Form of 2.950% Senior Notes due 2023

THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAYBE REQUIRED PURSUANT TO SECTION 305 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 305 OF THE INDENTURE, (III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT TO SECTION 310 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE COMPANY.

THIS NOTE AND THE GUARANTEES THEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE ‘‘SECURITIES ACT’’), AND ACCORDINGLY, MAY NOT BE OFFERED OR SOLD WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS EXCEPT AS SET FORTH IN THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF, THE HOLDER (1) REPRESENTS THAT (A) IT IS A ‘‘QUALIFIED INSTITUTIONAL BUYER’’ (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) OR (B) IT IS NOT A U.S. PERSON AND IS ACQUIRING THIS NOTE IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH REGULATION S UNDER THE SECURITIES ACT, (2) AGREES THAT IT WILL NOT, PRIOR TO THE DATE THAT IS

144A Notes Only [ONE YEAR (OR SUCH SHORTER PERIOD AS IS PRESCRIBED BY RULE 144 UNDER THE SECURITIES ACT AS THEN IN EFFECT OR ANY SUCCESSOR RULE WITHOUT ANY VOLUME OR MANNER OF SALE RESTRICTIONS OR COMPLIANCE BY THE ISSUER WITH ANY CURRENT PUBLIC INFORMATION REQUIREMENTS THEREUNDER) AFTER THE LATER OF THE ISSUE DATE AND THE LAST DATE ON WHICH THE ISSUER OR ANY OF ITS AFFILIATES WERE THE OWNER OF SUCH SECURITY (OR ANY PREDECESSOR THERETO),

For Regulation S Note Only [IS 40 DAYS AFTER THE LATER OF THE ORIGINAL ISSUE DATE HEREOF AND THE DATE ON WHICH THIS SECURITY (OR ANY PREDECESSOR OF SUCH SECURITY) WAS FIRST OFFERED TO PERSONS OTHER THAN DISTRIBUTORS (AS DEFINED IN RULE 902 OF REGULATION S) IN RELIANCE ON REGULATIONS S]

OFFER, RESELL, PLEDGE OR OTHERWISE TRANSFER THIS NOTE EXCEPT (A) TO THE ISSUER, A GUARANTOR OR ANY SUBSIDIARY THEREOF, (B) FOR SO LONG AS THE NOTES ARE ELIGIBLE FOR RESALE PURSUANT TO RULE 144A, TO PERSONS REASONABLY BELIEVED TO BE A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH REGULATION S UNDER THE SECURITIES ACT, (D) PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE SECURITIES ACT (IF AVAILABLE), (E) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT, OR (F) PURSUANT TO ANY OTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND (3) AGREES THAT IT WILL GIVE TO EACH PERSON TO WHOM THIS SECURITY IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. PRIOR TO THE REGISTRATION OF ANY TRANSFER IN ACCORDANCE WITH 2(C) AND 2(F) ABOVE, THE ISSUER RESERVES THE RIGHT TO REQUIRE THE DELIVERY OF SUCH LEGAL OPINIONS, CERTIFICATIONS OR OTHER EVIDENCE AS MAY REASONABLY BE REQUIRED IN ORDER TO DETERMINE THAT THE PROPOSED TRANSFER IS BEING MADE IN COMPLIANCE WITH THE SECURITIES ACT AND APPLICABLE STATE SECURITIES LAWS. AS USED HEREIN, THE TERMS ‘‘OFFSHORE TRANSACTION,’’ ‘‘UNITED STATES’’ AND ‘‘U.S. PERSON’’ HAVE THE MEANINGS GIVEN TO THEM BY REGULATION S UNDER SECURITIES ACT. THE INDENTURE CONTAINS A PROVISION REQUIRING THE TRUSTEE TO REFUSE TO REGISTER ANY TRANSFER OF THIS NOTE IN VIOLATION OF THE FOREGOING RESTRICTION.

