Document:

EX-4.7

 Exhibit 4.7 

FORM OF 
 AMENDMENT
AGREEMENT 
 THIS AMENDMENT AGREEMENT (this “Agreement”) is entered into and effective as of
[    ], 2021, by and among Legato Merger Corp., a Delaware corporation (“Legato”), Algoma Steel Group Inc. (formerly known as 1295908 B.C. Ltd.), a company organized under the laws of the Province of British
Columbia (“Algoma”), Continental Stock Transfer & Trust Company, a New York limited purpose trust company (“Continental”), as warrant agent, and TSX Trust Company, a company existing under the laws of
Canada (“TSX”), as Canadian co-warrant agent (“Co-Agent”). Capitalized terms used but not defined herein have the meanings given to
such terms in the Warrant Agreement (as defined below). 
 WHEREAS, Legato and Continental have previously entered into a warrant agreement,
dated as of January 19, 2021 (the “Warrant Agreement”), governing the terms of Legato’s outstanding warrants to purchase shares of common stock of Legato (the “Warrants”); 

WHEREAS, Legato has entered into an Agreement and Plan of Merger, dated as of May 24, 2021 (the “Merger Agreement”), by
and among Legato, Algoma, Algoma Merger Sub, Inc., a Delaware corporation and a direct, wholly-owned subsidiary of Algoma (“Merger Sub”), pursuant to which Merger Sub, will merge through a statutory merger with and
into Legato, with Legato surviving the merger as a direct, wholly-owned subsidiary of Algoma (the transactions contemplated by the Merger Agreement are referred to herein as the “Merger”); 

WHEREAS, at the closing of the Merger (the “Closing”), each outstanding share of Legato’s common stock, par value
$0.0001 per share, will be converted into and exchanged for the right to receive one common share of Algoma (the “Common Shares”); 

WHEREAS, pursuant to Section 2.8(c) of the Merger Agreement and Section 4.5 of the Warrant Agreement, upon the Closing, each
Warrant issued and outstanding immediately prior thereto will be converted into a warrant to purchase Common Shares (collectively, the “Algoma Warrants”), and the rights and obligations of Legato under the Warrant Agreement shall
become rights and obligations of Algoma; 
 WHEREAS, as a result of the foregoing, the parties hereto wish for Legato to cease to have any
rights, interests or obligations in or under the Warrant Agreement and for Algoma to accept and become entitled to and possess all such rights and interests and become subject to all such obligations thereunder, in each case, effective upon the
Closing; and 
 WHEREAS, in connection with the foregoing, the Company desires that TSX be appointed as
Co-Agent for the Warrants under the Warrant Agreement, and TSX is willing to so act as Co-Agent, in connection with the issuance, registration, transfer, exchange,
redemption, and exercise of the Warrants; 
 NOW, THEREFORE, for good and valuable consideration, receipt of which is hereby acknowledged,
the parties hereby agree as follows: 
 1. Amendment of Warrant Agreement. Effective as of the Closing, Legato shall hereby cease to
have any rights, interest or obligation in or under the Warrant Agreement and Algoma hereby agrees to accept and to become entitled to and possess, all of Legato’s rights and interests, and to become subject to all of Legato’s obligations,
in and under the Warrant Agreement, and Algoma hereby confirms that it agrees to all rights, interests and obligations under the Algoma Warrants. Unless the context otherwise requires, from and after the Closing, any references in the Warrant
Agreement or the Warrants to: (i) the “Company” shall mean Algoma; (ii) “Common Stock” or “shares” shall mean the Common Shares; and (iii) the “Board of Directors” or any committee thereof shall
mean the board of directors of Algoma or any committee thereof. 

 2. Replacement Instruments. As of the Closing, all outstanding instruments evidencing
Warrants shall automatically be deemed to evidence Algoma Warrants reflecting the conversion and adjustment to the terms and conditions described herein and in Section 4.5 of the Warrant Agreement. Following the Closing, upon request by
any holder of a Algoma Warrant, Algoma shall issue a new instrument for such Algoma Warrant to the holder thereof. 
 3. Appointment of Co-Agent. The Company hereby appoints TSX to act as Co-Agent for the Company for the Warrants in Canada, and TSX hereby accepts such appointment and agrees to perform the
same in accordance with the terms and conditions set forth in this Agreement and the Warrant Agreement. 
 4. Amendments to Warrant
Agreement. To the extent required by this Agreement, the Warrant Agreement is hereby deemed amended pursuant to Section 9.8 thereof to reflect the subject matter contained in this Agreement, effective as of the Closing, including as set
forth below: 
  

	 	(a)	 Except as context or applicable law or regulations, including those of any securities exchange on which the
Warrants are listed, require otherwise, all references to “Warrant Agent” shall be deemed to refer to the Warrant Agent and the Co-Agent, as applicable. 

 

	 	(b)	 Section 2.2 of the Warrant Agreement is hereby amended by deleting such Section and
replacing it entirely as follows: 

 2.2. Uncertificated Warrants. Notwithstanding anything
herein to the contrary, any Warrant, or portion thereof, may be issued as part of, and be represented by, a Unit, and any Warrant may be issued in uncertificated or book-entry form through (i) the Warrant Agent and/or the facilities of The
Depository Trust Company (“DTC”), in the United States or (ii) the Co-Agent and/or the facilities of CDS Clearing and Depository Services Inc. in Canada (“CDS” and, each
DTC and CDS, a “Depositary”), or other book-entry depositary system, in each case as determined by the Board of Directors of the Company or by an authorized committee thereof. Any Warrant so issued shall be evidenced by a book
position on the register of holders to be maintained by the Warrant Agent pursuant to this Agreement and such Warrants shall have the same terms, force and effect as a certificated Warrant that has been duly countersigned by the Warrant Agent in
accordance with the terms of this Agreement. 
 Upon the written order of the Company, the Warrant Agent shall authenticate
uncertified warrants (whether upon original issuance, exchange, registration of transfer or otherwise) by completing its internal procedures and the Company shall, and hereby acknowledges that it shall, thereupon be deemed to have duly and validly
issued such uncertified warrants under this Agreement. Such authentication shall be conclusive evidence that such uncertificated warrant has been duly issued hereunder and that the holder or holders are entitled to the benefits of this Agreement.
The Warrant Register shall be final and conclusive evidence as to all matters relating to uncertificated warrants with respect to which this Agreement requires the Warrant Agent to maintain records or accounts. In case of differences between the
register at any time and any other time, the register at the later time shall be controlling, absent manifest error and such uncertificated warrants are binding on the Company. 

 

	 	(c)	 Section 2.3 of the Warrant Agreement is hereby amended by deleting such Section and
replacing it entirely as follows: 

 2.3. Effect of Countersignature. Certificated Warrants will be countersigned by
the Warrant Agent upon the receipt of a written order of the Company. Except with respect to uncertificated Warrants as described above, unless and until countersigned by the Warrant Agent pursuant to this Agreement, the Warrant shall be invalid and
of no effect and may not be exercised by the holder thereof. 
 No certified warrant shall be considered issued and shall be obligatory or
shall entitle the holder thereof to the benefits of this Agreement, until it has been certified by manual signature by or on behalf of the Warrant Agent. The authentication of the Warrant Agent of the warrant certificates and uncertificated warrants
issued hereunder shall not be construed as a representation or warranty by such Warrant Agent as to the validity of this Agreement or the Warrants (except the due authentication thereof) and such Warrant

  
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Agent shall in no respect be liable or answerable for the use made of the Warrants or any of them or of the consideration thereof except as otherwise specified herein. 

 

	 	(d)	 Section 2.4.1 of the Warrant Agreement is hereby amended by deleting such Section and
replacing it entirely as follows: 

 2.4.1. Warrant Register. Each of the Warrant Agent and the Co-Agent shall maintain books (“Warrant Register”) for the registration of original issuance and the registration of transfer of the Warrants relating to the Warrants held in their respective
jurisdictions. Upon the issuance of the Warrants, the Warrant Agent or the Co-Agent, as applicable, shall issue and register the Warrants in the names of the respective holders thereof in such denominations
and otherwise in accordance with instructions delivered to the Warrant Agent or the Co-Agent by the Company. Any registered holders of Warrants who hold such securities on the Warrant Register maintained by
the Warrant Agent shall surrender their Warrants for exchange, transfer or exercise to the Warrant Agent. Any registered holders of Warrants who hold such securities on the Warrant Register maintained by the
Co-Agent shall surrender their Warrants for exchange, transfer or exercise to the Co-Agent. 
  

	 	(e)	 Section 2.5 of the Warrant Agreement is hereby amended by adding the words “and
Toronto” after the words “New York City” in the first sentence thereof. 

  

	 	(f)	 The Warrant Agreement is hereby amended by adding the following Sections. 

2.8. Book Entry (Non Certificated) Warrants. Notwithstanding any other provision in this Agreement, no Warrants
issued in the name of a Depository (“Global Warrants”) may be exchanged in whole or in part for Warrants registered, and no transfer of any Global Warrants in whole or in part may be registered, in the name of any person other than
the Depository for such Global Warrants or a nominee thereof unless: 
  

	 	a)	 the Depository notifies the Company that it is unwilling or unable to continue to act as depository in
connection with the Warrants and the Company is unable to locate a qualified successor; 

  

	 	b)	 the Company determines that the Depository is no longer willing, able or qualified to discharge properly its
responsibilities as holder of the Global Warrants and the Company is unable to locate a qualified successor; 

  

	 	c)	 the Depository ceases to be a clearing agency or otherwise ceases to be eligible to be a depository and the
Company is unable to locate a qualified successor; 

  

	 	d)	 the Company determines that the Warrants shall no longer be held as uncertified warrants through the
Depository; 

  

	 	e)	 such right is required by applicable law, as determined by the Company and the Company’s counsel; or

  

	 	f)	 such right is requested by a beneficial owner and approved by the Company in its sole discretion.

 Following which, Warrants for those holders requesting the same shall be registered to the beneficial
owners of such Warrants or their nominees as directed by the Depository. The Company shall provide an officer’s certificate giving notice to the Warrant Agent of the occurrence of any event outlined in this Section 2.8. 

  
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 Subject to the provisions of this Section 2.8 any exchange of Global
Warrants for Warrants which are not Global Warrants may be made in whole or in part in accordance with the provisions of this Agreement. All such Warrants issued in exchange for a Global Warrant or any portion thereof shall be registered in such
names as the Depository for such Global Warrants shall direct and shall be entitled to the same benefits and subject to the same terms and conditions (except insofar as they relate specifically to Global Warrants) as the Global Warrants or portion
thereof surrendered upon such exchange.
 The rights of beneficial owners of Warrants who hold securities entitlements in
respect of the Warrants through the book entry registration system shall be limited to those established by applicable law and agreements between the Depository and institutions that participate in the applicable Depository’s book-entry
registration system (“Book Entry Participants”) and between such Book Entry Participants and the beneficial owners of Warrants who hold securities entitlements in respect of the Warrants through the book entry registration system,
and such rights must be exercised through a Book Entry Participant in accordance with the rules and procedures of the Depository. 

Notwithstanding anything herein to the contrary, neither the Company nor the Warrant Agent nor the Co-Agent nor any agent thereof shall have any responsibility or liability for: 
  

	 	a)	 the electronic records maintained by the Depository relating to any ownership interests or any other
interests in the Warrants or the depository system maintained by the Depository, or payments made on account of any ownership interest or any other interest of any person in any Warrant represented by an electronic position in the book entry
registration system (other than the Depository or its nominee); 

  

	 	b)	 maintaining, supervising or reviewing any records of the Depository or any Book Entry Participant relating
to any such interest; or 

  

	 	c)	 any advice or representation made or given by the Depository or those contained herein that relate to the
rules and regulations of the Depository or any action to be taken by the Depository on its own direction or at the direction of any Book Entry Participant. 

The Company may terminate the application of the Section 2.8 in its sole direction in which case all Warrants shall be
evidenced by warrant certificates registered in the name of a person other than the Depository. 
 Section 2.9
Authorization of Warrants and underlying Common Shares. Subject to the terms and conditions of this Agreement, and subject to any adjustment hereunder, a total of 24,329,000 Warrants (comprising the maximum amount of Public Warrants, Private
Warrants and Working Capital Warrants to be issued) plus any Post IPO Warrants issued after the date hereof, entitling the holders thereof to acquire up to 24,329,000 Common Shares, plus any shares underlying the exercise of any Post IPO Warrants,
are hereby authorized to be issued hereunder upon the terms and conditions herein set forth. 
  

	 	(g)	 Section 3.2 of the Warrant Agreement is hereby amended by deleting the first sentence of such Section and
replacing it entirely as follows: 

 3.2. Duration of Warrants. A Warrant may be exercised only
during the period commencing on the date that is thirty (30) days after the consummation by the Company of a merger, share exchange, asset acquisition, stock purchase, recapitalization, reorganization or other similar business combination
with one or more businesses or entities (“Business Combination”) (as described more fully in the Registration Statement), and terminating at 5:00 p.m., New York City time on the earlier to occur of (i) the date that is five
(5) years after the date on which the Company consummates a Business Combination, (ii) other than with respect to the Private Warrants and Working Capital Warrants then held by the initial purchasers or their respective Permitted
Transferees with respect to a redemption pursuant to Section 6.1 (an “Inapplicable Redemption”), at 5:00 p.m., New York City time on the Redemption Date as provided in Section 6.2 of this Agreement and (iii) the liquidation
of the Trust Account (defined below) (“Expiration Date”). 
  

	 	(h)	 Section 3.3.1 of the Warrant Agreement is hereby amended by deleting the first
paragraph of such Section and replacing it entirely as follows: 

 3.3.1. Payment. Subject to
the provisions of the Warrant and this Agreement, a Warrant, when countersigned or authenticated by the Warrant Agent, may be exercised by the registered holder thereof by surrendering it, at the offices of the Warrant Agent or the Co-Agent, as applicable, or at the office of any successor as Warrant Agent, in the Borough of Manhattan, City and State of New York or the City of Toronto in the Province of Ontario, with the subscription form, as
set forth in the Warrant, duly executed, and by paying in full the Warrant Price (in U.S. dollars) for each Common Share as to which the Warrant is exercised and any and all applicable taxes due in connection with the exercise of the Warrant, as
follows: 

  
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	 	(i)	 Section 3.3.1(c) of the Warrant Agreement is hereby amended by adding the words
“on a cashless basis” following the words “or their permitted transferees,” in the first sentence thereof: 

  

	 	(j)	 Section 3.3.1 of the Warrant Agreement is hereby amended by adding the following
two paragraphs after paragraph (d) thereof as follows: 

 A beneficial owner of uncertificated
warrants evidenced by a security entitlement in respect of Warrants in the book-based registration system who desires to exercise Warrants must do so by causing a Book Entry Participant to deliver to the Depository on behalf of the entitlement
holder, notice of the owner’s intention to exercise Warrants in a manner acceptable to the Depository. Forthwith upon receipt by the Depository of such notice, as well as payment for the aggregate Warrant Price, the Depository shall deliver to
the Warrant Agent confirmation of its intention to exercise Warrants (“Confirmation”) in a manner acceptable to the Warrant Agent, including by electronic means through the book-based registration system. 

