Amgen Inc.
MX ˙ BMV ˙ NL0000888691
SecurityMX:AMGN / Amgen Inc.
InstitutionRiverstone Advisors, LLC
Latest Disclosed Ownership2,949 shares
Latest Disclosed Value $ 1,037,606
Riverstone Advisors, LLC reports 4.06% increase in ownership of AMGN / Amgen Inc.

On April 21, 2026 - Riverstone Advisors, LLC filed a 13F-HR form disclosing ownership of 2,949 shares of Amgen Inc. (MX:AMGN) valued at $1,037,606 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 2,834 shares of Amgen Inc.. This represents a change in shares of 4.06% 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)
2026-04-21 2026-03-31 13F AMGEN COM 031162100 2,949 115 4.06 1,038 11.87 0.5116
2026-02-02 2025-12-31 13F AMGEN COM 031162100 2,834 108 3.96 928 20.55 0.4370
2025-11-07 2025-09-30 13F AMGEN COM 031162100 2,726 0 0.00 769 1.05 0.3773
2025-08-12 2025-06-30 13F AMGEN COM 031162100 2,726 0 0.00 761 -10.37 0.4115
2025-04-25 2025-03-31 13F AMGEN COM 031162100 2,726 -20 -0.73 849 18.74 0.5107
2025-01-24 2024-12-31 13F AMGEN COM 031162100 2,746 0 0.00 716 -19.12 0.4078
2024-11-04 2024-09-30 13F AMGEN COM 031162100 2,746 0 0.00 885 3.15 0.5145
2024-07-22 2024-06-30 13F AMGEN COM 031162100 2,746 0 0.00 858 9.87 0.5272
2024-05-10 2024-03-31 13F AMGEN COM 031162100 2,746 0 0.00 781 -1.27 0.4655
2024-01-30 2023-12-31 13F AMGEN COM 031162100 2,746 0 0.00 791 7.05 0.5118
2023-11-09 2023-09-30 13F AMGEN COM 031162100 2,746 15 0.55 738 21.78 0.5102
2023-08-03 2023-06-30 13F AMGEN COM 031162100 2,731 -6 -0.22 606 -8.32 0.3679
2023-05-02 2023-03-31 13F AMGEN COM 031162100 2,737 0 0.00 662 -7.94 0.4225
2023-01-31 2022-12-31 13F AMGEN COM 031162100 2,737 -1,560 -36.30 719 -25.90 0.4989
2022-10-27 2022-09-30 13F AMGEN COM 031162100 4,297 -20 -0.46 969 -7.71 0.6238
2022-07-26 2022-06-30 13F AMGEN COM 031162100 4,317 0 0.00 1,050 0.57 0.6592
2022-04-29 2022-03-31 13F AMGEN COM 031162100 4,317 323 8.09 1,044 16.13 0.5358
2022-01-26 2021-12-31 13F AMGEN COM 031162100 3,994 122 3.15 899 9.23 0.3957
2021-11-04 2021-09-30 13F AMGEN COM 031162100 3,872 0 0.00 823 -12.82 0.3797
2021-07-28 2021-06-30 13F AMGEN COM 031162100 3,872 -46 -1.17 944 -3.18 0.4467
2021-04-26 2021-03-31 13F AMGEN COM 031162100 3,918 0 0.00 975 8.21 0.5095
2021-02-02 2020-12-31 13F AMGEN COM 031162100 3,918 0 0.00 901 -9.54 0.5006
2020-10-28 2020-09-30 13F AMGEN COM 031162100 3,918 0 0.00 996 7.79 0.6623
2020-07-22 2020-06-30 13F AMGEN COM 031162100 3,918 -50 -1.26 924 14.93 0.6873
2020-04-29 2020-03-31 13F AMGEN COM 031162100 3,968 0 0.00 804 -15.99 0.8131
2020-01-31 2019-12-31 13F AMGEN COM 031162100 3,968 0 0.00 957 24.61 0.7146
2019-10-25 2019-09-30 13F AMGEN COM 031162100 3,968 0 0.00 768 5.06 0.5894
2019-07-30 2019-06-30 13F AMGEN COM 031162100 3,968 -133 -3.24 731 -6.16 0.5712
2019-05-09 2019-03-31 13F AMGEN COM 031162100 4,101 0 0.00 779 -2.38 0.6552
2019-02-15 2018-12-31 13F AMGEN COM 031162100 4,101 4,101 798 0.7970
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.