Packaging Corporation of America
US ˙ NYSE ˙ US6951561090

SecurityPKG / Packaging Corporation of America
InstitutionBoston Partners
Latest Disclosed Ownership1,566,890 shares
Latest Disclosed Value $ 332,491,988
Boston Partners reports 4.14% decrease in ownership of PKG / Packaging Corporation of America

On May 11, 2026 - Boston Partners filed a 13F-HR form disclosing ownership of 1,566,890 shares of Packaging Corporation of America (US:PKG) valued at $332,525,396 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,634,559 shares of Packaging Corporation of America. This represents a change in shares of -4.14% during the quarter. The current value of the position is $351,594,447 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-11 2026-03-31 13F PACKAGING CORP AMER COM 695156109 1,566,890 -67,669 -4.14 332,492 -1.38 0.1488
2026-02-13 2025-12-31 13F PACKAGING CORP AMER COM 695156109 1,634,559 -29,911 -1.80 337,149 -7.05 0.3491
2025-11-13 2025-09-30 13F PACKAGING CORP AMER COM 695156109 1,664,470 353,095 26.93 362,719 46.76 0.3724
2025-08-12 2025-06-30 13F/A-1 PACKAGING CORP AMER COM 695156109 1,311,375 -30,398 -2.27 247,147 -6.97 0.2745
2025-08-07 2025-06-30 13F PACKAGING CORP AMER COM 695156109 1,311,375 -30,398 247,147 0.1135
2025-05-13 2025-03-31 13F PACKAGING CORP AMER COM 695156109 1,341,773 -223,578 -14.28 265,658 -24.59 0.3213
2025-02-11 2024-12-31 13F PACKAGING CORP AMER COM 695156109 1,565,351 101,755 6.95 352,305 11.83 0.4285
2024-11-12 2024-09-30 13F PACKAGING CORP AMER COM 695156109 1,463,596 26,408 1.84 315,046 20.07 0.3718
2024-08-14 2024-06-30 13F PACKAGING CORP AMER COM 695156109 1,437,188 -9,115 -0.63 262,382 -4.39 0.3260
2024-05-28 2024-03-31 13F/A-1 PACKAGING CORP AMER COM 695156109 1,446,303 477,487 49.29 274,421 73.87 0.3269
2024-05-13 2024-03-31 13F PACKAGING CORP AMER COM 695156109 1,446,303 477,487 274,421 0.1358
2024-02-07 2023-12-31 13F PACKAGING CORP AMER COM 695156109 968,816 162,420 20.14 157,836 27.47 0.2090
2023-11-08 2023-09-30 13F PACKAGING CORP AMER COM 695156109 806,396 806,396 123,821 0.1714
2020-05-13 2020-03-31 13F PACKAGING CORP AMER COM 695156109 0 -30 -100.00 0 -100.00
2020-02-06 2019-12-31 13F/A-1 PACKAGING CORP AMER COM 695156109 30 0 0.00 3 0.00 0.0000
2020-02-05 2019-12-31 13F PACKAGING CORP AMER COM 695156109 30 0 3 1.6867
2019-11-20 2019-09-30 13F/A-1 PACKAGING CORP AMER COM 695156109 30 0 0.00 3 0.00 0.0000
2019-11-08 2019-09-30 13F PACKAGING CORP AMER COM 695156109 30 0 3 0.0000
2019-08-09 2019-06-30 13F PACKAGING CORP AMER COM 695156109 30 30 3 0.0000
2017-08-02 2017-06-30 13F PACKAGING CORP AMER COM 695156109 0 -35,245 -100.00 0 -100.00
2017-05-03 2017-03-31 13F PACKAGING CORP AMER COM 695156109 35,245 -220,048 -86.19 3,229 -85.09 0.0041
2017-02-06 2016-12-31 13F PACKAGING CORP AMER COM 695156109 255,293 -1,865,061 -87.96 21,654 -87.43 0.0285
2016-11-09 2016-09-30 13F PACKAGING CORP AMER COM 695156109 2,120,354 -358,156 -14.45 172,300 3.87 0.2409
2016-08-05 2016-06-30 13F PACKAGING CORP AMER COM 695156109 2,478,510 84,909 3.55 165,887 14.74 0.2397
2016-05-12 2016-03-31 13F PACKAGING CORP AMER COM 695156109 2,393,601 -165,528 -6.47 144,574 -10.40 0.2129
2016-02-08 2015-12-31 13F PACKAGING CORP AMER COM 695156109 2,559,129 409,846 19.07 161,353 24.79 0.2311
2015-11-10 2015-09-30 13F PACKAGING CORP AMER COM 695156109 2,149,283 536,692 33.28 129,301 28.31 0.1971
2015-08-10 2015-06-30 13F PACKAGING CORP AMER COM 695156109 1,612,591 -191,299 -10.60 100,771 -28.55 0.1448
2015-05-05 2015-03-31 13F PACKAGING CORP AMER COM 695156109 1,803,890 180,446 11.12 141,046 11.31 0.2100
2015-02-09 2014-12-31 13F PACKAGING CORP AMER COM 695156109 1,623,444 19,741 1.23 126,709 23.80 0.1902
2014-11-12 2014-09-30 13F PACKAGING CORP AMER COM 695156109 1,603,703 1,603,703 102,348 0.1661
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.