
IRS990/InsuranceGrp/ManagementAndGeneralAmt01004
IRS990/InsuranceGrp/ProgramServicesAmt00
IRS990/InsuranceGrp/TotalAmt01004
IRS990/IntangibleAssetsGrp/EOYAmt00
IRS990/InterestGrp/FundraisingAmt00
IRS990/InterestGrp/ManagementAndGeneralAmt00
IRS990/InterestGrp/ProgramServicesAmt00
IRS990/InterestGrp/TotalAmt00
IRS990/InventoriesForSaleOrUseGrp/BOYAmt00
IRS990/InventoriesForSaleOrUseGrp/EOYAmt00
IRS990/InvestmentExpenseAmt00
IRS990/InvestmentIncomeGrp/ExclusionAmt00
IRS990/InvestmentIncomeGrp/RelatedOrExemptFuncIncomeAmt059485
IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt059485
IRS990/InvestmentIncomeGrp/UnrelatedBusinessRevenueAmt00
IRS990/InvestmentInJointVentureInd00
IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt00
IRS990/InvestmentsProgramRelatedGrp/EOYAmt00
IRS990/InvestmentsPubTradedSecGrp/BOYAmt03057442
IRS990/InvestmentsPubTradedSecGrp/EOYAmt03425468
IRS990/IRPDocumentCnt00
IRS990/IRPDocumentW2GCnt00
IRS990/LegalDomicileStateCd0NJ
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IRS990/LoansFromOfficersDirectorsGrp/BOYAmt00
IRS990/LoansFromOfficersDirectorsGrp/EOYAmt00
IRS990/LobbyingActivitiesInd00
IRS990/LocalChaptersInd00
IRS990/MaterialDiversionOrMisuseInd00
IRS990/MembershipDuesAmt00
IRS990/MembersOrStockholdersInd00
IRS990/MethodOfAccountingAccrualInd0X
IRS990/MinutesOfCommitteesInd01
IRS990/MinutesOfGoverningBodyInd01
IRS990/MissionDesc0Maintain the OEIS website (oeis.org), used by scientists world-wide.
IRS990/MoreThan5000KToIndividualsInd00
IRS990/MoreThan5000KToOrgInd00
IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt00
IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt00
IRS990/NetAssetsOrFundBalancesBOYAmt03124122
IRS990/NetAssetsOrFundBalancesEOYAmt03479140
IRS990/NetUnrelatedBusTxblIncmAmt00
IRS990/NetUnrlzdGainsLossesInvstAmt0388525
IRS990/NoncashContributionsAmt00
IRS990/NondeductibleContributionsInd00
IRS990/OccupancyGrp/FundraisingAmt00
IRS990/OccupancyGrp/ManagementAndGeneralAmt00
IRS990/OccupancyGrp/ProgramServicesAmt00
IRS990/OccupancyGrp/TotalAmt00
IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt01026
IRS990/OfficeExpensesGrp/ProgramServicesAmt00
IRS990/OfficeExpensesGrp/TotalAmt01026
IRS990/OfficerMailingAddressInd00
IRS990/OperateHospitalInd00
IRS990/Organization501c3Ind0X
IRS990/OrgDoesNotFollowFASB117Ind0X
IRS990/OtherAssetsTotalGrp/EOYAmt00
IRS990/OtherChangesInNetAssetsAmt00
IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt00
IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt00
IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt00
IRS990/OtherEmployeeBenefitsGrp/TotalAmt00
IRS990/OtherLiabilitiesGrp/BOYAmt00
IRS990/OtherRevenueTotalAmt00
IRS990/OtherSalariesAndWagesGrp/FundraisingAmt00
IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt00
IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt00
IRS990/OtherSalariesAndWagesGrp/TotalAmt00
IRS990/OthNotesLoansReceivableNetGrp/BOYAmt00
IRS990/OthNotesLoansReceivableNetGrp/EOYAmt00
IRS990/OwnWebsiteInd0X
IRS990/PartialLiquidationInd00
IRS990/PaymentsToAffiliatesGrp/FundraisingAmt00
IRS990/PaymentsToAffiliatesGrp/ManagementAndGeneralAmt00
IRS990/PaymentsToAffiliatesGrp/ProgramServicesAmt00
IRS990/PaymentsToAffiliatesGrp/TotalAmt00
IRS990/PayrollTaxesGrp/FundraisingAmt00
IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt00
IRS990/PayrollTaxesGrp/ProgramServicesAmt0636
IRS990/PayrollTaxesGrp/TotalAmt0636
IRS990/PdInCapSrplsLandBldgEqpFundGrp/BOYAmt00
IRS990/PdInCapSrplsLandBldgEqpFundGrp/EOYAmt00
IRS990/PensionPlanContributionsGrp/FundraisingAmt00
IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt00
IRS990/PensionPlanContributionsGrp/ProgramServicesAmt00
IRS990/PensionPlanContributionsGrp/TotalAmt00
IRS990/PledgesAndGrantsReceivableGrp/BOYAmt00
IRS990/PledgesAndGrantsReceivableGrp/EOYAmt00
IRS990/PoliticalCampaignActyInd00
IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt00
IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt00
IRS990/PrincipalOfficerNm0N J A Sloane
IRS990/PriorPeriodAdjustmentsAmt00
IRS990/ProfessionalFundraisingInd00
IRS990/ProgSrvcAccomActy2Grp/Desc0Reach out to scientists world-wide to introduce them to the OEIS.
IRS990/ProgSrvcAccomActy2Grp/ExpenseAmt011722
IRS990/ProgSrvcAccomActy2Grp/GrantAmt00
IRS990/ProgSrvcAccomActy2Grp/RevenueAmt00
IRS990/ProhibitedTaxShelterTransInd00
IRS990/PYBenefitsPaidToMembersAmt00
IRS990/PYContributionsGrantsAmt02460623
IRS990/PYExcessBenefitTransInd00
IRS990/PYGrantsAndSimilarPaidAmt00
IRS990/PYInvestmentIncomeAmt010424
IRS990/PymtTravelEntrtnmntPubOfclGrp/FundraisingAmt00
IRS990/PymtTravelEntrtnmntPubOfclGrp/ManagementAndGeneralAmt00
IRS990/PymtTravelEntrtnmntPubOfclGrp/ProgramServicesAmt00
IRS990/PymtTravelEntrtnmntPubOfclGrp/TotalAmt00
IRS990/PYOtherExpensesAmt013964
IRS990/PYOtherRevenueAmt00
IRS990/PYProgramServiceRevenueAmt00
IRS990/PYRevenuesLessExpensesAmt02448127

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