Document:

EX-10.5

 Exhibit 10.5 

TAX MATTERS AGREEMENT 

THIS TAX MATTERS AGREEMENT (this “Agreement”), dated on or about July 20, 2015, and effective as of the Effective Date,
is by and among SecureWorks Holding Corporation, for itself and its Subsidiaries (“Spyglass”), and Denali Holding Inc., for itself and its Subsidiaries other than Spyglass (“Dell”) (each a “Party”
and collectively, the “Parties”). 
 RECITALS 

WHEREAS, the Parties intend that Spyglass will issue and sell in a registered public offering up to twenty percent (20%) of the
post-offering outstanding common stock of Spyglass (“Spyglass Common Stock”), and thereby become a public company (“IPO”); 

WHEREAS, Denali Holding Inc. is the common parent corporation of an “affiliated group” of corporations within the meaning of
Section 1504(a) of the Internal Revenue Code of 1986, as amended (the “Code”), and of certain combined groups as defined under similar laws of other jurisdictions, and Spyglass and the Spyglass Affiliates are, as of the date
hereof, and have been, members of such groups; 
 WHEREAS, the groups of which Denali Holding Inc. is the common parent and Spyglass and the
Spyglass Affiliates are members file and/or intend to file Consolidated Returns and Combined Returns (each as defined below); and 

WHEREAS, Dell and Spyglass desire to set forth their agreement regarding the allocation of Taxes (as defined below), the filing of Tax Returns
(as defined below), the administration of Audits (as defined below) and other related matters after completion of the IPO. 
 NOW,
THEREFORE, in consideration of the mutual covenants and promises contained herein, the receipt and sufficiency of which are hereby acknowledged, the Parties agree as follows: 

ARTICLE I 
 Defined
Terms 
 For purposes of this Agreement, the following terms have the following meanings: 

“Aggregate Spyglass Group Combined Tax Liability” means, with respect to any taxable period, the sum of the Spyglass Group
Combined Tax Liability for each Combined Return for such taxable period. 
 “Audit” includes any audit, assessment of
Taxes, other examination by any Tax Authority, proceeding, or appeal of such proceeding relating to Taxes, whether administrative or judicial. 

“Combined Group” means a group of corporations or other entities that files a Combined Return. 

“Combined Return” means any Tax Return with respect to Non-Federal Taxes filed on a consolidated, combined (including nexus
combination, worldwide combination, domestic combination, line of business combination or any other form of combination) or unitary basis wherein one or more members of the Spyglass Group join in the filing of a Tax Return with Dell or a Dell
Affiliate that is not also a member of the Spyglass Group. 

  

 “Consolidated Group” means the affiliated group of corporations within the
meaning of Section 1504(a) of the Code of which Denali Holding Inc. is the common parent and which includes the Spyglass Group. 

“Consolidated Return” means any Tax Return with respect to Federal Income Taxes filed by the Consolidated Group pursuant to
Section 1501 of the Code. 
 “Deconsolidation” means any event pursuant to which Spyglass and the Spyglass Group cease
to be includible in either the Consolidated Group or any Combined Group, as the context requires. 
 “Deconsolidation Date”
means the close of business on the day on which a Deconsolidation occurs. 
 “Dell Affiliate” means any corporation or
other entity, including any entity that is disregarded for federal income tax purposes, directly or indirectly “controlled” by Denali Holding Inc. where “control” means the ownership of fifty percent (50%) or more of the
ownership interests of such corporation or other entity (by vote or value) or the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of such corporation or other entity, but at all times
excluding Spyglass and any Spyglass Affiliate. 
 “Dell Business” means all of the businesses and operations conducted by
Dell and Dell Affiliates, excluding the Spyglass Business, at any time, whether prior to or after the date of the IPO. 
 “Dell
Group” means Dell and each Dell Affiliate. 
 “Effective Date” means August 1, 2015, at 1 AM Central Daylight
Time. 
 “Employee Matters Agreement” means the employee matters agreement to be entered into by and among the Parties on
or about July 20, 2015. 
 “Estimated Tax Installment Date” means the installment due dates prescribed in
Section 6655(c) of the Code (presently May 15, July 15, October 15 and January 15). 
 “Federal
Income Tax” or “Federal Income Taxes” means any Tax imposed under Subtitle A of the Code (including the Taxes imposed by Sections 11, 55, 59A, and 1201(a) of the Code), and any other income based United States Federal Tax
which is hereinafter imposed upon corporations. 
 “Federal Tax” means any Tax imposed under the Code or otherwise under
United States federal Tax law. 
 “Final Determination” means (a) the final resolution of any Tax (or other matter)
for a taxable period, including any related interest or penalties, that, under applicable law, is not subject to further appeal, review or modification through proceedings or otherwise, including (i) by the expiration of a statute of
limitations (giving effect to any extension, waiver or mitigation thereof) or a period for the filing of claims for refunds, amended returns, appeals from adverse determinations, or recovering any refund (including by offset), (ii) by a
decision, judgment, decree, or other order by a court of competent jurisdiction, which has become final and unappealable, (iii) by a closing agreement or an accepted offer in compromise under Section 7121 or 7122 of the Code, or comparable
agreements under laws of other jurisdictions, (iv) by execution of an IRS Form 870-AD, or by a comparable form under the laws of other jurisdictions (excluding, however, any such form that reserves (whether by its terms or by operation of law)
the right of the taxpayer to file a claim for refund and/or the right of the Tax Authority to assert a 

  
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further deficiency), or (v) by any allowance of a refund or credit, but only after the expiration of all periods during which such refund or credit may be recovered (including by way of
offset) or (b) the payment of Tax by any member of the Consolidated Group or Combined Group with respect to any item disallowed or adjusted by a Tax Authority provided that Dell determines that no action should be taken to recoup such payment.

 “IRS” means the Internal Revenue Service. 

“Loss” means any loss, cost, fine, penalty, fee, damage, obligation, liability, payment in settlement, or other expense of
any kind, including reasonable attorneys’ fees and costs, but excluding any consequential, special, punitive or exemplary damages. 

