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UPDATING SUMMARY PROSPECTUS FOR EXISTING INVESTORS

May 1, 2024

FLEXIBLE SOLUTIONS^® VUL (2018)

VARIABLE LIFE INSURANCE POLICY

Issued by The Guardian Insurance & Annuity Company, Inc.

Separate Account N

The prospectus for the Flexible Solutions^® VUL (2018), an individual variable life insurance policy with an index-linked interest option offered by The Guardian Insurance & Annuity Company, Inc. (GIAC, we, us, our), contains more information about the Policy, including its features, benefits, and risks. You can find the current prospectus and other information about the Policy online at https://Guardianlife.onlineprospectus.net/Guardianlife/fs_vul2018/?ctype=product_prospectus. You can also obtain this information at no cost by calling 1-888-GUARDIAN (1-888-482-7342) or by sending an email request to GIAC_CRU@glic.com

Additional general information about certain investment products, including variable life insurance, has been prepared by the Securities and Exchange Commission’s staff and is available at Investor.gov.

The Securities and Exchange Commission has not approved or disapproved the Policy or passed upon the adequacy of this Summary Prospectus. Any representation to the contrary is a criminal offense.

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Special Terms Used in This Prospectus

Some of the special terms used in this prospectus are defined below. Special terms used in connection with the indexed option can be found in “The Indexed Option.”

Additional Sum Insured

This is additional insurance coverage that provides a level death benefit to the Policy Anniversary nearest the insured’s 100th birthday.

Alternate Net Cash Surrender Value

For Policies with the Alternate Net Cash Surrender Value Rider, this is the Net Cash Surrender Value plus a percentage of the total of all premium loads, administrative charges, and per $1,000 charges we have deducted and plus a percentage of the applicable surrender charge from the date of issue of your Policy up to and including the date the Alternate Net Cash Surrender Value is calculated. Beginning with Policy Month 84, the Alternate Net Cash Surrender Value equals the Net Cash Surrender Value.

Attained Age

The insured’s age on his or her birthday closest to the Policy Date plus the number of Policy Years completed since the Policy Date.

Basic Sum Insured

The amount of coverage provided by the Policy, excluding any Additional Sum Insured. The minimum Basic Sum Insured is currently $100,000 ($250,000 for the preferred plus non-tobacco (NT) risk class).

Business Day

Each day that GIAC processes transactions, currently including each day on which the New York Stock Exchange (NYSE) or its successor is open for trading. GIAC’s close of business is 4 p.m. New York time or, if earlier, the close of the NYSE. If any transaction or event occurs or is scheduled to occur on a day that is not a Business Day, or if a transaction request is received after GIAC’s close of business, such transaction or event will process on and as of the next following Business Day unless otherwise specified.

Cash Surrender Value

The Policy Account Value less any surrender charges, but not less than zero.

Coverage Year

The year commencing with the effective date of a Policy Segment or with an anniversary of that date.

Customer Service Office Contact Center

For telephonic communications:

Customer Service Office Contact Center

8:30 a.m. to 5:00 p.m. New York (eastern) time

1-888-GUARDIAN (1-888-482-7342)

Face Amount

The sum of the Basic Sum Insured, plus any Additional Sum Insured, after giving effect to increases made to the Basic Sum Insured and decreases made to the Basic Sum Insured and Additional Sum Insured since the Issue Date. On the Policy Anniversary on which the insured is Attained Age 100, all Additional Sum Insured coverage ends and thereafter the Face Amount will be the Basic Sum Insured plus any inforce Policy Segments in effect on the date of determination.

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Fund(s) (Portfolio Company(ies)

The open-end management investment companies, each corresponding to a variable investment option.

Good Order

Notice from the party authorized to initiate a transaction under this Policy in a form satisfactory to GIAC, including all information required by GIAC to process the requested transaction.

Guaranteed Coverage Rider

The Guaranteed Coverage Rider ensures that your Policy will not lapse, even if the Policy Account Value, after subtracting the Monthly Deduction and Policy Debt, is less than zero on a Monthly Processing Date, so long as the Guaranteed Coverage Requirement is satisfied.

Guaranteed Coverage Rider Minimum Monthly Premium

An amount used to determine whether your Policy satisfies the Guaranteed Coverage Rider Requirement. It is shown in your Policy. It varies based on issue age, sex and underwriting class of the insured.

