Koroluk Foundation

EIN 36-4323606 • Naperville, IL

Pub. 78 Eligible

3943 Littlestone CircleNaperville, IL 60564

Siviq Scores

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

0.00x

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

$5M-$10M nonprofits • Source year 2024

0.00x

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

$5M-$10M nonprofits • Source year 2024

83%

Higher net margin than 95% of similar nonprofits.

$5M-$10M nonprofits • Source year 2024

Higher top officer pay than 33% of similar nonprofits.

$5M-$10M nonprofits • Source year 2025

28%

Faster asset growth than 87% of similar nonprofits.

$5M-$10M nonprofits • Annualized from 2023 to 2024

556%

Faster revenue growth than 97% of similar nonprofits.

$5M-$10M nonprofits • Annualized from 2023 to 2024

Balance Sheet

Liabilities / Assets24th percentile

Using 2024 Form 990PF data because the latest 2025 filing does not report standard financial totals.

Assets

$5,243,278

Up $1,137,598 (+28%) from 2023

Liabilities

Flat

Flat from 2023

Net Assets

$5,243,278

Up $1,137,598 (+28%) from 2023

Operations

Liabilities / Revenue25th percentile Net Margin95th percentile

Revenue

$1,374,936

Up $1,165,341 (+556%) from 2023

Expenses

Down

$237,338

Down $11,239 (-4.5%) from 2023

Net Income

$1,137,598

Up $1,176,580 (+3018%) from 2023

Trend Graphs

Balance Sheet Trend

Asset Growth87th percentile

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

Latest loaded filing

2024

Assets$5,243,278

Liabilities$0

Net Assets$5,243,278

Open 2024 Filing

Operations Trend

Revenue Growth97th percentile

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

Latest loaded filing

2024

Revenue$1,374,936

Expenses$237,338

Net Income$1,137,598

Open 2024 Filing

Filings

Most recent year

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

Open filing

Assets: -
Liabilities: -
Net assets: -
Revenue: -
Expenses: -
Net income: -

	Balance Sheet			Operations
Year	Assets	Liabilities	Net Assets	Revenue	Expenses	Net Income
2025Detailed filing. Detailed filing data is available for this year.
2024Detailed filing. Detailed filing data is available for this year.	$5.24	$0.00	$5.24	$1.37	$0.24	$1.14
2023Detailed filing. Detailed filing data is available for this year.	$4.11	$0.00	$4.11	$0.21	$0.25	$0.04
2022Detailed filing. Detailed filing data is available for this year.	$4.14	$0.00	$4.14	$0.16	$0.21	$0.06
2021Detailed filing. Detailed filing data is available for this year.	$4.20	$0.00	$4.20	$0.10	$0.22	$0.12
2020Detailed filing. Detailed filing data is available for this year.	$4.32	$0.00	$4.32	$0.17	$0.22	$0.05
2019Detailed filing. Detailed filing data is available for this year.	$4.37	$0.00	$4.37	$0.17	$0.23	$0.05
2018Detailed filing. Detailed filing data is available for this year.	$4.43	$0.00	$4.43	$0.15	$0.23	$0.08

Latest Filing Detail

Jump To

Filing Snapshot

Filing Period: Jan 1, 2025 to Dec 31, 2025
Signed: Apr 21, 2026
Return Version: 2025v4.1

Compensation and Service Providers

Top Officer Pay33rd percentile

Employees

Name	Title	Full / Part Time	Base	Other	Total
Del Marie Koroluk	Treasurer	-	$0	-	-
Theodore Koroluk	President	-	$0	-	-
Aleksandr Kalinin	Director	-	$0	-	-
Theodora Heihn	Secretary	-	$0	-	-

Grants and Assistance

Foundation Grants and Related Investments

Type	Recipient	Purpose	Status	Location	Amount
Paid Grant	-	Church or charity	-	Naperville, IL, US	$265,000

Filing and Contact Details

Filer

Filer Name: Koroluk Foundation
EIN: 36-4323606
Phone: 7608082628
Address: 3943 Littlestone Circle, Naperville, IL 60564

Signing Officer

Name: Theodore Koroluk
Title: President
Signed: 2026-04-21
Discuss with paid preparer: Yes