For Regulation S Note Only [BY ITS ACQUISITION HEREOF, THE HOLDER HEREOF REPRESENTS THAT IT IS NOT A U.S. PERSON, NOR IS IT PURCHASING FOR THE ACCOUNT OF A U.S. PERSON, AND IS ACQUIRING THIS SECURITY IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH REGULATION S UNDER THE SECURITIES ACT.]

LEIDOS, INC., a Delaware corporation (the “Issuer”), for value received promises to pay to CEDE & CO. or registered assigns the principal sum of [ ] on May 15, 2023.

Interest Payment Dates: May 15 and November 15 (each, an “Interest Payment Date”), commencing on November 15, 2020.

Interest Record Dates: May 1 and November 1 (each, an “Interest Record Date”).

Reference is made to the further provisions of this Note contained herein, which will for all purposes have the same effect as if set forth at this place.

IN WITNESS WHEREOF, the Issuer has caused this Note to be signed manually or by facsimile by its duly authorized officer.

This is one of the Notes of the series designated herein and referred to in the within-mentioned Indenture,

Dated: May 12, 2020

CITIBANK, N.A., as Trustee

Leidos Holdings, Inc. (“Holdings” or the “Guarantor”) unconditionally guarantees, to the extent set forth in the Indenture and subject to the provisions of the Indenture, the due and punctual payment of the principal of, any premium and interest on the Notes, when and as the same shall become due and payable, whether at maturity, redemption, repayment or otherwise, and the other obligations set forth in, and all in accordance with the terms of Article Thirteen of the Indenture.

The obligations of the undersigned to the Holders of the Notes and to the Trustee pursuant to this Guarantee and in the Indenture are expressly set forth in the Indenture and reference is hereby made to the Indenture for the precise terms of the Guarantee and all of the other provisions of the Indenture to which this Guarantee relates.

IN WITNESS WHEREOF, the Guarantor has caused this Note to be signed manually or by facsimile by its duly authorized officer.

1.    Interest

LEIDOS, Inc. (the “Issuer”) promises to pay interest on the principal amount of this Note at the rate per annum described above. Cash interest on the Notes will accrue from the most recent date to which interest has been paid; or, if no interest has been paid, from May 12, 2020. Interest on this Note will be paid to but excluding the relevant Interest Payment Date. The Issuer will pay interest semi-annually in arrears on each Interest Payment Date, commencing November 15, 2020. Interest will be computed on the basis of a 360-day year consisting of twelve 30-day months in a manner consistent with Rule 11620(b) of the NASD Uniform Practice Code.

The Issuer shall pay interest on overdue principal from time to time on demand at the rate borne by the Notes and on overdue installments of interest (without regard to any applicable grace periods) to the extent lawful.

The interest rate payable on the Notes (as defined below) will be subject to adjustments from time to time if either Moody’s or S&P or, if either Moody’s or S&P ceases to rate the Notes or fails to make a rating of the Notes publicly available for reasons outside of Issuer’s control, a “nationally recognized statistical rating organization” within the meaning of Section 3(a)(62) under the Exchange Act, selected by Issuer as a replacement agency for Moody’s or S&P (a “substitute rating agency”), downgrades (or subsequently upgrades) the credit rating assigned to the Notes in the manner described below.

If the rating from Moody’s (or any substitute rating agency therefor) of the Notes is decreased to a rating set forth in the immediately following table, the interest rate on the Notes will increase such that it will equal the interest rate payable on the Notes on the date of their initial issuance plus the percentage set forth opposite the ratings from the table below, plus any applicable percentage from the immediately following paragraph.

In addition, if the rating from S&P (or any substitute rating agency therefor) of the Notes is decreased to a rating set forth in the immediately following table, the interest rate on the Notes will increase such that it will equal the interest rate payable on the Notes on the date of their initial issuance plus the percentage set forth opposite the ratings from the table below, plus any applicable percentage from the immediately following paragraph.

