Illumina, Inc.
MX ˙ BMV ˙ US4523271090
SecurityMX:ILMN / Illumina, Inc.
InstitutionPrimecap Management Co/ca/
Latest Disclosed Ownership2,067,299 shares
Latest Disclosed Value $ 254,815,276
Primecap Management Co/ca/ reports 3.90% increase in ownership of ILMN / Illumina, Inc.

On May 11, 2026 - Primecap Management Co/ca/ filed a 13F-HR form disclosing ownership of 2,067,299 shares of Illumina, Inc. (MX:ILMN) valued at $254,815,276 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 1,989,679 shares of Illumina, Inc.. This represents a change in shares of 3.90% during the quarter.

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)
2026-05-11 2026-03-31 13F ILLUMINA COM 452327109 2,067,299 77,620 3.90 254,815 -2.36 0.2006
2026-02-11 2025-12-31 13F ILLUMINA COM 452327109 1,989,679 104,400 5.54 260,966 45.76 0.1975
2025-11-12 2025-09-30 13F ILLUMINA COM 452327109 1,885,279 -73,220 -3.74 179,045 -4.18 0.1371
2025-08-11 2025-06-30 13F ILLUMINA COM 452327109 1,958,499 -412,450 -17.40 186,860 -0.67 0.1481
2025-05-09 2025-03-31 13F ILLUMINA COM 452327109 2,370,949 -84,870 -3.46 188,111 -42.68 0.1555
2025-02-10 2024-12-31 13F ILLUMINA COM 452327109 2,455,819 -60,540 -2.41 328,171 0.00 0.2542
2024-11-08 2024-09-30 13F ILLUMINA COM 452327109 2,516,359 87,599 3.61 328,158 29.44 0.2413
2024-08-09 2024-06-30 13F ILLUMINA COM 452327109 2,428,760 1,997,010 462.54 253,514 327.60 0.1835
2024-05-14 2024-03-31 13F ILLUMINA COM 452327109 431,750 24,425 6.00 59,288 4.53 0.0442
2024-02-09 2023-12-31 13F ILLUMINA COM 452327109 407,325 -9,740 -2.34 56,716 -0.94 0.0449
2023-11-13 2023-09-30 13F ILLUMINA COM 452327109 417,065 -40,483 -8.85 57,255 -33.26 0.0483
2023-08-11 2023-06-30 13F ILLUMINA COM 452327109 457,548 -8,600 -1.84 85,786 -20.86 0.0717
2023-05-15 2023-03-31 13F ILLUMINA COM 452327109 466,148 -54,245 -10.42 108,403 3.02 0.0945
2023-02-13 2022-12-31 13F ILLUMINA COM 452327109 520,393 -51,310 -8.97 105,223 -3.53 0.0963
2022-11-14 2022-09-30 13F ILLUMINA COM 452327109 571,703 -33,605 -5.55 109,075 -2.26 0.1055
2022-08-11 2022-06-30 13F ILLUMINA COM 452327109 605,308 -17,030 -2.74 111,595 -48.68 0.0998
2022-05-11 2022-03-31 13F ILLUMINA COM 452327109 622,338 -42,220 -6.35 217,445 -13.99 0.1640
2022-02-11 2021-12-31 13F ILLUMINA COM 452327109 664,558 -20,160 -2.94 252,824 -8.97 0.1750
2021-11-12 2021-09-30 13F ILLUMINA COM 452327109 684,718 -28,130 -3.95 277,728 -17.67 0.1960
2021-08-10 2021-06-30 13F ILLUMINA COM 452327109 712,848 -14,635 -2.01 337,327 20.73 0.2266
2021-05-14 2021-03-31 13F ILLUMINA COM 452327109 727,483 -64,335 -8.12 279,397 -4.63 0.1948
2021-02-08 2020-12-31 13F ILLUMINA COM 452327109 791,818 -43,820 -5.24 292,973 13.43 0.2178
2020-11-13 2020-09-30 13F ILLUMINA COM 452327109 835,638 -36,060 -4.14 258,279 -20.00 0.2131
