Document:

First Amendment to Lease

 Exhibit 10.1 
 FIRST AMENDMENT TO LEASE 
 THIS FIRST AMENDMENT TO LEASE (“First Amendment”) is made and entered into as of the 23rd day of September, 2008, by and
between MULLROCK 3 TORREY PINES, LLC, a Delaware limited liability company (“Landlord”) and OREXIGEN THERAPEUTICS, INC., a Delaware corporation (“Tenant”). 
 R E C I T A L S: 
 A. Landlord
and Tenant entered into that certain Office Lease dated as of December 7, 2007 (the “Lease”), whereby Landlord leased to Tenant and Tenant leased from Landlord certain office space located in that certain building located and
addressed at 3344 North Torrey Pines Court, San Diego, California (the “Building”). 
 B. By this First Amendment,
Landlord and Tenant desire to expand the Existing Premises (as defined below) and to otherwise modify the Lease as provided herein. 
 C.
Unless otherwise defined herein, capitalized terms as used herein shall have the same meanings as given thereto in the Lease. 
 NOW,
THEREFORE, in consideration of the foregoing recitals and the mutual covenants contained herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows:

 A G R E E M E N T: 
 1. The Existing Premises. Landlord and Tenant hereby agree that pursuant to the Lease,
Landlord currently leases to Tenant and Tenant currently leases from Landlord approximately 22,229 rentable and 19,818 usable square feet (consisting of 9,628 rentable and 8,584 usable square feet of space on the first (1st) floor of the Building and 12,601 rentable and 11,234 usable square feet of space on the second (2nd) floor of the Building) (collectively, the “Existing Premises”), as more particularly described in the Lease. 
 2. Expansion of the Existing Premises; Expansion Commencement Date. 
 2.1. Expansion Space. That certain space located on the plaza level of the Building containing approximately 9,312 rentable (8,281
usable) square feet in the Building as outlined on the floor plan attached hereto as Exhibit “A” and made a part hereof, may be referred to herein as the “Expansion Space.” 
 2.2. Expansion Commencement Date. Effective as of the date (“Expansion Commencement Date”) that is the later of
(i) April 1, 2009 or (ii) the date of Substantial Completion of the Improvements (as defined in the Work Letter Agreement attached hereto as Exhibit “B”) (or the date Substantial Completion would have occurred but for Tenant
Delays (as defined in Exhibit “B”)), Tenant shall lease from Landlord and Landlord shall lease to Tenant the Expansion Space. Accordingly, effective upon the Expansion Commencement Date, the Existing Premises shall be increased to include
the Expansion Space. Landlord and Tenant hereby stipulate and agree that such addition of the Expansion Space to the Existing Premises shall, effective as of the Expansion Commencement Date, increase the number of square feet leased by Tenant in the
Project to a total of 31,541 rentable (28,099 usable) square feet. Effective as of the Expansion Commencement Date, all references to the “Premises” shall mean and refer to the Existing Premises as expanded by the Expansion Space.

 3. Expansion Space Term. The term of the Lease of the Expansion Space shall commence as of the Expansion Commencement Date and
shall terminate on the July 31, 2013 lease expiration date (“Lease Expiration Date”). The period from the Expansion Commencement Date through the Lease Expiration Date shall be referred to herein as the “Expansion Space
Term.” 

 4. Monthly Basic Rent for the Expansion Space. Effective as of the Expansion Commencement Date,
Tenant shall pay, in accordance with the provisions of this Section 4, and subject to abatement pursuant to Section 5 below, Monthly Basic Rent for the Expansion Space as follows: 
  

							
	Months of Lease Term	  	Monthly Basic Rent	  	Monthly Basic Rent Per
Rentable Square Foot
	Expansion
Commencement Date – 12	  	$	33,988.80	  	$	3.65
	13 – 24	  	$	35,199.36	  	$	3.78
	25 – 36	  	$	36,409.92	  	$	3.91
	37 – 48	  	$	37,713.60	  	$	4.05
	49 – Lease Expiration Date	  	$	39,017.28	  	$	4.19

 5. Monthly Basic Rent Abatement.
Notwithstanding anything to the contrary contained in the Lease or in this First Amendment, and provided that Tenant faithfully performs all of the terms and conditions of the Lease, as amended by this First Amendment, Landlord hereby agrees to
abate Tenant’s obligation to pay Monthly Basic Rent for the second (2nd) month of the Expansion Space Term. During such abatement period,
Tenant shall still be responsible for the payment of all of its other monetary obligations under the Lease, as amended by this First Amendment. 
 6. Tenant’s Percentage and Base Year. Notwithstanding anything to the contrary in the Lease, commencing as of the Expansion Commencement Date and continuing during the Expansion Space Term, Tenant’s Percentage for the
Premises (including the Existing Premises and the Expansion Space) shall be 68.21% and the Base Year for the Expansion Space shall be the calendar year 2009. The Base Year for the Existing Premises shall remain the calendar year 2008. The
total rentable square feet of the Building is 46,238 feet, and the total square feet leased by Tenant in the Project is 31,541 rentable (28,099 usable) square feet. 
 7. Additional Exterior Sign. Subject to the approval of all applicable governmental and quasi-governmental entities, and subject to any covenants, conditions and restrictions and all applicable governmental and
quasi-governmental laws, rules, regulations and codes and the terms and conditions of the Lease, Landlord grants Tenant the exclusive right to install one (1) additional exterior sign on the south face of the Building (with the exact location
to be determined by Landlord and approved by Tenant such approval not to be unreasonably withheld or delayed) (the “Additional Exterior Sign”). Such Additional Exterior Sign shall be at an initial monthly fee to Tenant of Five
Hundred Dollars ($500.00) per month (which amount shall be payable by Tenant to Landlord at the same time and in the same manner as Monthly Basic Rent is payable by Tenant under the Lease) and which monthly fee is subject to increase during the
Option Term described in Section 2.2 of the Lease. All of the other terms, conditions and provisions of Section 6.2(b) of the Lease (pertaining to Tenant’s Exterior Signage) shall apply to Tenant’s rights to the Additional
Exterior Sign. 
 8. Brokers. Each party represents and warrants to the other that no broker, agent or finder negotiated or was
instrumental in negotiating or consummating this First Amendment other than The Muller Company (“Landlord’s Broker”) and The Staubach Company-San Diego, Inc. (“Tenant’s Broker”). Each party further agrees
to defend, indemnify and hold harmless the other party from and against any claim for commission or finder’s fee by any entity (other than Landlord’s Broker or Tenant’s Broker) who claims or alleges that they were retained or engaged
by the first party or at the request of such party in connection with this First Amendment. 
 9. Parking. Effective as of the
Expansion Commencement Date, Tenant shall be entitled to an additional twenty-two (22) unreserved, uncovered parking privileges and three (3) additional reserved parking privileges in the subterranean garage at the Project, all at no
additional cost to Tenant. Tenant’s use of such additional parking privileges shall be subject to all of the terms and provisions of Section 6.2 of the Lease. Effective as of the date hereof, Tenant hereby exercises its right to lease the
additional three (3) reserved parking privileges provided to Tenant under Section 1.16 of the Summary of the Lease (at the initial parking rate provided therein and subject to increase during the Option Term as provided therein) except
that Tenant’s leasing of such additional three (3) reserved parking spaces shall be irrevocable and Tenant shall not have the right to rescind its obligation to lease such additional three (3) reserved parking spaces). 
  

