Oberweis Asset Management’s Diodes DIOD Stock Holding History

Oberweis Asset Management’s Portfolio DIOD Stock Details DIOD Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$15.3M	Buy	224,300 +72,400	+48%	+$4.57M	0.45%	89
2025 Q4	$7.49M	Sell	151,900 -66,800	-31%	-$3.38M	0.27%	128
2025 Q3	$11.6M	Hold	218,700	–	–	0.45%	86
2025 Q2	$11.6M	Buy	+218,700	New	+$9.62M	0.5%	78
2022 Q3	–	Sell	-6,900	Closed	-$446K	–	172
2022 Q2	$446K	Buy	6,900 +2,000	+41%	+$146K	0.11%	124
2022 Q1	$426K	Buy	4,900 +1,500	+44%	+$137K	0.09%	122
2021 Q4	$373K	Buy	+3,400	New	+$345K	0.07%	120
2014 Q4	–	Sell	-14,800	Closed	-$354K	–	131
2014 Q3	$354K	Sell	14,800 -30,100	-67%	-$796K	0.1%	104
2014 Q2	$1.3M	Sell	44,900 -9,000	-17%	-$249K	0.32%	69
2014 Q1	$1.41M	Buy	53,900 +16,700	+45%	+$401K	0.3%	68
2013 Q4	$876K	Sell	37,200 -3,200	-8%	-$72.2K	0.21%	80
2013 Q3	$990K	Buy	+40,400	New	+$1.05M	0.28%	61

Other funds holding DIOD

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

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

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

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

EARNEST Partners Atlanta, Georgia $24.3B AUM 34.41% 1-Year Est. Return

Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

Oberweis Asset Management's DIOD Position: Q1 2026 in Review

Oberweis Asset Management increased its Diodes (DIOD) stake by 48% in Q1 2026, buying an estimated $4.57M and bringing the position to 224,300 shares worth $15.3M. The position accounts for 0.45% of the portfolio, ranked #89.

Oberweis Asset Management first reported a position in DIOD in Q3 2013 and has held it in 12 quarters since. 335 funds tracked by Wall St. Rank hold DIOD as of Q1 2026.

Oberweis Asset Management held 224,300 shares of Diodes worth $15.3M as of Q1 2026.
Oberweis Asset Management bought 72,400 Diodes shares in Q1 2026, an estimated $4.57M.
Diodes made up 0.45% of Oberweis Asset Management's portfolio in Q1 2026, its #89 holding.
Oberweis Asset Management first reported a position in Diodes in Q3 2013 and has held it in 12 quarters since.
335 funds tracked by Wall St. Rank held Diodes as of Q1 2026.

Based on Oberweis Asset Management's 13F filing for Q1 2026, filed 15 May 2026.