Albemarle (ALB) supply chain chief reports 375-share tax withholding

Rhea-AI Filing Summary

Albemarle Corp Chief Supply Chain Officer Mark Richard Mummert reported a tax-related share disposition tied to restricted stock vesting. On 2/24/2026, 375 shares of common stock were withheld at $186.83 per share to cover tax liabilities, leaving him with 14,165 directly held shares.

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^*

Mummert Mark Richard

(Last) (First) (Middle)

4250 CONGRESS ST, SUITE 900

SUITE 900

(Street)

CHARLOTTE NC 28209

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ALBEMARLE CORP [ ALB ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Supply Chain Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/24/2026

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	02/24/2026		F		375(1)	D	$186.83	14,165	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. Shares withheld to meet tax liabilities associated with vesting of Restricted Stock Units granted on 2/24/2023.

Remarks:

	/s/ Ander C. Krupa, Attorney-in-Fact	02/26/2026
	** 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 ALB executive Mark Richard Mummert report?

Albemarle executive Mark Richard Mummert reported a tax-withholding disposition of 375 common shares. These shares were withheld to cover tax liabilities from restricted stock units that vested on February 24, 2026, rather than being sold in an open market transaction.

How many Albemarle (ALB) shares were involved in Mummert’s Form 4 filing?

The Form 4 shows 375 shares of Albemarle common stock were disposed of through tax withholding. This occurred in connection with the vesting of restricted stock units granted on February 24, 2023, to satisfy the associated tax obligations at vesting.

At what price were the ALB shares valued in Mummert’s tax-withholding transaction?

The 375 Albemarle shares were valued at $186.83 per share for the tax-withholding disposition. This value is used to determine the amount of stock withheld to satisfy the tax liabilities triggered by the vesting of the restricted stock units.

How many Albemarle (ALB) shares does Mark Richard Mummert hold after this transaction?

After the tax-withholding disposition, Mummert directly holds 14,165 shares of Albemarle common stock. This figure reflects his ownership following the withholding of 375 shares to cover tax liabilities associated with vested restricted stock units.

Was Mummert’s Albemarle (ALB) Form 4 transaction an open market sale?

No, the Form 4 describes a tax-withholding disposition, not an open market sale. Shares were withheld by the company to meet tax liabilities arising from the vesting of restricted stock units granted on February 24, 2023.