Illumina, Inc.
US ˙ NasdaqGS ˙ US4523271090

SecurityILMN / Illumina, Inc.
InstitutionBrown Advisory Inc
Latest Disclosed Ownership592,376 shares
Latest Disclosed Value $ 73,016,206
Brown Advisory Inc reports 0.54% increase in ownership of ILMN / Illumina, Inc.

On May 15, 2026 - Brown Advisory Inc filed a 13F-HR form disclosing ownership of 592,376 shares of Illumina, Inc. (US:ILMN) valued at $73,016,266 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 589,173 shares of Illumina, Inc.. This represents a change in shares of 0.54% during the quarter. The current value of the position is $101,254,830 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 ILLUMINA COM 452327109 592,376 3,203 0.54 73,016 -5.51 0.0535
2026-02-13 2025-12-31 13F ILLUMINA COM 452327109 589,173 -28,210 -4.57 77,276 31.80 0.1078
2025-11-14 2025-09-30 13F ILLUMINA COM 452327109 617,383 -108,604 -14.96 58,633 -15.35 0.0763
2025-08-13 2025-06-30 13F ILLUMINA COM 452327109 725,987 -2,183,241 -75.05 69,266 -69.99 0.0912
2025-04-30 2025-03-31 13F ILLUMINA COM 452327109 2,909,228 996,589 52.11 230,818 -9.69 0.3299
2025-02-14 2024-12-31 13F ILLUMINA COM 452327109 1,912,639 1,909,118 54,220.90 255,586 55,583.01 0.3242
2024-11-13 2024-09-30 13F ILLUMINA COM 452327109 3,521 -174 -4.71 459 19.22 0.0006
2024-08-14 2024-06-30 13F ILLUMINA COM 452327109 3,695 1,107 42.77 386 8.45 0.0005
2024-04-24 2024-03-31 13F ILLUMINA COM 452327109 2,588 -110 -4.08 355 -5.33 0.0005
2024-02-08 2023-12-31 13F ILLUMINA COM 452327109 2,698 -1,442 -34.83 376 -33.98 0.0005
2023-10-25 2023-09-30 13F ILLUMINA COM 452327109 4,140 176 4.44 568 -23.55 0.0009
2023-07-31 2023-06-30 13F ILLUMINA COM 452327109 3,964 -766 -16.19 743 -32.39 0.0012
2023-05-08 2023-03-31 13F ILLUMINA COM 452327109 4,730 659 16.19 1,100 33.54 0.0019
2023-02-13 2022-12-31 13F ILLUMINA COM 452327109 4,071 -710 -14.85 823 -9.86 0.0015
2022-11-14 2022-09-30 13F ILLUMINA COM 452327109 4,781 -6,475 -57.52 913 -56.00 0.0018
2022-11-14 2022-06-30 13F/A-2 ILLUMINA COM 452327109 11,256 -9,364 -45.41 2,075 -71.20 0.0039
2022-09-13 2022-06-30 13F/A-1 ILLUMINA COM 452327109 10,416 -10,647 1,920 0.0033
2022-08-02 2022-06-30 13F ILLUMINA COM 452327109 13,818 -7,409 3,215 0.0021
2022-11-14 2022-03-31 13F/A-2 ILLUMINA COM 452327109 20,620 -572 -2.70 7,205 -10.64 0.0107
2022-09-13 2022-03-31 13F/A-1 ILLUMINA COM 452327109 21,063 -129 7,360 0.0103
2022-05-09 2022-03-31 13F ILLUMINA COM 452327109 21,227 35 7,523 0.0102
2022-01-27 2021-12-31 13F ILLUMINA COM 452327109 21,192 377 1.81 8,063 -4.50 0.0100
2021-11-12 2021-09-30 13F ILLUMINA COM 452327109 20,815 -585 -2.73 8,443 -16.63 0.0125
2021-07-29 2021-06-30 13F ILLUMINA COM 452327109 21,400 1,243 6.17 10,127 30.81 0.0153
2021-05-14 2021-03-31 13F ILLUMINA COM 452327109 20,157 -18,240 -47.50 7,742 -45.51 0.0132
