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Plan Highlights & Enrollment FormsPlexus Corp. 401(k) Retirement Plan

▶ Eligibility

• You are eligible to participate in the plan on your

date of hire.

▶ Contributions

Employee contributions

Before-tax and Roth 401(k) after-tax contributions

• Contributions are made by payroll deduction and

will begin as soon as administratively feasible after

you have enrolled in the plan.

• You may contribute from 1% to 75% of pay on a

before-tax and/or an after-tax basis through the

Roth 401(k) feature.

• The maximum combined before-tax and Roth401(k) annual contribution limit is $18,500 forcalendar year 2018.

• For more information about the Roth 401(k) after-

tax feature, see page 4.

• All new hires will be automatically enrolled in the

plan at a 4% before-tax contribution rate and in the

plan’s default investment option unless you specifi-

cally decline enrollment or elect to contribute at a

different rate.

• If you are automatically enrolled, Plexus Corp. will

automatically increase your contribution by 1%on an annual basis (January 1), up to 15%, unlessyou specifically decline the increase.

• Please read the Automatic Enrollment Notice on

page 6 for more information.

Catch-up contributions

• Employees age 50 or older by the end of the plan

year may contribute an additional $6,000 for 2018.

Rollover contributions

• New employees may be able to roll over assets from

prior employers’ qualified plans.

Employer contributions

• You will be eligible for the Safe Harbor employer

match on the first day of employment provided that

you contribute to the plan.

• Plexus Corp. matches 100% of the first 4% you

contribute to the plan.

▶ Vesting

• Vesting means ownership. When you are “vested”

you get to keep the “vested” portion of your

account.

• You are 100% vested in your before-tax, Roth 401(k)

after-tax, Safe Harbor employer match and rollover

contribution account balances.

• If you were subject to a plan merger into the

Plexus plan, prior plan vesting may apply to your

prior company contributions.

▶ Loans

Please refer to the Loan Rules Flyer or the Summary

Plan Description (SPD) online at plexus401k.com for

more details.*

• Available from your account balance for the lesser

of $50,000 or 50% of your vested account balance.

• Minimum loan amount is $1,000.

• A $50 loan initiation fee will be applied to each

loan amount.

Plan highlights

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* The Summary Plan Description has more details about the plan. The above information cannot change the terms or conditions of the plan. If there is a discrepancy between the plan and this Plan Highlights sheet, the Summary Plan Description governs.

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• A $50 annual loan maintenance fee will be

deducted for each loan in your account.

• Interest rate is prime rate plus 1% with the interest

paid back to your account.

• No more than three loans may be outstanding at

any time.

• The amount available for loans depends on plan

provisions and current value of your account, which

may be worth more or less than you invested.

▶ Withdrawals

Withdrawals made prior to age 59½ may be subject to

an additional 10% federal tax penalty.

Hardship withdrawal

You must first exhaust any loans you have available

under the 401(k) plan or a 59½ withdrawal (if eligible)

prior to applying for a hardship withdrawal. An existing

outstanding loan will satisfy these requirements.

• To pay tuition, related educational fees, and room

and board expenses for the next 12 months of post-

secondary education for you, your spouse, child, or

dependent.

• To purchase your primary residence (qualifying

documents required).

• To pay uninsured repair expenses resulting from a

casualty loss to your principal residence.

• To pay the amount needed to prevent eviction

from your principal residence or foreclosure on the

mortgage of your principal residence.

• To pay necessary uninsured medical expenses for

you, your spouse, your child, or dependent.

• To pay for burial or funeral expenses for your

deceased parent, spouse, child, or dependent.

In-service withdrawal

• If you are age 59½ or more, you may take an

in-service withdrawal from your vested balance

at any time.

▶ Benefit payments

Payments made prior to age 59½ may be subject to

an additional 10% federal tax penalty.

• Upon termination from Plexus Corp., your vested

account balance is available for distribution.

• Upon normal retirement, total disability, or

death, your account balance is 100% vested and

available for distribution to you or your named

beneficiary(ies).

QUICK LINK TIP

Want quick access to your account?

1. Go to plexus401k.com.

2. Click on Access My Account.

3. Log in to view or manage your account.

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▶ A Roth account trades a tax break now forone in the future

In very basic terms, Roth money is “after-tax” money.You contribute to your retirement account with after-tax dollars, and your contributions and any investmentearnings grow tax-free.

The money you withdraw from a Roth 401(k) accountat retirement is tax-free income, provided you are 59½or older and held your account for at least five years.Like your before-tax contributions to a traditionalretirement plan, your Roth after-tax contributions areimmediately fully vested and are available for loans orcompany matching.

▶ Should you consider a Roth after-taxaccount?

