Silicon Motion Technology (SIMO)
Silicon Motion Technology on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials and insider trades. Listed on Nasdaq, classified by the SEC as semiconductors & related devices.
1.5M
Short interest
settlement 2026-09-30
2.3
Days to cover
unchanged vs prior
39.8%
Short share of volume
2026-10-09
104
Fails to deliver
settlement 2026-08-27
$0
Insider flow, 90 days
0 buys, 0 sells
As of 2026-10-09.
Short interest
FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in SIMO is 1,533,571 shares, down 107,299 shares over the last month. Over the last 48 readings it ranged from 266,517 shares (14 November 2025) to 1,964,720 shares (15 September 2026). At the reported average volume of 659K shares a day that is 2.3 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 1,533,571 | -21.9% | 659,418 | 2.33 |
| 2026-09-15 | 1,964,720 | +19.7% | 826,050 | 2.38 |
| 2026-08-31 | 1,640,870 | +12.8% | 826,021 | 1.99 |
| 2026-08-14 | 1,455,337 | +80.2% | 1,439,653 | 1.01 |
| 2026-07-31 | 807,432 | +13.5% | 1,131,426 | 1.00 |
| 2026-07-15 | 711,491 | -8.9% | 648,312 | 1.10 |
| 2026-06-30 | 781,088 | -16.6% | 1,011,844 | 1.00 |
| 2026-06-15 | 936,989 | -12.5% | 1,007,334 | 1.00 |
| 2026-05-29 | 1,071,129 | +70.0% | 1,142,975 | 1.00 |
| 2026-05-15 | 630,042 | +22.1% | 1,211,736 | 1.00 |
| 2026-04-30 | 516,019 | +65.2% | 1,114,242 | 1.00 |
| 2026-04-15 | 312,306 | -8.9% | 552,875 | 1.00 |
| 2026-03-31 | 342,704 | -23.9% | 518,542 | 1.00 |
| 2026-03-13 | 450,530 | -16.3% | 454,137 | 1.00 |
| 2026-02-27 | 537,938 | -19.4% | 505,372 | 1.06 |
| 2026-02-13 | 667,782 | +12.3% | 905,345 | 1.00 |
| 2026-01-30 | 594,671 | -16.3% | 662,233 | 1.00 |
| 2026-01-15 | 710,723 | +7.2% | 984,732 | 1.00 |
| 2025-12-31 | 662,726 | +34.9% | 239,479 | 2.77 |
| 2025-12-15 | 491,338 | +4.7% | 285,692 | 1.72 |
| 2025-11-28 | 469,429 | +76.1% | 375,914 | 1.25 |
| 2025-11-14 | 266,517 | -21.6% | 467,461 | 1.00 |
| 2025-10-31 | 340,113 | -15.8% | 415,882 | 1.00 |
| 2025-10-15 | 404,084 | -36.1% | 515,607 | 1.00 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 9 October 2026, the short share of SIMO volume is 39.8%, up 8.8 points over the last five sessions. Over the last 30 readings it ranged from 27.0% (1 October 2026) to 66.6% (16 September 2026). The latest reading is 4.6 points below the 30-session average of 44.4%, on 199K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-09 | 79K | 199K | 39.8% | 10,944 |
| 2026-10-08 | 160K | 437K | 36.5% | 5,079 |
| 2026-10-07 | 167K | 369K | 45.3% | 20 |
| 2026-10-06 | 220K | 519K | 42.5% | 0 |
| 2026-10-05 | 170K | 411K | 41.3% | 199 |
| 2026-10-02 | 107K | 346K | 31.0% | 0 |
| 2026-10-01 | 73K | 272K | 27.0% | 0 |
| 2026-09-30 | 96K | 215K | 44.9% | 2,800 |
| 2026-09-29 | 131K | 234K | 55.9% | 33,964 |
| 2026-09-28 | 81K | 226K | 35.8% | 25 |
| 2026-09-25 | 131K | 238K | 55.2% | 0 |
| 2026-09-24 | 176K | 371K | 47.5% | 9,377 |
| 2026-09-23 | 87K | 277K | 31.4% | 0 |
| 2026-09-22 | 206K | 580K | 35.5% | 8,700 |
| 2026-09-21 | 161K | 478K | 33.7% | 7,700 |
| 2026-09-18 | 162K | 379K | 42.7% | 0 |
| 2026-09-17 | 193K | 327K | 59.0% | 1,244 |
| 2026-09-16 | 239K | 359K | 66.6% | 0 |
| 2026-09-15 | 180K | 370K | 48.7% | 16,194 |
| 2026-09-14 | 378K | 754K | 50.1% | 16,797 |
| 2026-09-11 | 227K | 403K | 56.2% | 612 |
| 2026-09-10 | 119K | 226K | 52.4% | 0 |
| 2026-09-09 | 197K | 382K | 51.6% | 276 |
| 2026-09-08 | 178K | 490K | 36.3% | 1,264 |
| 2026-09-04 | 149K | 294K | 50.8% | 13 |
