{
  "spec_version": "3",
  "endpoint": "timeline",
  "stock_code": "2281",
  "company_name": "プリマハム",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/2281/",
  "api_url": "/api/2281/timeline.json",
  "updated": "2026-08-23",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/2281/",
  "source": {
    "primary": [
      "有価証券報告書（沿革）"
    ],
    "extraction": "有価証券報告書の沿革を基礎に、社史・報道で補完",
    "row_field": "source"
  },
  "timeline": [
    {
      "date": "1931/9",
      "importance": 3,
      "event": "石川県金沢市で竹岸政則が竹岸ハム商会を創業し食肉の加工製造を開始",
      "source": null
    },
    {
      "date": "1948/7",
      "importance": 2,
      "event": "富山県高岡市に竹岸畜産工業を設立（資本金100万円）",
      "source": null
    },
    {
      "date": "1951/3",
      "importance": 1,
      "event": "旧大阪工場（大阪市大淀区）を開設",
      "source": null
    },
    {
      "date": "1957/10",
      "importance": 1,
      "event": "北海道工場（北海道上川郡清水町）を開設",
      "source": null
    },
    {
      "date": "1959/3",
      "importance": 1,
      "event": "旧東京工場（東京都品川区）を開設",
      "source": null
    },
    {
      "date": "1959/6",
      "importance": 1,
      "event": "本店を東京都千代田区大手町に移転",
      "source": null
    },
    {
      "date": "1960/4",
      "importance": 1,
      "event": "鹿児島工場（鹿児島県串木野市）を開設",
      "source": null
    },
    {
      "date": "1961/8",
      "importance": 1,
      "event": "秋田工場（秋田県本荘市）を開設",
      "source": null
    },
    {
      "date": "1961/10",
      "importance": 1,
      "event": "東京・大阪両証券取引所市場第二部に上場",
      "source": null
    },
    {
      "date": "1962/8",
      "importance": 1,
      "event": "東京・大阪両証券取引所市場第一部に上場",
      "source": null
    },
    {
      "date": "1964/9",
      "importance": 1,
      "event": "新東京工場（現茨城工場、茨城県土浦市）を開設",
      "source": null
    },
    {
      "date": "1965/5",
      "importance": 2,
      "event": "商号をプリマハムに変更",
      "source": null
    },
    {
      "date": "1969/4",
      "importance": 1,
      "event": "四国工場（愛媛県西条市）を開設",
      "source": null
    },
    {
      "date": "1971/3",
      "importance": 1,
      "event": "プリマファーム（現太平洋ブリーディング）を設立",
      "source": null
    },
    {
      "date": "1972/2",
      "importance": 3,
      "event": "米国オスカー・マイヤー社と資本並びに技術提携",
      "source": null
    },
    {
      "date": "1980/6",
      "importance": 1,
      "event": "三重工場（三重県阿山郡伊賀町）を開設",
      "source": null
    },
    {
      "date": "1986/10",
      "importance": 3,
      "event": "惣菜製造のプライムデリカを相模原市に設立",
      "source": null
    },
    {
      "date": "1987/3",
      "importance": 1,
      "event": "関東物流センター（茨城県土浦市）を開設",
      "source": null
    },
    {
      "date": "1989/9",
      "importance": 1,
      "event": "プリマ食品（埼玉県比企郡吉見町）を設立",
      "source": null
    },
    {
      "date": "2002/4",
      "importance": 2,
      "event": "秋田工場を閉鎖し秋田プリマ食品を設立",
      "source": null
    },
    {
      "date": "2002/7",
      "importance": 2,
      "event": "四国工場を閉鎖",
      "source": null
    },
    {
      "date": "2015/4",
      "importance": 1,
      "event": "食肉処理加工センター（鹿児島県いちき串木野市）を開設",
      "source": null
    },
    {
      "date": "2016/6",
      "importance": 1,
      "event": "茨城工場ウインナープラント（茨城県土浦市）を開設",
      "source": null
    },
    {
      "date": "2019/4",
      "importance": 1,
      "event": "茨城工場ハム・ベーコンプラント（茨城県土浦市）を開設",
      "source": null
    },
    {
      "date": "2022/4",
      "importance": 1,
      "event": "東京証券取引所プライム市場に移行",
      "source": null
    },
    {
      "date": "2023/1",
      "importance": 1,
      "event": "鹿児島新工場（鹿児島県いちき串木野市）を開設",
      "source": null
    }
  ]
}