DAIO · Data I/O Corp · Shareholders & Ownership

$2.46 -0.03 (-1.20%) At close · Oct 23

Market Cap

$25.57M

10.40M

Volume · Oct 23 34.51K Avg daily vol (3M) 33.99K

Every disclosed holder of DAIO in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns DAIO

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	35	3,107,594	29.89%	Yes
Insiders (Forms 3, 4, 5)	7	484,714	4.66%	Yes
13D/G-only blocks	2	1,865,845	17.95%	Yes
Remaining	—	4,937,474	47.50%	Rest
Registered funds (N-PORT, not summed)	20	813,684	7.83%	No

Shares outstanding: 10,395,627, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of DAIO

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	Lytton, Laurence W. 13G CIK 1105806 · Unknown · Jun 17, 2026 Rule 13d-1(c), passive investor	1,026,424	9.87%	—	Jun 17, 2026	Rule 13d-1(c), passive investor
2	Kanen Wealth Management LLC 13F CIK 1681614 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	839,421	8.07%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
3	Philotimo Fund, LP 13G CIK 1688522 · Investment adviser · May 22, 2025 Rule 13d-1(c), passive investor	839,421	8.07%	+13,000	May 22, 2025	Rule 13d-1(c), passive investor
4	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	392,443	3.78%	-15,200	Jun 30, 2026	carried, not yet filed for the newest quarter
5	Penbrook Management LLC 13F CIK 1381055 · Registered investment adviser · Sep 30, 2026	355,850	3.42%	0	Sep 30, 2026
6	Philotimo Focused Growth & Income Fund S000071684 · Registered fund · Jun 30, 2026 World Funds Trust, not summed	327,401	3.15%	0	Jun 30, 2026	World Funds Trust, not summed
7	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	323,672	3.11%	+24,275	Jun 30, 2026	carried, not yet filed for the newest quarter
8	Kovack Advisors, Inc. 13F CIK 1728321 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	285,481	2.75%	+17,500	Jun 30, 2026	carried, not yet filed for the newest quarter
9	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	214,242	2.06%	+5,461	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
10	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	140,679	1.35%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
10.1	U.S. MICRO CAP PORTFOLIO Fund S000000948 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	46,137	0.44%	0	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
10.2	U.S. SMALL CAP PORTFOLIO Fund S000000971 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	31,665	0.30%	0	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
10.3	U.S. Sustainability Core 1 Portfolio Fund S000020422 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	4,622	0.04%	0	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
10.4	U.S. CORE EQUITY 2 PORTFOLIO Fund S000000980 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	4,203	0.04%	0	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
10.5	Dimensional US Core Equity 1 ETF Fund S000081780 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	3,526	0.03%	0	Jul 31, 2026	Dimensional ETF Trust, not summed
11	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	115,057	1.11%	+28,190	Jun 30, 2026	carried, not yet filed for the newest quarter
12	ACADIAN ASSET MANAGEMENT LLC 13F CIK 916542 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	108,582	1.04%	-15,537	Jun 30, 2026	carried, not yet filed for the newest quarter
13	Brown Douglas Wells Insider CIK 1517364 · May 15, 2025 Director, issuer-wide	101,759	0.98%	+20,300	May 15, 2025	Director, issuer-wide
14	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	90,237	0.87%	-379	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
15	DiBona Charles Joseph Insider CIK 2085550 · Sep 1, 2026 Vice President & CFO, issuer-wide	89,655	0.86%	-10,345	Sep 1, 2026	Vice President & CFO, issuer-wide
16	Washlow Sally A. Insider CIK 1498395 · Jul 8, 2026 Director, Chief Executive Officer, issuer-wide	88,911	0.86%	+16,260	Jul 8, 2026	Director, Chief Executive Officer, issuer-wide
17	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	86,869	0.84%	+86,869	Jun 30, 2026	carried, not yet filed for the newest quarter
18	SMITH EDWARD J Insider CIK 1216591 · Jul 8, 2026 Director, issuer-wide	79,375	0.76%	+16,260	Jul 8, 2026	Director, issuer-wide
19	ESSEX INVESTMENT MANAGEMENT CO LLC 13F CIK 201772 · Registered investment adviser · Sep 30, 2026	74,558	0.72%	0	Sep 30, 2026
20	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	58,643	0.56%	+12,790	Jun 30, 2026	carried, not yet filed for the newest quarter
21	Wentworth William O. Insider CIK 1977418 · Dec 3, 2025 Director, President, issuer-wide	53,972	0.52%	+1,100	Dec 3, 2025	Director, President, issuer-wide
22	SUSQUEHANNA INTERNATIONAL GROUP, LLP 13F CIK 1446194 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	48,548	0.47%	+21,711	Jun 30, 2026	carried, not yet filed for the newest quarter