In general, a Roth after-tax account may make sensefor you if:

• You believe your tax rate will be higher in retirementthan today – the contributions made to your plan’sRoth after-tax account are taxed at today’s tax rateas opposed to paying what could be higher ratesat retirement.

• You expect your income to rise and you have alonger time horizon to save – making after-taxcontributions to the plan’s Roth account at

today’s tax rate may outweigh saving in a traditional before-tax account.

• You want to diversify your retirement savingsinto before-tax and after-tax accounts – the planprovides the flexibility for you to make contribu-tions to both the traditional before-tax and Rothafter-tax accounts. When it comes time to thinkabout distributions, it also provides you with moreoptions because of the different taxation of Rothafter-tax and traditional before-tax accounts.

• You want income flexibility in retirement – if youwant to limit the application of the required mini-mum distribution rules (which means you must takethe money by 70½), you can roll your Roth after-taxmoney (before reaching your required beginningdate) into a Roth IRA, where the money can remainbeyond age 70½.

The chart below provides a brief comparison of the main features of a traditional before-tax and a Roth after-tax account.

Understanding the plan’s roth after-tax feature

Determine if Roth account contributions are right for you

· Use the Roth calculator on www.massmutual.com/retirementaccess

· Call 1-800-854-0647 to get started

Sources: “Is a Roth 401(k) account right for you?,” US News & World Report, 8/10/07

COMPARING TRADITIONAL AND ROTH ACCOUNTSTRADITIONAL ACCOUNT ROTH ACCOUNT

You invest Pre-tax dollars After-tax dollars

Investment grows Tax-deferred

Income limitation No income limitation No income limitation like a Roth IRA

Withdrawals and earnings Withdrawals of contributions and investment earnings are subject to federal and most state income taxes.

Withdrawals of contributions and investment earnings are tax-free if you are 59½ or older and have held the account

for five years or more

Contribution limits* Contribution limit is $18,500 in 2018 ($24,500 for employees 50 and over).

Employer Match, if available Made by your employer with pre-tax dollars to accumulate in the same account and be taxed as income at withdrawal

Made by your employer with pre-tax dollars to accumulate in a separate account and be taxed as income at withdrawal

When changing jobs You can roll it into your new traditional 401(k) plan or an IRA You can roll it into a new Roth 401(k) plan or a Roth IRA

* Total combined traditional before-tax and Roth after-tax contributions to all qualified retirement plans cannot exceed $18,500 in 2018.

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Your fund options

▶ Pre-mixed by retirement date

• T. Rowe Price Retirement Balanced Trust F

• T. Rowe Price Retirement 2010 Trust F











▶ Build-your-own strategy

Stable Value

Wells Fargo Stable Return Fund C

Fixed Income

Vanguard Total Bond Market Institutional (VBTIX)

Vanguard Inflation Protected Securities (VAIPX)

MFS Emerging Market Debt R6 (MEDHX)

U.S. Equity

T. Rowe Price Equity Income I (REIPX)

Vanguard Institutional Index I (VINIX)

T. Rowe Price Blue Chip Growth I (TBCIX)

American Beacon Small Cap Value (AVFIX)

Voya Small Cap Opportunities R6 (ISOZX)

Foreign Equity

American Funds Europacific R6 (RERGX)

Lazard Emerging Markets Equity I (LZEMX)

Morgan Stanley Inst Frontier Emkts IS (MSRFX)

Hartford International Small Co. Y (HNSYX)

T. Rowe Price Intl Growth & Income I (TRTIX)

Hard Asset

PIMCO CommoditiesPlus Institutional l (PCLIX)

Company Stock

Plexus Company Stock Fund

The investment options for the Plexus Corp. 401(k) Retirement Plan are listed below. Fact sheets for each fund are posted online at plexus401k.com.

Employees hired or rehired who have not enrolled or

declined enrollment in the Plexus Corp. 401(k) Retirement

Plan (“Plexus plan”), will automatically be enrolled accord-

ing to the schedule outlined in the Auto-Enroll Time Table

below. An account in the Plexus plan will be established on

your behalf and 4% of your pay will be deposited as contri-

butions to the plan in lieu of receiving that amount as cash

compensation. This 4% automatic deferral percentage

will begin on your first paycheck following your automatic

enrollment date. As an employee about to enter the Plexus

plan, your contributions will be invested in the plan’s

default investment option, a T. Rowe Price Retirement Date Trust (based on your date of birth), unless you indicate your investment instructions during your enrollment process, as

outlined on the Enrollment Worksheet.

