Dimensional Fund Advisors holds 5.2% of AdvanSix

Dimensional Fund Advisors reports beneficial ownership of 1,407,349 shares of AdvanSix Inc. common stock, representing 5.2% of the class.

Rhea-AI Filing Summary

Dimensional Fund Advisors reports beneficial ownership of 1,407,349 shares of AdvanSix Inc. common stock, representing 5.2% of the class. The firm has sole voting power over 1,380,649 shares and sole dispositive power over 1,407,349 shares, with no shared voting or dispositive power.

The shares are owned by various funds and accounts advised or sub-advised by Dimensional and its subsidiaries. Because its role is to provide investment and voting discretion to these funds, Dimensional may be deemed a beneficial owner under Section 13(d) but expressly disclaims beneficial ownership. No single underlying fund’s interest exceeds 5% of the AdvanSix common stock.

Key Figures

Beneficial Ownership: 1,407,349 shares Percent of Class: 5.2% Sole Voting Power: 1,380,649 shares +3 more

6 metrics

Beneficial Ownership 1,407,349 shares Common shares of AdvanSix reported as beneficially owned by Dimensional Fund Advisors

Percent of Class 5.2% Portion of AdvanSix common stock represented by Dimensional’s reported holdings

Sole Voting Power 1,380,649 shares Shares of AdvanSix over which Dimensional has sole power to vote

Shared Voting Power 0 Shares of AdvanSix over which Dimensional has shared power to vote

Sole Dispositive Power 1,407,349 shares Shares of AdvanSix over which Dimensional has sole power to dispose

Shared Dispositive Power 0 Shares of AdvanSix over which Dimensional has shared power to dispose

Key Terms

beneficial owner, Sole Voting Power, Sole Dispositive Power, Investment Company Act of 1940, +1 more

5 terms

beneficial owner regulatory

"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 Voting Power regulatory

"5 | Sole Voting Power 1,380,649.00 6 | Shared Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

Sole Dispositive Power regulatory

"7 | Sole Dispositive Power 1,407,349.00 8 | Shared Dispositive Power 0.00"

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.

Investment Company Act of 1940 regulatory

"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.

Section 13(d) of the Securities Exchange Act of 1934 regulatory

"for any other purposes than Section 13(d) of the Securities Exchange Act of 1934"

Section 13(d) of the Securities Exchange Act of 1934 is a U.S. rule that requires anyone who buys more than 5% of a public company’s shares to publicly disclose who they are, how many shares they own, and their intentions toward the company. For investors, this is like a neighborhood alert when someone acquires a large stake in a building: it reveals potential changes in control or strategy that could affect the stock’s price, governance, or future direction.

FAQ

What percentage of AdvanSix (ASIX) does Dimensional Fund Advisors report owning?

Dimensional Fund Advisors reports beneficial ownership of 5.2% of AdvanSix common stock. This corresponds to 1,407,349 shares, held across multiple funds and accounts it advises, over which it has voting and/or investment power but for which it disclaims ultimate beneficial ownership.

How many AdvanSix (ASIX) shares does Dimensional Fund Advisors have voting power over?

Dimensional Fund Advisors has sole voting power over 1,380,649 shares of AdvanSix common stock. It reports no shared voting power, reflecting that voting authority is exercised solely through its advisory role for the underlying funds and accounts holding these shares.

What dispositive power does Dimensional Fund Advisors report over AdvanSix (ASIX) shares?

Dimensional Fund Advisors reports sole dispositive power over 1,407,349 shares of AdvanSix, with no shared dispositive power. This means it can direct how these shares are sold or otherwise disposed of for the benefit of the funds and accounts it advises.

Who is the actual owner of the AdvanSix (ASIX) shares reported by Dimensional Fund Advisors?

The reported AdvanSix shares are owned by various funds and accounts advised by Dimensional and its subsidiaries. Dimensional may be deemed a beneficial owner due to its authority but disclaims beneficial ownership of all such securities beyond Section 13(d) reporting purposes.

Does any single Dimensional-advised fund hold more than 5% of AdvanSix (ASIX)?

According to Dimensional, no single fund it advises holds more than 5% of AdvanSix common stock. The 5.2% aggregate stake arises from holdings across multiple funds and accounts, none of which individually crosses the 5% ownership threshold.

Where is Dimensional Fund Advisors organized and what is its role regarding AdvanSix (ASIX) shares?

Dimensional Fund Advisors is a Delaware limited partnership acting as investment adviser, manager, or sub-adviser. It provides investment and voting discretion for multiple funds that hold AdvanSix shares, which leads to the reported beneficial ownership while it disclaims ultimate economic ownership.

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

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Available on EDGAR 07/14/2026 - 01:27 PM 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

AdvanSix Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

00773T101

(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): 00773T101

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 1,380,649.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,407,349.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,407,349.00

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)

5.2 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: AdvanSix Inc
(b)	Address of issuer's principal executive offices: 300 Kimball Drive, Suite 101, Parsippany, NJ 07054
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 Number(s): 00773T101
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: 1,407,349 ** 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: 5.2 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,380,649** 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: 1,407,349** 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.
	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 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