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 10. Condition of the Expansion Space. Except as specifically set forth in the Lease (and the Work
Letter Agreement attached hereto), after Landlord substantially completes the Tenant Improvements and subject to Section 11.1 of the Lease, Tenant hereby agrees to accept the Expansion Space in its “as-is” condition and Tenant hereby
acknowledges that Landlord, except as provided in the Work Letter Agreement attached hereto as Exhibit “B,” shall not be obligated to provide or pay for any improvement work or services related to the improvement of the Expansion Space.
Tenant also acknowledges that Landlord has made no representation or warranty regarding the condition of the Expansion Space. 
 11. Early
Entry. Tenant’s early entry rights are set forth in Section 6.1 of Exhibit “B” attached hereto. 
 12. Existing
Letter of Credit; Additional Letter of Credit. 
 12.1. Existing Letter of Credit. Tenant has previously deposited
with Landlord a Letter of Credit in the initial amount of One Million Dollars ($1,000,000.00) (“Existing Letter of Credit”). Landlord shall continue to hold the Existing Letter of Credit, subject to any reduction per the terms of
the Lease, in accordance with the terms and conditions of Section 5 of the Lease. 
 12.2. Additional Letter of Credit. Concurrently with Tenant’s execution and delivery of this First Amendment to Landlord, Tenant shall deliver to Landlord, as protection for Landlord to assure the full and
faithful performance by Tenant of all of its obligations under the Lease (as modified by this First Amendment) and for all losses and damages Landlord may suffer as a result of any default (beyond the expiration of all applicable notice and cure
periods) by Tenant under the Lease (as modified by this First Amendment), an irrevocable and unconditional negotiable letter or letters of credit (collectively, the “Letter of Credit”), in substantially the form as the Existing
Letter of Credit, running in favor of Landlord issued by Silicon Valley Bank, or such other bank that is reasonably acceptable to Landlord (“Bank”), and under the supervision of the Superintendent of Banks of the State of
California, in the initial amount, in the aggregate, of Four Hundred Twenty Thousand Dollars ($420,000.00) (“Stated Amount”); provided, however, that, except as hereinafter provided, commencing on the first (1st) anniversary of the Expansion Commencement Date and on each annual anniversary of the Expansion Commencement Date thereafter (each, an
“Adjustment Date”), the Stated Amount shall, subject to the terms hereof, be reduced, in the aggregate, as follows: 
  

				
	Adjustment Date	  	Stated Amount
	Initial Amount	  	$	420,000.00
	Month 13 of Expansion Space Term	  	$	281,400.00
	Month 25 of Expansion Space Term	  	$	188,538.00
	Month 37 of Expansion Space Term	  	$	94,269.00
	Month 49 of Expansion Space Term	  	$	0.00

 However, if (i) a default (beyond the expiration of all applicable notice and cure periods)
by Tenant occurs under the Lease (as modified by this First Amendment), or (ii) circumstances exist that would, with notice or lapse of time, or both, constitute a default by Tenant, and Tenant has failed to cure such default within the cure
period permitted by Section 23 of the Lease or such lesser time as may remain before the relevant Adjustment Date as provided above, the Stated Amount shall not thereafter be reduced unless and until such default shall have been fully cured
pursuant to the terms of the Lease, at which time the Stated Amount may be reduced as hereinabove described. All of the terms and provisions of Section 5 of the Lease pertaining to the Existing Letter of Credit shall apply with full force to
the Additional Letter of Credit except to the extent inconsistent with the terms hereof. 
  

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 13. Signing Authority. Each individual executing this First Amendment on behalf of Tenant and
Landlord hereby represents and warrants that it is a duly incorporated and existing entity qualified to do business in the State of California and that it has full right and authority to execute and deliver this First Amendment and that each person
signing on behalf of Landlord and Tenant is authorized to do so. 
 14. No Further Modification. Except as set forth in this First
Amendment, all of the terms and provisions of the Lease shall remain unmodified and in full force and effect. 
 IN WITNESS WHEREOF, this
First Amendment has been executed as of the day and year first above written. 
  

													
	LANDLORD:	 		 	MULLROCK 3 TORREY PINES, LLC, a Delaware limited liability company
				
		 		 	By:	 	 Mullrock 3 Torrey Pines Manager, LLC,
 a
Delaware limited liability company
 Its Non-Member Manager

				
		 		 	By:	 	 Mullrock 3, LLC,
 a Delaware limited
liability company
 Its Sole Member

					
		 		 		 	By:	 	 Muller-Rock 3, LLC,
 a California limited
liability company
 Its Managing Member

						
		 		 		 		 	By:	 	/s/ Stephen J. Muller
		 		 		 		 		 	Name:	 	Stephen J. Muller
		 		 		 		 		 	Title:	 	Managing Member

  

													
	“TENANT”	 		 	 OREXIGEN THERAPEUTICS, INC.,
 a Delaware
corporation

				
		 		 	By:	 	/s/ Graham K. Cooper
		 		 		 	Print Name:	 	Graham K. Cooper
		 		 		 	Print Title:	 	Chief Financial Officer
				
		 		 	By:	 	/s/ Anthony McKinney
		 		 		 	Print Name:	 	Anthony McKinney
		 		 		 	Print Title:	 	Chief Business Officer

  

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 EXHIBIT “A” 
 EXPANSION SPACE 
 

 
 This Exhibit “A” is provided for informational purposes only and is intended to be only an approximation of the
layout of the Expansion Space and shall not be deemed to constitute any representation by Landlord as to the exact layout or configuration of the Expansion Space. 
  

 EXHIBIT “A” 
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 EXHIBIT “B” 
 WORK LETTER AGREEMENT 
 This Work Letter Agreement (“Work Letter
Agreement”) sets forth the terms and conditions relating to the construction of improvements for the Expansion Space. All references in this Work Letter Agreement to “the First Amendment” shall mean the relevant portions of
the First Amendment to which this Work Letter Agreement is attached as Exhibit “B.” 
 SECTION 1 
 BASE, SHELL AND CORE 
 Landlord
has constructed, through its contractor, the base, shell and core of the Expansion Space and the Building (collectively, the “Base, Shell and Core”), and Tenant, subject to Section 11.1 of the Lease, shall accept the Base,
Shell and Core in its current “As-Is” condition existing as of the date of the First Amendment and the Expansion Commencement Date. Landlord shall install in the Expansion Space certain “Tenant Improvements” (as defined below)
pursuant to the provisions of this Work Letter Agreement. Except for the Tenant Improvement work described in this Work Letter Agreement and except for the Tenant Improvement Allowance set forth below, Landlord shall not be obligated to make or pay
for any alterations or improvements to the Expansion Space, the Building or the Project. 
 SECTION 2 
 TENANT IMPROVEMENTS 
 2.1
Tenant Improvement Allowance. Tenant shall be entitled to a one-time tenant improvement allowance (the “Tenant Improvement Allowance”) in the amount of up to, but not exceeding Sixty Dollars ($60.00) per usable square foot of
the Expansion Space (i.e., up to Four Hundred Twenty-Seven Thousand Eight Hundred Dollars ($427,800.00), based on 7,130 usable square feet of the Expansion Space (with the usable square feet of the Expansion Space modified for purposes of
calculating the Tenant Improvement Allowance and excludes, for this purpose, the usable square footage comprising the balconies and restrooms in the Premises (1,151 usable square feet in the aggregate)) (the “Tenant Improvements”).
In the event the costs of the Tenant Improvements exceed the Tenant Improvement Allowance, Tenant shall pay such amount to Landlord in cash, prior to construction of the Tenant Improvements. In no event shall Landlord be obligated to make
disbursements pursuant to this Work Letter Agreement in a total amount which exceeds the Tenant Improvement Allowance. Tenant shall not be entitled to receive any cash payment or credit against rent or otherwise for any portion of the Tenant
Improvement Allowance which is not used to pay for the Tenant Improvement Allowance Items (as such term is defined below). 
 2.2
Disbursement of the Tenant Improvement Allowance. Except as otherwise set forth in this Work Letter Agreement, the Tenant Improvement Allowance shall be disbursed by Landlord (each of which disbursement shall be made pursuant to
Landlord’s standard disbursement process), only for the Tenant Improvement Allowance Items described in Section 2.2 of the Work Letter Agreement to the Lease (which are incorporated herein by this reference). 
 2.3 Specifications for Building Standard Components. Section 2.3 of the Work Letter Agreement attached to the Lease shall apply to the design
and construction of Expansion Space. 
 SECTION 3 
 CONSTRUCTION DRAWINGS 
 3.1 Selection of Architect/Construction Drawings. Tenant shall
retain Augustine Design Group to prepare the Space Plan (the “Architect”) (with the commercially reasonable costs of the same to be an Allowance Item). Landlord shall retain engineering consultants selected by Landlord (the
“Engineers”) to prepare all plans and engineering working drawings relating to the structural, mechanical, electrical, plumbing, HVAC, lifesafety, and sprinkler work in the Expansion Space. The plans and drawings to be prepared by
Architect and the Engineers hereunder shall be known collectively as the “Construction Drawings.” The remaining terms of Section 3.1 of the Work Letter Agreement attached to the Lease are deemed incorporated herein by this
reference. 
  

