1. Nature of Operations and Basis of Presentation

Packaging Corporation of America ("we," "us," "our," PCA," or the "Company") was incorporated on January 25, 1999. In April 1999, PCA acquired the containerboard and corrugated packaging products business of Pactiv Corporation ("Pactiv"), formerly known as Tenneco Packaging, Inc. We are a large diverse manufacturer of both packaging and paper products. We are headquartered in Lake Forest, Illinois and we operate primarily in the United States.

We report our business in three reportable segments: Packaging, Paper, and Corporate and Other. Our Packaging segment produces a wide variety of containerboard and corrugated packaging products. The Paper segment manufactures and sells a range of communication-based papers. Corporate and Other includes support staff services and related assets and liabilities, transportation assets, and activity related to other ancillary support operations. For more information about our segments, see Note 17, Segment Information.

On July 1, 2025, we announced our entry into a definitive agreement to purchase the containerboard business of Greif, Inc. (“Greif”) for $1.8 billion in cash (the “Greif Acquisition”). The transaction is expected to close by the end of the third quarter, subject to certain customary conditions, including regulatory approval. The Greif containerboard business includes two containerboard mills with approximately 800,000 tons of production capacity and eight sheet feeder and corrugated plants located across the United States. The operating results of the Greif Acquisition will be included in PCA’s results upon closing of the transaction.

The consolidated financial statements of PCA as of June 30, 2025 and for the three and six months ended June 30, 2025 and 2024 are unaudited but include all adjustments (consisting only of normal recurring adjustments) that management considers necessary for a fair presentation of such financial statements. The preparation of the consolidated financial statements involves the use of estimates and accruals. Actual results may vary from those estimates. These financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with Article 10 of Regulation S-X of the Securities and Exchange Commission (SEC). Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States for complete audited financial statements. Operating results for the three and six months ended June 30, 2025 are not necessarily indicative of the results that may be expected for the year ending December 31, 2025. These consolidated financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2024.

The consolidated financial statements include the accounts of PCA and its majority-owned subsidiaries after elimination of intercompany balances and transactions.