Amgen Inc.
CH ˙ SWX ˙ NL0000888691
SecurityCH:AMGN / Amgen Inc.
InstitutionO'Brien Greene & Co. Inc
Latest Disclosed Ownership29,635 shares
Latest Disclosed Value $ 10,426,933
O'Brien Greene & Co. Inc reports 0.12% decrease in ownership of AMGN / Amgen Inc.

On May 6, 2026 - O'Brien Greene & Co. Inc filed a 13F-HR form disclosing ownership of 29,635 shares of Amgen Inc. (CH:AMGN) valued at $10,426,933 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 29,671 shares of Amgen Inc.. This represents a change in shares of -0.12% 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)
2026-05-06 2026-03-31 13F Amgen COM 031162100 29,635 -36 -0.12 10,427 7.36 1.6637
2026-02-05 2025-12-31 13F Amgen COM 031162100 29,671 85 0.29 9,712 16.31 2.8831
2025-11-10 2025-09-30 13F Amgen COM 031162100 29,586 -270 -0.90 8,349 0.16 2.5676
2025-08-06 2025-06-30 13F Amgen COM 031162100 29,856 -1,018 -3.30 8,336 -13.33 2.7266
2025-05-12 2025-03-31 13F Amgen COM 031162100 30,874 -503 -1.60 9,619 17.61 3.2268
2025-02-03 2024-12-31 13F Amgen COM 031162100 31,377 73 0.23 8,178 -18.92 2.6552
2024-11-15 2024-09-30 13F Amgen COM 031162100 31,304 -1,101 -3.40 10,086 -0.38 3.1409
2024-08-12 2024-06-30 13F Amgen COM 031162100 32,405 3,248 11.14 10,125 22.14 3.2064
2024-05-02 2024-03-31 13F Amgen COM 031162100 29,157 -165 -0.56 8,290 -1.85 2.7257
2024-02-02 2023-12-31 13F Amgen COM 031162100 29,322 1,224 4.36 8,445 11.84 2.9697
2023-11-08 2023-09-30 13F AMGEN COM 031162100 28,098 869 3.19 7,552 125,750.00 2.7623
2023-08-15 2023-06-30 13F/A-1 AMGEN COM 031162100 27,229 -279 -1.01 6 0.00 2.1016
2023-07-20 2023-06-30 13F AMGEN COM 031162100 81,687 54,179 18 2.1149
2023-05-03 2023-03-31 13F AMGEN COM 031162100 27,508 560 2.08 7 -14.29 2.4911
2023-02-02 2022-12-31 13F AMGEN COM 031162100 26,948 -51,307 -65.56 7 -99.96 2.6839
2022-11-09 2022-09-30 13F AMGEN COM 031162100 78,255 52,903 208.67 17,639 185.98 2.3373
2022-08-11 2022-06-30 13F AMGEN COM 031162100 25,352 305 1.22 6,168 1.83 2.3292
2022-05-18 2022-03-31 13F AMGEN COM 031162100 25,047 97 0.39 6,057 7.91 1.9997
2022-02-08 2021-12-31 13F AMGEN COM 031162100 24,950 -13 -0.05 5,613 5.73 1.8438
2021-11-12 2021-09-30 13F AMGEN COM 031162100 24,963 184 0.74 5,309 -12.09 1.9365
2021-08-09 2021-06-30 13F AMGEN COM 031162100 24,779 534 2.20 6,039 0.10 2.1558
2021-05-12 2021-03-31 13F AMGEN COM 031162100 24,245 -55 -0.23 6,033 7.98 2.3905
2021-02-04 2020-12-31 13F AMGEN COM 031162100 24,300 130 0.54 5,587 -9.05 2.2984
2020-11-09 2020-09-30 13F AMGEN COM 031162100 24,170 -485 -1.97 6,143 5.64 2.9202
2020-08-10 2020-06-30 13F AMGEN COM 031162100 24,655 115 0.47 5,815 16.88 3.0777
2020-05-07 2020-03-31 13F AMGEN COM 031162100 24,540 -160 -0.65 4,975 -16.46 3.3114
2020-02-05 2019-12-31 13F AMGEN COM 031162100 24,700 -475 -1.89 5,955 22.23 3.0241
2019-11-07 2019-09-30 13F AMGEN COM 031162100 25,175 370 1.49 4,872 6.58 2.6145
2019-08-21 2019-06-30 13F AMGEN COM 031162100 24,805 387 1.58 4,571 -1.47 2.3960
2019-04-29 2019-03-31 13F AMGEN COM 031162100 24,418 570 2.39 4,639 -0.09 2.3411
2019-02-27 2018-12-31 13F AMGEN COM 031162100 23,848 23,848 4,643 2.7665
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.