 EXHIBIT “B” 
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 3.2 Final Space Plan. As soon as reasonably possible after the date of the First Amendment, Tenant
and Architect shall prepare the final space plan for Tenant Improvements in the Expansion Space (the “Final Space Plan”), which Final Space Plan shall include a layout and designation of all offices, rooms and other partitioning,
their intended use, and equipment to be contained therein, and shall deliver the Final Space Plan to Landlord for Landlord’s approval. 
 3.3 Final Working Drawings. Based on the Final Space Plan, Tenant shall cause the Architect and Landlord shall cause the Engineers to complete the architectural and engineering drawings for the Expansion Space, and Architect shall
compile a fully coordinated set of architectural, structural, mechanical, electrical and plumbing working drawings in a form which is complete to allow subcontractors to bid on the work and to obtain all applicable permits (collectively, the
“Final Working Drawings”) and shall submit the same concurrently (i) to Landlord for Landlord’s approval and (ii) on or before the date set forth therefor in Section 1 of Schedule 1, to the applicable local
governmental agency for all applicable building permits necessary to allow “Contractor,” as that term is defined in Section 4.1 of this Work Letter Agreement, to commence and fully complete the construction of the Tenant Improvements
(collectively, the “Permits”). Landlord shall approve or reasonably disapprove the Final Working Drawings or any revisions thereto within five (5) business days after Tenant delivers the Final Working Drawings or such revisions
to Landlord (and any delay by Landlord in so responding shall not be a Tenant Delay). This procedure shall be repeated until the Final Working Drawings are approved by Landlord. 
 3.4 Approved Working Drawings. The Final Working Drawings approved by Landlord pursuant to Section 3.3 above shall be referred to herein as
the “Approved Working Drawings”. In connection with the submittal for the Permits, Tenant shall coordinate with Landlord in order to allow Landlord, at Landlord’s option, to take part in all phases of the permitting process,
and shall supply Landlord, as soon as possible, with all plan check numbers and dates of submittal. Notwithstanding the foregoing, Tenant hereby agrees that neither Landlord nor Landlord’s consultants shall be responsible for obtaining any
building permit or certificate of occupancy for the Expansion Space and that the obtaining of the same shall be Tenant’s responsibility; provided, however, that Landlord shall, in any event, cooperate with Tenant in executing permit
applications and performing other ministerial acts reasonably necessary to enable Tenant to obtain any such permit or certificate of occupancy. No changes, modifications or alterations in the Approved Working Drawings may be made without the prior
written consent of Landlord, provided that Landlord may withhold its consent, in its sole discretion, to any change in the Approved Working Drawings, if such change would directly or indirectly delay the Substantial Completion of the Expansion
Space. 
 3.5 Time Deadlines. Tenant shall cooperate with Architect, the Engineers, and Landlord to complete all phases of the
Construction Drawings and the permitting process and to receive the Permits, and with Contractor, for approval of the “Cost Proposal,” as that term is defined in Section 4.2 below, in accordance with the dates set forth in
Schedule 1. Tenant shall meet with Landlord on a weekly (or such other basis as Landlord shall reasonably determine) to discuss Tenant’s progress in connection with the same. Certain of applicable dates for approval of items, plans and
drawings as described in this Section 3, Section 4, below, and in this Work Letter Agreement are set forth and further elaborated upon in Schedule 1 (the “Time Deadlines”), attached hereto. Tenant agrees to comply
with the Time Deadlines. 
 3.6 Change Orders. Section 3.6 of the Work Letter Agreement of the Lease (pertaining to change
orders) shall apply with respect to changes desired by Tenant to the Approved Working Drawings. 
 SECTION 4 
 CONSTRUCTION OF THE TENANT IMPROVEMENTS 
 4.1 Contractor. A contractor (“Contractor”), under the supervision of and selected by Landlord, shall construct the Tenant Improvements. The Tenant Improvements shall be constructed by the
Contractor in compliance with all applicable laws and in a good and workmanlike manner. 
  

 EXHIBIT “B” 
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 4.2 Cost Proposal. After the Approved Working Drawings are signed by Landlord and Tenant, Landlord
shall provide Tenant with a cost proposal in accordance with the Approved Working Drawings, which cost proposal shall include, as nearly as possible, the cost of all Tenant Improvement Allowance Items (including permits and architect fees and any
other fees such as construction management) to be incurred by Tenant in connection with the construction of the Tenant Improvements (the “Cost Proposal”). Tenant shall approve and deliver the Cost Proposal to Landlord within five
(5) business days of the receipt of the same. The date by which Tenant must approve and deliver the Cost Proposal shall be known hereafter as the “Cost Proposal Delivery Date”. 
 4.3 Construction of Tenant Improvements by Landlord’s Contractor under the Supervision of Landlord. 
 4.3.1 Over-Allowance Amount. On the Cost Proposal Delivery Date, Tenant shall deliver to Landlord cash in an amount (the
“Over-Allowance Amount”) equal to the difference between (i) the amount of the Cost Proposal and (ii) the amount of the Tenant Improvement Allowance (less any portion thereof already disbursed by Landlord, or in the
process of being disbursed by Landlord, on or before the Cost Proposal Delivery Date). The Over-Allowance Amount shall be disbursed by Landlord prior to the disbursement of any then remaining portion of the Tenant Improvement Allowance, and such
disbursement shall be pursuant to the same procedure as the Tenant Improvement Allowance. In the event that, after the Cost Proposal Date, any revisions, changes, or substitutions shall be made to the Construction Drawings or the Tenant
Improvements, any additional costs which arise in connection with such revisions, changes or substitutions shall be added to the Cost Proposal and shall be paid by Tenant to Landlord immediately upon Landlord’s request to the extent such
additional costs increase any existing Over-Allowance Amount or result in an Over-Allowance Amount. Following completion of the Tenant Improvements, Landlord shall deliver to Tenant a final cost statement which shall indicate the final costs of the
Tenant Improvement Allowance Items, and if such cost statement indicates that Tenant has underpaid or overpaid the Over-Allowance Amount, then within ten (10) business days after receipt of such statement, Tenant shall deliver to Landlord the
amount of such underpayment or Landlord shall return to Tenant the amount of such overpayment, as the case may be. 
 4.3.2
Landlord Supervision. Section 4.3.2 of the Work Letter Agreement (pertaining to Landlord’s Supervision Fee) to the Lease is deemed incorporated herein by this reference and such Landlord’s Supervision Fee shall comply to the
construction of the Tenant Improvements. 
 4.3.3 Contractor’s Warranties and Guaranties. Section 4.3.3 of
the Work Letter Agreement (pertaining to Construction Warranties and Guaranties) to the Lease is deemed incorporated herein by this reference. 
 SECTION 5 
 SUBSTANTIAL COMPLETION 
 5.1 Substantial Completion. For purposes of the First Amendment, including for purposes of determining the Expansion Commencement Date (as set
forth in Section 2.2 of the First Amendment), “Substantial Completion” of the Expansion Space shall occur upon the completion of construction of the Tenant Improvements in the Expansion Space pursuant to the Approved Working
Drawings, with the exception of any punchlist items and any tenant fixtures, work-stations, built-in furniture, or equipment to be installed by Tenant or under the supervision of Contractor. 
  

