[SCHEDULE 13G/A] Koppers Holdings Inc. Amended Passive Investment Disclosure

Koppers Holdings Inc. — filing reports a passive investor's beneficial ownership.

Rhea-AI Filing Summary

Koppers Holdings Inc. — filing reports a passive investor's beneficial ownership. Fuller & Thaler Asset Management, Inc. states beneficial ownership of 978,590.23 shares, representing 4.98% of common stock. The filer reports sole voting power of 963,104.23 shares and sole dispositive power of 978,590.23 shares.

The filing is an amendment to a Schedule 13G, signed by the Chief Compliance Officer on 05/13/2026, and is labeled as ownership of 5 percent or less of a class.

Insights

Institutional Ownership Analyst

Passive holder reports a sub-5% stake with voting and disposition control.

Fuller & Thaler Asset Management, Inc. reports beneficial ownership of 978,590.23 shares or 4.98% of Koppers common stock, with sole voting power over 963,104.23 shares. The filing amends a Schedule 13G and is signed by the firm's Chief Compliance Officer.

Because the stake is under 5% and the filing is a Schedule 13G/A, this is consistent with passive investment reporting; subsequent filings would show any increase above ownership thresholds.

Key Figures

Beneficial ownership: 978,590.23 shares Percent of class: 4.98% Sole voting power: 963,104.23 shares +2 more

5 metrics

Beneficial ownership 978,590.23 shares amount beneficially owned

Percent of class 4.98% Percent of common stock

Sole voting power 963,104.23 shares sole power to vote or direct the vote

Sole dispositive power 978,590.23 shares sole power to dispose or direct disposition

Filing signature date 05/13/2026 Signature by Chief Compliance Officer

Key Terms

Schedule 13G/A, beneficial ownership, sole dispositive power

3 terms

Schedule 13G/A regulatory

"amendment to a Schedule 13G, signed by the Chief Compliance Officer"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficial ownership financial

"Amount beneficially owned: 978590.23"

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.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 978590.23"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

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

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Accepted by SEC EDGAR 05/13/2026 - 04:33 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 12)

Koppers Holdings Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

50060P106

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 50060P106

1

Names of Reporting Persons

Fuller & Thaler Asset Management, Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

CALIFORNIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 963,104.23
6	Shared Voting Power 0.00
7	Sole Dispositive Power 978,590.23
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

978,590.23

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.98 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Koppers Holdings Inc.
(b)	Address of issuer's principal executive offices: 436 Seventh Avenue, Pittsburgh, PA 15219
Item 2.
(a)	Name of person filing: Fuller & Thaler Asset Management, Inc.
(b)	Address or principal business office or, if none, residence: 411 Borel Avenue, Suite 300, San Mateo, CA 94402
(c)	Citizenship: California corporation
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 50060P106
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 978590.23
(b)	Percent of class: 4.98%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 963104.23
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 978590.23
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

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.

Fuller & Thaler Asset Management, Inc.

Signature:	/s/ Hanna Zanoni
Name/Title:	Chief Compliance Officer
Date:	05/13/2026