Oberweis Asset Management’s PDF Solutions PDFS Stock Holding History

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

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$30.2M	Buy	+426,400	New	+$21.1M	0.62%	59
2024 Q1	–	Sell	-69,500	Closed	-$2.23M	–	212
2023 Q4	$2.23M	Buy	69,500 +3,500	+5%	+$106K	0.21%	165
2023 Q3	$2.14M	Buy	66,000 +11,500	+21%	+$440K	0.23%	150
2023 Q2	$2.46M	Buy	54,500 +11,500	+27%	+$469K	0.3%	121
2023 Q1	$1.82M	Buy	43,000 +12,900	+43%	+$452K	0.28%	119
2022 Q4	$858K	Buy	+30,100	New	+$813K	0.18%	139
2013 Q4	–	Sell	-38,300	Closed	-$813K	–	150
2013 Q3	$813K	Sell	38,300 -15,300	-29%	-$315K	0.23%	68
2013 Q2	$988K	Buy	+53,600	New	+$933K	0.28%	73

Other funds holding PDFS

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

NIM

Needham Investment Management New York $3.33B AUM 163.16% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Wasatch Advisors Salt Lake City, Utah $15.3B AUM 25.06% 1-Year Est. Return

Barrow, Hanley, Mewhinney & Strauss Dallas, Texas $33B AUM 40.62% 1-Year Est. Return

RIM

Ranger Investment Management Dallas, Texas $1.58B AUM 51% 1-Year Est. Return

SCM

Snyder Capital Management San Francisco, California $5.79B AUM 33.56% 1-Year Est. Return

Jupiter Topco New York $245B AUM

Oberweis Asset Management's PDFS Position: Q2 2026 in Review

Oberweis Asset Management opened a new position in PDF Solutions (PDFS) in Q2 2026: 426,400 shares worth $30.2M. The stake represents 0.62% of the portfolio and ranks #59 among its holdings. This is a return to the name: Oberweis Asset Management previously reported a position in PDFS as recently as Q4 2023.

Oberweis Asset Management first reported a position in PDFS in Q2 2013 and has held it in 8 quarters since. 284 funds tracked by Wall St. Rank hold PDFS as of Q2 2026.

Oberweis Asset Management held 426,400 shares of PDF Solutions worth $30.2M as of Q2 2026.
PDF Solutions was a new Oberweis Asset Management position in Q2 2026.
PDF Solutions made up 0.62% of Oberweis Asset Management's portfolio in Q2 2026, its #59 holding.
Oberweis Asset Management first reported a position in PDF Solutions in Q2 2013 and has held it in 8 quarters since.
284 funds tracked by Wall St. Rank held PDF Solutions as of Q2 2026.

Based on Oberweis Asset Management's 13F filing for Q2 2026, filed 14 Aug 2026.