{
  "name": "Amphastar Pharmaceuticals, Inc.",
  "legal_name": "Amphastar Pharmaceuticals, Inc.",
  "ticker": "AMPH",
  "tickers": [
    "AMPH"
  ],
  "cik": "0001297184",
  "page_url": "https://steadybase.io/company/amphastar-pharmaceuticals-inc/",
  "markdown_url": "https://steadybase.io/company/amphastar-pharmaceuticals-inc.md",
  "json_url": "https://steadybase.io/company/amphastar-pharmaceuticals-inc.json",
  "as_of": "2026-11-10",
  "last_filed": "2026-11-05",
  "industry": {
    "sic": "2834",
    "description": "Pharmaceutical Preparations"
  },
  "headquarters": {
    "city": "Rancho Cucamonga",
    "state": "CA",
    "country": "US"
  },
  "exchanges": [
    "Nasdaq"
  ],
  "fiscal_year_end": "December 31",
  "filer_category": "Large accelerated filer",
  "state_of_incorporation": null,
  "website": "amphastar.com",
  "investor_relations_url": null,
  "linkedin_company_url": "https://www.linkedin.com/company/amphastar-pharmaceuticals-inc.",
  "summary": {
    "text": "We are a biopharmaceutical company focusing on developing, manufacturing, and commercializing technically challenging generic and proprietary injectable, inhalation, and intranasal products, as well as active pharmaceutical ingredient, or API products. We currently manufacture and sell over 25 prescription pharmaceutical products, and an over-the-counter product, Primatene MIST ® .",
    "section": "Item 1. Business",
    "period_end": "2025-12-31",
    "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000009/amph-20251231x10k.htm"
  },
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      "label": "Revenue",
      "value": 719887000,
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      "period_start": "2025-01-01",
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      "filed": "2026-02-26",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000009/0001297184-26-000009-index.html",
      "text": "Revenue: $719.9M for the fiscal year ended Dec 31, 2025 (10-K filed Feb 26, 2026)."
    },
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      "label": "Operating income",
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      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000009/0001297184-26-000009-index.html",
      "text": "Operating income: $140.4M for the fiscal year ended Dec 31, 2025 (10-K filed Feb 26, 2026)."
    },
    {
      "key": "net_income",
      "label": "Net income",
      "value": 98094000,
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      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000009/0001297184-26-000009-index.html",
      "text": "Net income: $98.1M for the fiscal year ended Dec 31, 2025 (10-K filed Feb 26, 2026)."
    },
    {
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      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000009/0001297184-26-000009-index.html",
      "text": "SG&A: $129.8M for the fiscal year ended Dec 31, 2025 (10-K filed Feb 26, 2026)."
    },
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      "text": "Employees: 1,976 as of Dec 31, 2025, as reported in an SEC filing."
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      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000053/0001297184-26-000053-index.html",
      "text": "Shares outstanding: 42,652,154 as of Oct 30, 2026 (10-Q filed Nov 5, 2026)."
    },
    {
      "key": "auditor",
      "label": "Auditor",
      "value": "Ernst & Young LLP",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000009/amph-20251231x10k.htm",
      "text": "Auditor: Ernst & Young LLP, Irvine, California, named in the latest 10-K."
    }
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      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000110465926027814/amph-20260312x8k.htm"
    },
    {
      "filed": "2026-03-06",
      "items": [
        {
          "item": "5.02",
          "label": "Departure or appointment of directors or officers; compensation",
          "signal": "leadership_change"
        },
        {
          "item": "9.01",
          "label": "Financial statements and exhibits",
          "signal": "exhibits"
        }
      ],
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000015/amph-20260303x8k.htm"
    },
    {
      "filed": "2026-03-06",
      "items": [
        {
          "item": "1.01",
          "label": "Entry into a material definitive agreement",
          "signal": "deal"
        },
        {
          "item": "9.01",
          "label": "Financial statements and exhibits",
          "signal": "exhibits"
        }
      ],
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000013/amph-20260303x8k.htm"
    },
    {
      "filed": "2026-02-26",
      "items": [
        {
          "item": "2.02",
          "label": "Results of operations and financial condition (earnings release)",
          "signal": "earnings"
        },
        {
          "item": "9.01",
          "label": "Financial statements and exhibits",
          "signal": "exhibits"
        }
      ],
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000007/amph-20260226x8k.htm"
    }
  ],
  "insider_trades": [
    {
      "owner": "William J. Peters",
      "role": "CFO, EVP & TREASURER",
      "action": "sold",
      "code": "S",
      "shares": 28631,
      "value_usd": 814669,
      "date": "2026-11-05",
      "filed": "2026-11-06",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000126313626000016/0001263136-26-000016-index.htm"
