Amgen Inc.
MX ˙ BMV ˙ NL0000888691
SecurityMX:AMGN / Amgen Inc.
InstitutionRathbone Brothers plc
Latest Disclosed Ownership15,165 shares
Latest Disclosed Value $ 5,335,805
Rathbone Brothers plc reports 13.43% increase in ownership of AMGN / Amgen Inc.

On May 12, 2026 - Rathbone Brothers plc filed a 13F-HR form disclosing ownership of 15,165 shares of Amgen Inc. (MX:AMGN) valued at $5,335,805 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 6, 2026 disclosing 13,369 shares of Amgen Inc.. This represents a change in shares of 13.43% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-12 2026-03-31 13F AMGEN INC USD0.0001 COM 031162100 15,165 1,796 13.43 5,336 21.94 0.0228
2026-02-06 2025-12-31 13F/A-1 AMGEN INC USD0.0001 COM 031162100 13,369 240 1.83 4,376 18.08 0.0173
2026-01-21 2025-12-31 13F AMGEN INC USD0.0001 COM 031162100 13,369 240 4,376 0.0173
2025-11-13 2025-09-30 13F AMGEN INC USD0.0001 COM 031162100 13,129 193 1.49 3,705 2.60 0.0150
2025-08-07 2025-06-30 13F AMGEN INC USD0.0001 COM 031162100 12,936 -23 -0.18 3,612 -10.55 0.0156
2025-05-13 2025-03-31 13F AMGEN INC USD0.0001 COM 031162100 12,959 1,285 11.01 4,037 32.71 0.0195
2025-02-13 2024-12-31 13F AMGEN INC USD0.0001 COM 031162100 11,674 -192 -1.62 3,043 -20.43 0.0147
2024-11-13 2024-09-30 13F AMGEN INC USD0.0001 COM 031162100 11,866 92 0.78 3,823 3.94 0.0193
2024-08-09 2024-06-30 13F AMGEN INC USD0.0001 COM 031162100 11,774 2,054 21.13 3,679 33.12 0.0200
2024-05-14 2024-03-31 13F AMGEN INC USD0.0001 COM 031162100 9,720 608 6.67 2,764 5.30 0.0159
2024-02-13 2023-12-31 13F AMGEN INC USD0.0001 COM 031162100 9,112 184 2.06 2,624 9.38 0.0169
2023-11-13 2023-09-30 13F AMGEN INC USD0.0001 COM 031162100 8,928 802 9.87 2,399 32.98 0.0174
2023-08-04 2023-06-30 13F AMGEN INC USD0.0001 COM 031162100 8,126 -35,000 -81.16 1,804 -82.70 0.0168
2023-05-12 2023-03-31 13F AMGEN INC USD0.0001 COM 031162100 43,126 -4,300 -9.07 10,426 -16.30 0.1066
2023-02-14 2022-12-31 13F AMGEN INC USD0.0001 COM 031162100 47,426 -46,151 -49.32 12,456 -40.95 0.1402
2022-11-14 2022-09-30 13F/A-1 AMGEN INC USD0.0001 COM 031162100 93,577 -29,122 -23.73 21,092 -29.35 0.2602
2022-11-03 2022-09-30 13F AMGEN INC USD0.0001 COM 031162100 93,577 -29,122 21,092 0.2602
2022-08-12 2022-06-30 13F AMGEN INC USD0.0001 COM 031162100 122,699 -1,100 -0.89 29,853 -0.28 0.3422
2022-05-11 2022-03-31 13F AMGEN INC USD0.0001 COM 031162100 123,799 4,665 3.92 29,937 11.70 0.3054
2022-02-10 2021-12-31 13F AMGEN INC USD0.0001 COM 031162100 119,134 3,800 3.29 26,802 9.28 0.2605
2021-11-04 2021-09-30 13F AMGEN INC USD0.0001 COM 031162100 115,334 1,296 1.14 24,526 -11.77 0.2639
2021-07-30 2021-06-30 13F AMGEN INC USD0.0001 COM 031162100 114,038 14,055 14.06 27,797 11.74 0.3088
2021-05-14 2021-03-31 13F AMGEN INC USD0.0001 COM 031162100 99,983 4,307 4.50 24,877 13.09 0.3186
