Stock

Data I/O Corp

DAIO · held by 27 managers

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025

Reported value

$6.31M

Holders

+0 new · −0 exited

Holders’ est. mark

−$15

Price effect on 1 books still in the name

Largest holder

$1.39M

Renaissance Technologies

Notable conviction

Share of each notable manager’s 13F book.

Renaissance Technologies0.0% · $1.39M
Citadel0.0% · $104.2K
State Street0.0% · $51.3K
Vanguard0.0% · $1.11M

Holder count by quarter

Q3 2025 Q4 2025 Q1 2026

Who holds it

Notable only

Investor	Shares	Value	Est. mark	Change
Renaissance Technologies	437.6K	$1.39M	—	Held
Penbrook Management LLC	356.9K	$1.13M	—	Held
Vanguard	350.4K	$1.11M	—	Held
Kovack Advisors, Inc.	268.9K	$852.4K	—	Held
DIMENSIONAL FUND ADVISORS LP	180.2K	$571.4K	—	Held
GEODE CAPITAL MANAGEMENT, LLC	104.6K	$331.6K	—	Held
ESSEX INVESTMENT MANAGEMENT CO LLC	74.6K	$236.6K	—	Held
Steward Partners Investment Advisory, LLC	43.5K	$137.8K	—	Held
Citadel	32.9K	$104.2K	—	Held
JAMES INVESTMENT RESEARCH, INC.	22.4K	$71K	—	Held
NewEdge Advisors, LLC	22.4K	$71K	—	Held
Legato Capital Management LLC	17.6K	$55.6K	—	Held
BlackRock, Inc.	17K	$53.9K	—	Held
State Street	16.2K	$51.3K	—	Held
SUSQUEHANNA INTERNATIONAL GROUP, LLP	15.7K	$49.8K	—	Held
NORTHERN TRUST CORP	13.5K	$42.7K	—	Held
DRW Securities, LLC	11.7K	$37.2K	—	Held
Tower Research Capital LLC (TRC)	2.13K	$6.75K	—	Held
SIMPLEX TRADING, LLC	1.93K	$6.12K	—	Held
Kanen Wealth Management LLC	839.4K	$1.73K	—	Held
ACADIAN ASSET MANAGEMENT LLC	125.2K	$396	—	Held
BARD ASSOCIATES INC	100	$317	—	Held
BANK OF AMERICA CORP /DE/	87	$275	−$15	Cut−$9
HUNTINGTON NATIONAL BANK	1	$3	—	Held
SBI Securities Co., Ltd.	1	$3	—	Held
Capital Analysts, LLC	159	$1	—	Held
ROYAL BANK OF CANADA	110	$0	—	Held

Positions as of Q4 2025. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.