    },
    {
      "owner": "William J. Peters",
      "role": "CFO, EVP & TREASURER",
      "action": "sold",
      "code": "S",
      "shares": 4139,
      "value_usd": 103475,
      "date": "2026-09-21",
      "filed": "2026-09-23",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000126313626000014/0001263136-26-000014-index.htm"
    },
    {
      "owner": "Rong Zhou",
      "role": "SENIOR EVP, PRODUCTION CENTER",
      "action": "sold",
      "code": "S",
      "shares": 10000,
      "value_usd": 239400,
      "date": "2026-09-16",
      "filed": "2026-09-17",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000164532626000014/0001645326-26-000014-index.htm"
    },
    {
      "owner": "Rong Zhou",
      "role": "SENIOR EVP, PRODUCTION CENTER",
      "action": "sold",
      "code": "S",
      "shares": 3187,
      "value_usd": 75309,
      "date": "2026-09-02",
      "filed": "2026-09-03",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000164532626000012/0001645326-26-000012-index.htm"
    },
    {
      "owner": "Richard K. Prins",
      "role": "Director",
      "action": "sold",
      "code": "S",
      "shares": 7973,
      "value_usd": 161852,
      "date": "2026-08-11",
      "filed": "2026-08-12",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000104757926000005/0001047579-26-000005-index.htm"
    },
    {
      "owner": "William J. Peters",
      "role": "CFO, EVP & TREASURER",
      "action": "sold",
      "code": "S",
      "shares": 8180,
      "value_usd": 183886,
      "date": "2026-08-07",
      "filed": "2026-08-11",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000126313626000012/0001263136-26-000012-index.htm"
    },
    {
      "owner": "Rong Zhou",
      "role": "SENIOR EVP, PRODUCTION CENTER",
      "action": "sold",
      "code": "S",
      "shares": 9787,
      "value_usd": 256419,
      "date": "2025-12-17",
      "filed": "2025-12-18",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000164532625000004/0001645326-25-000004-index.htm"
    },
    {
      "owner": "Floyd F. Petersen",
      "role": "Director",
      "action": "sold",
      "code": "S",
      "shares": 4163,
      "value_usd": 107505,
      "date": "2025-12-12",
      "filed": "2025-12-15",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000161128625000011/0001611286-25-000011-index.htm"
    },
    {
      "owner": "Richard K. Prins",
      "role": "Director",
      "action": "sold",
      "code": "S",
      "shares": 4179,
      "value_usd": 113251,
      "date": "2025-11-25",
      "filed": "2025-11-25",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000104757925000006/0001047579-25-000006-index.htm"
    },
    {
      "owner": "Floyd F. Petersen",
      "role": "Director",
      "action": "sold",
      "code": "S",
      "shares": 16679,
      "value_usd": 441827,
      "date": "2025-11-13",
      "filed": "2025-11-17",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000161128625000009/0001611286-25-000009-index.htm"
    },
    {
      "owner": "Floyd F. Petersen",
      "role": "Director",
      "action": "sold",
      "code": "S",
      "shares": 500,
      "value_usd": 12635,
      "date": "2025-11-03",
      "filed": "2025-11-05",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000161128625000007/0001611286-25-000007-index.htm"
    },
    {
      "owner": "Floyd F. Petersen",
      "role": "Director",
      "action": "sold",
      "code": "S",
      "shares": 500,
      "value_usd": 13600,
      "date": "2025-10-01",
      "filed": "2025-10-02",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000161128625000005/0001611286-25-000005-index.htm"
    },
    {
      "owner": "Floyd F. Petersen",
      "role": "Director",
      "action": "sold",
      "code": "S",
      "shares": 500,
      "value_usd": 15490,
      "date": "2025-09-02",
      "filed": "2025-09-03",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000141588925023538/0001415889-25-023538-index.htm"
    },
    {
      "owner": "Floyd F. Petersen",
      "role": "Director",
      "action": "sold",
      "code": "S",
      "shares": 500,
      "value_usd": 10415,
      "date": "2025-08-01",
      "filed": "2025-08-04",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000141588925020987/0001415889-25-020987-index.htm"
    },
    {
      "owner": "Floyd F. Petersen",
      "role": "Director",
      "action": "sold",
      "code": "S",
      "shares": 500,
      "value_usd": 11735,
      "date": "2025-07-02",
      "filed": "2025-07-03",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000141588925019356/0001415889-25-019356-index.htm"
    }
  ],
  "quotes": [],
  "latest_filings": [
    {
      "form": "8-K",
      "filed": "2026-08-06",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000045/amph-20260806x8k.htm"
    },
    {
      "form": "10-K",
      "filed": "2026-02-26",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000009/amph-20251231x10k.htm"
    },
    {
      "form": "10-Q",
      "filed": "2026-08-06",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000047/amph-20260630x10q.htm"
    },
    {
      "form": "DEF 14A",
      "filed": "2026-04-13",
      "source_url": "https://www.sec.gov/Archives/edgar/data/1297184/000129718426000023/amph-20260601xdef14a.htm"
    }
  ],
  "source": "SEC EDGAR filings, read by Steadybase. Every value links to the filing it came from."
}