 EXHIBIT “B” 
 -3- 

 5.2 Tenant Delays. If there shall be a delay or there are delays in the Substantial Completion of
the Expansion Space (as a direct, indirect, partial, or total result of any of the following (collectively, “Tenant Delays”): 
 5.2.1 Tenant’s failure to timely approve any matter requiring Tenant’s approval, including the Cost Proposal and/or Tenant’s failure to timely perform any other obligation or act required of Tenant
hereunder; 
 5.2.2 a breach by Tenant of the terms of this Work Letter Agreement or the Lease (as modified by the First
Amendment); 
 5.2.3 Tenant’s request for changes in the Construction Drawings only to the extent such changes cause a
delay in the timelines; 
 5.2.4 Tenant’s requirement for materials, components, finishes or improvements which are not
available in a reasonable time (based upon the April 1, 2009 anticipated date of the Expansion Commencement Date) or which are different from, or not included in, the Specifications. In the event that items are not available, Landlord shall
provide notice to Tenant of such unavailability and give Tenant the ability to select alternative items; 
 5.2.5 changes to
the Base, Shell and Core required by the Approved Working Drawings only to the extent required by a specific use by Tenant that is not covered by the Lease; 
 5.2.6 any changes in the Construction Drawings and/or the Tenant Improvements required by applicable laws if such changes are directly
attributable to Tenant’s use of the Expansion Space or Tenant’s specialized tenant improvement(s) (as determined by Landlord); 
 5.2.7 Tenant’s failure to comply with the Time Deadline; or 
 5.2.8 any other acts or
omissions of Tenant, or its agents, or employees; 
 then, notwithstanding anything to the contrary set forth in the Lease and regardless of the actual date
of the Substantial Completion of the Expansion Space, the Expansion Commencement Date (as set forth in Section 2.2 of the First Amendment) shall be deemed to be the date the Expansion Commencement Date would have occurred if no Tenant Delays,
as set forth above, had occurred. 
 Notwithstanding anything above to the contrary, no Tenant Delay shall apply to any delays by the City of
San Diego or other governmental agency, in issuing permits beyond the period of time required to issue building permits for the Tenant Improvements where the delays were not directly related to an action or inactions of Tenant. 
 SECTION 6 
 MISCELLANEOUS

 Sections 6.1, 6.2, 6.3, 6.4 and 6.5 of the Work Letter Agreement attached to the Lease shall apply with full force and effect to
Landlord’s and Tenant’s obligations under this Work Letter Agreement. 
  

 EXHIBIT “B” 
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 SCHEDULE 1 
 TIME DEADLINES 
  

					
	  	 	 Dates
	  	 Actions to be Performed

			
	 1.
	 	 November 15, 2008
	  	Tenant to submit Approved Working Drawings to the City of San Diego for all applicable building permits.
			
	 2.
	 	 December 15, 2008
	  	Tenant to obtain all applicable building permits.
			
	 3.
	 	 Five (5) business days after the receipt of the Cost Proposal by Tenant.
	  	Tenant to approve Cost Proposal and deliver Cost Proposal to Landlord.

  

 SCHEDULE 1 
 -1-Registraton Rights Agreement

 Exhibit 4.5 
 REGISTRATION RIGHTS AGREEMENT 
 This REGISTRATION RIGHTS AGREEMENT, dated as of August 26, 2008,
is entered into by and among ADA-ES, a Colorado corporation (the “Company”) and the Persons whose names are set forth on the signature pages attached hereto (each a “Subscriber,” and together,
the “Subscribers”). 
 RECITAL 
 In connection with the sale by the Company of 909,092 shares of its Common Stock to accredited investors as set forth in the Subscription Agreements
dated as of August 26, 2008, entered into by and between the Company and the Subscribers thereto (the “Subscription Agreement”), the Company has agreed to provide the Subscribers with the rights set forth in this
Agreement. 
 AGREEMENT 
 NOW, THEREFORE, in consideration of the foregoing premises and the mutual covenants and agreements hereinafter contained, and for other good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, intending to be legally bound, the parties hereto hereby agree as follows: 
 ARTICLE 1 
 DEFINITIONS 
 “Affiliate” means any Person that directly or indirectly controls, or is under control with, or is controlled by such Person. As used in this definition, “control” (including with its correlative meanings,
“controlled by” and “under common control with”) shall mean the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of a Person (whether through ownership of securities
or partnership or other ownership interests, by contract or otherwise). 
 “Business Day” means any day excluding
Saturday, Sunday or any other day which is a legal holiday under the laws of the States of Colorado or New York or is a day on which banking institutions therein located are authorized or required by law or other governmental action to close.

 “Closing Date” means August 26, 2008. 
 “Common Stock” means the common stock, no par value per share, of the Company. 
 “Company” has the meaning set forth in the preamble. 
 “Designated Holder” means a holder of Registrable Securities. 
 “Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules and regulations of the SEC promulgated
thereunder. 
 “Indemnified Party” has the meaning set forth in Section 2.9. 
 “Losses” has the meaning set forth in Section 2.9. 
  

