Amgen Inc.
CH ˙ SWX ˙ NL0000888691
SecurityCH:AMGN / Amgen Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership914,016 shares
Latest Disclosed Value $ 321,596,421
Rhumbline Advisers reports 1.83% decrease in ownership of AMGN / Amgen Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 914,016 shares of Amgen Inc. (CH:AMGN) valued at $321,596,421 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 931,065 shares of Amgen Inc.. This represents a change in shares of -1.83% 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)
2026-05-12 2026-03-31 13F AMGEN INC COM COM 031162100 914,016 -17,049 -1.83 321,596 5.53 0.2751
2026-02-13 2025-12-31 13F AMGEN INC COM COM 031162100 931,065 -27,085 -2.83 304,747 12.71 0.2464
2025-11-06 2025-09-30 13F AMGEN INC COM COM 031162100 958,150 -6,685 -0.69 270,390 0.37 0.2172
2025-08-12 2025-06-30 13F AMGEN INC COM COM 031162100 964,835 -14,804 -1.51 269,391 -11.73 0.2307
2025-05-29 2025-03-31 13F/A-1 AMGEN INC COM COM 031162100 979,639 -23,183 -2.31 305,206 16.77 0.2855
2025-04-08 2025-03-31 13F AMGEN INC COM COM 031162100 979,639 -23,183 305,206 0.2855
2025-05-29 2024-12-31 13F/A-1 AMGEN INC COM COM 031162100 1,002,822 -14,456 -1.42 261,375 -20.26 0.2338
2025-01-30 2024-12-31 13F AMGEN INC COM COM 031162100 1,002,822 -14,456 261,375 0.2338
2024-11-12 2024-09-30 13F AMGEN INC COM COM 031162100 1,017,278 -44,449 -4.19 327,777 -1.19 0.2957
2024-08-01 2024-06-30 13F AMGEN INC COM COM 031162100 1,061,727 -197 -0.02 331,736 9.87 0.3118
2024-05-09 2024-03-31 13F AMGEN INC COM COM 031162100 1,061,924 -2,297 -0.22 301,926 -1.50 0.2899
2024-02-08 2023-12-31 13F AMGEN INC COM COM 031162100 1,064,221 2,970 0.28 306,517 7.47 0.3213
2023-11-09 2023-09-30 13F AMGEN INC COM COM 031162100 1,061,251 10,962 1.04 285,222 22.32 0.3311
2023-08-08 2023-06-30 13F AMGEN INC COM COM 031162100 1,050,289 12,035 1.16 233,185 93,174.00 0.2612
2023-05-11 2023-03-31 13F AMGEN INC COM COM 031162100 1,038,254 36,641 3.66 251 -99.90 0.3097
2023-02-14 2022-12-31 13F AMGEN INC COM COM 031162100 1,001,613 30,522 3.14 263,064 20.18 0.3536
2022-11-10 2022-09-30 13F AMGEN INC COM COM 031162100 971,091 46,014 4.97 218,884 -2.75 0.3261
2022-08-11 2022-06-30 13F AMGEN INC COM COM 031162100 925,077 -21,198 -2.24 225,071 -1.64 0.3284
2022-05-12 2022-03-31 13F AMGEN INC COM COM 031162100 946,275 594 0.06 228,828 7.56 0.2945
2022-02-10 2021-12-31 13F AMGEN INC COM COM 031162100 945,681 13,379 1.44 212,750 7.31 0.2607
2021-11-12 2021-09-30 13F AMGEN INC COM COM 031162100 932,302 -54,029 -5.48 198,254 -17.54 0.2683
2021-08-05 2021-06-30 13F AMGEN INC COM COM 031162100 986,331 -55,094 -5.29 240,418 -7.22 0.3155
2021-05-06 2021-03-31 13F AMGEN INC COM COM 031162100 1,041,425 -98,088 -8.61 259,117 -1.10 0.3520
2021-02-10 2020-12-31 13F AMGEN INC COM COM 031162100 1,139,513 -21,963 -1.89 261,997 -11.25 0.3616
2020-11-12 2020-09-30 13F AMGEN INC COM COM 031162100 1,161,476 44,191 3.96 295,201 12.02 0.4626
