Document:

EX-10.10

 Exhibit 10.10 

CASA SYSTEMS, INC. 

Restricted Stock Unit Award Agreement 

Granted Under 2011 Stock Incentive Plan 
  

	1.	Grant of RSUs. 

 This agreement (this “Agreement”) evidences the grant by Casa
Systems, Inc., a Delaware corporation (the “Company”), on             , 201     to             , an
employee of the Company (the “Participant”), of an award of a total of                 restricted stock units (the “Award”), on the terms provided
herein and in the Company’s 2011 Stock Incentive Plan (the “Plan”). Each restricted stock unit entitles the Participant to one share of common stock, $0.001 par value per share (“Common Stock”), of the Company, subject to
continued employment, upon vesting. 
  

	2.	Vesting Schedule. 

 (a) Upon the vesting of this Award, as described in this
Section, the Company shall deliver to the Participant for each restricted stock unit that becomes vested, one (1) share of Common Stock (each such share, a “Share,” and such shares collectively, the “Shares”);
provided, however, that the Company shall withhold from the Participant at the time of delivery of the Shares the amount that the Company determines necessary to pay applicable withholding taxes as and to the extent provided in
Section 8 below; and provided, further, that any fraction of a Share otherwise deliverable to the Participant as a result of a computation made pursuant to this Section or Section 8 shall be rounded down to the nearest whole
Share. The Common Stock shall be delivered as soon as practicable following each vesting date or event set forth below, but in any case within 30 days after such date or event. 

(b) Subject to Sections 2(c), 2(d) and 3, [25%] of the Restricted Stock Units shall become vested and payable to the Participant on the first
anniversary of the Vesting Commencement Date (as defined below), [25%] of the Restricted Stock Units shall become vested and payable to the Participant on the second anniversary of the Vesting Commencement Date, [25%] of the Restricted Stock Units
shall become vested and payable to the Participant on the third anniversary of the Vesting Commencement Date, and [25%] of the Restricted Stock Units shall become vested and payable to the Participant on the fourth anniversary of the Vesting
Commencement Date, in each case so long as the Participant remains employed with the Company through each such vesting date. 
 (c)
Notwithstanding Section 2(b), if the Participant dies or becomes disabled (within the meaning of Section 22(e)(3) of the Code) prior to the date on which all Restricted Stock Units have become vested and prior to the date on which the
unvested portion of this Award has been terminated pursuant to Section 3, upon the Participant’s death or disability, this Award shall become immediately and fully vested. 

(d) Notwithstanding Section 2(b), if within twelve months following a Sale (as defined below) of the Company, the Participant’s
employment with the Company or the acquiring or succeeding corporation is terminated for Good Reason (as defined below) by the Participant in accordance with Good Reason Process (as defined below) or is terminated without

 
Cause (as defined below) by the Company or the acquiring or succeeding corporation, this Award shall become immediately and fully vested. 

For purposes of this agreement, the following term shall have the following meaning: 

“Good Reason” shall exist upon (i) a material diminution in Participant’s base compensation; (ii) a material
diminution in Participant’s then authority, duties or responsibilities; (iii) a material change in geographic location at which participant performs services; or (iv) any material breach by the Company of this Agreement. 

“Good Reason Process” means the following series of actions: (i) the Participant reasonably determines in good faith that Good
Reason exists, (ii) the Participant notifies the Company or the acquiring or succeeding corporation in writing of the existence of Good Reason within 60 days of the occurrence of the event that gave rise to the existence of Good Reason,
(iii) the Participant cooperates in good faith with the Company’s (or the acquiring or succeeding corporation’s) efforts to remedy the conditions that gave rise to the existence of Good Reason for a period of 30 days following such
notice (such 30 day period, the “Cure Period”), (iv) notwithstanding such efforts, Good Reason continues to exist and (v) the Participant terminates his employment within 30 days after the end of the Cure Period. For the
avoidance of doubt, if the Company or the acquiring or succeeding corporation successfully remedies the conditions that gave rise to the existence of Good Reason during the Cure Period, Good Reason shall be deemed not to have existed. 

If the Participant is party to an employment, consulting or severance agreement with the Company that contains a definition of
“cause” for termination of employment or other relationship, “Cause” shall have the meaning ascribed to such term in such agreement. Otherwise, “Cause” shall mean willful misconduct by the Participant or willful failure
by the Participant to perform his or her responsibilities to the Company (including, without limitation, breach by the Participant of any provision of any employment, consulting, advisory, nondisclosure, non-competition or other similar agreement
between the Participant and the Company), as determined by the Company, which determination shall be conclusive. The Participant’s employment or other relationship shall be considered to have been terminated for “Cause” if the Company
determines, within 30 days after the Participant’s resignation, that termination for Cause was warranted. 
  