 1 

 “Majority Holders” means holders of a majority (by number of shares) of the
Registrable Securities. 
 “Person” means any individual, company, partnership, firm, joint venture, association,
joint-stock company, trust, unincorporated organization, governmental body or other entity. 
 “Piggyback
Registration” has the meaning set forth in Section 2.4. 
 “Registration Period” means the
one year, plus any additional periods required by the second paragraph of Section 2.1, during which the Registration Statement contemplated by Section 2.1 is required to remain effective. 
 “Registrable Securities” means, subject to the immediately following sentences, (i) shares of Common Stock acquired by the
applicable Subscriber from the Company pursuant to the Subscription Agreement and (ii) any shares of Common Stock issued or issuable, directly or indirectly, with respect to the securities referred to in clause (i) by way of stock dividend
or stock split or in connection with a combination of shares, recapitalization, merger, consolidation or other reorganization. In addition, any particular shares of Common Stock constituting Registrable Securities will cease to be Registrable
Securities when they (x) have been effectively registered under the Securities Act and disposed of in accordance with a Registration Statement covering them, (y) have been sold to the public pursuant to Rule 144 (or by similar provision
under the Securities Act), or (z) are eligible for resale under Rule 144(b)(1)(i) (or by similar provision under the Securities Act) without any limitation on the amount of securities that may be sold under paragraph (e) thereof or on the
manner of sale under paragraph (f) thereof. 
 “Registration Statement” means a registration statement on Form
S-3 (or, if the Company is not eligible to use Form S-3, such other appropriate registration form of the SEC pursuant to which the Company is eligible to register the resale of Registrable Securities) filed by the Company under the Securities Act
which covers any of the Registrable Securities pursuant to the provisions of this Agreement, including the prospectus, amendments and supplements to such registration statement, including post-effective amendments, all exhibits and all material
incorporated by reference in such registration statement, which shall permit the Designated Holders to offer and sell, on a delayed or continuous basis pursuant to Rule 415 under the Securities Act, the Registrable Securities. 
 “Representatives” has the meaning set forth in Section 2.9. 
 “Required Registration Statement” has the meaning set forth in Section 2.1. 
 “SEC” means the United States Securities and Exchange Commission or any other federal agency at the time administering the
Securities Act. 
 “Securities Act” means the Securities Act of 1933, as amended, and the rules and regulations of
the SEC promulgated thereunder. 
 “Subscriber(s)” has the meaning set forth in the preamble. 
 “Subscription Agreement” has the meaning set forth in the recitals. 
  

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 ARTICLE 2 
 REGISTRATION RIGHTS 
 2.1 Required Registration. The Company shall use its reasonable efforts to prepare and, not later than twenty (20) days from the Closing Date (or, if such 20th day is not a Business Day, by the first Business Day thereafter), file a Registration Statement with the SEC (the “Required Registration Statement”) and cause the Required Registration
Statement to be declared effective under the Securities Act within 120 days after the Closing Date (or, if such 120th day is not a Business Day, by
the first Business Day thereafter). The Company agrees to include in the Required Registration Statement all information which the Designated Holders shall reasonably request and as may be permitted by applicable law. If the Required Registration
Statement is not declared effective under the Securities Act within 120 days after the Closing Date (or, if such 120th day is not a Business Day, by the first Business Day thereafter), other than due to failure by a Designated Holder to furnish
information required (as determined by the Company after consultation with counsel) to be included in such Required Registration Statement or a force majeure event described in Section 4.17, the Company shall pay each Designated Holder in cash
an amount per month equal to one percent (1%) of the amount paid by such Designated Holder for the Registrable Securities pursuant to the Subscription Agreement, which shall be the Designated Holders’ sole remedy for such failure; provided
that the maximum amount payable to a Designated Holder shall not exceed twelve percent (12%) of the amount paid by such Designated Holder under its Subscription Agreement. 
 The Company shall use its reasonable efforts to keep the Required Registration Statement continuously effective for a period of one year after the
Registration Statement first becomes effective, plus the number of days during which such Registration Statement was not effective or usable pursuant to Sections 2.5(b), 2.6(e) or 2.6(i) hereof, or such shorter period as will
terminate when all of the Registrable Securities covered by the Required Registration Statement have been disposed of in accordance with the Required Registration Statement or have otherwise ceased to be Registrable Securities. In the event the
Company shall give any notice pursuant to Sections 2.6(e) or (i) hereof, the additional time period mentioned in this Section 2.1 during which the Required Registration Statement is to remain effective shall be
extended by the number of days during the period from and including the date of the giving of such notice pursuant to Sections 2.6(e) or (i) to and including the date when each seller of a Registrable Security covered by the
Registration Statement shall have received the copies of the supplemented or amended prospectus contemplated by Sections 2.6(e). 
 The Company may include in any registration filed pursuant to this Section 2.1, such additional securities as it may be obligated to include pursuant to any contractual obligations entered into by the Company, and, subject to any
restrictions contained elsewhere in this Agreement, such securities as the Company may elect to register for its own account. 
 2.2
Current Public Information. The Company covenants that it will use its reasonable efforts to file all reports required to be filed by it under the Exchange Act and the rules and regulations adopted by the SEC thereunder, and will use its
reasonable efforts to take such further action as the Designated Holders may reasonably request, all to the extent required to enable the holders of Registrable Securities to sell Registrable Securities pursuant to Rule 144 or Rule 144A adopted by
the SEC under the Securities Act or any similar rule or regulation hereafter adopted by the SEC. The Company shall, upon the request of a Designated Holder, deliver to such Designated Holder a written statement as to whether it has complied with
such requirements during the twelve month period immediately preceding the date of such request. 
  

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 2.3 Demand Registration. 
 (a) Subject to Section 2.3(g), upon the written request of the Majority Holders requesting that the Company effect the
registration under the Securities Act of all or part of such Designated Holders’ Registrable Securities and specifying the intended method of disposition thereof, the Company will promptly give written notice of such requested registration to
all Designated Holders, and thereafter the Company will use its reasonable efforts to effect as expeditiously as possible the registration under the Securities Act of the following: 
 (i) the Registrable Securities which the Company has been so requested to be registered by such Designated Holders for disposition in
accordance with the intended method of disposition stated in such request; 
 (ii) all other Registrable Securities the
holders of which shall have made a written request to the Company for registration thereof within 30 days after the giving of such written notice by the Company (which request shall specify the intended method of disposition of such Registrable
Securities); and 
 (iii) all shares of Common Stock which the Company or Persons entitled to exercise “piggy-back”
registration rights pursuant to contractual commitments of the Company may elect to register in connection with the offering of Registrable Securities pursuant to this Section 2.3 or otherwise; 
 all to the extent requisite to permit the disposition (in accordance with the intended methods thereof as aforesaid) of the Registrable Securities and the additional
shares of Common Stock, if any, so to be registered; provided, that, the provisions of this Section 2.3 shall not require the Company to effect more than one registration of Registrable Securities in addition to the Required Registration
Statement contemplated by Section 2.1. 
 (b) The registrations under this Section 2.3 shall be on an
appropriate form for a Registration Statement that permits the disposition of such Registrable Securities in accordance with the intended methods of distribution specified by the Majority Holders in their request for registration. The Company agrees
to include in any such Registration Statement all information which Designated Holders of Registrable Securities being registered therein shall reasonably request so as to allow them to sell their Registrable Securities by the method of distribution
selected by them. 
 (c) A registration requested pursuant to this Section 2.3 shall not be deemed to have been
effected (i) unless a Registration Statement with respect thereto has become effective; provided, that a Registration Statement which does not become effective after the Company has filed a Registration Statement with respect thereto solely by
reason of the refusal to proceed of the Majority Holders (other than a refusal to proceed based upon the advice of counsel relating to a matter with respect to the Company) shall be deemed to have been effected by the Company at the request of the
Majority Holders unless the Designated Holders electing to have Registrable Securities registered pursuant to such Registration Statement shall have elected to pay all fees and expenses otherwise payable by the Company in connection with such
registration pursuant to Section 2.8, (ii) if, after it has become effective, such registration is withdrawn by the Company (other than at the request of the Majority Holders) or interfered with by any stop order, injunction or
other order or requirement of the SEC or other governmental agency or court for any reason prior to the expiration of a 180 day period following such Registration Statement’s effectiveness, or (iii) if the conditions to closing specified
in any purchase agreement or underwriting agreement entered into in connection with such registration are not satisfied, other than due solely to some act or omission by the Designated Holders electing to have Registrable Securities registered
pursuant to such Registration Statement. 
  

