Koppers Holdings: Simcoe reports about 5.6% stake

The reported ownership percentages use 18,911,568 Koppers shares outstanding as of July 31, 2026.

Rhea-AI Filing Summary

Koppers Holdings Inc. (KOP) is the issuer in an amended beneficial-ownership report by Simcoe Capital Management, LLC and affiliated reporting persons. Simcoe Capital Management and its managing member, Jeffrey Jacobowitz, each reported beneficial ownership of 1,063,279 shares, or approximately 5.6%; Simcoe Management Company, LLC reported 1,027,494 shares, or approximately 5.4%. These are overlapping attributed positions: the report says reporting persons may be deemed owners of shares held directly by other reporting persons, while disclaiming beneficial ownership except to the extent of pecuniary interest. Simcoe Partners directly held 873,494 shares, Simcoe Select 154,000, and SDR Partners 35,785. Their respective aggregate purchase prices were approximately $24,977,523, $6,544,634, and $1,213,593, including brokerage commissions. The shares were purchased in open-market purchases with working capital, which may include margin loans made by brokerage firms in the ordinary course of business. The reported percentages are based on 18,911,568 shares outstanding as of July 31, 2026.

Key Figures

Beneficially owned shares: 1,063,279 shares Ownership percentage: 5.6% Directly owned shares: 873,494 shares +5 more

8 metrics

Beneficially owned shares 1,063,279 shares Reported by Simcoe Capital Management, LLC and Jeffrey Jacobowitz

Ownership percentage 5.6% Reported by Simcoe Capital Management, LLC and Jeffrey Jacobowitz

Directly owned shares 873,494 shares Simcoe Partners

Aggregate purchase price Approximately $24,977,523 Simcoe Partners shares; includes brokerage commissions

Directly owned shares 154,000 shares Simcoe Select

Aggregate purchase price Approximately $6,544,634 Simcoe Select shares; includes brokerage commissions

Directly owned shares 35,785 shares SDR Partners

Aggregate purchase price Approximately $1,213,593 SDR Partners shares; includes brokerage commissions

Key Terms

aggregate amount beneficially owned, sole power to dispose, working capital, margin loans

4 terms

aggregate amount beneficially owned financial

"Aggregate amount beneficially owned by each reporting person"

sole power to dispose financial

"Sole power to dispose or direct the disposition"

working capital financial

"purchased with working capital"

Working capital is the money a business has available to cover its daily expenses, like paying bills and buying supplies. It’s like the cash in your wallet that helps you handle everyday costs; having enough ensures the business can operate smoothly without running into money shortages.

margin loans financial

"may include margin loans made by brokerage firms"

Margin loans are loans from a brokerage that let an investor borrow money using their existing stocks, bonds or cash as collateral to buy more securities. They matter because borrowing magnifies both gains and losses—like using a lever to move a heavier load—so small market moves can have outsized effects on your returns; investors also pay interest and risk a margin call, where the broker may force sales if collateral falls below required levels.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many KOP shares does Simcoe Capital report owning?

Simcoe Capital Management, LLC reported beneficial ownership of 1,063,279 shares, approximately 5.6% of the class. Its managing member, Jeffrey Jacobowitz, reported the same amount. The report explains that reporting persons may be deemed owners of shares held directly by other reporting persons.

What were the aggregate purchase prices for Simcoe's KOP shares?

Simcoe Partners' 873,494 directly owned shares had an aggregate purchase price of approximately $24,977,523; Simcoe Select's 154,000 shares, approximately $6,544,634; and SDR Partners' 35,785 shares, approximately $1,213,593. Each amount includes brokerage commissions.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/22/2026 - 06:29 PM EDT Accepted by SEC EDGAR 10/22/2026 - 06:28 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)

Koppers Holdings Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

50060P106

(CUSIP Number)

JEFFREY JACOBOWITZ
SIMCOE CAPITAL MANAGEMENT, LLC, 540 Madison Avenue, 27th Floor
New York, NY, 10022
212-448-7400

STEVE WOLOSKY & IAN ENGORON
OLSHAN FROME WOLOSKY LLP, 1325 Avenue of the Americas
New York, NY, 10019
212-451-2300

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

10/20/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 50060P106

1

Name of reporting person

Simcoe Capital Management, LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 1,063,279.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 1,063,279.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

1,063,279.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

5.6 %

14

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13D

CUSIP Number(s): 50060P106

1

Name of reporting person

SIMCOE PARTNERS L P

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 873,494.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 873,494.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

873,494.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

4.6 %

14

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13D

CUSIP Number(s): 50060P106

1

Name of reporting person

Simcoe Select, LP

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 154,000.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 154,000.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

154,000.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.8 %

14

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13D

CUSIP Number(s): 50060P106

1

Name of reporting person

SIMCOE MANAGEMENT COMPANY, LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 1,027,494.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 1,027,494.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

1,027,494.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

5.4 %

14

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13D

CUSIP Number(s): 50060P106

1

Name of reporting person

SDR Partners, LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 35,785.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 35,785.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

35,785.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.2 %

14

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13D

CUSIP Number(s): 50060P106

1

Name of reporting person

Jacobowitz Jeffrey

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 1,063,279.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 1,063,279.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