“Non-Federal Combined Taxes” means any Non-Federal Taxes with respect to which a Combined Return is filed. 

“Non-Federal Separate Taxes” means any Non-Federal Taxes that are not Non-Federal Combined Taxes. 

“Non-Federal Taxes” means any Tax other than a Federal Tax. 

“Option Issuances” has the meaning set forth in Section 4.02(c). 

“Person” means an individual, sole proprietorship, partnership, limited partnership, limited liability partnership,
corporation, limited liability company, business trust, joint stock company, trust, unincorporated association, joint venture or other similar entity or organization, including a government or political subdivision, department or agency of a
government (whether or not having a separate legal personality). 
 “Post-Deconsolidation Period” means a taxable period
beginning after the applicable Deconsolidation Date. 
 “Post-IPO Spyglass Tax Asset” means any Tax Asset of the Spyglass
Group (a) existing at the end of the taxable period treated under Section 3.05(c) as ending on the Effective Date or (b) generated in taxable periods beginning after the Effective Date (including the period treated as beginning
on the day after the Effective Date pursuant to Section 3.05(c)), in each case, as determined under Section 3.05 or Section 3.06, except to the extent that such Tax Asset is used to reduce the Spyglass Group
Federal Income Tax Liability or Spyglass Group Combined Tax Liability. 
 “Pre-Deconsolidation Period” means any taxable
period beginning on or prior to the applicable Deconsolidation Date. 
 “Pro Forma Spyglass Group Combined Return” means a
pro forma Combined Return or other schedule prepared pursuant to Section 3.06. 
 “Pro Forma Spyglass Group Consolidated
Return” means a pro forma Consolidated Return prepared pursuant to Section 3.05(b). 
 “Redetermination
Amount” means, with respect to any Consolidated Return or Combined Return for a taxable period, the amount determined under Section 3.09. 

  
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 “Shared Services Agreement” means the shared services agreement to be entered
into by and among the Parties on or about July 20, 2015. 
 “Spyglass Affiliate” means any corporation or other
entity, including any entity that is a disregarded entity for federal income tax purposes, directly or indirectly “controlled” by Spyglass where “control” means the ownership of fifty percent (50%) or more of the ownership
interests of such corporation or other entity (by vote or value) or the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of such corporation or other entity. 

“Spyglass Business” means the business of (a) providing (i) information and network managed security services,
(ii) information and network security and risk consulting, (iii) security incident response services, and (iv) security-related regulatory compliance solutions, and (b) researching and developing responses to cyber security
threats, in each case as conducted as of the Effective Date by Spyglass or any Spyglass Subsidiary. 
 “Spyglass Group”
means the affiliated group of corporations, including any entity that is a disregarded entity for federal income tax purposes, as defined in Section 1504(a) of the Code, or similar group of entities as defined under similar laws of other
jurisdictions, of which Spyglass Holding Corporation would be the common parent if it were not a subsidiary of Denali Holding Inc., and any corporation or other entity, including any entity that is a disregarded entity for federal income tax
purposes, which may be or become a member of such group from time to time. 
 “Spyglass Group Combined Tax Liability”
means, with respect to any taxable period, the Spyglass Group’s liability for Non-Federal Combined Taxes as determined under Section 3.06. 

“Spyglass Group Federal Income Tax Liability” means, with respect to any taxable period, the Spyglass Group’s liability
for Federal Income Taxes as determined under Section 3.05. 
 “Spyglass Pro Forma Return” means a Pro Forma
Spyglass Group Consolidated Return or a Pro Forma Spyglass Group Combined Return. 
 “Spyglass Subsidiary” means any
Subsidiary of Spyglass Holding Corporation. 
 “Subsidiary” means, with respect to any Party (the “parent”),
(a) any corporation, limited liability company, partnership, association or other entity the accounts of which would be consolidated with those of the parent in the parent’s consolidated financial statements if such financial statements
were prepared in accordance with GAAP, as well as (b) any other corporation, limited liability company, partnership, association or other entity of which securities or other ownership interests representing more than fifty percent (50%) of
the equity or more than fifty percent (50%) of the ordinary voting power or, in the case of a partnership, more than fifty percent (50%) of the general partnership interests are, as of such date, owned, controlled or held by the parent or
one or more subsidiaries of the parent. 
 “Tax” or “Taxes” means any taxes, charges, fees, levies,
imposts, duties, or other assessments of a similar nature, including without limitation, income, alternative or add-on minimum, gross receipts, excise, employment, sales, use, transfer, license, payroll, franchise, severance, stamp, occupation,
windfall profits, withholding, social security, unemployment, disability, ad valorem, estimated, highway use, commercial rent, capital stock, paid up capital, recording, registration, property, real property gains, value added, business license,
custom duties, or other tax, imposed or required to be withheld by any Tax Authority including any interest, additions to Tax, or penalties applicable thereto. 

  
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 “Tax Asset” means any net operating loss, net capital loss, investment tax
credit, foreign tax credit, charitable deduction or any other deduction, credit or tax attribute which could reduce Taxes (including without limitation deductions and credits related to alternative minimum taxes). 

“Tax Authority” includes the IRS and any foreign, state, local, or other governmental authority responsible for the
administration of any Taxes. 
 “Tax Counsel” means a nationally recognized law firm or accounting firm with a reputable
Tax practice selected to provide a Tax Opinion. 
 “Tax Item” means any item of income, gain, loss, deduction, expense or
credit, or other attribute that may have the effect of increasing or decreasing any Tax. 
 “Tax Return” or “Tax
Returns” means any return, declaration, statement, report, schedule, certificate, form, information return or any other document (and any related or supporting information) including an amended tax return required to be supplied to, or
filed with, a Tax Authority with respect to Taxes. 
 “Third Party” means a Person other than a Party. 

ARTICLE II 
 Preparation
and Filing of Tax Returns 
 Section 2.01 In General. 

(a) Dell shall have the sole and exclusive responsibility for the preparation and filing of any Consolidated Return or Combined Return. 