Notwithstanding the forgoing, if at any time the interest rate on the Notes has been adjusted upward and either Moody’s or S&P (or, in either case, a substitute rating agency therefor), as the case may be, subsequently increases its rating of the Notes to any of the threshold ratings set forth above, the interest rate on the Notes will be decreased such that the interest rate for the Notes equals the interest rate payable on the Notes on the date of their initial issuance plus the percentages set forth opposite the ratings from the tables above in effect immediately following the increase in rating. If Moody’s (or any substitute rating agency therefor) subsequently increases its rating of the Notes to Baa3 or higher (or its respective equivalent, in either case of any substitute rating agency or under any successor rating categories of Moody’s), and S&P (or any substitute rating agency therefor) increases its rating to BBB- or higher (or its respective equivalent, in either case of any substitute rating agency or under any successor rating categories of S&P), the interest rate on the Notes will be decreased to the interest rate payable on the Notes on the date of their initial issuance. In addition, the interest rates on the Notes will permanently cease to be subject to any adjustment described above (notwithstanding any subsequent downgrade in the ratings by either or both rating agencies) if the Notes become rated Baa1 and BBB+ (or the equivalent of either such rating, in the case of a substitute rating agency) or higher by Moody's and S&P (or, in either case, a substitute rating agency therefor), respectively (or one of these ratings if the notes are only rated by one rating agency).

Each adjustment required by any decrease or increase in a rating set forth above (or an equivalent rating, in either case of any substitute rating agency or under any successor rating categories of Moody’s or S&P, as the case may be), whether occasioned by the action of Moody’s or S&P (or, in either case, a substitute rating agency therefor), shall be made independent of any and all other adjustments; provided, however, in no event shall (1) the interest rate for the Notes be reduced to below the interest rate payable on the Notes on the date of their initial issuance or (2) the total increase in the interest rate on the Notes exceed 2.00% above the interest rate payable on the Notes on the date of their initial issuance.

Except as provided in this paragraph and the immediately following paragraph, no adjustments in the interest rate of the Notes shall be made solely as a result of a rating agency ceasing to provide a rating of the Notes. If at any time fewer than two rating agencies provide a rating of the Notes for any reason beyond Issuer’s control, Issuer will use commercially reasonable efforts to obtain a rating of the Notes from a substitute rating agency, to the extent one exists, and if a substitute rating agency exists, for purposes of determining any increase or decrease in the interest rate on the Notes pursuant to the tables above:

For so long as only one rating agency provides a rating of the Notes, any subsequent increase or decrease in the interest rate of the Notes necessitated by a reduction or increase in the rating by the rating agency providing the rating shall be twice the percentage set forth in the applicable table above. For so long as none of Moody’s, S&P or a substitute rating agency provides a rating of the Notes, the interest rate on the Notes will increase to, or remain at, as the case may be, 2.00% above the interest rate payable on the Notes on the date of their initial issuance. If Moody’s or S&P either ceases to rate the Notes for reasons within Issuer’s control or ceases to make a rating of the Notes publicly available for reasons within Issuer’s control, Issuer will not be entitled to obtain a rating from a substitute rating agency and the increase or decrease in the interest rate of the Notes shall be determined in the manner described above as if either only one or no rating agency provides a rating of the Notes.

Any interest rate increase or decrease described above will take effect from the first day of the interest period commencing after the date on which a rating change occurs that requires an adjustment in the interest rate. If Moody’s or S&P (or, in either case, a substitute rating agency therefor) changes its rating of the Notes more than once during any particular interest period, the last change by such agency will control for purposes of any interest rate increase or decrease with respect to the Notes described above relating to such rating agency’s action.

If the interest rate payable on the Notes increased as described above, the term “interest” under the Indenture will be deemed to include any such additional interest unless the context otherwise requires.

Within ten Business Days after the commencement of each interest period, the Issuer shall provide to the Trustee an Officers’ Certificate certifying as to the current ratings on the Notes and the applicable interest rates applicable to the Notes in effect during that interest period (upon which the Trustee may conclusively rely). Without limiting the foregoing, in the absence of any such notice, the Trustee shall be protected in assuming the interest rate is the same as the interest rate applicable in the prior interest period, and the Trustee shall not have any obligation to monitor the ratings on the Notes.