2020-08-13 2020-06-30 13F AMGEN INC COM COM 031162100 1,117,285 80,302 7.74 263,523 25.35 0.4401
2020-05-06 2020-03-31 13F AMGEN INC COM COM 031162100 1,036,983 -5,416 -0.52 210,228 -16.34 0.4406
2020-02-05 2019-12-31 13F AMGEN INC COM COM 031162100 1,042,399 -7,870 -0.75 251,291 23.64 0.4203
2019-10-23 2019-09-30 13F AMGEN INC COM COM 031162100 1,050,269 10,536 1.01 203,238 6.07 0.3714
2019-08-14 2019-06-30 13F AMGEN INC COM COM 031162100 1,039,733 -32,569 -3.04 191,602 -5.95 0.3597
2019-05-01 2019-03-31 13F AMGEN INC COM COM 031162100 1,072,302 33,709 3.25 203,716 0.76 0.3945
2019-01-31 2018-12-31 13F AMGEN INC COM COM 031162100 1,038,593 -129,554 -11.09 202,183 -16.50 0.4399
2018-11-07 2018-09-30 13F AMGEN INC COM COM 031162100 1,168,147 -84,029 -6.71 242,145 4.76 0.4677
2018-08-06 2018-06-30 13F AMGEN INC COM COM 031162100 1,252,176 -70,381 -5.32 231,139 2.51 0.4662
2018-05-02 2018-03-31 13F AMGEN INC COM COM 031162100 1,322,557 -87,844 -6.23 225,470 -8.07 0.4709
2018-02-09 2017-12-31 13F AMGEN INC COM COM 031162100 1,410,401 46,167 3.38 245,269 -3.57 0.4982
2017-11-06 2017-09-30 13F AMGEN INC COM COM 031162100 1,364,234 19,003 1.41 254,361 9.79 0.5531
2017-08-02 2017-06-30 13F AMGEN INC COM COM 031162100 1,345,231 30,710 2.34 231,689 7.43 0.5288
2017-05-02 2017-03-31 13F AMGEN INC COM COM 031162100 1,314,521 18,213 1.40 215,673 13.79 0.5038
2017-01-27 2016-12-31 13F AMGEN INC COM COM 031162100 1,296,308 28,672 2.26 189,533 -10.37 0.4803
2016-11-08 2016-09-30 13F AMGEN INC COM COM 031162100 1,267,636 38,882 3.16 211,454 13.10 0.5827
2016-08-11 2016-06-30 13F AMGEN INC COM COM 031162100 1,228,754 45,400 3.84 186,955 5.37 0.5539
2016-05-02 2016-03-31 13F AMGEN INC USD.000 COM 031162100 1,183,354 84,087 7.65 177,420 -0.57 0.5505
2016-02-03 2015-12-31 13F AMGEN INC USD.000 COM 031162100 1,099,267 -14,099 -1.27 178,444 15.87 0.5742
2015-11-04 2015-09-30 13F AMGEN INC USD.000 COM 031162100 1,113,366 2,037 0.18 154,001 -9.74 0.5239
2015-08-04 2015-06-30 13F AMGEN INC USD.000 COM 031162100 1,111,329 -171,188 -13.35 170,611 -16.78 0.5438
2015-05-12 2015-03-31 13F AMGEN INC USD.000 COM 031162100 1,282,517 -8,065 -0.62 205,010 -0.28 0.5914
2015-02-06 2014-12-31 13F AMGEN INC USD.000 COM 031162100 1,290,582 -32,275 -2.44 205,577 10.64 0.5972
2014-11-12 2014-09-30 13F AMGEN INC USD.000 COM 031162100 1,322,857 -5,015 -0.38 185,808 18.21 0.5581
2014-08-06 2014-06-30 13F AMGEN INC USD.000 COM 031162100 1,327,872 -34,934 -2.56 157,180 -6.49 0.4613
2014-05-06 2014-03-31 13F AMGEN INC USD.000 COM 031162100 1,362,806 -17,817 -1.29 168,088 6.65 0.4986
2014-02-03 2013-12-31 13F AMGEN INC USD.000 COM 031162100 1,380,623 -50,910 -3.56 157,612 -1.64 0.4649
2013-11-05 2013-09-30 13F AMGEN INC USD.000 COM 031162100 1,431,533 -24,787 -1.70 160,246 11.53 0.4965
2013-08-07 2013-06-30 13F AMGEN INC USD.000 COM 031162100 1,456,320 1,456,320 143,681 0.4617
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.