Amphastar Pharmaceuticals, Inc. is +2.5% over the past year while the S&P 500 is +16%: 14 points behind the market. 1-year return: +2.5% (S&P 500 +16%). vs 200-day average: +13%, a clear uptrend. RSI (14): 48, neutral. Below its 52-week high: 15%.

AMPHAmphastar Pharmaceuticals, Inc.

Healthcare

$25.14+2.5% 1Y

$25.14

$16.8752 weeks$29.40

What is the market doing?

Mixed

No clear lean: in an uptrend, but heavily shorted (+10% of shares).

1 good, 1 to watch, 1 without data

TrendUptrendderived · Oct 23, 2026

In an uptrend, above its rising 50- and 200-day averages. Price is +13% vs its 200-day average.

Short interest10% of sharesFINRA · Sep 30, 2026

Heavily shorted, settled Sep 30, 2026, more than a week of normal trading to cover, a crowded exit.

Where this answer is blind. Insider selling is often routine (taxes, diversification); only cluster buying is a strong tell.

How AMPH is trading

Amphastar Pharmaceuticals, Inc. is +2.5% over the past year while the S&P 500 is +16%: 14 points behind the market.

+2.5%

1-year return · S&P 500 +16%

vs 200-day average: +13%
vs 200-day average · a clear uptrend
RSI (14): 48
RSI (14) · neutral
Below its 52-week high: 15%
Below its 52-week high

Oct 21, 2024$16.87 – $53.40 · dashed line: 200-day averageOct 23, 2026

Details›

Last close2026-10-23: $25.14
1 monthS&P 500 −0.94%: −4.2%
1 yearS&P 500 +16%: +2.5%
5 yearsS&P 500 +86%: +32%
vs 50-day average$24.26: +3.6%
52-week high: $29.40
52-week low: $16.87
Annualised volatility: 47%

Calendar-year price return
Year	Return
2026 (year to date)	−6.1%
2025	−28%
2024	−40%
2023	+121%
2022	+20%
2021	+16%
2020	+4.3%
2019	−3.1%
2018	+3.4%
2017	+4.5%

Average return by calendar month, 2016–2026
Month	Years	Positive	Average
Jan	10	2 of 10	−2.9%
Feb	10	3 of 10	−4.6%
Mar	10	5 of 10	+1.9%
Apr	10	5 of 10	+0.53%
May	10	7 of 10	+2.6%
Jun	10	6 of 10	+5.2%
Jul	11	6 of 11	+1.1%
Aug	11	7 of 11	+5.8%
Sep	11	3 of 11	−2.5%
Oct	11	4 of 11	−0.37%
Nov	10	7 of 10	+5.5%
Dec	10	3 of 10	−0.44%