Payment representing the aggregate Warrant Price must be provided to the appropriate office of the Book-Entry Participant in a
manner acceptable to it. A notice in form acceptable to the Book-Entry Participant and payment from such beneficial owner should be provided to the Book-Entry Participant sufficiently in advance so as to permit the Book-Entry Participant to deliver
notice and payment to the Depository and for the Depository in turn to deliver notice and payment to the Warrant Agent prior to the Expiration Date. The Depository will initiate the exercise by way of the Confirmation and forward the Warrant Price
electronically to the Warrant Agent and the Warrant Agent will execute the exercise by causing the issuance to the Depository through the book-based registration system the Common Stock to which the exercising holder is entitled pursuant to the
exercise. Any expense associated with the exercise process will be for the account of the entitlement holder exercising the Warrants and/or the Book-Entry Participant exercising the Warrants on its behalf. 

 

	 	(k)	 Section 3.3.5 of the Warrant Agreement is hereby amended by adding the following
two paragraphs at the end thereof as follows: 

 As a result of these limitations, in all instances whereby
the holder of a Warrant has elected to be subject to the provisions contained in this subsection 3.3.5, such warrant exercises will be forwarded to the Company for their approval. Such approval will be provided to the Warrant Agent or the Co-Agent in the form of a certificate of the Company confirming that such holder will not beneficially own in excess of the Maximum Percentage of the issued and outstanding Common Shares as a result of such exercise
and therefore instructing the Warrant Agent or the Co-Agent to proceed with the exercise requested and the Warrant Agent or the Co-Agent shall be fully protected in
relying on such certificate. 
 Neither the Warrant Agent nor the Co-Agent will not
process any exercise of Warrants from holders of a Warrant who have elected to be subject to the provisions contained in this subsection 3.3.5 unless it has received the above certificate from the Company. For greater certainty, neither the Warrant
Agent nor the Co-Agent will have responsibility for monitoring the beneficial ownership level of the Common Shares held by holders and neither will have any liability in regards to the determinations made of
whether or not a holder would become a beneficial holder in excess of the Maximum Percentage of the issued and outstanding Common Shares, such determinations will be the sole responsibility of the Company. 

 

	 	(l)	 The Warrant Agreement is hereby amended by adding the following Section: 

4.11 Protection of Warrant Agent and Co-Agent. Each of the Warrant Agent
and Co-Agent shall not: 
 (a) at any time be under any duty or responsibility to any
holder to determine whether any facts exist which may require any adjustment contemplated by Section 4 or with respect to the nature or extent of any such adjustment when made, or with respect to the method employed in making the same; 

  
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 (b) be accountable with respect to the validity or value (or the kind of
amount) of any Common Shares or any shares or other securities or property which may at any time be issued or delivered upon the exercise of the rights attaching to any Warrant; or 

(c) be responsible for any failure of the Company to issue, transfer or deliver shares or certificates for the same upon the
surrender of any Warrants for the purpose of the exercise of such rights or to comply with any of the covenants contained in this Article 4. 

The Warrant Agent and Co-Agent shall be entitled to act and rely upon the certificates
or adjustment calculations for the Company or the Company’s auditors and any other documents filed by the Company pursuant to Section 4 without verification or liability. 

 

	 	(m)	 Section 5.1 of the Warrant Agreement is hereby amended by deleting such Section
and replacing it entirely as follows: 

 5.1. Registration of Transfer. The Warrant Agent or Co-Agent, as applicable, shall register the transfer, from time to time, of any outstanding Warrant upon the Warrant Register, upon surrender of such Warrant for transfer, properly endorsed with signatures, in the
case of certificated Warrants, properly guaranteed and accompanied by appropriate instructions for transfer. Upon any such transfer, a new Warrant representing an equal aggregate number of Warrants shall be issued and the old Warrant shall be
cancelled by the Warrant Agent or the Co-Agent. In the case of certificated Warrants, the Warrants so cancelled by the Warrant Agent shall be delivered by the Warrant Agent to the Company from time to time
upon request. All transfers of Warrants held in book entry form with the applicable Depository will not be reflected on the Warrant Register. 
  

	 	(n)	 The Warrant Agreement is hereby amended by adding the following Section: 

6.5 Responsibility for Calculations. All calculations required to be made under Section 3.3.1(b),
Section 3.3.1(c), Section 3.3.1(d), Section 3.3.5 and Section 6 will be the responsibility of the Company and confirmed by written notice to the Warrant Agent (or Co-Agent, if applicable)
of which can be relied upon for all purposes. 
  

	 	(o)	 Section 7.2 of the Warrant Agreement is hereby amended by deleting such Section and
replacing it entirely as follows: 

 7.2. Lost, Stolen, Mutilated, or Destroyed Warrants. If any Warrant is
lost, stolen, mutilated, or destroyed, the Company and the Warrant Agent may on such terms as to indemnity or otherwise as they may in their discretion impose (which shall, in the case of a mutilated Warrant, include the surrender thereof), issue a
new Warrant of like denomination, tenor, and date as the Warrant so lost, stolen, mutilated, or destroyed. Any such new Warrant shall constitute a substitute contractual obligation of the Company, whether or not the allegedly lost, stolen,
mutilated, or destroyed Warrant shall be at any time enforceable by anyone. The applicant for the issuance of a new warrant certificate pursuant to this Section 7.2 shall bear the reasonable cost of the issue thereof and in case of loss,
destruction or theft shall, as a condition precedent to the issue thereof, furnish to the Company and to the Warrant Agent evidence of ownership and of the loss, destruction or theft of the warrant certificate so lost, destroyed or stolen
satisfactory to the Warrant Agent and the Company in its sole discretion, acting reasonably, and such applicant may also be required to furnish an indemnity and surety bond in amount and form satisfactory to the Warrant Agent in its sole discretion,
acting reasonably, and shall pay the reasonable charges of the Company and the Warrant Agent in connection therewith. 
  

	 	(p)	 Section 8.2.1 of the Warrant Agreement is hereby amended by deleting such Section
and replacing it entirely as follows: 

 8.2.1. Appointment of Successor Warrant Agent. The
Warrant Agent, Co-Agent, or any respective successor hereafter appointed, may resign its duties and be discharged from all further duties and liabilities hereunder after giving sixty (60) days’
notice in writing to the Company. If the office of the Warrant Agent 

  
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or Co-Agent becomes vacant by resignation or incapacity to act or otherwise, the Company shall appoint in writing a successor Warrant Agent or Co-Agent in place of the resigning or incapacitated Warrant Agent or Co-Agent. If the Company shall fail to make such appointment within a period of thirty (30) days
after it has been notified in writing of such resignation or incapacity by such Warrant Agent or Co-Agent or by the holder of the Warrant (who shall, with such notice, submit his Warrant for inspection by the
Company), then the holder of any Warrant may apply to the Supreme Court of the State of New York for the County of New York for the appointment of a successor Warrant Agent or Co-Agent at the Company’s
cost. Any successor Warrant Agent, whether appointed by the Company or by such court, shall be a corporation organized and existing under the laws of the State of New York, in good standing and having its principal office in the Borough of
Manhattan, City and State of New York (in the case of the Warrant Agent, or a corporation organized and existing under the laws of Canada or a Province thereof and having its principal office in the City of Toronto in the Province of Ontario, in the
case of the Co-Agent), and in each case authorized under applicable laws to exercise corporate trust powers and subject to supervision or examination by federal or state authority. After appointment, any
successor Warrant Agent or Co-Agent, as applicable, shall be vested with all the authority, powers, rights, immunities, duties, and obligations of its predecessor Warrant Agent or Co-Agent, as applicable, with like effect as if originally named as Warrant Agent or Co-Agent hereunder, without any further act or deed; but if for any reason it becomes
necessary or appropriate, the predecessor Warrant Agent or Co-Agent shall, upon payment of any outstanding fees and expenses, execute and deliver, at the expense of the Company, an instrument transferring to
such successor Warrant Agent or Co-Agent, as applicable, all the authority, powers, and rights of such predecessor Warrant Agent hereunder; and upon request of any successor Warrant Agent or Co-Agent the Company shall make, execute, acknowledge, and deliver any and all instruments in writing for more fully and effectually vesting in and confirming to such successor Warrant Agent or Co-Agent all such authority, powers, rights, immunities, duties, and obligations. 
  

	 	(q)	 Section 8.4.3. of the Warrant Agreement is hereby amended by adding the following
sentences at the end thereof: 

 No duty shall rest with the Warrant Agent to determine compliance of the transferor or transferee with
applicable securities laws. The Warrant Agent shall be entitled to assume that all transfers are legal and proper. The Warrant Agent shall not incur any liability or responsibility whatever or be in any way responsible for the consequence of any
breach on the part of the Company of any of the covenants herein contained or of any acts of any directors, officers, employees, agents or servants of the Company. 
  

	 	(r)	 The Warrant Agreement is hereby amended by adding the following Section: 

8.6 Action by the Warrant Agent. The obligation of the Warrant Agent to commence or continue any act, action or proceeding for the purpose of
enforcing any rights of the Warrant Agent or the holders hereunder shall be conditional upon holders furnishing, when required by notice by the Warrant Agent, sufficient funds to commence or continue such act, action or proceeding and indemnity
reasonably satisfactory to the Warrant Agent to protect and hold harmless the Warrant Agent against the costs, charges and expenses and liabilities to be incurred thereby and any loss and damage it may suffer by reason thereof. None of the
provisions contained in this Agreement shall require the Warrant Agent to expend or risk its own funds or otherwise incur financial liability in the performance of any of its duties or in the exercise of any of its rights or powers unless
indemnified as aforesaid. 
  

	 	(s)	 Section 9.2 of the Warrant Agreement is hereby amended by deleting such Section and
replacing it entirely as follows: 

 9.2. Notices. Any notice, statement or demand authorized
by this Agreement to be given or made by the Warrant Agent or by the holder of any Warrant to or on the Company shall be sufficiently given when so delivered if by hand or overnight delivery, by pdf via email, or if sent by certified mail or private
courier service within five (5) days after deposit of such notice, postage prepaid, addressed (until another address is filed in writing by the Company with the Warrant Agent), as follows: 

  
 7 

 Algoma Steel Group Inc. 

105 West Street 
 Sault Ste.
Marie, Ontario P6A 7B4 
 Attention: John Naccarato 

Any notice, statement or demand authorized by this Agreement to be given or made by the holder of any Warrant or by the Company to or on the
Warrant Agent shall be sufficiently given when so delivered if by hand or overnight delivery or if sent by certified mail or private courier service within five days after deposit of such notice, postage prepaid, addressed (until another address is
filed in writing by the Warrant Agent with the Company), as follows: 
 Continental Stock Transfer & Trust Company 

1 State Street 
 New York, New
York 10004 
 Attn: Compliance Department 

TSX Trust Company 
 301—100
Adelaide Street 
 Toronto, Ontario M5H 4H1 

Attn: Vice President, Trust Services 

Email: tmxestaff-corporatetrust@tmx.com 
 with a
copy in each case to: 
 Paul, Weiss, Rifkind, Wharton & Garrison LLP 

1285 Avenue of the Americas 
 New
York, New York 10019 
 Attention: Adam M. Givertz 

Email: agivertz@paulweiss.com 
  

	 	(t)	 Section 9.5 of the Warrant Agreement is hereby amended by deleting such Section and
replacing it entirely as follows: 

 9.5. Examination of the Warrant Agreement. A copy of this
Agreement shall be available at all reasonable times at the office of the Warrant Agent in the Borough of Manhattan, City and State of New York and the office of the Co-Agent in the City of Toronto in the
Province of Ontario, for inspection by the registered holder of any Warrant. The Warrant Agent or Co-Agent, as applicable, may require any such holder to submit his Warrant for inspection by it. 

 

	 	(u)	 The Warrant Agreement is hereby amended by adding the following Sections: 

9.10 Currency. All dollar amounts herein are expressed in United States dollars. 

9.11 Day not a Business Day. If any day on or before which any action or notice is required to be taken or given hereunder is not
a Business Day, then such action or notice shall be required to be taken or given on or before the requisite time on the next succeeding day that is a Business Day. 

5. Applicable Law. The validity, interpretation, and performance of this Agreement shall be governed in all respects by the laws of the
State of New York, without giving effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction. 

6. Counterparts. This Agreement may be executed in any number of original or facsimile counterparts and each of such counterparts shall
for all purposes be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. Execution and delivery of this 

  
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Agreement by electronic mail or exchange of facsimile of .pdf copies bearing the facsimile signature of a party hereto shall constitute a valid and binding execution and delivery of this
Agreement by such party. 
 7. Successors. All the covenants and provisions of this Agreement shall bind and inure to the benefit of
each party’s respective successors and assigns. 
 [Signature Page Follows] 

  
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 IN WITNESS WHEREOF, this Agreement has been duly executed by the parties hereto as of the
day and year first above written. 
  

			
	LEGATO MERGER CORP.
		
	By:	 	 
		 	Name:
		 	Title:

  

			
	ALGOMA STEEL GROUP INC.
		
	By:	 	 
		 	Name:
		 	Title:

  

			
	CONTINENTAL STOCK TRANSFER & TRUST COMPANY

 
			
		
	By:	 	 
		 	Name:
		 	Title:

  

			
	TSX TRUST COMPANY
		
	By:	 	 
		 	Name:
		 	Title:
		
	By:	 	 
		 	 Name:

		 	 Title:

 [Signature Page to Amendment Agreement]EX-4.8

 Exhibit 4.8 

INVESTOR RIGHTS AGREEMENT 

dated as of [•], 
 2021 by and

 among 
 ALGOMA STEEL GROUP
INC. 
 and 
 CERTAIN
SHAREHOLDERS OF ALGOMA STEEL GROUP INC. 