	3.	Termination of Employment. 

 Notwithstanding any other provision of the Plan to the
contrary, upon the termination of the Participant’s employment with the Company and its subsidiaries for any reason whatsoever, this Award, to the extent not yet vested, shall immediately and automatically terminate; provided,
however, that the Board of Directors of the Company (the “Board”) may, in its sole and absolute discretion and pursuant to the terms and provisions of the Plan, agree to accelerate the vesting of this Award, upon termination of
employment or otherwise, for any reason or no reason, but shall have no obligation to do so. 
 For purposes of the Plan and this Award, a
termination of employment shall be deemed to have occurred on the date upon which the Participant ceases to perform active employment 

 
duties for the Company following the provision of any notification of termination or resignation from employment, and without regard to any period of notice of termination of employment (whether
expressed or implied) or any period of severance or salary continuation. Notwithstanding any other provision of the Plan, or this Agreement or any other agreement (written or oral) to the contrary, the Participant shall not be entitled (and by
accepting an Award, thereby irrevocably waives any such entitlement) to any payment or other benefit to compensate the Participant for the loss of any rights under the Plan as a result of the termination or expiration of an Award in connection with
any termination of employment. No amounts earned pursuant to the Plan or any Award shall be deemed to be eligible compensation in respect of any other plan of the Company or any of its subsidiaries. 

 

	4.	Company Right of First Refusal. 

 (a) Notice of Proposed Transfer. If the
Participant proposes to sell, assign, transfer, pledge, hypothecate or otherwise dispose of, by operation of law or otherwise (collectively, “transfer”) any Shares acquired upon the vesting of this Award, then the Participant shall first
give written notice of the proposed transfer (the “Transfer Notice”) to the Company. The Transfer Notice shall name the proposed transferee and state the number of such Shares the Participant proposes to transfer (the “Offered
Shares”), the price per share and all other material terms and conditions of the transfer. 
 (b) Company Right to Purchase. For
30 days following its receipt of such Transfer Notice, the Company shall have the option to purchase all or part of the Offered Shares at the price and upon the terms set forth in the Transfer Notice. In the event the Company elects to purchase all
or part of the Offered Shares, it shall give written notice of such election to the Participant within such 30-day period. Within 10 days after his or her receipt of such notice, the Participant shall tender to the Company at its principal offices
the certificate or certificates representing the Offered Shares to be purchased by the Company, duly endorsed in blank by the Participant or with duly endorsed stock powers attached thereto, all in a form suitable for transfer of the Offered Shares
to the Company. Promptly following receipt of such certificate or certificates, the Company shall deliver or mail to the Participant a check in payment of the purchase price for such Offered Shares; provided that if the terms of
payment set forth in the Transfer Notice were other than cash against delivery, the Company may pay for the Offered Shares on the same terms and conditions as were set forth in the Transfer Notice; and provided further that any delay
in making such payment shall not invalidate the Company’s exercise of its option to purchase the Offered Shares. 
 (c) Shares Not
Purchased By Company. If the Company does not elect to acquire all of the Offered Shares, the Participant may, within the 30-day period following the expiration of the option granted to the Company under subsection (b) above, transfer the
Offered Shares which the Company has not elected to acquire to the proposed transferee, provided that such transfer shall not be on terms and conditions more favorable to the transferee than those contained in the Transfer Notice.
Notwithstanding any of the above, all Offered Shares transferred pursuant to this Section 4 shall remain subject to the right of first refusal set forth in this Section 4 and such transferee shall, as a condition to such transfer, deliver
to the Company a written instrument confirming that such transferee shall be bound by all of the terms and conditions of this Section 4. 

 (d) Consequences of Non-Delivery. After the time at which the Offered Shares are required
to be delivered to the Company for transfer to the Company pursuant to subsection (b) above, the Company shall not pay any dividend to the Participant on account of such Offered Shares or permit the Participant to exercise any of the privileges
or rights of a stockholder with respect to such Offered Shares, but shall, insofar as permitted by law, treat the Company as the owner of such Offered Shares. 

