Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in STIM held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Madryn Asset Management, LP | 18.5M | $24.1M | +0.4% | 26.643% | 65.29% |
| 2 | UBS Group AG | 2.3M | $3.0M | -20.6% | 3.275% | 0.00% |
| 3 | WEXFORD CAPITAL LP | 2.0M | $2.6M | +185.7% | 2.878% | 0.33% |
| 4 | FourWorld Capital Management LLC | 1.7M | $2.3M | +17.1% | 2.506% | 2.06% |
| 5 | Lane Generational LLC | 1.6M | $2.1M | -8.0% | 2.347% | 1.86% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 1.5M | $2.0M | -26.4% | 2.166% | 0.00% |
| 7 | MASTERS CAPITAL MANAGEMENT LLC | 1.0M | $1.3M | 0.0% | 1.437% | 0.03% |
| 8 | AdvisorShares Investments LLC | 743K | $966K | +20.3% | 1.067% | 0.12% |
| 9 | Ikarian Capital, LLC | 701K | $912K | 0.0% | 1.008% | 0.10% |
| 10 | BlackRock, Inc. | 597K | $776K | -74.3% | 0.857% | 0.00% |
| 11 | HighTower Advisors, LLC | 564K | $733K | +0.2% | 0.810% | 0.00% |
| 12 | MARSHALL WACE, LLP | 486K | $631K | — | 0.698% | 0.00% |
| 13 | GEODE CAPITAL MANAGEMENT, LLC | 458K | $596K | -52.2% | 0.659% | 0.00% |
| 14 | CITADEL ADVISORS LLC | 435K | $565K | +372.5% | 0.625% | 0.00% |
| 15 | Dauntless Investment Group, LLC | 369K | $480K | +37.1% | 0.530% | 0.38% |
| 16 | STATE STREET CORP | 290K | $377K | -65.5% | 0.417% | 0.00% |
| 17 | Centiva Capital, LP | 286K | $372K | +68.9% | 0.411% | 0.00% |
| 18 | VANGUARD FIDUCIARY TRUST CO | 265K | $344K | +2.6% | 0.380% | 0.00% |
| 19 | GOLDMAN SACHS GROUP INC | 264K | $343K | +13.1% | 0.380% | 0.00% |
| 20 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 264K | $343K | +90.5% | 0.379% | 0.00% |
| 21 | JBF Capital, Inc. | 233K | $303K | 0.0% | 0.335% | 0.04% |
| 22 | XTX Topco Ltd | 220K | $286K | +50.7% | 0.317% | 0.00% |
| 23 | MILLENNIUM MANAGEMENT LLC | 199K | $259K | — | 0.287% | 0.00% |
| 24 | JANE STREET GROUP, LLC | 199K | $259K | +548.1% | 0.287% | 0.00% |
| 25 | BOOTHBAY FUND MANAGEMENT, LLC | 189K | $246K | 0.0% | 0.272% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in STIM — a direct measure of their conviction.
Filings activity in STIM during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 86 | 15% | 53.63% | 12.10 pp | $48M | 20% |
| Q1 2026 | 101 | +4.1% | 65.73% | 3.51 pp | $60M | +0.1% |
| Q4 2025 | 97 | 3.0% | 69.24% | +32.55 pp | $60M | 2.8% |
| Q3 2025 | 100 | +11% | 36.69% | +6.74 pp | $62M | 0.3% |
| Q2 2025 | 90 | 8.2% | 29.95% | +1.90 pp | $62M | +2.9% |
| Q1 2025 | 98 | +118% | 28.05% | +13.28 pp | $61M | +407% |
| Q4 2024 | 45 | 8.2% | 14.77% | 0.44 pp | $12M | +51% |
| Q3 2024 | 49 | — | 15.21% | — | $8M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Latest Form 4 transactions by company officers and directors. Insider buys are widely viewed as a key fundamental indicator because executives are risking personal capital.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| May 12, 2026 | Chernett Jorey | Buy | 475K | $1.34 | $637K |
Quick answers to the most common questions about buying STIM stock.
Based on Q2 2026 13F filings, institutional ownership of Neuronetics, Inc. stands at 53.6%, held across 86 reporting institutions.
Madryn Asset Management, LP is the largest reported institutional holder of STIM, with approximately 18,540,488 shares worth $0.02B as of Q2 2026.
Yes — 4 widely-followed marquee investors appear among the top 25 institutional holders of STIM, including CITADEL ADVISORS LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP, MILLENNIUM MANAGEMENT LLC, JANE STREET GROUP, LLC.
Our composite Smart Money Score for STIM is 42 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
15 institutions opened new positions in STIM during Q2 2026, while 30 fully exited. 20 added to existing positions and 49 trimmed.
STIM institutional ownership fell by 12.10 percentage points quarter-over-quarter, with a net change of -15 holders.
The top 10 institutions account for 82.7% of all reported 13F value in STIM, and the top 25 account for 95.4%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Neuronetics, Inc. (STIM) Institutional Ownership