TWO SIGMA INVESTMENTS, LP
Position in AMPH — Amphastar Pharmaceuticals, Inc.
CIK 1179392
NEW YORK, NY
Position in AMPH
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$2,706,319
+$63,723 QoQ
Shares Held
138,148
+40.0% QoQ
Ownership
0.313%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Jun 2020
16 quarters on record
Voting authority
Sole 99.5656831803573.ToString("F0")%
Shared 0.ToString("F0")%
None 0.434316819642702.ToString("F0")%
Common Shares in AMPH Over Time
Shares Held
Position Value (USD)
Position in Drug Manufacturers - Specialty & Generic
Healthcare · as of Mar 31, 2026TWO SIGMA INVESTMENTS, LP holds $750,878,580 across 46 Drug Manufacturers - Specialty & Generic names. AMPH ranks #24 (0.4% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | NBIX |
Neurocrine Biosciences Inc
|
3,060,570 | $403,199,491 | |
| 2 | BCRX |
Biocryst Pharmaceuticals Inc
|
6,392,628 | $60,857,818 | |
| 3 | ALKS |
Alkermes plc.
|
780,683 | $27,604,950 | |
| 4 | ESPR |
Esperion Therapeutics, Inc.
|
9,458,779 | $25,917,054 | |
| 5 | LQDA |
Liquidia Corp
|
563,233 | $21,256,413 | |
| 6 | IRWD |
Ironwood Pharmaceuticals Inc
|
5,848,276 | $20,527,448 | |
| 7 | KNSA |
Kiniksa Pharmaceuticals International, plc
|
420,914 | $20,267,009 | |
| 8 | COLL |
Collegium Pharmaceutical, Inc
|
590,116 | $19,515,136 |
All Filings in AMPH
Export CSV
16 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $2,706,319 | 138,148 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $2,642,596 | 98,678 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $2,629,768 | 98,678 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $1,839,784 | 80,130 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $2,183,758 | 75,328 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $3,645,571 | 98,184 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $4,794,666 | 98,798 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $3,857,200 | 96,430 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $4,250,663 | 96,804 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $2,583,783 | 41,775 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $4,391,309 | 95,484 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $1,724,674 | 30,010 | Shares | Sole | 2023-08-14 | |
| 2022-06-30 | $737,548 | 21,200 | Shares | Sole | 2022-08-15 | |
| 2021-03-31 | $1,619,030 | 88,375 | Shares | Sole | 2021-05-17 | |
| 2020-09-30 | $3,543,937 | 189,010 | Shares | Sole | 2020-11-16 | |
| 2020-06-30 | $1,199,588 | 53,410 | Shares | Sole | 2020-08-14 | |
| No filing history on record for this holder in this stock. | ||||||