Illumina, Inc.
US ˙ NasdaqGS ˙ US4523271090

SecurityILMN / Illumina, Inc.
InstitutionMarex Group plc
Latest Disclosed Ownership6,655 shares
Latest Disclosed Value $ 820,295
Marex Group plc reports 34.04% increase in ownership of ILMN / Illumina, Inc.

On May 13, 2026 - Marex Group plc filed a 13F-HR form disclosing ownership of 6,655 shares of Illumina, Inc. (US:ILMN) valued at $820,295 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 4,965 shares of Illumina, Inc.. This represents a change in shares of 34.04% during the quarter. The current value of the position is $1,080,240 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)
2026-05-13 2026-03-31 13F ILLUMINA COM 452327109 6,655 1,690 34.04 820 25.96 0.0034
2026-02-12 2025-12-31 13F ILLUMINA COM 452327109 4,965 -9,454 -65.57 651 -52.45 0.0041
2025-11-14 2025-09-30 13F ILLUMINA COM 452327109 14,419 1,429 11.00 1,369 10.49 0.0097
2025-08-19 2025-06-30 13F ILLUMINA COM 452327109 12,990 -3,664 -22.00 1,239 -6.21 0.0107
2026-04-02 2025-03-31 13F ILLUMINA COM 452327109 16,654 12,364 288.21 1,321 130.54 0.0253
2026-04-02 2024-12-31 13F ILLUMINA COM 452327109 4,290 -1,139 -20.98 573 -18.95 0.0098
2026-04-07 2024-09-30 13F ILLUMINA COM 452327109 5,429 -3,338 -38.07 708 -22.73 0.0161
2026-04-02 2024-06-30 13F ILLUMINA COM 452327109 8,767 2,798 46.88 915 11.72 0.0246
2026-04-02 2024-03-31 13F ILLUMINA COM 452327109 5,969 -3,636 -37.86 820 -38.74 0.0266
2026-04-02 2023-12-31 13F ILLUMINA COM 452327109 9,605 3,416 55.19 1,337 57.48 0.0526
2026-04-02 2023-09-30 13F ILLUMINA COM 452327109 6,189 1,891 44.00 850 5.47 0.1201
2026-04-02 2023-06-30 13F ILLUMINA COM 452327109 4,298 1,988 86.06 806 49.91 0.1453
2026-04-02 2023-03-31 13F ILLUMINA COM 452327109 2,310 219 10.47 537 27.25 0.0711
2026-04-02 2022-12-31 13F ILLUMINA COM 452327109 2,091 2,091 423 0.0601
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.