Gilead Sciences, Inc.
CH ˙ SWX ˙ US3755581036
SecurityCH:GILD / Gilead Sciences, Inc.
InstitutionCastleark Management Llc
Latest Disclosed Ownership342,150 shares
Latest Disclosed Value $ 47,685,446
Castleark Management Llc reports 23.37% increase in ownership of GILD / Gilead Sciences, Inc.

On May 15, 2026 - Castleark Management Llc filed a 13F-HR form disclosing ownership of 342,150 shares of Gilead Sciences, Inc. (CH:GILD) valued at $47,685,446 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 277,328 shares of Gilead Sciences, Inc.. This represents a change in shares of 23.37% 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)
2026-05-15 2026-03-31 13F GILEAD SCIENCES COM 375558103 342,150 64,822 23.37 47,685 40.09 1.5778
2026-02-12 2025-12-31 13F GILEAD SCIENCES COM 375558103 277,328 136,296 96.64 34,039 117.45 0.9993
2025-11-17 2025-09-30 13F GILEAD SCIENCES COM 375558103 141,032 135,700 2,545.01 15,655 2,548.73 0.4389
2025-08-18 2025-06-30 13F GILEAD SCIENCES COM 375558103 5,332 0 0.00 591 -1.01 0.0178
2025-05-15 2025-03-31 13F GILEAD SCIENCES COM 375558103 5,332 0 0.00 597 21.34 0.0207
2025-02-18 2024-12-31 13F GILEAD SCIENCES COM 375558103 5,332 0 0.00 493 10.07 0.0172
2024-11-15 2024-09-30 13F GILEAD SCIENCES COM 375558103 5,332 0 0.00 447 22.47 0.0182
2024-08-14 2024-06-30 13F GILEAD SCIENCES COM 375558103 5,332 0 0.00 366 -6.41 0.0149
2024-05-16 2024-03-31 13F GILEAD SCIENCES COM 375558103 5,332 0 0.00 391 -9.51 0.0162
2024-02-15 2023-12-31 13F GILEAD SCIENCES COM 375558103 5,332 0 0.00 432 8.02 0.0191
2023-11-15 2023-09-30 13F GILEAD SCIENCES COM 375558103 5,332 0 0.00 400 -2.68 0.0204
2023-08-16 2023-06-30 13F GILEAD SCIENCES COM 375558103 5,332 0 0.00 411 -7.24 0.0186
2023-05-16 2023-03-31 13F GILEAD SCIENCES COM 375558103 5,332 0 0.00 442 -3.28 0.0217
2023-02-10 2022-12-31 13F GILEAD SCIENCES COM 375558103 5,332 0 0.00 458 38.91 0.0239
2022-11-15 2022-09-30 13F GILEAD SCIENCES COM 375558103 5,332 0 0.00 329 -0.30 0.0183
2022-08-16 2022-06-30 13F GILEAD SCIENCES COM 375558103 5,332 -3,518 -39.75 330 -37.26 0.0177
2022-05-16 2022-03-31 13F GILEAD SCIENCES COM 375558103 8,850 0 0.00 526 -18.20 0.0227
2022-02-16 2021-12-31 13F GILEAD SCIENCES COM 375558103 8,850 0 0.00 643 4.05 0.0236
2021-11-12 2021-09-30 13F GILEAD SCIENCES COM 375558103 8,850 0 0.00 618 1.48 0.0236
2021-08-17 2021-06-30 13F GILEAD SCIENCES COM 375558103 8,850 0 0.00 609 6.47 0.0205
2021-05-14 2021-03-31 13F GILEAD SCIENCES COM 375558103 8,850 0 0.00 572 10.85 0.0206
2021-02-17 2020-12-31 13F GILEAD SCIENCES COM 375558103 8,850 0 0.00 516 -7.69 0.0193
2020-11-16 2020-09-30 13F GILEAD SCIENCES COM 375558103 8,850 0 0.00 559 -17.91 0.0219
2020-08-14 2020-06-30 13F GILEAD SCIENCES COM 375558103 8,850 0 0.00 681 2.87 0.0296
