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Data I/O Corp

DAIO
Exchange
Nasdaq
Industry
Instruments For Meas & Testing of Electricity & Elec Signals
SEC CIK
0000351998

In the last 90 days, Data I/O Corp insiders filed 1 open-market purchase and 0 sales; 35 institutions reported holding it in 13F filings for Q2 2026, worth $12.2M in total; no superinvestor holds 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
11.7K
Shares, settlement Oct 30, 2026
Change
+4.68K
+66.6% vs. Oct 15, 2026
Days to cover
1.00
Short interest ÷ average daily volume
Average daily volume
32.8K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 16,117 sharesNov 15, 2024: 21,943 sharesNov 29, 2024: 15,924 sharesDec 13, 2024: 32,420 sharesDec 31, 2024: 19,868 sharesJan 15, 2025: 15,430 sharesJan 31, 2025: 43,123 sharesFeb 14, 2025: 30,290 sharesFeb 28, 2025: 10,597 sharesMar 14, 2025: 4,040 sharesMar 31, 2025: 11,227 sharesApr 15, 2025: 20,575 sharesApr 30, 2025: 8,572 sharesMay 15, 2025: 16,434 sharesMay 30, 2025: 17,021 sharesJun 13, 2025: 30,545 sharesJun 30, 2025: 17,993 sharesJul 15, 2025: 16,169 sharesJul 31, 2025: 25,567 sharesAug 15, 2025: 39,871 sharesAug 29, 2025: 40,046 sharesSep 15, 2025: 44,725 sharesSep 30, 2025: 49,635 sharesOct 15, 2025: 35,028 sharesOct 31, 2025: 28,914 sharesNov 14, 2025: 21,058 sharesNov 28, 2025: 18,139 sharesDec 15, 2025: 13,517 sharesDec 31, 2025: 18,239 sharesJan 15, 2026: 9,695 sharesJan 30, 2026: 8,444 sharesFeb 13, 2026: 3,947 sharesFeb 27, 2026: 3,538 sharesMar 13, 2026: 3,765 sharesMar 31, 2026: 1,133 sharesApr 15, 2026: 3,562 sharesApr 30, 2026: 2,654 sharesMay 15, 2026: 29,534 sharesMay 29, 2026: 31,567 sharesJun 15, 2026: 7,721 sharesJun 30, 2026: 2,876 sharesJul 15, 2026: 7,404 sharesJul 31, 2026: 12,554 sharesAug 14, 2026: 13,129 sharesAug 31, 2026: 3,449 sharesSep 15, 2026: 6,731 sharesSep 30, 2026: 15,678 sharesOct 15, 2026: 7,033 sharesOct 30, 2026: 11,714 shares
Short interest in DAIO by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 202611.7K+4.68K+66.6%32.8K1.00
Oct 15, 20267.03K−8.64K−55.1%24.0K1.00
Sep 30, 202615.7K+8.95K+132.9%23.4K1.00
Sep 15, 20266.73K+3.28K+95.2%19.5K1.00
Aug 31, 20263.45K−9.68K−73.7%34.4K1.00
Aug 14, 202613.1K+575+4.6%46.1K1.00
Jul 31, 202612.6K+5.15K+69.6%42.2K1.00
Jul 15, 20267.40K+4.53K+157.4%49.1K1.00
Jun 30, 20262.88K−4.84K−62.8%69.2K1.00
Jun 15, 20267.72K−23.8K−75.5%91.1K1.00
May 29, 202631.6K+2.03K+6.9%182.7K1.00
May 15, 202629.5K+26.9K+1,012.8%77.1K1.00
Apr 30, 20262.65K−908−25.5%34.2K1.00
Apr 15, 20263.56K+2.43K+214.4%70.3K1.00
Mar 31, 20261.13K−2.63K−69.9%24.7K1.00
Mar 13, 20263.77K+227+6.4%8.70K1.00
Feb 27, 20263.54K−409−10.4%38.9K1.00
Feb 13, 20263.95K−4.50K−53.3%18.5K1.00
Jan 30, 20268.44K−1.25K−12.9%9.78K1.00
Jan 15, 20269.70K−8.54K−46.8%19.0K1.00
Dec 31, 202518.2K+4.72K+34.9%35.4K1.00
Dec 15, 202513.5K−4.62K−25.5%22.9K1.00
Nov 28, 202518.1K−2.92K−13.9%29.9K1.00
Nov 14, 202521.1K−7.86K−27.2%18.0K1.17
Oct 31, 202528.9K−6.11K−17.5%33.2K1.00
Oct 15, 202535.0K−14.6K−29.4%26.6K1.32
Sep 30, 202549.6K+4.91K+11.0%23.3K2.13
Sep 15, 202544.7K+4.68K+11.7%41.8K1.07
Aug 29, 202540.0K+175+0.4%59.7K1.00
Aug 15, 202539.9K+14.3K+56.0%33.8K1.18
Jul 31, 202525.6K+9.40K+58.1%54.8K1.00
Jul 15, 202516.2K−1.82K−10.1%25.5K1.00
Jun 30, 202518.0K−12.6K−41.1%53.3K1.00
Jun 13, 202530.5K+13.5K+79.5%21.5K1.42
May 30, 202517.0K+587+3.6%27.4K1.00
May 15, 202516.4K+7.86K+91.7%35.9K1.00
Apr 30, 20258.57K−12.0K−58.3%36.2K1.00
Apr 15, 202520.6K+9.35K+83.3%26.4K1.00
Mar 31, 202511.2K+7.19K+177.9%8.86K1.27
Mar 14, 20254.04K−6.56K−61.9%22.7K1.00
Feb 28, 202510.6K−19.7K−65.0%25.3K1.00
Feb 14, 202530.3K−12.8K−29.8%15.3K1.98
Jan 31, 202543.1K+27.7K+179.5%21.3K2.03
Jan 15, 202515.4K−4.44K−22.3%24.4K1.00
Dec 31, 202419.9K−12.6K−38.7%25.8K1.00
Dec 13, 202432.4K+16.5K+103.6%51.6K1.00
Nov 29, 202415.9K−6.02K−27.4%40.4K1.00
Nov 15, 202421.9K+5.83K+36.2%23.4K1.00
Oct 31, 202416.1K+4.86K+43.2%26.0K1.00