(e) Exempt Transactions. The following transactions shall be exempt from the provisions of this Section 4: 

(1) any transfer of Shares to or for the benefit of any spouse, child or grandchild of the Participant, or to a trust for their benefit; 

(2) any transfer pursuant to an effective registration statement filed by the Company under the Securities Act of 1933, as amended (the
“Securities Act”); and 
 (3) the sale of all or substantially all of the outstanding shares of capital stock of the Company
(including pursuant to a merger or consolidation); 
 provided, however, that in the case of a transfer pursuant to clause (1) above,
such Shares shall remain subject to the right of first refusal set forth in this Section 4. 
 (f) Assignment of Company Right.
The Company may assign its rights to purchase Offered Shares in any particular transaction under this Section 4 to one or more persons or entities 

(g) The provisions of this Section 4 shall terminate upon the earlier of the following events: 

(1) the closing of the sale of shares of Common Stock in an underwritten public offering pursuant to an effective registration statement filed
by the Company under the Securities Act; or 
 (2) the sale of all or substantially all of the outstanding shares of capital stock, assets
or business of the Company, by merger, consolidation, sale of assets or otherwise (other than a merger or consolidation in which all or substantially all of the individuals and entities who were beneficial owners of the Company’s voting
securities immediately prior to such transaction beneficially own, directly or indirectly, more than 75% (determined on an as-converted basis) of the outstanding securities entitled to vote generally in the election of directors of the resulting,
surviving or acquiring corporation in such transaction). A transaction of the type contemplated in this Section 4(g)(2) is referred to herein as a “Sale” of the Company. 

(h) The Company shall not be required (1) to transfer on its books any of the Shares which shall have been sold or transferred in
violation of any of the provisions set forth in this Section 4, or (2) to treat as owner of such Shares or to pay dividends to any transferee to whom any such Shares shall have been so sold or transferred. 

 (i) Legends. The certificate representing Shares shall bear a legend substantially in the
following form (in addition to, or in combination with, any legend required by applicable federal and state securities laws and agreements relating to the transfer of the Company securities): 

“The shares represented by this certificate are subject to a right of first refusal in favor of the Company, as provided in a certain
restricted stock unit award agreement with the Company.” 
  

	5.	Agreement in Connection with Initial Public Offering. 

 The Participant agrees, in
connection with the initial underwritten public offering of the Common Stock pursuant to a registration statement under the Securities Act, (i) not to (a) offer, pledge, announce the intention to sell, sell, contract to sell, sell any
option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any other securities of the Company
or (b) enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of ownership of shares of Common Stock or other securities of the Company, whether any transaction described in clause
(a) or (b) is to be settled by delivery of securities, in cash or otherwise, during the period beginning on the date of the filing of such registration statement with the Securities and Exchange Commission and ending 180 days after the
date of the final prospectus relating to the offering (plus up to an additional 34 days to the extent requested by the managing underwriters for such offering in order to address FINRA Rule 2711(f)(4) or NYSE Rule 472(f)(4) or any similar successor
provision), and (ii) to execute any agreement reflecting clause (i) above as may be requested by the Company or the managing underwriters at the time of such offering. The Company may impose stop-transfer instructions with respect to the
shares of Common Stock or other securities subject to the foregoing restriction until the end of the “lock-up” period. 
  

	6.	No Assignment; Transfer Restrictions. 

 (a) Except as expressly permitted under the
Plan, this Agreement may not be assigned by the Participant by operation of law or otherwise. 
 (b) The Participant agrees that he or she
will not transfer any Shares issued pursuant to this Award unless the transferee, as a condition to such transfer, delivers to the Company a written instrument confirming that such transferee shall be bound by all of the terms and conditions of
Section 4 and Section 5; provided that such a written confirmation shall not be required with respect to (1) Section 4 after such provision has terminated in accordance with Section 4(g) or (2) Section 5 after the
completion of the lock-up period in connection with the Company’s initial underwritten public offering. 
  

	7.	No Rights to Continued Employment. 

 Neither this Agreement nor this Award shall be
construed as giving the Participant any right to continue in the employ of the Company or any of its subsidiaries, or shall interfere in any way with the right of the Company to terminate such employment. 

	8.	Tax Obligations. 

 As a condition to the granting of this Award and the vesting thereof,
the Participant acknowledges and agrees that he/she is responsible for the payment of income and employment taxes (and any other taxes required to be withheld) payable in connection with the vesting of an Award. The Company shall retain and withhold
from delivery at the time of vesting that number of Shares having a fair market value equal to the taxes owed by the Participant, which retained Shares shall fund the payment of such taxes by the Company on behalf of the Participant. Notwithstanding
the immediately preceding sentence, the Participant may, by written notice to the Company delivered not less than five days prior to a vesting date, elect to remit to the Company or any applicable subsidiary an amount sufficient to pay such taxes in
lieu of the Company retaining and withholding Shares to fund the payment of such taxes. If the Participant makes such an election, the Participant shall make such payment to the Company or the applicable subsidiary of the Company on or before the
applicable vesting date in a form that is reasonably acceptable to the Company, as the Company may determine in its sole discretion. 
  

