Amphastar Pharmaceuticals, Inc. (AMPH)

Typically moves ±8.30% on earnings

EARNINGS ANALYTICS

event_note Approx. Next Earnings: ~2026-08-07 APPROXIMATE

Since Aug 12, 2014, Amphastar Pharmaceuticals, Inc. (AMPH) has reported earnings 48 times. On average the shares move ±8.30% post-earnings, with a positive reaction 52.1% of the time. Its largest post-earnings gain was +16.34% (Nov 08, 2016) and its largest decline was -24.7% (May 09, 2018). The next earnings report is predicted for 2026-08-07 (approximate).

Earnings reactions

How AMPH moved on each past earnings report.

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Earnings Impact

Total Earnings

Avg Abs. Movement

±8.30%

Positive %

52.1%

Negative %

47.9%

Historical Earnings Statistics

Date	Timing	Earnings move	SEC Filing
May 07, 2026	☽ POST	-20.71%	open_in_new
Feb 26, 2026	☽ POST	-23.63%	open_in_new
Nov 06, 2025	☽ POST	-0.83%	open_in_new
Aug 07, 2025	☽ POST	+10.13%	open_in_new
May 07, 2025	☽ POST	+0.9%	open_in_new
Feb 27, 2025	☽ POST	-9.72%	open_in_new
Nov 06, 2024	☽ POST	-13.69%	open_in_new
Aug 07, 2024	☽ POST	+13.29%	open_in_new
May 08, 2024	☽ POST	+0.52%	open_in_new
Feb 28, 2024	☽ POST	-14.93%	open_in_new
Nov 08, 2023	☽ POST	+15.39%	open_in_new
Aug 08, 2023	☽ POST	-4.29%	open_in_new
May 09, 2023	☽ POST	+13.04%	open_in_new
Feb 28, 2023	☽ POST	+14.75%	open_in_new
Nov 07, 2022	☽ POST	-9.37%	open_in_new
Aug 08, 2022	☽ POST	-15.07%	open_in_new
May 09, 2022	☽ POST	+7.05%	open_in_new
Mar 10, 2022	☽ POST	+12.57%	open_in_new
Nov 08, 2021	☽ POST	+4.06%	open_in_new
Aug 09, 2021	☽ POST	+1.2%	open_in_new
May 06, 2021	☽ POST	+3.49%	open_in_new
Mar 15, 2021	☽ POST	-3.71%	open_in_new
Nov 06, 2020	☀ PRE	-6.93%	open_in_new
Aug 06, 2020	☽ POST	-0.64%	open_in_new
May 07, 2020	☽ POST	+6.76%	open_in_new
Mar 12, 2020	☽ POST	+2.31%	open_in_new
Nov 07, 2019	☽ POST	-3.71%	open_in_new
Aug 07, 2019	☽ POST	+7.01%	open_in_new
May 09, 2019	☽ POST	-0.97%	open_in_new
Mar 12, 2019	☽ POST	-14.44%	open_in_new
Nov 08, 2018	☽ POST	+4.25%	open_in_new
Aug 08, 2018	☽ POST	-4.4%	open_in_new
May 09, 2018	☽ POST	-24.7%	open_in_new
Mar 12, 2018	☽ POST	+3.93%	open_in_new
Nov 08, 2017	☽ POST	+5.61%	open_in_new
Aug 09, 2017	☽ POST	-1.74%	open_in_new
May 08, 2017	☽ POST	-1.41%	open_in_new
Mar 13, 2017	☽ POST	-17.23%	open_in_new
Nov 08, 2016	☽ POST	+16.34%	open_in_new
Aug 08, 2016	☽ POST	+12.05%	open_in_new
May 09, 2016	☽ POST	+9.62%	open_in_new
Mar 14, 2016	☽ POST	+8.63%	open_in_new
Nov 12, 2015	☽ POST	+13.38%	open_in_new
Aug 12, 2015	☽ POST	-1.97%	open_in_new
May 13, 2015	☀ PRE	+5.63%	open_in_new
Mar 24, 2015	☽ POST	-5.94%	open_in_new
Nov 12, 2014	☽ POST	+5.77%	open_in_new
Aug 12, 2014	☽ POST	-0.49%	open_in_new

event

Earnings Count

Total earnings in dataset

trending_up

Avg Abs. Movement

±8.30%

Avg % price change on earnings

description

SEC Filings

View

Browse all SEC filings

SEC Filing Types

Recent SEC Filings

10 most recent

Form	Date Filed	View on EDGAR
SCHEDULE 13G	20260714	open_in_new SEC.gov
3	20260713	open_in_new SEC.gov
4	20260713	open_in_new SEC.gov
8-K	20260713	open_in_new SEC.gov
8-K	20260708	open_in_new SEC.gov
4	20260603	open_in_new SEC.gov
4	20260603	open_in_new SEC.gov
4	20260603	open_in_new SEC.gov
4	20260603	open_in_new SEC.gov
4	20260603	open_in_new SEC.gov

Frequently asked about AMPH earnings

When does Amphastar Pharmaceuticals, Inc. report earnings next? expand_more

Amphastar Pharmaceuticals, Inc. (AMPH)'s next earnings date is approximate for 2026-08-07. This is a prediction based on its historical quarterly reporting pattern, not a company-confirmed date.

How much does AMPH stock move after earnings? expand_more

Over 48 reports, AMPH has moved an average of ±8.30% the session after earnings, closing higher 52.1% of the time.

What was AMPH's biggest post-earnings move? expand_more

AMPH's largest post-earnings gain on record was +16.34% on Nov 08, 2016, and its largest decline was -24.7% on May 09, 2018.

Where can I find Amphastar Pharmaceuticals, Inc.'s SEC filings? expand_more

All of Amphastar Pharmaceuticals, Inc.'s SEC filings — 10-K, 10-Q, 8-K and more — are listed in the SEC filings section on this page, each linking to the original document on SEC.gov.