1,063,279.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

5.6 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock
(b)	Name of Issuer: Koppers Holdings Inc.
(c)	Address of Issuer's Principal Executive Offices: 436 SEVENTH AVENUE, PITTSBURGH, PENNSYLVANIA , 15219.
Item 3.	Source and Amount of Funds or Other Consideration
	Item 3 is hereby amended and restated to read as follows: The shares of the Issuer's Common Stock (the "Shares") purchased by each of Simcoe Partners, Simcoe Select and SDR Partners were purchased with working capital (which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business) in open market purchases. The aggregate purchase price of the 873,494 Shares directly owned by Simcoe Partners is approximately $24,977,523, including brokerage commissions. The aggregate purchase price of the 154,000 Shares directly owned by Simcoe Select is approximately $6,544,634, including brokerage commissions. The aggregate purchase price of the 35,785 Shares directly owned by SDR Partners is approximately $1,213,593, including brokerage commissions.
Item 5.	Interest in Securities of the Issuer
(a)	Item 5(a) is hereby amended and restated to read as follows: The aggregate percentage of Shares reported owned by each person named herein is based on 18,911,568 Shares outstanding, as of July 31, 2026, which is the total number of Shares outstanding as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 6, 2026. A. Simcoe Partners As of the date hereof, Simcoe Partners directly owned 873,494 Shares. Percentage: approximately 4.6% B. Simcoe Select As of the date hereof, Simcoe Select directly owned 154,000 Shares. Percentage: less than 1% C. Simcoe Management Simcoe Management, as the general partner of Simcoe Partners and Simcoe Select, may be deemed the beneficial owner of the (i) 873,494 Shares owned by Simcoe Partners and (ii) 154,000 Shares owned by Simcoe Select. Percentage: approximately 5.4% D. SDR Partners As of the date hereof, SDR Partners directly owned 35,785 Shares. Percentage: less than 1% E. Simcoe Capital Simcoe Capital, as the investment manager to each of Simcoe Partners, Simcoe Select and SDR Partners, may be deemed the beneficial owner of the (i) 873,494 Shares owned by Simcoe Partners, (ii) 154,000 Shares owned by Simcoe Select and (iii) 35,785 Shares owned by SDR Partners. Percentage: approximately 5.6% F. Mr. Jacobowitz Mr. Jacobowitz, as Managing Member of each of Simcoe Management and Simcoe Capital, may be deemed the beneficial owner of the (i) 873,494 Shares owned by Simcoe Partners, (ii) 154,000 Shares owned by Simcoe Select and (iii) 35,785 Shares owned by SDR Partners. Percentage: approximately 5.6%
(b)	Item 5(b) is hereby amended and restated to read as follows: A. Simcoe Partners 1. Sole power to vote or direct vote: 873,494 2. Shared power to vote or direct vote: 0 3. Sole power to dispose or direct the disposition: 873,494 4. Shared power to dispose or direct the disposition: 0 B. Simcoe Select 1. Sole power to vote or direct vote: 154,000 2. Shared power to vote or direct vote: 0 3. Sole power to dispose or direct the disposition: 154,000 4. Shared power to dispose or direct the disposition: 0 C. Simcoe Management 1. Sole power to vote or direct vote: 1,027,494 2. Shared power to vote or direct vote: 0 3. Sole power to dispose or direct the disposition: 1,027,494 4. Shared power to dispose or direct the disposition: 0 D. SDR Partners 1. Sole power to vote or direct vote: 35,785 2. Shared power to vote or direct vote: 0 3. Sole power to dispose or direct the disposition: 35,785 4. Shared power to dispose or direct the disposition: 0 E. Simcoe Capital 1. Sole power to vote or direct vote: 1,063,279 2. Shared power to vote or direct vote: 0 3. Sole power to dispose or direct the disposition: 1,063,279 4. Shared power to dispose or direct the disposition: 0 F. Mr. Jacobowitz 1. Sole power to vote or direct vote: 1,063,279 2. Shared power to vote or direct vote: 0 3. Sole power to dispose or direct the disposition: 1,063,279 4. Shared power to dispose or direct the disposition: 0 Each Reporting Person, as a member of a "group" with the other Reporting Persons for the purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended, may be deemed the beneficial owner of the Shares directly owned by the other Reporting Persons. Each Reporting Person disclaims beneficial ownership of such Shares except to the extent of his or its pecuniary interest therein.
(c)	Item 5(c) is hereby amended and restated to read as follows: The transactions in the Shares by the Reporting Persons during the past 60 days are set forth in Exhibit 1 and incorporated herein by reference.
Item 7.	Material to be Filed as Exhibits.
	Item 7 is hereby amended to add the following exhibit: 1 - Transactions in Securities

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Simcoe Capital Management, LLC

Signature:	/s/ Jeffrey Jacobowitz
Name/Title:	Jeffrey Jacobowitz, Managing Member
Date:	10/22/2026

SIMCOE PARTNERS L P

Signature:	/s/ Jeffrey Jacobowitz
Name/Title:	Jeffrey Jacobowitz, Managing Member of Simcoe Management Company, LLC (its General Partner)
Date:	10/22/2026

Simcoe Select, LP

Signature:	/s/ Jeffrey Jacobowitz
Name/Title:	Jeffrey Jacobowitz, Managing Member of Simcoe Management Company, LLC (its General Partner)
Date:	10/22/2026

SIMCOE MANAGEMENT COMPANY, LLC

Signature:	/s/ Jeffrey Jacobowitz
Name/Title:	Jeffrey Jacobowitz, Managing Member
Date:	10/22/2026

SDR Partners, LLC

Signature:	/s/ Jeffrey Jacobowitz
Name/Title:	Jeffrey Jacobowitz, Managing Member of Simcoe Management Company, LLC (its Investment Manager)
Date:	10/22/2026

Jacobowitz Jeffrey

Signature:	/s/ Jeffrey Jacobowitz
Name/Title:	Jeffrey Jacobowitz
Date:	10/22/2026