	9.	Notices. 

 All notices required or permitted hereunder shall be in writing and deemed
effectively given upon personal delivery or five days after deposit in the United States Post Office, by registered or certified mail, postage prepaid, addressed to the other party hereto at the address shown beneath his or its respective signature
to this Agreement, or at such other address or addresses as either party shall designate to the other in accordance with this Section 9. 
  

	10.	Failure to Enforce Not a Waiver.  

 The failure of the Company to enforce at any time
any provision of this Agreement shall in no way be construed to be a waiver of such provision or of any other provision hereof. 
  

	11.	Amendments. 

 This Agreement may be amended or modified at any time by an instrument in
writing signed by the parties hereto. 
  

	12.	Authority. 

 The Board has complete authority and discretion to determine Awards, and to
interpret and construe the terms of the Plan and this Agreement. The determination of the Board as to any matter relating to the interpretation or construction of the Plan or this Agreement shall be final, binding and conclusive on all parties. 

 

	13.	Rights as a Stockholder. 

 The Participant shall have no rights as a stockholder of the
Company with respect to any shares of common stock of the Company underlying or relating to any Award until the issuance of a stock certificate to the Participant in respect of such Award. 

 

	14.	Provisions of the Plan. 

 This Award is subject to the provisions of the Plan (including the provisions relating to
amendments to the Plan), a copy of which is furnished to the Participant with this Award. 
 IN WITNESS WHEREOF, the Company has caused this
Award to be executed under its corporate seal by its duly authorized officer. This Award shall take effect as a sealed instrument. 
  

					
	CASA SYSTEMS, INC.
		
	By:	 	 
		 	Name:	 	 
		 	Title:	 	 

 PARTICIPANT’S ACCEPTANCE 

The undersigned hereby accepts the foregoing Award and agrees to the terms and conditions thereof. The undersigned hereby acknowledges receipt
of a copy of the Company’s 2011 Stock Incentive Plan. 
  

			
	PARTICIPANT:
	
	 

 
			
		
	Address:EX-10.11

 Exhibit 10.11 

CASA SYSTEMS, INC. 
 Stock
Appreciation Rights Agreement 
 Granted under 2011 Stock Incentive Plan 

This Agreement evidences the grant by Casa Systems, Inc., a Delaware corporation (the “Company”), on
            ,      20[    ] (the “Grant Date”) to
                     (the “Participant”) of a stock appreciation right of the Company (this “SAR”) on the terms provided herein
and in the Company’s 2011 Stock Incentive Plan (the “Plan”). This SAR represents the right to receive, upon exercise of such right, cash in an amount equal to the appreciation from and after the Grant Date in the Fair Market Value of
a share of Common Stock, $0.001 par value per share (“Common Stock”), of the Company over the Measurement Price, as provided in this Agreement, with respect to the number of shares of Common Stock with respect to which this SAR is
exercised. Unless earlier terminated, this SAR shall expire on             ,      20[    ] (the “Final Exercise Date”). All capitalized
terms used herein and not otherwise defined shall have the same meaning ascribed thereto in the Plan. 
  

	1.	Definitions. Solely for the purposes of, and as used in, this Agreement: 

  

	 	(a)	“Board” means the Board of Directors of the Company. 

  

	 	(b)	“Exercise Date” has the meaning given thereto in Section 3 hereof. 

  

	 	(c)	“Expiration Date” means the earliest of (i) the Final Exercise Date, (ii) that date on which the Participant is terminated for Cause (as defined below), (iii) the date on which this SAR
terminates pursuant to Section 3(d) hereof and (iv) any other date, event or reason provided for hereunder or under the Plan. 

  

	 	(d)	“Expiration Time” means 5:00 p.m. (local time) on the Expiration Date. 

  

	 	(e)	“Fair Market Value” means the market value of one share of Common Stock, as determined by such means as reasonably determined to be appropriate by the Board. 

 

	 	(f)	“Measurement Price” shall be $[            ] per share. 

 

	 	(g)	“Vesting Date” means each of those dates which is specified in Section 2 hereof. 

