Citadel Advisors
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Citadel Advisors’s Cytek Biosciences CTKB Stock Holding History

Citadel Advisors’s Portfolio CTKB Stock Details CTKB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$3.2M Buy
721,470
+250,078
+53% +$1.07M ﹤0.01% 5588
2026
Q1 		$2.06M Buy
471,392
+304,638
+183% +$1.44M ﹤0.01% 6008
2025
Q4 		$842K Buy
166,754
+84,450
+103% +$392K ﹤0.01% 7794
2025
Q3 		$286K Sell
82,304
-534,781
-87% -$2.01M ﹤0.01% 10490
2025
Q2 		$2.1M Buy
617,085
+14,568
+2% +$48.5K ﹤0.01% 5621
2025
Q1 		$2.42M Buy
602,517
+401,377
+200% +$2.08M ﹤0.01% 5164
2024
Q4 		$1.31M Sell
201,140
-69,432
-26% -$414K ﹤0.01% 6497
2024
Q3 		$1.5M Buy
270,572
+213,444
+374% +$1.21M ﹤0.01% 6057
2024
Q2 		$319K Buy
+57,128
New +$343K ﹤0.01% 9017
2023
Q4 		– Sell
-404
Closed -$2.23K – 14377
2023
Q3 		$2.23K Sell
404
-755
-65% -$6.06K ﹤0.01% 13745
2023
Q2 		$9.9K Sell
1,159
-391,733
-100% -$3.51M ﹤0.01% 13233
2023
Q1 		$3.61M Buy
392,892
+343,750
+700% +$3.7M ﹤0.01% 4350
2022
Q4 		$502K Buy
+49,142
New +$660K ﹤0.01% 8225
2022
Q3 		– Sell
-264,928
Closed -$3.44M – 12753
2022
Q2 		$2.84M Buy
264,928
+239,579
+945% +$2.38M ﹤0.01% 4852
2022
Q1 		$273K Sell
25,349
-67,020
-73% -$905K ﹤0.01% 10795
2021
Q4 		$1.51M Buy
92,369
+77,051
+503% +$1.61M ﹤0.01% 6872
2021
Q3 		$328K Buy
+15,318
New +$360K ﹤0.01% 10871

Other funds holding CTKB

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return
HA
HHLR Advisors Grand Cayman, Cayman Islands $832M AUM 32.38% 1-Year Est. Return
TCM
Topline Capital Management Santa Monica, California $386M AUM 2.37% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return

Citadel Advisors's CTKB Position: Q2 2026 in Review

Citadel Advisors increased its Cytek Biosciences (CTKB) stake by 53% in Q2 2026, buying an estimated $1.07M and bringing the position to 721,470 shares worth $3.2M. The position accounts for ﹤0.01% of the portfolio, ranked #5588.

Citadel Advisors first reported a position in CTKB in Q3 2021 and has held it in 17 quarters since. The position peaked at $3.61M in Q1 2023. 155 funds tracked by Wall St. Rank hold CTKB as of Q2 2026.

  • Citadel Advisors held 721,470 shares of Cytek Biosciences worth $3.2M as of Q2 2026.
  • Citadel Advisors bought 250,078 Cytek Biosciences shares in Q2 2026, an estimated $1.07M.
  • Cytek Biosciences made up ﹤0.01% of Citadel Advisors's portfolio in Q2 2026, its #5588 holding.
  • Citadel Advisors first reported a position in Cytek Biosciences in Q3 2021 and has held it in 17 quarters since.
  • Citadel Advisors's Cytek Biosciences position peaked at $3.61M in Q1 2023.
  • 155 funds tracked by Wall St. Rank held Cytek Biosciences as of Q2 2026.

Based on Citadel Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.