23	Larson Garrett Riley Insider CIK 2053022 · Jul 8, 2026 Director, issuer-wide	46,832	0.45%	+16,260	Jul 8, 2026	Director, issuer-wide
24	Steward Partners Investment Advisory, LLC 13F CIK 1723397 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	43,472	0.42%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
25	Fidelity Extended Market Index Fund Fund S000006021 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	25,475	0.25%	-18,915	May 31, 2026	Fidelity Concord Street Trust, not summed
26	WASZAK STEVEN M Insider CIK 1212509 · Jul 8, 2026 Director, issuer-wide	24,210	0.23%	+16,260	Jul 8, 2026	Director, issuer-wide
27	THOMPSON DAVIS & CO., INC. 13F CIK 1017284 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	23,533	0.23%	+23,533	Jun 30, 2026	carried, not yet filed for the newest quarter
28	JAMES INVESTMENT RESEARCH, INC. 13F CIK 810384 · Registered investment adviser · Sep 30, 2026	22,402	0.22%	0	Sep 30, 2026
29	NewEdge Advisors, LLC 13F CIK 1633516 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	22,402	0.22%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
30	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	21,827	0.21%	+8,351	Jun 30, 2026	carried, not yet filed for the newest quarter
31	LPL Financial LLC 13F CIK 1403438 · Broker-dealer · Jun 30, 2026 carried, not yet filed for the newest quarter	21,000	0.20%	-1,545	Jun 30, 2026	carried, not yet filed for the newest quarter
32	Fidelity Total Market Index Fund Fund S000006026 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	19,731	0.19%	0	May 31, 2026	Fidelity Concord Street Trust, not summed
33	JANE STREET GROUP, LLC 13F CIK 1595888 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	17,727	0.17%	+17,727	Jun 30, 2026	carried, not yet filed for the newest quarter
34	Legato Capital Management LLC 13F CIK 1442641 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	17,550	0.17%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
35	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	17,015	0.16%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
36	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	16,170	0.16%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
37	XTX Topco Ltd 13F CIK 1828301 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	15,284	0.15%	+15,284	Jun 30, 2026	carried, not yet filed for the newest quarter
38	Fidelity Nasdaq Composite Index Fund Fund S000055366 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	15,054	0.14%	0	May 31, 2026	Fidelity Concord Street Trust, not summed
39	HRT FINANCIAL LP 13F CIK 1475597 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	11,288	0.11%	+11,288	Jun 30, 2026	carried, not yet filed for the newest quarter
40	Fidelity Series Total Market Index Fund Fund S000065248 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	11,134	0.11%	0	May 31, 2026	Fidelity Concord Street Trust, not summed
41	CITIGROUP INC 13F CIK 831001 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	7,176	0.07%	+7,176	Jun 30, 2026	carried, not yet filed for the newest quarter
42	LVIP Dimensional U.S. Core Equity 2 Fund Fund S000048564 · Registered fund · Jun 30, 2026 LINCOLN VARIABLE INSURANCE PRODUCTS TRUST, not summed	7,146	0.07%	0	Jun 30, 2026	LINCOLN VARIABLE INSURANCE PRODUCTS TRUST, not summed
43	GROUP ONE TRADING LLC 13F CIK 932540 · Broker-dealer · Jun 30, 2026 carried, not yet filed for the newest quarter	6,450	0.06%	+6,350	Jun 30, 2026	carried, not yet filed for the newest quarter
44	Vanguard Global Advisers, LLC 13F CIK 1811242 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	5,124	0.05%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
45	SIMPLEX TRADING, LLC 13F CIK 1488542 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	4,279	0.04%	+1,520	Jun 30, 2026	carried, not yet filed for the newest quarter
46	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	4,222	0.04%	+3,281	Jun 30, 2026	carried, not yet filed for the newest quarter
47	Point Nemo Capital, LLC 13F CIK 1988307 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	500	0.00%	+500	Jun 30, 2026	carried, not yet filed for the newest quarter
48	Tower Research Capital LLC (TRC) 13F CIK 1533421 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	314	0.00%	-1,367	Jun 30, 2026	carried, not yet filed for the newest quarter
49	VANGUARD BALANCED INDEX FUND Fund S000002560 · Registered fund · Jun 30, 2026 VANGUARD VALLEY FORGE FUNDS, not summed	301	0.00%	—	Jun 30, 2026	VANGUARD VALLEY FORGE FUNDS, not summed
50	BARCLAYS PLC 13F CIK 312069 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	50	0.00%	+50	Jun 30, 2026	carried, not yet filed for the newest quarter

6 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 53 holders

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Key facts CIK 351998 CUSIP 237690102 13F (30d) 4 filings 4 filers Visit website Investor relations