Virginia · Nonprofit
SOCIETY OF NEUROINTERVENTIONAL SURGERY
SOCIETY OF NEUROINTERVENTIONAL SURGERY (Virginia) receives grants from 2 organizations whose IRS filings report $44,500 to it, the largest being NIEKRO ANEURYSM AND AVM FOUNDATION ($40,000). 2 of them have funded it in more than one year.
- Revenue FY2024
- $5.0M
- Funders on record
- 2
- Grants received
- $45k
- Net assets
- $6.4M
What Society of Neurointerventional Surgery does
Mission
The society is organized and operated exclusively to promote excellence in patient care, provide education, support research, influence health care policy, and foster growth of neurointerventional surgical procedures throughout the united states.
As stated on its FY2024 Form 990.
Program
The society (snis) has over 1400 neurointerventional surgeons as members and exists to advance the knowledge and development of neurointerventional surgery. In 2024 we held our annual educational meeting where over 1,000 attendees gather to learn the latest in best practices for neurointerventional surgery.we also hold monthly educational webinars.our get ahead of stroke program is a national public education initiative to improve systems of care for stroke patients.
The program described on its FY2024 Form 990.
The organization over time
Each line starts at 100 in 2017, so what you read is the shape rather than the size: 150 means half as much again as 2017, 50 means half. The number beside each label in the key is where it ended.
Balance sheet
Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2020 to 2021, from $5.5M to $7.1M (+29%).
How it's funded, over time
Each bar is one year's revenue split into where it came from, and every bar is the same height — these are shares, not amounts, so a year that raised twice as much looks the same size. Hover a bar for the split.
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 2 of the last 8 reported years ran a deficit.
reserve
Leadership and staff
The officers, directors, trustees and key employees listed on each return. Joined and no longer listed compare each filing with the year before, matching people by surname and first initial; a year after a gap, or a roster under three people, has no comparison.
Chief executive
Marie Denslow
Executive director
As listed on its FY2024 Form 990.
The chief executive listed changed between the FY2019 and FY2020 filings.
Who funds it, year by year
2017 → 2023: the base held at 1 funder, grant income rose $1k → $20k.
From the IRS filings of SOCIETY OF NEUROINTERVENTIONAL SURGERY’s funders (the co-funder graph). Association, not causation. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How concentrated its funding is
SOCIETY OF NEUROINTERVENTIONAL SURGERY leans on a few funders — its largest provides 90% of grant income and the top three 100%; half comes from just 1 funder.
the vertical line marks half of all grant income — 1 funder to its left
90% of the income these shares are computed over arrives through pass-through sponsors or from payers whose filings do not say what kind of payment it is. Concentration is still measured over all of it, because the money is real; what it does not support is a claim about how many institutions have chosen to fund SOCIETY OF NEUROINTERVENTIONAL SURGERY.
Largest funder’s share by year: 2017 100% · 2018 100% · 2022 100% · 2023 100% — broadly stable.
“Effective funders” = inverse Herfindahl index (1 / Σ shareᵢ²) — the number of equal-sized funders that would give the same concentration. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Where its funders are
SOCIETY OF NEUROINTERVENTIONAL SURGERY draws 100% of its grant income from funders outside Virginia, across 2 states in all.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Organizations like SOCIETY OF NEUROINTERVENTIONAL SURGERY
Organizations whose mission and program text most resemble this one, by semantic similarity over every organization in the US filings — the closest peers, and often the clearest route to shared or prospective funders.
In Virginia
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Governance
Footprint & structure
Files a return copy in 1 state
Part of a family of 1 related entity
- Snis Foundation · exempt
Screen this organization
A dated, signed PDF of the compliance screen for SOCIETY OF NEUROINTERVENTIONAL SURGERY: IRS status (Business Master File, Publication 78, auto-revocation), the OFAC sanctions lists, the Internal Revenue Bulletin, and California registration, with the Rev. Proc. 2018-32 §8.01 reliance elements stated element by element. Generated from the current files at the moment you download it.
Screens are triage, not determinations; a source that cannot be read reports not screened, never clear. Screen this nonprofit · How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds SOCIETY OF NEUROINTERVENTIONAL SURGERY?
- SOCIETY OF NEUROINTERVENTIONAL SURGERY (Virginia) receives grants from 2 organizations whose IRS filings report $44,500 to it, the largest being NIEKRO ANEURYSM AND AVM FOUNDATION ($40,000). 2 of them have funded it in more than one year.
- How many funders does SOCIETY OF NEUROINTERVENTIONAL SURGERY have?
- IRS filings report 2 organizations giving $44,500 in grants to SOCIETY OF NEUROINTERVENTIONAL SURGERY, 2 of which have funded it in more than one year.
- Who is the largest funder of SOCIETY OF NEUROINTERVENTIONAL SURGERY?
- NIEKRO ANEURYSM AND AVM FOUNDATION is the largest funder on record, with $40,000 in grants. The full list of funders is on this page.
- How can an organization like SOCIETY OF NEUROINTERVENTIONAL SURGERY find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Virginia. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
Play a game about who funds Society of Neurointerventional Surgery →
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2024 (financials across 2017–2024), and the filings of 2 funders that report grants to it. “On record” means captured in the filings we have parsed — a funder that does not e-file, or whose grant detail is not itemized, will not appear. Filings run roughly 12–24 months behind. Trends on this page end at FY2023, the last fiscal year that has finished arriving; later years are shown and marked, and move no figure. Data on this page was exported October 14, 2026. What this page cannot tell you · view filing