DIMENSIONAL FUND ADVISORS LP
Position in AMPH — Amphastar Pharmaceuticals, Inc.
CIK 354204
AUSTIN, TX
Position in AMPH
as of Mar 31, 2026
· filed May 7, 2026
Position Value
$39,727,479
-$8,468,082 QoQ
Shares Held
2,027,947
+12.7% QoQ
Ownership
4.60%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
25 quarters on record
Voting authority
Sole 93.65925243608437.ToString("F0")%
Shared 3.5088195105690634.ToString("F0")%
None 2.831928053346562.ToString("F0")%
Common Shares in AMPH Over Time
Shares Held
Position Value (USD)
Position in Drug Manufacturers - Specialty & Generic
Healthcare · as of Mar 31, 2026DIMENSIONAL FUND ADVISORS LP holds $3,107,808,414 across 44 Drug Manufacturers - Specialty & Generic names. AMPH ranks #17 (1.3% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ELAN |
Elanco Animal Health Inc
|
24,527,135 | $586,934,337 | |
| 2 | VTRS |
Viatris Inc
|
38,310,693 | $517,577,461 | |
| 3 | ZTS |
Zoetis Inc.
|
2,771,447 | $327,612,748 | |
| 4 | UTHR |
UNITED THERAPEUTICS Corp
|
512,739 | $304,043,970 | |
| 5 | ALKS |
Alkermes plc.
|
4,522,378 | $159,911,284 | |
| 6 | PBH |
Prestige Consumer Healthcare Inc.
|
2,672,777 | $158,415,490 | |
| 7 | SUPN |
Supernus Pharmaceuticals, Inc.
|
2,307,030 | $119,250,378 | |
| 8 | LNTH |
Lantheus Holdings, Inc.
|
1,379,570 | $104,640,383 |
All Filings in AMPH
Export CSV
25 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $39,727,479 | 2,027,947 | Shares | Sole | 2026-05-07 | |
| 2025-12-31 | $48,195,561 | 1,799,685 | Shares | Sole | 2026-02-12 | |
| 2025-09-30 | $46,788,471 | 1,755,665 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $37,353,255 | 1,626,884 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $39,320,874 | 1,356,360 | Shares | Sole | 2025-05-13 | |
| 2024-12-31 | $44,503,645 | 1,198,590 | Shares | Defined | 2025-02-13 | |
| 2024-09-30 | $53,057,943 | 1,093,302 | Shares | Sole | 2024-11-07 | |
| 2024-06-30 | $42,811,000 | 1,070,275 | Shares | Sole | 2024-08-09 | |
| 2024-03-31 | $51,981,973 | 1,183,830 | Shares | Sole | 2024-05-10 | |
| 2023-12-31 | $82,825,931 | 1,339,142 | Shares | Sole | 2024-02-07 | |
| 2023-09-30 | $86,817,068 | 1,887,738 | Shares | Sole | 2023-11-09 | |
| 2023-06-30 | $110,952,442 | 1,930,615 | Shares | Sole | 2023-08-09 | |
| 2023-03-31 | $71,908,912 | 1,917,571 | Shares | Sole | 2023-05-12 | |
| 2022-12-31 | $52,300,560 | 1,866,544 | Shares | Sole | 2023-02-09 | |
| 2022-09-30 | $51,679,664 | 1,839,134 | Shares | Sole | 2022-11-10 | |
| 2022-06-30 | $63,528,034 | 1,826,043 | Shares | Sole | 2022-08-12 | |
| 2022-03-31 | $64,486,057 | 1,796,269 | Shares | Defined | 2022-05-13 | |
| 2021-12-31 | $41,243,119 | 1,770,851 | Shares | Defined | 2022-02-09 | |
| 2021-09-30 | $33,170,834 | 1,744,915 | Shares | Defined | 2021-11-12 | |
| 2021-06-30 | $34,189,202 | 1,695,893 | Shares | Defined | 2021-08-12 | |
| 2021-03-31 | $30,944,110 | 1,689,089 | Shares | Defined | 2021-05-14 | |
| 2020-12-31 | $36,346,512 | 1,807,385 | Shares | Defined | 2021-03-08 | |
| 2020-09-30 | $34,237,368 | 1,825,993 | Shares | Defined | 2020-11-12 | |
| 2020-06-30 | $41,389,782 | 1,842,822 | Shares | Defined | 2020-08-13 | |
| 2020-03-31 | $27,414,718 | 1,847,353 | Shares | Defined | 2020-05-14 | |
| No filing history on record for this holder in this stock. | ||||||