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 (d) If a requested registration pursuant to this Section 2.3 involves an
underwritten offering, the underwriter or underwriters thereof shall be selected by the holders of a majority (by number of shares) of the Registrable Securities requested to be included in such Registration Statement and shall be reasonably
acceptable to the Company in its sole discretion. 
 (e) If a requested registration pursuant to this Section 2.3
involves an underwritten offering, and the managing underwriter shall advise the Company that, in its opinion, the number of securities requested to be included in such registration (including securities of the Company or any other Person which are
not Registrable Securities) exceeds the number which can be sold in such offering in an orderly manner within a price range reasonably acceptable to the Company and to the holders of a majority (by number of shares) of the Registrable Securities
requested to be included in such Registration Statement, the Company will include in such registration, to the extent of the number which the Company is so advised can be sold in such offering, (i) first, any shares of Common Stock or other
securities as to which the Company has granted registration rights prior to the date of this Agreement which by their terms require priority over the rights granted under this Section 2.3, (ii) second, the Registrable Securities which have
been requested to be included in such registration by the Designated Holders pursuant to this Agreement (pro rata based on the amount of Registrable Securities sought to be registered by such persons), (iii) third, provided that no securities
sought to be included by the Designated Holders have been excluded from such registration, the securities of other persons entitled to exercise “piggy-back” registration rights pursuant to other contractual commitments of the Company (pro
rata based on the amount of securities sought to be registered by such persons) and (iv) fourth, securities the Company proposes to register for its own account. 
 (f) The Company shall use its reasonable efforts to keep any Registration Statement filed pursuant to this Section 2.3
continuously effective (i) for a period of one year after the Registration Statement first becomes effective, plus the number of days during which such Registration Statement was not effective or usable pursuant to Sections 2.5(b),
2.6(e) or 2.6(i); (ii) if such Registration Statement related to an underwritten offering, for such period as in the opinion of counsel for the underwriters a prospectus is required by law to be delivered in connection with sales
of Registrable Securities by an underwriter or dealer, or (iii) for such shorter period as will terminate when all of the Registrable Securities covered by the Required Registration Statement have been disposed of in accordance with the
Required Registration Statement or have otherwise ceased to be Registrable Securities. In the event the Company shall give any notice pursuant to Sections 2.6(e) or (i), the additional time period mentioned in
Section 2.3(f)(i) during which the Required Registration Statement is to remain effective shall be extended by the number of days during the period from and including the date of the giving of such notice pursuant to
Sections 2.6(e) or (i) to and including the date when each seller of a Registrable Security covered by the Registration Statement shall have received the copies of the supplemented or amended prospectus contemplated by
Sections 2.6(e). 
 (g) The right of Designated Holders to have Registrable Securities registered pursuant to this
Section 2.3 is only exercisable following the expiration of the Registration Period or, if, prior to the expiration of the Registration Period, the Company becomes ineligible to register the Registrable Securities on the Registration
Statement contemplated by Section 2.1 or such Registration Statement otherwise becomes unusable or ineffective and the Company is not able to correct the misstatements, have the applicable stop order rescinded or otherwise restore the
effectiveness of the Registration Statement as contemplated by this Agreement. 
  

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 2.4 Piggyback Registration. 
 (a) Whenever the Company proposes to register any of its common stock under the Securities Act (other than pursuant to a registration
pursuant to Section 2.1 or Section 2.3, a registration on Form S-4 or S-8 or any successor or similar forms or a registration of shares in connection with an acquisition) and the registration form to be used may be used for the
registration of Registrable Securities, whether or not for sale for its own account, the Company will give prompt written notice to all Designated Holders, and such notice shall describe the proposed registration and distribution and offer to all
Designated Holders the opportunity to register the number of Registrable Securities as each such Designated Holder may request. The Company will include in such registration statement all Registrable Securities with respect to which the Company has
received written requests for inclusion therein within 15 days after the Designated Holders’ receipt of the Company’s notice (a “Piggyback Registration”). 
 (b) The Company shall use its reasonable efforts to cause the managing underwriter or underwriters of a proposed underwritten offering to
permit the Registrable Securities requested to be included in a Piggyback Registration to be included on the same terms and conditions as any similar securities of the Company or any other security holder included therein and to permit the sale or
other disposition of such Registrable Securities in accordance with the intended method of distribution thereof. 
 (c) Any
Designated Holder shall have the right to withdraw its request for inclusion of its Registrable Securities in any Registration Statement pursuant to this Section 2.4 by giving written notice to the Company of its request to withdraw;
provided, that in the event of such withdrawal (other than pursuant to Section 2.4(e) hereof), the Company shall not be required to reimburse such holder for the fees and expenses referred to in Section 2.8 hereof incurred by
such Designated Holder prior to such withdrawal, unless such withdrawal was due to a material adverse change to the Company. The Company may withdraw a Piggyback Registration at any time prior to the time it becomes effective. 
 (d) If (i) a Piggyback Registration involves an underwritten offering of the securities being registered, whether or not for sale for
the account of the Company, to be distributed (on a firm commitment basis) by or through one or more underwriters of recognized standing under underwriting terms appropriate for such a transaction, and (ii) the managing underwriter of such
underwritten offering shall advise the Company that, in its opinion, the number of securities requested to be included in such offering (including securities of the Company or any other Person which are not Registrable Securities) exceeds the number
which can be sold in such offering in an orderly manner within a price range reasonably acceptable to the Company and, if registration of such offering is pursuant to a contractual commitment of the Company to holders of its securities, holders of a
majority (by number of shares) of such securities, then the Company will be required to include in such registration only the amount of securities which it is so advised should be included in such registration. In such event: (x) in cases
initially involving the registration for sale of securities for the Company’s own account, securities shall be registered in such offering in the following order of priority: (i) first, the securities which the Company proposes to
register, (ii) second, any shares of Common Stock or other securities as to which the Company has granted registration rights prior to the date of this Agreement which by their terms require priority over the rights granted under this
Section 2.4, (iii) third, Registrable Securities and securities which have been requested to be included in such registration by other Persons entitled to exercise “piggy-back” registration rights pursuant to contractual
commitments of the Company (pro rata based on the amount of securities sought to be registered by Designated Holders and such other Persons); and (y) in cases not initially involving the registration for sale of securities for 

  

