Koppers director granted 3,280 RSUs

WILKERSON SONJA MICHELLE reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

WILKERSON SONJA MICHELLE reported acquisition or exercise transactions in this Form 4 filing.

Koppers Holdings Inc. director Sonja Michelle Wilkerson received a grant of 3,280 Restricted Stock Units (RSUs) on May 7, 2026. Each RSU represents the right to receive one share of common stock and was granted at $0.00 as part of director compensation.

After this award, Wilkerson holds 17,976 RSUs directly. According to the company’s Director Deferred Compensation Plan, the RSUs will be paid in common stock either in a lump sum or annual installments, starting on May 31 following her separation from service or a later May 31 date she previously elected.

Insider Trade Summary

Grant/Award: 3,280 shares

Grant/Award 1 txn

Insider WILKERSON SONJA MICHELLE

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	3,280	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 17,976 contracts (Direct)

Footnotes (2)

1. F1. Restricted Stock Units ("RSUs") represent the right to receive shares of common stock on a one-for-one basis.
2. F2. The RSUs become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

Key Figures

RSUs granted: 3,280 units Grant price per RSU: $0.00 per unit RSUs after transaction: 17,976 units

3 metrics

RSUs granted 3,280 units Restricted Stock Units granted on May 7, 2026

Grant price per RSU $0.00 per unit Compensation award, not open-market purchase

RSUs after transaction 17,976 units Total Restricted Stock Units directly held after grant

Key Terms

Restricted Stock Units, Director Deferred Compensation Plan, separation from service

3 terms

Restricted Stock Units financial

"Restricted Stock Units ("RSUs") represent the right to receive shares of common stock on a one-for-one basis."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Director Deferred Compensation Plan financial

"subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan")."

separation from service financial

"commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan)"

FAQ

What insider transaction did Koppers (KOP) director Sonja Wilkerson report?

Director Sonja Michelle Wilkerson reported receiving 3,280 Restricted Stock Units as a compensation grant. These RSUs are a right to receive common shares in the future, not an open-market stock purchase, and increase her direct deferred equity-based holdings in Koppers.

How many Koppers (KOP) RSUs does Sonja Wilkerson hold after this Form 4?

After the 3,280-unit grant, Sonja Michelle Wilkerson directly holds 17,976 Restricted Stock Units. These units represent a deferred right to receive an equal number of Koppers common shares, subject to the payout terms in the Director Deferred Compensation Plan.

Are the Koppers (KOP) RSUs granted to Sonja Wilkerson immediately paid in stock?

The RSUs are not paid immediately; they are deferred under the Director Deferred Compensation Plan. Payment occurs in shares, either as a lump sum or annual installments, starting on May 31 following her separation from service or a later May 31 date she previously chose.

What does one-for-one Restricted Stock Units mean for Koppers (KOP) directors?

One-for-one RSUs mean each unit entitles the holder to receive one share of Koppers common stock. For Sonja Wilkerson, 3,280 RSUs correspond to 3,280 future shares, subject to the timing and payout rules in the Director Deferred Compensation Plan.

Is Sonja Wilkerson’s Koppers (KOP) RSU grant an open-market stock purchase?

No, the RSU grant is a compensation award, not an open-market stock purchase. The 3,280 RSUs were granted at a price of $0.00 per unit and will convert into common shares later according to the company’s Director Deferred Compensation Plan.

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Accepted by SEC EDGAR 05/11/2026 - 04:17 PM Learn about SEC filing dates

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^*

WILKERSON SONJA MICHELLE

(Last) (First) (Middle)

436 SEVENTH AVENUE

(Street)

PITTSBURGH PENNSYLVANIA 15219

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Koppers Holdings Inc. [ KOP ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/07/2026

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)
			Code	V	Amount	(A) or (D)	Price

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(1)	05/07/2026		A		3,280		(2)	(2)	Common Stock	3,280	$0	17,976	D

Explanation of Responses:

1. Restricted Stock Units ("RSUs") represent the right to receive shares of common stock on a one-for-one basis.

2. The RSUs become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the "Plan"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person.

Remarks:

	/s/ Stephanie L. Apostolou, Attorney in Fact	05/11/2026
	** 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)