Penbrook Management’s Data I/O DAIO Stock Holding History

Penbrook Management’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 Q1	$903K	Hold	356,850	–	–	0.68%	44
2025 Q4	$1.13M	Buy	356,850 +4,100	+1%	+$12.3K	0.78%	36
2025 Q3	$1.18M	Sell	352,750 -266,450	-43%	-$862K	0.82%	35
2025 Q2	$1.74M	Buy	619,200 +349,750	+130%	+$881K	0.66%	42
2025 Q1	$660K	Sell	269,450 -2,000	-0.7%	-$5.58K	0.5%	46
2024 Q4	$752K	Hold	271,450	–	–	0.51%	47
2024 Q3	$698K	Sell	271,450 -40,600	-13%	-$105K	0.45%	48
2024 Q2	$861K	Hold	312,050	–	–	0.53%	42
2024 Q1	$1.1M	Sell	312,050 -30,300	-9%	-$99.3K	0.68%	34
2023 Q4	$1.01M	Sell	342,350 -1,900	-0.6%	-$6.12K	0.68%	34
2023 Q3	$1.31M	Sell	344,250 -3,000	-0.9%	-$12.1K	0.96%	22
2023 Q2	$1.49M	Hold	347,250	–	–	1.08%	18
2023 Q1	$1.73M	Sell	347,250 -2,500	-0.7%	-$10.9K	1.32%	17
2022 Q4	$1.39M	Sell	349,750 -1,000	-0.3%	-$3.61K	1.18%	21
2022 Q3	$979K	Hold	350,750	–	–	0.84%	31
2022 Q2	$1.08M	Sell	350,750 -200	-0.1%	-$662	0.85%	31
2022 Q1	$1.49M	Hold	350,950	–	–	0.97%	27
2021 Q4	$1.62M	Buy	350,950 +2,000	+0.6%	+$10.7K	0.97%	28
2021 Q3	$2.28M	Sell	348,950 -1,000	-0.3%	-$6.09K	1.42%	15
2021 Q2	$2.38M	Sell	349,950 -7,300	-2%	-$43.4K	1.43%	17
2021 Q1	$1.94M	Sell	357,250 -2,500	-0.7%	-$13.3K	1.39%	19
2020 Q4	$1.48M	Sell	359,750 -5,100	-1%	-$19.7K	1.14%	29
2020 Q3	$1.16M	Buy	364,850 +57,240	+19%	+$201K	1.01%	28
2020 Q2	$1.04M	Buy	307,610 +5,600	+2%	+$17.5K	1.02%	29
2020 Q1	$849K	Sell	302,010 -5,600	-2%	-$20.5K	1.09%	28
2019 Q4	$1.31M	Buy	307,610 +16,000	+5%	+$64.2K	1.27%	24
2019 Q3	$1.14M	Sell	291,610 -2,100	-0.7%	-$8.47K	1.23%	23
2019 Q2	$1.32M	Buy	293,710 +600	+0.2%	+$2.87K	1.42%	16
2019 Q1	$1.63M	Sell	293,110 -13,470	-4%	-$79.2K	1.69%	15
2018 Q4	$1.53M	Hold	306,580	–	–	1.75%	16
2018 Q3	$1.6M	Sell	306,580 -16,200	-5%	-$91K	1.54%	19
2018 Q2	$2.05M	Hold	322,780	–	–	1.97%	10
2018 Q1	$2.4M	Sell	322,780 -125,560	-28%	-$1.25M	2.4%	7
2017 Q4	$5.4M	Buy	+448,340	New	+$5.31M	4.86%	2
2016 Q3	$1.64M	Hold	465,090	–	–	1.76%	12
2016 Q2	$1.09M	Sell	465,090 -12,300	-3%	-$29.8K	1.2%	25
2016 Q1	$1.25M	Sell	477,390 -2,000	-0.4%	-$4.56K	1.38%	20
2015 Q4	$1.21M	Sell	479,390 -7,650	-2%	-$20.9K	1.24%	28
2015 Q3	$1.14M	Sell	487,040 -3,660	-0.7%	-$10.4K	1.2%	31
2015 Q2	$1.68M	Hold	490,700	–	–	1.59%	14
2015 Q1	$1.82M	Sell	490,700 -33,716	-6%	-$111K	1.61%	12
2014 Q4	$1.77M	Sell	524,416 -10,634	-2%	-$35.4K	1.6%	13
2014 Q3	$1.76M	Buy	535,050 +1,500	+0.3%	+$4.63K	1.62%	13
2014 Q2	$1.61M	Sell	533,550 -536,650	-50%	-$1.44M	1.42%	23
2014 Q1	$3.46M	Buy	1,070,200 +532,950	+99%	+$1.47M	1.66%	16
2013 Q4	$1.38M	Buy	+537,250	New	+$1.5M	1.34%	23

Other funds holding DAIO

KWM

Kanen Wealth Management Coconut Creek, Florida $278M AUM 38.85% 1-Year Est. Return

Renaissance Technologies New York $63.9B AUM 45.56% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Kovack Advisors Ft. Lauderdale, Florida $1.87B AUM 29.51% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

EIM

Essex Investment Management Boston, Massachusetts $632M AUM 95.36% 1-Year Est. Return

VFT

Vanguard Fiduciary Trust Malvern, Pennsylvania $396B AUM

SPIA

Steward Partners Investment Advisory New York $19.6B AUM 22.89% 1-Year Est. Return

Penbrook Management's DAIO Position: Q1 2026 in Review

Penbrook Management held its Data I/O (DAIO) position steady in Q1 2026 at 356,850 shares worth $903K. The position accounts for 0.68% of the portfolio, ranked #44.

Penbrook Management first reported a position in DAIO in Q4 2013 and has held it in 46 quarters since. The position peaked at $5.4M in Q4 2017. 29 funds tracked by Wall St. Rank hold DAIO as of Q1 2026.

Penbrook Management held 356,850 shares of Data I/O worth $903K as of Q1 2026.
Penbrook Management left its Data I/O share count unchanged in Q1 2026.
Data I/O made up 0.68% of Penbrook Management's portfolio in Q1 2026, its #44 holding.
Penbrook Management first reported a position in Data I/O in Q4 2013 and has held it in 46 quarters since.
Penbrook Management's Data I/O position peaked at $5.4M in Q4 2017.
29 funds tracked by Wall St. Rank held Data I/O as of Q1 2026.

Based on Penbrook Management's 13F filing for Q1 2026, filed 21 Apr 2026.