Plexus Corp. 401(k) Retirement Plan automatic enrollment notice

AUTO-ENROLL TIME TABLEMONTH OF HIRE/REHIRE ENROLL IN THE PLAN OR

DECLINE PARTICIPATIONAUTOMATIC ENROLLMENT DATE

January First paycheck thru February 20 March 1

February First paycheck thru March 20 April 1

March First paycheck thru April 20 May 1

April First paycheck thru May 20 June 1

May First paycheck thru June 20 July 1

June First paycheck thru July 20 August 1

July First paycheck thru August 20 September 1

August First paycheck thru September 20 October 1

September First paycheck thru October 20 November 1

October First paycheck thru November 20 December 1

November First paycheck thru December 20 January 1

December First paycheck thru January 20 February 1

Once you are automatically enrolled in the plan, Plexus

Corp. will automatically increase your contribution by 1% on an annual basis (January 1) up to 15%, unless you specifically decline the increase.

You have a right to DECLINE participation in the Plexus

plan. You also have a right to contribute more or less

than the automatic deferral percentage rate of 4%. Please

review the Enrollment Worksheet on page 8 and follow the

instructions shown in Step 1.

In addition, you will be able to change your contribution

percentage or elect to cease contributions altogether after

the automatic enrollment date. However, contributions

that have already been made, must remain in the Plexus

plan until you retire or separate from service.

If you have any questions, please contact your local

HR Representative.

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▶ Enroll online or over the phone

You can access either service anytime, from

virtually everywhere.

Enroll online via Retirement Access

1. Go to plexus401k.com and click “Login.” You will

be brought to the Retirement Access Home Page.

2. Follow the online instructions.

– Enter your nine-digit Social Security number as

your initial online User Name.

– Enter the month, day and year of your birthday

in an eight-digit format (MMDDYYYY) as your

initial online password.

– Choose a new online Password. Your new

Password must be between 8 and 12 characters

and contain at least two numbers and two

letters. Online passwords are case sensitive and

may contain special characters.

– Choose a new online User Name. Your new User

Name must be 8 to 25 characters long with no

alpha numeric requirements. Online user names

are not case sensitive.

3. Select the percentage of your pay that you would

like to contribute to the Plan. You may want to

consider contributing at least 4% to maximize the

company’s matching contribution feature.

4. Choose your investments.

For guidance on your investment strategy, please

contact the plan’s investment advisors at Francis

Investment Counsel at 1-866-232-6457.

Enroll using the Participant Information Center

1. Call 1-800-854-0647.

2. Follow the voice prompts.

– Enter your nine-digit Social Security number.

– Enter the month, day and year of your birthday

in an eight-digit format (MMDDYYYY) as your

initial Personal Identification Number (PIN).

– Choose a new telephone PIN. Your new PIN

must be between 4 and 8 numeric characters.

3. Select the percentage of your pay that you would

like to contribute to the Plan. You may want to

consider contributing at least 4% to maximize the

company’s matching contribution feature.

4. Choose your investments.

If you need assistance please press “0.” Participant

Service Representatives are available during regular

business hours, every business day.

Record your enrollment confirmation number

After you have entered and reviewed all your

information, you will be given an enrollment

confirmation number. Please make a record of this

number so that you can easily access your account

information should you have any questions.

Enrolling made easy

Online securityTo protect the integrity of your data, Retirement Access utilizes one of the most advanced encryption technologies available. To use the service, you will need a browser equipped with 128-bit encryption. If you do not have this type of browser, you can easily download one from the following sites:

Netscape (Navigator or Communicator) http://www.netscape.com

Microsoft (Internet Explorer) http://www.microsoft.com

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Name of Plan: Plexus Corp. 401(k) Retirement Plan Plan ID: 990517223

Employee Name _____________________________________________________________________________________

You have a right NOT to have your pay reduced and contributed to the Plexus plan. If you do not wish to contribute to the plan, please review the Automatic Enrollment Notice on page 6 AND follow Step 1 below to decline enrollment.

▶ Choose to enroll online or by phone

Log in to plexus401k.com, click "Login" and follow the online instructions in Step 2. Or, call the Participant InformationCenter at 1-800-854-0647 and follow the voice prompts. Say "Representative" if you would like to speak with aCustomer Service Representative for assistance.

1. Enroll or decline enrollment

Online: Enter your initial online user name and password per the instructions provided by Plexus Corp. in your new hire benefits email. You then will be prompted to create a new User Name and Password for more secure access to your account.

By Phone: Enter your initial Personal Identification Number (PIN) per the instructions provided by Plexus Corp. in your new hire benefits email. You then will be prompted to choose a new phone PIN for more secure access to your account.

Select "Enroll" or "Decline Enrollment."

If you select "Enroll," continue to the next step.

If you select "Decline Enrollment," you do not need to continue.

2. Choose Your Contribution Amount

Before-tax contribution between 1% and 75%: ___________%

Roth after-tax contribution between 1% and 75%: ___________%

3. Choose your Investments

The system will now prompt you to enter your investment choice. If you do not make any elections, 100% of your contributions will be automatically invested in a target date fund according to your date of birth. You will first hear or see that 100% of your contributions will be invested in a target retirement date fund. To change this, you must select an alternate investment.

