Does Marshall Wace own BIO stock?

Yes. As of its Q2 2026 13F, Marshall Wace holds 18,980 shares of BIO (Bio-Rad Laboratories), worth $5.6M.

How many shares of BIO does Marshall Wace own?

As of its Q2 2026 13F, Marshall Wace holds 18,980 shares of BIO (Bio-Rad Laboratories).

As of its Q2 2026 13F, Marshall Wace's BIO position is worth $5.6M.

In Q2 2026, Marshall Wace reduced its BIO position by 14,237 shares (-42.9%).

Marshall Wace already held BIO in its Q4 2018 13F, the earliest on record, and has listed it in 27 quarterly 13F filings.

Position history for MWMARSHALL WACE, LLP's holdings in Bio-Rad Laboratories, Inc.

Current Value

$5.6M

Current Shares

18,980

Total Value Change

+$3.4M

Total Shares Change

+9,784

Quarter-by-Quarter History

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Decreased	18,980	-42.9%	$5.6M	0.0%	$293.61	0
2026-Q1	Increased	33,217	+187.3%	$9.3M	0.0%	$278.75	45
2025-Q4	Decreased	11,560	-8.4%	$3.5M	0.0%	$302.99	0
2025-Q3	Increased	12,614	+1262.2%	$3.5M	0.0%	$280.39	43
2025-Q2	Decreased	926	-96.6%	$223,462	0.0%	$241.32	0
2025-Q1	Increased	27,095	+1088.9%	$6.6M	0.0%	$243.56	44
2024-Q4	New	2,279	-	$748,674	0.0%	$328.51	34
2024-Q1	Exited	0	-100.0%	$0	0.0%	$345.87	0
2023-Q4	Decreased	6,300	-95.0%	$2M	0.0%	$322.89	0
2023-Q3	Increased	125,650	+540.6%	$45M	0.1%	$358.45	47
2023-Q2	Decreased	19,613	-41.2%	$7.4M	0.0%	$379.12	0
2023-Q1	Increased	33,362	+5507.1%	$16M	0.0%	$479.02	45
2022-Q4	Decreased	595	-99.7%	$250,192	0.0%	$420.49	0
2022-Q3	Decreased	172,600	-23.2%	$72M	0.2%	$417.14	0
2022-Q2	Decreased	224,769	-51.9%	$111.3M	0.2%	$495.00	0
2022-Q1	Increased	467,343	+40.2%	$263.2M	0.5%	$563.23	49
2021-Q4	Decreased	333,370	-24.1%	$251.9M	0.5%	$755.57	0
2021-Q3	Increased	439,344	+1.0%	$327.7M	1.4%	$745.95	49
2021-Q2	Decreased	435,099	-23.5%	$280.3M	1.3%	$644.29	0
2021-Q1	Increased	568,918	+54.0%	$324.9M	1.5%	$571.17	69
2020-Q4	Increased	369,411	+31.7%	$215.3M	1.2%	$582.94	61
2020-Q3	Increased	280,567	+20.4%	$144.6M	0.9%	$515.46	51
2020-Q2	Increased	233,102	+107.7%	$105.2M	0.7%	$451.49	68
2020-Q1	Increased	112,252	+130x	$39.4M	0.4%	$350.56	56
2019-Q4	Decreased	859	-98.9%	$318,000	0.0%	$370.03	0
2019-Q3	Increased	78,756	+266.7%	$26.2M	0.2%	$332.74	55
2019-Q2	New	21,475	-	$6.7M	0.1%	$312.59	38
2019-Q1	Exited	0	-100.0%	$0	0.0%	$305.68	0
2018-Q4	First report	9,196	-	$2.1M	0.0%	$232.22	0

Other major holders of BIO: FMR LLC