Amgen Inc.
US ˙ NasdaqGS ˙ US0311621009

SecurityAMGN / Amgen Inc.
InstitutionChicago Capital, LLC
Latest Disclosed Ownership12,214 shares
Latest Disclosed Value $ 4,297,496
Chicago Capital, LLC reports 1.39% increase in ownership of AMGN / Amgen Inc.

On April 23, 2026 - Chicago Capital, LLC filed a 13F-HR form disclosing ownership of 12,214 shares of Amgen Inc. (US:AMGN) valued at $4,297,496 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 12,047 shares of Amgen Inc.. This represents a change in shares of 1.39% during the quarter. The current value of the position is $4,131,019 USD.

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)
2026-04-23 2026-03-31 13F AMGEN COM 031162100 12,214 167 1.39 4,297 8.98 0.1159
2026-01-26 2025-12-31 13F AMGEN COM 031162100 12,047 14 0.12 3,943 16.14 0.0974
2025-10-22 2025-09-30 13F AMGEN COM 031162100 12,033 -872 -6.76 3,396 -5.77 0.0836
2025-07-17 2025-06-30 13F AMGEN COM 031162100 12,905 -263 -2.00 3,603 -12.16 0.0889
2025-04-17 2025-03-31 13F AMGEN COM 031162100 13,168 -1,212 -8.43 4,103 9.47 0.1159
2025-01-24 2024-12-31 13F AMGEN COM 031162100 14,380 16 0.11 3,748 -19.04 0.0994
2024-10-18 2024-09-30 13F AMGEN COM 031162100 14,364 -3,987 -21.73 4,628 -19.27 0.1285
2024-08-06 2024-06-30 13F AMGEN COM 031162100 18,351 -567 -3.00 5,734 6.60 0.1705
2024-04-15 2024-03-31 13F AMGEN COM 031162100 18,918 308 1.66 5,379 0.34 0.1639
2024-01-22 2023-12-31 13F AMGEN COM 031162100 18,610 6,407 52.50 5,360 63.46 0.1930
2023-10-25 2023-09-30 13F AMGEN COM 031162100 12,203 0 0.00 3,280 21.04 0.1534
2023-07-20 2023-06-30 13F AMGEN COM 031162100 12,203 0 0.00 2,709 -8.17 0.1221
2023-04-18 2023-03-31 13F AMGEN COM 031162100 12,203 -113 -0.92 2,950 -8.78 0.1468
2023-01-20 2022-12-31 13F AMGEN COM 031162100 12,316 0 0.00 3,235 16.50 0.1789
2022-10-14 2022-09-30 13F AMGEN COM 031162100 12,316 5 0.04 2,776 -7.31 0.1606
2022-07-21 2022-06-30 13F AMGEN COM 031162100 12,311 250 2.07 2,995 2.67 0.1655
2022-04-21 2022-03-31 13F AMGEN COM 031162100 12,061 600 5.24 2,917 13.15 0.1256
2022-01-20 2021-12-31 13F AMGEN COM 031162100 11,461 0 0.00 2,578 5.79 0.0960
2021-10-28 2021-09-30 13F AMGEN COM 031162100 11,461 -300 -2.55 2,437 -15.00 0.0924
2021-07-22 2021-06-30 13F AMGEN COM 031162100 11,761 -580 -4.70 2,867 -6.64 0.1120
2021-04-13 2021-03-31 13F AMGEN COM 031162100 12,341 0 0.00 3,071 8.25 0.1296
2021-01-25 2020-12-31 13F AMGEN COM 031162100 12,341 30 0.24 2,837 -9.33 0.1267
2020-10-13 2020-09-30 13F AMGEN COM 031162100 12,311 0 0.00 3,129 7.75 0.1609
2020-07-29 2020-06-30 13F AMGEN COM 031162100 12,311 2,352 23.62 2,904 43.83 0.1683
2020-04-21 2020-03-31 13F AMGEN COM 031162100 9,959 0 0.00 2,019 -15.91 0.1628
2020-01-14 2019-12-31 13F AMGEN COM 031162100 9,959 -70 -0.70 2,401 23.70 0.1465
2019-10-28 2019-09-30 13F AMGEN COMMON 031162100 10,029 170 1.72 1,941 6.82 0.1300
2019-07-11 2019-06-30 13F AMGEN COMMON 031162100 9,859 1,811 22.50 1,817 18.84 0.1162
2019-04-23 2019-03-31 13F AMGEN COMMON 031162100 8,048 -2,114 -20.80 1,529 -22.70 0.1039
2019-02-11 2018-12-31 13F AMGEN COM 031162100 10,162 -288 -2.76 1,978 -8.68 0.1613
2018-11-02 2018-09-30 13F AMGEN COM 031162100 10,450 -450 -4.13 2,166 7.65 0.1498
2018-07-19 2018-06-30 13F AMGEN COM 031162100 10,900 2,707 33.04 2,012 44.02 0.1622
2018-05-09 2018-03-31 13F Amgen COM 031162100 8,193 8,193 1,397 0.1864
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.