Amphastar Pharmaceuticals, Inc. - Common Stock (AMPH)
CUSIP: 03209R103
Q4 2025 13F Holders as of 31 Dec 2025
- Type / Class
- Equity / Common Stock
- Shares outstanding
- 46,377,939
- Total 13F shares
- 33,557,586
- Share change
- +933,080
- Total reported value
- $898,632,046
- Put/Call ratio
- 0%
- Price per share
- $26.78
- Number of holders
- 232
- Value change
- +$25,047,300
- Number of buys
- 115
- Number of sells
- 118
Quarterly Holders Quick Answers
What is CUSIP 03209R103?
CUSIP 03209R103 identifies AMPH - Amphastar Pharmaceuticals, Inc. - Common Stock in SEC institutional holdings data.
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Recent filing periods for CUSIP 03209R103:
Top shareholders of AMPH - Amphastar Pharmaceuticals, Inc. - Common Stock (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| Jack Y. Zhang |
13D/G
|
— |
25%
|
12,524,153
|
$301,456,363 | $0 | 31 Dec 2024 | |
| BlackRock, Inc. |
13F
13D/G
|
Company |
12%
from 13D/G
|
5,485,057
|
$146,176,770 | — | 30 Sep 2025 | |
| VANGUARD GROUP INC |
13F
|
Company |
5.7%
|
2,631,040
|
$70,117,216 | — | 30 Sep 2025 | |
| Mary Z. Luo |
3/4/5
|
COO,Chief Scientist & Chairman, Director, 10%+ Owner |
—
class O/S missing
|
1,109,416
|
$63,239,930 | — | 10 Jan 2024 | |
| TD ASSET MANAGEMENT INC |
13F
|
Company |
4.2%
|
1,931,892
|
$51,484,922 | — | 30 Sep 2025 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
3.8%
|
1,755,665
|
$46,789,114 | — | 30 Sep 2025 | |
| STATE STREET CORP |
13F
|
Company |
3.2%
|
1,500,742
|
$39,994,774 | — | 30 Sep 2025 | |
| FULLER & THALER ASSET MANAGEMENT, INC. |
13F
|
Company |
2.9%
|
1,353,927
|
$36,082,167 | — | 30 Sep 2025 | |
| Boston Trust Walden Corp |
13F
|
Company |
2.5%
|
1,173,107
|
$31,263,302 | — | 30 Sep 2025 | |
| Epoch Investment Partners, Inc. |
13F
|
Company |
2.4%
|
1,133,986
|
$30,220,727 | — | 30 Sep 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
2%
|
922,577
|
$24,590,067 | — | 30 Sep 2025 | |
| MARSHALL WACE, LLP |
13F
|
Company |
1.9%
|
874,068
|
$23,293,911 | — | 30 Sep 2025 | |
| MILLENNIUM MANAGEMENT LLC |
13F
|
Company |
1.5%
|
697,765
|
$18,595,437 | — | 30 Sep 2025 | |
| RENAISSANCE TECHNOLOGIES LLC |
13F
|
Company |
1.3%
|
586,900
|
$15,640,885 | — | 30 Sep 2025 | |
| Richard Koo |
3/4/5
|
Director |
—
mixed-class rows
|
286,471
mixed-class rows
|
$15,350,254 | — | 07 Jun 2021 | |
| MORGAN STANLEY |
13F
|
Company |
1.2%
|
574,679
|
$15,315,209 | — | 30 Sep 2025 | |
| D. E. Shaw & Co., Inc. |
13F
|
Company |
1.1%
|
517,222
|
$13,783,966 | — | 30 Sep 2025 | |
| SYSTEMATIC FINANCIAL MANAGEMENT LP |
13F
|
Company |
0.91%
|
423,112
|
$11,275,974 | — | 30 Sep 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.86%
|
399,470
|
$10,645,876 | — | 30 Sep 2025 | |
| ALGERT GLOBAL LLC |
13F
|
Company |
0.85%
|
392,902
|
$10,471,000 | — | 30 Sep 2025 | |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP |
13F
|
Company |
0.85%
|
392,310
|
$10,455,062 | — | 30 Sep 2025 | |
| Invesco Ltd. |
13F
|
Company |
0.84%
|
389,593
|
$10,382,654 | — | 30 Sep 2025 | |
| ROYCE & ASSOCIATES LP |
13F
|
Company |
0.79%
|
366,322
|
$9,762,481 | — | 30 Sep 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
0.77%
|
356,409
|
$9,498,300 | — | 30 Sep 2025 | |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC |
13F
|
Company |
0.7%
|
326,183
|
$8,692,777 | — | 30 Sep 2025 | |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC |
13F
|
Company |
0.67%
|
312,337
|
$8,323,781 | — | 30 Sep 2025 | |
| UBS Group AG |
13F
|
Company |
0.67%
|
312,274
|