While cycling through the fund choices on the phone system, you must enter or speak “0 %” if you do not wish to select a fund. Continue until you have made all of your selections. You do not have to invest your contributions in every fund listed, but make sure that your percentage amounts total 100%.

Enrollment worksheet

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If you select your own percentage for your portfolio, please check to make sure that the total equals 100%.

1 This option is a blend of company stock and cash. It is not a mutual fund.

Asset class/Fund Names Contribution Allocation %

PRE-MIXED BY RETIREMENT DATE CHOOSE ONE OF FOLLOWING

T. Rowe Price Retirement Balanced Trust F □ 100%T. Rowe Price Retirement 2010 Trust F □ 100%T. Rowe Price Retirement 2015 Trust F □ 100%T. Rowe Price Retirement 2020 Trust F □ 100%T. Rowe Price Retirement 2025 Trust F □ 100%T. Rowe Price Retirement 2030 Trust F □ 100%T. Rowe Price Retirement 2035 Trust F □ 100%T. Rowe Price Retirement 2040 Trust F □ 100%T. Rowe Price Retirement 2045 Trust F □ 100%T. Rowe Price Retirement 2050 Trust F □ 100%T. Rowe Price Retirement 2055 Trust F □ 100%T. Rowe Price Retirement 2060 Trust F □ 100%

BUILD-YOUR-OWN STRATEGY

Stable ValueWells Fargo Stable Return Fund C □ 100% or ___________%

Fixed Income

Vanguard Total Bond Market Institutional (VBTIX) □ 100% or ___________%Vanguard Inflation Protected Securities (VAIPX) □ 100% or ___________%MFS Emerging Market Debt R6 (MEDHX) □ 100% or ___________%

US Equity

T. Rowe Price Equity Income I (REIPX) □ 100% or ___________%Vanguard Institutional Index I (VINIX) □ 100% or ___________%T. Rowe Price Blue Chip Growth I (TBCIX) □ 100% or ___________%American Beacon Small Cap Value (AVFIX) □ 100% or ___________%Voya SmallCap Opportunities Fund R6 (ISOZX) □ 100% or ___________%

Hartford International Small Company Y (HNSYX)Foreign Equity □ 100% or ___________%

American Funds EuroPacific Growth R6 (RERGX) □ 100% or ___________% T. Rowe Price International Growth & Income I (TRTIX) □ 100% or ___________%Lazard Emerging Markets Institutional (LZEMX) □ 100% or ___________%Morgan Stanley Frontier Markets Inst EMkts IS (MSRFX) □ 100% or ___________%

Hard AssetPIMCO CommoditiesPlus Institutional l (PCLIX) □ 100% or ___________%

Company Stock □ 100% or ___________%Plexus Company Stock Fund1 □ 100% or ___________%

Total Must Equal 100% ___________%

3. Choose your Investments (continued)

Please review the plan’s investment fund lineup on plexus401k.com for detailed information about your investment options.

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4. Record your Enrollment Confirmation Number ____________________________________

If you enroll by Monday of any given week, your payroll deduction will begin with your following paycheck.

The system will repeat all of your contribution and investment choices and will give you another chance to

make changes, if needed.

Congratulations!

You’ve completed the important step in planning for your retirement future.

You may track your account balances or request changes to your investments or contribution amounts by calling

1-800-854-0647 or going online at plexus401k.com. For guidance on your investment strategy, please contact

Francis Investment Counsel, the plan’s investment advisor, at 1-866-232-6457.

Enrollment worksheet (Continued)

Please fill out this worksheet before you call or log in. Instructions to make changes to your account by phone or the

Internet. The Participant Information Center and Retirement Access give you two easy ways to make changes to your

account balance. All you need to do is complete this worksheet, and then call or log in to access your account. The system

will prompt you to input your choices, and then will confirm each of your entries.

Plexus Corp. 401(k) Retirement Plan automated change worksheet

CHANGES BY PHONE CHANGES BY INTERNET

1. Call 1-800-854-0647.

2. Follow the voice prompts.3. Say “Representative” if you would like to speak with a

Customer Service Representative for assistance.

