SILICON MOTION TECHNOLOGY (SIMO) — Institutional Holders & Hedge Fund Ownership
SILICON MOTION TECHNOLOGY (SIMO) institutional ownership: 6 hedge funds and institutional investors, holding 1.0M shares ($113.7M), as of Q1 2026, per SEC Form 13F-HR filings.
Quarterly 13F filings reveal which hedge funds, family offices, and institutional investors hold SILICON MOTION TECHNOLOGY (SIMO) — and how their positions changed versus the prior quarter. The data covers every 13F filer that disclosed a SIMO position — top holders by portfolio weight, biggest quarterly buyers and sellers, and positioning shifts.
The top SIMO shareholders by portfolio weight are Kite Lake Capital Management (51.27%), CastleKnight (1.70%), and Melqart (0.61%). In Q1 2026, CastleKnight made the largest position increase (+1.26%).
Top 6 Institutional Holders of SILICON MOTION TECHNOLOGY (SIMO) — Q1 2026
| # | Fund | Shares | Market Value | Portfolio Weight |
|---|---|---|---|---|
| 1 | Kite Lake Capital Management | 452,574 | $50.8M | 51.27% |
| 2 | CastleKnight | 323,475 | $36.3M | 1.70% |
| 3 | Melqart | 55,124 | $6.2M | 0.61% |
| 4 | UTIMCO - The University of Texas | 5,758 | $647K | 0.09% |
| 5 | First Eagle Investment Management | 168,439 | $18.9M | 0.03% |
| 6 | Maverick Capital | 7,369 | $827K | 0.01% |
- 6Hedge funds holding
- 1,012,739Shares held (disclosed)
- $113.7M13F market value
- 0.35%Median portfolio weight
Ownership History
Quarter-by-quarter share count, market value, and portfolio conviction weight (up to 5 of the heaviest weight-by-portfolio funds) of SIMO. Sourced from 13F filings; reflects long equity positions only.
Quarter-over-Quarter ActivityQ1 2026
The biggest weight-increase and weight-decrease changes among funds that hold SIMO. Deltas compare the selected filing to the previous reporting quarter.
Top buyers
- CastleKnight+1.26% · +241,239 shares
- Maverick Capital+0.01% · +7,369 shares
- First Eagle Investment Management+-0.00% · +14,920 shares
Top sellers
- Kite Lake Capital Management-31.49% · -3,697 shares
- Melqart-0.30% · -43,293 shares
- UTIMCO - The University of Texas-0.11% · -9,498 shares
Options Activity
- Total calls180,000 (+166,300)
Ownership Statistics
- Funds holding
- 6
- Median weight
- 0.35%
- Largest holder
- Kite Lake Capital Management · 51.27%
- Smallest holder
- Maverick Capital · 0.01%
- Shares held
- 1,012,739 (+207,040)
All Institutional HoldersSortable · searchable
All institutional investors (Max 50) holding SIMO in the selected quarter. Click a fund name to drill into its full 13F portfolio.
| 1 | Kite Lake Capital Management | 452,574 | $50.8M | 51.27% |
| 2 | CastleKnight | 323,475 | $36.3M | 1.70% |
| 3 | Melqart | 55,124 | $6.2M | 0.61% |
| 4 | UTIMCO - The University of Texas | 5,758 | $646.6K | 0.09% |
| 5 | First Eagle Investment Management | 168,439 | $18.9M | 0.03% |
| 6 | Maverick Capital | 7,369 | $827.5K | 0.01% |
Methodology & FAQ
Methodology: How We Track SIMO Institutional Holdings
Our data is systematically aggregated directly from quarterly Form 13F-HR disclosures submitted to the U.S. Securities and Exchange Commission (SEC).
- Who Must File (Reporting Threshold): This dataset includes filings from U.S. institutional investment managers, hedge funds, mutual funds, university endowments, and family offices managing at least $100 million in Section 13(f) securities (including equities, options, convertibles, ETFs, and warrants).
- What is Included (Data Scope): We capture long positions in Section 13(f) securities for SILICON MOTION TECHNOLOGY CORP (SIMO). By SEC regulation, 13F filings do not require the disclosure of short positions, non-U.S. holdings, or OTC derivatives. Listed options are excluded from portfolio weight calculations to ensure comparability across filers.
- Portfolio Weight Explained (Metric Definition): “Portfolio Weight” shows how much of a fund's total reported 13F portfolio value (excluding listed options) is allocated to SIMO on the specific reporting date.
- How to Use This Data (Interpretation): Quarter-over-quarter changes in shares and portfolio weight reflect a combination of active trading and market price movements. These are descriptive metrics of fund allocation, not explicit buy or sell signals.
How do you measure hedge fund conviction and institutional concentration in SIMO?
We evaluate fund conviction by looking at portfolio weight rather than just absolute share count. By tracking how the largest holders —such as Kite Lake Capital Management , CastleKnight , and Melqart as of Q1 2026— change their position sizing quarter-over-quarter, we help investors distinguish between deliberate position sizing changes and passive mark-to-market drift.
Does the SIMO ownership data include short interest or options?
SEC Form 13F mandates the disclosure of long positions in Section 13(f) securities, which includes equities and listed options (put and call contracts), but excludes short interest, swaps, and OTC derivatives by regulatory design. On this platform, listed options are excluded from portfolio weight calculations to ensure comparability across filers.
Are family offices and university endowments included in this SIMO data?
Yes. In addition to traditional hedge funds and large asset managers, any institutional entity exercising investment discretion over at least $100 million in Section 13(f) securities must file a Form 13F. This explicitly includes single-family offices and university endowments. If a qualifying family office or endowment holds SIMO stock, their allocation is systematically aggregated alongside traditional fund data.
When is the institutional ownership data updated, and is there a reporting lag?
Institutional investment managers are required to file their Form 13F within 45 days after the end of a calendar quarter (the standard “T+45” window). Our platform re-ingests new filings from the SEC EDGAR database on a nightly cycle, typically within 24–48 hours of publication, providing a point-in-time snapshot of reported consensus positioning for SIMO as of each filing date.