BlackRock holds 15.3% of Koppers Holdings Inc. (NYSE: KOP) in Schedule 13G/A

Rhea-AI Filing Summary

BlackRock, Inc. amended a Schedule 13G to report beneficial ownership of 2,952,521 shares of Koppers Holdings Inc. Common Stock as of 03/31/2026, representing 15.3% of the class. The filing shows sole voting power for 2,923,873 shares and sole dispositive power for 2,952,521 shares.

The filing states the interest of iShares Core S&P Small-Cap ETF exceeds 5% of Koppers common stock. The amendment is signed by a Managing Director on behalf of BlackRock and attaches Exhibits 24 and 99.

Insights

Institutional Ownership Analyst

BlackRock holds a sizable 15.3% position in Koppers, reported via Schedule 13G/A.

BlackRock is disclosed as beneficial owner of 2,952,521 shares with sole voting and dispositive power over nearly the same amount. This signals a material institutional stake that may influence liquidity and block trading activity.

Ownership filings show passive reporting under Schedule 13G/A rather than 13D; future changes in reported percentages will be visible in subsequent amendments.

Securities Compliance Counsel

The amendment clarifies reporting structure and identifies a >5% holder tied to an ETF.

The filing documents reporting business units and cites SEC Release No. 34-39538 for aggregation rules. It also lists Exhibits 24 (power of attorney) and 99 (Item 7 subsidiary information) consistent with parent/subsidiary disclosure practices.

Any change in voting or dispositive power or classification would require a new amendment; filings should be monitored for subsequent updates.

Key Figures

Shares beneficially owned: 2,952,521 shares Percent of class: 15.3% Sole voting power: 2,923,873 shares +2 more

5 metrics

Shares beneficially owned 2,952,521 shares Amount beneficially owned as of 03/31/2026

Percent of class 15.3% Percent of Koppers common stock reported in Schedule 13G/A

Sole voting power 2,923,873 shares Sole power to vote or direct the vote reported on the cover page

Sole dispositive power 2,952,521 shares Sole power to dispose or direct disposition reported on the cover page

Related >5% holder iShares Core S&P Small-Cap ETF Named as another person with interest over 5% in Item 6

Key Terms

Schedule 13G/A, beneficially owned, sole dispositive power

3 terms

Schedule 13G/A regulatory

"Amendment No. 6 to Schedule 13G/A reporting beneficial ownership"

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.

beneficially owned financial

"Amount beneficially owned: 2952521"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 2952521"

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 04/24/2026 - 04:11 PM Learn about SEC filing dates

FAQ

What stake does BlackRock (KOP) report in Koppers Holdings Inc.?

BlackRock reports beneficial ownership of 2,952,521 shares, representing 15.3% of Koppers common stock as of 03/31/2026. The filing lists sole voting power for 2,923,873 shares.

Does the Schedule 13G/A filing indicate voting control by BlackRock in KOP?

The filing shows sole voting power for 2,923,873 shares and sole dispositive power for 2,952,521 shares. These figures are reported by BlackRock under the Schedule 13G/A amendment dated 03/31/2026.

Is any other holder over 5% disclosed in the Koppers filing?

Yes. The filing states that iShares Core S&P Small-Cap ETF has an interest exceeding 5% of Koppers common stock. No further shareholder list is provided in the excerpt.

What exhibits are attached to BlackRock's Schedule 13G/A amendment?

The amendment attaches Exhibit 24 (Power of Attorney) and Exhibit 99 (Item 7 subsidiary identification). The signature block shows the filing was signed by a Managing Director on 04/24/2026.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 6)

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

BlackRock, 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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,923,873.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,952,521.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,952,521.00

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)

15.3 %

12

Type of Reporting Person (See Instructions)

HC

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: BlackRock, Inc. In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 50060P106
Item 4.	Ownership
(a)	Amount beneficially owned: 2952521
(b)	Percent of class: 15.3 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 2923873
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 2952521
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The interest of 1 such person, iShares Core S&P Small-Cap ETF, in the common stock of KOPPERS HOLDINGS INC is more than five percent of the total outstanding common stock.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99
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.

BlackRock, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	04/24/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7