1. Go to plexus401k.com and click on “Login.”

2. Follow the online instructions.

3. Call 1-800-854-0647 if you need assistance.

CHECK OFF WHICH TRANSACTION(S) YOU WOULD LIKE TO PROCESS

Menu Option Rebalancing REDISTRIBUTE EXISTING FUND BALANCES Realign your existing investments by percentages

Menu Option Systematic rebalancing AUTOMATIC REDISTRIBUTION OF EXISTING FUND BALANCES Set up your existing investments to automatically realign by percentages

Menu Option Allocation strategies ELECT OR CHANGE YOUR RETIREMENT DATE STRATEGY Select a strategy based on your retirement time horizon

Menu Option Automatic investing SYSTEMATIC INVESTMENT SELECTION Automatically invest your money in a retirement date strategy, based solely on your date of birth

Menu Option Investment elections CHANGE FUTURE CONTRIBUTION FUND CHOICES Select new investment options for your future contributions by percentages

Menu Option Exchanges TRANSFER EXISTING FUND BALANCES Exchange your fund balances between any of the fund choices in dollars or shares

Menu Option Contributions CHANGE YOUR PAYROLL CONTRIBUTIONS Increase or decrease traditional before-tax and/or Roth 401(k) after-tax contributions to the plan in percentages (1% to 75%)

The maximum combined before-tax and Roth 401(k) after-tax contribution is 75%

While cycling through the fund choices on the phone system, you must enter or speak “0%“ if you do not wish to select a

fund. Continue until you have made all of your selections.

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YOU MAY USE THIS CHART TO PLAN YOUR FUND CHANGES

Please review the plan’s Investment Fund Lineup on plexus401k.com for detailed information about your investment options.

PRE-MIXED BY TARGET DATE CURRENT CHOICES DESIRED CHANGES TO INVESTMENTS

T. Rowe Price Retirement Balanced Trust F Balanced BalancedT.Rowe Price Retirement 2010 Trust F 2010 2010

T. Rowe Price Retirement 2015 Trust F 2015 2015










If you select a target-date fund, you may only choose one, and you may not select any other investment options for your rollover contribution.

BUILD-YOUR-OWN STRATEGY CURRENT CHOICES DESIRED CHANGES TO INVESTMENTS

Stable Value

Wells Fargo Stable Return Fund C % %

Fixed Income

Vanguard Total Bond Market Institutional (VBTIX) % %

Vanguard Inflation Protected Securities (VAIPX) % %

MFS Emerging Market Debt R6 (MEDHX) % %

U.S. Equity

T. Rowe Price Equity Income I (REIPX) % %

Vanguard Institutional Index I (VINIX) % %

T. Rowe Price Blue Chip Growth I (TBCIX) % %

American Beacon Small Cap Value (AVFIX) % %

Voya SmallCap Opportunities Fund R6 (ISOZX) % %

Foreign Equity

T. Rowe Price International Growth & Income (TRTIX) % %

American Funds EuroPacific Growth R6 (RERGX) % %

Hartford International Small Company Y (HNSYX) % %

Lazard Emerging Markets Institutional (LZEMX) % %

Morgan Stanley Inst. Frontier Emkts IS (MSRFX) % %

Hard Asset

PIMCO CommoditiesPlus Institutional l (PCLIX) % %

Company Stock

Plexus Company Stock Fund1 % %

TOTAL MUST EQUAL 100% %

If you select individual investment options for your portfolio, please check to make sure that your total investment allocation equals 100%.

Automated change worksheet (continued)

1 This option is a blend of company stock and cash. It is not a mutual fund.

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Automated change worksheet (continued)

RECORD YOUR CONFIRMATION NUMBERS

You’re almost finished!

Note the Deferral Change Confirmation Number Date

Note the Investment Election Confirmation Number Date

New Before-tax Payroll Contribution % Date

New Roth 401(k) After-tax Contribution % Date

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RollovercontributionformNameofPlan:PlexusCorp.401(k)RetirementPlanPlanID:990517223

Pleasecomplete,sign,dateandreturnthisformalongwithyourrollovercheckto:

MassMutualRetirementServices Byovernightdelivery: MassMutualRetirementServicesP.O.Box1583 Hartford,CT06144

100 Bright Meadow Blvd.Enfield, CT 06082

1. ParticipantinformationSocialSecurityNumber _____________________________________________________Dateofbirth_________________________

Name____________________________________________________________________Dateofhire__________________________

Streetaddress_________________________________________________________________________________________________

City _____________________________________________________________________State_______________________________

Zipcode ___________________________________________Daytimephonenumber______________________________________

Informationonrollovers(Pleasereadcarefullybeforecompleting.)TheamountyourollovermustrepresentaneligiblerolloverdistributionfromaqualifiedretirementplanorconduitIRA.

Directrollover:Ifthisrequestrepresentsadirectrolloverfromaqualifiedretirementplan,yourcheckshouldbemadepayableto"PlexusCorp.401(k)RetirementPlanFBOParticipantName."

Non-directrollover:Ifthisrequestrepresentsanon-directrollovercontribution(youhavereceivedthismoneyfromapriorqualifiedplanorfromaconduitIRA),youmusthavereceivedthisrolloverdistributionnomorethan60daysbeforethedateyourrollovercontributionisreceivedbythePlan.Yourcheckshouldbemadepayableto"PlexusCorp.401(k)RetirementPlan"andyoumustincludeyourSocialSecurityNumberonthecheck.AnytaxconsequencesrelatedtothisrolloverareyourresponsibilityandyouagreethatPlexusCorp.andMassMutualRetirementServicesanditsaffiliateswillnotbeheldresponsibleforthesetaxconsequences.