(b) Spyglass shall, subject to Section 2.02 and except as provided in the Employee Matters Agreement or the Shared Services
Agreement, be responsible for preparing and filing all Tax Returns of Spyglass and the Spyglass Affiliates other than those described in Section 2.01(a). 

(c) Unless otherwise required by a Final Determination, and except as the Parties may agree in an instrument in writing signed on behalf of
each of the Parties, Dell and Spyglass, for the Dell Group and the Spyglass Group, respectively, agree to file all Tax Returns, and to take all other actions, relating to Federal Income Taxes or Non-Federal Combined Taxes in a manner consistent with
the position that Spyglass and the Spyglass Group are includible in the Consolidated Group and any applicable Combined Group for all days from the date hereof through and including the Deconsolidation Date. 

Section 2.02 Preparation and Filing of Returns. 

(a) All Tax Returns filed after the Effective Date by Dell, any Dell Affiliate, Spyglass, or any Spyglass Affiliate shall (i) be prepared
in a manner that is consistent with this Section 2.02 and the Code, and (ii) filed on a timely basis (taking into account applicable extensions) by the party responsible for such filing under Section 2.01. 

(b) In its sole discretion, Dell shall have the exclusive right with respect to any Consolidated Return or Combined Return: (i) to
determine (1) the manner in which such Tax Return shall be prepared and filed, including, without limitation, the manner in which any Tax Items shall be reported, 

  
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(2) whether any extensions may be requested, (3) the elections that will be made by any member of the Consolidated Group or applicable Combined Group, and (4) whether any amended Tax
Returns should be filed; (ii) to control, contest, and represent the interests of the Consolidated Group and any Combined Group in any Audit and to resolve, settle, or agree to any adjustment or deficiency proposed, asserted or assessed as a
result of any Audit; (iii) to file, prosecute, compromise or settle any claim for refund; and (iv) to determine whether any refunds, to which the Consolidated Group or applicable Combined Group may be entitled, shall be paid by way of
refund or credited against the Tax liability of the Consolidated Group or applicable Combined Group. At least thirty (30) days prior to the due date (taking into account any extensions) for the filing of any Consolidated Return or Combined
Return for any taxable period, Dell shall provide to Spyglass a copy of the Pro Forma Spyglass Group Consolidated Return or the Pro Forma Spyglass Group Combined Return, as applicable, for such taxable period (including copies of all worksheets and
other materials used in preparation thereof) for Spyglass’s review and comment. Spyglass shall provide its comments to Dell within twenty (20) days after receipt of such Pro Forma Spyglass Group Consolidated Return or Pro Forma Spyglass
Group Combined Return, as applicable, and Dell and Spyglass shall attempt in good faith to resolve any dispute with respect to such returns. In the case of a dispute regarding the reporting of any Tax Item on any Spyglass Pro Forma Return or the
requesting of a change of method of accounting which would solely impact Spyglass or Spyglass Affiliates, which the parties cannot resolve, Dell and Spyglass shall jointly retain a nationally recognized accounting firm that is mutually agreed upon
by Spyglass and Dell (the “Independent Accountant”) to determine whether the proposed reporting of Spyglass or Dell is more appropriate. If Spyglass and Dell are unable to agree, the Independent Accountant shall be KPMG. The
relevant Tax Item shall be reported in the manner that the Independent Accountant determines is more appropriate, and such determination shall be final and binding on Spyglass and Dell. If Spyglass has not provided its comments on the applicable
Spyglass Pro Forma Return, or in the case of a dispute regarding the reporting of any Tax Item, such dispute has not been resolved by the due date (with applicable extension) for the filing of any Consolidated Return or Combined Return, Dell shall
file such Consolidated Return or Combined Return reporting all Tax Items in the manner as originally set forth on the applicable Spyglass Pro Forma Return provided to Spyglass; provided, however, that Dell agrees that it will
thereafter file an amended Consolidated Return or Combined Return, if necessary and material, reporting any disputed Tax Item in the manner determined by the Independent Accountant, and any other Tax Item as agreed upon by Spyglass and Dell. The
fees and expenses incurred in retaining the Independent Accountant shall be borne equally by Spyglass and Dell, except that if the Independent Accountant determines that the proposed reporting of the disputed Tax Item(s) submitted to the Independent
Accountant for its determination by a party is frivolous, has not been asserted in good faith or is not supported by substantial authority, one hundred percent (100%) of the fees and expenses of the Independent Accountant shall be borne by such
party. Subject to the other applicable provisions in this Agreement, Spyglass, for itself and its subsidiaries, hereby irrevocably appoints Dell as its agent and attorney-in-fact to take such action (including the execution of documents) as Dell may
deem appropriate to effect the foregoing. 
 Section 2.03 Furnishing Information. Spyglass (or the applicable Spyglass
Affiliate) shall: (a) furnish to Dell in a timely manner such information and documents as Dell may reasonably request for purposes of (i) preparing any original or amended Consolidated Return or Combined Return, (ii) contesting or
defending any Audit relating to a Consolidated Return or a Combined Return, and (iii) making any determination or computation necessary or appropriate under this Agreement; (b) cooperate in any Audit of any Consolidated Return or Combined
Return; and (c) retain and provide on demand books, records, documentation or other information relating to any Tax Return until the later of (i) the expiration of the applicable statute of limitations (giving effect to any extension,
waiver, or mitigation thereof) and (ii) in the event any claim is made under this Agreement for which such information is relevant, until a Final Determination with respect to such claim. Dell shall provide Spyglass (or the applicable Spyglass
Affiliate) any assistance reasonably required in providing any information requested pursuant to this Section 2.03. Spyglass shall comply with clause (a)(i) of this Section 2.03 by timely 

  
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providing, in accordance with Dell’s internal tax return calendar (which will be provided to Spyglass on a rolling one-year schedule) and Dell’s prescribed format, all information
pertaining to Spyglass that is necessary for Dell to prepare all Consolidated Returns and Combined Returns and compute all estimated Tax payments hereunder. If Spyglass does not meet these deadlines, the Section 2.02(b) notice period to
Spyglass shall be waived. 
 Section 2.04 Expenses. Spyglass shall reimburse Dell for any outside legal and accounting expenses
incurred by Dell in the course of the conduct of any Audit regarding the Tax liability of the Consolidated Group or any Combined Group, and for any other expense incurred by Dell in the course of any litigation relating thereto, to the extent such
costs are directly related to Spyglass or any Spyglass Affiliate and provided Dell has conferred with Spyglass as to the portion of the Audit relating to Spyglass or the Spyglass Affiliate. The right to control, contest, represent, file, prosecute,
challenge or settle any Audit for any Consolidated Return or Combined Return shall be in accordance with Section 2.02. 

