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Governance Register
US nonprofit · EIN 450342822 · Mandan, NDiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 450342822) - NTEE activity code, address.Board and officers IRS Form 990 annual filings, Part VII (directors, trustees, officers, key employees), read year by year to observe time served.Latest return IRS Form 990 series e-file data - 990EZ for the year to 31 August 2025: assets, liabilities, staff, website, telephone, pay.Finances by year IRS Form 990 e-file data - total revenue and total expenses by tax year.Renewal outlook Computed by Governance Register from the observed filing history and filed revenue. Not a statement that the organisation is recruiting.Deductibility IRS Publication 78 data (code PC), downloaded 18 October 2026.Licence US Federal Government public domain.How we handle data

Mandan Marlins Swim Club's network

5 peoplei5 people on this map.The large node is the subject of this page. Solid lines are what the register itself records (5). Form 990 filings give names without a person identifier; SEC insider filings carry a CIK.

The board

5 listediTime on the board is observed from the annual filings: the IRS files no appointment date, so the bar counts years from the first filing the person appears on - a lower bound, not a filed start date. Names are exactly as filed. The IRS publishes no person identifier, so this edition does not yet link a person across organisations.Time served and departures are observed across annual filings. Observed time served is a lower bound - a member may have joined before the first year on record.
NameRole as filedSinceOn the board
Luke SeidlingVice President2024
2 yrs
Nikki ThomasCompany secretary2024
2 yrs
Philipp SchoellkopfPresident2022
4 yrs
Rhonda StarckTreasurer2024
2 yrs
Sonja OpolkaVice President2022
4 yrs
Under 5 years5 to 6 years6 years or more

Pay and hours

year to 31 August 2025iFrom Part VII of the Form 990: compensation reported for each officer, director, trustee, key employee and highest-paid staff member, and the average hours a week they report. Most board members are unpaid; a blank means nothing was reported. Pay from related organisations is shown separately.
NameTitle as filedHours a weekPay from the organisationRelated organisationsOther
Philipp SchoellkopfPresident10$0
Nikki ThomasSecretary1$0
Luke SeidlingVice President6$0
Rhonda StarckTreasurer10$0

No pay was reported for anyone in Part VII on this return.

About

Legal name
Mandan Marlins Swim Club
EIN
450342822
Address
Po Box 624, Mandan, ND, 58554-0624
State
North Dakota
Activity (NTEE)
N67 Recreation and sports
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
Recreation & Sports
Size band
4 (IRS master file code)
IRS ruling date
1 July 2022
Status
Code 01 (unconditional exemption)
Form 990 filings on record
3, latest 2024
IRS Publication 78
PC (contributions deductible)

Most connected

Longest observed on the filings

≥4years on the filingsPhilipp Schoellkopf
≥4years on the filingsSonja Opolka
≥2years on the filingsLuke Seidling
≥2years on the filingsNikki Thomas

Latest return

year to 31 August 2025iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 31 August 2025. US dollars, as filed.
Total assets
$159k
Total liabilities
$500
Net assets or fund balances
$159k

Filed finances

1 yeariTotals as filed on the IRS Form 990 (revenue and expenses), by tax year.
Tax yearTotal revenueTotal expensesSurplus or deficit
2023$133k$125k$8k

As filed on the IRS Form 990. US dollars.