 TABLE OF CONTENTS 

 

							
	 ARTICLE I DEFINITIONS
	  	 	1	 
	 Section 1.1
	  	Definitions	  	 	1	 
	 Section 1.2
	  	Other Definitional and Interpretative Provisions	  	 	9	 
	 ARTICLE II CORPORATE GOVERNANCE
	  	 	10	 
	 Section 2.1
	  	Nomination Rights	  	 	10	 
	 Section 2.2
	  	Vacancies	  	 	11	 
	 Section 2.3
	  	Compensation	  	 	11	 
	 Section 2.4
	  	Organizational Document Provisions	  	 	12	 
	 Section 2.5
	  	Notice of Meeting	  	 	12	 
	 Section 2.6
	  	Board Observers	  	 	12	 
	 Section 2.7
	  	Exculpation; Indemnification; D&O Insurance	  	 	12	 
	 Section 2.8
	  	Priority of Indemnification	  	 	14	 
	 ARTICLE III REGISTRATION RIGHTS
	  	 	15	 
	 Section 3.1
	  	Demand Registration	  	 	15	 
	 Section 3.2
	  	Piggyback Registration	  	 	17	 
	 Section 3.3
	  	Restriction on Demand Registration and Piggyback Registration	  	 	18	 
	 Section 3.4
	  	Transfer Restrictions	  	 	18	 
	 Section 3.5
	  	Registration Procedures	  	 	19	 
	 Section 3.6
	  	Indemnification by the Company	  	 	22	 
	 Section 3.7
	  	Indemnification by Participating Shareholders	  	 	23	 
	 Section 3.8
	  	Conduct of Indemnification Proceedings	  	 	24	 
	 Section 3.9
	  	Contribution	  	 	25	 
	 Section 3.10
	  	Participation in Public Offering	  	 	26	 
	 Section 3.11
	  	Other Indemnification; Third-Party Beneficiaries	  	 	26	 
	 Section 3.12
	  	Limitations on Subsequent Registration Rights	  	 	26	 
	 Section 3.13
	  	Alternative Registration Rights	  	 	27	 
	 Section 3.14
	  	Opt-Out Process	  	 	27	 
	 ARTICLE IV CERTAIN COVENANTS AND AGREEMENTS
	  	 	27	 
	 Section 4.1
	  	Business Opportunities	  	 	27	 
	 Section 4.2
	  	Tax Matters	  	 	27	 
	 ARTICLE V MISCELLANEOUS
	  	 	28	 
	 Section 5.1
	  	Binding Effect; Assignability; Third-Party Beneficiaries	  	 	28	 
	 Section 5.2
	  	Notices	  	 	29	 
	 Section 5.3
	  	Waiver; Amendment; Termination; Fallaway	  	 	29	 

							
	 Section 5.4
	  	Fees and Expenses	  	 	30	 
	 Section 5.5
	  	Governing Law	  	 	30	 
	 Section 5.6
	  	Jurisdiction	  	 	30	 
	 Section 5.7
	  	WAIVER OF JURY TRIAL	  	 	31	 
	 Section 5.8
	  	Specific Enforcement	  	 	31	 
	 Section 5.9
	  	Counterparts; Effectiveness	  	 	31	 
	 Section 5.10
	  	Entire Agreement	  	 	31	 
	 Section 5.11
	  	Termination of Existing Registration Rights	  	 	31	 
	 Section 5.12
	  	Severability	  	 	31	 
	 Section 5.13
	  	Aggregation of Affiliates and Related Funds	  	 	31	 
	 Section 5.14
	  	Independent Agreement by the Shareholders	  	 	32	 
	 Section 5.15
	  	Status as Shareholder	  	 	32	 

  

 INVESTOR RIGHTS AGREEMENT 

This Investor Rights Agreement (the “Agreement”), by and among Algoma Steel Group Inc., a corporation
organized under the laws of British Columbia (the “Company”), and the holders of the Shares (as defined below) who are or become party to this Agreement, is effective as of [•], 2021 (the “Effective Date”).
Capitalized terms used without definition shall have the meanings assigned thereto in ARTICLE I. 
 W I T N E S S E T H: 

WHEREAS, reference is made to that certain Agreement and Plan of Merger, dated as of May 24, 2021 (as amended,
supplemented, restated or otherwise modified from time to time, the “Merger Agreement”), by and among, the Company, Algoma Merger Sub, Inc., a Delaware corporation and a direct, wholly-owned subsidiary of the Company
(“Merger Sub”), and Legato Merger Corp., a Delaware corporation (“Legato”), pursuant to which Merger Sub will merge with and into Legato, with Legato surviving as a wholly owned subsidiary of the Company and the
securityholders of Legato becoming securityholders of the Company (the “Merger”). 
 WHEREAS, in connection
with the consummation of the Merger, the Company and the Shareholders desire to enter into this Agreement, which shall govern certain rights, duties and obligations of the parties hereto from and after the Effective Date. 

NOW, THEREFORE, in consideration of the covenants and agreements contained herein, and for other valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, each party hereto, intending to be legally bound hereby, agrees as follows: 

ARTICLE I 
 DEFINITIONS

 Section 1.1 Definitions. 

(a) As used in this Agreement, the following terms have the following meanings: 

“66 2/3% Approval” means the approval by an instrument in writing by Shareholders with Aggregate Ownership of
at least a 66 2/3% of the Shares held by the Shareholders. 
 “Adverse Person” means any Person that the
Board determines in good faith is a competitor or a potential competitor of any of the members of the Company Group. 

“Affiliate” means, with respect to any Person, any other Person directly or indirectly controlling,
controlled by or under common control with such Person; provided that no Shareholder or other securityholder of the Company shall be deemed an Affiliate of the Company or another member of the Company Group or an Affiliate of any other
security holder of the Company solely by reason of any investment in the Company or the existence or exercise of any rights or obligations under this Agreement or the Company Securities held by such 

  
 1 

 
security holder. For the purpose of this definition, the term “control” (including, with correlative meanings, the terms “controlling,” “controlled
by” and “under common control with”), as used with respect to any Person, means the possession, directly or indirectly, of the power to direct or cause the direction of the management and policies of such Person, whether
through the ownership of voting securities, by contract or otherwise; provided that, with respect to a Shareholder, the members of the Company Group shall be deemed to not be Affiliates of such Shareholder (without prejudice to whether a
Shareholder may be deemed to be an Affiliate of a member of the Company Group). 
 “Algoma Shareholder”
means a Shareholder who is not a Legato Founder. 
 “Aggregate Ownership” means, with respect to any
Shareholder or group of Shareholders at any time of determination, the total number of Shares beneficially owned (without duplication) by such Shareholder or group of Shareholders and any Affiliates or Related Funds of such Shareholder or group of
Shareholders as of the date of such calculation. 
 “Archview” means Archview Investment Group LP, together
with its Affiliates and Related Funds that hold Shares. 
 “Bain” means Bain Capital Credit, LP solely in
its capacity as investment adviser for its Related Funds that hold Shares, and such Related Funds. 

“Barclays” means Barclays Bank PLC together with its Affiliates and Related Funds that hold Shares. 

“beneficial owner” has the meaning defined in Rule 13d-3 and Rule 13d-5 of the Exchange Act. “beneficially own,” “beneficially owned” and “beneficial ownership” have correlative meanings. 

“Board” means the board of directors of the Company. 

“Bought Deal” means any of (i) a block trade of Registrable Securities, (ii) an
“overnight” underwritten offering of Registrable Securities without a prior marketing process or (iii) a sale of Registrable Securities by the Company to underwriters for reoffering to the public as described in the definition of
“bought deal agreement” in Section 7.1 of NI 44-101, in each case, pursuant to an agreement among the Company, one or more underwriters and other Persons and a Shelf Prospectus Supplement. For
the avoidance of doubt, any sale of Registrable Securities by a Shareholder to one or more underwriters that does not require a new Registration Filing or Shelf Prospectus Supplement shall be deemed not to be a Bought Deal. 

“Business Day” means any day except a Saturday, Sunday or other day on which commercial banks in (i) New
York City, New York, in the United States of America or (ii) Toronto, Ontario, in Canada, are authorized by law to close. 

“Canada Jurisdictions” means each province of Canada. 

  
 2 

 “Canada Law” means the Business Corporations Act
(British Columbia) from time to time in force and all amendments thereto and includes all regulations and amendments thereto made pursuant to the Business Corporations Act with the definitions and rules of construction in the Interpretation
Act (British Columbia) from time to time in force and all amendments thereto and includes all regulations and amendments thereto made pursuant to Interpretation Act, except, if there is a conflict between a definition in the Business
Corporations Act and a definition or rule in the Interpretation Act, the definition in the Business Corporations Act will prevail. 

“Canada National Securities Exchange” means the Canadian Securities Exchange, Toronto Stock Exchange, TSX
Venture Exchange or NEO Exchange. 
 “Canada Securities Authorities” means the “Canadian securities
regulatory authorities” as defined in National Instrument 14-101—Definitions, and any of their successors. 

“Canada Securities Laws” means all applicable securities laws, the respective regulations, rules and orders
made thereunder, and all applicable policies, instruments and notices issued by the commissions in the Canada Jurisdictions as they may be amended from time to time. 

“Company Group” means the Company and its Subsidiaries (including any present or future direct or indirect
Subsidiaries). 
 “Company Securities” means (i) the Shares, (ii) any securities convertible into
or exchangeable for Shares and (iii) any options, warrants or other rights to acquire Shares. 

“Damages” means any and all losses, claims, damages, liabilities and expenses (including reasonable and
documented expenses of investigation and reasonable attorneys’ fees and expenses). 
 “Exchange Act”
means the Securities Exchange Act of 1934, as amended. 
 “Excluded Registration” means a registration or
qualification (i) on Form S-8, S-4 or F-4, any successor forms or any substantially equivalent forms or prospectuses under
the Canada Securities Laws, or any prospectus under the Canada Securities Laws used exclusively for a similar purpose, (ii) relating to Company Securities issuable upon exercise of employee equity awards or in connection with any employee
benefit or similar plan of the Company, (iii) in connection with a direct or indirect acquisition by the Company of another Person or (iv) in connection with an offering of debt securities of a member of the Company Group convertible into
or exchangeable for capital stock or other securities of a member of the Company Group and any capital stock or other securities of a member of the Company Group issuable upon the conversion or exchange of such debt securities. 

“FINRA” means the Financial Industry Regulatory Authority. 

  
 3 

 “GTAM” means GoldenTree Asset Management LP, solely in its
capacity as investment adviser for its Related Funds that hold Shares, and such Related Funds. 
 “Key
Shareholder” means a Shareholder with Aggregate Ownership of at least [•] Shares.1 

“Legal Action” means any threatened, pending or completed action, suit or proceeding, whether civil,
criminal, administrative or investigative. 
 “Legato Founders” means the holders of the common stock, par
value $0.0001 per share, of Legato, sold by Legato prior to its initial public offering. 
 “Lock-Up Agreement” means that certain lock-up agreement entered into concurrently with the execution of the Merger Agreement, by and among the Company’s sole
shareholder and the Legato Founders. 
 “Majority Approval” means the approval by an instrument in writing
by Shareholders with Aggregate Ownership of at least a majority of the Shares held by the Shareholders. 

“Marathon” means Marathon Asset Management, L.P., solely in its capacity as investment adviser for its
Related Funds that hold Shares, and such Related Funds. 
 “NI
44-101” means National Instrument 44-101—Short Form Prospectus Distributions. 

“NI 44-102” means National Instrument
44-102—Shelf Distributions. 
 “NI 44-103” means National Instrument 44-103—Post-Receipt Pricing. 

“Nomination Right Termination Event” means, with respect to a Shareholder and such Shareholder’s
Nomination Rights, such time that (a) such Shareholder Transfers one or more Shares to a Person (other than an Affiliate or a Related Fund of such Shareholder) or (b) the Company issues additional Shares (other than to an Affiliate or
another member of the Company Group), and immediately following such Transfer or issuance: (i) with respect to the first Nomination Right held by a Shareholder, such Shareholder no longer has an Ownership Percentage of at least 7.36%; or
(ii) with respect to the second Nomination Right held by a Shareholder, such Shareholder no longer has an Ownership Percentage of at least 18.4%, following which, such Nomination Right shall terminate; provided that for purposes of
determining whether a Nomination Right Termination Event has occurred with respect to a Nomination Right held by Marathon and Archview, acting together solely for purposes of exercising Nomination Rights and related rights pursuant to ARTICLE
II, the Ownership Percentages of Marathon and Archview shall be aggregated. 
  

	1 	 Note to Draft: To equal the number of Shares that will be received at closing by a shareholder that
holds 334,000 Shares immediately prior to closing. 

  
 4 

 “Organizational Documents” with respect to a Person means
the articles of association, articles of incorporation, certificate of incorporation, bylaws or any other applicable organizational or formation documents of such Person. 

“Ownership Percentage” means, with respect to a Shareholder, the Aggregate Ownership of such Shareholder
divided by the total number of then-outstanding Shares on the relevant date of determination. 
 “Person”
means an individual, corporation, limited liability company, partnership, association, trust or other entity or organization, including a government or political subdivision or an agency or instrumentality thereof. 

“Preliminary Prospectus” means, (i) with respect to the Securities Act, a preliminary prospectus that is
a part of a Registration Filing filed with the SEC, or (ii) with respect to the Canada Securities Laws, a preliminary prospectus prepared in accordance with applicable Canada Securities Laws of the Canada Jurisdictions in which such preliminary
prospectus is proposed to be filed (which may include, for greater certainty, a preliminary base PREP prospectus prepared in accordance with NI 44-103) and, with respect to a Preliminary Prospectus under
Canada Securities Laws, includes both the English language and French language version thereof, if the Company is, or will pursuant to the Registration Filing become, a reporting issuer in the Province of Quebec. 

“Prospectus” means, (i) with respect to the Securities Act, a final prospectus contained within a
Registration Filing proposed to be filed with the SEC (which includes, for greater certainty, a final prospectus omitting pricing information in accordance with Rule 430A under the Securities Act), or (ii) with respect to the Canada Securities
Laws, a final prospectus prepared in accordance with applicable Canada Securities Laws of the Canada Jurisdictions in which such final prospectus is proposed to be filed (which includes, for greater certainty, a final base PREP prospectus omitting
pricing information in accordance with NI 44-103) and, with respect to a Prospectus under Canada Securities Laws, includes both the English language and French language version thereof, if the Company is, or
will pursuant to the Registration Filing become, a reporting issuer in the Province of Quebec. 
 “Public
Offering” means a public offering of Company Securities pursuant to an effective Registration Filing, other than pursuant to a registration statement on Form S-4, Form
F-4 or Form S-8, any successor form, or any form similar in function or any prospectus used exclusively for a similar purpose under the Canada Securities Laws. 