ARTICLE III 
 Payment of
Taxes and Tax Sharing Amounts 
 Section 3.01 Federal Income Taxes. Dell shall pay (or cause to be paid) to the IRS all
Federal Income Taxes, if any, of the Consolidated Group. 
 Section 3.02 Non-Federal Combined Taxes. Dell shall pay (or cause to
be paid) to the appropriate Tax Authorities all Non-Federal Combined Taxes, if any, of any Combined Group. 
 Section 3.03
Non-Federal Separate Taxes and Other Taxes. Spyglass shall pay (or cause to be paid) to the appropriate Tax Authorities all Non-Federal Separate Taxes and any other Taxes (other than those described in Section 3.01 and
Section 3.02), if any, of Spyglass and the Spyglass Affiliates; provided that, in lieu of the foregoing, the Parties may agree that Dell shall pay (or cause to be paid) to the appropriate Tax Authorities such Non-Federal Separate Taxes
and any other Taxes of Spyglass and the Spyglass Affiliates, in which case Spyglass shall reimburse Dell in full for the amount of such Non-Federal Separate Taxes and any other Taxes within thirty (30) business days after the payment by Dell
thereof. 
 Section 3.04 Spyglass Liability for Federal Income Taxes and Non-Federal Combined Taxes. For each taxable period
beginning after the Effective Date relating to a Pre-Deconsolidation Period, Spyglass shall pay to Dell an amount equal to the sum of the Spyglass Group Federal Income Tax Liability and the Aggregate Spyglass Group Combined Tax Liability for such
period. 
 Section 3.05 Spyglass Group Federal Income Tax Liability. Subject in each case to Section 2.02(b): 

(a) In General. The Spyglass Group Federal Income Tax Liability with respect to any Consolidated Return for a taxable period shall be
the Spyglass Group’s liability for Federal Income Taxes as determined on a Pro Forma Spyglass Group Consolidated Return prepared in accordance with Section 3.05(b). For the avoidance of doubt, the Spyglass Group Federal Income Tax
Liability with respect to any Consolidated Return shall not be less than zero. 
 (b) Pro Forma Federal Return. For each Consolidated
Return, Dell shall prepare or cause to be prepared (and, as requested by Dell, Spyglass shall cooperate in preparing) a Pro Forma Spyglass Group Consolidated Return as if the Spyglass Group were not and never were part of the

  
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Consolidated Group, but rather were a separate affiliated group of corporations of which Spyglass Holding Corporation were the common parent filing a consolidated federal income tax return
pursuant to Section 1501 of the Code. For purposes of this Section 3.05(b), the Spyglass Group’s Federal Income Tax Liability shall (i) be determined for the taxable year including the Deconsolidation Date assuming the
taxable year ends on the Deconsolidation Date, (ii) not be reduced by the Spyglass Group’s carrybacks and carryovers of federal Tax Assets from other taxable periods (such items being addressed by Section 3.05(d) herein), and
(iii) exclude the Tax consequences of the IPO, including any Tax consequences from the transfer or other movement of assets between the Dell Group and the Spyglass Group. 

(c) Year of IPO. Unless the Effective Date occurs on the last day of any taxable year of Dell, for purposes of this Agreement, the
taxable year that includes the Effective Date shall be treated as if it were comprised of two taxable periods, one of which ends on the Effective Date and one of which begins on the day after the Effective Date. For purposes of computing the Federal
Taxes attributable to each period of the taxable year, the amount of any item that is taken into account only once for each taxable year (e.g., the benefit of graduated tax rates, exemption amounts) shall be allocated between the two portions of the
year in proportion to the number of days in each portion. To the extent needed under this Agreement, the Spyglass Group Federal Income Tax Liability shall be determined separately for each period. 

(d) Federal Tax Assets. Dell shall pay to Spyglass the amount, if any, by which one or more federal Post-IPO Spyglass Tax Assets
reduces the Federal Income Tax liability of the Consolidated Group for any taxable period. Dell shall make such payment to Spyglass not later than thirty (30) business days after Dell files a Tax Return giving effect to such reduction in
Federal Income Tax liability with any Tax Authority pursuant to this Article III. For purposes of computing the amount of the payment described in this Section 3.05(d), (i) in the case of any Tax Asset that is a loss or
deduction (such as a net operating loss or net capital loss), such amount shall be equal to the product of (A) the amount of such loss or deduction that is utilized (through a reduction in the Federal Income Tax liability of the Consolidated
Group) on the applicable Consolidated Return, and (B) the highest marginal federal income tax rate applicable to the Consolidated Group for the relevant tax period, (ii) in the case of any Tax Asset that is a credit, such amount shall be
equal to the amount of such credit that is utilized on the applicable Consolidated Return, and (iii) in the case of any other Tax Asset, such amount shall be determined by Dell acting reasonably and in good faith. 

Section 3.06 Spyglass Group Combined Tax Liability. Subject in each case to Section 2.02(b): 

(a) In General. The Spyglass Group Combined Tax Liability with respect to any Combined Return for a taxable period shall be the
Spyglass Group’s liability for Non-Federal Combined Tax as determined on a Pro Forma Spyglass Group Combined Return prepared in a manner consistent with the principles and procedures set forth in Section 3.05(b) and
Section 3.05(c) hereof. For the avoidance of doubt, the Spyglass Group Combined Tax Liability with respect to any Combined Return shall not be less than zero. 

