Document:

EX-10.1.2

 Exhibit 10.1.2 

Option No.                  

X4 PHARMACEUTICALS, INC. 

Stock Option Grant Notice 

Stock Option Grant under the Company’s 

2015 Employee, Director and Consultant Equity Incentive Plan 
  

					
	1.	  	Name and Address of Participant:	  	  

			
		  		  	  

			
		  		  	  

			
	2.	  	Date of Option Grant:	  	  

			
	3.	  	Type of Grant:	  	  

			
	4.	  	Maximum Number of Shares for	  	
		  	which this Option is exercisable:	  	  

			
	5.	  	Exercise (purchase) price per share:	  	  

			
	6.	  	Option Expiration Date:	  	  

			
	7.	  	Vesting Start Date1:	  	  

		
	8.	  	Vesting Schedule: This Option shall become exercisable (and the Shares issued upon exercise shall be vested) as follows provided the Participant is an Employee, director or Consultant of the Company or of an Affiliate on
the applicable vesting date:

  

			
	On the first anniversary of the Vesting Start Date (25%)	  	up to                         
Shares2
		
	On the last day of each month following the first anniversary of the Vesting Start Date for 36 consecutive calendar months (2.083%)	  	an additional                      Shares

  
  

	1	 This date is only necessary if a company has decided to trigger vesting from a date that is different from the
date of option grant such as a hire date and is to be used a point of reference for future vesting only. 

	2	 If the agreement does not set forth a vesting schedule as to a specific number of shares and a % is used
instead consider adding the following to the end of the vesting schedule to address the potential vesting of fractional shares: 

“provided that the number of shares vesting on each date shall be rounded down to the nearest whole number, whilst the number of shares
vesting on the final date shall be the remaining unvested balance of the Shares.” 

  
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 [Notwithstanding the foregoing, 100% of the then unvested portion of this Option shall vest
upon the termination of the Participant’s employment by the Company without Cause (as defined in the Plan) upon or at any time within 12 months following a Change of Control. The Participant’s employment shall be considered to have been
terminated by the Company for Cause if the Company determines, within 30 days after the Participant’s resignation, that termination for Cause was warranted.

For purposes of this Option, a “Change of Control” shall mean the occurrence of any of the following events: any “Person”
(as such term is used in Sections 13(d) and 14(d) of the Exchange Act) becomes the “Beneficial Owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of securities of the Company representing fifty percent (50%)
or more of the total voting power represented by the Company’s then outstanding voting securities (excluding for this purpose any such voting securities held by the Company, or any affiliate, parent or subsidiary of the Company, or by any
employee benefit plan of the Company) pursuant to a transaction or a series of related transactions which the Board of Directors does not approve; or (ii) (A) A merger or consolidation of the Company whether or not approved by the Board of
Directors, other than a merger or consolidation which would result in the voting securities of the Company outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being converted into voting securities of
the surviving entity or the parent of such corporation) at least fifty percent (50%) of the total voting power represented by the voting securities of the Company or such surviving entity or parent of such corporation, as the case may be,
outstanding immediately after such merger or consolidation; or (B) the sale or disposition by the Company of all or substantially all of the Company’s assets.] 

The foregoing rights are cumulative and are subject to the other terms and conditions of this Agreement and the Plan. 

The Company and the Participant acknowledge receipt of this Stock Option Grant Notice and agree to the terms of the Stock Option Agreement
attached hereto and incorporated by reference herein, the Company’s 2015 Employee, Director and Consultant Equity Incentive Plan and the terms of this Option Grant as set forth above. 

 

			
	X4 PHARMACEUTICALS, INC.

 
			
		
	By:	 	  

 
			
	Name:	 	  

 
			
	Title:	 	  

 
			
	
	  

Participant

  
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 X4 PHARMACEUTICALS, INC. 

STOCK OPTION AGREEMENT - INCORPORATED TERMS AND CONDITIONS 

AGREEMENT made as of the date of grant set forth in the Stock Option Grant Notice by and between X4 Pharmaceuticals, Inc. (the
“Company”), a Delaware corporation, and the individual whose name appears on the Stock Option Grant Notice (the “Participant”). 

WHEREAS, the Company desires to grant to the Participant an Option to purchase shares of its common stock, $0.001 par value per share (the
“Shares”), under and for the purposes set forth in the Company’s 2015 Employee, Director and Consultant Equity Incentive Plan (the “Plan”); 

WHEREAS, the Company and the Participant understand and agree that any terms used and not defined herein have the same meanings as in the
Plan; and 
 WHEREAS, the Company and the Participant each intend that the Option granted herein shall be of the type set forth in the Stock
Option Grant Notice. 
 NOW, THEREFORE, in consideration of the mutual covenants hereinafter set forth and for other good and valuable
consideration, the parties hereto agree as follows: 
  

	 	1.	 GRANT OF OPTION. 

The Company hereby grants to the Participant the right and option to purchase all or any part of an aggregate of the number of Shares set forth
in the Stock Option Grant Notice, on the terms and conditions and subject to all the limitations set forth herein, under United States securities and tax laws, and in the Plan, which is incorporated herein by reference. The Participant acknowledges
receipt of a copy of the Plan. 
  

	 	2.	 EXERCISE PRICE. 

The exercise price of the Shares covered by the Option shall be the amount per Share set forth in the Stock Option Grant Notice, subject to
adjustment, as provided in the Plan, in the event of a stock split, reverse stock split or other events affecting the holders of Shares after the date hereof (the “Exercise Price”). Payment shall be made in accordance with Paragraph 9 of
the Plan. 
  