  

	2.	Grant, Vesting and Expiration of SAR. Subject to the terms and conditions set forth in the Plan and this Agreement: 

  

	 	(a)	The Company has granted to the Participant an SAR entitling the Participant, upon exercise, to an amount in cash equal to the appreciation from and after the Grant Date in the Fair Market Value of
[            ] shares of Common Stock (the “Measurement Shares”) over the Measurement Price of this SAR. 

	 	(b)	Except as provided below, this SAR will become exercisable (“vest”) as to 25% of the original number of Measurement Shares on the first anniversary of the Vesting Commencement Date (as defined below) and as to
an additional 2.0833% of the original number of Measurement Shares at the end of each successive one-month period following the first anniversary of the Vesting Commencement Date until the fourth anniversary of the Vesting Commencement Date. For
purposes of this Agreement, the “Vesting Commencement Date” shall mean             ,      20[    ]. 

The right of exercise shall be cumulative so that to the extent this SAR is not exercised in any period to the maximum extent permissible it
shall continue to be exercisable, in whole or in part, with respect to all Measurement Shares for which it is vested until the Expiration Time unless sooner exercised or terminated in accordance with this Agreement. 

 

	 	(c)	Unless sooner exercised or terminated in accordance with this Agreement, this SAR shall expire and terminate at the Expiration Time and, thereafter, this SAR shall be null and void and have no further force or effect
whatsoever. 

  

	3.	Exercise of SAR. This SAR shall be exercised on the Exercise Date with respect to the number of Measurement Shares for which this SAR is vested as of such date or such lesser number as the Participant chooses,
but not with respect to fewer than the lesser of (i) 100 shares or (ii) the number of remaining Measurement Shares covered by this SAR. To the extent that this SAR is not vested on the Final Exercise Date, any unvested portion shall
immediately and automatically expire on such date, unless the Board determines in its sole discretion to accelerate the vesting of part or all of the unvested portion of this SAR and permit its immediate exercise. Notwithstanding anything to the
contrary herein, in the event the Participant is terminated for Cause, any right that the Participant may have to exercise this SAR shall be automatically forfeited immediately upon such termination. 

 

	 	(a)	Exercise Date. The “Exercise Date” shall be the actual date or dates specified by the Participant in a written notice of exercise provided to the Company pursuant to subsection 3(b). 

 

	 	(b)	Notice of Exercise. The Participant shall provide to the Company a written notice of exercise in the form attached hereto as Exhibit A designating the Exercise Date pursuant to subsection 3(a), such notice
to be provided no later than 15 days prior to any such designated Exercise Date. Such notice shall be irrevocable once received by the Company. 

  

	 	(c)	Continuous Relationship with the Company Required. Except as otherwise provided in this Section 3, this SAR may not be exercised unless the Participant, at the time he or she exercises this SAR, is, and has
been at all times since the Grant Date, an employee, officer or director of, or consultant or advisor to, the Company or any parent or subsidiary of the Company as defined in Section 424(e) or (f) of the Code and any other business venture
(including, without limitation, joint venture or limited liability company) in which the Company has a controlling interest as determined by the Board (an “Eligible Participant”). 

	 	(d)	Termination of Relationship with the Company. If the Participant ceases to be an Eligible Participant for any reason, then, except as provided in paragraph (e) below, the right to exercise this SAR shall
terminate three months after such cessation (but in no event after the Final Exercise Date); provided that this SAR shall be exercisable only for that number of Measurement Shares that were vested under this SAR on the date the Participant
ceased to be an Eligible Participant. Notwithstanding anything to the contrary contained herein, if the Participant, prior to the Final Exercise Date, violates the non-competition or confidentiality provisions of any employment contract,
confidentiality and nondisclosure agreement or other agreement between the Participant and the Company, the right to exercise this SAR shall terminate immediately upon written notice to the Participant from the Company describing such violation.

  

	 	(e)	Discharge for Cause. Notwithstanding anything to the contrary contained herein, if the Participant, prior to the Final Exercise Date, is discharged by the Company for “Cause” (as defined below), the
right to exercise this SAR shall terminate immediately upon the effective date of such discharge. “Cause” shall mean willful misconduct by the Participant or willful failure by the Participant to perform his or her responsibilities to the
Company (including, without limitation, breach by the Participant of any provision of any employment, consulting, advisory, nondisclosure, non-competition or other similar agreement between the Participant and the Company), as determined by the
Company, which determination shall be conclusive. The Participant shall be considered to have been discharged for “Cause” if the Company determines, within 30 days after the Participant’s resignation, that discharge for Cause was
warranted. 