“Public Offering Launch” means the earlier of (i) the commencement of marketing or a
“roadshow” by underwriters in connection with a Public Offering or (ii) the filing of a Preliminary Prospectus or preliminary Shelf Prospectus Supplement with the SEC or a Canada Securities Authority in which such Preliminary
Prospectus or Shelf Prospectus Supplement contains an estimated price range. 
 “Public Offering Pricing”
means the approval of a price for securities to be sold in a Public Offering by the Company (whether by the Board, a pricing committee thereof or other 

  
 5 

 
Persons to which such approval has been properly delegated), which may be evidenced by the entry into an underwriting agreement or purchase agreement by the Company or any Shareholders selling
securities in the Public Offering. 
 “Registrable Securities” means any Company Securities held by any
Legato Founder or Key Shareholder until: 
 (i) (A) a Registration Filing covering the offering and sale of such Company
Securities has been declared effective by the SEC (or comparable governmental or self-regulatory authority) and such Company Securities have been disposed of pursuant to such effective Registration Filing or (B) a final receipt or equivalent
document for a Prospectus qualifying the distribution of such Company Securities by the Shareholder thereof has been issued by Canada Securities Authorities and such Company Securities have been disposed of pursuant to such Prospectus; 

(ii) such Company Securities have been sold or may be sold to the public by such Shareholder (A) without volume or
manner of sale limitation under Rule 144 or (B) without being subject to any control person sale restrictions or subject to any remaining hold period or seasoning period under the Canada Securities Laws; or 

(iii) such Company Securities are otherwise Transferred and such Company Securities may be resold by the Transferee under the
same circumstances described in the immediately preceding clause (ii). 
 “Registration Expenses” means any
and all expenses incident to the performance of or compliance with any registration, qualification or marketing of Registrable Securities, including all (i) registration, qualification and filing fees, and all other fees and expenses payable in
connection with the listing of securities on any securities exchange or automated interdealer quotation system, (ii) fees and expenses of compliance with any securities laws or “blue sky” laws (including reasonable fees and
disbursements of counsel in connection therewith) of any applicable jurisdiction, (iii) expenses in connection with the preparation, printing, mailing and delivery of any Registration Filing, prospectuses and other documents in connection
therewith and any amendments or supplements thereto, (iv) security engraving and printing expenses, (v) internal expenses of the Company (including all salaries and expenses of its officers and employees performing legal or accounting
duties), (vi) reasonable fees and disbursements of counsel for the Company and customary fees and expenses for independent certified public accountants retained by the Company (including the expenses relating to any comfort letters or costs
associated with the delivery by independent certified public accountants of any comfort letters requested pursuant to Section 3.5(h)), (vii) reasonable fees and expenses of any special experts retained by the Company in
connection with such registration, (viii) reasonable and documented fees, out-of-pocket costs, and expenses of the Shareholders and Shareholders Counsel,
(ix) fees and expenses in connection with any review by FINRA or comparable governmental or self-regulatory authority of the underwriting arrangements or other terms of the offering, and all fees and expenses of any “qualified independent
underwriter,” including the fees and expenses of any counsel thereto, (x) fees and disbursements of underwriters customarily paid by issuers or sellers of securities, but excluding any underwriting fees, discounts and commissions and
transfer taxes attributable to the sale of Registrable Securities, (xi) costs of 

  
 6 

 
printing and producing any agreements among underwriters, underwriting agreements, any “wrapper,” “blue sky” or legal investment memoranda and any selling agreements and other
documents in connection with the offering, sale or delivery of the Registrable Securities, (xii) transfer agents’ and registrars’ fees and expenses and the fees and expenses of any other agent or trustee appointed in connection with
such offering, (xiii) expenses relating to any analyst or investor presentations or any “road shows” undertaken in connection with the registration, marketing or selling of the Registrable Securities, (xiv) fees and expenses
payable in connection with any ratings of the Registrable Securities, including expenses relating to any presentations to rating agencies and (xv) all out-of-pocket
costs and expenses incurred by the Company or its appropriate officers in connection with their compliance with Section 3.5(l). 

“Registration Filing” means, (i) with respect to the Securities Act, any registration statement
promulgated by the SEC, including Form S-1, Form S-3, Form F-1 and Form F-3, and Form F-10; (ii) with respect to the Canada Securities Laws, a Shelf Base Prospectus or Preliminary Prospectus, in each case, including any amendments and supplements thereto, including post-effective amendments, all
exhibits thereto or documents required to be filed therewith, and all materials incorporated by reference therein; and (iii) both (i) and (ii), in the case of a Registration Filing concurrently in both the United States and Canada. 

“Registration Requirements” means, with respect to one or more Legato Founders or Key Shareholders, that such
Legato Founder or Key Shareholder is not able to freely resell Registrable Securities (i) without volume or manner of sale restrictions under Rule 144 or (ii) without being subject to any remaining hold period or seasoning period under the
Canada Securities Laws. 
 “Related Fund” means, with respect to any Person, (i) an Affiliate of such
Person; or (ii) any fund, account or investment vehicle that is controlled, managed, advised or sub-advised by such Person, an Affiliate of such Person, the same investment manager, advisor or sub-advisor of such Person or an Affiliate of such investment manager, advisor or sub-advisor; provided that, with respect to a Shareholder, the members of the Company
Group shall be deemed to not be Related Funds of such Shareholder (without prejudice to whether a Shareholder may be deemed to be a Related Fund of a member of the Company Group). 

“Rule 144” means Rule 144 (or any successor provisions) under the Securities Act. 

“SEC” means the Securities and Exchange Commission. 

“Securities Act” means the Securities Act of 1933, as amended. 

“Securities Requirement” means, for any Shareholder, that the issuance of Company Securities or other
securities to such Shareholder would be in compliance with all applicable securities laws and would not require under applicable law (i) the registration or qualification of such Company Securities or other securities or of any Person as a
broker or dealer or agent with respect to such Company Securities or other securities, or (ii) the provision to such Shareholder of any information that would not be furnished by the issuer of such securities in the applicable transaction if
such Shareholder were an “accredited investor” as defined by Rule 501 promulgated under Regulation D under the Securities Act. 

  
 7 

 “Selling Shareholder Information” means the name of a
Registering Shareholder selling Company Securities pursuant to a Demand Registration or Piggyback Registration, the amount of Company Securities offered and the address and other information (excluding percentages) with respect to such Registering
Shareholder that appear (or are required by applicable law and rule or regulation of an applicable governmental authority or securities exchange) in a table and corresponding footnotes in the Registration Filing, Preliminary Prospectus, Prospectus,
Shelf Base Prospectus or Shelf Prospectus Supplement or any amendment or supplement thereto. 

“Shareholder” means at any time, any Person, together with its Affiliates and Related Funds, (other than a
member of the Company Group) who is a party to or bound by this Agreement, so long as such Person (and such Person’s Affiliates and Related Funds) shall beneficially own any Company Securities. 

“Shareholders Counsel” means one law firm or other legal counsel for all Registering Shareholders selected by
the Registering Shareholders holding at least a majority of the Registrable Securities to be sold for the account of all Registering Shareholders in the offering and one or more local counsels for any of the Registering Shareholders. 

“Shares” means the common shares, without par value, of the Company and any other security into which such
common shares may hereafter be converted or changed. 
 “Shelf Base Prospectus” (i) with respect to the
Securities Act, means a prospectus filed as part of a Registration Filing with the SEC pursuant to a Shelf Registration, or (ii) with respect to the Canada Securities Laws, has the meaning ascribed to “base shelf prospectus” thereto
in NI 44-102. 
 “Shelf Prospectus Supplement” means (i) with
respect to the Securities Act, means a prospectus supplement filed with the SEC with respect to a Registration Filing for which a Shelf Base Prospectus has been filed or (ii) with respect to the Canada Securities Laws, has the meaning ascribed
thereto in NI 44-102. 
 “Shelf Registration” means (i) with
respect to the Securities Act, a proposed registration of securities pursuant to a registration statement on a delayed or continuous offering basis pursuant to Rule 415 or any similar provision that may be adopted by the SEC or (ii) with
respect to the Canada Securities Laws, a Shelf Base Prospectus. 
 “Subsidiary” means, with respect to any
Person, any entity of which securities or other ownership interests having ordinary voting power to elect at least a majority of the board of directors or other persons performing similar functions are at the time directly or indirectly owned by
such Person. 
 “Transfer” means, with respect to any Company Securities, (i) when used as a verb, to
sell, assign, dispose of, exchange, pledge, encumber, hypothecate or otherwise transfer such Company Securities or any participation or interest therein, whether directly or indirectly 

  
 8 

 
(including pursuant to a derivative transaction), or agree or commit to do any of the foregoing, and (ii) when used as a noun, a direct or indirect sale, assignment, disposition, exchange,
pledge, encumbrance, hypothecation, or other transfer of such Company Securities or any participation or interest therein or any agreement or commitment to do any of the foregoing. “Transferred,” “Transferor” and
“Transferee” shall have correlative meanings. 
 “U.S. National Securities Exchange” means
the Nasdaq Global Select Market, Nasdaq Global Market, Nasdaq Capital Market, New York Stock Exchange or NYSE MKT. 
 (b)
Each of the following terms is defined in the Section set forth opposite such term: 
  

			
	 Term
	  	Section
	 Agreement
	  	Preamble
	 Board Observer
	  	2.6
	 Company
	  	Preamble
	 Demand Registration
	  	3.1(a)
	 D&O Exculpated Parties
	  	2.7(a)
	 Nomination Right
	  	2.1(a)
	 Effective Date
	  	Preamble
	 Indemnified Party
	  	3.8
	 Indemnifying Party
	  	3.8
	 Inspectors
	  	3.5(g)
	 issuer free writing prospectus
	  	3.6
	 Institutional Indemnitors
	  	2.8(a)
	 Maximum Offering Size
	  	3.1(e)
	 PFIC
	  	4.2(a)
	 Piggyback Registration
	  	3.2(a)
	 Records
	  	3.5(g)
	 Registering Shareholders
	  	3.1(a)
	 Replacement Nominee
	  	2.2(a)
	 Requesting Shareholder
	  	3.1(a)
	 road show
	  	3.6
	 Shareholder Nominee
	  	2.1(a)

 Section 1.2 Other Definitional and Interpretative Provisions. The words
“hereof,” “herein” and “hereunder” and words of like import used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement. The captions herein are included for
convenience of reference only and shall be ignored in the construction or interpretation hereof. References to Articles, Sections, Exhibits and Schedules are to Articles, Sections, Exhibits and Schedules of this Agreement unless otherwise specified.
All Exhibits and Schedules annexed hereto or referred to herein are hereby incorporated in and made a part of this Agreement as if set forth in full herein. Any capitalized terms used in any Exhibit or Schedule but not otherwise defined therein,
shall have the meaning as defined in this Agreement. Any singular term in this Agreement shall be deemed to include the plural, and any plural term the singular. Whenever the words “include,” “includes” or “including”
are used in this Agreement, they shall be deemed to be followed by the words “without limitation,” whether or not they are in fact 

  
 9 

 
followed by those words or words of like import. “Writing,” “written” and comparable terms refer to printing, typing and other means of reproducing words (including electronic
media) in a visible form. References to any agreement or contract are to that agreement or contract as amended, modified or supplemented from time to time in accordance with the terms hereof and thereof; provided that with respect to any
agreement or contract listed on any schedules hereto, all such amendments, modifications or supplements must also be listed in the appropriate schedule. References to any law include all rules and regulations promulgated thereunder. References to
any Person include the successors and permitted assigns of that Person. References from or through any date mean, unless otherwise specified, from and including or through and including, respectively. Any references to a certain number of Shares
shall be subject to appropriate adjustment in the event of any stock dividend, stock split, combination or other similar recapitalization with respect to the Shares after the Effective Date. 

ARTICLE II 
 CORPORATE
GOVERNANCE 
 Section 2.1 Nomination Rights. 

(a) Subject to the nomination of the persons who will serve as the initial Board on the Effective Date pursuant to the Merger
Agreement and Section 2.1(d) hereof, each of (i) Bain, (ii) Barclays, (iii) GTAM and (iv) Marathon and Archview, with Marathon and Archview acting together solely for purposes of exercising Nomination Rights
and related rights pursuant to this ARTICLE II but all of such Shareholders otherwise acting separately, shall have the right (each, a “Nomination Right”) to nominate one director to the Board (a “Shareholder
Nominee”) until the occurrence of a Nomination Right Termination Event with respect to such Shareholder’s Nomination Right. If a Nomination Right Termination Event has occurred at a time when a Shareholder Nominee nominated pursuant to
the Nomination Right is serving on the Board, the affected Shareholder shall cause such Shareholder Nominee to offer his or her resignation to the Board at least 60 days prior to the expected date of the Company’s next meeting of shareholders
called for the purpose of electing directors, which resignation may be effective as of the date of the shareholder meeting. Notwithstanding the foregoing, the Board (or a committee thereof) may, in its sole discretion, recommend for nomination any
Shareholder Nominee that has tendered his or her resignation in accordance with this Section 2.1(a). 

(b) Any Shareholder with a Nomination Right that acquires Shares such that after such acquisition such Shareholder has an
Ownership Percentage of at least 18.4% shall automatically receive a second Nomination Right until such time as a Nomination Right Termination Event occurs with respect to such second Nomination Right; provided that no Shareholder shall have
or exercise more than two Nomination Rights, regardless of its Ownership Percentage. 
 (c) The Company agrees, to the
fullest extent permitted by applicable law, to and to use its reasonable best efforts to cause the directors to: (i) include in the slate of nominees recommended by the Board or any committee thereof for election at any meeting of shareholders
called for the purpose of electing directors the Shareholder Nominees and to nominate and recommend the Shareholder Nominees to be elected as directors as provided herein and (ii) include the Shareholder Nominees in the information circular
prepared by the Company in 

  
 10 

 
connection with the Company’s solicitation of proxies or consents in favor of director nominees for every meeting of the shareholders of the Company called with respect to the election of
members of the Board, and at every adjournment or postponement thereof, and on every action or approval by written resolution of the shareholders of the Company or the Board with respect to the election of members of the Board, (iii) enable any
Shareholder with Nomination Rights to nominate for election a Shareholder Nominee, whether by increasing the size of the Board or otherwise, or nominate a Shareholder Nominee to fill any newly created vacancy, provided such vacancy is not
caused by the death, disability, retirement, resignation, removal (with or without cause) or otherwise of a director for which a Shareholder has a Nomination Right, in which case such Shareholder will be entitled to nominate a Replacement Nominee
pursuant to Section 2.2, (iv) take all actions necessary at any time and from time to time so that a Shareholder Nominee will not be removed from the Board without the approval of the Shareholder that nominated such
Shareholder Nominee, and (v) use the same efforts to cause the election of Shareholder Nominee as it uses to cause other nominees recommended by the Board to be elected, including soliciting proxies or consents in favor thereof. 