	 	3.	 EXERCISABILITY OF OPTION. 

Subject to the terms and conditions set forth in this Agreement and the Plan, the Option granted hereby shall become vested and exercisable as
set forth in the Stock Option Grant Notice and is subject to the other terms and conditions of this Agreement and the Plan. 
  

	 	4.	 TERM OF OPTION. 

This Option shall terminate on the Option Expiration Date as specified in the Stock Option Grant Notice and, if this Option is designated in
the Stock Option Grant Notice as an ISO and the Participant owns as of the date hereof more than 10% of the total combined voting power of all classes of capital stock of the Company or an Affiliate, such date may not be more than five years from
the date of this Agreement, but shall be subject to earlier termination as provided herein or in the Plan. 

  
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 If the Participant ceases to be an Employee, director or Consultant of the Company or of an
Affiliate for any reason other than the death or Disability of the Participant, or termination of the Participant for Cause (the “Termination Date”), the Option to the extent then vested and exercisable pursuant to Section 3 hereof as
of the Termination Date, and not previously terminated in accordance with this Agreement, may be exercised within three months after the Termination Date, or on or prior to the Option Expiration Date as specified in the Stock Option Grant Notice,
whichever is earlier, but may not be exercised thereafter except as set forth below. In such event, the unvested portion of the Option shall not be exercisable and shall expire and be cancelled on the Termination Date. 

If this Option is designated in the Stock Option Grant Notice as an ISO and the Participant ceases to be an Employee of the Company or of an
Affiliate but continues after termination of employment to provide service to the Company or an Affiliate as a director or Consultant, this Option shall continue to vest in accordance with Section 3 above as if this Option had not terminated
until the Participant is no longer providing services to the Company. In such case, this Option shall automatically convert and be deemed a Non-Qualified Option as of the date that is three months from termination of the Participant’s
employment and this Option shall continue on the same terms and conditions set forth herein until such Participant is no longer providing service to the Company or an Affiliate. 

Notwithstanding the foregoing, in the event of the Participant’s Disability or death within three months after the Termination Date, the
Participant or the Participant’s Survivors may exercise the Option within one year after the Termination Date, but in no event after the Option Expiration Date as specified in the Stock Option Grant Notice. 

In the event the Participant’s service is terminated by the Company or an Affiliate for Cause, the Participant’s right to exercise
any unexercised portion of this Option even if vested shall cease immediately as of the time the Participant is notified his or her service is terminated for Cause, and this Option shall thereupon terminate. Notwithstanding anything herein to the
contrary, if subsequent to the Participant’s termination, but prior to the exercise of the Option, the Administrator determines that, either prior or subsequent to the Participant’s termination, the Participant engaged in conduct which
would constitute Cause, then the Participant shall immediately cease to have any right to exercise the Option and this Option shall thereupon terminate. 

In the event of the Disability of the Participant, as determined in accordance with the Plan, the Option shall be exercisable within one year
after the Participant’s termination of service due to Disability or, if earlier, on or prior to the Option Expiration Date as specified in the Stock Option Grant Notice. In such event, the Option shall be exercisable: 

 

	 	(a)	 to the extent that the Option has become exercisable but has not been exercised as of the date of the
Participant’s termination of service due to Disability; and 

  
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	 	(b)	 in the event rights to exercise the Option accrue periodically, to the extent of a pro rata portion through the
date of the Participant’s termination of service due to Disability of any additional vesting rights that would have accrued on the next vesting date had the Participant not become Disabled. The proration shall be based upon the number of days
accrued in the current vesting period prior to the date of the Participant’s termination of service due to Disability. 

In the event of the death of the Participant while an Employee, director or Consultant of the Company or of an Affiliate, the Option shall be
exercisable by the Participant’s Survivors within one year after the date of death of the Participant or, if earlier, on or prior to the Option Expiration Date as specified in the Stock Option Grant Notice. In such event, the Option shall be
exercisable: 
  

	 	(x)	 to the extent that the Option has become exercisable but has not been exercised as of the date of death; and

  

	 	(y)	 in the event rights to exercise the Option accrue periodically, to the extent of a pro rata portion through the
date of death of any additional vesting rights that would have accrued on the next vesting date had the Participant not died. The proration shall be based upon the number of days accrued in the current vesting period prior to the Participant’s
date of death. 

  

	 	5.	 METHOD OF EXERCISING OPTION. 

Subject to the terms and conditions of this Agreement, the Option may be exercised by written notice to the Company or its designee, in
substantially the form of Exhibit A attached hereto (or in such other form acceptable to the Company, which may include electronic notice). Such notice shall state the number of Shares with respect to which the Option is being exercised and
shall be signed by the person exercising the Option (which signature may be provided electronically in a form acceptable to the Company). Payment of the Exercise Price for such Shares shall be made in accordance with Paragraph 9 of the Plan. The
Company shall deliver such Shares as soon as practicable after the notice shall be received, provided, however, that the Company may delay issuance of such Shares until completion of any action or obtaining of any consent, which the Company deems
necessary under any applicable law (including, without limitation, state securities or “blue sky” laws). The Shares as to which the Option shall have been so exercised shall be registered in the Company’s share register in the name of
the person so exercising the Option (or, if the Option shall be exercised by the Participant and if the Participant shall so request in the notice exercising the Option, shall be registered in the Company’s share register in the name of the
Participant and another person jointly, with right of survivorship) and shall be delivered as provided above to or upon the written order of the person exercising the Option. In the event the Option shall be exercised, pursuant to Section 4
hereof, by any person other than the Participant, such notice shall be accompanied by appropriate proof of the right of such person to exercise the Option. All Shares that shall be purchased upon the exercise of the Option as provided herein shall
be fully paid and nonassessable. 

