Citadel Advisors
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Citadel Advisors’s Bio-Rad Laboratories Class A BIO Stock Holding History

Citadel Advisors’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
2025
Q4 		– Sell
-1,000
Closed -$280K – 12691
2025
Q3 		$280K Sell
1,000
-18,200
-95% -$4.95M ﹤0.01% 10533
2025
Q2 		$4.63M Buy
19,200
+15,000
+357% +$3.55M ﹤0.01% 4245
2025
Q1 		$1.02M Buy
4,200
+2,500
+147% +$752K ﹤0.01% 6905
2024
Q4 		$558K Sell
1,700
-200
-11% -$67.9K ﹤0.01% 8312
2024
Q3 		$636K Sell
1,900
-5,300
-74% -$1.68M ﹤0.01% 7759
2024
Q2 		$1.97M Sell
7,200
-4,400
-38% -$1.28M ﹤0.01% 5343
2024
Q1 		$4.01M Sell
11,600
-8,000
-41% -$2.63M ﹤0.01% 4292
2023
Q4 		$6.33M Sell
19,600
-6,000
-23% -$1.88M ﹤0.01% 3475
2023
Q3 		$9.18M Buy
25,600
+8,500
+50% +$3.28M ﹤0.01% 2797
2023
Q2 		$6.48M Buy
17,100
+8,000
+88% +$3.26M ﹤0.01% 3265
2023
Q1 		$4.36M Sell
9,100
-36,300
-80% -$17M ﹤0.01% 4032
2022
Q4 		$19.1M Sell
45,400
-27,200
-37% -$11M ﹤0.01% 2013
2022
Q3 		$30.3M Buy
72,600
+9,100
+14% +$4.54M 0.01% 1465
2022
Q2 		$31.4M Buy
63,500
+14,800
+30% +$7.71M 0.01% 1430
2022
Q1 		$27.4M Buy
48,700
+14,300
+42% +$8.62M 0.01% 1643
2021
Q4 		$26M Buy
34,400
+16,200
+89% +$12.1M 0.01% 1739
2021
Q3 		$13.6M Sell
18,200
-36,500
-67% -$27.3M ﹤0.01% 2582
2021
Q2 		$35.2M Buy
54,700
+49,100
+877% +$29.9M 0.01% 1442
2021
Q1 		$3.2M Buy
+5,600
New +$3.32M ﹤0.01% 5283

Other funds holding BIO

First Eagle Investment Management
First Eagle Investment Management New York $59B AUM 32.99% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
AI
Ariel Investments Chicago, Illinois $8.93B AUM 29.58% 1-Year Est. Return
EARNEST Partners
EARNEST Partners Atlanta, Georgia $24.3B AUM 34.41% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return

Citadel Advisors's BIO Position: Q1 2026 in Review

Citadel Advisors increased its Bio-Rad Laboratories Class A (BIO) stake by 1,468% in Q1 2026, buying an estimated $40.1M and bringing the position to 148,669 shares worth $41.4M. The position accounts for 0.01% of the portfolio, ranked #1538.

Citadel Advisors first reported a position in BIO in Q2 2013 and has held it in 50 quarters since. The position peaked at $76.5M in Q1 2022. 392 funds tracked by Wall St. Rank hold BIO as of Q1 2026.

  • Citadel Advisors held 148,669 shares of Bio-Rad Laboratories Class A worth $41.4M as of Q1 2026.
  • Citadel Advisors bought 139,189 Bio-Rad Laboratories Class A shares in Q1 2026, an estimated $40.1M.
  • Bio-Rad Laboratories Class A made up 0.01% of Citadel Advisors's portfolio in Q1 2026, its #1538 holding.
  • Citadel Advisors first reported a position in Bio-Rad Laboratories Class A in Q2 2013 and has held it in 50 quarters since.
  • Citadel Advisors's Bio-Rad Laboratories Class A position peaked at $76.5M in Q1 2022.
  • 392 funds tracked by Wall St. Rank held Bio-Rad Laboratories Class A as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.