Parnassus Investments’s Bio-Rad Laboratories Class A BIO Stock Holding History

Parnassus Investments’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	–	Sell	-254,305	Closed	-$70.9M	–	138
2026 Q1	$70.9M	Buy	254,305 +2,165	+0.9%	+$624K	0.21%	66
2025 Q4	$76.4M	Sell	252,140 -63,188	-20%	-$19.7M	0.2%	71
2025 Q3	$88.4M	Sell	315,328 -1,890	-0.6%	-$514K	0.2%	65
2025 Q2	$76.6M	Sell	317,218 -893	-0.3%	-$211K	0.18%	73
2025 Q1	$77.5M	Buy	318,111 +7,244	+2%	+$2.18M	0.19%	82
2024 Q4	$102M	Buy	310,867 +135	+0%	+$45.8K	0.23%	64
2024 Q3	$104M	Hold	310,732	–	–	0.22%	64
2024 Q2	$84.9M	Buy	310,732 +72,942	+31%	+$21.2M	0.18%	73
2024 Q1	$82.2M	Hold	237,790	–	–	0.18%	81
2023 Q4	$76.8M	Buy	237,790 +16,999	+8%	+$5.33M	0.17%	91
2023 Q3	$79.1M	Buy	+220,791	New	+$85.2M	0.19%	89

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

Parnassus Investments's BIO Position: Q2 2026 in Review

Parnassus Investments sold out of Bio-Rad Laboratories Class A (BIO) in Q2 2026, closing a stake of 254,305 shares — an estimated $70.9M sold.

Parnassus Investments first reported a position in BIO in Q3 2023 and held it in 11 quarters. The position peaked at $104M in Q3 2024. 398 funds tracked by Wall St. Rank hold BIO as of Q2 2026.

Parnassus Investments reported no remaining Bio-Rad Laboratories Class A position as of Q2 2026 after selling out during the quarter.
Parnassus Investments sold 254,305 Bio-Rad Laboratories Class A shares in Q2 2026, an estimated $70.9M.
Parnassus Investments first reported a position in Bio-Rad Laboratories Class A in Q3 2023 and held it in 11 quarters.
Parnassus Investments's Bio-Rad Laboratories Class A position peaked at $104M in Q3 2024.
398 funds tracked by Wall St. Rank held Bio-Rad Laboratories Class A as of Q2 2026.

Based on Parnassus Investments's 13F filing for Q2 2026, filed 29 Jul 2026.