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 DAIO by settlement date
Settlement dateSharesPriceValue
Aug 20, 2026576$2.88$1.66K
Jun 24, 202663$3.85$242.55
May 4, 202612$2.76$33.12
Apr 17, 20261,206$2.62$3.16K
Apr 16, 2026371$2.51$931.21
Mar 19, 2026332$2.59$859.88
Feb 25, 2026136$2.81$382.16
Feb 18, 2026788$2.83$2.23K
Feb 12, 2026681$3.08$2.10K
Feb 4, 202651$3.19$162.69
Feb 3, 2026316$3.09$976.44
Feb 2, 2026703$3.10$2.18K
Jan 30, 2026573$3.14$1.80K
Jan 26, 202692$3.20$294.4
Jan 23, 2026147$3.22$473.34
Jan 16, 20264,137$3.30$13.7K
Jan 14, 20263,978$3.02$12.0K
Jan 13, 2026502$3.19$1.60K
Jan 7, 2026121$3.12$377.52
Jan 5, 20263,500$3.30$11.6K
Jan 2, 20263,758$3.17$11.9K
Dec 30, 20251,014$3.38$3.43K
Dec 29, 20255,012$3.22$16.1K
Dec 22, 2025383$2.99$1.15K
Dec 17, 202537$3.11$115.07
Dec 15, 2025819$3.13$2.56K
Dec 11, 20252,297$3.13$7.19K
Dec 8, 20254,230$2.97$12.6K
Dec 4, 2025420$2.80$1.18K
Nov 28, 2025244$2.80$683.2

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 DAIO by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 20262,48702,60995.3%
Nov 9, 20263,0311016,46318.4%
Nov 6, 20263,54407,86045.1%
Nov 5, 202610,666040,95826.0%
Nov 4, 20261,94607,29026.7%
Nov 3, 202610,641013,34079.8%
Nov 2, 202626406,1714.3%
Oct 30, 20261,43708,52716.9%
Oct 29, 20264,000011,80133.9%
Oct 28, 20264,35507,56957.5%
Oct 27, 202670501,08565.0%
Oct 26, 202624006,4933.7%
Oct 23, 202653007,8796.7%
Oct 22, 20266,490038,17917.0%
Oct 21, 20264,194024,74516.9%
Oct 20, 20264,168018,45622.6%
Oct 19, 202614,785039,63937.3%
Oct 16, 20262,434022,99710.6%
Oct 15, 20261,525012,81811.9%
Oct 14, 202612,448028,85843.1%
Oct 13, 20262,832014,83319.1%
Oct 12, 20265,514018,81529.3%
Oct 9, 202613,372020,57865.0%
Oct 8, 20264,40509,89344.5%
Oct 7, 20265,643012,99443.4%
Oct 6, 20269,2685,00010,26190.3%
Oct 5, 20264,0463,40013,57229.8%
Oct 2, 20263,737011,44332.7%
Oct 1, 20268,627022,51238.3%
Sep 30, 202611,945032,31537.0%

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 DAIO
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T25,27411663,0562767.7%
Sep 28, 2026T221,89917658,69271327.2%
Sep 21, 2026T23,5028722,73447513.3%
Sep 14, 2026T241,26726244,49963248.1%
Sep 7, 2026T211,01931326,23719329.6%
Aug 31, 2026T27,53616645,15732314.3%
Aug 24, 2026T27,03519436,60633216.1%
Aug 17, 2026T210,279445126,4603827.5%
Aug 10, 2026T226,820400135,01462016.6%
Aug 3, 2026T24,82619286,4235005.3%
Jul 27, 2026T218,721317124,84056213.0%
Jul 20, 2026T214,90833987,24050114.6%