(b) Non-Federal Tax Assets. Dell shall pay to Spyglass the amount, if any, by which one or more non-federal Post-IPO Spyglass Tax
Assets reduces the Non-Federal Combined Tax liability of the applicable Combined Group for any taxable period. Dell shall make such payment to Spyglass not later than thirty (30) business days after Dell files a Tax Return giving effect to such
reduction in Non-Federal Combined Tax liability with any Tax Authority pursuant to this Article III. For purposes of computing the amount of the payment described in this Section 3.06(b), (i) in the case of any Tax Asset that
is a loss or deduction (such as a net operating loss or net capital loss), such amount shall be equal to the product of (A) the amount of such loss or deduction that is utilized (through a reduction in the Non-Federal Combined Tax liability of
the Combined Group) on the applicable Combined Return, and (B) the 

  
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highest marginal income tax rate applicable to the Combined Group in the relevant taxing jurisdiction for the relevant tax period, (ii) in the case of any Tax Asset that is a credit, such
amount shall be equal to the amount of such credit that is utilized on the applicable Combined Return, and (iii) in the case of any other Tax Asset, such amount shall be determined by Dell acting reasonably and in good faith. 

Section 3.07 Tax Sharing Installment Payments. 

(a) Federal Income Taxes. Not later than ten (10) business days prior to each Estimated Tax Installment Date following the date
hereof with respect to a Pre-Deconsolidation Period, Dell shall determine under Section 6655 of the Code the estimated amount of the related installment of the Spyglass Group Federal Income Tax Liability for the taxable period. Spyglass shall
then pay to Dell, not later than such Estimated Tax Installment Date, the amount thus determined. 
 (b) Non-Federal Combined Taxes.
Not later than two (2) business days prior to any estimated tax installment date following the date hereof with respect to a Combined Return for a Pre-Deconsolidation Period, Dell shall determine the estimated amount of the related installment
of the Spyglass Group Combined Tax Liability for the taxable period. Spyglass shall pay to Dell, not later than the due date for such installment, the amount thus determined. 

Section 3.08 Tax Sharing True-Up Payments. 

(a) Federal Income Taxes. Not later than thirty (30) business days after the filing of a Consolidated Return, Spyglass shall pay
to Dell, or Dell shall pay to Spyglass, as appropriate, an amount equal to the difference, if any, between the Spyglass Group Federal Income Tax Liability for such taxable period and the aggregate amount paid by Spyglass with respect to such taxable
period under Section 3.07(a). 
 (b) Non-Federal Combined Taxes. Not later than thirty (30) business days following
filing of a Combined Return, Spyglass shall pay to Dell, or Dell shall pay to Spyglass, as appropriate, an amount equal to the difference, if any, between the Spyglass Group Combined Tax Liability for such taxable period and the amount paid by
Spyglass with respect to such taxable period under Section 3.07(b). 
 Section 3.09 Redetermination Amount. 

(a) In General. In the event of any redetermination of any Tax Item of any member of the Consolidated Group or any Combined Group as a
result of a Final Determination or any settlement or compromise with any Tax Authority (including any amended Tax Return or claim for refund filed by Dell), Spyglass shall pay Dell or Dell shall pay Spyglass, as the case may be, the absolute value
of the Redetermination Amount with respect to each Consolidated Return or Combined Return affected by such redetermination, in the manner provided in Section 3.09(d). 

(b) Computation. For each Consolidated Return or Combined Return for which there is a redetermination, the Redetermination Amount shall
be (i) the Spyglass Group Federal Income Tax Liability or Spyglass Group Combined Tax liability, as applicable, with respect to such Tax Return as determined under Article III taking the redetermination into account minus (ii) the
Spyglass Group Federal Income Tax Liability or Spyglass Group Combined Tax Liability, as applicable, with respect to such Tax Return as determined under Article III without taking the redetermination into account. If the Redetermination
Amount is positive, Spyglass shall pay Dell the Redetermination Amount in the manner provided in Section 3.09(d). If the Redetermination Amount is negative, Dell shall pay Spyglass the absolute value of the Redetermination Amount in the
manner provided in Section 3.09(d). The applicable party also shall pay interest on the Redetermination Amount for each day that payment of the Tax or 

  
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refund, as applicable, would be overdue for such Tax Return calculated (i) with respect to redeterminations affecting Federal Income Taxes, at the rate determined, in the case of payment by
Spyglass to Dell, under Section 6621(a)(2) of the Code and, in the case of payment by Dell to Spyglass, under Section 6621(a)(1) of the Code, and (ii) with respect to redeterminations affecting Non-Federal Combined Taxes, under
similar laws, if any, of the applicable jurisdictions. 
 (c) Tax Assets. If a redetermination results in an additional Tax Asset of
the Spyglass Group that does not reduce any Spyglass Group Federal Income Tax Liability or Spyglass Group Combined Tax Liability, then Dell shall pay Spyglass, at the time such Tax Asset is used, the amount by which such additional Tax Asset reduces
the Federal Income Tax liability or non-Federal Income Tax liability of the Consolidated Group or Combined Group, as applicable, in accordance with the principles set forth in Section 3.05(d) and Section 3.06(b) (to the
extent no payment is required for such Tax Asset under such sections). 
 (d) Payment. Dell shall deliver to Spyglass a schedule
reflecting the computation of any Redetermination Amount. Not later than thirty (30) business days after the date such schedule is delivered, Spyglass shall pay Dell, or Dell shall pay Spyglass, as applicable, the absolute value of the
Redetermination Amount. 
 (e) Year of the IPO. Consistent with Section 3.05(c), unless the Effective Date occurs on the
last day of any taxable year of Dell, if there is a redetermination that affects a Consolidated Return or Combined Return for the taxable year that includes the Effective Date, the Redetermination Amount shall be determined separately for the
taxable period ending on the Effective Date and the taxable period beginning on the day after the Effective Date. 
 Section 3.10
Interest. Payments under this Article III that are not made within the prescribed period shall thereafter bear interest at the Federal short-term rate established pursuant to Section 6621 of the Code (or a rate established under
an equivalent provision of foreign Law, as appropriate). 
 Section 3.11 Carrybacks. In the event any Tax Asset of the Spyglass
Group for any Post-Deconsolidation Period is eligible to be carried back to a Pre-Deconsolidation Period, Spyglass shall, to the extent permitted by applicable law, elect to carry such amounts forward to any Post-Deconsolidation Period. If Spyglass
is required by law to carry back any such Tax Asset to a Pre-Deconsolidation Period, Dell agrees to make a payment to Spyglass to the extent that such a payment would otherwise be required under the terms of Section 3.05(d) or
Section 3.06(b), net of any expenses incurred by Dell or Dell Affiliates. If subsequent to the payment by Dell to Spyglass of any such amount, there shall be (a) a Final Determination which results in a disallowance or a reduction
of the Tax Asset so carried back or (b) a reduction in the amount of the benefit realized by the Dell Group for any reason, Spyglass shall repay to Dell, within thirty (30) business days of such event, any amount which would not have been
payable to Spyglass pursuant to this Section 3.11 had the amount of the benefit been determined in light of these events. Spyglass shall hold Dell harmless for any penalty, addition to Tax or interest payable by any member of the Dell
Group as a result of any such event. Any such amount shall be paid by Spyglass to Dell within thirty (30) business days of the payment by Dell or any member of the Consolidated Group or Combined Group of any such penalty, addition to Tax, or
interest. 
 Section 3.12 Employee Compensation. All liabilities related to the compensation of employees of the Spyglass Group
shall be allocated between the Dell Group and the Spyglass Group pursuant to the Employee Matters Agreement. Dell and Spyglass shall cooperate in determining how the accrual or payment of such liabilities shall be reported for Tax purposes and how
the applicable deductions shall be allocated. 

