Westport Asset Management’s Bio-Rad Laboratories Class A BIO Stock Holding History

Westport Asset Management’s Portfolio BIO Stock Details BIO Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$881K	Hold	3,000	–	–	0.36%	46
2026 Q1	$836K	Hold	3,000	–	–	0.37%	45
2025 Q4	$841K	Hold	3,000	–	–	0.35%	44
2025 Q3	$841K	Hold	3,000	–	–	0.35%	44
2025 Q2	$724K	Hold	3,000	–	–	0.32%	45
2025 Q1	$731K	Hold	3,000	–	–	0.35%	44
2024 Q4	$986K	Hold	3,000	–	–	0.47%	38
2024 Q3	$1M	Hold	3,000	–	–	0.47%	38
2024 Q2	$819K	Buy	3,000 +1,000	+50%	+$291K	0.41%	39
2024 Q1	$692K	Hold	2,000	–	–	0.35%	43
2023 Q4	$646K	Hold	2,000	–	–	0.35%	44
2023 Q3	$717K	Hold	2,000	–	–	0.42%	43
2023 Q2	$758K	Buy	2,000 +500	+33%	+$203K	0.43%	43
2023 Q1	$719K	Hold	1,500	–	–	0.43%	43
2022 Q4	$631K	Hold	1,500	–	–	0.4%	44
2022 Q3	$626K	Hold	1,500	–	–	0.4%	43
2022 Q2	$743K	Hold	1,500	–	–	0.44%	44
2022 Q1	$1.13M	Hold	1,500	–	–	0.51%	39
2021 Q4	$1.13M	Hold	1,500	–	–	0.51%	39
2021 Q3	$1.12M	Hold	1,500	–	–	0.54%	38
2021 Q2	$966K	Hold	1,500	–	–	0.42%	41
2021 Q1	$857K	Hold	1,500	–	–	0.39%	44
2020 Q4	$874K	Hold	1,500	–	–	0.43%	39
2020 Q3	$773K	Hold	1,500	–	–	0.47%	38
2020 Q2	$677K	Hold	1,500	–	–	0.43%	38
2020 Q1	$526K	Buy	+1,500	New	+$552K	0.43%	39

Other funds holding BIO

First Eagle Investment Management New York $60.8B AUM 26.63% 1-Year Est. Return

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

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

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Ariel Investments Chicago, Illinois $10B AUM 42.59% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

EARNEST Partners Atlanta, Georgia $27.7B AUM 52.44% 1-Year Est. Return

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

Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return

Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return

Westport Asset Management's BIO Position: Q2 2026 in Review

Westport Asset Management held its Bio-Rad Laboratories Class A (BIO) position steady in Q2 2026 at 3,000 shares worth $881K. The position accounts for 0.36% of the portfolio, ranked #46.

Westport Asset Management first reported a position in BIO in Q1 2020 and has held it in 26 quarters since. The position peaked at $1.13M in Q1 2022. 399 funds tracked by Wall St. Rank hold BIO as of Q2 2026.

Westport Asset Management held 3,000 shares of Bio-Rad Laboratories Class A worth $881K as of Q2 2026.
Westport Asset Management left its Bio-Rad Laboratories Class A share count unchanged in Q2 2026.
Bio-Rad Laboratories Class A made up 0.36% of Westport Asset Management's portfolio in Q2 2026, its #46 holding.
Westport Asset Management first reported a position in Bio-Rad Laboratories Class A in Q1 2020 and has held it in 26 quarters since.
Westport Asset Management's Bio-Rad Laboratories Class A position peaked at $1.13M in Q1 2022.
399 funds tracked by Wall St. Rank held Bio-Rad Laboratories Class A as of Q2 2026.

Based on Westport Asset Management's 13F filing for Q2 2026, filed 11 Aug 2026.