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STONY BROOK SURGICAL ASSOCIATES UNIVERSITY FACULTY PRACTICE CORP

EIN 11-2552333 STONY BROOK, NY

Largest nonprofits in New York

Revenue 2023
$65,571,174
Expenses 2023
$68,901,847

Program services were 91.8% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection
03
NTEE code
E20
Classification
1000
Street
PO BOX 1554

These codes are the IRS's own and are shown exactly as filed. What each one means is in the Business Master File documentation (opens in a new tab).

Other organizations at this address

19 other organizations in the IRS Business Master File list the same street address. matched by us

We match the street line and ZIP code as the IRS gives them, ignoring case and outer spaces and nothing else, so "AVE" and "AVENUE" count as different streets and this list can miss some. A shared address can mean related organizations or a shared office, but it can also be a registered agent, a mail drop or a service provider holding mail for unrelated clients. It is not, by itself, evidence that two organizations are connected.

Mission and programs · 2023

Mission

PROVIDE CLINICAL INSTRUCTION TO AND SUPERVISION OF MEDICAL SCHOOL STUDENTS, INTERNS AND RESIDENTS AND, INCIDENT THERETO, RENDERING PROFESSIONAL SERVICES.

  • THE ORGANIZATION PROVIDES SERVICES IN THE FIELD OF SURGERY TO PATIENTS AND PROVIDES CLINICAL INSTRUCTION TO AND SUPERVISION OF SCHOOL OF MEDICINE STUDENTS AND HOSPITAL RESIDENTS.

    Expenses $63,260,427 · Revenue $65,474,034

As filed on the 2023 return.

Officers and directors · 2023

As listed in Part VII of the 2023 return, in the order the filer printed them. Each return names its own; this is not a roster the organization keeps with us.

  • Alexander Dagum

    DIRECTOR/SECRETARY/TREASURER

    Total calculated
    $1,032,390
    From this org
    $968,994
    From related orgs
    $0
    Other
    $63,396
    Hours/week
    40 + 10 related

    Schedule J breakdown matched by us

    Base
    $928,134
    Bonus
    $38,250
    Other
    $2,610
    Deferred
    $39,600
    Nontaxable benefits
    $1,258 + $22,538 related
    Filer's total
    $1,009,852 + $22,538 related
  • Apostolos Tassiopoulos

    President & Director

    Total calculated
    $1,629,894
    From this org
    $1,154,599
    From related orgs
    $367,221
    Other
    $108,074
    Hours/week
    40 + 10 related

    Schedule J breakdown matched by us

    Base
    $1,062,158 + $367,221 related
    Bonus
    $89,831
    Other
    $2,610
    Deferred
    $39,600 + $44,850 related
    Nontaxable benefits
    $1,086 + $22,538 related
    Filer's total
    $1,195,285 + $434,609 related
  • Konstantinos Spaniolas

    DIRECTOR

    Total calculated
    $1,117,479
    From this org
    $951,874
    From related orgs
    $92,435
    Other
    $73,170
    Hours/week
    40 + 10 related

    Schedule J breakdown matched by us

    Base
    $812,635 + $92,435 related
    Bonus
    $136,629
    Other
    $2,610
    Deferred
    $39,600 + $9,244 related
    Nontaxable benefits
    $1,788 + $22,538 related
    Filer's total
    $993,262 + $124,217 related
  • Antonios Gasparis

    SURGEON

    Total calculated
    $1,514,661
    From this org
    $1,451,524
    From related orgs
    $0
    Other
    $63,137
    Hours/week
    40 + 10 related

    Schedule J breakdown matched by us

    Base
    $807,568
    Bonus
    $641,346
    Other
    $2,610
    Deferred
    $39,600
    Nontaxable benefits
    $999 + $22,538 related
    Filer's total
    $1,492,123 + $22,538 related
  • Duc Bui

    SURGEON

    Total calculated
    $1,467,946
    From this org
    $1,299,990
    From related orgs
    $92,760
    Other
    $75,196
    Hours/week
    40 + 10 related

    Schedule J breakdown matched by us

    Base
    $804,551 + $92,760 related
    Bonus
    $492,829
    Other
    $2,610
    Deferred
    $39,600 + $12,059 related
    Nontaxable benefits
    $999 + $22,538 related
    Filer's total
    $1,340,589 + $127,357 related
  • Henry Tannous

    SURGEON

    Total calculated
    $1,532,796
    From this org
    $1,468,872
    From related orgs
    $0
    Other
    $63,924
    Hours/week
    40 + 10 related

    Schedule J breakdown matched by us

    Base
    $1,429,873
    Bonus
    $36,389
    Other
    $2,610
    Deferred
    $39,600
    Nontaxable benefits
    $1,786 + $22,538 related
    Filer's total
    $1,510,258 + $22,538 related
  • James Vosswinkel

    SURGEON

    Total calculated
    $1,137,538
    From this org
    $721,928
    From related orgs
    $311,909
    Other
    $103,701
    Hours/week
    40 + 10 related

    Schedule J breakdown matched by us

    Base
    $690,271 + $311,909 related
    Bonus
    $29,047
    Other
    $2,610
    Deferred
    $39,600 + $40,548 related
    Nontaxable benefits
    $1,015 + $22,538 related
    Filer's total
    $762,543 + $374,995 related
  • Sami Khan

