Cytek Biosciences, Inc.
DE ˙ DB ˙ US23285D1090
3,46 € ↓ -0,08 (-2,26%)
2026-06-04
DEL PRIS
SecurityDE:8EQ / Cytek Biosciences, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership254,589 shares
Latest Disclosed Value $ 1,112,539
Rhumbline Advisers reports 1.86% increase in ownership of 8EQ / Cytek Biosciences, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 254,589 shares of Cytek Biosciences, Inc. (DE:8EQ) valued at $941,979 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 249,940 shares of Cytek Biosciences, Inc.. This represents a change in shares of 1.86% during the quarter. The current value of the position is $880,878 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-12 2026-03-31 13F CYTEK BIOSCIENCES COM 23285D109 254,589 4,649 1.86 1,113 -11.89 0.0010
2026-02-13 2025-12-31 13F CYTEK BIOSCIENCES COM 23285D109 249,940 -30,427 -10.85 1,262 29.84 0.0010
2025-11-06 2025-09-30 13F CYTEK BIOSCIENCES COM 23285D109 280,367 -2,284 -0.81 973 1.14 0.0008
2025-08-12 2025-06-30 13F CYTEK BIOSCIENCES COM 23285D109 282,651 -13,633 -4.60 961 -19.11 0.0008
2025-05-29 2025-03-31 13F/A-1 CYTEK BIOSCIENCES COM 23285D109 296,284 1,745 0.59 1,188 -37.83 0.0011
2025-04-08 2025-03-31 13F CYTEK BIOSCIENCES COM 23285D109 296,284 1,745 1,188 0.0011
2025-05-29 2024-12-31 13F/A-1 CYTEK BIOSCIENCES COM 23285D109 294,539 14 0.00 1,912 17.17 0.0017
2025-01-30 2024-12-31 13F CYTEK BIOSCIENCES COM 23285D109 294,539 14 1,912 0.0017
2024-11-12 2024-09-30 13F CYTEK BIOSCIENCES COM 23285D109 294,525 -60,911 -17.14 1,632 -17.75 0.0015
2024-08-01 2024-06-30 13F CYTEK BIOSCIENCES COM 23285D109 355,436 18,124 5.37 1,983 -12.37 0.0019
2024-05-09 2024-03-31 13F CYTEK BIOSCIENCES COM 23285D109 337,312 9,682 2.96 2,263 -24.24 0.0022
2024-02-08 2023-12-31 13F CYTEK BIOSCIENCES COM 23285D109 327,630 5,638 1.75 2,988 68.09 0.0031
2023-11-09 2023-09-30 13F CYTEK BIOSCIENCES COM 23285D109 321,992 31,570 10.87 1,777 -28.35 0.0021
2023-08-08 2023-06-30 13F CYTEK BIOSCIENCES COM 23285D109 290,422 141,055 94.44 2,480 247,900.00 0.0028
2023-05-11 2023-03-31 13F CYTEK BIOSCIENCES COM 23285D109 149,367 6,804 4.77 1 -99.93 0.0017
2023-02-14 2022-12-31 13F CYTEK BIOSCIENCES COM 23285D109 142,563 1,845 1.31 1,456 -29.70 0.0020
2022-11-10 2022-09-30 13F CYTEK BIOSCIENCES COM 23285D109 140,718 11,751 9.11 2,071 49.64 0.0031
2022-08-11 2022-06-30 13F CYTEK BIOSCIENCES COM 23285D109 128,967 32,689 33.95 1,384 33.33 0.0020
2022-05-12 2022-03-31 13F CYTEK BIOSCIENCES COM 23285D109 96,278 81,455 549.52 1,038 328.93 0.0013
2022-02-10 2021-12-31 13F CYTEK BIOSCIENCES COM 23285D109 14,823 3,062 26.04 242 -3.97 0.0003
2021-11-12 2021-09-30 13F CYTEK BIOSCIENCES COM 23285D109 11,761 11,761 252 0.0003
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.