  
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	 	6.	 PARTIAL EXERCISE. 

Exercise of this Option to the extent above stated may be made in part at any time and from time to time within the above limits, except that
no fractional share shall be issued pursuant to this Option. 
  

	 	7.	 NON-ASSIGNABILITY. 

The Option shall not be transferable by the Participant otherwise than by will or by the laws of descent and distribution. If this Option is a
Non-Qualified Option then it may also be transferred pursuant to a qualified domestic relations order as defined by the Code or Title I of the Employee Retirement Income Security Act or the rules thereunder. Except as provided above in this
paragraph, the Option shall be exercisable, during the Participant’s lifetime, only by the Participant (or, in the event of legal incapacity or incompetency, by the Participant’s guardian or representative) and shall not be assigned,
pledged or hypothecated in any way (whether by operation of law or otherwise) and shall not be subject to execution, attachment or similar process. Any attempted transfer, assignment, pledge, hypothecation or other disposition of the Option or of
any rights granted hereunder contrary to the provisions of this Section 7, or the levy of any attachment or similar process upon the Option shall be null and void. 
  

	 	8.	 NO RIGHTS AS STOCKHOLDER UNTIL EXERCISE. 

The Participant shall have no rights as a stockholder with respect to Shares subject to this Agreement until registration of the Shares in the
Company’s share register in the name of the Participant. Except as is expressly provided in the Plan with respect to certain changes in the capitalization of the Company, no adjustment shall be made for dividends or similar rights for which the
record date is prior to the date of such registration. 
  

	 	9.	 ADJUSTMENTS. 

The Plan contains provisions covering the treatment of Options in a number of contingencies such as stock splits and mergers. Provisions in the
Plan for adjustment with respect to stock subject to Options and the related provisions with respect to successors to the business of the Company are hereby made applicable hereunder and are incorporated herein by reference. 

 

	 	10.	 TAXES. 

The Participant acknowledges and agrees that (i) any income or other taxes due from the Participant with respect to this Option or the
Shares issuable upon exercise of this Option shall be the Participant’s responsibility; (ii) the Participant was free to use professional advisors of his or her choice in connection with this Agreement, has received advice from his or her
professional advisors in connection with this Agreement, understands its meaning and import, and is entering into this Agreement freely and without coercion or duress; (iii) the Participant has not received and is not relying upon any advice,
representations or assurances made by or on behalf of the Company or any Affiliate or any employee of or counsel to the Company or any Affiliate regarding any tax or other effects or implications of the Option, the Shares or other matters
contemplated by this Agreement and (iv) neither the Administrator, the Company, its Affiliates, nor any of its officers or directors, shall be held liable for any applicable costs, taxes, or penalties associated with the Option if, in fact, the
Internal Revenue Service were to determine that the Option constitutes deferred compensation under Section 409A of the Code. 

  
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 If this Option is designated in the Stock Option Grant Notice as a Non-Qualified Option or
if the Option is converted into a Non-Qualified Option and such Non-Qualified Option is exercised, the Participant agrees that the Company may withhold from the Participant’s remuneration, if any, the minimum statutory amount of federal, state
and local withholding taxes attributable to such amount that is considered compensation includable in such person’s gross income. At the Company’s discretion, the amount required to be withheld may be withheld in cash from such
remuneration, or in kind from the Shares otherwise deliverable to the Participant on exercise of the Option. The Participant further agrees that, if the Company does not withhold an amount from the Participant’s remuneration sufficient to
satisfy the Company’s income tax withholding obligation, the Participant will reimburse the Company on demand, in cash, for the amount under-withheld. 
  

	 	11.	 PURCHASE FOR INVESTMENT. 

Unless the offering and sale of the Shares to be issued upon the particular exercise of the Option shall have been effectively registered under
the Securities Act of 1933, as now in force or hereafter amended (the “1933 Act”), the Company shall be under no obligation to issue the Shares covered by such exercise unless the Company has determined that such exercise and issuance
would be exempt from the registration requirements of the 1933 Act and until the following conditions have been fulfilled: 
  

	 	(a)	 The person(s) who exercise the Option shall warrant to the Company, at the time of such exercise, that such
person(s) are acquiring such Shares for their own respective accounts, for investment, and not with a view to, or for sale in connection with, the distribution of any such Shares, in which event the person(s) acquiring such Shares shall be bound by
the provisions of the following legend which shall be endorsed upon any certificate(s) evidencing the Shares issued pursuant to such exercise: 

“The shares represented by this certificate have been taken for investment and they may not be sold or otherwise transferred by any
person, including a pledgee, unless (1) either (a) a Registration Statement with respect to such shares shall be effective under the Securities Act of 1933, as amended, or (b) the Company shall have received an opinion of counsel
satisfactory to it that an exemption from registration under such Act is then available, and (2) there shall have been compliance with all applicable state securities laws;” and 

 

	 	(b)	 If the Company so requires, the Company shall have received an opinion of its counsel that the Shares may be
issued upon such particular exercise in compliance with the 1933 Act without registration thereunder. Without limiting the generality of the foregoing, the Company may delay issuance of the Shares until completion of any action or obtaining of any
consent, which the Company deems necessary under any applicable law (including without limitation state securities or “blue sky” laws). 

  
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	 	12.	 RESTRICTIONS ON TRANSFER OF SHARES. 

