AdvanSix (ASIX) HR chief awarded 22,485 restricted stock units

Rhea-AI Filing Summary

AdvanSix Inc. reported that SVP and Chief HR Officer Kelly Slieter acquired 22,485 shares of common stock through a grant of restricted stock units valued at $17.79 per share. These units are scheduled to vest in three equal annual installments beginning on the first anniversary of the grant date. Following this award, Slieter directly owns 70,453 shares of AdvanSix common stock.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

SLIETER KELLY

(Last) (First) (Middle)

300 KIMBALL DRIVE, SUITE 101

(Street)

PARSIPPANY NJ 07054

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
AdvanSix Inc. [ ASIX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, Chief HR Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/26/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $0.01	02/26/2026		A		22,485(1)	A	$17.79	70,453	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Grant of restricted stock units pursuant to the 2016 Stock Incentive Plan of AdvanSix Inc. and its Affiliates, as Amended and Restated, which are scheduled to vest in three equal annual installments on the first three anniversaries of the grant date.

Remarks:

	/s/ Achilles B. Kintiroglou for Kelly Slieter	03/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transaction did AdvanSix (ASIX) report for Kelly Slieter?

AdvanSix reported an equity award to Kelly Slieter of 22,485 shares of common stock via restricted stock units. The units were granted under the 2016 Stock Incentive Plan and represent a non-cash acquisition rather than an open-market purchase.

How many AdvanSix (ASIX) shares did Kelly Slieter receive and at what value?

Kelly Slieter received 22,485 shares of AdvanSix common stock through a restricted stock unit grant valued at $17.79 per share. This value reflects the grant-date price used for the equity award calculation.

How will Kelly Slieter’s AdvanSix (ASIX) restricted stock units vest?

Kelly Slieter’s restricted stock units are scheduled to vest in three equal annual installments on the first three anniversaries of the grant date. This creates a multi-year vesting schedule tied to continued service with AdvanSix.

What is Kelly Slieter’s AdvanSix (ASIX) share ownership after this grant?

After the restricted stock unit grant, Kelly Slieter directly owns 70,453 shares of AdvanSix common stock. This figure reflects her total direct holdings immediately following the reported equity award transaction.

Under which plan were Kelly Slieter’s AdvanSix (ASIX) restricted stock units granted?

The restricted stock units were granted under the 2016 Stock Incentive Plan of AdvanSix Inc. and its Affiliates, as Amended and Restated. This plan governs the terms, conditions, and vesting of the equity award.

Is Kelly Slieter’s AdvanSix (ASIX) transaction a purchase or an award?

Kelly Slieter’s transaction is an equity award, not an open-market purchase. It is classified as a grant or other acquisition of restricted stock units, consistent with her role as SVP and Chief HR Officer.