2021-02-11 2020-12-31 13F AMGEN INC USD0.0001 COM 031162100 95,676 9,121 10.54 21,998 0.00 0.3123
2020-11-13 2020-09-30 13F AMGEN INC USD0.0001 COM 031162100 86,555 2,345 2.78 21,999 10.76 0.3764
2020-08-07 2020-06-30 13F AMGEN INC USD0.0001 COM 031162100 84,210 6,572 8.46 19,862 26.19 0.4032
2020-05-04 2020-03-31 13F AMGEN INC USD0.0001 COM 031162100 77,638 9,980 14.75 15,740 -3.49 0.4584
2020-02-11 2019-12-31 13F AMGEN INC USD0.0001 COM 031162100 67,658 -22,680 -25.11 16,310 -6.70 0.4294
2019-11-13 2019-09-30 13F AMGEN INC USD0.0001 COM 031162100 90,338 29,193 47.74 17,481 55.14 0.4965
2019-08-12 2019-06-30 13F AMGEN INC USD0.0001 COM 031162100 61,145 -32 -0.05 11,268 -3.05 0.3528
2019-05-09 2019-03-31 13F AMGEN INC USD0.0001 COM 031162100 61,177 -5,952 -8.87 11,622 -11.07 0.3822
2019-02-12 2018-12-31 13F AMGEN INC USD0.0001 COM 031162100 67,129 468 0.70 13,068 -5.43 0.5008
2018-10-12 2018-09-30 13F AMGEN INC USD0.0001 COM 031162100 66,661 -362 -0.54 13,818 11.69 0.4694
2018-07-16 2018-06-30 13F AMGEN INC USD0.0001 COM 031162100 67,023 5,329 8.64 12,372 17.63 0.4687
2018-04-06 2018-03-31 13F AMGEN INC USD0.0001 COM 031162100 61,694 5,695 10.17 10,518 8.01 0.4280
2018-01-24 2017-12-31 13F AMGEN INC USD0.0001 COM 031162100 55,999 2,128 3.95 9,738 -3.05 0.3963
2017-10-24 2017-09-30 13F AMGEN INC USD0.0001 COM 031162100 53,871 3,730 7.44 10,044 16.30 0.4373
2017-08-10 2017-06-30 13F AMGEN INC USD0.0001 COM 031162100 50,141 8,800 21.29 8,636 27.32 0.3848
2017-04-06 2017-03-31 13F AMGEN INC USD0.0001 COM 031162100 41,341 1,169 2.91 6,783 15.47 0.3092
2017-02-02 2016-12-31 13F AMGEN INC USD0.0001 COM 031162100 40,172 -110,973 -73.42 5,874 -76.70 0.2944
2016-10-24 2016-09-30 13F AMGEN INC USD0.0001 COM 031162100 151,145 5,450 3.74 25,212 13.74 1.3022
2016-08-03 2016-06-30 13F AMGEN INC USD0.0001 COM 031162100 145,695 9,025 6.60 22,167 8.18 1.2215
2016-04-08 2016-03-31 13F AMGEN INC USD0.0001 COM 031162100 136,670 -63 -0.05 20,491 -2.15 1.2460
2016-01-19 2015-12-31 13F AMGEN INC USD0.0001 COM 031162100 136,733 12,776 10.31 20,942 22.14 1.3297
2015-10-27 2015-09-30 13F AMGEN INC USD0.0001 COM 031162100 123,957 6,195 5.26 17,146 -5.16 1.1427
2015-08-05 2015-06-30 13F AMGEN INC USD0.0001 COM 031162100 117,762 -117 -0.10 18,079 -4.05 1.1740
2015-04-10 2015-03-31 13F AMGEN INC USD0.0001 COM 031162100 117,879 2,195 1.90 18,843 2.26 1.2467
2015-01-21 2014-12-31 13F AMGEN INC USD0.0001 COM 031162100 115,684 0 0.00 18,427 13.40 1.2116
2014-10-23 2014-09-30 13F AMGEN INC US$0.0001 COM 031162100 115,684 113,885 6,330.46 16,249 7,528.64 1.1286
2014-07-02 2014-06-30 13F AMGEN INC US$0.0001 COM 031162100 1,799 0 0.00 213 -4.05 0.0151
2014-04-11 2014-03-31 13F/A-1 AMGEN INC US$0.0001 COM 031162100 1,799 1,799 222 0.0178
2014-04-10 2014-03-31 13F BAKER HUGHES INC US$1 COM 031162100 3,640 237
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.