Amphastar Pharmaceuticals, Inc. (AMPH)

Typically moves ±8.23% on earnings

EARNINGS ANALYTICS

event_note Approx. Next Earnings: ~2026-11-06 APPROXIMATE

Since Aug 12, 2014, Amphastar Pharmaceuticals, Inc. (AMPH) has reported earnings 49 times. On average the shares move ±8.23% post-earnings, with a positive reaction 53.1% 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 2026-11-06 (approximate).

Earnings reactions

How AMPH moved on each past earnings report.

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Earnings Impact

Total Earnings

Avg Abs. Movement

±8.23%

Positive %

53.1%

Negative %

46.9%

Historical Earnings Statistics

Date	Timing	Earnings move	SEC Filing
Aug 06, 2026	☽ POST	+4.85%	open_in_new
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

±8.23%

Avg % price change on earnings

description

SEC Filings

View

Browse all SEC filings

account_balance

Institutional ownership

Holdings as of Jun 30, 2026 · SEC 13-F

View all 2 →

Funds holding

$229851

Total value held

Buying

2 added · 0 reduced

Allstate Corp

$229104 NEW BUY

Zions Bancorporation, National Association /Ut/

$747 NEW BUY

SEC Filing Types

Recent SEC Filings

10 most recent

Form	Date Filed	View on EDGAR
4	20260903	open_in_new SEC.gov
144	20260901	open_in_new SEC.gov
144	20260818	open_in_new SEC.gov
4	20260812	open_in_new SEC.gov
144	20260811	open_in_new SEC.gov
4	20260811	open_in_new SEC.gov
144	20260807	open_in_new SEC.gov
10-Q	20260806	open_in_new SEC.gov
8-K	20260806	open_in_new SEC.gov
SCHEDULE 13G	20260714	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 2026-11-06. 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 49 reports, AMPH has moved an average of ±8.23% the session after earnings, closing higher 53.1% 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.