Item 5.07. Submission of Matters to a Vote of Security Holders

On May 2, 2023, Packaging Corporation of America ("PCA") held its 2023 Annual Meeting of Stockholders, at which the following proposals were voted upon and approved by PCA's stockholders:

(a) Election of Directors. Voting results are summarized as follows:



                                          Votes                             Broker
Nominee                Votes For         Against         Abstentions       Non-Vote
Cheryl K. Beebe         66,786,534        9,598,850            57,755       4,374,117
Duane C. Farrington     75,883,582          499,191            60,366       4,374,117
Donna A. Harman         75,867,680          519,226            56,233       4,374,117
Mark W. Kowlzan         68,696,382        7,687,193            59,564       4,374,117
Robert C. Lyons         73,344,365        3,036,959            61,815       4,374,117
Thomas P. Maurer        75,871,098          512,332            59,709       4,374,117
Samuel M. Mencoff       63,587,134       12,797,627            58,378       4,374,117
Roger B. Porter         59,938,932       16,443,299            60,908       4,374,117
Thomas S. Souleles      70,197,222        6,184,622            61,295       4,374,117
Paul T. Stecko          71,064,025        5,324,168            54,946       4,374,117

(b) Ratification of Independent Registered Public Accounting Firm. The audit committee's appointment of KPMG LLP as PCA's independent registered public accounting firm was ratified by the following vote: 79,104,653 votes for, 1,660,315 votes against, and 52,288 abstentions.

(c) Approval of PCA's Executive Compensation. 72,343,447 votes for, 3,968,815 votes against, 130,878 abstentions and 4,374,117 broker non-votes.

(d) Frequency of Vote on Executive Compensation. 74,831,036 for one year; 78,781 for two years; 1,436,641 for three years, 96,681 abstentions; and 4,374,117 broker non-votes. PCA will continue to hold votes on its executive compensation every year until the next time stockholders vote on the frequency of the vote on executive compensation.

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