AMPH short interest
Amphastar Pharmaceuticals · settlement of Oct 30, 2026
As of Oct 30, 2026, 4.3M AMPH shares were sold short, down 1.7% from the Oct 15, 2026 count. At the stock's average daily volume, that is 11 days to cover.
Amphastar Pharmaceuticals research · AMPH trades by Congress · Short interest movers · Most shorted stocks · Source
- Shares sold short
- 4.3M4,261,462
- Change
- −1.7%from 4.3M
- Of shares outstanding
- 9.99%#731 of 3,781 stocks measured
- Days to cover
- 11at the average daily volume
- Average daily volume
- 375,643shares, as FINRA reports it
- Most in 16 settlements
- 5.4MAug 14, 2026
Every settlement
16 settlements, newest first| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| Oct 30, 2026 | 4,261,462 | −1.7% | 375,643 | 11 |
| Oct 15, 2026 | 4,333,767 | −1.6% | 439,800 | 9.8 |
| Sep 30, 2026 | 4,405,038 | −11.8% | 620,832 | 7.1 |
| Sep 15, 2026 | 4,994,808 | −2.7% | 464,708 | 11 |
| Aug 31, 2026 | 5,134,473 | −4.7% | 334,222 | 15 |
| Aug 14, 2026 | 5,385,239 | +9.3% | 540,569 | 10.0 |
| Jul 31, 2026 | 4,928,331 | +18.1% | 414,646 | 12 |
| Jul 15, 2026 | 4,174,460 | +8.6% | 374,286 | 11 |
| Jun 30, 2026 | 3,845,576 | +1.2% | 734,234 | 5.2 |
| Jun 15, 2026 | 3,799,584 | +1.4% | 532,703 | 7.1 |
| May 29, 2026 | 3,747,543 | −0.9% | 792,627 | 4.7 |
| May 15, 2026 | 3,779,877 | +5.4% | 802,000 | 4.7 |
| Apr 30, 2026 | 3,585,957 | −8.1% | 411,556 | 8.7 |
| Apr 15, 2026 | 3,903,290 | +10.7% | 452,484 | 8.6 |
| Mar 31, 2026 | 3,527,477 | −5.6% | 526,830 | 6.7 |
| Mar 13, 2026 | 3,738,333 | — | 725,722 | 5.2 |
Source
Short interest is the number of shares sold short and not yet bought back. Brokers report it to FINRA for two settlement dates a month, the middle and the end, and FINRA publishes each count about a week later. It is not a daily figure: between settlements no one publishes a count. Days to cover is the short interest divided by the average daily volume FINRA reports beside it. A rising count is shown in red and a falling one in green.