2.    Paying Agent.

Initially, Citibank, N.A. (the “Trustee”) will act as paying agent. The Issuer may change any paying agent without notice to the Holders.

3.    Indenture; Defined Terms.

This Note is one of the 4.375% Notes due 2030 (the “Notes”) issued under an indenture dated as of May 12, 2020 (the “Base Indenture”) by and between the Issuer, Leidos Holdings, Inc. (the “Guarantor”) and the Trustee, and established pursuant to an Officer’s Certificate dated May 12, 2020, issued pursuant to Section 2.01 and Section 3.01 thereof (together, the “Indenture”). This Note is a “Security” and the Notes are “Securities” under the Indenture.

For purposes of this Note, unless otherwise defined herein, capitalized terms herein are used as defined in the Indenture. The terms of the Notes include those stated in the Indenture and those made part of the Indenture by reference to the Trust Indenture Act of 1939 (15 U.S.C. Sections 77aaa-77bbbb) (the “TIA”) as in effect on the date on which the Indenture was qualified under the TIA. Notwithstanding anything to the contrary herein, the Notes are subject to all such terms, and Holders of Notes are referred to the Indenture and the TIA for a statement of them. To the extent the terms of the Indenture and this Note are inconsistent, the terms of the Indenture shall govern.

4.    Guarantee.

The Guarantor has irrevocably, fully and unconditionally guaranteed, on an unsecured and unsubordinated basis, the full and punctual payment (whether at maturity, upon redemption or otherwise) of the principal of and interest on, and all other amounts payable under, the Notes and the full and punctual payment of all other amounts payable by the Issuer under the Indenture and any other obligations of the Issuer under the Indenture, subject to certain terms and conditions set forth in the Indenture.

5.    Denominations; Transfer; Exchange.

The Notes are in registered form, without coupons, in denominations of $2,000 and multiples of $1,000 thereafter. A Holder shall register the transfer or exchange of Notes in accordance with the Indenture. The Issuer may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and to pay certain transfer taxes or similar governmental charges payable in connection therewith as permitted by the Indenture. The Issuer need not issue, authenticate, register the transfer of or exchange any Notes or portions thereof for a period of fifteen (15) days before the mailing of a notice of redemption, nor need the Issuer register the transfer or exchange of any Note selected for redemption in whole or in part.

6.    Registration Rights

The Holder of this Note is entitled to the benefits of the Registration Rights Agreement, dated May 12, 2020, between the Issuer, the Guarantor and the Initial Purchasers named therein (the “Registration Rights Agreement”). The interest rate on this Note will increase by a rate of 0.25% per annum upon the occurrence of certain events specified in the Registration Rights Agreement for the periods specified therein.

7.    Amendment; Supplement; Waiver.

Subject to certain exceptions, the Notes and the provisions of the Indenture relating to the Notes may be amended or supplemented and any existing default or Event of Default or compliance with certain provisions may be waived with the written consent of the Holders of at least a majority in aggregate principal amount of all of the Outstanding Notes. Without notice to or consent of any Holder, the parties thereto may amend or supplement the Indenture and the Notes to, among other things, cure any ambiguity, defect or inconsistency or comply with any requirements of the Commission in connection with the qualification of the Indenture under the TIA, or make any other change that does not adversely affect the rights of any Holder of a Note in any material respect.

8.    Redemption.

Prior to February 15, 2030, the Issuer may at its option redeem any of the Notes in whole or in part at any time, each at a redemption price calculated by the Issuer equal to the greater of:

100% of the principal amount of the Notes to be redeemed; and

the sum of the present values of the remaining scheduled payments of principal and interest, including additional interest, if any, as provided under Section 6, thereon (not including any portion of such payments of interest accrued as of the date of redemption), that would be due if the notes to be redeemed matured on February 15, 2030, discounted to the date of redemption on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate (as defined below) plus 50 basis points,

plus, in each case, accrued interest thereon to the date of redemption.

Notwithstanding the foregoing, installments of interest on Notes that are due and payable on Interest Payment Dates falling on or prior to a redemption date will be payable on the Interest Payment Date to the registered Holders as of the close of business on the relevant Interest Record Date according to the Notes and the Indenture. The Trustee shall have no obligation to calculate or verify any calculation of a redemption price.