  
 10 

 ARTICLE IV 

Certain Additional Covenants and Indemnification 

Section 4.01 Continuing Covenants. Spyglass, for itself and the Spyglass Affiliates, agrees that, except as required by law, on or
after a Deconsolidation, without the prior written consent of Dell (which shall not be unreasonably withheld, delayed or conditioned), it will not (nor will it cause or permit any member of the Spyglass Group to), in respect of any
Pre-Deconsolidation Period, (a) make or change any tax election in any material respect, (b) change any accounting method in any material respect, (c) amend any Tax Return or take any Tax position on any Tax Return that is materially
inconsistent with any Tax position on any Tax Return of the Dell Group, or (d) take any action, omit to take any action or enter into any transaction, in each case if doing so would result in any materially increased Tax liability or material
reduction of any Tax Asset of the Dell Group. 
 Section 4.02 Spyglass Restrictions. Spyglass agrees that, without the prior
written consent of Dell, it will not (a) issue any stock of Spyglass (or any instrument that is convertible, exercisable or exchangeable into any such stock or that may be treated as equity for tax purposes) or (b) effect any other action
that would, or would reasonably be expected to, (i) cause Dell to own stock of Spyglass that on a fully diluted basis, does not constitute “control” (within the meaning of Section 368(c) of the Code) of Spyglass or
(ii) cause a Deconsolidation. 
 Section 4.03 Indemnity. 

(a) Dell Indemnification. Dell shall be liable for and shall indemnify, defend and hold harmless Spyglass and each Spyglass Affiliate
and each of their respective representatives and each of the heirs, executors, successors and assigns of any of the foregoing from and against: 

(1) all liability as a result of Treasury Regulation §1.1502-6 for Federal Taxes or of any comparable provision for Non-Federal Taxes of
any person which is or has ever been affiliated with Dell or any Dell Affiliate or with which Dell or any Dell Affiliate joins or has ever joined (or is or has ever been required to join) in filing any consolidated, combined or unitary income Tax
Return for any taxable period ending on or before the Deconsolidation Date except to the extent the Spyglass Group is liable for such Taxes pursuant to Section 4.03(b); 

(2) all Taxes for any tax period (whether beginning before, on or after the Deconsolidation Date), and any other Losses, attributable to the
breach by Dell or any Dell Affiliate of any representation, warranty, covenant or obligation under this Agreement; and 
 (3) any
Redetermination Amount payable by Dell pursuant to the terms of Section 3.9 hereof. 
 (b) Spyglass’s
Indemnification. Spyglass shall be liable for and shall indemnify, defend and hold harmless Dell and each Dell Affiliate and each of their respective representatives and each of the heirs, executors, successors and assigns of any of the
foregoing from and against: 
 (1) all Taxes for any tax period (whether beginning before, on or after the Deconsolidation Date), and any
other Losses, attributable to the breach by Spyglass or any Spyglass Affiliate of any representation, warranty, covenant or obligation under this Agreement; and 

(2) any Redetermination Amount payable by Spyglass pursuant to the terms of Section 3.9 hereof. 

(c) Treatment of Payments. Unless otherwise required by any Final Determination, the Parties agree that any payments made by one party
to another party pursuant to this Agreement after the Deconsolidation Date shall, to the extent permissible under applicable law, be treated for all Tax and financial accounting purposes as contributions or distributions, as appropriate, made
immediately prior to the Deconsolidation Date. If it is determined that the receipt or accrual of any payment is subject to Tax, such payment shall be increased so that the amount of such increased payment reduced by the amount of all Taxes payable
with respect to the receipt thereof (but taking into account all correlative Tax deductions resulting from the payment of such Taxes) shall equal the amount of the payment which the party receiving such payment would otherwise be entitled to receive
pursuant to this Agreement. 

  
 11 

 ARTICLE V 

Miscellaneous 

Section 5.01 Term. All rights and obligations arising hereunder shall survive until they are fully effectuated or performed
provided that, notwithstanding anything in this Agreement to the contrary, this Agreement shall remain in effect and its provisions shall survive for the full period of all applicable statutes of limitation (giving effect to any extension, waiver or
mitigation thereof). 
 Section 5.02 Allocations. 

(a) In General. All computations with respect to any Pre-Deconsolidation Period shall be made pursuant to the principles of Treasury
Regulations Section 1.1502-76(b), taking into account such elections thereunder as Dell, in its reasonable, good faith discretion, shall make. 

