Shareholder Vote

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 15, 2018 Packaging Corporation of America (Exact name of registrant as specified in its charter) Delaware 1-15399 36-4277050 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) 1955 West Field Court, Lake Forest, Illinois 60045 (Address of Principal Executive Offices, including Zip Code) (847) 482-3000 (Registrant’s Telephone Number, Including Area Code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2 (b) under the Exchange Act (17 CFR 240.14d-2 (b)) ☐ Pre-commencement communications pursuant to Rule 13e-4 (c) under the Exchange Act (17 CFR 240.13e-4 (c)) Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ Item 5.07. Submission of Matters to a Vote of Security Holders On May 15, 2018, Packaging Corporation of America held its 2018 Annual Meeting of Stockholders, at which the following proposals were voted upon and approved by PCA’s stockholders: (a) Election of Directors. Each of the following nominees for directors was elected to serve through the 2019 Annual Meeting of Stockholders. Votes for, votes against, abstentions and broker non-votes, by nominee, were as follows: Nominee For Against Abstain Broker Non-Vote Mark W. Kowlzan 74,224,340 3,478,778 1,364,105 6,467,299 Cheryl K. Beebe 77,711,372 1,274,131 81,720 6,467,299 Duane C. Farrington 78,805,874 166,214 95,135 6,467,299 Hasan Jameel 77,599,105 1,377,521 90,597 6,467,299 Robert C. Lyons 78,816,973 163,255 86,995 6,467,299 Thomas P. Maurer 78,806,592 173,493 87,138 6,467,299 Samuel M. Mencoff 74,842,017 4,178,840 46,366 6,467,299 Roger B. Porter 72,176,347 6,518,605 372,271 6,467,299 Thomas S. Souleles 77,818,869 1,160,767 87,587 6,467,299 Paul T. Stecko 76,961,307 2,068,630 37,286 6,467,299 James D. Woodrum 78,058,493 917,564 91,166 6,467,299 (b) The stockholders ratified the audit committee’s appointment of KPMG LLP as the independent registered public accounting firm to serve as PCA’s auditors for the year ending December 31, 2018. The voting results were as follows: 85,421,608 votes for; 52,598 votes against; and 59,956 abstentions. (c) The stockholders approved our executive compensation on a non-binding advisory basis. The voting results were as follows: 74,286,972 votes for; 4,478,440 votes against; 301,811 abstentions; and 6,467,299 broker non-votes. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. PACKAGING CORPORATION OF AMERICA By: /s/ Kent A. Pflederer Senior Vice President, General Counsel & Secretary Date: May 16, 2018