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Silicon Motion Technology CORP

SIMO
Exchange
Nasdaq
Industry
Semiconductors & Related Devices
SEC CIK
0001329394

No open-market purchases or sales by Silicon Motion Technology CORP insiders were filed in the last 90 days; 387 institutions reported holding it in 13F filings for Q2 2026, worth $8.23B in total; Maverick Capital is the only superinvestor holding it.

Four kinds of short-selling data, each measuring something different:

  • Short interest: shares sold short and not yet bought back, as of a settlement date. FINRA publishes it twice a month, about eight business days after the settlement date.
  • Daily short volume: shares sold short each day in off-exchange trades reported to FINRA. It counts trades, not open positions, and is published the next day.
  • Fails-to-deliver: shares not delivered by the settlement date. The SEC publishes them twice a month, about two weeks late.
  • ATS (dark pool) volume: weekly volume on alternative trading systems and other off-exchange venues. FINRA publishes it two to four weeks after the week.

More in the glossary.

Short interest

Shares sold short and not yet bought back, from FINRA, on every settlement date in the last two years.

Short interest
1.75M
Shares, settlement Oct 30, 2026
Change
+69.9K
+4.2% vs. Oct 15, 2026
Days to cover
1.74
Short interest ÷ average daily volume
Average daily volume
1.01M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 663,552 sharesNov 15, 2024: 641,167 sharesNov 29, 2024: 653,747 sharesDec 13, 2024: 700,067 sharesDec 31, 2024: 727,446 sharesJan 15, 2025: 789,616 sharesJan 31, 2025: 960,802 sharesFeb 14, 2025: 928,665 sharesFeb 28, 2025: 966,115 sharesMar 14, 2025: 1,008,884 sharesMar 31, 2025: 1,048,165 sharesApr 15, 2025: 884,237 sharesApr 30, 2025: 633,213 sharesMay 15, 2025: 649,849 sharesMay 30, 2025: 1,263,208 sharesJun 13, 2025: 1,084,060 sharesJun 30, 2025: 1,063,028 sharesJul 15, 2025: 969,426 sharesJul 31, 2025: 813,702 sharesAug 15, 2025: 758,455 sharesAug 29, 2025: 766,962 sharesSep 15, 2025: 831,769 sharesSep 30, 2025: 631,931 sharesOct 15, 2025: 404,084 sharesOct 31, 2025: 340,113 sharesNov 14, 2025: 266,517 sharesNov 28, 2025: 469,429 sharesDec 15, 2025: 491,338 sharesDec 31, 2025: 662,726 sharesJan 15, 2026: 710,723 sharesJan 30, 2026: 594,671 sharesFeb 13, 2026: 667,782 sharesFeb 27, 2026: 537,938 sharesMar 13, 2026: 450,530 sharesMar 31, 2026: 342,704 sharesApr 15, 2026: 312,306 sharesApr 30, 2026: 516,019 sharesMay 15, 2026: 630,042 sharesMay 29, 2026: 1,071,129 sharesJun 15, 2026: 936,989 sharesJun 30, 2026: 781,088 sharesJul 15, 2026: 711,491 sharesJul 31, 2026: 807,432 sharesAug 14, 2026: 1,455,337 sharesAug 31, 2026: 1,640,870 sharesSep 15, 2026: 1,964,720 sharesSep 30, 2026: 1,533,571 sharesOct 15, 2026: 1,681,831 sharesOct 30, 2026: 1,751,718 shares
