[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8},"actionData","errors","root",{"_96":97},"en-item",{"_9":10,"_10":11},"kind","item",{"_12":13,"_14":15,"_16":17,"_18":19,"_20":21,"_22":-5,"_23":24,"_25":26,"_27":28,"_29":30,"_31":30,"_32":33,"_34":35,"_36":37,"_38":39,"_40":41,"_42":43,"_44":45,"_46":-5,"_47":48,"_49":-5,"_50":-5,"_51":52,"_53":54,"_55":56,"_57":41,"_58":41,"_59":60,"_61":41,"_62":63},"id","r5c3z81muxwzfaazzryue3935","revision",2,"title","Packaging Corporation of America 提交 8-K，披露 2026 年第三季度业绩公告","originalTitle","8-K - PACKAGING CORP OF AMERICA (0000075677) (Filer)","summary","Packaging Corporation of America 于 10 月 21 日发布 2026 年第三季度财务业绩新闻稿，并通过 8-K 提交该公告。新闻稿作为附件 99.1 纳入披露；文件未列出具体财务数据。","reason","source",{"_12":87,"_88":89,"_9":90,"_91":41,"_92":93,"_94":95},"links",{"_84":85,"_77":86},"publishedAt","2026-10-21T22:07:41.000Z","discoveredAt","2026-10-22T10:12:14.854Z","timelineAt","category","ai-products","tags",[82,83],"stockSymbols",[81],"score",26,"selected",true,"channel","news","story",{"_72":73,"_16":74},"x","readingMode","full","author","language","body",{"_63":76,"_77":-5,"_78":79,"_80":41},"outline",[],"relatedStories",[75],"indexable","markdownAvailable","group",{"_64":65,"_44":66,"_67":68,"_69":70,"_71":70},"hasTranslation","bodyLanguage","zh","factId","fG8Kgdd_7oQc",{"_72":73,"_16":74},"reportCount",1,"additionalSourceCount",0,"developmentCount","publicId","48655836-e18e-448c-adeb-1f2ee8eafd6d","Packaging Corporation of America提交2026年第三季度业绩公告",{"_72":73,"_16":74},"

美国

证券交易委员会

华盛顿特区 20549

表格 8-K

\n \n \n \n \n \n \n \n \n \n \n \n

当前报告

依据《证券交易法》第 13 或 15(d) 条

（1934 年《证券交易法》）

报告日期（最早报告事件日期）：October 21, 2026

$\"img159781108_0.jpg\"$

（注册人章程中规定的准确名称）

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

特拉华州

1-15399

36-4277050

（注册成立所在州或其他司法管辖区
）

（委员会
档案编号）

（美国国税局雇主

识别号码）

1 North Field Court, Lake Forest, Illinois 60045

（主要执行办公室地址，包括邮政编码）

(847) 482-3000

（注册人的电话号码，包括区号）

如果 8-K 表格备案旨在同时满足注册人的以下任何备案义务，请勾选相应方框：

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

\n	\n
☐	根据《证券法》规则 425 进行的书面通信（17 CFR 230.425）
☐	根据《交易法》规则 14a-12 提交的征集材料（17 CFR 240.14a-12）
☐	根据《交易法》规则 14d-2 (b) 进行的启动前通信（17 CFR 240.14d-2 (b)）
☐	根据《交易法》规则 13e-4 (c) 进行的启动前通信（17 CFR 240.13e-4 (c)）

请勾选，说明注册人是否为《1933 年证券法》规则 405（本章 § 230.405）或《1934 年证券交易法》规则 12b-2（§ 240.12b-2）所定义的新兴成长型公司。

新兴成长型公司 ☐

如果是新兴成长型公司，请勾选，说明注册人是否已选择不使用《交易法》第 13(a) 条规定的延长过渡期，以遵守任何新的或修订后的财务会计准则。☐

根据《交易法》第 12(b) 条注册的证券：

\n \n \n \n \n \n \n \n \n \n \n \n \n

\n	\n	\n
各类别证券名称	交易代码	上市交易所名称
普通股	PKG	纽约证券交易所

第 2.02 项。\t经营业绩和财务状况。

本第 2.02 项所提供的信息（包括下文所述附件）不得视为依据经修订的《1934 年证券交易法》（“《交易法》”）第 18 条“提交”，也不得通过引用纳入根据经修订的《1933 年证券法》或《交易法》提交的任何文件，除非该文件明确以具体引用方式作出规定。

2026 年 10 月 21 日，Packaging Corporation of America 发布新闻稿，公布第三季度财务业绩。该新闻稿作为附件 99.1 提供，并通过引用纳入本第 2.02 项。

第 9.01 项。\t财务报表及附件。

(d)\t附件

\n \n \n \n \n \n \n \n \n \n \n \n \n

\n	\n	\n
99.1		2026 年第三季度业绩新闻稿，日期为 2026 年 10 月 21 日
104		封面交互式数据文件（嵌入 Inline XBRL 文档中）

签名

根据《1934年证券交易法》的要求，注册人已正式授权下列签署人代表其签署本报告。

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

\n	\n	\n	\n	\n
		PACKAGING CORPORATION OF AMERICA
				（注册人）

			签署人：	/s/ FABIAN C. STRAUSS
				财务高级副总裁、财务总监兼财务主管

日期：October 21, 2026

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