Section 2.2 Vacancies. If, as a result of death, disability, retirement, resignation, removal (with or without
cause) or otherwise, there shall exist or occur any vacancy on the Board: 
 (a) a Shareholder with a Nomination Right to
nominate such director or manager whose death, disability, retirement, resignation or removal resulted in such vacancy, shall have the exclusive right to nominate another individual (such Person, the “Replacement Nominee”) to
fill such vacancy and serve as a director on the Board by providing written notice thereof to the Company; 
 (b) if no
shareholder action is required under applicable law to appoint a Replacement Nominee, the Company will take all steps necessary to cause the appointment of the Replacement Nominee; 

(c) if shareholder action is required under applicable law to appoint a Replacement Nominee, the Company shall use its
reasonable best efforts to cause such Replacement Nominee to be elected to the Board, as soon as reasonably practicable, and the Company shall take or cause to be taken, to the fullest extent permitted by applicable law, at any time and from time to
time, all actions necessary to accomplish the same; and 
 (d) a Replacement Nominee shall be treated as a Shareholder
Nominee for all purposes of this Agreement. 
 Section 2.3 Compensation. 

(a) The Company (or a Subsidiary) shall pay all reasonable
out-of-pocket expenses incurred by each Shareholder Nominee or any Board Observer in connection with attending regular and special meetings of the Board or board of
directors, board of managers or similar governing body of any member of the Company Group or any committee thereof. 
 (b)
Except to the extent a Shareholder with Nomination Rights may otherwise notify the Company, a Shareholder Nominee nominated by such Shareholder shall be 

  
 11 

 
entitled to compensation consistent with the compensation received by other members of the Board who are not employees of the Company, including any fees and equity awards, provided, that
at the election of a Shareholder Nominee, any director compensation (whether cash, equity awards and/or cash in lieu of equity as may be designated by such Shareholder Nominee) shall be paid to the Shareholder that nominated such Shareholder Nominee
or an Affiliate thereof specified by such Shareholder Nominee rather than to such Shareholder Nominee. 
 Section 2.4
Organizational Document Provisions. The Organizational Documents of the Company shall provide for (a) the elimination of liability of each director on the Board to the maximum extent permitted by applicable law and
(b) indemnification of, and advancement of expenses for, each director on the Board for acts on behalf of a member of the Company Group to the maximum extent permitted by applicable law. 

Section 2.5 Notice of Meeting. The Company agrees to give each director (by email or otherwise) notice and the agenda for
each meeting of the Board or any committee thereof at least 24 hours prior to such meeting. 
 Section 2.6 Board
Observers. Any Shareholder with one or more Nomination Rights shall have the right, exercisable by delivering written notice to the Company (or the Board), and subject to the prior written consent of the Board (which shall not be unreasonably
withheld), to designate one nonvoting observer (a “Board Observer”) to attend meetings of the Board and any committees thereof and any boards of directors (or similar governing body) of any member of the Company Group and any
committee thereof; provided that, in the event such consent is not given for a Board Observer, such Shareholder may designate a different Person as a Board Observer, subject to the prior written consent of the Board, which shall not be
unreasonably withheld. In connection with the designation of a Board Observer, the Company may require such Board Observer to enter into a written agreement with respect to confidentiality and other customary matters for board observers; provided
that any such agreement shall be on terms reasonably acceptable to Shareholder or Shareholders designating such Board Observer. Any Board Observer shall be permitted to attend any meeting of the Board or any committee thereof or any boards of
directors (or similar governing body) of any member of the Company Group or any committee thereof, in each case, using the same form of communication permitted for members of such board or any committee thereof, and the applicable member of the
Company Group shall provide notice and all written materials to the Board Observers for any meeting in the same form, and at the same time, as the director or manager of the applicable member of the Company Group receives; provided that the
Board Observer may be excluded from access to any material or meeting or portion thereof if the Board or any Subsidiary board, as applicable, determines in good faith, upon advice of legal counsel, that such exclusion is reasonably necessary to
prevent a waiver of any attorney-client privilege or necessary to prevent a conflict of interest with respect to the fiduciary duties of the directors, managers or other members. 

Section 2.7 Exculpation; Indemnification; D&O Insurance. 

(a) To the maximum extent permitted by applicable law, no member of the Board or any other board of directors or managers of a
member of the Company Group, or Board Observer (and the heirs, executors or administrators of such Person) (the “D&O Exculpated Parties”) shall be liable to any other D&O Exculpated Party, member of the Company

  
 12 

 
Group or any Shareholder for any loss suffered by any member of the Company Group or any Shareholder unless such loss is caused by such D&O Exculpated Party’s fraud, willful misconduct,
violation of law. The D&O Exculpated Parties shall not be liable for errors in judgment or for any acts or omissions that do not constitute fraud, willful misconduct, a violation of law or a material breach of this Agreement or the
Organizational Documents of the members of the Company Group. Any D&O Exculpated Party may consult with counsel, accountants and any Shareholder, director, manager, employee or committee of any member of the Company Group or any other
professional expert, and provided the D&O Exculpated Party acts in good-faith reliance upon the advice or opinion of any such counsel, accountants or other professional expert, the D&O Exculpated Party shall not be liable for any loss
suffered by any other D&O Exculpated Party, any member of the Company Group or any Shareholder in reliance thereon. Each D&O Exculpated Party is an express third-party beneficiary of the rights conferred thereto in this
Section 2.7(a). 
 (b) Each Person (and the heirs, executors or administrators of such Person) who
was or is a party or is threatened to be made a party to, or is involved in, any Legal Action, by reason of the fact that such Person is or was a director, manager or officer of a member of the Company Group or is or was serving at the request of a
member of the Company Group as a director, manager or officer of another company, corporation, partnership, joint venture, trust or other enterprise (the “D&O Indemnified Parties”), shall be indemnified and held harmless by the
members of the Company Group to the fullest extent permitted by applicable law, including to the extent of any Damages caused by, related to or arising from, such Legal Action, whether arising prior to, on or after the Effective Date. The right to
indemnification conferred in this Section 2.7(b) shall also include the right to be paid by the members of the Company Group the expenses incurred in connection with any such Legal Action in advance of its final disposition
to the fullest extent authorized by applicable law. Each D&O Indemnified Party is an express third-party beneficiary of the rights conferred thereto in this Section 2.7(b). 

(c) The Company or any other appropriate member of the Company Group will purchase, and will use commercially reasonable
efforts to maintain, director and officer liability insurance in such amounts and such limits as reasonably determined by the Board on behalf of any Person who is or was a director on the Board or any other board of directors or managers of a member
of the Company Group against any liability asserted against such Person or incurred by such Person in any capacity as such, whether or not any of the members of the Company Group would have the power to indemnify such Person against that liability
under any of the Organizational Documents of the members of the Company Group. 
 (d) Neither the amendment nor repeal of
this Section 2.7, nor the adoption of any provision of this Agreement or any Organizational Document of a member of the Company Group, nor, to the fullest extent permitted by applicable law, any modification of law, shall
adversely affect any right or protection of any Person granted pursuant hereto existing at, or arising out of or related to any event, act or omission that occurred prior to, the time of such amendment, repeal, adoption or modification (regardless
of when any proceeding (or part thereof) relating to such event, act or omission arises or is first threatened, commenced or completed). The rights to exculpation, indemnification and the advancement and payment of expenses conferred in this
Section 2.7 shall not exclude any other right which a D&O Exculpated Party or D&O Indemnified Party may have or hereafter acquire under any law (common or statutory), this Agreement or the Organizational Documents
of the members of the Company Group, any vote of 

  
 13 

 
Shareholders or disinterested directors or managers, or otherwise, but each D&O Exculpated Party and D&O Indemnified Party shall not be entitled to recover more than once for the same
loss, cost or expense in respect of which it is otherwise entitled to indemnification under this Section 2.7. If this Section 2.7 shall be invalidated on any ground by any court of competent
jurisdiction, then the members of the Company Group shall nevertheless indemnify and hold harmless each D&O Indemnified Party pursuant to this Section 2.7 as to any Damages to the fullest extent permitted by this
Section 2.7 and applicable law. Each D&O Exculpated Party and D&O Indemnified Party is an express third- party beneficiary of the rights conferred thereto in this Section 2.7(d). 

Section 2.8 Priority of Indemnification. 

(a) Each member of the Company Group hereby acknowledge that the D&O Indemnified Parties nominated pursuant to this
ARTICLE II may have certain rights to indemnification, advancement of expenses or insurance provided by the Shareholders that nominated such directors, managers or Board Observers pursuant to Nomination Rights or otherwise and certain of
their Affiliates or Related Funds or their Affiliates’ and Related Funds’ respective partners (whether general, limited or otherwise), shareholders, members, directors, officers, fiduciaries, managers, members, controlling Persons,
employees and agents (collectively, the “Institutional Indemnitors”). Each member of the Company Group hereby agrees (i) that they are the indemnitors of first resort (i.e., their obligations to such D&O Indemnified
Parties are primary and any obligation of the Institutional Indemnitors to advance expenses or to provide indemnification for the same expenses or liabilities incurred by such D&O Indemnified Parties are secondary), (ii) that they shall be
required to advance the full amount of expenses incurred by such D&O Indemnified Parties and shall be liable for the full amount of all expenses, judgments, penalties, fines and amounts paid in settlement to the extent legally permitted and as
required by the terms of the Organizational Documents of any member of the Company Group (or any other agreement between a member of the Company Group and such D&O Indemnified Parties), without regard to any rights such D&O Indemnified
Parties may have against the Institutional Indemnitors, and (iii) that they irrevocably waive, relinquish and release the Institutional Indemnitors from any and all claims against the Institutional Indemnitors for contribution, subrogation or
any other recovery of any kind in respect thereof. Each member of the Company Group further agrees that no advancement or payment by the Institutional Indemnitors on behalf of such D&O Indemnified Parties with respect to any claim for which such
D&O Indemnified Parties have sought indemnification from a member of the Company Group shall affect the foregoing and the Institutional Indemnitors shall be subrogated to the extent of such advancement or payment to all of the rights of recovery
of such D&O Indemnified Parties against a member of the Company Group. 
 (b) No Institutional Indemnitor shall have any
liability as a result of nominating a D&O Indemnified Party, or for any act or omission by such nominated D&O Indemnified Party in his or her capacity as a director, manager, officer or Board Observer, as applicable. Each of the
Institutional Indemnitors is an express third- party beneficiary of the rights conferred thereto in this Section 2.8. 

  
 14 

 ARTICLE III 

REGISTRATION RIGHTS 

Section 3.1 Demand Registration. 

(a) If at any time and from time to time on or after the date hereof, the Company shall receive a request from one or more
Legato Founders or Key Shareholders (such Legato Founders or Key Shareholders, collectively, the “Requesting Shareholders”) that the Company, (i) effect a registration under the Securities Act if any Registrable Securities are
listed on a U.S. National Securities Exchange or the Company is otherwise subject to Section 13 or 15(d) of the Exchange Act, or (ii) effect a qualification for distribution by prospectus under Canada Securities Laws if any Registrable
Securities are listed on a Canada National Securities Exchange or the Company is a reporting issuer in any province or territory of Canada under Canada Securities Laws, of all or any portion of the Requesting Shareholder’s Registrable
Securities, specifying the intended method of disposition thereof, including whether to be conducted via an underwritten offering (each such request shall be referred to herein as a “Demand Registration”). The Company shall use its
commercially reasonable efforts to effect, as expeditiously as possible, the filing of a Registration Filing and the effectiveness of the Demand Registration, or the filing of a prospectus under Canada Securities Laws and the issuance of a final
receipt for such prospectus, or both, subject to the restrictions set forth in this ARTICLE III. The Company shall give reasonably prompt notice of a Demand Registration (and in no event later than 15 Business Days or 4 Business Days in the
case of a Bought Deal prior to the anticipated filing date of the Registration Filing relating to such Demand Registration) to the other Legato Founders and Key Shareholders with respect to all other Registrable Securities of the same class as those
requested to be registered by the Requesting Shareholders (all such Legato Founders and Key Shareholders, together with the Requesting Shareholders, and any other Shareholders participating in a Demand Registration or Piggyback Registration, the
“Registering Shareholders”) that such Shareholders have the right to request the Company to register by request received by the Company within 10 Business Days, or 2 Business Days in the case of a Bought Deal, after the date of the
Company’s notice of the Demand Registration, and the Company shall use commercially reasonable efforts to include all Registrable Securities requested to be registered by the Registering Shareholders in such Registration Filing. Notwithstanding
the foregoing, the Company shall not be obligated to effect a Demand Registration (i) unless the aggregate proceeds expected to be received from the sale of the Registrable Securities requested to be included in such Demand Registration equals
or exceeds C$50,000,000 and (ii) if the Company shall have effected a Demand Registration or Piggyback Registration in which Legato Founders and Key Shareholders had the opportunity to sell Registrable Securities within the six-month period prior to receipt of the Demand Registration. 
 (b) At any time prior to
the Public Offering Launch of a Demand Registration, the Requesting Shareholders may revoke such request, without liability to any of the other Registering Shareholders, by providing a notice to the Company revoking such request. 

(c) The Company shall be liable for and pay all Registration Expenses in connection with any Demand Registration, regardless
of whether such Demand Registration is completed. 
 (d) A Demand Registration shall be deemed not to have occurred: 

  
 15 

 (i) unless the Public Offering Pricing has been completed and a final
Prospectus or Shelf Prospectus Supplement relating to the applicable Registration Filing containing pricing information has been filed with the SEC or one or more Canada Securities Authorities; provided that a Demand Registration shall be
deemed not to have occurred if either (1) such Registration Filing is interfered with by any cease trade or stop order, injunction or other order or requirement of the SEC, a Canada Securities Authority or any other governmental agency or court
or (2) less than 75% of the Registrable Securities included in such Registration Filing have been sold thereunder; or 

(ii) if the Maximum Offering Size is reduced in accordance with Section 3.1(e) such that less than
75% of the Registrable Securities of the Requesting Shareholders sought to be included in such registration are included. 

(e) If a Demand Registration involves an underwritten Public Offering and the managing underwriters advise the Company and the
Registering Shareholders that, in their view, the amount of Registrable Securities requested to be included in such Demand Registration (including any securities that the Company proposes to include) exceeds the largest amount of Registrable
Securities that can be sold without having an adverse effect on such offering, including the price at which such Registrable Securities can be sold (the “Maximum Offering Size”), the Company shall include in such registration, in
the priority listed below, up to the Maximum Offering Size: 
 (i) first, all Registrable Securities requested to be
registered by the Registering Shareholders (allocated, if necessary for the offering not to exceed the Maximum Offering Size, pro rata among such Persons on the basis of the relative number of Registrable Securities beneficially owned by such
Registering Shareholders); and 
 (ii) second, any securities proposed to be registered by any other Persons (including the
Company), with such priorities among them as the Company shall determine. 
 (f) The Company may postpone effecting a Demand
Registration on one occasion during any period of twelve consecutive months for a reasonable time specified in the notice but not exceeding 120 days (which period may not be extended or renewed), if the Company provides a certificate signed by the
principal executive officer of the Company stating that in the good faith judgement of the Board that (A) the Company is in possession of material non-public information the disclosure of which during the
period specified in such notice the Company reasonably believes would not be in the best interests of the Company or (B) that it would otherwise be seriously detrimental to the Company and its shareholders for such Demand Registration to be
effected at such time. It is agreed that the existence or anticipation of a material acquisition or financing activity will be sufficient reason for the Company to postpone a Demand Registration. 