| 2026-09-03 | 146K | 520K | 28.1% | 0 |
| 2026-09-02 | 158K | 333K | 47.5% | 7,139 |
| 2026-09-01 | 121K | 328K | 36.9% | 5 |
| 2026-08-31 | 157K | 262K | 60.0% | 1 |
| 2026-08-28 | 83K | 204K | 40.8% | 37 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 27 August 2026, the fails-to-deliver balance in SIMO is 104 shares, up 4 shares over the last settlement date. Over the last 30 readings it ranged from 7 shares (18 June 2026) to 26,447 shares (11 August 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-08-27 | 104 | $263.11 | $27K |
| 2026-08-24 | 100 | $258.36 | $26K |
| 2026-08-12 | 12,309 | $224.00 | $2.8M |
| 2026-08-11 | 26,447 | $230.61 | $6.1M |
| 2026-08-04 | 868 | $251.52 | $218K |
| 2026-07-17 | 14 | $272.45 | $4K |
| 2026-07-08 | 36 | $294.90 | $11K |
| 2026-06-29 | 180 | $305.28 | $55K |
| 2026-06-26 | 29 | $325.26 | $9K |
| 2026-06-25 | 106 | $321.66 | $34K |
| 2026-06-24 | 48 | $319.00 | $15K |
| 2026-06-22 | 500 | $321.66 | $161K |
| 2026-06-18 | 7 | $307.12 | $2K |
| 2026-06-15 | 1,569 | $280.49 | $440K |
| 2026-06-11 | 196 | $251.68 | $49K |
| 2026-06-08 | 97 | $258.70 | $25K |
| 2026-05-20 | 52 | $252.92 | $13K |
| 2026-05-19 | 170 | $239.76 | $41K |
| 2026-05-18 | 830 | $259.99 | $216K |
| 2026-05-13 | 4,826 | $258.71 | $1.2M |
| 2026-05-12 | 2,747 | $262.05 | $720K |
| 2026-05-07 | 200 | $244.95 | $49K |
| 2026-05-06 | 12,299 | $238.41 | $2.9M |
| 2026-05-05 | 3,760 | $227.16 | $854K |
| 2026-05-04 | 4,505 | $234.52 | $1.1M |
| 2026-04-30 | 21,892 | $217.50 | $4.8M |
| 2026-04-22 | 196 | $142.45 | $28K |
| 2026-04-21 | 982 | $138.70 | $136K |
| 2026-04-20 | 200 | $139.71 | $28K |
| 2026-04-16 | 161 | $139.03 | $22K |
Insider trades
SEC Form 4, newest first. JSONNo open-market insider trades were reported for SIMO in the last 90 days. The most recent filings are listed below. Latest filing: LIN KUAN-MING (Director) on 2026-06-18.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-06-18 | LIN KUAN-MING | Director | Sell | 1K | $320.31 | $320K | 8K |
| 2026-06-18 | SHIEH HAN-PING | Director | Sell | 1K | $328.00 | $328K | 7K |
| 2026-06-17 | LIN KUAN-MING | Director | Sell | 1K | $300.00 | $300K | 10K |
| 2026-06-17 | LIN KUAN-MING | Director | Sell | 1K | $310.01 | $310K | 9K |
| 2026-06-02 | SHIEH HAN-PING | Director | Sell | 1K | $301.25 | $301K | 8K |
| 2026-05-06 | DUANN SHII TYNG | Director | Sell | 2K | $245.00 | $368K | 15K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Planned sales (Form 144)
Newest first. JSON9 Form 144 notices on file for SIMO worth $6.2M at the prices reported; 0 in the last 90 days worth $0. Latest: LIN KUAN-MING filed on 2026-06-04 to sell 10,500 shares ($3.2M) from 2026-06-05.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-06-04 | LIN KUAN-MINGAffiliate | 11K | $3.2M | 0.031% | 2026-06-05 | Pershing LLC |
| 2026-05-27 | SHIEH HAN-PINGAffiliate | 2K | $552K | 0.006% | 2026-05-28 | Pershing LLC |
| 2026-05-27 | Fan Robert COfficer | 500 | $136K | 0.000% | 2026-05-27 | Fidelity Brokerage Services LLC |
| 2026-05-18 | Fan Robert COfficer | 1K | $226K | 0.001% | 2026-05-18 | Fidelity Brokerage Services LLC |
| 2026-05-01 | DUANN SHII TYNGAffiliate | 2K | $329K | 0.004% | 2026-05-04 | Pershing LLC |
| 2026-02-24 | Fan RobertOfficer | 2K | $271K | 0.006% | 2026-02-24 | Fidelity Brokerage Services LLC |
| 2025-12-09 | Fan RobertOfficer | 3K | $271K | 0.002% | 2025-12-09 | Fidelity Brokerage Services LLC |
