Amphastar Pharmaceuticals, Inc.
US ˙ NasdaqGS ˙ US03209R1032

SecurityAMPH / Amphastar Pharmaceuticals, Inc.
InstitutionBarclays Plc
Latest Disclosed Ownership75,319 shares
Latest Disclosed Value $ 2,017,043
Barclays Plc reports 13.27% increase in ownership of AMPH / Amphastar Pharmaceuticals, Inc.

On February 13, 2026 - Barclays Plc filed a 13F-HR form disclosing ownership of 75,319 shares of Amphastar Pharmaceuticals, Inc. (US:AMPH) valued at $2,017,043 USD as of December 31, 2025. The entity filed a previous 13F-HR/A on March 31, 2026 disclosing 66,494 shares of Amphastar Pharmaceuticals, Inc.. This represents a change in shares of 13.27% during the quarter. The current value of the position is $1,364,780 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)
2026-02-13 2025-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 75,319 8,825 13.27 2,017 13.83 0.0005
2026-03-31 2025-09-30 13F/A-3 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 66,494 -15,593 -19.00 1,772 -5.94 0.0004
2026-03-19 2025-09-30 13F/A-2 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 74,456 -7,631 3,613 0.0010
2025-11-12 2025-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 66,494 -15,593 1,772 0.0004
2026-02-27 2025-06-30 13F/A-2 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 82,087 15,135 22.61 1,885 -2.89 0.0004
2025-08-14 2025-06-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 82,087 15,135 2 0.0004
2025-08-13 2025-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 82,087 15,135 2 0.0001
2026-03-17 2025-03-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 66,952 -17,838 -21.04 1,941 -38.37 0.0006
2025-05-15 2025-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 66,952 -17,838 2 0.0006
2026-03-19 2024-12-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 84,790 10,334 13.88 3,148 -12.87 0.0009
2025-02-13 2024-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 84,790 10,334 3 0.0009
2026-03-31 2024-09-30 13F/A-2 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 74,456 25,878 53.27 3,613 85.95 0.0010
2024-11-19 2024-09-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 74,456 25,878 4 0.0010
2024-11-15 2024-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 74,456 25,878 4 0.0003
2026-03-23 2024-06-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 48,578 -22,254 -31.42 1,943 -37.52 0.0006
2024-08-14 2024-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 48,578 -22,254 2 0.0006
2026-03-24 2024-03-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 70,832 7,590 12.00 3,110 -20.48 0.0011
2024-05-15 2024-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 70,832 7,590 3 0.0011
2026-03-25 2023-12-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 63,242 39,449 165.80 3,912 257.50 0.0014
2024-02-15 2023-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 63,242 39,449 4 0.0014
2026-03-26 2023-09-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 23,793 -6,464 -21.36 1,094 -37.05 0.0007
2023-11-07 2023-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 23,793 -6,464 1 0.0007
2026-03-30 2023-06-30 13F/A-2 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 30,257 -11,057 -26.76 1,739 12.20 0.0011
2023-09-20 2023-06-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 30,257 -11,057 2 0.0011
2023-08-03 2023-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 30,257 -11,057 2 0.0011
2026-03-30 2023-03-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 41,314 -21,616 -34.35 1,549 -12.14 0.0007
2023-05-04 2023-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 41,314 -21,616 2 0.0007
2026-03-30 2022-12-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 62,930 7,426 13.38 1,763 13.09 0.0008
2023-02-13 2022-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 62,930 7,426 2 0.0008
2022-11-03 2022-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 55,504 -8,614 -13.43 1,559 -30.15 0.0017
2022-08-12 2022-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 64,118 11,773 22.49 2,232 18.79 0.0014
2022-05-16 2022-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 52,345 -21,085 -28.71 1,879 9.88 0.0015
2022-02-23 2021-12-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 73,430 9,613 15.06 1,710 41.09 0.0006
2022-02-14 2021-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 73,430 9,613 1,710 0.0002
2021-11-09 2021-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 63,817 18,131 39.69 1,212 31.60 0.0005
2021-08-13 2021-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 45,686 -29,431 -39.18 921 -33.12 0.0004
2021-05-13 2021-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 75,117 2,229 3.06 1,377 -6.13 0.0007
2021-02-11 2020-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 72,888 4,109 5.97 1,467 13.72 0.0008
2020-11-12 2020-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 68,779 12,711 22.67 1,290 2.54 0.0008
2020-08-12 2020-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 56,068 12,793 29.56 1,258 95.95 0.0010
2020-05-13 2020-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 43,275 -11,686 -21.26 642 -39.43 0.0005
2020-02-10 2019-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 54,961 17,564 46.97 1,060 42.86 0.0006
2019-11-15 2019-09-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 37,397 -4,004 -9.67 742 -15.01 0.0005
2019-11-14 2019-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 37,397 -4,004 742 171.5512
2019-08-14 2019-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 41,401 10,352 33.34 873 37.70 0.0005
2019-05-15 2019-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 31,049 17,733 133.17 634 139.25 0.0004
2019-02-14 2018-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 13,316 -24,796 -65.06 265 -63.85 0.0002
2018-11-14 2018-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 38,112 19,823 108.39 733 163.67 0.0005
2018-08-14 2018-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 18,289 759 4.33 278 -15.24 0.0002
2018-05-15 2018-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 17,530 11,746 203.08 328 192.86 0.0003
2018-02-14 2017-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 5,784 4,942 586.94 112 646.67 0.0001
2017-11-14 2017-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 842 -5,026 -85.65 15 -85.71 0.0000
2017-08-14 2017-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 5,868 1,871 46.81 105 77.97 0.0001
2017-05-15 2017-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 3,997 -83,695 -95.44 59 -96.35 0.0001
2017-02-14 2016-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 87,692 47,590 118.67 1,615 112.50 0.0017
2016-11-14 2016-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 40,102 34,249 585.15 760 708.51 0.0008
2016-08-12 2016-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 5,853 3,146 116.22 94 184.85 0.0001
2016-05-16 2016-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 2,707 1,997 281.27 33 266.67 0.0001
2016-02-12 2015-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 710 -13,442 -94.98 9 -94.23 0.0000
2015-11-13 2015-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 14,152 13,452 1,921.71 156 1,200.00 0.0002
2015-08-14 2015-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 700 -84 -10.71 12 9.09 0.0000
2015-05-19 2015-03-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 784 58 7.99 11 37.50 0.0000
2015-05-14 2015-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 784 11
2015-02-13 2014-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 726 726 8 0.0000
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.