2. Rolloversourceandamount

Rothafter-taxamounts:ArolloverofaRothafter-taxamountcangenerallyonlybemadetoadefinedcontributionplanifitisprocessedasa"directrollover."ThismeansthattheRothafter-taxamountcouldnothavebeenpaidtoyouandthenrolledover,butmusthavebeenpaiddirectlytothissuccessorplan.However,Rothafter-taxearningscanberolledovereveniftheamountwaspaiddirectlytoyou.AlsonotethatiftherolloverisfromaSection457planandproperty(assetsotherthancash)wasdistributed,specialrequirementsmayapplyandyoushouldcontactyourtaxadvisorbeforeauthorizinganyrollover.

Amountofrollover:Ielecttorollover$_____________intothePlexusCorp.401(k)RetirementPlan.(Note:Rolloverswillbeassumedtoconsistofpre-taxcontributionsandearningsunlessanafter-taxamountisindicatedbelow.RolloversfromIRAswillbeassumedtoconsistentirelyofpre-taxamountsbecauseafter-taxrolloverscannotbemade).

Sourceofrollover:PleasecompletethesectionbelowonlyifyourrollovercheckincludesRothafter-taxamounts.

$________ofrolloverrepresentsRothafter-taxcontributions("costbasis")andthecalendaryearoftheoriginalRothafter-taxcontributiontothedistributingplanis20____(enteryear).

$________ofrolloverrepresentingRothafter-taxearnings(ifthereisaloss,pleaseindicatewithaminus("-")sign.

Pleasenote:Costbasisandearningswillbeputintoaseparateaccountwithintheparticipant'srolloveraccount(s)unlessotherinstructionsareprovidedwiththisform.ThisisrequiredtoensurethatRothafter-taxbasisandearningsareaccountedforsepa-ratelyfromthenon-Rothportionsoftheaccount.

3. Investmentelectionsforyourrollovercontribution

Pleasereviewtheplan'sinvestmentFundLineuponplexus401k.comfordetailedinformationabouteachinvestmentoption.Foryourrollovercontribution,youmaychooseoneofthepre-mixedretirementdatefundsorbuildyourownportfoliofromamongtheinvestmentoptionsofferedthroughtheplan.

Assetclass/FundNames ContributionAllocation%

PRE-MIXEDBYRETIREMENTDATE CHOOSEONEOFFOLLOWING

F □ 100%F □ 100%F □ 100%F □ 100%F □ 100%F □ 100%F □ 100%F □ 100%F □ 100%F □ 100%F □ 100%F □ 100%

BUILD-YOUR-OWNSTRATEGY

StableValueWellsFargoStableReturnFundC □ 100%or___________%

FixedIncome

VanguardTotalBondMarketInstitutional(VBTIX) □ 100%or___________%VanguardInflationProtectedSecurities(VAIPX) □ 100%or___________%MFSEmergingMarketDebtR6(MEDHX) □ 100%or___________%

USEquity

□ 100%or___________%VanguardInstitutionalIndexI(VINIX) □ 100%or___________%

□ 100%or___________%AmericanBeaconSmallCapValue(AVFIX) □ 100%or___________%VoyaSmall CapOpportunitiesFundR6(ISOZX) □ 100%or___________%

Hartford International Small Company Y (HNSYX)Foreign Equity □ 100%or___________%

AmericanFundsEuroPacificGrowthR6(RERGX) □ 100%or___________%T. Rowe Price International Growth & Income □ 100%or___________%LazardEmergingMarketsInstitutional(LZEMX) □ 100%or___________%

□ 100%or___________%HardAsset

PIMCOCommoditiesPlusInstitutionall(PCLIX) □ 100%or___________%CompanyStock □ 100%or___________%

PlexusCompanyStockFund1 □ 100%or___________%

TotalMustEqual100% ___________%

Ifyouselectyourownpercentageforyourportfolio,pleasechecktomakesurethatthetotalequals100%.

1Thisoptionisablendofcompanystockandcash.Itisnotamutualfund.

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4. AuthorizationandsignatureAsaformerparticipantintheabove-referencedpriorplan,Icertifythat(1)thepriorplanisaqualifiedplanunderSection401(a)oftheInternalRevenueCodeoranindividualconduitretirementaccount(IRA)underCodeSection408(d)(3)andtheprovisionsofthetransferrerplanorIRAconduitaresuchthatthebenefitdescribedabovemaybetransferredtothisPlan;(2)thismoneyrepresentsemployerandsalarydeferralcontributionsonly(e.g.,therearenoafter-taxcontributionsinthisrolloverdistribution)and(3)Iunderstandthattheserolloverfunds,oncedepositedinthePlan,willbesubjecttoallprovisionsofthePlan,includingalldistributionrestrictions.