Short interest in SIMO by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20261.75M+69.9K+4.2%1.01M1.74
Oct 15, 20261.68M+148.3K+9.7%784.3K2.14
Sep 30, 20261.53M−431.1K−21.9%659.4K2.33
Sep 15, 20261.96M+323.9K+19.7%826.0K2.38
Aug 31, 20261.64M+185.5K+12.8%826.0K1.99
Aug 14, 20261.46M+647.9K+80.2%1.44M1.01
Jul 31, 2026807.4K+95.9K+13.5%1.13M1.00
Jul 15, 2026711.5K−69.6K−8.9%648.3K1.10
Jun 30, 2026781.1K−155.9K−16.6%1.01M1.00
Jun 15, 2026937.0K−134.1K−12.5%1.01M1.00
May 29, 20261.07M+441.1K+70.0%1.14M1.00
May 15, 2026630.0K+114.0K+22.1%1.21M1.00
Apr 30, 2026516.0K+203.7K+65.2%1.11M1.00
Apr 15, 2026312.3K−30.4K−8.9%552.9K1.00
Mar 31, 2026342.7K−107.8K−23.9%518.5K1.00
Mar 13, 2026450.5K−87.4K−16.3%454.1K1.00
Feb 27, 2026537.9K−129.8K−19.4%505.4K1.06
Feb 13, 2026667.8K+73.1K+12.3%905.3K1.00
Jan 30, 2026594.7K−116.1K−16.3%662.2K1.00
Jan 15, 2026710.7K+48.0K+7.2%984.7K1.00
Dec 31, 2025662.7K+171.4K+34.9%239.5K2.77
Dec 15, 2025491.3K+21.9K+4.7%285.7K1.72
Nov 28, 2025469.4K+202.9K+76.1%375.9K1.25
Nov 14, 2025266.5K−73.6K−21.6%467.5K1.00
Oct 31, 2025340.1K−64.0K−15.8%415.9K1.00
Oct 15, 2025404.1K−227.8K−36.1%515.6K1.00
Sep 30, 2025631.9K−199.8K−24.0%352.9K1.79
Sep 15, 2025831.8K+64.8K+8.5%307.9K2.70
Aug 29, 2025767.0K+8.51K+1.1%209.8K3.66
Aug 15, 2025758.5K−55.2K−6.8%282.0K2.69
Jul 31, 2025813.7K−155.7K−16.1%407.6K2.00
Jul 15, 2025969.4K−93.6K−8.8%266.4K3.64
Jun 30, 20251.06M−21.0K−1.9%375.3K2.83
Jun 13, 20251.08M−179.1K−14.2%344.6K3.15
May 30, 20251.26M+613.4K+94.4%603.0K2.09
May 15, 2025649.8K+16.6K+2.6%586.2K1.11
Apr 30, 2025633.2K−251.0K−28.4%578.8K1.09
Apr 15, 2025884.2K−163.9K−15.6%562.7K1.57
Mar 31, 20251.05M+39.3K+3.9%380.7K2.75
Mar 14, 20251.01M+42.8K+4.4%433.5K2.33
Feb 28, 2025966.1K+37.5K+4.0%459.1K2.10
Feb 14, 2025928.7K−32.1K−3.3%538.8K1.72
Jan 31, 2025960.8K+171.2K+21.7%337.9K2.84
Jan 15, 2025789.6K+62.2K+8.6%270.0K2.92
Dec 31, 2024727.4K+27.4K+3.9%259.4K2.80
Dec 13, 2024700.1K+46.3K+7.1%293.5K2.39
Nov 29, 2024653.7K+12.6K+2.0%389.3K1.68
Nov 15, 2024641.2K−22.4K−3.4%262.0K2.45
Oct 31, 2024663.6K−16.1K−2.4%251.3K2.64

Fails-to-deliver

Shares that weren't delivered by the settlement date, from the SEC, for the last 30 dates with fails. The price is the previous day's closing price published by the SEC.