12.1 The Shares acquired by the Participant pursuant to the exercise of the Option granted hereby shall not be transferred by the Participant
except as permitted herein. 
 12.2 In the event of the Participant’s termination of service for any reason, the Company shall have the
option, but not the obligation, to repurchase all or any part of the Shares issued pursuant to this Agreement (including, without limitation, Shares purchased after termination of service, Disability or death in accordance with Section 4
hereof). In the event the Company does not, upon the termination of service of the Participant (as described above), exercise its option pursuant to this Section 12.2, the restrictions set forth in the balance of this Agreement shall not
thereby lapse, and the Participant for himself or herself, his or her heirs, legatees, executors, administrators and other successors in interest, agrees that the Shares shall remain subject to such restrictions. The following provisions shall apply
to a repurchase under this Section 12.2: 
  

	 	(i)	 The per share repurchase price of the Shares to be sold to the Company upon exercise of its option under this
Section 12.2 shall be equal to the Fair Market Value of each such Share determined in accordance with the Plan as of the date of repurchase provided, however, in the event of a termination by the Company for Cause, the per share repurchase
price of the Shares to be sold to the Company upon exercise of its option under this Section 12.2 shall be equal to the lesser of the Exercise Price and the Fair Market Value on the date of the repurchase. 

 

	 	(ii)	 The Company’s option to repurchase the Participant’s Shares in the event of termination of service
shall be valid for a period of 12 months commencing with the date of such termination of service. 

  

	 	(iii)	 In the event the Company shall be entitled to and shall elect to exercise its option to repurchase the
Participant’s Shares under this Section 12.2, the Company shall notify the Participant, or in case of death, his or her Survivor, in writing of its intent to repurchase the Shares. Such written notice may be mailed by the Company up to and
including the last day of the time period provided for in Section 12.2(ii) for exercise of the Company’s option to repurchase. 

  

	 	(iv)	 The written notice to the Participant shall specify the address at, and the time and date on, which payment of
the repurchase price is to be made (the “Closing”). The date specified shall not be less than ten days nor more than 60 days from the date of the mailing of the notice, and the Participant or his or her successor in interest with respect
to the Shares shall have no further rights as the owner thereof from and after the date specified in the notice. At the Closing, the repurchase price shall be delivered to the Participant or his or her successor in interest and the Shares being
purchased, duly endorsed for transfer, shall, to the extent that they are not then in the possession of the Company, be delivered to the Company by the Participant or his or her successor in interest. 

  
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 12.3 It shall be a condition precedent to the validity of any sale or other transfer of any
Shares by the Participant that the following restrictions be complied with (except as otherwise provided in this Section 12): 
  

	 	(i)	 No Shares owned by the Participant may be sold, pledged or otherwise transferred (including by gift or devise)
to any person or entity, voluntarily, or by operation of law, except in accordance with the terms and conditions hereinafter set forth. 

  

	 	(ii)	 Before selling or otherwise transferring all or part of the Shares, the Participant shall give written notice
of such intention to the Company, which notice shall include the name of the proposed transferee, the proposed purchase price per share, the terms of payment of such purchase price and all other matters relating to such sale or transfer and shall be
accompanied by a copy of the binding written agreement of the proposed transferee to purchase the Shares of the Participant. Such notice shall constitute a binding offer by the Participant to sell to the Company such number of the Shares then held
by the Participant as are proposed to be sold in the notice at the monetary price per share designated in such notice, payable on the terms offered to the Participant by the proposed transferee (provided, however, that the Company shall not be
required to meet any non-monetary terms of the proposed transfer, including, without limitation, delivery of other securities in exchange for the Shares proposed to be sold). The Company shall give written notice to the Participant as to whether
such offer has been accepted in whole by the Company within 60 days after its receipt of written notice from the Participant. The Company may only accept such offer in whole and may not accept such offer in part. Such acceptance notice shall fix a
time, location and date for the Closing on such purchase (“Closing Date”) which shall not be less than ten nor more than sixty days after the giving of the acceptance notice, provided, however, if any of the Shares to be sold pursuant to
this Section 12.3 have been held by the Participant for less than six months, then the Closing Date may be extended by the Company until no more than ten days after such Shares have been held by the Participant for six months if required under
applicable accounting rules in effect at the time. The place for such Closing shall be at the Company’s principal office. At such Closing, the Participant shall accept payment as set forth herein and shall deliver to the Company in exchange
therefor certificates for the number of Shares stated in the notice accompanied by duly executed instruments of transfer. 

  

	 	(iii)	 If the Company shall fail to accept any such offer, the Participant shall be free to sell all, but not less
than all, of the Shares set forth in his or her notice to the designated transferee at the price and terms designated in the Participant’s notice, provided that (i) such sale is consummated within six months after the giving of notice by
the Participant to the Company as aforesaid, and (ii) the transferee first agrees in writing to be bound by the provisions of this Section 12 so that such transferee (and all subsequent transferees) shall thereafter only be permitted to
sell or transfer the Shares in accordance with the terms hereof. After the expiration of such six months, the provisions of this Section 12.3 shall again apply with respect to any proposed voluntary transfer of the Participant’s Shares.

  
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	 	(iv)	 The provisions of this Section 12.3 may be waived by the Company. Any such waiver may be unconditional or
based upon such conditions as the Company may impose. 