Preparer

Firm: Gritis & Associates Ltd
Address: 1385 Warren Avenue Suite A, Downers Grove, IL 60515
Preparer: John R Gritis
Phone: 6309643400

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IRS990PF/UndistributedIncomeGrp/ExcessDistriCyovToNextYrAmt	0	1174000
IRS990PF/UndistributedIncomeGrp/ExcessFromCurrentYearAmt	0	265000
IRS990PF/UndistributedIncomeGrp/ExcessFromYear1Amt	0	235000
IRS990PF/UndistributedIncomeGrp/ExcessFromYear2Amt	0	245000
IRS990PF/UndistributedIncomeGrp/ExcessFromYear3Amt	0	211000
IRS990PF/UndistributedIncomeGrp/ExcessFromYear4Amt	0	218000
IRS990PF/UndistributedIncomeGrp/QualifyingDistributionsAmt	0	265000
IRS990PF/UndistributedIncomeGrp/RemainingDistriFromCorpusAmt	0	265000
IRS990PF/UndistributedIncomeGrp/TotalCorpusAmt	0	1396449
IRS990PF/UndistributedIncomeGrp/TotalExcessDistributionCyovAmt	0	1131449
IRS990PF/UndistributedIncomeGrp/TreatedAsDistriFromCorpusAmt	0	0
IRS990PF/UndistributedIncomeGrp/UndistributedIncomeCYAmt	0	0
TaxesSchedule/TaxesDetail/Amt	0	3200
TaxesSchedule/TaxesDetail/Amt	1	15
TaxesSchedule/TaxesDetail/Amt	2	1293
TaxesSchedule/TaxesDetail/CategoryTxt	0	Current year estimated Federal tax
TaxesSchedule/TaxesDetail/CategoryTxt	1	IL State fee
TaxesSchedule/TaxesDetail/CategoryTxt	2	Prior year Federal tax
ReturnHeader/BuildTS	0	2025-03-06 01:10:19Z
ReturnHeader/BusinessOfficerGrp/DiscussWithPaidPreparerInd	0	true
ReturnHeader/BusinessOfficerGrp/PersonNm	0	Theodore Koroluk
ReturnHeader/BusinessOfficerGrp/PersonTitleTxt	0	President
ReturnHeader/BusinessOfficerGrp/SignatureDt	0	2026-04-21
ReturnHeader/Filer/BusinessName/BusinessNameLine1Txt	0	Koroluk Foundation
ReturnHeader/Filer/BusinessNameControlTxt	0	KORO
ReturnHeader/Filer/EIN	0	364323606
ReturnHeader/Filer/PhoneNum	0	7608082628
ReturnHeader/Filer/USAddress/AddressLine1Txt	0	3943 Littlestone Circle
ReturnHeader/Filer/USAddress/CityNm	0	Naperville
ReturnHeader/Filer/USAddress/StateAbbreviationCd	0	IL
ReturnHeader/Filer/USAddress/ZIPCd	0	60564
ReturnHeader/PreparerFirmGrp/PreparerFirmEIN	0	300109918
ReturnHeader/PreparerFirmGrp/PreparerFirmName/BusinessNameLine1Txt	0	Gritis & Associates Ltd
ReturnHeader/PreparerFirmGrp/PreparerUSAddress/AddressLine1Txt	0	1385 Warren Avenue Suite A
ReturnHeader/PreparerFirmGrp/PreparerUSAddress/CityNm	0	Downers Grove
ReturnHeader/PreparerFirmGrp/PreparerUSAddress/StateAbbreviationCd	0	IL
ReturnHeader/PreparerFirmGrp/PreparerUSAddress/ZIPCd	0	60515
ReturnHeader/PreparerPersonGrp/PhoneNum	0	6309643400
ReturnHeader/PreparerPersonGrp/PreparerPersonNm	0	John R Gritis
ReturnHeader/ReturnTs	0	2026-04-21T12:07:52-07:00
ReturnHeader/ReturnTypeCd	0	990PF
ReturnHeader/TaxPeriodBeginDt	0	2025-01-01
ReturnHeader/TaxPeriodEndDt	0	2025-12-31
ReturnHeader/TaxYr	0	2025

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