(b) Tax Assets/Earnings and Profits. If it becomes necessary, in connection with any Deconsolidation, to allocate any Tax Assets and
earnings and profits among Dell, each Dell Affiliate, Spyglass, and each Spyglass Affiliate, the Parties shall mutually agree on the amount of Tax Assets and earnings and profits allocated to Spyglass and any dispute with respect thereto shall be
resolved by the Independent Accountant in accordance with the principles set forth in Section 2.02(b). 
 Section 5.03
Governing Law. This Agreement will be governed by and construed in accordance with the laws of the State of Texas, without giving effect to any choice or conflict of law provision or rule (whether of the State of Texas or any other
jurisdiction) that would cause the application of the applicable laws of any jurisdiction other than the State of Texas. 

Section 5.04 Notice. Whenever, by the terms of this Agreement, notice, demand or other communication shall or may be given to
either Party, the same shall be in writing and shall be addressed to the other Party at the addresses set forth below, or to such other address or addresses as shall from time to time be designated by written notice by any Party to another in
accordance with this Section 10.05. All notices shall be delivered as follows (with notice deemed given as indicated): (a) by personal delivery when delivered personally; (b) by Federal Express or other established overnight courier
upon written verification of receipt; (c) by facsimile transmission when receipt is confirmed; (d) by certified or registered mail, return receipt requested, upon verification of receipt; or (e) by electronic delivery (for routine
communications) when receipt is confirmed. 
 If to Dell: 

Dell Inc. 
 One Dell Way 

Round Rock, Texas 78682 
 Attn:
Senior Vice President and General Counsel 
 Email: Dell_Corporate_Legal_Notices@Dell.com 

  
 12 

 If to Spyglass: 

SecureWorks Holding Corporation 

One Concourse Parkway, Suite 500 

Atlanta, Georgia 30328 
 Attn:
Legal 
 Section 5.05 Binding Effect; Assignment. This Agreement shall inure to the benefit of and be binding upon the Parties
and their respective successors and assigns. Neither Party may assign this Agreement or any rights or obligations hereunder, except for any assignment by such Party to a Subsidiary of such Party (which shall not relieve such Party of liability in
the event of a default by such Subsidiary), without the prior written consent of the other Party, and any such assignment without such consent shall be void. 

Section 5.06 No Third-Party Beneficiaries or Right to Rely. Except as set forth in this Agreement, (a) nothing in this
Agreement is intended to or shall create for or grant to any Third Party any rights or remedies whatsoever, as a third-party beneficiary or otherwise, (b) no Third Party is entitled to rely on any of the representations, warranties, covenants
or agreements contained herein, and (c) no Party shall incur any liability or obligation to any Third Party because of any reliance by such Third Party on any representation, warranty, covenant or agreement herein. 

Section 5.07 Severability. If any term or other provision of this Agreement is determined by a court, administrative agency or
arbitrator to be invalid, illegal or incapable of being enforced by any rule of law or public policy, all other conditions and provisions of this Agreement shall nevertheless remain in full force and effect. Upon such determination that any term or
other provision is invalid, illegal or incapable of being enforced, the Parties shall negotiate in good faith to modify this Agreement so as to effect the original intent of the Parties as closely as possible in an acceptable manner to the end that
the transactions contemplated hereby are fulfilled to the fullest extent possible. 
 Section 5.08 Failure or Indulgence Not Waiver;
Remedies Cumulative. Any provision of this Agreement or any breach thereof may only be waived if done specifically and in writing by the Party which is entitled to the benefits thereof. No failure or delay on the part of any Party in the
exercise of any right hereunder shall impair such right or be construed to be a waiver of, or acquiescence in, any breach of any representation, warranty or agreement herein, nor shall any single or partial exercise of any such right preclude other
or further exercise thereof or of any other right. All rights and remedies existing under this Agreement are cumulative to, and not exclusive of, any rights or remedies otherwise available. 

Section 5.09 Entire Agreement; Amendment. This Agreement constitutes the sole and entire understanding of the Parties with respect
to the matters contemplated hereby and supersedes and renders null and void all prior negotiations, representations, agreements and understandings (oral and written) between the Parties with respect to such matters. No change or amendment may be
made to this Agreement except by an instrument in writing signed on behalf of each of the Parties. 
 Section 5.10 Authority; No
Conflict, etc. 
 (a) Each of the Parties represents and warrants to the other that it (i) has the corporate power and authority
and the legal right to enter into this Agreement and perform its obligations hereunder, and (ii) has taken all necessary corporate action on its part required to authorize the execution and delivery of

  
 13 

 
this Agreement and the performance of its obligations hereunder. This Agreement has been duly executed and delivered on behalf of such Party, and constitutes a legal, valid, binding obligation of
such Party and is enforceable against it in accordance with its terms subject to the effects of bankruptcy, insolvency or other laws of general application affecting the enforcement of creditor rights and judicial principles affecting the
availability of specific performance and general principles of equity whether enforceability is considered a proceeding at law or equity. 

(b) The execution, delivery and performance of this Agreement by each Party, and the consummation of the transactions contemplated hereby, do
not and will not conflict with, contravene, result in a violation or breach of or default under (with or without the giving of notice or the lapse of time or both), create in any other Person a right or claim of termination or right to amend or
modify, or result in the acceleration or cancellation of, or result in the creation of any lien (or any obligation to create any lien) upon any of the properties or assets of the Parties, under (i) any applicable law applicable to any Party or
any of their respective properties or assets, (ii) any provision of any of the organizational documents of any Party, or (iii) any material contract, agreement or instrument to which any Party is a party, or by which any of their
respective properties or assets, may be bound. 
 Section 5.11 Dispute Resolution. Any conflict or disagreement arising out of
the interpretation, implementation, or compliance with the provisions of this Agreement shall be finally settled pursuant to the dispute resolutions provisions of the Shared Services Agreement, which provisions are incorporated herein by reference.