 12.4 In the event that the Participant or his or her successor in
interest fails to deliver the Shares to be repurchased by the Company under this Agreement, the Company may elect (a) to establish a segregated account in the amount of the repurchase price, such account to be turned over to the Participant or
his or her successor in interest upon delivery of such Shares, and (b) immediately to take such action as is appropriate to transfer record title of such Shares from the Participant to the Company and to treat the Participant and such Shares in
all respects as if delivery of such Shares had been made as required by this Agreement. The Participant hereby irrevocably grants the Company a power of attorney which shall be coupled with an interest for the purpose of effectuating the preceding
sentence. 
 12.5 If the Company shall pay a stock dividend or declare a stock split on or with respect to any of its Common Stock, or
otherwise distribute securities of the Company to the holders of its Common Stock, the number of shares of stock or other securities of the Company issued with respect to the shares then subject to the restrictions contained in this Agreement shall
be added to the Shares subject to the Company’s rights to repurchase pursuant to this Agreement. If the Company shall distribute to its stockholders shares of stock of another corporation, the shares of stock of such other corporation,
distributed with respect to the Shares then subject to the restrictions contained in this Agreement, shall be added to the Shares subject to the Company’s rights to repurchase pursuant to this Agreement. 

12.6 If the outstanding shares of Common Stock of the Company shall be subdivided into a greater number of shares or combined into a smaller
number of shares, or in the event of a reclassification of the outstanding shares of Common Stock of the Company, or if the Company shall be a party to a merger, consolidation or capital reorganization, there shall be substituted for the Shares then
subject to the restrictions contained in this Agreement such amount and kind of securities as are issued in such subdivision, combination, reclassification, merger, consolidation or capital reorganization in respect of the Shares subject immediately
prior thereto to the Company’s rights to repurchase pursuant to this Agreement. 
 12.7 The Company shall not be required to transfer
any Shares on its books which shall have been sold, assigned or otherwise transferred in violation of this Agreement, or to treat as owner of such Shares, or to accord the right to vote as such owner or to pay dividends to, any person or
organization to which any such Shares shall have been so sold, assigned or otherwise transferred, in violation of this Agreement. 
 12.8
The provisions of Sections 12.1, 12.2 and 12.3 shall terminate upon the effective date of the registration of the Shares pursuant to the Securities Exchange Act of 1934. 

  
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 12.9 The Participant agrees that in the event the Company proposes to offer for sale to the
public any of its equity securities and such Participant is requested by the Company and any underwriter engaged by the Company in connection with such offering to sign an agreement restricting the sale or other transfer of Shares, then it will
promptly sign such agreement and will not transfer, whether in privately negotiated transactions or to the public in open market transactions or otherwise, any Shares or other securities of the Company held by him or her during such period as is
determined by the Company and the underwriters, not to exceed 180 days following the closing of the offering, plus such additional period of time as may be required to comply with NASD Rule 2711 or similar rules thereto (such period, the
“Lock-Up Period”). Such agreement shall be in writing and in form and substance reasonably satisfactory to the Company and such underwriter and pursuant to customary and prevailing terms and conditions. Notwithstanding whether the
Participant has signed such an agreement, the Company may impose stop-transfer instructions with respect to the Shares or other securities of the Company subject to the foregoing restrictions until the end of the Lock-Up Period. 

12.10 The Participant acknowledges and agrees that neither the Company, its shareholders nor its directors and officers, has any duty or
obligation to disclose to the Participant any material information regarding the business of the Company or affecting the value of the Shares before, at the time of, or following a termination of the service of the Participant by the Company,
including, without limitation, any information concerning plans for the Company to make a public offering of its securities or to be acquired by or merged with or into another firm or entity. 

12.11 All certificates representing the Shares to be issued to the Participant pursuant to this Agreement shall have endorsed thereon a legend
substantially as follows: “The shares represented by this certificate are subject to restrictions set forth in a Stock Option Agreement dated ____________, 201__ with this Company, a copy of which Agreement is available for inspection at the
offices of the Company or will be made available upon request.” 
  

	 	13.	 NO OBLIGATION TO MAINTAIN RELATIONSHIP. 

The Participant acknowledges that: (i) the Company is not by the Plan or this Option obligated to continue the Participant as an employee,
director or Consultant of the Company or an Affiliate; (ii) the Plan is discretionary in nature and may be suspended or terminated by the Company at any time; (iii) the grant of the Option is a one-time benefit which does not create any
contractual or other right to receive future grants of options, or benefits in lieu of options; (iv) all determinations with respect to any such future grants, including, but not limited to, the times when options shall be granted, the number
of shares subject to each option, the option price, and the time or times when each option shall be exercisable, will be at the sole discretion of the Company; (v) the Participant’s participation in the Plan is voluntary; (vi) the
value of the Option is an extraordinary item of compensation which is outside the scope of the Participant’s employment or consulting contract, if any; and (vii) the Option is not part of normal or expected compensation for purposes of
calculating any severance, resignation, redundancy, end of service payments, bonuses, long-service awards, pension or retirement benefits or similar payments. 

  
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	 	14.	 IF OPTION IS INTENDED TO BE AN ISO. 

If this Option is designated in the Stock Option Grant Notice as an ISO so that the Participant (or the Participant’s Survivors) may
qualify for the favorable tax treatment provided to holders of Options that meet the standards of Section 422 of the Code then any provision of this Agreement or the Plan which conflicts with the Code so that this Option would not be deemed an
ISO is null and void and any ambiguities shall be resolved so that the Option qualifies as an ISO. The Participant should consult with the Participant’s own tax advisors regarding the tax effects of the Option and the requirements necessary to
obtain favorable tax treatment under Section 422 of the Code, including, but not limited to, holding period requirements. 

