Silicon Motion Technology Corporation
Silicon Motion Technology Corporation (SIMO) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · SIMO · as of Sep 30, 2025
Ownership Breakdown
231
Institutional Holders
▲ 7 vs Q2
$2.60B
Total Inst. Value
▲ $491.15M vs Q2
33.56M
Shares Outstanding
freeFloat 96.86%
27.43M
13F Shares Held
▼ 620,893 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
SIMO largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
FMR LLC semiconductors & related devices | 3.40M | 40.51% | 40.51% | $322.20B | Nov 13, 2025 | ▲ 654.3K |
REINHART PARTNERS, INC. semiconductors & related devices | 1.50M | 17.89% | 17.89% | $142.30B | Oct 28, 2025 | ▲ 29.4K |
ACADIAN ASSET MANAGEMENT LLC semiconductors & related devices | 1.30M | 15.52% | 15.52% | $123.37B | Nov 13, 2025 | ▼ 8.7K |
PERTENTO PARTNERS LLP semiconductors & related devices | 1.29M | 15.38% | 15.38% | $122.34B | Nov 13, 2025 | ▲ 31.4K |
LORD, ABBETT & CO. LLC semiconductors & related devices | 1.13M | 13.53% | 13.53% | $107.58B | Nov 13, 2025 | ▼ 113.8K |
FRONTIER CAPITAL MANAGEMENT CO LLC semiconductors & related devices | 1.04M | 12.43% | 12.43% | $98.90B | Nov 14, 2025 | ▼ 238.0K |
INVESCO LTD. semiconductors & related devices | 905.9K | 10.80% | 10.80% | $85.89B | Nov 13, 2025 | ▼ 39 |
LAZARD ASSET MANAGEMENT LLC semiconductors & related devices | 783.7K | 9.34% | 9.34% | $74.30B | Nov 14, 2025 | ▲ 17.7K |
POINT72 ASSET MANAGEMENT, L.P. semiconductors & related devices | 700.0K | 8.34% | 8.34% | $66.37B | Nov 14, 2025 | ▼ 364.4K |
WELLINGTON MANAGEMENT GROUP LLP semiconductors & related devices | 696.0K | 8.30% | 8.30% | $65.98B | Nov 14, 2025 | ▼ 154.0K |
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
20
Increased
+1.97M shares3
New Positions
first time holders23
Decreased
−2.17M shares0
Sold Out
fully exitedNet shares change (top 50)
201.3K
+1.97M / −2.17M
Net new holders
+0
3 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
SIMO insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
0
Buy transactions
1
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 |
|---|---|---|---|---|---|---|---|
DUANN SHII TYNG director | May 6, 2026 | Sale | 1,500 | $245.00 | $367.5K | 15.2K | 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
Silicon Motion Technology Corporation (SIMO) is primarily owned by institutional investors, who hold approximately 81.7% of total shares outstanding. Company insiders own approximately 3.14%, while retail and public investors account for the remaining 15.13%.
The largest institutional shareholder of Silicon Motion Technology Corporation is FMR LLC, holding approximately 3.40 million shares — equal to 40.51% of outstanding shares — as of September 30, 2025.
A total of 231 institutional investors currently hold SIMO stock, with a combined institutional value of approximately $2.60 billion as of the most recent 13F filing period.
Frequently asked questions
SIMO ownershipSilicon Motion Technology Corporation (SIMO) is primarily owned by institutional investors, who hold approximately 81.7% of shares. The largest shareholder is FMR LLC with a 40.51% stake. Company insiders hold 3.14%. Data sourced from SEC Form 13F as of September 30, 2025.