[Form 4] Mueller Industries, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Mueller Industries (MLI) – Form 4 filed 07/31/2025

Chief Manufacturing Officer Steffen Sigloch reported two non-derivative transactions on 07/30/2025:

• Code A grant: 44,000 common shares acquired at $0.00. The filing states these shares "will vest on 7/30/2025." Direct ownership immediately after the grant stood at 164,375 shares.
• Code F disposition: 45,217 shares disposed of at $87.72, leaving 119,158 shares held directly.

No derivative securities were reported and no open-market trades occurred. The form was filed by a single reporting person and does not amend an earlier filing.

The activity reflects routine equity award vesting and an offsetting share disposition, resulting in a small net reduction of 1,217 shares in Sigloch’s direct stake, which remains substantial.

Positive

• Large equity award of 44,000 shares indicates ongoing incentive alignment with shareholders.
• Officer continues to hold 119,158 shares, maintaining a meaningful ownership position.

Negative

• Net share decrease of 1,217 shares due to Code F disposition at $87.72.

Insights

Securities Analyst

TL;DR: Routine equity vesting; neutral market impact.

The filing shows a standard equity award and an accompanying disposition, likely for tax or withholding purposes, with the officer still retaining 119 k shares. No open-market buying or selling suggests the insider’s long-term exposure remains largely unchanged, offering limited insight into management’s view of valuation. Transaction size is immaterial relative to MLI’s float, so I classify the event as neutral for investors.

Corporate Governance Expert

TL;DR: Governance-compliant disclosure, no red flags.

The Form 4 is timely, cites standard Section 16 codes (A and F) and includes attorney-in-fact authorization. Absence of derivative activity and clear explanation of vesting meet best-practice transparency standards. Because the disposition is coded F, it is not characterized as an open-market sale, reducing any negative perception. Overall, governance impact is neutral.

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^*

Sigloch Steffen

(Last) (First) (Middle)

3205 BLUE CYPRESS LN

(Street)

WELLINGTON FL 33414

(City) (State) (Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
07/30/2025

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	07/30/2025		A		44,000(1)	A	$0	164,375	D
Common Stock	07/30/2025		F		45,217	D	$87.72	119,158	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. These shares will vest on 7/30/2025.

Remarks:

	Anthony J. Steinriede, Attorney-in-Fact	07/31/2025
	** 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.

FAQ

How many Mueller Industries (MLI) shares did Steffen Sigloch acquire?

The filing shows an acquisition of 44,000 common shares on 07/30/2025 at $0.00 per share.

How many shares were disposed of in the latest Form 4?

Sigloch disposed of 45,217 shares on 07/30/2025 at $87.72 per share.

What is Sigloch’s current beneficial ownership in MLI?

After the reported transactions, he directly owns 119,158 common shares.

Were any derivative securities reported in this Form 4 filing?

No, the filing lists no derivative securities acquired or disposed of.

When will the newly acquired shares vest?

The 44,000 shares are reported to vest on 07/30/2025.