AMPH · Amphastar Pharmaceuticals, Inc.

$22.01 +0.13 (+0.59%) At close · Aug 28

S&P 600 member Russell 2000 member Rebalance outlook locked

Market Cap

$936.26M

42.54M

Daily short-sale volume published by FINRA from its trade-reporting facilities. It measures how many shares were sold short each day as a share of total volume — a daily flow, not the total outstanding short position.

1M 3M 6M 1Y 5Y All

Short Volume

Date	Short Volume	Short Exempt	Total Volume	Short %
2026-08-28	63,425	0	84,730	74.9%
2026-08-27	46,262	0	78,181	59.2%
2026-08-26	102,281	0	153,731	66.5%
2026-08-25	76,237	800	119,901	63.6%
2026-08-24	39,158	0	67,059	58.4%
2026-08-21	61,731	162	89,472	69.0%
2026-08-20	76,087	365	124,147	61.3%
2026-08-19	107,356	0	156,367	68.7%
2026-08-18	85,844	99	156,145	55.0%
2026-08-17	170,923	0	225,894	75.7%
2026-08-14	88,388	0	115,378	76.6%
2026-08-13	78,575	0	120,734	65.1%
2026-08-12	84,721	0	141,566	59.8%
2026-08-11	86,442	0	133,465	64.8%
2026-08-10	183,660	0	254,005	72.3%
2026-08-07	435,263	1,132	541,010	80.5%
2026-08-06	162,940	0	229,144	71.1%
2026-08-05	129,090	0	162,383	79.5%
2026-08-04	77,479	0	128,094	60.5%
2026-08-03	86,289	111	145,367	59.4%
2026-07-31	89,251	0	131,718	67.8%
2026-07-30	94,723	0	140,197	67.6%
2026-07-29	56,241	0	110,028	51.1%
2026-07-28	98,440	437	151,881	64.8%
2026-07-27	61,871	0	104,626	59.1%
2026-07-24	113,594	0	162,877	69.7%
2026-07-23	234,444	0	290,493	80.7%
2026-07-22	131,723	0	172,027	76.6%
2026-07-21	223,939	0	266,853	83.9%
2026-07-20	54,342	7,500	123,497	44.0%
2026-07-17	97,432	0	139,764	69.7%
2026-07-16	76,592	0	147,777	51.8%
2026-07-15	59,411	0	98,762	60.2%
2026-07-14	53,267	0	134,536	39.6%
2026-07-13	45,547	0	113,862	40.0%
2026-07-10	38,958	0	135,545	28.7%
2026-07-09	47,740	0	157,747	30.3%
2026-07-08	55,833	0	108,691	51.4%
2026-07-07	90,956	0	145,210	62.6%
2026-07-06	35,885	0	125,432	28.6%
2026-07-02	70,021	75	116,567	60.1%
2026-07-01	61,292	115	143,338	42.8%
2026-06-30	63,303	0	130,842	48.4%
2026-06-29	105,609	1,760	217,608	48.5%
2026-06-26	66,531	10	126,874	52.4%
2026-06-25	79,469	0	146,632	54.2%
2026-06-24	103,396	0	230,731	44.8%
2026-06-23	58,844	0	182,624	32.2%
2026-06-22	97,341	934	195,751	49.7%
2026-06-18	109,522	148	211,141	51.9%

Showing 1–50 of 63 days

Key facts CIK 1297184 CUSIP 03209R103 13F (30d) 169 filings 167 filers Visit website Investor relations