Notwithstanding the foregoing, to the extent that the Option is designated in the Stock Option Grant Notice as an ISO and is not deemed to be
an ISO pursuant to Section 422(d) of the Code because the aggregate Fair Market Value (determined as of the Date of Option Grant) of any of the Shares with respect to which this ISO is granted becomes exercisable for the first time during any
calendar year in excess of $100,000, the portion of the Option representing such excess value shall be treated as a Non-Qualified Option and the Participant shall be deemed to have taxable income measured by the difference between the then Fair
Market Value of the Shares received upon exercise and the price paid for such Shares pursuant to this Agreement. 
 Neither the Company nor
any Affiliate shall have any liability to the Participant, or any other party, if the Option (or any part thereof) that is intended to be an ISO is not an ISO or for any action taken by the Administrator, including without limitation the conversion
of an ISO to a Non-Qualified Option. 
  

	 	15.	 NOTICE TO COMPANY OF DISQUALIFYING DISPOSITION OF AN ISO. 

If this Option is designated in the Stock Option Grant Notice as an ISO then the Participant agrees to notify the Company in writing
immediately after the Participant makes a Disqualifying Disposition of any of the Shares acquired pursuant to the exercise of the ISO. A Disqualifying Disposition is defined in Section 424(c) of the Code and includes any disposition (including
any sale) of such Shares before the later of (a) two years after the date the Participant was granted the ISO or (b) one year after the date the Participant acquired Shares by exercising the ISO, except as otherwise provided in
Section 424(c) of the Code. If the Participant has died before the Shares are sold, these holding period requirements do not apply and no Disqualifying Disposition can occur thereafter. 

 

	 	16.	 NOTICES. 

Any notices required or permitted by the terms of this Agreement or the Plan shall be given by recognized courier service, facsimile,
registered or certified mail, return receipt requested, addressed as follows: 
 If to the Company: 

X4 Pharmaceuticals, Inc. 
 One
Broadway, 14th Floor 
 Cambridge, MA 02142 

Attention: President 

  
 12 

 If to the Participant at the address set forth on the Stock Option Grant Notice or to such other address or
addresses of which notice in the same manner has previously been given. Any such notice shall be deemed to have been given upon the earlier of receipt, one business day following delivery to a recognized courier service or three business days
following mailing by registered or certified mail. 
  

	 	17.	 GOVERNING LAW. 

This Agreement shall be governed by and construed in accordance with the laws of the State of Delaware, without giving effect to the conflict
of law principles thereof. For the purpose of litigating any dispute that arises under this Agreement, the parties hereby consent to exclusive jurisdiction in Massachusetts and agree that such litigation shall be conducted in the state courts of
Middlesex County, Massachusetts or the federal courts of the United States for the District of Massachusetts. 
  

	 	18.	 BENEFIT OF AGREEMENT. 

Subject to the provisions of the Plan and the other provisions hereof, this Agreement shall be for the benefit of and shall be binding upon the
heirs, executors, administrators, successors and assigns of the parties hereto. 
  

	 	19.	 ENTIRE AGREEMENT. 

This Agreement, together with the Plan, embodies the entire agreement and understanding between the parties hereto with respect to the subject
matter hereof and supersedes all prior oral or written agreements and understandings relating to the subject matter hereof. No statement, representation, warranty, covenant or agreement not expressly set forth in this Agreement shall affect or be
used to interpret, change or restrict, the express terms and provisions of this Agreement, provided, however, in any event, this Agreement shall be subject to and governed by the Plan. 

 

	 	20.	 MODIFICATIONS AND AMENDMENTS. 

The terms and provisions of this Agreement may be modified or amended as provided in the Plan. 

 

	 	21.	 WAIVERS AND CONSENTS. 

Except as provided in the Plan, the terms and provisions of this Agreement may be waived, or consent for the departure therefrom granted, only
by written document executed by the party entitled to the benefits of such terms or provisions. No such waiver or consent shall be deemed to be or shall constitute a waiver or consent with respect to any other terms or provisions of this Agreement,
whether or not similar. Each such waiver or consent shall be effective only in the specific instance and for the purpose for which it was given, and shall not constitute a continuing waiver or consent. 

  
 13 

	 	22.	 DATA PRIVACY. 

By entering into this Agreement, the Participant: (i) authorizes the Company and each Affiliate, and any agent of the Company or any
Affiliate administering the Plan or providing Plan recordkeeping services, to disclose to the Company or any of its Affiliates such information and data as the Company or any such Affiliate shall request in order to facilitate the grant of options
and the administration of the Plan; (ii) waives any data privacy rights he or she may have with respect to such information; and (iii) authorizes the Company and each Affiliate to store and transmit such information in electronic form.

 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK] 

  
 14 

 Exhibit A 

NOTICE OF EXERCISE OF STOCK OPTION 

[Form for Unregistered Shares] 
 To:
X4 Pharmaceuticals, Inc. 
 Ladies and Gentlemen: 

I hereby exercise my Stock Option to purchase ______ shares (the “Shares”) of the common stock, $0.001 par value, of X4
Pharmaceuticals, Inc. (the “Company”), at the exercise price of $_____ per share, pursuant to and subject to the terms of that certain Stock Option Agreement between the undersigned and the Company dated _________, 201_. 

I am aware that the Shares have not been registered under the Securities Act of 1933, as amended (the “1933 Act”), or any state
securities laws. I understand that the reliance by the Company on exemptions under the 1933 Act is predicated in part upon the truth and accuracy of the statements by me in this Notice of Exercise. 

I hereby represent and warrant that (1) I have been furnished with all information which I deem necessary to evaluate the merits and
risks of the purchase of the Shares; (2) I have had the opportunity to ask questions concerning the Shares and the Company and all questions posed have been answered to my satisfaction; (3) I have been given the opportunity to obtain any
additional information I deem necessary to verify the accuracy of any information obtained concerning the Shares and the Company; and (4) I have such knowledge and experience in financial and business matters that I am able to evaluate the
merits and risks of purchasing the Shares and to make an informed investment decision relating thereto. 
 I hereby represent and warrant
that I am purchasing the Shares for my own personal account for investment and not with a view to the sale or distribution of all or any part of the Shares. 

