Citadel Advisors’s Data I/O DAIO Stock Holding History

Citadel Advisors’s Portfolio DAIO Stock Details DAIO Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	–	Sell	-55,000	Closed	-$139K	–	13877
2026 Q1	$139K	Buy	+55,000	New	+$160K	﹤0.01%	11745
2025 Q4	–	Sell	-79,500	Closed	-$266K	–	12864
2025 Q3	$266K	Buy	+79,500	New	+$257K	﹤0.01%	10635
2025 Q2	–	Sell	-5,500	Closed	-$13.5K	–	12960
2025 Q1	$13.5K	Hold	5,500	–	–	﹤0.01%	13398
2024 Q4	$15.2K	Buy	+5,500	New	+$14.4K	﹤0.01%	13364
2024 Q1	–	Sell	-7,900	Closed	-$23.2K	–	14684
2023 Q4	$23.2K	Buy	7,900 +7,200	+1,029%	+$23.2K	﹤0.01%	12495
2023 Q3	$2.67K	Buy	700 +500	+250%	+$2.02K	﹤0.01%	13689
2023 Q2	$858	Hold	200	–	–	﹤0.01%	14037
2023 Q1	$994	Buy	200 +100	+100%	+$438	﹤0.01%	14384
2022 Q4	$397	Buy	+100	New	+$361	﹤0.01%	14674

Other funds holding DAIO

KWM

Kanen Wealth Management Coconut Creek, Florida $413M AUM 109.83% 1-Year Est. Return

Renaissance Technologies New York $72.6B AUM 54.88% 1-Year Est. Return

Penbrook Management New York $157M AUM 46.57% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Kovack Advisors Ft. Lauderdale, Florida $2.08B AUM 38.95% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return

EIM

Essex Investment Management Boston, Massachusetts $763M AUM 108.51% 1-Year Est. Return

Vanguard Fiduciary Trust Malvern, Pennsylvania $454B AUM

Citadel Advisors's DAIO Position: Q2 2026 in Review

Citadel Advisors opened a new position in Data I/O (DAIO) in Q2 2026: 86,869 shares worth $342K. The stake represents ﹤0.01% of the portfolio and ranks #10825 among its holdings. This is a return to the name: Citadel Advisors previously reported a position in DAIO as recently as Q4 2025.

Citadel Advisors first reported a position in DAIO in Q1 2014 and has held it in 17 quarters since. 35 funds tracked by Wall St. Rank hold DAIO as of Q2 2026.

Citadel Advisors held 86,869 shares of Data I/O worth $342K as of Q2 2026.
Data I/O was a new Citadel Advisors position in Q2 2026.
Data I/O made up ﹤0.01% of Citadel Advisors's portfolio in Q2 2026, its #10825 holding.
Citadel Advisors first reported a position in Data I/O in Q1 2014 and has held it in 17 quarters since.
35 funds tracked by Wall St. Rank held Data I/O as of Q2 2026.

Based on Citadel Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.