Amphastar Pharmaceuticals, Inc.
DE ˙ DB ˙ US03209R1032
15,10 € ↓ -0,31 (-2,04%)
2026-06-04
PREZZO DELLE AZIONI
SecurityDE:29A / Amphastar Pharmaceuticals, Inc.
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership56,430 shares
Latest Disclosed Value $ 1,511,195
Alliancebernstein L.p. reports 6.93% decrease in ownership of 29A / Amphastar Pharmaceuticals, Inc.

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 56,430 shares of Amphastar Pharmaceuticals, Inc. (DE:29A) valued at $925,734 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 60,630 shares of Amphastar Pharmaceuticals, Inc.. This represents a change in shares of -6.93% during the quarter. The current value of the position is $852,375 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)
2026-05-15 2026-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 56,430 -4,200 -6.93 1,511 -6.90 0.0005
2026-02-17 2025-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 60,630 10,000 19.75 1,624 20.31 0.0005
2025-11-14 2025-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 50,630 0 0.00 1,349 16.09 0.0004
2025-08-14 2025-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 50,630 0 0.00 1,162 -20.79 0.0004
2025-05-15 2025-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 50,630 0 0.00 1,468 -21.93 0.0005
2025-02-12 2024-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 50,630 889 1.79 1,880 -22.13 0.0006
2024-11-14 2024-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 49,741 -29 -0.06 2,414 21.26 0.0008
2024-08-14 2024-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 49,770 2,530 5.36 1,991 -4.05 0.0007
2024-05-14 2024-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 47,240 -29,650 -38.56 2,074 -56.38 0.0007
2024-02-14 2023-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 76,890 -55,060 -41.73 4,756 -21.64 0.0018
2023-11-14 2023-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 131,950 81,870 163.48 6,068 110.84 0.0026
2023-08-15 2023-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 50,080 5,183 11.54 2,878 71.00 0.0012
2023-05-15 2023-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 44,897 -35,547 -44.19 1,684 -25.33 0.0007
2023-02-15 2022-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 80,444 29,955 59.33 2,254 58.84 0.0010
2022-11-15 2022-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 50,489 142 0.28 1,419 -19.01 0.0007
2022-08-15 2022-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 50,347 4,141 8.96 1,752 5.61 0.0008
2022-05-13 2022-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 46,206 153 0.33 1,659 54.61 0.0006
2022-02-14 2021-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 46,053 -41,882 -47.63 1,073 -35.83 0.0004
2021-11-10 2021-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 87,935 40,265 84.47 1,672 73.99 0.0007
2021-07-30 2021-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 47,670 0 0.00 961 10.08 0.0004
2021-05-06 2021-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 47,670 -42,213 -46.96 873 -51.71 0.0004
2021-02-08 2020-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 89,883 1,073 1.21 1,808 8.59 0.0009
2020-11-12 2020-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 88,810 -19,200 -17.78 1,665 -31.37 0.0009
2020-08-13 2020-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 108,010 -180 -0.17 2,426 51.06 0.0014
2020-05-14 2020-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 108,190 -1,150 -1.05 1,606 -23.85 0.0012
2020-02-18 2019-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 109,340 1,400 1.30 2,109 -1.45 0.0012
2019-11-14 2019-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 107,940 -8,250 -7.10 2,140 -12.76 0.0013
2019-08-14 2019-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 116,190 14,400 14.15 2,453 17.93 0.0015
2019-05-14 2019-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 101,790 -21,110 -17.18 2,080 -14.96 0.0014
2019-02-13 2018-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 122,900 -1,200 -0.97 2,446 2.43 0.0018
2018-11-08 2018-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 124,100 0 0.00 2,388 26.08 0.0016
2018-08-13 2018-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 124,100 20,530 19.82 1,894 -2.47 0.0013
2018-05-14 2018-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 103,570 -9,950 -8.76 1,942 -11.08 0.0014
2018-02-13 2017-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 113,520 67,920 148.95 2,184 167.98 0.0016
2017-11-13 2017-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 45,600 0 0.00 815 0.12 0.0006
2017-08-10 2017-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 45,600 -10,000 -17.99 814 0.99 0.0006
2017-05-11 2017-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 55,600 -174,730 -75.86 806 -81.00 0.0006
2017-02-13 2016-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 230,330 15,910 7.42 4,243 4.30 0.0035
2016-11-10 2016-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 214,420 108,790 102.99 4,068 138.87 0.0034
2016-08-11 2016-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 105,630 66,370 169.05 1,703 261.57 0.0015
2016-05-13 2016-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 39,260 10,240 35.29 471 14.04 0.0004
2016-02-16 2015-12-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 29,020 320 1.11 413 22.92 0.0004
2016-02-12 2015-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 29,020 339
2015-11-13 2015-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 28,700 3,700 14.80 336 -23.64 0.0003
2015-08-14 2015-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 25,000 17,700 242.47 440 303.67 0.0004
2015-05-13 2015-03-31 13F AMPHASTAR PHARMACEUTICALS COM 03209R103 7,300 7,300 109 0.0001
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.