2020-08-13 2020-06-30 13F ILLUMINA COM 452327109 871,698 -55,265 -5.96 322,833 27.52 0.2770
2020-05-14 2020-03-31 13F ILLUMINA COM 452327109 926,963 -21,820 -2.30 253,172 -19.56 0.2483
2020-02-14 2019-12-31 13F ILLUMINA COM 452327109 948,783 -7,400 -0.77 314,749 8.20 0.2283
2019-11-13 2019-09-30 13F ILLUMINA COM 452327109 956,183 -24,750 -2.52 290,890 -19.45 0.2326
2019-08-14 2019-06-30 13F ILLUMINA COM 452327109 980,933 -19,560 -1.96 361,130 16.18 0.2670
2019-05-14 2019-03-31 13F ILLUMINA COM 452327109 1,000,493 -7,770 -0.77 310,843 2.79 0.2288
2019-02-12 2018-12-31 13F ILLUMINA COM 452327109 1,008,263 -61,290 -5.73 302,408 -22.97 0.2450
2018-11-13 2018-09-30 13F ILLUMINA COM 452327109 1,069,553 -57,290 -5.08 392,590 24.74 0.2650
2018-08-13 2018-06-30 13F ILLUMINA COM 452327109 1,126,843 -746,677 -39.85 314,716 -28.95 0.2333
2018-05-14 2018-03-31 13F ILLUMINA COM 452327109 1,873,520 -13,840 -0.73 442,938 7.41 0.3324
2018-02-13 2017-12-31 13F ILLUMINA COM 452327109 1,887,360 -15,870 -0.83 412,369 8.77 0.3165
2017-11-13 2017-09-30 13F ILLUMINA COM 452327109 1,903,230 -132,190 -6.49 379,123 7.34 0.3138
2017-08-11 2017-06-30 13F ILLUMINA COM 452327109 2,035,420 -36,690 -1.77 353,186 -0.11 0.3034
2017-05-12 2017-03-31 13F ILLUMINA COM 452327109 2,072,110 -7,620 -0.37 353,585 32.78 0.3209
2017-02-13 2016-12-31 13F ILLUMINA COM 452327109 2,079,730 -3,440 -0.17 266,289 -29.63 0.2620
2016-11-14 2016-09-30 13F ILLUMINA COM 452327109 2,083,170 -56,750 -2.65 378,429 25.97 0.3777
2016-08-12 2016-06-30 13F ILLUMINA COM 452327109 2,139,920 -34,850 -1.60 300,402 -14.79 0.3199
2016-05-12 2016-03-31 13F ILLUMINA COM 452327109 2,174,770 590 0.03 352,552 -15.52 0.3657
2016-02-12 2015-12-31 13F ILLUMINA COM 452327109 2,174,180 -3,860 -0.18 417,323 8.98 0.4267
2015-11-12 2015-09-30 13F ILLUMINA COM 452327109 2,178,040 -61,357 -2.74 382,943 -21.69 0.4251
2015-08-13 2015-06-30 13F ILLUMINA COM 452327109 2,239,397 -2,590 -0.12 488,995 17.49 0.4810
2015-05-14 2015-03-31 13F ILLUMINA COM 452327109 2,241,987 140 0.01 416,202 0.58 0.4064
2015-02-12 2014-12-31 13F ILLUMINA COM 452327109 2,241,847 -2,990 -0.13 413,800 12.45 0.4193
2014-11-13 2014-09-30 13F ILLUMINA COM 452327109 2,244,837 -7,943 -0.35 367,974 -8.51 0.3937
2014-08-14 2014-06-30 13F ILLUMINA COM 452327109 2,252,780 -9,490 -0.42 402,211 19.60 0.4404
2014-05-14 2014-03-31 13F ILLUMINA COM 452327109 2,262,270 214,207 10.46 336,309 48.48 0.3806
2014-02-13 2013-12-31 13F ILLUMINA COM 452327109 2,048,063 12,400 0.61 226,495 37.65 0.2722
2013-11-13 2013-09-30 13F ILLUMINA COM 452327109 2,035,663 7,463 0.37 164,543 8.40 0.2165
2013-08-14 2013-06-30 13F ILLUMINA COM 452327109 2,028,200 2,028,200 151,790 0.2171
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.