Guaranteed Coverage Rider Test

A test that, if satisfied, protects your Policy from lapse when you have an in- force Guaranteed Coverage Rider. To satisfy the Guaranteed Coverage Rider Test on any Monthly Processing Date on which the Policy Account Value, after subtracting the Monthly Deduction and Policy Debt, is less than zero, you must have paid at least as much into your Policy, including amounts credited under any applicable Disability Benefit Rider, and minus Policy Debt and the accumulated value of all previous withdrawals, accumulated at 4.5% annual interest from the date of the applicable payment, crediting or withdrawal, as the sum of the Guaranteed Coverage Rider Minimum Monthly Premiums for all previous policy months up to the current Monthly Processing Date, as outlined in your Policy, accumulated at 4.5% annual interest. The sum of the Guaranteed Coverage Rider Minimum Monthly Premiums up to the applicable Monthly Processing Date shall not include Guaranteed Coverage Rider Minimum Monthly Premiums for any period during which the Monthly Deduction was waived under any applicable Waiver of Monthly Deductions rider.

Indexed Option definitions can be found in “The Indexed Option.”

Initial Face Amount

The sum of the Basic Sum Insured plus any Additional Sum Insured in force on the Policy’s Issue Date. The minimum Initial Face Amount is currently $100,000 ($250,000 for the preferred plus NT risk class).

Internal Revenue Code

The Internal Revenue Code of 1986, as amended, and its related rules and regulations.

Issue Date

The date your Policy is issued by GIAC.

Lien Amount

The sum of EAB rider distributions plus capitalized carrying charges less any Lien repayments.

Lien or Liens

The unpaid Lien Amount plus the accrued and unpaid carrying charges.

Loan Amount

The sum of any amounts borrowed plus any capitalized loan interest less any loan repayments.

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Mailing Address:

For regular mail:

The Guardian Insurance & Annuity Company, Inc.

P.O. Box 981588

El Paso, TX 79998-1588

For registered, certified, or express mail:

The Guardian Insurance & Annuity Company, Inc.

5951 Luckett Ct., Bldg A

El Paso, TX 79932

Minimum Monthly Premium

An amount used to determine whether your Policy meets the No Lapse Guarantee Condition, if applicable. It is shown in your Policy. It varies based on issue age, sex and underwriting class of the insured.

Minimum To Issue Premium

The amount of premium that must be paid in order for your Policy to take effect. It is shown in your Policy. It varies based on issue age, sex and underwriting class of the insured.

Monthly Deduction or Monthly Deductions

The total of the charges due and payable on each Monthly Processing Date.

Monthly Processing Date

The day of each Policy Month on which the Monthly Deduction is deducted from the Policy Account Value and certain Policy benefits and values are calculated. The Monthly Processing Date is the same date of each calendar month as the Policy Date, or the last day of a calendar month if that is earlier. If such calendar day is not a Business Day, the Monthly Processing Date will be the next following Business Day.

Net Accumulated Premiums

For death benefit Option 3, at issue, Net Accumulated Premiums equals the value of the initial premium payment. Thereafter, Net Accumulated Premiums will increase, as a result of premium payments made (prior to deductions for premium charges), and decrease, as a result of partial withdrawals. After a premium payment, Net Accumulated Premiums will be equal to the value of Net Accumulated Premiums before the premium payment plus the amount of the premium paid. After a partial withdrawal, Net Accumulated Premiums will be equal to the value of Net Accumulated Premiums prior to the withdrawal decreased by the adjusted amount of the withdrawal. The adjusted amount of the withdrawal is the amount of the partial withdrawal reduced by the portion of the withdrawal, if any, that exceeds Net Accumulated Premiums on the date of the withdrawal. Loan repayments, Lien repayments, and amounts paid under disability benefit riders are not considered premiums for purposes of determining Net Accumulated Premiums.

Net Amount At Risk

On any Monthly Processing Date, the amount calculated as the Net Amount at Risk death benefit less the Policy Account Value. The Net Amount at Risk death benefit is the greater of:

A separate Net Amount at Risk is determined for the Basic Sum Insured, Additional Sum Insured and for each Policy Segment. The Net Amount at Risk for any Policy Segment can never be less than zero.

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Net Cash Surrender Value

The Cash Surrender Value of your Policy less any Policy Debt, but not less than zero. The amount of any Lien will be deducted from the Net Cash Surrender Value prior to paying surrender proceeds.

Net Premium

The amount of premium that remains after we deduct premium charges from the premiums you pay.

No Lapse Guarantee

The No Lapse Guarantee ensures that your Policy will not lapse, even if the Policy Account Value, after subtracting the Monthly Deduction and Policy Debt is less than zero on a Monthly Processing Date, so long as the No Lapse Guarantee Condition is met.