| 2025-11-10 | DUANN SHII TYNGAffiliate | 1K | $95K | 0.003% | 2025-11-11 | Pershing LLC |
| 2025-09-16 | LIN KUAN-MINGAffiliate | 13K | $1.1M | 0.036% | 2025-09-17 | Pershing LLC |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON2 holders report 5% or more of SIMO in their latest filing, all on Schedule 13G (passive). The largest reported stake is FMR LLC at 6.7% of the class (9,111,296 shares), filed 2026-08-06 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-06 | 13G/Ano. 4 | FMR LLCparent holding company | 9.1M | 6.7% | 2026-06-30 |
| 2026-08-06 | 13G/Ano. 4 | Abigail P. Johnsonindividual | 9.1M | 6.7% | 2026-06-30 |
13F holders
Tracked managers holding SIMO at their latest 13F. JSON7 of the 30 tracked managers held SIMO at their latest 13F, $435.0M in total at quarter-end prices. Two Sigma Investments is the largest at $233.7M (0.2% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 2 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Two Sigma Investments | 2026-06-30 | 701K | $233.7M | 0.17% | +427K |
| D. E. Shaw & Co. | 2026-06-30 | 363K | $121.0M | 0.06% | new |
| Millennium Management | 2026-06-30 | 180K | $60.0M | 0.02% | -216K |
| Citadel Advisors | 2026-06-30 | 40K | $13.5M | 0.00% | -24K |
| Point72 Asset Management | 2026-06-30 | 19K | $6.3M | 0.01% | new |
| Renaissance Technologies | 2026-06-30 | 979 | $326K | 0.00% | new |
| AQR Capital Management | 2026-06-30 | 751 | $250K | 0.00% | new |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
Financials
SEC XBRL, as filed. JSONIn FY 2025 it generated $61.4M of operating cash flow and spent $24.3M on buybacks and $67.2M on dividends.
- Cash
- $201.8M
- Equity
- $830.7M
- Total assets
- $1.22B
- Shares outstanding
- 134,244,840
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2025 | 2025-12-31 | $885.6M | $122.6M | $61.4M | $55.1M | $24.3M | $67.2M |
| FY 2024 | 2024-12-31 | $803.6M | $89.2M | $77.1M | $44.4M | $0 | $67.3M |
| FY 2023 | 2023-12-31 | $639.1M | $52.9M | $149.1M | $50.3M | $0 | $16.7M |
| FY 2022 | 2022-12-31 | $945.9M | $172.5M | $83.9M | $32.9M | $133.2M | $49.9M |
| FY 2021 | 2021-12-31 | $922.1M | $200.0M | $174.7M | $24.7M | $45.7M | $54.0M |
Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2025-12-31; shares outstanding as of 2025-12-31 from the cover page.
What this page is
Silicon Motion Technology in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Silicon Motion Technology (SIMO), SEC CIK 1329394, listed on Nasdaq, classified by the SEC as semiconductors & related devices. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-09.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-08-27.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-06-04.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-08-06.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Financials
- SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. Latest 2025-12-31.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-06-18.JSON and CSV
- Company record
- EDGAR filing index for CIK 1329394Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
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Datasets
Frequently Asked Questions
How much of SIMO is sold short?
What is SIMO's daily short volume?
Does SIMO have fails to deliver?
Are SIMO insiders buying or selling?
Have SIMO insiders filed to sell?
Who owns 5% or more of SIMO?
What did SIMO report last quarter?
Which tracked 13F managers own SIMO?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.