(g) At any time that Legato Founders or Key Shareholders may request a Demand Registration, upon the request of one or more
Legato Founders or Key Shareholders that satisfy the Registration Requirements, the Company shall use its commercially reasonable efforts to file a Registration Filing for a Shelf Registration with respect to the Registrable Securities

  
 16 

 
and to cause such Shelf Registration to become effective. Any request for the Company to prepare and file a Shelf Prospectus Supplement pursuant to a Shelf Registration in any underwritten Public
Offering shall be deemed to be a Demand Registration subject to the provisions of Section 3.1(a); provided that none of (x) the filing of a Shelf Base Prospectus or (y) the filing of Shelf Prospectus
Supplement that does not relate to an underwritten Public Offering and is only for the purpose of updating a Shelf Base Prospectus with the identities of any selling shareholders, the amounts of securities to be sold and any related information
required by the applicable Registration Filing, shall constitute a Demand Registration. The Company shall give notice of any Shelf Registration pursuant to the procedures in Section 3.1(a). 

Section 3.2 Piggyback Registration. 

(a) If at any time the Company proposes to effect a Registration Filing under the Securities Act (other than an Excluded
Registration) or under the Canada Securities Laws, whether or not for sale for its own account, the Company shall each such time give prompt notice at least 10 Business Days, or 4 Business Days in the case of a Bought Deal, prior to the anticipated
filing date of the Registration Filing relating to such registration to each Legato Founder and Key Shareholder, which notice shall set forth such Legato Founder’s and Key Shareholder’s rights under this
Section 3.2 and shall offer such Legato Founder and Key Shareholder the opportunity to include in such Registration Filing the number of Registrable Securities of the same class or series as those proposed to be registered
as each such Legato Founder and Key Shareholder may request (a “Piggyback Registration”), subject to the provisions of Section 3.2(b). Upon the request of any such Legato Founder or Key Shareholder made
within 10 Business Days, or 2 Business Days in the case of a Bought Deal, after the receipt of notice from the Company (which request shall specify the number of Registrable Securities intended to be registered by such Legato Founder or Key
Shareholder), the Company shall use its commercially reasonable efforts to effect a Registration Filing for all Registrable Securities that the Company has been so requested to register by all such Registering Shareholders; provided that
(i) if such registration involves an underwritten Public Offering, all such Registering Shareholders must sell their Registrable Securities to the underwriters selected as provided in Section 3.5(f)(i) on the same
terms and conditions as apply to the Company or the Requesting Shareholders, as applicable, and (ii) if, at any time after giving notice of its intention to register any Registrable Securities pursuant to this
Section 3.2(a) and prior to the Public Offering Pricing for such Piggyback Registration, the Company shall determine for any reason not to register such Registrable Securities, the Company shall give notice to all such
Registering Shareholders and, thereupon, shall be relieved of its obligation to register any Registrable Securities in connection with such Registration Filing. The Company shall pay all Registration Expenses in connection with each Piggyback
Registration. 
 (b) If a Piggyback Registration involves an underwritten Public Offering (other than any Demand
Registration, in which case the provisions with respect to priority of inclusion in such offering set forth in Section 3.1(e) shall apply) and the managing underwriters advise the Company that, in its view, the number of
Registrable Securities that the Company and such Registering Shareholders intend to include in such registration exceeds the Maximum Offering Size, the Company shall include in such registration, in the following priority, up to the Maximum Offering
Size: 

  
 17 

 (i) first, so much of the Registrable Securities proposed to be registered
for the account of the Company as would not cause the offering to exceed the Maximum Offering Size; 
 (ii) second, all
Registrable Securities requested to be included in such registration by any Registering Shareholders pursuant to Section 3.2 (allocated, if necessary for the offering not to exceed the Maximum Offering Size, pro rata among
such Registering Shareholders on the basis of the relative amount of Registrable Securities so requested to be included in such registration by each); and 

(iii) third, any securities proposed to be registered for the account of any other Persons with such priorities among them as
the Company shall determine. 
 Section 3.3 Restriction on Demand Registration and Piggyback Registration. For
the avoidance of doubt and notwithstanding anything to the contrary contained in this Agreement or the effectiveness of any Registration Statement, no sales of Registrable Securities shall be effected by any Shareholder until after the expiration of
the applicable lock-up period in accordance with the Lock-Up Agreement. 

Section 3.4 Transfer Restrictions. 

(a) Subject to Section 3.4(c), in connection with any underwritten Public Offering and if required
by the Board after consultation with the managing underwriters, no Registering Shareholder that is selling securities in such Public Offering shall Transfer any Company Securities (or any securities convertible into or exchangeable or exercisable
for such Company Securities), other than any Company Securities sold to the managing underwriters, or exercise any registration rights with respect to such Company Securities from the Public Offering Launch for up to 90 days (or such shorter time as
determined by the managing underwriters) following the date of a final Prospectus or Shelf Prospectus Supplement filed for such Public Offering. 

(b) Any Person restricted under this Section 3.4 shall execute a customary lock-up agreement with the underwriters, which shall be consistent with the provisions described under this Section 3.4 and otherwise provide for customary exceptions as negotiated by the
Company with the managing underwriters. Any such executed lock-up agreement shall be deemed to replace the restrictions under Section 3.4. 

(c) No Shareholder shall be subject to the restrictions of this Section 3.4 unless all members of
the Board, all officers of the Company, all Shareholders selling securities in such Public Offering are subject to this Section 3.4 or similar lock-up restrictions. If the Company or
the underwriters grant a waiver or release under this Section 3.4, any lock-up agreement or any substantially similar restrictions to (i) any Person or entity that beneficially
owns 1% or more of the outstanding capital stock of the Company or (ii) any member of the Board or officer of the Company, then all Shareholders shall be deemed to receive the same waiver or release to the same extent and on the same terms as
such other Person for the same number of Company Securities as waived or released for such other Person; provided that if such waiver is in connection with a 

  
 18 

 
follow-on Public Offering, then such waiver shall only apply with respect to a Shareholder’s sales in such
follow-on Public Offering so long as such Shareholder is given the opportunity to participate in such Public Offering on a ratable basis as all other Shareholders; provided further that this
Section 3.4(c) shall not apply (x) to any waiver or release for hardship as reasonably determined by the managing underwriters or the Board; (y) with respect to any “net” or “cashless”
exercise, or with respect to any dispositions solely to cover taxes or the payment of any exercise price, in connection with any equity awards; or (z) until holders of at least 2% of the outstanding capital stock of the Company have been
granted such waiver or release. 
 Section 3.5 Registration Procedures. In the event of a Demand Registration or
Piggyback Registration, the Company shall use its commercially reasonable efforts to effect the registration and the sale of all Registrable Securities requested to be included by any Registering Shareholders in accordance with the intended method
of disposition thereof as quickly as practicable, and, in connection with any such request: 
 (a) The Company shall as
promptly as reasonably possible prepare and file a Registration Filing on any form for which the Company then qualifies or that counsel for the Company shall deem appropriate and which form shall be available for the sale of the Registrable
Securities to be registered thereunder in accordance with the intended method of distribution thereof, and use its commercially reasonable efforts (i) to cause such filed Registration Filing to become and remain effective, until the earlier of
(A) the time at which all of the Registrable Securities of the Registering Shareholders included in such Registration Filing shall have actually been sold thereunder and (B) in the case of a Shelf Registration, three years or, in the case
of any other Demand Registration, the time at which the offering contemplated by such Registration Filing (upon the advice of the underwriters participating in such offering, if applicable) is terminated; and (ii) to cause a final receipt for
any Canadian prospectus relating to such Registration Filing to be issued by the applicable Canada Securities Authorities and remain available for use until the earlier of (X) the time at which all of the Registrable Securities of the
Registering Shareholders included in such Registration Filing shall have actually been sold thereunder and (Y) in the case of a Shelf Registration, twenty-five months or, in the case of any other Demand Registration, the time at which the
offering contemplated by such Registration Filing (upon the advice of the underwriters participating in such offering, if applicable) is terminated. 

(b) Prior to filing a Registration Filing, Preliminary Prospectus, Prospectus, Shelf Base Prospectus, Shelf Prospectus
Supplement, or any amendment or supplement thereto, or any free writing prospectus or any other filing (in each case including all exhibits thereto and documents incorporated by reference therein) related to such Registration Filing, the Company
shall, if requested, furnish to Shareholders Counsel, each Registering Shareholder and each underwriter, if any, and such underwriter’s counsel, copies of such Registration Filing or other document as proposed to be filed, and thereafter the
Company shall also furnish such number of copies of such Registration Filing or other document as Shareholders Counsel, such Registering Shareholder, underwriter or underwriter’s counsel may reasonably request. Each Registering Shareholder
shall have the right to request that the Company modify any information contained in such Registration Filing or other document pertaining to such Registering Shareholder and the Company shall use its commercially reasonable efforts to comply with
such request; provided, however, that the Company shall not have any obligation to so modify 

  
 19 

 
any information if the Company reasonably expects that so doing would cause the applicable document to contain an untrue statement of a material fact or omit to state any material fact required
to be stated therein or necessary to make the statements therein not misleading. 
 (c) After the filing of the
Registration Filing, the Company shall (i) cause the related Preliminary Prospectus or Shelf Base Prospectus to be supplemented by any required Prospectus or Shelf Prospectus Supplement or any amendment or other supplement, and, as so amended
or supplemented, to be filed, (ii) comply with the provisions of the Securities Act or the Canada Securities Laws, or both, as applicable, with respect to the disposition of all Registrable Securities covered by such Registration Filing during
the applicable period in accordance with the intended methods of disposition by the Shareholders thereof set forth in such Registration Filing, as amended or supplemented, and (iii) promptly notify each Shareholder holding Registrable
Securities covered by such Registration Filing of any cease trade or stop order, injunction or other order issued or threatened by the SEC, a Canada Securities Authority or any other governmental authority or court and take all reasonable actions
required to prevent the entry of such order or injunction or to remove it if entered. 
 (d) The Company shall use its
commercially reasonable efforts to (i) register or qualify the Registrable Securities covered by such Registration Filing under such U.S. state “blue sky” laws, or the Canada Securities Laws of any provinces or territories of Canada
in which the Company is not already a reporting issuer (including, for greater certainty, the Province of Quebec), or such other securities laws as any Registering Shareholder holding such Registrable Securities reasonably (in light of such
Registering Shareholder’s intended plan of distribution) requests and (ii) cause such Registrable Securities to be registered with or approved by such other governmental agencies or authorities as may be necessary by virtue of the business
and operations of the Company and do any and all other acts and things that may be reasonably necessary or advisable to enable such Registering Shareholder to consummate the disposition of the Registrable Securities owned by such Registering
Shareholder; provided that the Company shall not be required to (A) qualify generally to do business in any jurisdiction where it would not otherwise be required to qualify but for this Section 3.5(d), (B)
subject itself to taxation in any such jurisdiction or (C) consent to general service of process in any such jurisdiction. 

(e) The Company shall immediately notify each Registering Shareholder holding such Registrable Securities covered by such
Registration Filing, at any time when a Prospectus or Shelf Prospectus Supplement relating thereto is required to be delivered under the Securities Act or Canada Securities Laws, of the occurrence of an event requiring the preparation of a
supplement or amendment to such Prospectus or Shelf Prospectus Supplement so that, as thereafter delivered to the purchasers of such Registrable Securities, such Prospectus or Shelf Prospectus Supplement will not contain an untrue statement of a
material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading, or in the case of a prospectus under Canada Securities Laws, will not contain a misrepresentation within the
meaning of Canada Securities Laws, and promptly prepare and make available to each such Registering Shareholder and file with the SEC and, if applicable, Canada Securities Authorities, any such supplement or amendment. Each Registering Shareholder
agrees that, upon receipt of any notice from the Company of the happening of any event of the kind described in this Section 3.5(e), such Registering Shareholder shall forthwith discontinue disposition of Registrable
Securities pursuant to the Registration Filing covering such Registrable 

  
 20 

 
Securities until such Registering Shareholder’s receipt of the copies of the supplemented or amended Prospectus or Shelf Prospectus Supplement contemplated by
Section 3.5(e). If the Company shall give such notice, the Company shall make such supplement or amendment available as promptly as reasonably possible and shall extend the period during which such registration statement
shall be maintained effective (including the period referred to in Section 3.5(a)) by the number of days during the period from and including the date of the giving of notice pursuant to this
Section 3.5(e) to the date when the Company shall make available to such Registering Shareholder a Prospectus or Shelf Prospectus Supplement supplemented or amended to conform with the requirements of
Section 3.5(e). 
 (f) (i) The Requesting Shareholders shall have the right, in their sole
discretion, to select an underwriter or underwriters in connection with any Public Offering resulting from the exercise of a Demand Registration, which underwriter or underwriters may include any Affiliate of any Requesting Shareholder; and
(ii) the Company shall have the right, in its sole discretion, to select an underwriter or underwriters in connection with any other Public Offering, including a Piggyback Registration. In connection with any Public Offering, the Company shall
enter into customary agreements (including an underwriting agreement in customary form) and take such all other actions as are reasonably required in order to expedite or facilitate the disposition of such Registrable Securities in any such Public
Offering, including the engagement of a “qualified independent underwriter” in connection with the qualification of the underwriting arrangements with FINRA. 