No Lapse Guarantee Test

This test is used to determine whether your Policy qualifies for the No Lapse Guarantee. It states that, on any Monthly Processing Date, you must have paid at least as much into your Policy, including amounts credited under any applicable Disability Benefit Rider and minus Policy Debt and the sum of all previous withdrawals as the Minimum Monthly Premiums up to this date, as outlined in your Policy The sum of the Minimum Monthly Premiums up to

the applicable Monthly Processing Date does not include the Minimum Monthly Premium for any period during which the Monthly Deduction was waived under any applicable Waiver of Monthly Deductions Rider.

No Lapse Guarantee Period

The period, beginning on the Policy Date, during which the No Lapse Guarantee is in effect. The No Lapse Guarantee Period will terminate:

Policy Account Value

The Policy Account Value is the sum of the values of the variable investment options, the indexed option, the fixed-rate option and the Loan Account. The unloaned Policy Account Value is the Policy Account Value less the Loan Account, or less the Loan Amount if there is an indexed loan outstanding. On a Monthly Processing Date, it is the value after subtracting the Monthly Deductions due on that date.

Policy Anniversary

The same date each year as the Policy Date.

Policy Date

This date is used to measure Policy Months, Policy Years, Policy Anniversaries, and Monthly Processing Dates. It also determines the age of the insured at issue. Your Policy Date is shown on the Data Pages of your Policy.

Policy Debt

The unpaid Policy Loan Amount plus the accrued and unpaid interest on the loan.

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Policy Segment

The additional coverage provided by an increase in Face Amount.

Policy Year

The year commencing with the Policy Date or with an anniversary of that date.

Surrender Charge Period

The period during which a surrender charge will be payable if you surrender your Policy. The Surrender Charge Period varies depending upon age of the insured when the Policy is issued or the Face Amount increased

Target Premium

A measure of premium used to determine your Policy’s premium charges and agent commissions. Your Policy’s Basic Sum Insured, Additional Sum Insured and any Policy Segments you buy each have their own Target Premium. The Target Premium for the Basic Sum Insured and Additional Sum Insured is based on the insured’s age at issue, underwriting class and sex (unless gender-neutral rates are required by law). The Target Premium for a Policy Segment is based on the insured’s Attained Age and the underwriting class for that Policy Segment. The Target Premium for any rider, except the Guaranteed Coverage rider, is based on the Monthly Deduction for that rider during the first Policy Year.

Updated Information About Your Policy

The information in this Updating Summary Prospectus is a summary of certain Contract features that have changed since the Prospectus dated May 1, 2023. This may not reflect all of the changes that have occurred since you entered into your Contract. There have been changes to the underlying Funds’ information in the Fees and Expenses table and Appendix A that are contained in this Summary Prospectus.

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Important Information You Should Consider About the Policy

An investment in the Policy is subject to fees, risks, and other important considerations, some of which are briefly summarized in the following table. You should review the prospectus for additional information about these topics.

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Appendix A: Funds Available Under the Policy

The following is a list of Funds available under the policy. More information about the Funds is available in the prospectuses for the Funds, which may be amended from time to time and can be found online at https://Guardianlife.onlineprospectus.net/Guardianlife/fs_vul2018/?ctype=product_prospectus. You can also request this information at no cost by calling the Customer Service Office Contact Center at 1-888- GUARDIAN (1-888-482-7342) or by sending an email request to GIAC_CRU@glic.com. Depending on the optional benefits you choose, you may not be able to invest in certain Funds.

The current expenses and performance information below reflects fee and expenses of the Funds, but do not reflect the other fees and expenses that your contract may charge. Expenses would be higher and performance would be lower if these other charges were included. Each Fund’s past performance is not necessarily an indication of future performance.

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The prospectus and SAI are parts of the registration statement that we filed with the Securities and Exchange Commission (SEC), dated May 1, 2024. Both documents contain additional important information about the contract. The prospectus and SAI are incorporated herein by reference, which means they are legally a part of this Updating Summary Prospectus. You may request a free copy of the SAI or submit inquiries by calling 1-888-GUARDIAN (1-888-482-7342) or by visiting us online at https://Guardianlife.onlineprospectus.net/Guardianlife/fs_vul2018/?ctype=product_sai

You may also obtain reports and other information about GIAC on the SEC’s website at www.sec.gov, and copies of this information may be obtained, upon payment of a duplicating fee, by electronic request at the following email address: publicinfo@sec.gov.

Contract ID C000200090