    SURGEON

    Total calculated
    $1,384,754
    From this org
    $1,218,043
    From related orgs
    $91,658
    Other
    $75,053
    Hours/week
    40 + 10 related

    Schedule J breakdown matched by us

    Base
    $948,115 + $91,658 related
    Bonus
    $267,318
    Other
    $2,610
    Deferred
    $39,600 + $11,916 related
    Nontaxable benefits
    $999 + $22,538 related
    Filer's total
    $1,258,642 + $126,112 related
  • Aurora Pryor

    FORMER (till 10/22)

    Total calculated
    $100,444
    From this org
    $69,559
    From related orgs
    $0
    Other
    $30,885
    Hours/week
    0 + 10 related

    Schedule J breakdown matched by us

    Base
    $69,559
    Bonus
    $0
    Other
    $0
    Deferred
    $8,347
    Nontaxable benefits
    $0 + $22,538 related
    Filer's total
    $77,906 + $22,538 related

Compensation is as filed in Part VII: reportable pay from this organization and from related organizations, other compensation, and hours per week. The total, marked calculated, is our sum of the three dollar columns, with a blank column counted as $0; the form itself has no total. On a Form 990-EZ the columns are Part IV's instead, and on a Form 990-PF Part VIII's — compensation, contributions to benefit plans, and expense account — and the total sums those. A Schedule J breakdown is as filed: base pay, bonus, other, deferred compensation and nontaxable benefits from this organization, with any from related organizations beside each, and the filer's own total. It is shown with the Part VII listing of the same name on the same return. The form gives no key between the two, so that pairing is ours, and is marked matched by us. Earlier years are each on their own filing page.

Filings

  • 2023
    Revenue
    $65,571,174
    Expenses
    $68,901,847
    Contributions
    $0
    Grants paid
    $0
  • 2022
    Revenue
    $69,046,836
    Expenses
    $68,607,824
    Contributions
    $0
    Grants paid
    $0

The four totals the IRS asks for on Part I of the Form 990, as filed. A dash means the figure was not present on the return — not that it was zero.

Other returns filed

  • 2021 · 990

    Revenue
    $57,321,655
    Expenses
    $59,189,953
    Assets (EOY)
    $7,340,357
  • 2020 · 990

    Revenue
    $60,003,564
    Expenses
    $55,311,238
    Assets (EOY)
    $6,226,375
  • 2019 · 990

    Revenue
    $52,766,373
    Expenses
    $54,064,510
    Assets (EOY)
    $6,298,399
  • 2018 · 990

    Revenue
    $56,927,801
    Expenses
    $57,681,918
    Assets (EOY)
    $7,610,251
  • 2017 · 990

    Revenue
    $54,881,002
    Expenses
    $54,254,855
    Assets (EOY)
    $8,364,368
  • 2016 · 990

    Revenue
    $50,598,334
    Expenses
    $48,370,802
    Assets (EOY)
    $7,738,221
  • 2015 · 990

    Revenue
    $46,494,190
    Expenses
    $49,561,034
    Assets (EOY)
    $5,513,691
  • 2014 · 990

    Revenue
    $39,285,568
    Expenses
    $38,329,389
    Assets (EOY)
    $8,580,535
  • 2013 · 990

    Revenue
    $38,332,449
    Expenses
    $35,695,058
    Assets (EOY)
    $7,621,356
  • 2012 · 990

    Revenue
    not reported
    Expenses
    $33,847,092
    Assets (EOY)
    $4,983,963

Nonprofiteer parses Forms 990, 990-EZ and 990-PF, in a window of recent tax years. These returns are recorded from the IRS e-file index, so their figures were extracted by that index rather than read from the return here — treat them as a different source from the filings above, not as more of the same record. A dash means the index carries no figure; Form 990-T listings carry none at all. Showing the 10 most recent; the API carries the rest.

Grants made

No itemized grants to organizations. Schedule I is filed only by organizations that granted more than $5,000 to a recipient, so most filers have none.

Grants received

Related organizations

From Schedule R Part II, where a filer lists the tax-exempt organizations it is related to by control. It does not record shared board members or money.

Declared on its 2023 return

Taxable family

From Schedule R Parts I, III and IV: entities that legally are the filer, and taxable partnerships, corporations and trusts it is related to. These record ownership and control, not shared board members or money.

Related partnerships on its 2023 return

  • SB HLTHCARE IPA LLC

    Related · HEALTHCARE · NY

Related corporations and trusts on its 2023 return

  • NICOLLS INDEMNITY SOLUTIONS SPC

    C Corporation · SELF-INSURANCE · CJ

Other IRS files

Auto-Revocation List

Not listed. The IRS publishes this list for organizations whose exemption was automatically revoked for failing to file for three consecutive years.

Publication 78

Listed as of 13 October 2026, under deductibility PC.

These are two separate IRS files on two separate schedules, shown as published and not reconciled with each other. Neither is a statement about whether a contribution is deductible today: 19,245 organizations appear in Publication 78 while the IRS's own revocation file lists them as currently revoked, more than half of those revoked before 2019. Absence from Publication 78 is evidence of nothing, and presence is not evidence either. Verify current status with the IRS before relying on it.

What this page reflects

The registration facts above come from the IRS Business Master File published 13 October 2026 and read 1 November 2026, for every organization at once. Returns through tax year 2023, the newest we have parsed for this organization.