  

	4.	Calculation of Cash Amount Deliverable on Exercise of SAR. The cash amount (if any) which the Participant may be entitled to receive in accordance with this Agreement in respect of any exercise of SARs shall be
calculated by the Company in accordance with the provisions of this Agreement and the Plan as soon as is reasonably practicable following the Exercise Date of any portion of this SAR, but in no event later than the delivery date specified in
Section 5 hereof; provided, however, that the cash amount as so calculated shall be subject to the review and approval by the Company’s Chief Executive Officer, acting reasonably; and such amounts, as so finally approved by the
Company’s Chief Executive Officer, shall be final and binding upon the parties hereto. 

  

	5.	Delivery of Cash Due on Exercise of SAR. The cash amount to which the Participant is entitled upon each exercise of this SAR shall be delivered by the Company to the Participant following the date on which the
Fair Market Value has been determined pursuant to Section 1(e) hereof, but no later than 60 days following the Exercise Date. The delivery of the cash amount due upon each such exercise shall be subject to all applicable income and employment
tax and social security contribution withholding. 

  

	6.	 Nontransferability of SAR. This SAR may not be sold, assigned, transferred, pledged or otherwise
encumbered by the Participant, either voluntarily or by operation of law, except by will or the laws of descent (or jurisdictional equivalent) and distribution to a 

	 	
transferee that has been approved by the Company, and, during the lifetime of the Participant, this SAR shall be exercisable only by the Participant. 

 

	7.	No Right To Employment or Other Status. The grant of this SAR shall not be construed as giving the Participant the right to continued employment or any other relationship with the Company. The Company expressly
reserves the right at any time to dismiss or otherwise terminate its relationship with a Participant free from any liability or claim under this Agreement. 

  

	8.	No Effect on Running the Business. The Participant understands and agrees that the existence of this SAR will not affect in any way the right or power of the Company or its stockholders to make or authorize any
adjustments, recapitalizations, reorganizations, or other changes in the Company’s capital structure or its business, or any merger or consolidation of the Company, or any issuance of bonds, debentures, preferred or other stock, with preference
ahead of or convertible into, or otherwise affecting the Company’s Common Stock or the rights thereof, or the dissolution or liquidation of the Company, or any sale or transfer of all or any part of its assets or business, or any other
corporate act or proceeding, whether or not of a similar character to those described above. 

  

	9.	Data Protection. The Participant agrees to the receipt, holding and processing of information in connection with the grant, vesting, exercise, taxation and general administration of the Plan and this SAR by the
Company or any subsidiary of the Company and any of their advisers or agents and to the transmission of such information outside of [the People’s Republic of China] for this purpose. 

 

	10.	Provisions of the Plan. This SAR is subject to the provisions of the Plan, a copy of which is furnished to the Participant with this SAR, as such Plan may be amended from time to time. 

 

	11.	Participant’s Acknowledgements. By acceptance of this SAR, the Participant agrees to the terms and conditions hereof and acknowledges receipt of a copy of the Plan. 

[Remainder of Page Intentionally Left Blank] 

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

			
	CASA SYSTEMS, INC.
		
	By:	 	 
		 	 Name:
 Title:

	
	PARTICIPANT
		
		 	 
		 	[            ]
		 	Address:

 Exhibit A 

SAR NOTICE OF EXERCISE 
 Date:
                        1 

Casa Systems, Inc. 
  

	
	 
	
	 

 Attention: Treasurer 
 Dear Sir
or Madam: 
 I am the holder of a stock appreciation right (“SAR”) granted to me under the Casa Systems, Inc. (the
“Company”) 2011 Stock Incentive Plan on                     2 (the “Grant
Date”) measured by the appreciation from and after the Grant Date in the Fair Market Value of                     3 shares of Common Stock of the Company. 
 I hereby exercise my SAR in relation to
                    4 shares of Common Stock. 

Please deliver the cash amount of the appreciation with respect to such shares (after deduction of all applicable income and employment tax
and social security contributions withholding) to the following bank account: 
  

					
	Name of bank:	    	 	    	
			
	Sort Code:	    	 	    	
			
	Account number:	    	 	    	

  

	
	Very truly yours,
	
	   

	 (Signature)

  

	1 	Enter the date of exercise. 

	2 	Enter the date of grant. 

	3 	Enter the total number of shares of Common Stock in relation to which the SAR was granted. 

	4 	Enter the number of shares of Common Stock in relation to which the SAR is now being exercised.

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