 Section 5.12 Coordination with Shared Services Agreement and Employee Matters Agreement. Except as explicitly set forth in
the Shared Services Agreement or Employee Matters Agreement, this Agreement shall be the exclusive agreement among the Parties with respect to all Tax matters, including indemnification in respect of Tax matters, and shall take precedence over any
and all agreements among the Parties with respect to Tax matters. 
 Section 5.13 Counterparts. This Agreement may be executed
in counterparts, each of which shall be deemed to be an original but all of which shall constitute one and the same agreement. 

Section 5.14 Certain Rules of Construction. 

(a) The terms “hereof,” “herein” and “herewith,” and words of similar import shall, unless otherwise stated, be
construed to refer to this Agreement as a whole and not to any particular provision of this Agreement; and the terms “Recital,” “Article,” and “Section” are references to the Recitals, Articles, and Sections of or to
this Agreement, unless otherwise specified. 
 (b) The word “including” and words of similar import when used in this Agreement
shall mean “including without limitation” unless the context otherwise requires or unless otherwise specified. 
 (c) The word
“or” shall not be exclusive. 
 (d) Words expressed in the singular number shall include the plural and vice versa; words
expressed in the masculine shall include the feminine and neuter gender and vice versa. 
 (e) References to “day” or
“days” are to calendar days. References to “the date hereof” shall mean as of the Effective Date. 
 (f) The headings
contained in this Agreement are for reference purposes only and are not part of this Agreement. 

  
 14 

 (g) No rule of construction against the draftsperson shall be applied in connection with the
interpretation or enforcement of this Agreement. 
 (h) A reference to a statute, listing rule, regulation, order or other applicable law
includes a reference to the corresponding regulations and instruments and includes a reference to each of them as amended, consolidated, recreated, replaced or rewritten. 

(i) If a word or phrase is defined, its other grammatical forms have a corresponding meaning. 

(j) A reference to a Party to this Agreement or another agreement or document includes the Party’s successors, permitted substitutes and
permitted assigns. 

  
 15 

 IN WITNESS WHEREOF, the undersigned has executed this Tax Matters Agreement, as of the date first
written above. 
  

	
	DENALI HOLDING INC.
	
	 /s/ Janet B. Wright

	Janet B. Wright
	Vice President & Asst. Secretary
	
	SECUREWORKS HOLDING CORPORATION
	
	 /s/ Michael R. Cote

	Michael R. Cote
	President & Chief Executive OfficerEX-10.5.1

 Exhibit 10.5.1 

Amendment #1 to 
 TAX
MATTERS AGREEMENT 
 THIS AMENDMENT #1 TO TAX MATTERS AGREEMENT (this “Amendment”), dated December 8, 2015, and
effective as of the Effective Date, is made by and among SecureWorks Corp. (f/k/a SecureWorks Holding Corporation), for itself and its Subsidiaries (“Spyglass”), and Denali Holding Inc., for itself and its Subsidiaries other than
Spyglass (“Dell”) (each a “Party” and collectively, the “Parties”) and amends the Tax Matters Agreement, dated July 20, 2015, that was entered into by and between the Parties
(“Agreement”). Capitalized terms used herein, but not defined herein, shall have the meanings given to such terms in the Agreement. 

RECITALS 
 WHEREAS, the
Parties previously entered into the Agreement in order to set forth their agreement regarding the allocation of Taxes, the filing of Tax Returns, the administration of Audits (as defined in the Agreement) and other related matters; and 

WHEREAS, the Parties now wish to amend the Agreement as set forth herein. 

NOW, THEREFORE, in consideration of the mutual agreements, provisions, and covenants contained in this Amendment, the Parties, intending to be
legally bound, hereby agree as follows: 
 1. Recitals. The fourth recital of the Agreement shall be deleted in its entirety and
replaced with the following: 
 “WHEREAS, Dell and Spyglass desire to set forth their agreement regarding the allocation of Taxes (as
defined below), the filing of Tax Returns (as defined below), the administration of Audits (as defined below) and other related matters after the Effective Date of this Agreement.” 

2. Section 3.05(c). Section 3.05(c) of the Agreement shall be deleted in its entirety and replaced with the following: 

“(c) Year of the Effective Date. For purposes of this Agreement, the taxable year that includes the Effective Date shall be treated
as if it were comprised of two taxable periods, one of which ends on the Effective Date and one of which begins on the day after the Effective Date. For purposes of computing the Federal Taxes attributable to each period of the taxable year, the
amount of any item that is taken into account only once for each taxable year (e.g., the benefit of graduated tax rates, exemption amounts) shall be allocated between the two portions of the year in proportion to the number of days in each portion.
To the extent needed under this Agreement, the Spyglass Group Federal Income Tax Liability shall be determined separately for each period.” 

3. Section 3.09(e). 3.09(e) of the Agreement shall be deleted in its entirety and replaced with the following: 

“(e) Year of the Effective Date. Consistent with Section 3.05(c), if there is a redetermination that affects a Consolidated
Return or Combined Return for the taxable year that includes the Effective Date, the Redetermination Amount shall be determined separately for the taxable period ending on the Effective Date and the taxable period beginning on the day after the
Effective Date.” 
 4. Miscellaneous. Except as amended by the terms of this Amendment, the terms and conditions of the Agreement
shall remain in full force and effect. In the event of a conflict between the terms of the Agreement and the terms of this Amendment, the terms of this Amendment shall govern and control. This Amendment and the Agreement constitute the sole and
entire understanding of the Parties with respect to the matters contemplated hereby and supersede and render null and void all prior negotiations, representations, agreements, and understandings (oral and written) between the Parties with respect to
such matters. This Amendment shall inure to the benefit of and be binding upon the Parties and their respective successors and assigns. This Amendment may be executed in counterparts, each of which shall be deemed to be an original but all of which
shall constitute one and the same agreement. 

 IN WITNESS WHEREOF, the Parties have executed this Amendment as of the date first set forth
above. 
  

			
	DENALI HOLDING INC.
		
	By:	 	/s/ Janet B. Wright
	Name:	 	Janet B. Wright
	Title:	 	Vice President & Assistant Secretary
	
	SECUREWORKS CORP.
		
	By:	 	/s/ Michael R. Cote
	Name:	 	Michael R. Cote
	Title:	 	President and Chief Executive
		 	Officer

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