Employeesignature___________________________________________________________ Date____________________________

Rollovercontributionform(Continued)

Designation of beneficiaryBe sure to complete and sign this beneficiary designation form and return it to Human Resources. Plexus Corp., Attn: Benefits Team, One Plexus Way, P.O. Box 156, Neenah, WI 54957-0539

Name of Plan: Plexus Corp. 401(k) Retirement Plan Plan ID: 990517223

Name ________________________________________________________________________________________________________

Address ______________________________________________________________________________________________________

City ____________________________________________ State __________________________ Zip __________________________

Date of birth _____________________________________ Social Security Number _________________________________________

Marital status (check) □ Single □ Married

To the employee: important information about your designation of beneficiary(ies)If you are married: Your spouse is the sole primary beneficiary of your entire death benefit, unless you file with your employer a properly completed beneficiary designation and waiver. If you wish to name one or more beneficiaries other than your spouse, you must waive the right to the spousal benefit, designate your beneficiary(ies), and obtain the consent of your spouse to this waiver and beneficiary designation. Your spouse’s consent must be indicated by your spouse’s signature, which is either notarized or witnessed by an authorized plan representative. In the event that your spouse cannot be located, has abandoned you, is legally incompetent to give consent, or you and your spouse are separated, your employer will require additional supporting documents to determine whether or not spousal consent must be obtained.

If you are not married: You may designate your beneficiary(ies) and sign where indicated. Should you get married, this beneficiary designation will no longer be valid and your spouse will become the sole primary beneficiary of your death benefit unless a properly completed beneficiary designation and waiver are filed with the employer as detailed above.

For purposes of the Plan, the determination of whether you are married is made under federal law.

Note to participant: Should one of your primary beneficiaries predecease you, the Plan will allocate that beneficiary’s benefit to your remaining primary beneficiaries pro rata according to the below designations.

continued

17* A Social Security Number or Tax Identification Number are required for all beneficiary designations, including trusts.

Primary beneficiary(ies)Name (please print) ____________________________________________________ Social Security Number* ______________________________

Address __________________________________________________________________________________________________________________

Date of birth _______________ Relationship to Member _______________________________________ Percentage ______________________ %

Name (please print) ____________________________________________________ Social Security Number* ______________________________

Address __________________________________________________________________________________________________________________


Secondary/Contingent beneficiary(ies)Name (please print) ____________________________________________________ Social Security Number* ______________________________

Address __________________________________________________________________________________________________________________


Name (please print) ____________________________________________________ Social Security Number* ______________________________

Address __________________________________________________________________________________________________________________


18

As a participant in the Plan named above, I hereby acknowledge that (1) I have been informed by the employer that, if I am married, 100% of my Plan’s death benefit will be paid to my surviving spouse unless I waive this requirement and obtain the consent of my spouse to designate other beneficiary(ies); (2) I have the right to waive the designation of my spouse as the sole primary beneficiary only if my spouse consents in writing to this waiver; (3) any subsequent beneficiary designation I make in the future will require the consent of my spouse; and (4) if I am single, I can designate beneficiaries without consent but upon my marriage, my spouse will become sole primary beneficiary unless and until I designate a nonspousal beneficiary(ies), which designation will be invalid without the consent of my spouse. No designation shall be effective unless filed with and accepted by the employer. I also acknowledge that if more than one primary beneficiary has been designated, distributions from the Plan will be made in equal amounts, unless otherwise indicated, among those primary beneficiaries who survive the participant. If a designated primary beneficiary does not survive the participant, his share will be added to the share of each surviving primary beneficiary in the proportion that the share of each surviving primary beneficiary bears to the total shares of all surviving primary beneficiaries. If no primary beneficiary survives the participant, distribution will be made on the same basis to the designated secondary beneficiaries.

Signature of employee _________________________________________________________ Date ____________________________

Spousal consent (Required only if you chose a primary beneficiary other than your spouse)

I hereby consent to the foregoing designation of beneficiary(ies) made by the participant, my spouse. In so doing, I acknowledge that my consent is irrevocable with respect to these beneficiaries and that my consent may result in the payment of the participant’s death benefits, which would otherwise have been payable to me as the sole primary beneficiary if I survived the participant, to other beneficiaries. I also acknowledge my right to consent only to the designation of specific beneficiaries, and hereby exercise this right by consenting to the designation of those beneficiaries named by the participant above. Any subsequent designation of beneficiary(ies) by the participant during our marriage will therefore be invalid unless I consent to it.