“Treasury Rate” means, the arithmetic mean (rounded to the nearest one-hundredth of one percent) of the yields displayed for each of the five most recent days published in the most recent Statistical Release under the caption “Treasury constant maturities” for the maturity (rounded to the nearest month) corresponding to the remaining life to maturity of the Notes (assuming the Notes mature on February 15, 2030) as of the date of redemption. If no maturity exactly corresponds to such remaining life to maturity, yields for the two published maturities most closely corresponding to such remaining life to maturity shall be calculated pursuant to the immediately preceding sentence and the Treasury Rate shall be interpolated or extrapolated from such yields on a straight-line basis, rounding in each of such relevant periods to the nearest month. The Treasury Rate will be calculated on the third business day preceding the date the applicable notice of redemption is given. For the purpose of calculating the Treasury Rate, the most recent Statistical Release published prior to the date of calculation of the Treasury Rate shall be used.

“Statistical Release” means that statistical release designated “H.15” or any successor publication published by the Board of Governors of the Federal Reserve System and which establishes yields on actively traded U.S. Treasury securities adjusted to constant maturity, or, if such release (or any successor publication) is no longer published at the time of any calculation under the Indenture, then such other reasonably comparable index the Issuer designates.

Notice of any redemption will be delivered electronically or mailed at least 10 days but not more than 60 days before the redemption date to each holder of the Notes to be redeemed (with a copy to the Trustee), except that redemption notices may be delivered more than 60 days prior to a redemption date if the notice is issued in connection with a defeasance of the Notes or a satisfaction and discharge of the indenture. The notice of redemption will state any conditions applicable to the redemption and the amount of the Notes of any series to be redeemed. If less than all the Notes are to be redeemed, the Trustee shall, subject to applicable law, select the Notes to be redeemed as follows: (1) if the Notes are listed on any national securities exchange, in compliance with the requirements of the principal national securities exchange on which the Notes are listed; or (2) on a pro rata basis, if the Notes are not listed on any national securities exchange (or in the case of Notes in global form, by such methods as DTC may require). Unless the Issuer defaults in payment of the redemption price, on and after the redemption date, interest will cease to accrue on the Notes or portions thereof called for redemption.

In addition, beginning on February 15, 2030, the Issuer will have the right to redeem the Notes at a price equal to 100% of the principal amount of such Notes being redeemed, plus accrued interest thereon. Notwithstanding the foregoing, installments of interest on Notes that are due and payable on Interest Payment Dates falling on or prior to the redemption date will be payable on the Interest Payment Date to the registered Holders as of the close of business on the relevant Interest Record Date according to the Notes and the Indenture. Notice of any such redemption will be delivered electronically or mailed at least 10 days but not more than 60 days before the redemption date to each Holder of the Notes to be redeemed (with a copy to the Trustee). Unless the Issuer defaults in payment of the redemption price, on and after the redemption date, interest will cease to accrue on the Notes or portions thereof called for redemption.

9.    Offer to Repurchase Upon Change of Control Triggering Event.

If a Change of Control Triggering Event (as defined below) occurs with respect to the Notes, unless the Issuer shall have exercised its right to redeem the Notes as described above, the Issuer shall be required to make an offer to each Holder of Notes to purchase all or any part (equal to $2,000 or an integral multiple of $1,000 in excess thereof) of that Holder’s Notes at a purchase price in cash equal to 101% of the aggregate principal amount thereof, plus accrued and unpaid interest, if any, to the date of purchase (subject to the right of Holders of record on the relevant record date to receive interest due on the relevant Interest Payment Date); provided that after giving effect to the purchase, any Notes that remain outstanding shall have a denomination of $2,000 and integral multiples of $1,000 above that amount.