Fails-to-deliver in SIMO by settlement date
Settlement dateSharesPriceValue
Oct 7, 2026200$284.96$57.0K
Oct 6, 20264$282.45$1.13K
Sep 21, 2026236$272.11$64.2K
Aug 27, 2026104$263.11$27.4K
Aug 24, 2026100$258.36$25.8K
Aug 12, 202612,309$224.00$2.76M
Aug 11, 202626,447$230.61$6.10M
Aug 4, 2026868$251.52$218.3K
Jul 17, 202614$272.45$3.81K
Jul 8, 202636$294.90$10.6K
Jun 29, 2026180$305.28$55.0K
Jun 26, 202629$325.26$9.43K
Jun 25, 2026106$321.66$34.1K
Jun 24, 202648$319.00$15.3K
Jun 22, 2026500$321.66$160.8K
Jun 18, 20267$307.12$2.15K
Jun 15, 20261,569$280.49$440.1K
Jun 11, 2026196$251.68$49.3K
Jun 8, 202697$258.70$25.1K
May 20, 202652$252.92$13.2K
May 19, 2026170$239.76$40.8K
May 18, 2026830$259.99$215.8K
May 13, 20264,826$258.71$1.25M
May 12, 20262,747$262.05$719.9K
May 7, 2026200$244.95$49.0K
May 6, 202612,299$238.41$2.93M
May 5, 20263,760$227.16$854.1K
May 4, 20264,505$234.52$1.06M
Apr 30, 202621,892$217.50$4.76M
Apr 22, 2026196$142.45$27.9K

Daily short volume

Off-exchange short-sale volume, not short interest: shares sold short each day in trades reported to FINRA, for the last 30 trading days.

The short volume ratio isn't a sentiment gauge: market makers sell short to fill buy orders and to hedge, so short sales are usually about half of off-exchange volume.

Off-exchange short volume in SIMO by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 202699,5238,600300,92133.1%
Nov 9, 2026126,097382309,94540.7%
Nov 6, 2026128,56717,174567,51222.7%
Nov 5, 2026229,20311,5411,085,35421.1%
Nov 4, 2026295,48434,235958,34030.8%
Nov 3, 2026145,39612,017434,70833.4%
Nov 2, 2026179,93729,977722,71824.9%
Oct 30, 2026134,6825,563613,06522.0%
Oct 29, 2026421,605599997,38442.3%
Oct 28, 2026374,105623718,35152.1%
Oct 27, 2026165,111301357,49846.2%
Oct 26, 2026124,8470452,57627.6%
Oct 23, 2026153,3668,273525,53529.2%
Oct 22, 2026306,50915,038912,18433.6%
Oct 21, 2026119,1245,300233,41051.0%
Oct 20, 202684,1290171,04549.2%
Oct 19, 2026126,57813,830297,25242.6%
Oct 16, 202697,00761264,32236.7%
Oct 15, 2026137,92110,089667,72820.7%
Oct 14, 2026144,26610,742479,28730.1%
Oct 13, 2026120,2240298,61540.3%
Oct 12, 202677,0482,206320,20824.1%
Oct 9, 202679,15510,944198,95739.8%
Oct 8, 2026159,6605,079436,91636.5%
Oct 7, 2026167,05520368,52445.3%
Oct 6, 2026220,2900518,87442.5%
Oct 5, 2026169,807199411,24341.3%
Oct 2, 2026107,3690346,31031.0%
Oct 1, 202673,3100271,92127.0%
Sep 30, 202696,3902,800214,64744.9%

ATS (dark pool) volume

Weekly volume on alternative trading systems (ATS) and other off-exchange (OTC) venues, from FINRA, for the last 12 weeks. ATS share is ATS volume ÷ (ATS + OTC volume), not a share of all trading.

Weekly ATS and OTC volume in SIMO
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T21,033,64624,6401,088,01125,43448.7%
Sep 28, 2026T2732,19620,004641,26215,19053.3%
Sep 21, 2026T21,074,13727,5761,094,05319,58849.5%
Sep 14, 2026T21,084,58024,4941,238,54521,13946.7%
Sep 7, 2026T2928,53519,074790,93715,96954.0%
Aug 31, 2026T21,028,89223,864853,61714,35254.7%
Aug 24, 2026T2798,42626,8821,045,89623,97243.3%
Aug 17, 2026T21,426,85429,4901,152,66118,70055.3%
Aug 10, 2026T22,300,77244,4473,285,59927,50041.2%
Aug 3, 2026T21,544,12331,6781,017,04119,95260.3%
Jul 27, 2026T22,672,44069,6501,390,69335,25465.8%
Jul 20, 2026T2902,86936,816755,68819,34354.4%