Mueller Industries (NYSE: MLI) director exercises options, shares withheld for tax

Rhea-AI Filing Summary

Mueller Industries director Gary S. Gladstein exercised stock options for 9,778 shares of common stock at $12.625 per share on May 1, 2026. As part of the same event, 919 shares were disposed of in a tax-withholding disposition at $134.24 per share, meaning they were withheld to cover taxes rather than sold on the open market.

Following these transactions, Gladstein holds 30,878 common shares directly and 290,206 common shares indirectly through a trust where he serves as beneficiary. The filing shows a routine option exercise combined with tax withholding, with no open-market buying or selling.

Insider Trade Summary

9,778 shares exercised/converted

Mixed 4 txns

Insider GLADSTEIN GARY S

Role null

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right-to-Buy)	9,778	$0.00	--
Exercise	Common Stock	9,778	$12.625	$123K
Tax Withholding	Common Stock	919	$134.24	$123K
holding	Common Stock	--	--	--

Holdings After Transaction: Stock Option (Right-to-Buy) — 0 shares (Direct, null); Common Stock — 31,797 shares (Direct, null); Common Stock — 290,206 shares (Indirect, trust where he serves as beneficiary)

Footnotes (1)

Key Figures

Options exercised: 9,778 shares Exercise price: $12.625 per share Tax-withheld shares: 919 shares +4 more

7 metrics

Options exercised 9,778 shares Common Stock, exercised on May 1, 2026

Exercise price $12.625 per share Stock Option (Right-to-Buy) conversion price

Tax-withheld shares 919 shares Disposed in tax-withholding at $134.24 per share

Tax-withholding price $134.24 per share Value used for 919-share tax-withholding disposition

Direct holdings after transaction 30,878 shares Common Stock held directly after May 1, 2026

Indirect holdings via trust 290,206 shares Common Stock held indirectly through a trust

Option expiration date May 4, 2026 Expiration of exercised Stock Option (Right-to-Buy)

Key Terms

tax-withholding disposition, Stock Option (Right-to-Buy), derivative security, indirect ownership, +1 more

5 terms

tax-withholding disposition financial

"919 shares were disposed of in a tax-withholding disposition at $134.24 per share"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Stock Option (Right-to-Buy) financial

"security_title: Stock Option (Right-to-Buy) with 9,778 underlying shares"

derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

indirect ownership financial

"ownership_type: indirect, nature_of_ownership: trust where he serves as beneficiary"

beneficiary financial

"nature_of_ownership: trust where he serves as beneficiary"

Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

GLADSTEIN GARY S

(Last) (First) (Middle)

400 SE 5TH AVENUE NORTH 706

(Street)

BOCA RATON FLORIDA 33432

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
MUELLER INDUSTRIES INC [ MLI ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/01/2026

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

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

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

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	05/01/2026		M		9,778	A	$12.625	31,797	D
Common Stock	05/01/2026		F		919	D	$134.24	30,878	D
Common Stock								290,206	I	trust where he serves as beneficiary

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
Stock Option (Right-to-Buy)	$12.625	05/01/2026		M			9,778	05/04/2016	05/04/2026	Common Stock	9,778	$0	0	D

Explanation of Responses:

Remarks:

	Anthony J. Steinriede, Attorney-in-Fact	05/04/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Gary S. Gladstein report at Mueller Industries (MLI)?

Gary S. Gladstein reported exercising stock options for 9,778 shares of Mueller Industries common stock. The transaction occurred on May 1, 2026 and was paired with a tax-related share disposition, reflecting a routine compensation-related event rather than an open-market trade.

How many Mueller Industries shares did Gladstein acquire through option exercise?

Gladstein exercised stock options covering 9,778 shares of Mueller Industries common stock at a price of $12.625 per share. This converted a derivative position into common shares as part of his compensation, without indicating an open-market purchase decision at current trading prices.

Why were 919 Mueller Industries shares disposed of in Gladstein’s Form 4 filing?

The 919 shares were disposed of as a tax-withholding disposition at $134.24 per share. This means shares were withheld to satisfy tax obligations related to the option exercise, rather than being sold in an open-market transaction or reflecting a discretionary sale decision.

What are Gary S. Gladstein’s direct holdings in Mueller Industries after the transactions?

After the reported transactions, Gladstein directly owns 30,878 shares of Mueller Industries common stock. This figure reflects his direct holdings following the option exercise and associated tax-withholding disposition reported in the Form 4 filed for May 1, 2026.

What indirect Mueller Industries holdings does Gladstein report through a trust?

Gladstein reports indirect ownership of 290,206 Mueller Industries common shares through a trust where he serves as beneficiary. This indirect stake is separate from his directly held shares and is disclosed to show his broader economic interest associated with the trust structure.

Did Gladstein sell Mueller Industries shares on the open market in this Form 4?

The filing shows no open-market sale; the only disposition was 919 shares withheld for taxes. That tax-withholding disposition is a non-market transaction commonly used to cover tax obligations arising from stock option exercises or similar equity compensation events.