(g) Upon execution of confidentiality agreements in form and substance reasonably satisfactory to the Company, the Company
shall make available for inspection by any Shareholders Counsel, any Registering Shareholder and any underwriter participating in any disposition pursuant to a Registration Filing being filed by the Company pursuant to this
Section 3.5 and any attorney, accountant or other professional retained by any such Legato Founder, Key Shareholder or underwriter (collectively, the “Inspectors”), all financial and other records,
pertinent corporate documents and properties of the Company (collectively, the “Records”) as shall be reasonably necessary or desirable to enable them to exercise their due diligence responsibility, and cause the Company’s
officers, directors and employees to supply all information reasonably requested by any Inspectors in connection with such Registration Filing. Records that the Company determines, in good faith, to be confidential and that it notifies the
Inspectors are confidential shall not be disclosed by the Inspectors unless (i) the disclosure of such Records is necessary to avoid or correct a misstatement or omission, or misrepresentation within the meaning of Canada Securities Laws, in
such Registration Filing or (ii) the release of such Records is ordered pursuant to a subpoena or other order from a court of competent jurisdiction. Each Registering Shareholder agrees that information obtained by it as a result of such
inspections shall be deemed confidential and shall not be used by it or its Affiliates as the basis for any market transactions in the Registrable Securities unless and until such information is made generally available to the public. Each
Registering Shareholder further agrees that, upon learning that disclosure of such Records is sought in a court of competent jurisdiction, it shall give notice to the Company and allow the Company, at its expense, to undertake appropriate action to
prevent disclosure of the Records deemed confidential 
 (h) If requested by the managing underwriters in an underwritten
Public Offering, the Company shall furnish to each underwriter (i) an opinion or opinions of legal counsel 

  
 21 

 
to the Company (including, for greater certainty, in the case of a Registration Filing made with the SEC, negative assurance letters or “10b-5
negative assurance letters”) and (ii) a comfort letter or comfort letters from the Company’s independent public accountants, each in customary form and covering such matters of the kind customarily covered by opinions or comfort
letters, as the case may be, as the managing underwriters reasonably request. 
 (i) The Company shall otherwise use its
commercially reasonable efforts to comply with the Securities Act and all applicable rules and regulations of the SEC and the Canada Securities Laws and all applicable rules and regulations of any Canada Securities Authority. If the Registration
Filing is made with the SEC, the Company shall make available to its security holders, as soon as reasonably practicable, an earnings statement or such other document that shall satisfy the provisions of Section 11(a) of the Securities Act and
the requirements of Rule 158 thereunder. 
 (j) The Company may require each Registering Shareholder promptly to furnish in
writing to the Company such information regarding the distribution of the Registrable Securities as the Company may from time to time reasonably request and such other information as may be legally required in connection with such registration. 

(k) The Company shall use its commercially reasonable efforts to list all Registrable Securities covered by such Registration
Filing on any securities exchange or quotation system on which any of the Registrable Securities are then listed or traded, or have become listed in connection with the Registration Filing. 

(l) The Company shall have appropriate officers of the Company (i) prepare and make presentations at any “road
shows” and before analysts and rating agencies, as the case may be, (ii) take other actions to obtain ratings for any Registrable Securities and (iii) otherwise use their commercially reasonable efforts to cooperate as reasonably
requested by the underwriters in the offering, marketing or selling of the Registrable Securities. 
 Section 3.6
Indemnification by the Company. (a) The Company agrees to indemnify and hold harmless each Registering Shareholder beneficially owning any Registrable Securities covered by a Demand Registration or Piggyback Registration, each
such Registering Shareholder’s Affiliates and Related Funds and each of such Registering Shareholder’s and its Affiliates’ and Related Funds’ respective partners (whether general, limited or otherwise), shareholders, members,
directors, officers, fiduciaries, managers, members, controlling Persons, employees and agents, and each Person, if any, who controls such Registering Shareholder or its Affiliates and Related Funds within the meaning of Section 15 of the
Securities Act or Section 20 of the Exchange Act from and against any and all Damages caused by, relating to, arising out of or based upon (a) any untrue statement or alleged untrue statement of a material fact, or misrepresentation or
alleged misrepresentation within the meaning of Canada Securities Laws, contained or incorporated by reference in any Registration Filing, Preliminary Prospectus, Prospectus, Shelf Base Prospectus or Shelf Prospectus Supplement, relating to the
Demand Registration or Piggyback Registration, any “issuer free writing prospectus” (as defined in Rule 405 under the Securities Act), any Company information that the Company has filed, or is required to file, pursuant to Rule
433(d) under the Securities Act, any road show as defined in Rule 433(h) under the Securities Act (a “road show”) (including, with respect to any of the foregoing, any 

  
 22 

 
amendments or supplements thereto and all documents incorporated by reference therein), or caused by or relating to any omission or alleged omission to state therein a material fact required to
be stated therein or necessary to make the statements therein not misleading, except insofar as such Damages are caused by or related to any such untrue statement or omission or alleged untrue statement or omission, or misrepresentation or alleged
misrepresentation within the meaning of Canada Securities Laws, so made based upon the Selling Shareholder Information furnished in writing to the Company by such Registering Shareholder or on such Registering Shareholder’s behalf expressly for
use therein, or (b) any non-compliance in connection with such Demand Registration or Piggyback Registration by the Company or a member of the Company Group, or an officer, manager, director, employee or
agent of the Company or a member of the Company Group of the Securities Act, Exchange Act, any Canada Securities Laws, or any applicable rules or regulations of the SEC, FINRA, a Canada Securities Authority or any other applicable securities laws,
rules or regulations. The Company also agrees to indemnify any underwriters for the Demand Registration or Piggyback Registration, their officers and directors and each Person who controls such underwriters within the meaning of Section 15 of
the Securities Act or Section 20 of the Exchange Act on substantially the same basis as that of the indemnification of the Registering Shareholders provided in this Section 3.6. 

Section 3.7 Indemnification by Participating Shareholders. 

(a) Subject to Section 3.7(b), each Registering Shareholder holding Registrable Securities included
in any Registration Filing agrees, severally but not jointly, to indemnify and hold harmless the Company, its officers, directors and agents and each Person, if any, who controls the Company within the meaning of either Section 15 of the
Securities Act or Section 20 of the Exchange Act from and against any and all Damages caused by, relating to or arising out of or based upon any untrue statement or alleged untrue statement of a material fact, or misrepresentation or alleged
misrepresentation within the meaning of Canada Securities Laws, contained in any Registration Filing, Preliminary Prospectus, Prospectus, Shelf Base Prospectus or Shelf Prospectus Supplement, relating to the Demand Registration or Piggyback
Registration, any issuer free writing prospectus, any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act, any road show (including, with respect to any of the foregoing, any
amendments or supplements thereto and all documents incorporated by reference therein), or caused by or relating to any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements
therein not misleading, or misrepresentation or alleged misrepresentation within the meaning of Canada Securities Laws, but only with respect to the Selling Shareholder Information furnished in writing by such Registering Shareholder or on such
Registering Shareholder’s behalf expressly for use in any Registration Filing, Preliminary Prospectus, Prospectus, Shelf Base Prospectus or Shelf Prospectus Supplement relating to the Demand Registration or Piggyback Registration, or any
amendment or supplement thereto. Subject to Section 3.7(b), each such Registering Shareholder also agrees to indemnify and hold harmless underwriters of the Registrable Securities, their officers and directors and each
Person who controls such underwriters within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act on substantially the same basis as that of the indemnification of the Company provided in this
Section 3.7(a). As a condition to including Registrable Securities in any Registration Filing filed in accordance with ARTICLE III, the Company may require that it shall have received an undertaking reasonably
satisfactory to it 

  
 23 

 
from any underwriter to indemnify and hold it harmless to the extent customarily provided by underwriters with respect to similar securities. 

(b) No Shareholder shall be liable under this Section 3.7 for any Damages in excess of the net
proceeds (after deducting discounts and commissions and transfer taxes) actually realized by such Registering Shareholder in the sale of Registrable Securities of such Registering Shareholder to which such Damages relate. 

Section 3.8 Conduct of Indemnification Proceedings. 

(a) If any proceeding (including any governmental investigation) shall be instituted involving any Person in respect of which
indemnity may be sought pursuant to this ARTICLE III, such Person (an “Indemnified Party”) shall promptly notify the Person against whom such indemnity may be sought (the “Indemnifying Party”) in writing and
the Indemnifying Party shall assume the defense thereof, including the employment of counsel reasonably satisfactory to such Indemnified Party, and shall assume the payment of all reasonable and documented fees and expenses; provided that the
failure of any Indemnified Party so to notify the Indemnifying Party shall not relieve the Indemnifying Party of its obligations hereunder except to the extent that the Indemnifying Party is materially prejudiced by such failure to notify. In any
such proceeding, any Indemnified Party shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such Indemnified Party unless (i) the Indemnifying Party and the Indemnified Party shall
have mutually agreed to the retention of such counsel; (ii) the Indemnifying Party has failed within a reasonable time to retain counsel reasonably satisfactory to the Indemnified Party; (iii) the Indemnified Party shall have reasonably
concluded that there may be legal defenses available to it that are different from or in addition to those available to the Indemnifying Party; or (iv) the named parties to any such proceeding (including any impleaded parties) include both the
Indemnifying Party and the Indemnified Party and representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. It is understood that the Indemnifying Party shall not, in
respect of the legal expenses of any Indemnified Party in connection with any proceeding or related proceedings in the same jurisdiction, be liable for the fees and expenses of more than one separate firm (in addition to any local counsel) for all
such Indemnified Parties and that all such fees and expenses shall be reimbursed as they are incurred. In the case of any such separate firm for the Indemnified Parties, such firm shall be nominated in writing by the Indemnified Parties. 

(b) The Indemnifying Party shall not be liable for any settlement of any proceeding effected without its written consent, but
if settled with such consent, or if there be a final judgment for the plaintiff, the Indemnifying Party shall indemnify and hold harmless such Indemnified Parties from and against any loss or liability (to the extent stated above) by reason of such
settlement or judgment. Notwithstanding the foregoing sentence, if at any time an Indemnified Party shall have requested an Indemnifying Party to reimburse the Indemnified Party for fees and expenses of counsel as contemplated by
Section 3.8(a), the Indemnifying Party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by
such Indemnifying Party of the aforesaid request and (ii) such Indemnifying Party shall not have reimbursed the Indemnified Party in accordance with such request prior to the date of such settlement. Without the prior written consent of the
Indemnified Party, no Indemnifying Party shall effect any settlement of any pending 

  
 24 

 
or threatened proceeding in respect of which any Indemnified Party is or could have been a party and indemnity could have been sought hereunder by such Indemnified Party, unless such settlement
(x) includes an unconditional release of such Indemnified Party from all liability arising out of such proceeding and (y) does not include a statement as to or an admission of fault, culpability or a failure to act, by or on behalf of any
Indemnified Party. 
 Section 3.9 Contribution. 

(a) If the indemnification provided for in this ARTICLE III is unavailable to the Indemnified Parties in respect of any
Damages, then each such Indemnifying Party, in lieu of indemnifying such Indemnified Party, shall contribute to the amount paid or payable by such Indemnified Party as a result of such Damages (i) as between the Company and the Registering
Shareholders holding Registrable Securities covered by a Registration Filing on the one hand and the underwriters on the other, in such proportion as is appropriate to reflect the relative benefits received by the Company and such Registering
Shareholders on the one hand and the underwriters on the other, from the offering of the Registrable Securities, or if such allocation is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits
but also the relative fault of the Company and such Registering Shareholders on the one hand and of such underwriters on the other in connection with the statements or omissions that resulted in such Damages, as well as any other relevant equitable
considerations; and (ii) as between the Company on the one hand and each such Registering Shareholder on the other, in such proportion as is appropriate to reflect the relative fault of the Company and of each such Registering Shareholder in
connection with such statements or omissions, as well as any other relevant equitable considerations. The relative benefits received by the Company and such Registering Shareholders on the one hand and such underwriters on the other shall be deemed
to be in the same proportion as the total proceeds from the offering (net of underwriting discounts and commissions but before deducting expenses) received by the Company and such Registering Shareholders bear to the total underwriting discounts and
commissions received by such underwriters. The relative fault of the Company and such Registering Shareholders on the one hand and of such underwriters on the other shall be determined by reference to, among other things, whether the untrue or
alleged untrue statement of a material fact or the omission or alleged omission to state a material fact, or misrepresentation or alleged misrepresentation within the meaning of Canada Securities Laws, relates to information supplied by the Company
and such Registering Shareholders or by such underwriters. The relative fault of the Company on the one hand and of each such Registering Shareholder on the other shall be determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state a material fact, or misrepresentation or alleged misrepresentation within the meaning of Canada Securities Laws, relates to information supplied by such party, and the
parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement, omission or misrepresentation. 

(b) The Company and the Registering Shareholders agree that it would not be just and equitable if contribution pursuant to
this Section 3.9 were determined by pro rata allocation (even if the underwriters were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations
referred to in the immediately preceding paragraph. The amount paid or payable by an Indemnified Party as a result of the Damages referred to in the immediately preceding paragraph shall be deemed to include,

  
 25 

 
subject to the limitations set forth above, any legal or other expenses reasonably incurred by such Indemnified Party in connection with investigating or defending any such action or claim.
Notwithstanding the provisions of this Section 3.9, no underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Registrable Securities underwritten by it and
distributed to the public were offered to the public exceeds the amount of any Damages that such underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission, or
misrepresentation or alleged misrepresentation within the meaning of Canada Securities Laws, and no Registering Shareholder shall be required to contribute any amount in excess of the amount by which the total price at which the Registrable
Securities of such Registering Shareholder were offered to the public (less underwriters’ discounts and commissions and transfer taxes) exceeds the amount of any Damages that such Registering Shareholder has otherwise been required to pay by
reason of such untrue or alleged untrue statement or omission or alleged omission, or such misrepresentation or alleged misrepresentation. No Person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities
Act or under applicable provincial laws of Canada) shall be entitled to contribution from any Person who was not guilty of such fraudulent misrepresentation. 

(c) Each Registering Shareholder’s obligation to contribute pursuant to this Section 3.9 is
several in the proportion that the proceeds of the offering received by such Registering Shareholder bears to the total proceeds of the offering received by all such Registering Shareholders and not joint. Notwithstanding anything to contrary in
this Section 3.9, no Registering Shareholder shall be liable under this Section 3.9 for any Damages in excess of the net proceeds (after deducting discounts, commissions and transfer taxes)
actually realized by such Registering Shareholder in the sale of Registrable Securities of such Registering Shareholder to which such Damages relate. 

Section 3.10 Participation in Public Offering. No Shareholder may participate in any Public Offering hereunder
unless such Shareholder (a) agrees to sell such Shareholder’s Registrable Securities on the basis provided in any underwriting arrangements approved by the Persons entitled hereunder to approve such arrangements and (b) completes and
executes all questionnaires, powers of attorney, indemnities, underwriting agreements and other documents reasonably required under the terms of such underwriting arrangements and the provisions of this Agreement in respect of registration rights.

 Section 3.11 Other Indemnification; Third-Party Beneficiaries. Indemnification similar to that specified
herein (with appropriate modifications) shall be given by the Company and each Shareholder participating therein with respect to any required registration or other qualification of securities under any federal, provincial or state law or regulation
or governmental authority other than the Securities Act and Canada Securities Laws. Each Person indemnified under Section 3.6 or 3.7 is an express third-party beneficiary of Section 3.6 or
3.7, as applicable, and to the extent also applicable, Section 3.8, Section 3.9 and this Section 3.11. 