$8,322,102 | — | 30 Sep 2025 | |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC |
13F
|
Company |
0.63%
|
292,443
|
$7,793,606 | — | 30 Sep 2025 | |
| AMERICAN CENTURY COMPANIES INC |
13F
|
Company |
0.62%
|
288,585
|
$7,690,790 | — | 30 Sep 2025 | |
| Clark Capital Management Group, Inc. |
13F
|
Company |
0.61%
|
283,674
|
$7,559,912 | — | 30 Sep 2025 | |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13F
|
Company |
0.59%
|
275,222
|
$7,336,000 | — | 30 Sep 2025 | |
| Bank of New York Mellon Corp |
13F
|
Company |
0.58%
|
267,828
|
$7,137,617 | — | 30 Sep 2025 | |
| JPMORGAN CHASE & CO |
13F
|
Company |
0.55%
|
253,232
|
$6,748,633 | — | 30 Sep 2025 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
0.52%
|
241,228
|
$6,428,726 | — | 30 Sep 2025 | |
| Qube Research & Technologies Ltd |
13F
|
Company |
0.52%
|
241,212
|
$6,428,300 | — | 30 Sep 2025 | |
| CITADEL ADVISORS LLC |
13F
|
Company |
0.49%
|
226,775
|
$6,043,554 | — | 30 Sep 2025 | |
| BNP PARIBAS FINANCIAL MARKETS |
13F
|
Company |
0.48%
|
222,019
|
$5,916,806 | — | 30 Sep 2025 | |
| VICTORY CAPITAL MANAGEMENT INC |
13F
|
Company |
0.46%
|
211,800
|
$5,644,471 | — | 30 Sep 2025 | |
| PRINCIPAL FINANCIAL GROUP INC |
13F
|
Company |
0.44%
|
205,678
|
$5,481,318 | — | 30 Sep 2025 | |
| NORDEA INVESTMENT MANAGEMENT AB |
13F
|
Company |
0.33%
|
153,351
|
$4,091,405 | — | 30 Sep 2025 | |
| FIRST TRUST ADVISORS LP |
13F
|
Company |
0.32%
|
150,422
|
$4,008,746 | — | 30 Sep 2025 | |
| Empowered Funds, LLC |
13F
|
Company |
0.32%
|
149,795
|
$3,992,037 | — | 30 Sep 2025 | |
| JANE STREET GROUP, LLC |
13F
|
Company |
0.32%
|
148,459
|
$3,956,432 | — | 30 Sep 2025 | |
| Howard Lee |
3/4/5
|
Director |
—
mixed-class rows
|
163,378
mixed-class rows
|
$3,952,895 | — | 02 Jun 2025 | |
| BALYASNY ASSET MANAGEMENT L.P. |
13F
|
Company |
0.31%
|
141,852
|
$3,780,356 | — | 30 Sep 2025 | |
| PUBLIC SECTOR PENSION INVESTMENT BOARD |
13F
|
Company |
0.3%
|
139,675
|
$3,722,339 | — | 30 Sep 2025 | |
| Bridge City Capital, LLC |
13F
|
Company |
0.29%
|
136,258
|
$3,631,276 | — | 30 Sep 2025 | |
| DENALI ADVISORS LLC |
13F
|
Company |
0.29%
|
135,000
|
$3,597,750 | — | 30 Sep 2025 | |
| LAM GROUP, INC. |
13F
|
Company |
0.28%
|
130,800
|
$3,485,820 | — | 30 Sep 2025 | |
| AMERIPRISE FINANCIAL INC |
13F
|
Company |
0.28%
|
129,841
|
$3,460,263 | — | 30 Sep 2025 |
Institutional Holders of Amphastar Pharmaceuticals, Inc. - Common Stock (AMPH) as of Q4 2025
As of 31 Dec 2025,
Amphastar Pharmaceuticals, Inc. - Common Stock (AMPH) was held by
232 institutional
shareholders
that filed Form 13F with the SEC.
Together, they reported ownership of
33,557,586 shares.
The largest 10 holders included
BlackRock, Inc., VANGUARD GROUP INC, TD Asset Management Inc, DIMENSIONAL FUND ADVISORS LP, STATE STREET CORP, FULLER & THALER ASSET MANAGEMENT, INC., MARSHALL WACE, LLP, Epoch Investment Partners, Inc., Boston Trust Walden Corp, and GEODE CAPITAL MANAGEMENT, LLC.
This page lists
232
institutional shareholders reporting positions in this security
for the Q4 2025 filing period.
| Investor | Option | Weight % | Change % | Value $ | * Price | Shares | Share Change | Activity | Report Period |
|---|
Compare Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
240
Q4 2025 holders
232
Holder diff
-8
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 Value $ | Q4 2025 Value $ | Value Diff $ | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend
* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.
An asterisk sign (*) next to the price indicates that the price is likely invalid.