Packaging Corp (NYSE: PKG) CEO Kowlzan sells 9,266 shares, holds 473,610

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Packaging Corp of America Chairman & CEO Mark W. Kowlzan sold shares of company stock. He completed an open‑market sale of 9,266 shares of common stock at a weighted average price of $217.0760 per share, leaving him with 473,610 directly held shares.

The filing also reports indirect holdings of 20,503 shares in a 401k plan and 2,565 shares held by his spouse, for which he disclaims beneficial ownership. The price disclosed is a weighted average; detailed trade prices within the range are available on request.

Insider Trade Summary

Net Seller: 9,266 shares ($2,011,426)

Net Sell 3 txns

Insider KOWLZAN MARK W

Role Chairman & CEO

Sold 9,266 shs ($2.01M)

Type	Security	Shares	Price	Value
Sale	Common Stock	9,266	$217.076	$2.01M
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 473,610 shares (Direct, null); Common Stock — 20,503 shares (Indirect, 401k plan)

Footnotes (1)

The price listed is the weighted average sale price. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request. Reporting person disclaims beneficial ownership of shares held by spouse.

Key Figures

Shares sold: 9,266 shares Weighted average sale price: $217.0760 per share Direct holdings after sale: 473,610 shares +2 more

5 metrics

Shares sold 9,266 shares Open-market sale of common stock

Weighted average sale price $217.0760 per share Price for 9,266 shares sold

Direct holdings after sale 473,610 shares Common stock held directly by CEO

401k plan holdings 20,503 shares Indirect ownership via 401k plan

Spouse-held shares 2,565 shares Indirect, beneficial ownership disclaimed

Key Terms

weighted average sale price, beneficial ownership, 401k plan

3 terms

weighted average sale price financial

"The price listed is the weighted average sale price."

beneficial ownership financial

"Reporting person disclaims beneficial ownership of shares held by spouse."

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

401k plan financial

"nature_of_ownership: 401k plan"

A 401(k) plan is an employer-sponsored retirement savings account that lets workers set aside part of their paycheck into investments, often with tax breaks and sometimes with matching contributions from the employer. Think of it as a workplace piggy bank that grows through employee contributions, optional company top-ups, and market returns; it matters to investors because it shapes household retirement security, drives large flows of money into public markets, and affects a company’s compensation costs and ability to attract and keep talent.

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Form 4 Insider Transactions: What Each Field Means →

05/28/2026 - 05:50 PM

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

KOWLZAN MARK W

(Last)

(First)

(Middle)

1 N. FIELD COURT

(Street)

LAKE FOREST

ILLINOIS

60045

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
PACKAGING CORP OF AMERICA [ PKG ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chairman & CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/27/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/27/2026		S		9,266	D	$217.076⁽¹⁾	473,610	D
Common Stock								20,503	I	401k plan
Common Stock								2,565	I	by spouse⁽²⁾

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. The price listed is the weighted average sale price. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request.

2. Reporting person disclaims beneficial ownership of shares held by spouse.

	Kent A. Pflederer, attorney in fact	05/28/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did PKG CEO Mark W. Kowlzan report on this Form 4?

Mark W. Kowlzan reported selling 9,266 shares of Packaging Corp of America common stock. The transaction was an open‑market sale at a weighted average price of $217.0760 per share, and it left him with 473,610 shares held directly after the sale.

How many PKG shares does Mark W. Kowlzan hold after the reported sale?

After the reported transaction, Mark W. Kowlzan holds 473,610 shares of Packaging Corp of America directly. The filing also lists 20,503 shares in a 401k plan and 2,565 shares held by his spouse, though he disclaims beneficial ownership of the spouse‑held shares.

What price did the PKG CEO receive for the shares sold in this Form 4?

The reported sale used a weighted average price of $217.0760 per share for the 9,266 shares sold. The filing notes that full information on the number of shares sold at each individual price level is available from the reporting person upon request.

Does the PKG Form 4 show any derivative or option exercises by the CEO?

This Form 4 shows only a sale of common stock and related holdings, with no derivative or option exercises reported. The derivativeSummary section is empty, indicating no new option exercises or conversions were included in this specific insider filing.

How are the spouse and 401k holdings of the PKG CEO reported on this Form 4?

The filing lists 2,565 PKG shares held indirectly by the CEO’s spouse and 20,503 shares in a 401k plan. It specifies that he disclaims beneficial ownership of the spouse‑held shares, while both positions are categorized as indirect ownership entries.