2021-02-12 2020-12-31 13F ILLUMINA COM 452327109 38,397 -6,123 -13.75 14,207 3.24 0.0252
2020-11-16 2020-09-30 13F ILLUMINA COM 452327109 44,520 -1,569,427 -97.24 13,761 -97.70 0.0284
2020-08-14 2020-06-30 13F ILLUMINA COM 452327109 1,613,947 31,060 1.96 597,726 38.26 1.3924
2020-05-15 2020-03-31 13F ILLUMINA COM 452327109 1,582,887 89,132 5.97 432,318 -12.76 1.3245
2020-02-14 2019-12-31 13F ILLUMINA COM 452327109 1,493,755 315,436 26.77 495,539 38.24 1.2571
2019-11-14 2019-09-30 13F ILLUMINA COM 452327109 1,178,319 962,848 446.86 358,469 351.89 1.0059
2019-08-12 2019-06-30 13F ILLUMINA COM 452327109 215,471 14,782 7.37 79,326 27.20 0.2270
2019-05-15 2019-03-31 13F ILLUMINA COM 452327109 200,689 76,440 61.52 62,363 67.35 0.1769
2019-02-13 2018-12-31 13F ILLUMINA COM 452327109 124,249 106,464 598.62 37,265 470.85 0.1252
2018-11-13 2018-09-30 13F ILLUMINA COM 452327109 17,785 -433 -2.38 6,528 28.30 0.0186
2018-08-10 2018-06-30 13F ILLUMINA COM 452327109 18,218 477 2.69 5,088 21.29 0.0157
2018-06-28 2018-03-31 13F/A-1 ILLUMINA COM 452327109 17,741 -2,201 -11.04 4,195 -3.74 0.0136
2018-05-14 2018-03-31 13F ILLUMINA COM 452327109 10,755 -9,187 2,543
2018-02-12 2017-12-31 13F ILLUMINA COM 452327109 19,942 498 2.56 4,358 12.49 0.0138
2017-11-13 2017-09-30 13F ILLUMINA COM 452327109 19,444 -1,052 -5.13 3,874 8.91 0.0128
2017-08-14 2017-06-30 13F ILLUMINA COM 452327109 20,496 -286 -1.38 3,557 0.28 0.0109
2017-05-15 2017-03-31 13F ILLUMINA COM 452327109 20,782 -125 -0.60 3,547 32.55 0.0121
2017-02-13 2016-12-31 13F ILLUMINA COM 452327109 20,907 4,222 25.30 2,676 -11.71 0.0096
2016-11-14 2016-09-30 13F ILLUMINA COM 452327109 16,685 -1,887 -10.16 3,031 16.26 0.0104
2016-08-09 2016-06-30 13F ILLUMINA COM 452327109 18,572 9,412 102.75 2,607 75.56 0.0092
2016-05-13 2016-03-31 13F ILLUMINA COM 452327109 9,160 3,801 70.93 1,485 44.31 0.0051
2016-02-08 2015-12-31 13F ILLUMINA COM 452327109 5,359 2,568 92.01 1,029 109.57 0.0035
2015-11-13 2015-09-30 13F ILLUMINA COM 452327109 2,791 1,056 60.86 491 29.55 0.0018
2015-08-11 2015-06-30 13F ILLUMINA COM 452327109 1,735 -680 -28.16 379 -15.40 0.0012
2015-05-14 2015-03-31 13F ILLUMINA COM 452327109 2,415 -3,045 -55.77 448 -55.56 0.0014
2015-02-13 2014-12-31 13F/A-1 ILLUMINA COM 452327109 5,460 152 2.86 1,008 15.86 0.0032
2015-02-09 2014-12-31 13F ILLUMINA COM 452327109 5,460 1,008
2014-11-10 2014-09-30 13F ILLUMINA COM 452327109 5,308 68 1.30 870 -7.05 0.0028
2014-08-08 2014-06-30 13F ILLUMINA COM 452327109 5,240 -3 -0.06 936 20.15 0.0029
2014-05-13 2014-03-31 13F ILLUMINA COM 452327109 5,243 -5,707 -52.12 779 -35.67 0.0025
2014-02-11 2013-12-31 13F ILLUMINA COM 452327109 10,950 10,950 217.39 1,211 367.57 0.0039
2013-11-08 2013-09-30 13F ILLUMINA COM 452327109 0 -3,450 -100.00 0 -100.00
2013-08-13 2013-06-30 13F ILLUMINA COM 452327109 3,450 3,450 259 0.0010
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.