I understand that because the Shares have not been registered under the 1933 Act, I must continue to bear the economic risk of the investment
for an indefinite time and the Shares cannot be sold unless the Shares are subsequently registered under applicable federal and state securities laws or an exemption from such registration requirements is available. 

I agree that I will in no event sell or distribute or otherwise dispose of all or any part of the Shares unless (1) there is an effective
registration statement under the 1933 Act and applicable state securities laws covering any such transaction involving the Shares or (2) the Company receives an opinion of my legal counsel (concurred in by legal counsel for the Company) stating
that such transaction is exempt from registration or the Company otherwise satisfies itself that such transaction is exempt from registration. 

  
 15 

 I consent to the placing of a legend on my certificate for the Shares stating that the
Shares have not been registered and setting forth the restriction on transfer contemplated hereby and to the placing of a stop transfer order on the books of the Company and with any transfer agents against the Shares until the Shares may be legally
resold or distributed without restriction. 
 I understand that at the present time Rule 144 of the Securities and Exchange Commission (the
“SEC”) may not be relied on for the resale or distribution of the Shares by me. I understand that the Company has no obligation to me to register the sale of the Shares with the SEC and has not represented to me that it will register the
sale of the Shares. 
 I understand the terms and restrictions on the right to dispose of the Shares set forth in the 2015 Employee,
Director and Consultant Equity Incentive Plan and the Stock Option Agreement, both of which I have carefully reviewed. I consent to the placing of a legend on my certificate for the Shares referring to such restriction and the placing of stop
transfer orders until the Shares may be transferred in accordance with the terms of such restrictions. 
 I have considered the Federal,
state and local income tax implications of the exercise of my Option and the purchase and subsequent sale of the Shares. 
 I am paying the
option exercise price for the Shares as follows: 
  

                       
                                         
                     
 Please issue
the Shares (check one): 
 ☐ to me; or 

☐ to me and
                                 , as joint tenants with right of survivorship

 and mail the certificate to me at the following address: 
  

                          
                                         
  
  

                          
                                         
  
  

                          
                                         
  
 My mailing address for shareholder communications, if different from the address listed above is: 

 

                          
                                         
  
  

                          
                                         
  
  

                          
                                         
  

  
 16 

 
	
	Very truly yours,
	
	Participant (signature)
	
	Print Name
	
	Date
	
	Social Security Number

  
 17Exhibit 10.1

 

DEED OF AMENDMENT

 

Dated: 28 March 2019

By and Among:

 

		(1)	Citibank Europe plc (the “Bank”);

 

		(2)	AXIS Specialty Limited (“ASL”);

 

		(3)	AXIS Re SE (formerly, AXIS Re Limited);

 

		(4)

                                                                       
	AXIS Specialty Europe SE (formerly, AXIS Specialty Europe
Limited);

 

		(5)	AXIS Insurance Company;

 

		(6)	AXIS Surplus Insurance Company; and

 

		(7)	AXIS Reinsurance Company

 

(parties
(2), (3), (4), (5), (6) and (7) together known as the “Companies”).

 

		Re:	Committed Facility Letter - Facility Number 2

 

1. Background

 

		1.1	On 27 March 2017 a Committed Facility Letter– Facility Number 2 was entered into by and among
the Bank and the Companies, as amended on 28 March 2018 (the “Committed Facility Letter”).

 

		1.2	The Parties have agreed to certain further amendments to the Committed Facility Letter as detailed
in this Deed.

 

		1.3	The terms and expressions defined in the Committed Facility Letter shall have the same meanings
when used in this Deed unless otherwise indicated.

 

		1.4	The parties to this Deed hereby agree that from the Effective Date (as defined below) the rights
and obligations of the parties under the Committed Facility Letter and the terms of the Committed Facility Letter shall be amended
as set out below.

 

2. Effective Date

 

The following amendments
shall take effect on and from 31 March 2019 (“Effective Date”).

 

3. Amendments

 

With effect from the Effective Date, the
following amendments shall be made to the Committed Facility Letter:

 

		(i)	Paragraph 5.2 (c) of the Committed Facility Letter shall be deleted in its entirety and replaced
with the following:

 

“(c) The tenor of the
Credit extends beyond 31st March 2021;

 

The Bank may, in its sole discretion
consider applications for Credits that are outside the terms of this Letter. Any such requests will be considered on a case-by-case
basis and will be subject to the terms of any Facility Documents then existing.”

 

		(ii)	A new Clause 16 (Data Protection) shall be inserted in the Committed Facility Letter as follows:

 

    1 

     

    

 

“16. Data Protection

 

16.1 Compliance with law.
Each party will comply with applicable data protection and privacy laws in processing personal data in connection with its activities
under this Committed Facility Letter. Without limiting the foregoing, the Companies warrant that: (i) any personal data that it
provides to the Bank has been processed fairly and lawfully, is accurate and is relevant for the purposes for which it is provided
to the Bank; (ii) if any such personal data is provided to the Bank, it shall provide notice to, and shall seek consent from (and
promptly upon the Bank’s request shall provide evidence to the Bank of having provided such notices and/or obtained such
consents), data subjects regarding the Bank’s processing of their personal data in accordance with any instructions of the
Bank from time to time; and (iii) pursuant to clause (ii) it will provide any such data subjects with a copy of the relevant TTS
EEA Privacy Statement accessible at https://www.citibank.com/tts/sa/tts-privacy-statements/index.html (or such other URL or statement
as the Bank may notify to the Companies from time to time).

