Amphastar Pharmaceuticals, Inc.
DE ˙ DB ˙ US03209R1032
15,10 € ↓ -0,31 (-2,04%)
2026-06-04
CENA AKCJI
SecurityDE:29A / Amphastar Pharmaceuticals, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership420,337 shares
Latest Disclosed Value $ 8,234,414
Morgan Stanley reports 28.95% decrease in ownership of 29A / Amphastar Pharmaceuticals, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 420,337 shares of Amphastar Pharmaceuticals, Inc. (DE:29A) valued at $6,895,628 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 591,631 shares of Amphastar Pharmaceuticals, Inc.. This represents a change in shares of -28.95% during the quarter. The current value of the position is $6,349,190 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 420,337 -171,294 -28.95 8,234 -48.03 0.0005
2026-05-27 2025-12-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 591,631 16,952 2.95 15,844 3.45 0.0009
2026-02-13 2025-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 591,631 16,952 15,844 0.0009
2026-05-27 2025-09-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 574,679 -106,543 -15.64 15,315 -2.08 0.0009
2025-11-14 2025-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 574,679 -106,543 15,315 0.0009
2025-08-15 2025-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 681,222 159,110 30.47 15,641 3.33 0.0010
2025-05-15 2025-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 522,112 -109,962 -17.40 15,136 -35.50 0.0011
2025-05-15 2024-12-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 632,074 -45,552 -6.72 23,469 -28.64 0.0016
2025-02-14 2024-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 632,074 -45,552 23,469 0.0016
2025-05-14 2024-09-30 13F/A-2 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 677,626 67,489 11.06 32,885 34.75 0.0024
2025-02-14 2024-09-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 677,626 67,489 32,885 0.0024
2024-11-14 2024-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 677,626 67,489 32,885 0.0003
2025-05-14 2024-06-30 13F/A-2 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 610,137 51,098 9.14 24,405 -0.58 0.0019
2024-10-17 2024-06-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 610,137 51,098 24,405 0.0019
2024-08-14 2024-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 610,137 51,098 24,405 0.0019
2024-10-17 2024-03-31 13F/A-2 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 559,039 -12,074 -2.11 24,547 -30.51 0.0020
2024-08-16 2024-03-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 559,039 -12,074 24,547 0.0002
2024-05-15 2024-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 559,039 -12,074 24,547 0.0020
2024-08-16 2023-12-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 571,113 12,904 2.31 35,323 37.59 0.0031
2024-02-13 2023-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 571,113 12,904 35,323 0.0031
2023-11-15 2023-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 558,209 -8,606 -1.52 25,672 -21.19 0.0026
2023-08-14 2023-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 566,815 46,772 8.99 32,575 67.04 0.0032
2023-05-15 2023-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 520,043 -83,005 -13.76 19,502 15.41 0.0021
2023-02-14 2022-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 603,048 -107,336 -15.11 16,897 -15.35 0.0019
2022-11-14 2022-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 710,384 -116,407 -14.08 19,962 -30.60 0.0027
2022-10-27 2022-06-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 826,791 264,396 47.01 28,763 42.48 0.0037
2022-08-15 2022-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 826,791 264,396 28,763 0.0008
2022-10-27 2022-03-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 562,395 -56,347 -9.11 20,188 40.09 0.0027
2022-05-13 2022-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 562,395 -56,347 20,188 0.0027
2022-02-14 2021-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 618,742 101,307 19.58 14,411 46.50 0.0018
2021-11-15 2021-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 517,435 103,210 24.92 9,837 17.81 0.0013
2021-08-23 2021-06-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 414,225 72,625 21.26 8,350 33.43 0.0011
2021-08-16 2021-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 414,225 72,625 8,350 0.0002
2021-05-17 2021-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 341,600 9,692 2.92 6,258 -6.26 0.0009
2021-02-16 2020-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 331,908 235,070 242.75 6,676 267.62 0.0010
2020-11-13 2020-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 96,838 -25,443 -20.81 1,816 -33.87 0.0004
2020-08-14 2020-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 122,281 -112,338 -47.88 2,746 -21.14 0.0006
2020-05-26 2020-03-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 234,619 64,551 37.96 3,482 6.13 0.0009
2020-05-15 2020-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 234,619 64,551 3,482 267.4902
2020-02-14 2019-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 170,068 50,661 42.43 3,281 38.61 0.0008
2019-11-14 2019-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 119,407 -38,237 -24.26 2,367 -28.88 0.0006
2019-08-14 2019-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 157,644 -218,483 -58.09 3,328 -56.69 0.0009
2019-05-15 2019-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 376,127 170,112 82.57 7,684 87.41 0.0022
2019-02-14 2018-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 206,015 -27,849 -11.91 4,100 -8.87 0.0012
2019-04-23 2018-09-30 13F/A-2 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 233,864 50,144 27.29 4,499 60.45 0.0011
2018-11-20 2018-09-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 233,864 0 4,499 0.0011
2018-11-14 2018-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 233,864 50,144 4,499
2019-04-23 2018-06-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 183,720 -9,291 -4.81 2,804 -22.52 0.0008
2018-08-14 2018-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 183,720 -9,291 2,804
2019-04-23 2018-03-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 193,011 64,808 50.55 3,619 46.76 0.0010
2018-05-14 2018-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 193,011 64,808 3,619
2019-04-23 2017-12-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 128,203 74,625 139.28 2,466 157.68 0.0007
2018-02-14 2017-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 128,203 74,625 2,466
2017-11-14 2017-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 53,578 -65,886 -55.15 957 -55.13 0.0003
2017-08-11 2017-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 119,464 22,688 23.44 2,133 52.14 0.0006
2017-05-22 2017-03-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 96,776 -50,099 -34.11 1,402 -48.15 0.0004
2017-05-12 2017-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 96,776 1,402
2017-02-22 2016-12-31 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 146,875 -24,835 -14.46 2,704 -16.98 0.0009
2017-02-13 2016-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 146,875 2,704
2016-11-10 2016-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 171,710 123,916 259.27 3,257 322.99 0.0011
2016-08-12 2016-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 47,794 8,716 22.30 770 64.18 0.0003
2016-05-12 2016-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 39,078 -3,271 -7.72 469 -22.09 0.0002
2016-02-09 2015-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 42,349 39,519 1,396.43 602 1,670.59 0.0002
2016-02-08 2015-09-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 2,830 -8,593 -75.23 34 -83.08 0.0000
2015-11-09 2015-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 2,830 34
2015-08-12 2015-06-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 11,423 -70,392 -86.04 201 -83.58 0.0001
2015-05-14 2015-03-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 81,815 55,655 212.75 1,224 302.63 0.0005
2015-02-13 2014-12-31 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 26,160 -43,000 -62.17 304 -62.28 0.0001
2014-12-16 2014-09-30 13F/A-1 AMPHASTAR PHARMACEUTICALS IN COM 03209R103 69,160 69,160 806 0.0003
2014-11-14 2014-09-30 13F AMPHASTAR PHARMACEUTICALS IN COM 03209R103 69,160 806 0.0003
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.