Within 30 days following the date upon which the Change of Control Triggering Event has occurred or, at the Issuer’s option, prior to any Change of Control (as defined below), but after the public announcement of the transaction that constitutes or may constitute the Change of Control, except to the extent that the Issuer shall have exercised its right to redeem the Notes pursuant to Section 8 hereof, the Issuer shall deliver a notice (a “Change of Control Offer”) to each Holder of Notes with a copy to the Trustee describing the transaction or transactions that constitute or may constitute a Change of Control Triggering Event and offering to purchase Notes on the date specified in the notice, which date will be no earlier than 10 days nor later than 60 days from the date such notice is delivered (other than as may be required by law) (such date, the “Change of Control Payment Date”). The notice will, if delivered prior to the date of consummation of the Change of Control, state that the Change of Control Offer is conditioned on the Change of Control being consummated on or prior to the Change of Control Payment Date specified in the notice.

On each Change of Control Payment Date, the Issuer shall, to the extent lawful:

The paying agent will promptly deliver, to each Holder of Notes so tendered the payment for such Notes, and the Trustee shall promptly authenticate and deliver (or cause to be transferred by book entry) to each holder a new Note equal in principal amount to any unpurchased portion of the Notes surrendered, if any.

The Issuer shall comply, to the extent applicable, with the requirements of Rule 14(e)-1 of the Exchange Act and any other securities laws or regulations in connection with the purchase of Notes pursuant to a Change of Control Triggering Event. To the extent that the provisions of any securities laws or regulations conflict with the terms described in the Notes, the Issuer shall comply with the applicable securities laws and regulations and shall not be deemed to have breached its obligations by virtue thereof.

Holders of Notes electing to have Notes purchased pursuant to a Change of Control Offer will be required to surrender their Notes, with the form entitled “Repurchase Exercise Notice Upon a Change of Control” on the reverse of the Note completed, to the paying agent at the address specified in the notice, or transfer their Notes to the paying agent by book-entry transfer pursuant to the applicable procedures of the paying agent, prior to the close of business on the third business day prior to the Change of Control Payment Date.

The Issuer shall not be required to make a Change of Control Offer with respect to the Notes if a third party makes such an offer in the manner, at the times and otherwise in compliance with the requirements for an offer made by the Issuer and such third party purchases all Notes properly tendered and not withdrawn under its offer.

In addition, the Issuer shall not purchase any Notes if there has occurred and is continuing on the Change of Control Payment Date an Event of Default under the Indenture, other than a default in the payment of the change of control payment upon a Change of Control Triggering Event.

If Holders of not less than 95% in aggregate principal amount of the outstanding Notes validly tender and do not withdraw such Notes in a Change of Control Offer and the Issuer, or any third party making a Change of Control Offer in lieu of the Issuer, as described above, purchases all of the Notes validly tendered and not withdrawn by such Holders, the Issuer shall have the right, upon not less than 10 nor more than 60 days’ prior notice, given not more than 30 days following such purchase pursuant to the Change of Control Offer described above, to redeem all Notes that remain outstanding following such purchase at a redemption price in cash equal to 101% of the principal amount thereof, plus accrued and unpaid interest, if any, to the date of redemption (subject to the right of Holders of record on an Interest Record Date to receive interest on the relevant Interest Payment Date).

For purposes of the Change of Control Offer provisions of the Notes, the following definitions are applicable:

“Change of Control” means the occurrence of any one of the following:

the direct or indirect sale, lease, transfer, conveyance or other disposition (other than by way of merger or consolidation), in one or a series of related transactions, of all or substantially all of the Issuer’s or the Guarantor’s assets and the assets of the Issuer’s subsidiaries taken as a whole to any “person” (as that term is used in Section 13(d)(3) of the Exchange Act) other than to the Issuer or one of its subsidiaries;

the consummation of any transaction (including without limitation, any merger or consolidation) the result of which is that any “person” (as that term is used in Section 13(d)(3) of the Exchange Act) becomes the “beneficial owner” (as defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or indirectly, of more than 50% of the Guarnator’s outstanding Voting Stock, measured by voting power rather than number of shares; or

the adoption of a plan relating to the Issuer’s liquidation or dissolution.

