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Data I/O Corp (DAIO)

CUSIP: 237690102 | NYSE | Technology · Electronic Components | Micro Cap | 132 institutional holders

Quarters

Q3 2026Q2 2026Q1 2026Q4 2025Q3 2025
CompareDetailedHistoricalFundsOptions13D/13GPeersTargetingTrading SummaryProfile

Beneficial Ownership — 13D / 13G

Full history →

5%+ stakes reported outside the quarterly cycle. A 13D is due within five business days of the event below, so these figures lead the holders table until the filer's next 13F catches up to them.

HolderShares% of ClassChangeEvent Datevs 13F
13GRed Oak Partners, LLC
with The Red Oak Fund, LP, The Red Oak Long Fund, LP
1,492,53611.2%New 5%+ stakeOct 20, 2026No 13F filer matched
13GRed Oak Partners, LLC1,492,536
11.2% of class · Oct 20, 2026New 5%+ stake
with The Red Oak Fund, LP, The Red Oak Long Fund, LP
No 13F filer matched

Institutional Holders — Q3 2026

Penbrook Management LLC355,850
0.6% of portfolio›$1.0M
Dimensional Fund Advisors LP140,679
0.0% of portfolio›$412.2K
Geode Capital Management, LLC115,305
0.0% of portfolio›$337.9K
Essex Investment Management Co LLC74,558
0.0% of portfolio›$218.5K
James Investment Research, Inc.22,402
0.0% of portfolio›$65.6K
LPL Financial LLC20,000
0.0% of portfolio›$58.6K
Simplex Trading, LLC1,397
0.0% of portfolio›$4.1K
Barclays PLC5
0.0% of portfolio›$15
Caitong International Asset Management Co., Ltd4
0.0% of portfolio›$12
SBI Securities Co., Ltd.1
0.0% of portfolio›$3
StyleTurnoverLocationFiled
Penbrook Management LLC
355,850$1.0M0.6%CoreLowNew York, NY2026-10-16
Dimensional Fund Advisors LP
140,679$412.2K0.0%IndexLowAustin, TX2026-11-04
Geode Capital Management, LLC
115,305$337.9K0.0%IndexVery LowBoston, MA2026-11-06
Essex Investment Management Co LLC
74,558$218.5K0.0%GrowthMediumBoston, MA2026-10-19
James Investment Research, Inc.
22,402$65.6K0.0%CoreLowAlpha, OH2026-10-22
LPL Financial LLC
20,000$58.6K0.0%IndexVery LowFort Mill, SC2026-11-06
Simplex Trading, LLC
1,397$4.1K0.0%CoreVery HighChicago, IL2026-11-04
Barclays PLC
5$150.0%CoreMediumLondon, United Kingdom2026-11-06
Caitong International Asset Management Co., Ltd
4$120.0%GrowthVery HighHong Kong, South Korea2026-10-29
SBI Securities Co., Ltd.
1$30.0%Agg GrowthLowTokyo, Mexico2026-10-22