Name of spouse _______________________________________________________________ SSN ____________________________

Signature of spouse ____________________________________________________________ Date ____________________________

Witness of spousal consent

Spousal consent must be witnessed by a Notary Public.

Witnessed by a Notary Public

Subscribed and sworn before me this

______ day of ___________________________________

Notary Public ___________________________________

State of ________________________________________

My commission expires _________________________________________________________ Date ____________________________

Authorization and signature (Please sign, date and return this form to Plexus Corp. Corporate Benefits Team, One Plexus Way, Neenah, WI 54957-0529).

I hereby represent and certify that the above information furnished by me is true and correct. I agree to notify my Plan Administrator immediately in the event my marital status changes. I hereby revoke any prior beneficiary designations I may have made.

Employer signature ____________________________________________________________ Date ____________________________

Designation of beneficiary (continued)

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Notes

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Notes

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© 2016Massachusetts Mutual Life Insurance Company, Springfield, MA 01111-0001. All rights reserved. www.massmutual.com. MassMutual Financial Group is a marketing name

for Massachusetts Mutual Life Insurance Company (MassMutual) [of which Retirement Services is a division] and its affiliated companies and sales representatives.RS2698 0616 C:33373-01

Generally target retirement date (lifecycle) investment options are designed to be held beyond the presumed retirement date to offer a continuing investment option for the investor in retirement. The year in the investment option name refers to the approximate year an investor in the option would plan to retire and likely would stop making new contributions to the investment option. However, investors may choose a date other than their presumed retirement date to be more conservative or aggressive depending on their own risk tolerance.

Target retirement date (lifecycle) investment options are designed for participants who plan to withdraw the value of their accounts gradually after retirement. Each of these options follows its own asset allocation path (“glide path”) to progressively reduce its equity exposure and become more conservative over time. Options may not reach their most conservative allocation until after their target date. Others may reach their most conservative allocation in their target date year. Investors should consider their own personal risk tolerance, circumstances and financial situation. These options should not be selected solely on a single factor such as age or retirement date. Please consult the prospectus (if applicable) pertaining to the options to determine if their glide path is consistent with your long-term financial plan. Target retirement date investment options’ stated asset allocation may be subject to change. Investments in these options are not guaranteed and you may experience losses, including losses near, at, or after the target date. Additionally, there is no guarantee that the options will provide adequate income at and through retirement.

Please consider an investment option’s objectives, risks, charges and expenses carefully before investing. This and other information about the investment option can be found in the applicable prospectuses (and/or summary prospectuses, if available), if any, or fact sheets for the investment options listed, which are available on the participant website at plexus401k.com or by contacting our Participant Information Center at 1-800-854-0647 between 8:00 a.m. and 8:00 p.m. ET, Monday through Friday. Please read them carefully before investing.

Money market investments are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although these investments seek to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in a money market option.

Risks of investing in inflation-protected bond investments include credit risk and interest rate risk. Neither the bond investment nor its yield is guaranteed by the U.S. Government.

High yield bond investments are generally subject to greater market fluctuations and risk of loss of income and principal than lower yielding debt securities investments.

Investment option(s) that track a benchmark index are professionally managed investments. However, the benchmark index itself is unmanaged and does not incur fees or expenses and cannot be purchased directly for investment.

Investments in companies with small or mid-market capitalization (“small caps” or “mid-caps”) may be subject to special risks given their characteristic narrow markets, limited financial resources, and less liquid stocks, all of which may cause price volatility.

International/global investing can involve special risks, such as political changes and currency fluctuations. These risks are heightened in emerging markets. Participants must submit purchase transactions for global and international investment options before 2:30 p.m. ET in order to receive that day’s price. Other trading restrictions may apply. Please see the investment’s prospectus for more details.

A significant percentage of the underlying investments in aggressive asset allocation portfolio options have a higher than average risk exposure. Investors should consider their risk tolerance carefully before choosing such a strategy.

An investment option with underlying investments (multi-investment options, target date funds and any other offered proprietary or non-proprietary asset-allocation, lifestyle, lifecycle or custom blended options) may be subject to the expenses of those underlying investments in addition to those of the investment option itself.

Participants with a large ownership interest in a company or employer stock investment option may have the potential to manipulate the value of units of this investment option through their trading practices. As a result, special transfer restrictions may apply. This type of investment option presents a higher degree of risk than diversified investment options under the plan because it invests in the securities of a single company.

Investments that invest more of their assets in a single issuer or industry sector (such as company stock or sector investments) involve additional risks, including unit price fluctuations, because of the increased concentration of investments.

A participant will be prohibited from transferring into most mutual funds and similar investment options if they have transferred into and out of the same option within the previous 60 days. Certain stable value, guaranteed interest, fixed income and other investment options are not subject to this rule. This rule does not prohibit participants from transferring out of any option at any time.

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