Section 3.12 Limitations on Subsequent Registration Rights. The Company agrees that it shall not enter into any
agreement with any holder or prospective holder of any securities of the Company (i) that would allow such holder or prospective holder to include such securities in any Demand Registration or Piggyback Registration unless, under the terms of
such agreement, such holder or prospective holder may include such securities in any such registration 

  
 26 

 
only to the extent that their inclusion would not reduce the amount of the Registrable Securities of the Shareholders or (ii) on terms otherwise more favorable than this Agreement unless
Majority Approval is obtained for such other agreement (calculated after excluding any Shares owned by Shareholders (or their Affiliates or Related Funds) who are party to such other agreement). 

Section 3.13 Alternative Registration Rights. In the event that the Company proposes to offer publicly any of its
securities pursuant to the securities laws of a jurisdiction other than the U.S. or Canada, the Shareholders and the Company shall, before such public offering, amend this Agreement to provide the Legato Founders and Key Shareholders with
registration rights, provisions for lock-up agreements, payment of expenses, indemnification and contribution that are substantially equivalent to those provided under this ARTICLE III with any
necessary modifications to reflect differences in securities laws and process for such other jurisdiction and securities exchange. 

Section 3.14 Opt-Out Process. Any Shareholder may at any time by written
notice to the Company opt out of receiving any notices of a Demand Registration, Piggyback Registration or other notice or communication under this ARTICLE III and after delivering such notice, any such Shareholder shall not have the right to
request a Demand Registration or Piggyback Registration, and the Company shall not provide any notices of future Demand Registrations or Piggyback Registrations thereof; provided that such Shareholder shall still be subject to
Section 3.4 (Transfer Restrictions) and any other obligations under this ARTICLE III. Any opted-out Shareholder may at any time provide written notice to the Company or
the Company that it desires to cancel such opt-out at which time such Shareholder will have all the same rights and receive the same notices as any other Shareholder that has not opted out. 

ARTICLE IV 
 CERTAIN
COVENANTS AND AGREEMENTS 
 Section 4.1 Business Opportunities. To the fullest extent permitted by
applicable law and the Organizational Documents of the members of the Company Group, the doctrine of corporate opportunity, or any other analogous doctrine, shall not apply with respect to any member of the Company Group or any Shareholder. Each
Shareholder, its Affiliates and Related Funds and each of such Shareholder’s and its Affiliates’ and Related Funds’ respective partners (whether general, limited or otherwise), shareholders, members, directors, officers, fiduciaries,
managers, members, controlling Persons, employees and agents shall not have any obligation to refrain from (i) engaging in the same or similar activities or lines of business as any member of the Company Group or developing or marketing any
products or services that compete, directly or indirectly, with those of the Company or any of its Subsidiaries, (ii) investing or owning any interest publicly or privately in, or developing a business relationship with, any Person engaged in
the same or similar activities or lines of business as, or otherwise in competition with, any member of the Company Group, (iii) doing business with any client or customer of any member of the Company Group or (iv) employing or otherwise
engaging a former officer or employee of any member of the Company Group. 
 Section 4.2 Tax Matters. The
Company shall: 

  
 27 

 (a) using commercially reasonable efforts, to the extent the Board
determines, based on the advice of U.S. tax advisors, that the Company will be treated as holding an equity interest in a “passive foreign investment company” (within the meaning of Section 1297 of the Code) (a
“PFIC”), provide to the Shareholders such information that is necessary to permit the Shareholders to make an election to treat the PFIC as a “qualified electing fund” under Section 1295 of the Code, and to permit the
Shareholders (or, if applicable, each of its investors which are U.S. taxable investors) to comply with its U.S. federal income tax reporting requirements relating to the PFIC; 

(b) using commercially reasonable efforts, to the extent the Company is treated as holding a direct or indirect equity
interest in a “controlled foreign corporation” (within the meaning of Section 957 of the Code), provide to each Shareholder such information that is necessary to permit the Shareholder to report its pro rata share of Subpart F income
(within the meaning of Section 951 of the Code), “global intangible low-taxed income” (within the meaning of Section 951A of the Code), and/or the amount determined under Section 956
of the Code; and 
 (c) using commercially reasonable efforts, provide to any Shareholder the additional information
reasonably requested by the Shareholder in order to prepare any tax returns required to be filed by the Shareholder reflecting the operations of the Company and its Subsidiaries. 

ARTICLE V 
 MISCELLANEOUS

 Section 5.1 Binding Effect; Assignability; Third-Party Beneficiaries. 

(a) This Agreement shall inure to the benefit of and be binding upon the parties hereto and their respective heirs,
successors, legal representatives and permitted assigns. Any Shareholder that ceases to beneficially own any Company Securities shall cease to be bound by the terms hereof (other than (i) the provisions of Section 3.4
(Transfer Restrictions), 3.6 (Indemnification by the Company), 3.7 (Indemnification by Participating Shareholders), 3.8 (Conduct of Indemnification Proceedings), 3.9 (Contribution) and
3.11 (Other Indemnification; Third-Party Beneficiaries) applicable to such Shareholder with respect to any offering of Registrable Securities completed before the date such Shareholder ceased to own any Company Securities and
(ii) this ARTICLE V) (and the related definitions for each of the foregoing set forth in ARTICLE I). 

(b) Neither this Agreement nor any right, remedy, obligation or liability arising hereunder or by reason hereof shall be
assignable by any party hereto pursuant to any Transfer of Company Securities or otherwise without the prior written consent of the Company, provided that a Shareholder may assign or aggregate its rights and obligations under this Agreement
among its Affiliates and Related Funds without any prior written consent. 
 (c) Nothing in this Agreement, expressed or
implied, is intended to confer on any Person other than the parties hereto, and their respective heirs, successors, legal representatives and permitted assigns, any rights, remedies, obligations or liabilities under or by reason of this Agreement
other than as expressly provided under this Agreement pursuant to 

  
 28 

 
Section 2.7 (Exculpation; Indemnification; D&O Insurance), Section 2.8 (Priority of Indemnification),
Section 3.6 (Indemnification by the Company), 3.7 (Indemnification by Participating Shareholders), 3.8 (Conduct of Indemnification Proceedings), 3.9 (Contribution) and
3.11 (Other Indemnification; Third-Party Beneficiaries). 
 Section 5.2 Notices. All notices,
requests and other communications to any party shall be in writing and shall be delivered in person, mailed by certified or registered mail, return receipt requested, or sent by facsimile transmission or email or other electronic transmission
including email: 
 if to the Company to: 

Algoma Steel Group Inc. 

105 West Street, 

Sault Ste. Marie 

Ontario, Canada P6A 7B4 

Attention: Rajat Marwah, Chief Financial 

Officer Email: rajat.marwah@algoma.com 

and if to a Shareholder, to the address listed for such Shareholder on its signature page hereto or if no such address is
listed, to the address for such Shareholder listed in the Company’s register of shareholders. 
 All notices, requests
and other communications shall be deemed received on the date of receipt by the recipient thereof if received prior to 5:00 p.m. in the place of receipt and such day is a Business Day in the place of receipt. Otherwise, any such notice, request or
communication shall be deemed not to have been received until the next succeeding Business Day in the place of receipt. 

Any Person that becomes a Shareholder shall provide its mailing address, email address and other notice information to the
Company on its signature page hereto. 
 Section 5.3 Waiver; Amendment; Termination; Fallaway. 

(a) Subject to Section 5.3(b), any provision of this Agreement may only be amended, waived or
otherwise modified by an instrument in writing executed by the Company with approval of the Board and with 66 2/3% Approval. In addition, subject to Section 5.3(b), any provision of this Agreement may be waived with respect
to all of the Shareholders by 66 2/3% Approval and any party may waive any provision of this Agreement with respect to itself by an instrument in writing executed by the party against whom the waiver is to be effective. 

(b) Any amendment to ARTICLE II (Corporate Governance) or this Section 5.3 (and the
related definitions for each of the foregoing set forth in ARTICLE I) shall require the prior written consent of each Shareholder with a Nomination Right. Any amendment, waiver or modification of any provision of this Agreement that would
materially and adversely affect the rights, preferences or privileges under this Agreement of any Shareholder in a manner that is disproportionate to the manner in which it affects the rights, preferences or privileges of the

  
 29 

 
Shareholders as a whole may be effected only with the consent of the Shareholder so disproportionately affected. Any amendment, waiver or modification to this
Section 5.3 (and the related definitions set forth in ARTICLE I), or the definition of “Key Shareholder,” may only be amended, waived or otherwise modified by an instrument in writing executed by the
Company with approval of the Board and with the approval of Shareholders with Aggregate Ownership of at least a 75% of the then-outstanding Shares. 

(c) This Agreement may be terminated and be of no further force and effect upon the delivery to the Company of an instrument
in writing signed by the Company and each of the Shareholders with Nomination Rights, and with approval of Shareholders with Aggregate Ownership of at least a 75% of the then-outstanding Shares; provided that
Section 3.4 (Transfer Restrictions) 3.6 (Indemnification by the Company), 3.7 (Indemnification by Participating Shareholders), 3.8 (Conduct of Indemnification Proceedings),
3.9 (Contribution), 3.11 (Other Indemnification; Third-Party Beneficiaries) (and the related definitions for each of the foregoing set forth in ARTICLE I) shall survive such termination. 

Section 5.4 Definition of Legato Founders. The definition of “Legato Founder,” may only be amended,
waived or otherwise modified by an instrument in writing signed by the holders of a majority of the Shares held by the Legato Founders immediately prior to the effectiveness of such amendment, waiver, or modification. 

Section 5.5 Fees and Expenses. Except as otherwise agreed, all costs and expenses incurred in connection with the
preparation of this Agreement and any amendment or waiver of this Agreement, and all of the transactions contemplated hereby shall be paid by the Company. 

Section 5.6 Governing Law. This Agreement and any claim, controversy or dispute arising under or related to this
Agreement shall be governed by, and construed in accordance with, the laws of the State of New York, without regard to the conflicts of laws rules of such state, other than in respect of any matters as to which the application of Canada Law is
mandatory which in such case shall be governed thereby. 
 Section 5.7 Jurisdiction. The parties hereto agree
that any suit, action or proceeding seeking to enforce any provision of, or based on any matter arising out of or in connection with, this Agreement or the transactions contemplated hereby shall be brought in the United States District Court for the
Southern District of New York or, to the extent such court does not have subject matter jurisdiction, any New York State court sitting in New York City, so long as one of such courts shall have subject matter jurisdiction over such suit, action or
proceeding, and that any case of action arising out of this Agreement shall be deemed to have arisen from a transaction of business in the State of New York, and each of the parties hereby irrevocably consents to the jurisdiction of such courts (and
of the appropriate appellate courts therefrom) in any such suit, action or proceeding and irrevocably waives, to the fullest extent permitted by law, any objection that it may now or hereafter have to the laying of the venue of any such suit, action
or proceeding in any such court or that any such suit, action or proceeding which is brought in any such court has been brought in an inconvenient forum. Process in any such suit, action or proceeding may be served on any party anywhere in the
world, whether within or without the jurisdiction of any such court. Without limiting the foregoing, each party agrees that service of 

  
 30 

 
process on such party as provided in Section 5.2 shall be deemed effective service of process on such party. 

Section 5.8 WAIVER OF JURY TRIAL. EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL
BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY. 

Section 5.9 Specific Enforcement. Each party hereto acknowledges that the remedies at law of the other parties for
a breach or threatened breach of this Agreement would be inadequate and, in recognition of this fact, any party to this Agreement, without posting any bond, and in addition to all other remedies that may be available, shall be entitled to obtain
equitable relief in the form of specific performance, a temporary restraining order, a temporary or permanent injunction or any other equitable remedy that may then be available. 

Section 5.10 Counterparts; Effectiveness. This Agreement may be executed in any number of counterparts (including
PDFs), each of which shall be deemed to be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument. This Agreement shall become effective on the Effective Date. 

Section 5.11 Entire Agreement. This Agreement constitutes the entire agreement among the parties hereto with
respect to the subject matter hereof and supersedes all prior and contemporaneous agreements and understandings, both oral and written, among the parties hereto with respect to the subject matter hereof. 

Section 5.12 Termination of Existing Registration Rights. The registration rights granted under this Agreement
shall supersede any registration, qualification or similar rights with respect any shares of securities of the Company or Legato granted under any other agreement, and any of such preexisting registration, qualification or similar rights shall be
terminated and of no further force and effect. 
 Section 5.13 Severability. If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction or other authority to be invalid, void or unenforceable, the remainder of the terms, provisions, covenants and restrictions of this Agreement shall remain in full force and
effect and shall in no way be affected, impaired or invalidated so long as the economic or legal substance of the transactions contemplated hereby is not affected in any manner materially adverse to any party. Upon such a determination, 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 so that the transactions contemplated hereby be consummated as originally contemplated to the
fullest extent possible. 
 Section 5.14 Aggregation of Affiliates and Related Funds. To the extent that any
action, consent or right under this Agreement requires a threshold level of ownership of Shares, Company Securities or Registrable Securities, any Shareholder hereunder may aggregate the ownership of such interests beneficially owned by it or its
Affiliates and Related Funds, as applicable, for the purposes of satisfying such threshold. 

  
 31 

 Section 5.15 Independent Agreement by the Shareholders. The
parties hereto acknowledge that this Agreement does not constitute an agreement, arrangement, or understanding with respect to acting together for the purpose of acquiring, holding, voting, or disposing of the Shares, Company Securities or any
equity securities of the Company or any other member of the Company Group and the Shareholders do not constitute a “group” within the meaning of Rule 13d-5 under the Exchange Act or “joint
actors” under Canada Securities Laws. Nothing contained in this Agreement and no action taken by any Shareholder pursuant to this Agreement shall be deemed to constitute or to create a presumption by any parties that the Shareholders are in any
way acting in concert or as a “group” or “joint actors” (or a joint venture, partnership or association), and the Company and the Shareholders agree to not assert any such claim with respect to such obligations or the
transactions contemplated by this Agreement. 
 Section 5.16 Status as Shareholder. Other than as expressly set
forth herein, no Shareholder, solely by reason of its status as a holder of Company Securities, shall be required to assume or be made responsible for the liabilities of the Company, nor shall be required to make any contribution to the Company.

 [Signature pages follow] 

  
 32 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly
executed as of the date first written above. 
  

	
	 ALGOMA STEEL GROUP INC.

 

	 By:
                                         
                           

	 Name:

	 Title:

 [Signature Page to Investor Rights Agreement] 

 IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first written above. 
  

			
	 SHAREHOLDER2

		
	 By:
	 	  

		 	 Name:

		 	 Title:

  

			
	 Notice Information for Section 7.02

		
	 Address:
	 	  

		
		 	  

		
		 	  

		
	 Email:
	 	  

		
	 Fax No.:
	 	  

  
  

 

	2	 Insert legal name of Investor. If the Investor is signing on behalf of Affiliates and/or Related Funds (as
defined in the Investor Rights Agreement), attach a schedule of those entities. 

  
 [Signature Page to
Investor Rights Agreement]

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