 

16.2 Mutual cooperation.
Each party will promptly notify, and reasonably cooperate with and provide information to, the other party in respect of any data
subject requests, communications from supervisory authorities, or material security incidents relating to the processing of personal
data under this Committed Facility Letter, in each case to the extent reasonably necessary to enable the other party to meet its
obligations to data subjects and/or supervisory authorities.

 

16.3 Definitions. The
terms ‘personal data’, ‘processing’, ‘data subject’ and ‘supervisory
authority’ shall have the respective meanings set forth in the General Data Protection Regulation (EU) 2016/679, as amended
or superseded from time-to-time.”

 

4. Costs and expenses

 

Each party to this Deed shall bear its
own costs and expenses in relation to the amendments agreed pursuant to the terms of this Deed.

 

5. Affirmation and acceptance

 

		5.1	With effect from the Effective Date, the terms and conditions of the Committed Facility Letter
shall be read and construed by reference to this Deed and all references to the Committed Facility Letter shall be deemed to incorporate
the relevant amendments contained within this Deed and all references in the Committed Facility Letter to “this Committed
Facility Letter” shall with effect from the Effective Date be references to the Committed Facility Letter as amended by this
Deed.

 

		5.2	In the event of any conflict between the terms of this Deed and the Committed Facility Letter,
the terms of this Deed shall prevail.

 

		5.3	For the avoidance of doubt, except as amended by the terms of this Deed, all of the terms and conditions
of the Committed Facility Letter shall continue to apply and remain in full force and effect.

 

		5.5	The Companies shall, at the request of Bank, do all such acts necessary or desirable to give effect
to the amendments effected or to be effected pursuant to the terms of this Deed.

 

    2 

     

    

 

6. Continuation of Security

 

The parties agree that, on and after the
Effective Date:

 

		(i)	The Pledge Agreement dated 14 May 2010, as amended from time to time, most recently on 27 March
2017, between ASL and the Bank and any security granted under it shall continue in full force and effect;

 

		(ii)	The Collateral Account Control Agreement dated 19 May 2015 between ASL and Bank shall continue
in full force and effect;

 

and that such Pledge Agreement and any
security pledged thereunder extend to the Committed Facility Letter, as amended pursuant to this Deed.

 

7. Counterparts

 

This Deed may be executed in counterparts,
each of which shall be deemed to be an original, and all such counterparts taken together shall constitute one and the same agreement.
This amendment shall take effect as a Deed notwithstanding it is signed under hand by Bank.

 

8. Third party rights

 

No person shall have any right to enforce
any provision of this deed under the Contracts (Rights of Third Parties) Act 1999.

 

9. Governing law

 

This Deed (and any non-contractual obligation,
dispute, controversy, proceedings or claim of whatever nature arising out of it or in any way relating to this deed or its formation)
shall be governed by and construed in accordance with English law.

 

 

 

 

 

[Signatures Follow]

 

    3 

     

    

 

Signatories to the Deed of Amendment

 

	EXECUTED AS A DEED UNDER THE COMMON SEAL	 
	OF AXIS Specialty Limited 	Signed: /s/ Peter J.
    Vogt
	Acting as a Director	Name: Peter J. Vogt
	 	Title:  Director
	In the presence of 	Witness: /s/ Jose Osset
	 	Printed Name: Jose Osset
	 	Address: 92 Pitts Bay Road
	 	Pembroke, HM 08 Bermuda 
	 	 
	EXECUTED AS A DEED UNDER THE COMMON	 
	SEAL OF AXIS Re SE	Signed: /s/ Helen O’Sullivan
	Acting as a Director	Name: Helen O’Sullivan
	 	Title:  Director
	In the presence of 	Signed: /s/ Deirdre
    Mooney 
	 	Name: Deirdre Mooney 
	 	Title: Director/Company Secretary
	 	For and on behalf of 
	 	Wilton
    Secretarial Limited Secretary
	 	 
	EXECUTED AS A DEED UNDER THE COMMON	 
	SEAL OF AXIS Specialty Europe SE	Signed: /s/ Helen O’Sullivan
	Acting as a Director	Name: Helen O’Sullivan
	 	Title:  Director
	In the presence of 	Signed: /s/ Deirdre
    Mooney
	 	Name: Deirdre Mooney
	 	Title: Director/Company Secretary
	 	For and on behalf of 
	 	Wilton
    Secretarial Limited Secretary
	 	 
	EXECUTED AS A DEED UNDER THE COMMON	 
	SEAL OF AXIS Insurance Company	Signed: /s/ Andrew M.
    Weissert
	Acting as a Director	Name: Andrew M. Weissert
	 	Title:  Director
	In the presence of 	Witness: /s/ Brenda
    Reese
	 	Name: Brenda Reese
	 	Address:  11680 Great Oaks Way
	 	Alpharetta, GA  30022
	 	 

	EXECUTED AS A DEED UNDER THE	 
	COMMON SEAL OF AXIS Reinsurance Company	Signed: /s/ Andrew M.
    Weissert
	Acting as a Director	Name: Andrew M. Weissert
	 	Title:  Director
	In the presence of 	Witness: /s/ Brenda
    Reese
	 	Name: Brenda Reese
	 	Address:  11680 Great Oaks Way
	 	Alpharetta, GA  30022

 

    4 

     

    

 

 

WE HEREBY CONFIRM OUR ACCEPTANCE ON BEHALF OF BANK:

 

	By:	/s/ Niall Tuckey 	 
	Name:	Niall Tuckey	 
	Title:	Director	 

 

    5

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