DAIO · Data I/O Corp

$2.84 +0.00 (+0.00%) At close · Sep 4

Market Cap

$29.52M

10.40M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP →

Quarter:

Holders: 35

Total Value: $12,243,903

Total Shares: 3,107,594

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 35 13F filers · Δ vs Mar 31, 2026

Top Holder

27.0%

−1.2 pts

Top 5

70.7%

−2.2 pts

Top 10

87.6%

−3.2 pts

HHI

1,285

Broadly held−99

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +5

Institutional value: +62.5%

Shares held: +4.4%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mega GEODE CAPITAL MANAGEMENT, LLC	+28,190	115,057
Mega VANGUARD CAPITAL MANAGEMENT LLC	+24,275	323,672
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	+21,711	48,548
Mid Kovack Advisors, Inc.	+17,500	285,481
Mega VANGUARD FIDUCIARY TRUST CO	+12,790	58,643

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mega CITADEL ADVISORS LLC	−20,531	86,869
Large ACADIAN ASSET MANAGEMENT LLC	−15,537	108,582
Large RENAISSANCE TECHNOLOGIES LLC	−15,200	392,443
Mega LPL Financial LLC	−1,545	21,000
Mid Tower Research Capital LLC (TRC)	−1,367	314

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Small THOMPSON DAVIS & CO., INC.	23,533	$92,720
Mega JANE STREET GROUP, LLC	17,727	$69,844
Mid XTX Topco Ltd	15,284	$60,218
Large HRT FINANCIAL LP	11,288	$44,474
Mega CITIGROUP INC	7,176	$28,273

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Mega GOLDMAN SACHS GROUP INC	13,788	$34,883
Mega ROYAL BANK OF CANADA	136	$344
Small BARD ASSOCIATES INC	100	$253

Filter: New 8 Increased 9 Reduced 7 Sold out 3 Unchanged 11

Showing 35 of 35

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

Kanen Wealth Management LLC

$3,307,318

27.01%

839,421

RENAISSANCE TECHNOLOGIES LLC

$1,546,225

12.63%

392,443

Penbrook Management LLC

$1,402,049

11.45%

355,850

VANGUARD CAPITAL MANAGEMENT LLC

$1,275,267

10.42%

323,672

Kovack Advisors, Inc.

$1,124,795

9.19%

285,481

DIMENSIONAL FUND ADVISORS LP

$554,274

4.53%

140,679

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Ireland Ltd	3,073	$12,107	2.2%	Defined
Held directly	137,606	$542,167	97.8%	Sole

GEODE CAPITAL MANAGEMENT, LLC

$453,323

3.70%

115,057

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	15,451	$60,876	13.4%	Defined
Held directly	99,606	$392,447	86.6%	Defined

ACADIAN ASSET MANAGEMENT LLC

$427,813

3.49%

108,582

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Acadian Inc	108,582	$427,813	100.0%	Defined

CITADEL ADVISORS LLC

$342,263

2.80%

86,869

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	86,869	$342,263	100.0%	Defined

ESSEX INVESTMENT MANAGEMENT CO LLC

$293,758

2.40%

74,558

VANGUARD FIDUCIARY TRUST CO

$231,053

1.89%

58,643

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$191,279

1.56%

48,548

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	48,548	$191,279	100.0%	Other

Steward Partners Investment Advisory, LLC

$171,279

1.40%

43,472

THOMPSON DAVIS & CO., INC.

$92,720

0.76%

23,533

JAMES INVESTMENT RESEARCH, INC.

$88,263

0.72%

22,402

NewEdge Advisors, LLC

$88,263

0.72%

22,402

NORTHERN TRUST CORP

$85,998

0.70%

21,827

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	21,827	$85,998	100.0%	Defined

LPL Financial LLC

$82,740

0.68%

21,000

JANE STREET GROUP, LLC

$69,844

0.57%

17,727

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	15,231	$60,010	85.9%	Defined
Jane Street Global Trading, LLC	2,496	$9,834	14.1%	Defined

Legato Capital Management LLC

$69,147

0.56%

17,550

BlackRock, Inc.

$67,039

0.55%

17,015

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BlackRock Institutional Trust Company, N.A.	17,015	$67,039	100.0%	Sole

STATE STREET CORP

$63,709

0.52%

16,170

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS TRUST COMPANY	16,170	$63,709	100.0%	Defined

XTX Topco Ltd

$60,218

0.49%

15,284

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	15,284	$60,218	100.0%	Defined

HRT FINANCIAL LP

$44,474

0.36%

11,288

CITIGROUP INC

$28,273

0.23%

7,176

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	7,176	$28,273	100.0%	Defined

GROUP ONE TRADING LLC

$25,413

0.21%

6,450

Vanguard Global Advisers, LLC

$20,188

0.16%

5,124

SIMPLEX TRADING, LLC

$16,859

0.14%

4,279

UBS Group AG

$16,634

0.14%

4,222

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Securities LLC	4,222	$16,634	100.0%	Defined

Point Nemo Capital, LLC

$1,970

0.02%

500

Tower Research Capital LLC (TRC)

$1,237

0.01%

314

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	314	$1,237	100.0%	Defined

BARCLAYS PLC

$197

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS CAPITAL INC.	50	$197	100.0%	Defined

Caitong International Asset Management Co., Ltd

$15

0.00%

HUNTINGTON NATIONAL BANK

0.00%

SBI Securities Co., Ltd.

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	13,788	$34,883	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC Capital Markets, LLC	136	$344	100.0%	Defined

Key facts CIK 351998 CUSIP 237690102 13F (30d) 22 filings 22 filers Visit website Investor relations