Amphastar Pharmaceuticals, Inc.
DE ˙ DB ˙ US03209R1032
15,10 € ↓ -0,31 (-2,04%)
2026-06-04
AKTIENPREIS
SecurityDE:29A / Amphastar Pharmaceuticals, Inc.
InstitutionMillennium Management Llc
ManagerIsrael Englander
Latest Disclosed Ownership371,373 shares
Latest Disclosed Value $ 7,275,197
Millennium Management Llc reports 27.76% increase in ownership of 29A / Amphastar Pharmaceuticals, Inc.

On May 15, 2026 - Millennium Management Llc filed a 13F-HR form disclosing ownership of 371,373 shares of Amphastar Pharmaceuticals, Inc. (DE:29A) valued at $6,092,374 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 290,673 shares of Amphastar Pharmaceuticals, Inc.. This represents a change in shares of 27.76% during the quarter. The current value of the position is $5,609,589 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 371,373 80,700 27.76 7,275 -6.54 0.0030
2026-02-17 2025-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 290,673 -407,092 -58.34 7,784 -58.14 0.0033
2025-11-14 2025-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 697,765 78,781 12.73 18,595 30.85 0.0079
2025-08-14 2025-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 618,984 -249,567 -28.73 14,212 -43.56 0.0069
2025-05-15 2025-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 868,551 611,995 238.54 25,179 164.35 0.0134
2025-02-14 2024-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 256,556 -3,094 -1.19 9,526 -24.40 0.0047
2024-11-14 2024-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 259,650 -479,098 -64.85 12,601 -57.36 0.0060
2024-08-14 2024-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 738,748 338,653 84.64 29,550 68.20 0.0137
2024-05-15 2024-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 400,095 195,078 95.15 17,568 38.55 0.0075
2024-02-14 2023-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 205,017 -91,290 -30.81 12,680 -6.95 0.0055
2023-11-14 2023-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 296,307 68,077 29.83 13,627 3.90 0.0069
2023-08-14 2023-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 228,230 -115,330 -33.57 13,116 1.80 0.0065
2023-05-15 2023-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 343,560 246,130 252.62 12,884 371.94 0.0074
2023-02-14 2022-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 97,430 83,670 608.07 2,730 605.43 0.0015
2022-11-14 2022-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 13,760 -68,281 -83.23 387 -86.44 0.0002
2022-08-15 2022-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 82,041 -91,280 -52.67 2,854 -54.13 0.0018
2022-05-16 2022-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 173,321 100,140 136.84 6,222 265.14 0.0033
2022-02-14 2021-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 73,181 -123,757 -62.84 1,704 -54.49 0.0009
2021-11-15 2021-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 196,938 180,428 1,092.84 3,744 1,024.32 0.0022
2021-08-16 2021-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 16,510 -103,185 -86.21 333 -84.82 0.0002
2021-05-17 2021-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 119,695 -59,998 -33.39 2,193 -39.32 0.0016
2021-02-16 2020-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 179,693 52,228 40.97 3,614 51.21 0.0026
2020-11-16 2020-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 127,465 83,631 190.79 2,390 142.64 0.0029
2020-08-14 2020-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 43,834 43,834 985 0.0013
2020-02-14 2019-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 0 -54,180 -100.00 0 -100.00
2019-11-14 2019-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 54,180 39,389 266.30 1,074 244.23 0.0017
2019-08-15 2019-06-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 14,791 -5,746 -27.98 312 -25.71 0.0005
2019-08-14 2019-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 14,791 -5,746 312
2019-05-14 2019-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 20,537 -119,970 -85.38 420 -84.98 0.0006
2019-02-15 2018-12-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 140,507 56,001 66.27 2,796 71.96 0.0044
2019-02-14 2018-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 140,507 2,796
2018-11-14 2018-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 84,506 45,986 119.38 1,626 176.53 0.0020
2018-08-14 2018-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 38,520 -5,106 -11.70 588 -28.12 0.0008
2018-05-15 2018-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 43,626 -250,046 -85.14 818 -85.52 0.0011
2018-02-14 2017-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 293,672 277,771 1,746.88 5,650 1,889.44 0.0078
2017-11-14 2017-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 15,901 -800 -4.79 284 -4.70 0.0004
2017-08-14 2017-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 16,701 16,701 298 0.0005
2016-08-15 2016-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 0 -39,142 -100.00 0 -100.00
2016-05-16 2016-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 39,142 -98,807 -71.63 470 -76.06 0.0012
2016-02-16 2015-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 137,949 81,912 146.17 1,963 199.69 0.0041
2015-11-16 2015-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 56,037 -66,735 -54.36 655 -69.65 0.0013
2015-08-14 2015-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 122,772 38,297 45.34 2,158 70.73 0.0041
2015-05-15 2015-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 84,475 58,053 219.71 1,264 311.73 0.0024
2015-02-17 2014-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 26,422 26,422 307 0.0007
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.