Cytek Biosciences, Inc.
US ˙ NasdaqGS ˙ US23285D1090

SecurityCTKB / Cytek Biosciences, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership1,718,875 shares
Latest Disclosed Value $ 7,511,483
Morgan Stanley reports 1.05% increase in ownership of CTKB / Cytek Biosciences, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 1,718,875 shares of Cytek Biosciences, Inc. (US:CTKB) valued at $7,511,484 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 1,700,985 shares of Cytek Biosciences, Inc.. This represents a change in shares of 1.05% during the quarter. The current value of the position is $7,442,729 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)
2026-05-15 2026-03-31 13F CYTEK BIOSCIENCES COM 23285D109 1,718,875 17,890 1.05 7,511 -12.55 0.0005
2026-05-27 2025-12-31 13F/A-1 CYTEK BIOSCIENCES COM 23285D109 1,700,985 237,844 16.26 8,590 69.17 0.0005
2026-02-13 2025-12-31 13F CYTEK BIOSCIENCES COM 23285D109 1,700,985 237,844 8,590 0.0005
2026-05-27 2025-09-30 13F/A-1 CYTEK BIOSCIENCES COM 23285D109 1,463,141 313,020 27.22 5,077 29.85 0.0003
2025-11-14 2025-09-30 13F CYTEK BIOSCIENCES COM 23285D109 1,463,141 313,020 5,077 0.0003
2025-08-15 2025-06-30 13F CYTEK BIOSCIENCES COM 23285D109 1,150,121 404,644 54.28 3,910 30.81 0.0003
2025-05-15 2025-03-31 13F CYTEK BIOSCIENCES COM 23285D109 745,477 -343,984 -31.57 2,989 -57.72 0.0002
2025-05-15 2024-12-31 13F/A-1 CYTEK BIOSCIENCES COM 23285D109 1,089,461 22,403 2.10 7,071 19.61 0.0005
2025-02-14 2024-12-31 13F CYTEK BIOSCIENCES COM 23285D109 1,089,461 22,403 7,071 0.0005
2025-05-14 2024-09-30 13F/A-2 CYTEK BIOSCIENCES COM 23285D109 1,067,058 172,694 19.31 5,912 18.46 0.0004
2025-02-14 2024-09-30 13F/A-1 CYTEK BIOSCIENCES COM 23285D109 1,067,058 172,694 5,912 0.0004
2024-11-14 2024-09-30 13F CYTEK BIOSCIENCES COM 23285D109 1,067,058 172,694 5,912 0.0001
2025-05-14 2024-06-30 13F/A-2 CYTEK BIOSCIENCES COM 23285D109 894,364 50,843 6.03 4,991 -11.84 0.0004
2024-10-17 2024-06-30 13F/A-1 CYTEK BIOSCIENCES COM 23285D109 894,364 50,843 4,991 0.0004
2024-08-14 2024-06-30 13F CYTEK BIOSCIENCES COM 23285D109 894,364 50,843 4,991 0.0004
2024-10-17 2024-03-31 13F/A-2 CYTEK BIOSCIENCES COM 23285D109 843,521 7,365 0.88 5,660 -25.77 0.0005
2024-08-16 2024-03-31 13F/A-1 CYTEK BIOSCIENCES COM 23285D109 843,521 7,365 5,660 0.0001
2024-05-15 2024-03-31 13F CYTEK BIOSCIENCES COM 23285D109 843,521 7,365 5,660 0.0005
2024-08-16 2023-12-31 13F/A-1 CYTEK BIOSCIENCES COM 23285D109 836,156 221,863 36.12 7,626 124.93 0.0007
2024-02-13 2023-12-31 13F CYTEK BIOSCIENCES COM 23285D109 836,156 221,863 7,626 0.0007
2023-11-15 2023-09-30 13F CYTEK BIOSCIENCES COM 23285D109 614,293 43,997 7.71 3,391 -30.39 0.0003
2023-08-14 2023-06-30 13F CYTEK BIOSCIENCES COM 23285D109 570,296 53,332 10.32 4,870 2.53 0.0005
2023-05-15 2023-03-31 13F CYTEK BIOSCIENCES COM 23285D109 516,964 327,379 172.68 4,751 145.48 0.0005
2023-02-14 2022-12-31 13F CYTEK BIOSCIENCES COM 23285D109 189,585 -25,457 -11.84 1,936 -38.86 0.0002
2022-11-14 2022-09-30 13F CYTEK BIOSCIENCES COM 23285D109 215,042 18,399 9.36 3,165 50.00 0.0004
2022-10-27 2022-06-30 13F/A-1 CYTEK BIOSCIENCES COM 23285D109 196,643 78,756 66.81 2,110 66.01 0.0003
2022-08-15 2022-06-30 13F CYTEK BIOSCIENCES COM 23285D109 196,643 78,756 2,110 0.0003
2022-10-27 2022-03-31 13F/A-1 CYTEK BIOSCIENCES COM 23285D109 117,887 112,808 2,221.07 1,271 1,450.00 0.0002
2022-05-13 2022-03-31 13F CYTEK BIOSCIENCES COM 23285D109 117,887 112,808 1,271 0.0002
2022-02-14 2021-12-31 13F CYTEK BIOSCIENCES COM 23285D109 5,079 -35,836 -87.59 82 -90.63 0.0000
2021-11-15 2021-09-30 13F CYTEK BIOSCIENCES COM 23285D109 40,915 40,915 875 0.0001
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.