 6 

 
the Company’s own account, securities shall be registered in such offering in the following order of priority: (i) first, the securities of any
Person whose exercise of a “demand” registration right pursuant to a contractual commitment of the Company is the basis for the registration, (ii) second, Registrable Securities and securities which have been requested to be included
in such registration by Persons entitled to exercise “piggy-back” registration rights pursuant to contractual commitments of the Company (pro rata based on the amount of securities sought to be registered by Designated Holders and such
other Persons), and (iii) third, the securities which the Company proposes to register for its own account. 
 (e) If, as
a result of the proration provisions of this Section 2.4, any Designated Holders shall not be entitled to include all Registrable Securities in a Piggyback Registration that such Designated Holders has requested to be included, such
holder may elect to withdraw its request to include Registrable Securities in such registration. 
 (f) The right of the
Designated Holders to register Registrable Securities pursuant to this Section 2.4 is only exercisable with respect to Registrable Securities not then covered by an effective Registration Statement contemplated by Section 2.1
or Section 2.3. The rights of the Designated Holders under this Section 2.4 shall survive the expiration of the Registration Period. 
 2.5 Holdback Agreements. 
 (a) To the extent not inconsistent with applicable law,
upon the request of the Company or the underwriter, in the case of an underwritten public offering of the Company’s securities other than in connection with the registration contemplated by Section 2.1, each Designated Holder will not
effect any public sale or distribution (other than those included in the registration statement being filed with respect to such public offering) of any securities of the Company, or any securities, options or rights convertible into or exchangeable
or exercisable for such securities during the 14 days prior to and the 90-day period beginning on such effective date (or such other period as may be requested by the Company or an underwriter to accommodate regulatory restrictions on (i) the
publication or other distribution of research reports and (ii) analyst recommendations and opinions, including, but not limited to, the restrictions contained in NASD Rule 2711(f)(4) or NYSE Rule 472(f)(4), or any successor provisions or
amendments thereto), unless (in the case of an underwritten public offering) the managing underwriters otherwise agree to a shorter period of time. Notwithstanding the foregoing, no Designated Holder shall be required to enter into any such
“lock up” agreement unless and until all of the Company’s executive officers and directors execute substantially similar “lock up” agreements. Neither the Company nor the underwriter shall amend, terminate or waive a
“lock up” agreement unless each “lock up” agreement with a Designated Holder is also amended or waived in a similar manner or terminated, as the case may be. 
 (b) The Company shall have the right at any time, to suspend the filing of a Registration Statement under Section 2.3 or
require that the Designated Holders of Registrable Securities suspend further open market offers and sales of Registrable Securities pursuant to a Registration Statement filed hereunder for a period not to exceed an aggregate of 75 days in any
twelve-month period for valid business reasons (not including avoidance of their obligations hereunder) (i) to avoid premature public disclosure of a pending corporate transaction, including pending acquisitions or divestitures of assets,
mergers and combinations and similar events; and (ii) upon the occurrence of any of the events specified in Sections 2.6(e) or (i). 
  

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 2.6 Registration Procedures. The Company will use its reasonable efforts to effect the
registration of Registrable Securities pursuant to this Agreement in accordance with the intended methods of disposition thereof, and pursuant thereto the Company will as expeditiously as possible: 
 (a) before filing the Registration Statement, the Company will furnish to counsel of any holder of Registrable Securities (assuming the
Company has been timely notified as to the identity and contact information for such counsel), a copy of such Registration Statement, and will provided such counsel with all correspondence with the SEC regarding the Registration Statement;

 (b) prepare and file with the SEC such amendments and supplements to such Registration Statement and the prospectus used in
connection therewith as may be necessary to keep such Registration Statement effective for the period provided for in Section 2.1 or Section 2.3, or the periods contemplated by the Company or the Persons requesting any
Registration Statement filed pursuant to Section 2.4; 
 (c) furnish to each seller of Registrable Securities
included in the Registration Statement such number of copies of such Registration Statement, each amendment and supplement thereto, the prospectus included in the Registration Statement (including each preliminary prospectus) and such other
documents as such seller may reasonably request in order to facilitate the disposition of the Registrable Securities owned by such seller; 
 (d) use its reasonable efforts to register or qualify such Registrable Securities under such state securities or blue sky laws as any Designated Holder reasonably requests, and do any and all other acts and things
which may be reasonably necessary or advisable to enable such seller to consummate the disposition in such jurisdictions of the Registrable Securities owned by such seller and to keep each such registration or qualification (or exemption therefrom)
effective during the period which the Registration Statement is required to be kept effective (provided, that the Company will not be required to (i) qualify generally to do business in any jurisdiction where it would not otherwise be required
to qualify but for this subparagraph, (ii) subject itself to taxation in any such jurisdiction, (iii) consent to general service of process in any such jurisdiction or (iv) attempt to register or qualify securities for sale in any
jurisdiction in which counsel for the Company has advised the Company that such registration or qualification would be likely to be unavailable absent unreasonable effort or expense); 
 (e) notify each seller of such Registrable Securities, at any time when a prospectus relating thereto is required to be delivered under
the Securities Act, of the happening of any event as a result of which the prospectus included in the Registration Statement contains an untrue statement of a material fact or omits any fact necessary to make the statements therein not misleading in
the light of the circumstances under which they were made, and, at the request of any such seller, the Company will as soon as possible prepare and furnish to such seller a reasonable number of copies of a supplement or amendment to such prospectus
so that, as thereafter delivered to the purchasers of such Registrable Securities, such prospectus will not contain an untrue statement of a material fact or omit to state any fact necessary to make the statements therein not misleading in the light
of the circumstances under which they were made; 
 (f) cause all such Registrable Securities to be listed on each securities
exchange on which similar securities issued by the Company are then listed and, if not so listed, to be approved for trading on any automated quotation system of a national securities association on which similar securities of the Company are
quoted; 
  

 8 

 (g) provide a transfer agent and registrar for all such Registrable Securities not later
than the effective date of such Registration Statement; 
 (h) enter into such customary agreements (including underwriting
agreements) and take all other customary and appropriate actions as the holders of a majority of the Registrable Securities being registered or the underwriters, if any, reasonably request in order to expedite or facilitate the disposition of such
Registrable Securities; 
 (i) notify each Designated Holder of any stop order issued or threatened by the SEC; 
 (j) otherwise comply with all applicable rules and regulations of the SEC, and make available to its security holders, as soon as
reasonably practicable, an earnings statement covering the period of at least twelve months beginning with the first day of the Company’s first full calendar quarter after the effective date of the Registration Statement, which earnings
statement shall satisfy the provisions of Section 11(a) of the Securities Act and Rule 158 thereunder; 
 (k) in the
event of the issuance of any stop order suspending the effectiveness of a Registration Statement, or of any order suspending or preventing the use of any related prospectus or suspending the qualification of any securities included in such
Registration Statement for sale in any jurisdiction, the Company will use its reasonable efforts to promptly obtain the withdrawal of such order; 
 (l) if requested by a Designated Holder, obtain one or more comfort letters, dated the effective date of the Registration Statement (and, if such registration includes an underwritten offering, dated the date of the
closing under the underwriting agreement), signed by the Company’s independent public accountants in customary form and covering such matter of the type customarily covered by such accountant comfort letters as the Majority Holders of the
Registrable Securities being sold under the Registration Statement shall reasonably request; 
 (m) provide a legal opinion of
the Company’s outside counsel, dated the effective date of such Registration Statement (and, if such registration includes an underwritten offering, dated the date of the closing under the underwriting agreement), with respect to the
Registration Statement, each amendment and supplement thereto, the prospectus included therein (including the preliminary prospectus) and such other documents relating thereto in customary form and covering such matters of the type customarily
covered by legal opinions of such nature; 
 (n) subject to execution and delivery of mutually satisfactory confidentiality
agreements, make available at reasonable times for inspection by any seller of Registrable Securities, any managing underwriter participating in any disposition of such Registrable Securities pursuant to the Registration Statement, and any attorney,
accountant or other agent retained by such seller or any managing underwriter, during normal business hours of the Company at the Company’s corporate office in Littleton, Colorado and without unreasonable disruption of the Company’s
business or unreasonable expense to the Company and solely for the purpose of due diligence with respect to the Registration Statement, legally disclosable, financial and other records and pertinent corporate documents of the Company and its
subsidiaries reasonably requested by such persons, and cause the Company’s employees and independent accountants to supply all similar information reasonably requested by any such seller, managing underwriter, attorney, accountant or agent in
connection with the Registration Statement, as shall be reasonably necessary to enable them to exercise their due diligence responsibility under applicable securities laws; 
  

