Kaiser Aluminum stake of 4.7% reported by Dimensional

Dimensional Fund Advisors LP reports that it may be deemed to beneficially own 775,944 shares of Kaiser Aluminum Corp common stock, representing 4.7% of the class.

Rhea-AI Filing Summary

Dimensional Fund Advisors LP reports that it may be deemed to beneficially own 775,944 shares of Kaiser Aluminum Corp common stock, representing 4.7% of the class. It has sole voting power over 758,606 shares and sole dispositive power over 775,944 shares, with no shared voting or dispositive power.

The shares are owned by various investment companies, commingled funds, group trusts and separate accounts it advises (the “Funds”). Dimensional states that no individual Fund holds more than 5% of the class and disclaims beneficial ownership of all such securities beyond Section 13(d) purposes.

Key Figures

Shares Beneficially Owned: 775,944 shares Percent of Class: 4.7 % Sole Voting Power: 758,606 shares +3 more

6 metrics

Shares Beneficially Owned 775,944 shares Aggregate number of Kaiser Aluminum common shares Dimensional may be deemed to beneficially own

Percent of Class 4.7 % Portion of Kaiser Aluminum common stock represented by Dimensional’s reported holdings

Sole Voting Power 758,606 shares Shares for which Dimensional reports sole power to vote or direct the vote

Shared Voting Power 0 shares Shares for which Dimensional reports shared power to vote

Sole Dispositive Power 775,944 shares Shares for which Dimensional reports sole power to dispose or direct disposition

Shared Dispositive Power 0 shares Shares for which Dimensional reports shared dispositive power

Key Terms

beneficial owner, sole power to vote, disclaims beneficial ownership, Investment Company Act of 1940, +1 more

5 terms

beneficial owner financial

"may be deemed to be the beneficial owner of the shares of the Issuer"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

sole power to vote financial

"Sole power to vote or to direct the vote: 758,606"

disclaims beneficial ownership financial

"Dimensional disclaims beneficial ownership of such securities."

Investment Company Act of 1940 regulatory

"four investment companies registered under the Investment Company Act of 1940"

A U.S. federal law that sets the rulebook for pooled investment vehicles such as mutual funds, exchange-traded funds and similar money managers, requiring them to register with regulators, disclose holdings and fees, limit conflicts of interest, and follow governance standards. It matters to investors because these protections and transparency rules act like a referee and scoreboard, helping people compare funds, trust that managers follow fair practices, and spot hidden costs or risks.

separate accounts financial

"commingled funds, group trusts and separate accounts"

Separate accounts are pools of investments that a financial firm keeps apart from its main assets to manage for a specific client, insurance product, or institutional mandate. They matter to investors because the account’s gains, losses and risks apply only to the clients linked to it rather than the firm overall, so returns and protections can differ from pooled or company‑backed assets—think of it like a private toolbox reserved for a single job instead of shared with everyone.

FAQ

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

What percentage of Kaiser Aluminum (KALU) does Dimensional Fund Advisors report owning?

Dimensional Fund Advisors may be deemed to beneficially own 775,944 Kaiser Aluminum shares, equal to 4.7% of the common stock. These shares are held across multiple client funds and accounts, and Dimensional disclaims beneficial ownership beyond Section 13(d) reporting purposes.

How many Kaiser Aluminum (KALU) shares does Dimensional Fund Advisors have voting power over?

Dimensional Fund Advisors reports 758,606 Kaiser Aluminum shares with sole voting power and 0 shares with shared voting power. It also reports sole dispositive power over 775,944 shares, reflecting its authority when acting for the client funds it advises.

Who actually owns the Kaiser Aluminum (KALU) shares reported by Dimensional Fund Advisors?

All reported Kaiser Aluminum shares are owned by various Funds advised or managed by Dimensional Fund Advisors and its subsidiaries. These include investment companies, commingled funds, group trusts and separate accounts. Dimensional disclaims beneficial ownership of the securities held in these client accounts.

Why did Dimensional Fund Advisors report its Kaiser Aluminum (KALU) holdings?

Dimensional Fund Advisors reported its Kaiser Aluminum holdings because it may be deemed to beneficially own 775,944 shares, or 4.7% of the class, through client funds. This level of ownership requires disclosure under Section 13(d) of the Securities Exchange Act of 1934.

Does any single Dimensional Fund hold more than 5% of Kaiser Aluminum (KALU)?

No. Dimensional states that, to its knowledge, the interest of any one Fund in Kaiser Aluminum does not exceed 5% of the class. The reported 4.7% aggregate interest is spread across multiple funds and accounts it advises or manages.

What dispositive powers over Kaiser Aluminum (KALU) shares does Dimensional Fund Advisors report?

Dimensional Fund Advisors reports sole dispositive power over 775,944 Kaiser Aluminum shares and no shared dispositive power. This reflects its authority to direct the disposition of these shares for the client funds, while still disclaiming beneficial ownership of the securities.

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

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Accepted by SEC EDGAR 07/14/2026 - 01:27 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Kaiser Aluminum Corp

(Name of Issuer)

Common Stock

(Title of Class of Securities)

483007704

(CUSIP Number)

06/30/2026

(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): 483007704

1

Names of Reporting Persons

Dimensional Fund Advisors LP

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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 758,606.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 775,944.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

775,944.00

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)

4.7 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Kaiser Aluminum Corp
(b)	Address of issuer's principal executive offices: 1550 W Mcewen Dr, Suite 500, Franklin, TN 37067
Item 2.
(a)	Name of person filing: Dimensional Fund Advisors LP
(b)	Address or principal business office or, if none, residence: 6300 Bee Cave Road, Building One, Austin, TX 78746
(c)	Citizenship: Delaware Limited Partnership
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 483007704
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: 775,944 ** see Note 1 ** ** Note 1 ** Dimensional Fund Advisors LP, an investment adviser registered under Section 203 of the Investment Advisors Act of 1940, furnishes investment advice to four investment companies registered under the Investment Company Act of 1940, and serves as investment manager or sub-adviser to certain other commingled funds, group trusts and separate accounts (such investment companies, trusts and accounts, collectively referred to as the "Funds"). In certain cases, subsidiaries of Dimensional Fund Advisors LP may act as an adviser or sub-adviser to certain Funds. In its role as investment advisor, sub-adviser and/or manager, Dimensional Fund Advisors LP or its subsidiaries (collectively, "Dimensional") may possess voting and/or investment power over the securities of the Issuer that are owned by the Funds, and may be deemed to be the beneficial owner of the shares of the Issuer held by the Funds. However, all securities reported in this schedule are owned by the Funds. Dimensional disclaims beneficial ownership of such securities. In addition, the filing of this Schedule 13G shall not be construed as an admission that the reporting person or any of its affiliates is the beneficial owner of any securities covered by this Schedule 13G for any other purposes than Section 13(d) of the Securities Exchange Act of 1934.
(b)	Percent of class: 4.7 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 758,606** see Note 1 **
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 775,944** see Note 1 **
	(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.
	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 Funds described in Note 1 above have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the securities held in their respective accounts. To the knowledge of Dimensional, the interest of any one such Fund does not exceed 5% of the class of securities. Dimensional Fund Advisors LP disclaims beneficial ownership of all such securities.
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.

Dimensional Fund Advisors LP

Signature:	Selwyn Notelovitz
Name/Title:	Global Chief Compliance Officer
Date:	07/14/2026