Neuronetics, Inc. (STIM) Ownership
STIM ownership summary
as of October 17, 2026- Institutions
- 54.0% of shares outstanding
- Insiders
- 32.85% of shares outstanding
- Shares outstanding
- 76.2M
- Float
- 37.2M shares available to trade
- Short interest
- 17.25% 7.1M shares short
- Days to cover
- 5.64 short interest up 13.8% vs prior month
- Institutions 53.96%
- Insiders 32.85%
- Other investors 13.19%
STIM top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Madryn Asset Management, LP | 24.33% | 18.5M | $34.9M | +64,595 (+0.3%) | June 30, 2026 |
| 2 | UBS Group AG | 2.99% | 2.3M | $4.3M | −591,499 (−20.6%) | June 30, 2026 |
| 3 | Wexford Capital LP | 2.63% | 2.0M | $3.8M | +1.3M (+185.7%) | June 30, 2026 |
| 4 | FourWorld Capital Management LLC | 2.29% | 1.7M | $3.3M | +254,820 (+17.1%) | June 30, 2026 |
| 5 | Lane Generational LLC | 2.14% | 1.6M | $3.1M | −141,252 (−8.0%) | June 30, 2026 |
| 6 | Vanguard Capital Management, LLC | 1.98% | 1.5M | $2.8M | −540,878 (−26.4%) | June 30, 2026 |
| 7 | Masters Capital Management LLC | 1.31% | 1.0M | $1.9M | — | June 30, 2026 |
| 8 | AdvisorShares Investments, LLC | 0.97% | 743K | $1.4M | +125,602 (+20.4%) | June 30, 2026 |
| 9 | Ikarian Capital, LLC | 0.92% | 701K | $1.3M | — | June 30, 2026 |
| 10 | BlackRock Inc | 0.78% | 597K | $1.1M | −1.7M (−74.3%) | June 30, 2026 |
| 11 | HighTower Advisors, LLC | 0.74% | 564K | $1.1M | +1,371 (+0.2%) | June 30, 2026 |
| 12 | Marshall Wace Asset Management Ltd | 0.64% | 486K | $915,529 | +485,692 (0.0%) | June 30, 2026 |
| 13 | Geode Capital Management, LLC | 0.60% | 458K | $864,223 | −500,515 (−52.2%) | June 30, 2026 |
| 14 | Citadel Advisors Llc | 0.55% | 422K | $795,287 | +345,306 (+450.8%) | June 30, 2026 |
| 15 | Dauntless Investment Group, LLC | 0.48% | 369K | $695,917 | +99,979 (+37.1%) | June 30, 2026 |
| 16 | State Street Corp | 0.38% | 290K | $547,214 | −552,248 (−65.5%) | June 30, 2026 |
| 17 | Centiva Capital LP | 0.38% | 286K | $538,946 | +116,594 (+68.9%) | June 30, 2026 |
| 18 | Vanguard Fiduciary Trust Co | 0.35% | 265K | $499,024 | +6,700 (+2.6%) | June 30, 2026 |
| 19 | The Goldman Sachs Group Inc | 0.35% | 264K | $497,806 | +30,498 (+13.1%) | June 30, 2026 |
| 20 | JBF Capital, Inc. | 0.31% | 233K | $439,518 | — | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 11 holders added 2.8M shares and 6 cut 4.0M.