Notwithstanding the foregoing, a transaction will not be considered to be a Change of Control if (a) the Guarantor becomes a direct or indirect wholly owned subsidiary of a holding company and (b) immediately following that transaction, (1) the direct or indirect holders of the Voting Stock of the holding company are substantially the same as the holders of the Guarantor’s Voting Stock immediately prior to that transaction or (2) no person or group is the beneficial owner, directly or indirectly, of more than 50% of the total voting power of the Voting Stock of the holding company.

“Change of Control Triggering Event” means the occurrence of both a Change of Control and a Ratings Event.

“Investment Grade” means a rating of Baa3 or better by Moody’s (or its equivalent under any successor rating category of Moody’s); a rating of BBB- or better by S&P (or its equivalent under any successor rating category of S&P); and the equivalent investment grade rating from any replacement Rating Agency or Agencies appointed by the Issuer.

“Moody’s” means Moody’s Investors Service, Inc., a subsidiary of Moody’s Corporation, and its successors.

“Rating Agency” means each of Moody’s and S&P; provided, that if either of Moody’s or S&P ceases to rate the Notes or fails to make a rating of the Notes publicly available, the Issuer shall appoint a replacement for such Rating Agency that is a “nationally recognized statistical rating organization” within the meaning of Rule 15c3-1(c)(2)(vi)(F) under the Exchange Act.

“Ratings Event” means the rating on the Notes is lowered by each of the Rating Agencies and such Notes are rated below an Investment Grade by each of the Rating Agencies on any day within the 60-day period (which 60-day period will be extended so long as the rating of the Notes is under publicly announced consideration for a possible downgrade by either of the Rating Agencies) after the earlier of (a) the occurrence of a Change of Control and (b) public notice of the occurrence of a Change of Control or the Issuer’s intention to effect a Change of Control; provided that a Ratings Event will not be deemed to have occurred in respect of a particular Change of Control (and thus will not be deemed a Ratings Event for purposes of the definition of Change of Control Triggering Event) if each Rating Agency making the reduction in rating does not publicly announce or confirm or inform the Trustee in writing at the Issuer’s request that the reduction was the result, in whole or in part, of any event or circumstance comprised of or arising as a result of, or in respect of, the Change of Control (whether or not the applicable Change of Control has occurred at the time of the Ratings Event). If any Rating Agency that provided a rating of a series of Notes on the day immediately prior to the beginning of such 60-day period (or extension thereof) is not providing a rating of such series of Notes at the end of such 60-day period (or extension thereof) for any reason, such 60-day period (or extension thereof) shall be extended an additional 30 days and, if the Issuer has not selected a replacement Rating Agency on or before the end of such 30-day period, then such Rating Agency shall be deemed to have lowered its rating of such series of Notes at the end of such 30-day period to be below an Investment Grade Rating. The Trustee shall have no obligation to monitor ratings on the Notes.

“S&P” means Standard & Poor’s Financial Services LLC, a division of S&P Global Inc., and its successors.

“Voting Stock” of any specified person as of any date means the capital stock of such person that is at the time entitled to vote generally in the election of the board of directors of such person.

10.    Defaults and Remedies.

If an Event of Default (other than certain bankruptcy Events of Default with respect to the Issuer, the Guarantor or any material subsidiary of the Issuer) under the Indenture occurs with respect to the Notes and is continuing, then the Trustee may by notice to the Issuer or, the Holders of not less than 25% in aggregate principal amount of all of the Outstanding Notes by notice in writing to the Issuer (and to the Trustee if given by Holders), require the Issuer to repay immediately the entire principal amount of all of the Outstanding Securities of all series affected, together with all accrued and unpaid interest and premium, if any. If a bankruptcy Event of Default with respect to the Issuer, the Guarantor or any material subsidiary of the Issuer occurs and is continuing, then the entire principal amount of all of the Outstanding Securities (including the Notes) will automatically become due immediately and payable without any declaration or other act on the part of the Trustee or any Holder. Holders of Notes may not enforce the Indenture, the Notes or related Guarantees except as provided in the Indenture. The Trustee is not obligated to enforce the Indenture, the Notes or related Guarantees unless it has received indemnity as it reasonably requires. The Indenture permits, subject to certain limitations therein provided, Holders of a majority in aggregate principal amount of all of the Outstanding Notes to direct the Trustee in its exercise of any trust or power. The Trustee may withhold from Holders of Notes notice of certain continuing defaults or Events of Default if it determines that withholding notice is in their interest.