2020-05-13 2020-03-31 13F GILEAD SCIENCES COM 375558103 8,850 0 0.00 662 15.13 0.0392
2020-02-14 2019-12-31 13F GILEAD SCIENCES COM 375558103 8,850 0 0.00 575 2.50 0.0230
2019-11-15 2019-09-30 13F GILEAD SCIENCES COM 375558103 8,850 0 0.00 561 -6.19 0.0229
2019-08-13 2019-06-30 13F GILEAD SCIENCES COM 375558103 8,850 0 0.00 598 4.00 0.0229
2019-05-14 2019-03-31 13F GILEAD SCIENCES COM 375558103 8,850 -89,018 -90.96 575 -90.61 0.0216
2019-02-12 2018-12-31 13F GILEAD SCIENCES COM 375558103 97,868 -7,640 -7.24 6,122 -24.85 0.2609
2018-11-14 2018-09-30 13F GILEAD SCIENCES COM 375558103 105,508 -1,000 -0.94 8,146 7.97 0.2341
2018-08-15 2018-06-30 13F GILEAD SCIENCES COM 375558103 106,508 -1,240 -1.15 7,545 -7.12 0.2322
2018-05-14 2018-03-31 13F GILEAD SCIENCES COM 375558103 107,748 -5,330 -4.71 8,123 0.27 0.2572
2018-02-15 2017-12-31 13F GILEAD SCIENCES COM 375558103 113,078 -5,740 -4.83 8,101 -15.85 0.2432
2017-11-15 2017-09-30 13F GILEAD SCIENCES COM 375558103 118,818 109,968 1,242.58 9,627 1,437.86 0.3022
2017-08-15 2017-06-30 13F GILEAD SCIENCES COM 375558103 8,850 -6,400 -41.97 626 -39.58 0.0205
2017-05-15 2017-03-31 13F GILEAD SCIENCES COM 375558103 15,250 -2,400 -13.60 1,036 -18.04 0.0325
2017-02-15 2016-12-31 13F GILEAD SCIENCES COM 375558103 17,650 -213,350 -92.36 1,264 -93.08 0.0403
2016-11-15 2016-09-30 13F GILEAD SCIENCES COM 375558103 231,000 -81,130 -25.99 18,277 -29.81 0.5528
2016-08-10 2016-06-30 13F GILEAD SCIENCES COM 375558103 312,130 -24,780 -7.36 26,038 -15.87 0.8305
2016-05-17 2016-03-31 13F GILEAD SCIENCES COM 375558103 336,910 -36,160 -9.69 30,949 -18.02 0.9665
2016-02-17 2015-12-31 13F GILEAD SCIENCES COM 375558103 373,070 -143,300 -27.75 37,751 -25.54 1.1345
2015-11-17 2015-09-30 13F GILEAD SCIENCES COM 375558103 516,370 -20,400 -3.80 50,702 -19.32 1.6316
2015-08-17 2015-06-30 13F GILEAD SCIENCES COM 375558103 536,770 -122,730 -18.61 62,845 -2.89 1.6788
2015-05-15 2015-03-31 13F GILEAD SCIENCES COM 375558103 659,500 -97,220 -12.85 64,717 -9.27 1.5607
2015-02-10 2014-12-31 13F GILEAD SCIENCES COM 375558103 756,720 -169,250 -18.28 71,328 8.71 1.8378
2014-11-17 2014-09-30 13F GILEAD SCIENCES COM 375558103 925,970 500,410 117.59 65,614 85.96 1.8657
2014-08-15 2014-06-30 13F GILEAD SCIENCES COM 375558103 425,560 -500,410 -54.04 35,283 -46.23 0.9724
2014-05-20 2014-03-31 13F GILEAD SCIENCES COM 375558103 925,970 -480,811 -34.18 65,614 -37.89 1.8657
2014-02-20 2013-12-31 13F GILEAD SCIENCES COM 375558103 1,406,781 1,153,631 455.71 105,649 292.05 3.0667
2014-11-21 2013-09-30 13F/A-1 GILEAD SCIENCES COM 375558103 253,150 -887,850 -77.81 26,948 -53.93 0.7598
2013-11-20 2013-09-30 13F GILEAD SCIENCES COM 375558103 1,252,500 78,745
2013-09-26 2013-06-30 13F GILEAD SCIENCES COM 375558103 1,141,000 1,141,000 58,499 1.9407
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.