STIM top mutual fund and ETF holders
17 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 1.39% | 1.1M | $2.0M | — | August 31, 2026 |
| 2 | AdvisorShares Psychedelics ETF | 1.21% | 924K | $1.7M | — | September 30, 2026 |
| 3 | Fidelity Nasdaq Composite Index | 0.29% | 220K | $415,096 | +175,459 (+392.1%) | August 31, 2026 |
| 4 | Fidelity Extended Market Index | 0.28% | 216K | $407,793 | +16,538 (+8.3%) | August 31, 2026 |
| 5 | EA Bridgeway Ultra-Small Company Mkt ETF | 0.12% | 90K | $170,225 | — | September 30, 2026 |
| 6 | Goldman Sachs Absolute Ret Trckr Instl | 0.11% | 87K | $164,089 | +47,345 (+119.2%) | June 30, 2026 |
| 7 | iShares Micro-Cap ETF | 0.11% | 84K | $158,853 | −581 (−0.7%) | September 30, 2026 |
| 8 | LUX IM Global Medtech HX | 0.10% | 79K | $149,543 | — | August 31, 2026 |
| 9 | 1290 VT GAMCO Small Company Value IB | 0.10% | 75K | $141,375 | — | August 31, 2026 |
| 10 | Fidelity Total Market Index | 0.09% | 71K | $132,981 | +1,147 (+1.7%) | August 31, 2026 |
| 11 | Fidelity Series Total Market Index | 0.08% | 59K | $110,585 | — | August 31, 2026 |
| 12 | Invesco NASDAQ Future Gen 200 ETF | 0.06% | 42K | $79,600 | — | September 30, 2026 |
| 13 | AQR Small Cap Momentum Style I | 0.05% | 36K | $68,778 | +36,487 (0.0%) | March 31, 2026 |
| 14 | Gabelli Small Cap Growth AAA | 0.04% | 30K | $56,550 | — | June 30, 2026 |
| 15 | Vanguard Balanced Index Inv | 0.03% | 26K | $49,568 | — | August 31, 2026 |
| 16 | Vanguard U.S. Eq Idx £ Acc | 0.02% | 16K | $31,014 | — | August 31, 2026 |
| 17 | Gabelli Global Mini Mites I | 0.01% | 8,000 | $15,080 | — | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
STIM insider transactions
latest 15| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-20 | Jorey Chernett | Buy | $1.58 | 100,000 | $158,000 |
| 2026-03-20 | Jorey Chernett | Buy | $1.41 | 169,472 | $238,956 |
| 2026-03-19 | Jorey Chernett | Buy | $1.33 | 450,000 | $598,500 |
| 2026-03-19 | Keith J Sullivan | Sell | $1.34 | 46,289 | $62,027 |
| 2026-03-19 | Steven Pfanstiel | Sell | $1.34 | 16,431 | $22,018 |
| 2026-03-19 | William Andrew Macan | Sell | $1.34 | 16,005 | $21,447 |
| 2026-03-18 | Jorey Chernett | Buy | $1.35 | 607,400 | $819,990 |
| 2026-03-17 | Jorey Chernett | Buy | $1.16 | 531,000 | $615,960 |
| 2026-02-26 | Keith J Sullivan | Sell | $1.35 | 8,452 | $11,410 |
| 2026-02-26 | William Andrew Macan | Sell | $1.35 | 3,427 | $4,626 |
| 2026-02-12 | Keith J Sullivan | Sell | $1.65 | 33,847 | $55,848 |
| 2026-02-12 | William Andrew Macan | Sell | $1.65 | 14,120 | $23,298 |
| 2026-02-10 | Keith J Sullivan | Sell | $1.55 | 40,976 | $63,513 |
| 2026-02-10 | William Andrew Macan | Sell | $1.55 | 3,485 | $5,402 |
| 2025-05-12 | Stephen Furlong | Sell | $4.27 | 193,460 | $826,074 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
STIM shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns STIM
Institutional investors own 54.0% of Neuronetics's shares and insiders 32.85%. The largest holder is Madryn Asset Management, LP with 24.33% of the shares (18.5M), as of June 30, 2026. Among the top 20 institutions, 11 added shares and 6 reduced their stake in the latest filings. Short interest is 17.25% of the float, or 5.64 days of average trading volume. The share count rose 613,792.9% since 2017.
Related: STIM analyst forecast, STIM key metrics. See the STIM stock overview for the latest quote and news.
STIM ownership FAQ
Who owns the most Neuronetics stock?
The largest shareholders of Neuronetics are Madryn Asset Management, LP (24.33%), UBS Group AG (2.99%), Wexford Capital LP (2.63%), FourWorld Capital Management LLC (2.29%), Lane Generational LLC (2.14%).
What percentage of Neuronetics is owned by institutions?
Institutions hold 54.0% of Neuronetics's shares outstanding; insiders hold 32.85%.
Which funds own Neuronetics?
The largest fund holders of Neuronetics are Vanguard MStar Total Stk Mkt Idx Invest (1.39%), AdvisorShares Psychedelics ETF (1.21%), Fidelity Nasdaq Composite Index (0.29%), Fidelity Extended Market Index (0.28%), EA Bridgeway Ultra-Small Company Mkt ETF (0.12%).
What is Neuronetics's short interest?
7.1M shares of Neuronetics were sold short, 17.25% of the float; at the average daily volume it would take 5.64 days to cover.
Are insiders buying or selling Neuronetics?
Of the latest 15 reported insider transactions in Neuronetics (since May 12, 2025), 5 were purchases and 10 were sales.
How many shares of Neuronetics are outstanding?
Neuronetics has 76.2M shares outstanding, of which 37.2M are in the public float.