[Form 4] PLEXUS CORP Insider Trading Activity

Rhea-AI Filing Summary

Plexus Corp. (PLXS) executive Oliver K. Mihm, Exec VP & COO, reported several equity transactions in company stock. On 11/12/2025, 5,023 shares of common stock were acquired following the vesting and settlement of performance stock units, while 2,361 shares were disposed of at a price of $146.24 per share, typically reflecting shares withheld or sold to cover taxes. Mihm also made a bona fide gift of 1,100 shares of Plexus common stock.

The filing shows 981 shares of Plexus common stock held indirectly in the company’s 401(k) Retirement Plan. In addition, 1,383 new performance stock units were credited based on company performance. The company disclosed that 138% of the economic return portion of performance stock units granted in fiscal 2023 vested, while the portion tied to relative total shareholder return versus the S&P 400 Index has not yet completed its three-year performance period.

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^*

Mihm Oliver K.

(Last) (First) (Middle)

ONE PLEXUS WAY

(Street)

NEENAH WI 54956

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
PLEXUS CORP [ PLXS ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Exec VP & COO

3. Date of Earliest Transaction (Month/Day/Year)
11/12/2025

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, $.01 par value								981	I	401(k)(1)
Common Stock, $.01 par value	11/12/2025		M		5,023	A	(2)	24,230	D
Common Stock, $.01 par value	11/12/2025		F		2,361	D	$146.24	21,869	D
Common Stock, $.01 par value	11/12/2025		G		1,100	D	(3)	20,769	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
Performance Stock Units	(2)	11/12/2025		A		1,383		(2)	(2)	Common Stock, $.01 par value	1,383	(2)	8,083	D
Performance Stock Units	(2)	11/12/2025		M			5,023	(2)	(2)	Common Stock, $.01 par value	5,023	(2)	3,060	D

Explanation of Responses:

1. Shares of Plexus Corp. common stock held in the Plexus Corp. 401(k) Retirement Plan as of the last report from the Plan's trustee.

2. Based on Company performance during the three-year performance period, 138% of the portion of the Performance Stock Units ("PSUs") granted in fiscal 2023 related to economic return goals vested. The three-year performance period for the portion of the PSUs that vests based on the relative total shareholder return ("TSR") of the Company's common stock as compared to companies in the S&P 400 Index has yet to conclude. As previously disclosed, the reporting person had the opportunity to earn up to 200% of the targeted amount based on ER originally reported and has the opportunity to earn up to 150% of the targeted amount based on TSR originally reported.

3. Shares of Plexus Corp. common stock were given as a bona fide gift.

Remarks:

	/s/ Oliver K. Mihm, by Kate A. Gitter, Attorney-in-Fact	11/14/2025
	** 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

What did Plexus Corp (PLXS) executive Oliver K. Mihm report in this Form 4?

The Form 4 reports that Exec VP & COO Oliver K. Mihm acquired 5,023 shares of Plexus common stock upon settlement of performance stock units on 11/12/2025, disposed of 2,361 shares at $146.24 per share, and made a bona fide gift of 1,100 shares.

How many Plexus Corp (PLXS) shares does Oliver K. Mihm hold in the 401(k) plan?

The filing states that 981 shares of Plexus Corp. common stock are held indirectly in the Plexus Corp. 401(k) Retirement Plan, based on the last report from the plan’s trustee.

What performance stock units (PSUs) activity did Plexus Corp (PLXS) disclose for Mihm?

The report shows that 1,383 performance stock units were credited on 11/12/2025, and 5,023 PSUs were converted into an equivalent number of Plexus common shares, leaving 3,060 performance stock units beneficially owned afterward.

How did Plexus Corp’s performance affect the vesting of Mihm’s fiscal 2023 PSUs?

The company disclosed that, based on performance over a three-year period, 138% of the portion of fiscal 2023 performance stock units tied to economic return (ER) goals vested. The three-year performance period for the portion based on relative total shareholder return (TSR) versus the S&P 400 Index is still ongoing.

What is the maximum PSU payout opportunity mentioned for Plexus Corp (PLXS) PSUs?

The disclosure notes that Mihm had the opportunity to earn up to 200% of the targeted amount of PSUs based on economic return and up to 150% of the targeted amount based on relative TSR, as originally reported.

What types of Form 4 transaction codes appear in this Plexus Corp (PLXS) filing?

The filing uses transaction codes including M (exercise or conversion of derivative securities), F (payment of tax liability by delivering or withholding securities), and G (bona fide gift) for Plexus common stock and related performance stock units.