BlackRock Reports 7.1% Stake in Advansix

Advansix Inc. reported that BlackRock, Inc. (and certain Reporting Business Units) beneficially owned 1,919,001 shares of Common Stock, representing 7.1% of the class as of 03/31/2026.

Rhea-AI Filing Summary

Advansix Inc. reported that BlackRock, Inc. (and certain Reporting Business Units) beneficially owned 1,919,001 shares of Common Stock, representing 7.1% of the class as of 03/31/2026. The filing states BlackRock has sole voting power for 1,891,978 shares and sole dispositive power for 1,919,001 shares. The Schedule 13G/A clarifies that various underlying investors may hold economic interests and includes exhibits for power of attorney and Item 7 subsidiary identification.

Insights

Institutional Ownership Analyst

BlackRock reports a 7.1% beneficial stake in Advansix, with sole voting and dispositive powers largely held.

BlackRock's Schedule 13G/A shows 1,919,001 shares beneficially owned as of 03/31/2026. The filing attributes ownership to specific Reporting Business Units and lists voting/dispositive counts.

Ownership over 5% is reportable under Schedule 13G/A; subsequent filings could update percentages or changes in control. Exhibits include a Power of Attorney and Item 7 subsidiary details.

Corporate Governance Specialist

The filing documents agency structure and confirms no single third party holds >5% beneficial interest beyond BlackRock's reported stake.

The Schedule notes that various persons have rights to dividends or proceeds but none exceed 5% individually. The filing attaches Exhibit 24 and Exhibit 99 to clarify authority and subsidiary identification.

Governance watchers should note the delineation of sole voting versus dispositive power in the filing; timing of any material change would appear in amendments.

Key Figures

Beneficial ownership: 1,919,001 shares Percent of class: 7.1% Sole voting power: 1,891,978 shares +1 more

4 metrics

Beneficial ownership 1,919,001 shares as of 03/31/2026

Percent of class 7.1% percent of common stock

Sole voting power 1,891,978 shares number with sole power to vote

Sole dispositive power 1,919,001 shares number with sole power to dispose

Key Terms

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

3 terms

Schedule 13G/A regulatory

"This Schedule 13G/A reflects the securities beneficially owned"

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: 1919001"

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: 1919001"

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.

FAQ

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

What stake does BlackRock report in ADVANSIX (ASIX)?

BlackRock reports beneficial ownership of 1,919,001 shares, equal to 7.1% of Advansix common stock as of 03/31/2026. The Schedule 13G/A lists voting and dispositive power attributed to BlackRock's Reporting Business Units and includes related exhibits.

Who holds voting and dispositive power for the reported shares?

The filing shows sole voting power for 1,891,978 shares and sole dispositive power for 1,919,001 shares as reported by BlackRock. These counts are attributed to the Reporting Business Units named in the Schedule 13G/A.

Does the filing identify other parties with economic interests over these shares?

Yes. The Schedule states that various persons have rights to dividends or sale proceeds, but it also says no single person's interest exceeds 5% of common shares. Detailed subsidiary or entity listings are attached in Exhibit 99.

What supporting exhibits are included with this Schedule 13G/A?

The filing includes Exhibit 24 (Power of Attorney) and Exhibit 99 (Item 7 subsidiary identification). These exhibits provide signature authority and identify the subsidiary or business units involved in the reported acquisition.

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

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 5)

ADVANSIX INC

(Name of Issuer)

Common Stock

(Title of Class of Securities)

00773T101

(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): 00773T101

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 1,891,978.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,919,001.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,919,001.00

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)

7.1 %

12

Type of Reporting Person (See Instructions)

HC

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: 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.: 00773T101
Item 4.	Ownership
(a)	Amount beneficially owned: 1919001
(b)	Percent of class: 7.1 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1891978
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1919001
	(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. Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of ADVANSIX INC. No one person's interest in the common stock of ADVANSIX INC is more than five percent of the total outstanding common shares.
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