Amgen Inc.
CH ˙ SWX ˙ NL0000888691
SecurityCH:AMGN / Amgen Inc.
InstitutionHennessy Advisors Inc
Latest Disclosed Ownership12,050 shares
Latest Disclosed Value $ 4,239,793
Hennessy Advisors Inc reports 8.02% decrease in ownership of AMGN / Amgen Inc.

On April 21, 2026 - Hennessy Advisors Inc filed a 13F-HR form disclosing ownership of 12,050 shares of Amgen Inc. (CH:AMGN) valued at $4,239,793 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 13,100 shares of Amgen Inc.. This represents a change in shares of -8.02% 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 12,050 -1,050 -8.02 4,240 -1.12 0.1531
2026-01-27 2025-12-31 13F Amgen COM 031162100 13,100 -650 -4.73 4,288 10.49 0.1520
2025-10-20 2025-09-30 13F Amgen COM 031162100 13,750 -100 -0.72 3,880 0.34 0.1340
2025-07-21 2025-06-30 13F Amgen COM 031162100 13,850 150 1.09 3,867 -9.40 0.1289
2025-04-16 2025-03-31 13F Amgen COM 031162100 13,700 350 2.62 4,268 22.68 0.1421
2025-01-15 2024-12-31 13F Amgen COM 031162100 13,350 250 1.91 3,480 -17.56 0.1035
2024-10-16 2024-09-30 13F Amgen COM 031162100 13,100 -200 -1.50 4,221 1.56 0.1352
2024-07-23 2024-06-30 13F Amgen COM 031162100 13,300 100 0.76 4,156 10.71 0.1573
2024-04-16 2024-03-31 13F Amgen COM 031162100 13,200 -2,300 -14.84 3,753 -15.93 0.1580
2024-01-18 2023-12-31 13F AMGEN COM 031162100 15,500 6,200 66.67 4,464 78.63 0.3322
2023-10-18 2023-09-30 13F AMGEN COM 031162100 9,300 -200 -2.11 2,499 18.49 0.1752
2023-07-17 2023-06-30 13F AMGEN COM 031162100 9,500 -550 -5.47 2,109 -13.17 0.1520
2023-04-14 2023-03-31 13F AMGEN COM 031162100 10,050 -24,700 -71.08 2,430 26,888.89 0.1789
2023-01-20 2022-12-31 13F AMGEN COM 031162100 34,750 -10,000 -22.35 9 -99.91 0.5996
2022-11-08 2022-09-30 13F AMGEN COM 031162100 44,750 100 0.22 10,087 -7.14 0.6971
2022-08-12 2022-06-30 13F AMGEN COM 031162100 44,650 -200 -0.45 10,863 0.16 0.6502
2022-05-12 2022-03-31 13F AMGEN COM 031162100 44,850 13,800 44.44 10,846 55.28 0.5685
2022-01-25 2021-12-31 13F AMGEN COM 031162100 31,050 8,900 40.18 6,985 48.30 0.3967
2021-10-12 2021-09-30 13F AMGEN COM 031162100 22,150 1,950 9.65 4,710 -4.35 0.2811
2021-07-28 2021-06-30 13F AMGEN COM 031162100 20,200 1,150 6.04 4,924 3.88 0.2734
2021-04-19 2021-03-31 13F AMGEN COM 031162100 19,050 -12,150 -38.94 4,740 -33.93 0.2757
2021-01-25 2020-12-31 13F AMGEN COM 031162100 31,200 -1,600 -4.88 7,174 -13.94 0.4608
2020-10-16 2020-09-30 13F AMGEN COM 031162100 32,800 -700 -2.09 8,336 5.51 0.5799
2020-07-20 2020-06-30 13F AMGEN COM 031162100 33,500 -900 -2.62 7,901 13.29 0.5502
2020-04-14 2020-03-31 13F AMGEN COM 031162100 34,400 -3,400 -8.99 6,974 -23.46 0.5242
2020-01-14 2019-12-31 13F AMGEN COM 031162100 37,800 -2,200 -5.50 9,112 17.73 0.4638
2019-10-07 2019-09-30 13F AMGEN COM 031162100 40,000 -1,100 -2.68 7,740 2.19 0.3889
2019-07-11 2019-06-30 13F AMGEN COM 031162100 41,100 -100 -0.24 7,574 -3.23 0.3630
2019-04-08 2019-03-31 13F AMGEN COM 031162100 41,200 11,000 36.42 7,827 33.13 0.3637
2019-01-14 2018-12-31 13F AMGEN COM 031162100 30,200 -1,100 -3.51 5,879 -9.39 0.2886
2018-10-10 2018-09-30 13F AMGEN COM 031162100 31,300 0 0.00 6,488 12.29 0.2395
2018-07-20 2018-06-30 13F AMGEN COM 031162100 31,300 0 0.00 5,778 8.28 0.1981
2018-05-02 2018-03-31 13F AMGEN COM 031162100 31,300 31,300 5,336 0.1793
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.