Neuronetics, Inc.
Neuronetics, Inc. (STIM) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · STIM · as of Sep 30, 2025
Ownership Breakdown
110
Institutional Holders
▲ 14 vs Q2
$58.17M
Total Inst. Value
▼ $4.98M vs Q2
69.59M
Shares Outstanding
freeFloat 44.07%
21.28M
13F Shares Held
▲ 3.18M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
STIM largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC surgical & medical instruments & apparatus | 2.83M | 4.28% | 4.28% | $7.73B | Nov 7, 2025 | ▲ 89.5K |
BLACKROCK, INC. surgical & medical instruments & apparatus | 2.30M | 3.48% | 3.48% | $6.29B | Nov 12, 2025 | ▲ 64.3K |
UBS GROUP AG surgical & medical instruments & apparatus | 2.16M | 3.27% | 3.27% | $5.91B | Nov 13, 2025 | ▲ 1.85M |
BALYASNY ASSET MANAGEMENT L.P. surgical & medical instruments & apparatus | 1.82M | 2.75% | 2.75% | $4.97B | Nov 14, 2025 | ▲ 312.6K |
BALYASNY ASSET MANAGEMENT L.P. surgical & medical instruments & apparatus | 1.28M | 1.93% | 1.93% | $3.49B | Nov 14, 2025 | NEW |
WEXFORD CAPITAL LP surgical & medical instruments & apparatus | 1.18M | 1.78% | 1.78% | $3.21B | Nov 14, 2025 | ▲ 534.2K |
MASTERS CAPITAL MANAGEMENT LLC surgical & medical instruments & apparatus | 1.00M | 1.51% | 1.51% | $2.73B | Nov 14, 2025 | — held |
MARSHALL WACE, LLP surgical & medical instruments & apparatus | 925.1K | 1.40% | 1.40% | $2.53B | Nov 13, 2025 | ▲ 881.9K |
IKARIAN CAPITAL, LLC surgical & medical instruments & apparatus | 905.7K | 1.37% | 1.37% | $2.47B | Nov 14, 2025 | ▼ 194.0K |
GEODE CAPITAL MANAGEMENT, LLC surgical & medical instruments & apparatus | 876.9K | 1.33% | 1.33% | $2.39B | Nov 12, 2025 | ▼ 2.1K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
31
Increased
+5.64M shares5
New Positions
first time holders9
Decreased
−1.24M shares0
Sold Out
fully exitedNet shares change (top 50)
+4.41M
+5.64M / −1.24M
Net new holders
+27
5 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
STIM insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
10
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Rosengarten Megan director | May 28, 2026 | Award | 30,000 | — | — | 170.9K | Form 4 ↗ |
MUIR GLENN P director | May 28, 2026 | Award | 30,000 | — | — | 401.8K | Form 4 ↗ |
Cucuz Sasha director | May 28, 2026 | Award | 30,000 | — | — | 1.54M | Form 4 ↗ |
CONLEY SHERYL L director | May 28, 2026 | Award | 30,000 | — | — | 251.7K | Form 4 ↗ |
CASCELLA ROBERT director | May 28, 2026 | Award | 36,250 | — | — | 625.0K | Form 4 ↗ |
Amin Avinash director | May 28, 2026 | Award | 30,000 | — | — | 72.5K | Form 4 ↗ |
Pfanstiel Steven Former EVP, CFO and Treasurer | Mar 19, 2026 | Sale | 8,569 | $1.34 | $11.5K | 836.6K | Form 4 ↗ |
Chernett Jorey 10 percent owner | May 19, 2026 | Purchase | 100,000 | $1.17 | $117.0K | 10.55M | Form 4 ↗ |
Chernett Jorey 10 percent owner | May 12, 2026 | Purchase | 475,000 | $1.34 | $636.5K | 10.45M | Form 4 ↗ |
Chernett Jorey 10 percent owner | Apr 21, 2026 | Purchase | 100,000 | $1.51 | $151.0K | 9.98M | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Neuronetics, Inc. (STIM) is primarily owned by institutional investors, who hold approximately 30.6% of total shares outstanding. Company insiders own approximately 55.93%, while retail and public investors account for the remaining 13.49%.
The largest institutional shareholder of Neuronetics, Inc. is VANGUARD GROUP INC, holding approximately 2.83 million shares — equal to 4.28% of outstanding shares — as of September 30, 2025.
A total of 110 institutional investors currently hold STIM stock, with a combined institutional value of approximately $58,166,803 as of the most recent 13F filing period.
Frequently asked questions
STIM ownershipNeuronetics, Inc. (STIM) is primarily owned by institutional investors, who hold approximately 30.6% of shares. The largest shareholder is VANGUARD GROUP INC with a 4.28% stake. Company insiders hold 55.93%. Data sourced from SEC Form 13F as of September 30, 2025.