11.    Authentication.

This Note shall not be valid until the Trustee manually signs the certificate of authentication on this Note.

12.    Abbreviations and Defined Terms.

Customary abbreviations may be used in the name of a Holder of a Note or an assignee, such as: TEN COM (= tenants in common), TEN ENT (= tenants by the entireties), JT TEN (= joint tenants with right of survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts to Minors Act).

13.    CUSIP Numbers.

Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Issuer has caused CUSIP numbers to be printed on the Notes as a convenience to the Holders of the Notes. No representation is made as to the accuracy of such numbers as printed on the Notes and reliance may be placed only on the other identification numbers printed hereon.

14.    Governing Law.

The laws of the State of New York shall govern the Indenture, including the Guarantee, and this Note thereof.

To assign this Note, fill in the form below:

I or we assign and transfer this Note to

(Print or type assignee’s name, address and zip code)

(Insert assignee’s soc. sec. or tax I.D. No.)

and irrevocably appoint agent to transfer this Note on the books of the Issuer. The agent may substitute another to act for him.

Date: __________________ Your Signature: ____________________________

Sign exactly as your name appears on the other side of this Note.

In connection with any transfer of any of the Notes evidenced by this certificate occurring prior to the expiration of the period referred to in Rule 144(d) under the Securities Act of 1933, as amended (the “Securities Act”) after the later of the date of original issuance of such Notes and the last date, if any, on which such Notes were owned by the Issuer or any “Affiliate” of the Issuer within the meaning of Rule 144 of the Securities Act , the undersigned confirms that such Notes are being transferred in accordance with its terms:

CHECK ONE BOX BELOW

Unless one of the boxes is checked, the Trustee will refuse to register any of the Notes evidenced by this certificate in the name of any person other than the registered holder thereof; provided, however, that if box (5), (6) or (7) is checked, the Trustee shall be entitled to require, prior to registering any such transfer of the Notes, such legal opinions, certifications and other information as the Issuer has reasonably requested to confirm that such transfer is being made pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act, such as the exemption provided by Rule 144 under such Act.

Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Registrar, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Registrar in addition to, or in substitution for, STAMP, all in accordance with the United States Securities Exchange Act of 1934, as amended.

TO BE COMPLETED BY TRANSFEROR IF (4) ABOVE IS CHECKED.

The undersigned represents and warrants that the requested transfer is being made (A) to a Person who the undersigned reasonably believes is a “qualified institutional buyer” within the meaning of Rule 144A under the Securities Act (a “QIB”), (B) to a Person who is purchasing for its own account or the account of a QIB in a transaction meeting the requirement of Rule 144A and (C) in accordance with all applicable securities laws of the states of the United States and other jurisdictions.

The following exchanges of a part of this Global Note for Physical Notes or a part of another Global Note have been made:

To: Leidos, Inc.

The undersigned registered owner of this Security hereby acknowledges receipt of a notice from Leidos, Inc. (the “Issuer”) as to the occurrence of a Change of Control Triggering Event with respect to the Issuer and hereby directs the Issuer to pay, or cause the Trustee to pay, _____________________ an amount in cash equal to 101% of the aggregate principal amount of the Notes, or the portion thereof (which is a multiple of $1,000, provided that the remaining principal amount, if any, following such repurchase shall be at least $2,000 or a multiple of $1,000 in excess thereof) below designated, to be repurchased plus interest accrued to, but excluding, the repurchase date, except as provided in the Indenture.

Dated: _________

Signature ___________________

Principal amount to be repurchased (a multiple of $1,000): _________

Remaining principal amount following such repurchase: _________
(zero or at least $2,000 or a multiple of $1,000 in excess thereof)