 9 

 (o) cooperate with each seller of Registrable Securities and each underwriter
participating in the disposition of such Registrable Securities and their respective counsel in connection with any filings required to be made with the National Association of Securities Dealers; and 
 (p) take all other steps reasonably necessary to effect the registration of the Registrable Securities contemplated hereby. 
 2.7 Conditions Precedent to Company’s Obligations Pursuant to this Agreement. It shall be a condition precedent to the obligations of the
Company to take any action pursuant to this Agreement that each of the Designated Holders whose Registrable Securities are to be registered pursuant to this Agreement shall furnish such Designated Holder’s written agreement to be bound by the
terms and conditions of this Agreement prior to performance by the Company of its obligations under this Agreement. By executing and delivering this Agreement, each Designated Holder represents and warrants that the information concerning, and
representations and warranties by, such Designated Holder, including information concerning the securities of the Company held, beneficially or of record, by such Designated Holder, furnished to the Company pursuant to the Subscription Agreement or
otherwise, are true and correct as if the same were represented and warranted on the date any Registration Statement required pursuant to this Agreement is filed with the SEC or the date of filing with the SEC of any amendment thereto, and each
Designated Holder covenants to immediately notify the Company in writing of any change in any such information, representation or warranty and to refrain from offering or disposing of any securities pursuant to any Registration Statement until the
Company has reflected such change in such Registration Statement. By executing and delivering this Agreement, each Designated Holder further agrees to furnish any additional information as the Company may reasonably request in connection with any
action to be taken by the Company pursuant to this Agreement, and to pay such Designated Holder’s expenses which are not required to be paid by the Company pursuant to this Agreement. 
 2.8 Fees and Expenses. All expenses incident to the Company’s performance of or compliance with this Agreement including, without limitation,
all registration and filing fees payable by the Company, fees and expenses of compliance by the Company with securities or blue sky laws, printing expenses of the Company, messenger and delivery expenses of the Company, and fees and disbursements of
counsel for the Company and all independent certified public accountants of the Company, and other Persons retained by the Company will be borne by the Company, and the Company will pay its internal expenses (including, without limitation, all
salaries and expenses of the Company’s employees performing legal or accounting duties), the expense of any annual audit or quarterly review, the expense of any liability insurance of the Company and the expenses and fees for listing or
approval for trading of the securities to be registered on each securities exchange on which similar securities issued by the Company are then listed or on any automated quotation system of a national securities association on which similar
securities of the Company are quoted. In connection with any Registration Statement filed hereunder, the Company will pay the reasonable fees and expenses of a single counsel retained by the Designated Holders of a majority (by number of shares) of
the Registrable Securities requested to be included in such Registration Statement. The Company shall have no obligation to pay any underwriting discounts or commissions attributable to the sale of Registrable Securities and any of the expenses
incurred by any Designated Holder which are not specifically payable by the Company as described above, such costs to be borne by such Designated Holder or Holders, including, without limitation, the following: underwriting fees, discounts and
expenses, if any, applicable to any Designated Holder’s Registrable Securities; fees and disbursements of counsel or other professionals that any Designated Holder may choose to retain in connection with a Registration Statement filed pursuant
to this Agreement (except as otherwise provided herein); selling commissions or stock transfer taxes applicable to the Registrable Securities registered on behalf of any Designated Holder; any other expenses incurred by or on behalf of such
Designated Holder in connection with the offer and sale of such Designated Holder’s Registrable Securities other than expenses which the Company is expressly obligated to pay pursuant to this Agreement. 
  

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 2.9 Indemnification. 
 (a) The Company agrees to indemnify and hold harmless, to the fullest extent permitted by law, each Designated Holder and its general or
limited partners, officers, directors, members, managers, employees, advisors, representatives, agents and Affiliates (collectively, the “Representatives”) from and against any loss, claim, damage, liability, attorney’s
fees, cost or expense and costs and expenses of investigating and defending any such claim (collectively, the “Losses”), joint or several, and any action in respect thereof to which such Designated Holder or its
Representatives may become subject under the Securities Act or otherwise, insofar as such Losses (or actions or proceedings, whether commenced or threatened, in respect thereto) arise out of or are based upon (i) any breach by the Company of
any of its representations, warranties or covenants contained in this Agreement, (ii) any untrue or alleged untrue statement of a material fact contained in any Registration Statement, prospectus or preliminary or summary prospectus or any
amendment or supplement thereto or (iii) 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, and the Company shall reimburse each such
Designated Holder and its Representatives for any legal or any other expenses incurred by them in connection with investigating or defending or preparing to defend against any such Loss, action or proceeding; provided, however, that the Company
shall not be liable to any such Designated Holder or other indemnitee in any such case to the extent that any such Loss (or action or proceeding, whether commenced or threatened, in respect thereof) arises out of or is based upon (x) an untrue
statement or alleged untrue statement or omission or alleged omission, made in such Registration Statement, any such prospectus or preliminary or summary prospectus or any amendment or supplement thereto, in reliance upon, and in conformity with,
written information prepared and furnished to the Company by any Designated Holder or its Representatives expressly for use therein and, with respect to any untrue statement or omission or alleged untrue statement or omission made in any preliminary
prospectus relating to the Registration Statement, to the extent that a prospectus relating to the Registrable Securities was required to be delivered by such Designated Holder under the Securities Act in connection with such purchase, there was not
sent or given to such person, at or prior to the written confirmation of the sale of such Registrable Securities to such person, a copy of the final prospectus that corrects such untrue statement or alleged untrue statement or omission or alleged
omission if the Company had previously furnished copies thereof to such Designated Holder or (y) use of a Registration Statement or the related prospectus during a period when a stop order has been issued in respect of such Registration
Statement or any proceedings for that purpose have been initiated or use of a prospectus when use of such prospectus has been suspended pursuant to Sections 2.5(b), 2.6(e) or (i); provided that in each case, that such Holder was sent
prior written notice of such stop order, initiation of proceedings or suspension from the Company. In no event, however, shall the Company be liable for indirect, incidental or consequential or special damages of any kind, even if the Company was
aware of or specifically advised as to the possibility of such damages. In connection with an underwritten offering, the Company will indemnify such underwriters, their officers and directors and each Person who controls such underwriters (within
the meaning of the Securities Act) to the same extent as provided above with respect to the indemnification of the Designated Holders. 
 (b) In connection with the filing of the Registration Statement by the Company pursuant to this Agreement, the Designated Holders will furnish to the Company in writing such information as the Company reasonably
requests for use in connection with such Registration Statement and the related prospectus and, to the fullest extent permitted by law, each such Designated Holder 

  

 11 

 
will indemnify and hold harmless the Company and its Representatives from and against any Losses, severally but not jointly, and any action in respect
thereof to which the Company and its Representatives may become subject under the Securities Act or otherwise, insofar as such Losses (or actions or proceedings, whether commenced or threatened, in respect thereof) arise out of or are based upon
(i) the purchase or sale of Registrable Securities during a suspension as set forth in Sections 2.5(b), 2.6(e) or 2.6(i) hereof, in each case after written notice of such suspension was sent to the Designated Holder,
(ii) any untrue or alleged untrue statement of a material fact contained in the Registration Statement, prospectus or preliminary or summary prospectus or any amendment or supplement thereto, or (iii) any omission or alleged omission of a
material fact required to be stated therein or necessary to make the statements therein not misleading, but, with respect to clauses (ii) and (iii) above, only to the extent that such untrue statement or omission is made in such
Registration Statement, any such prospectus or preliminary or summary prospectus or any amendment or supplement thereto, in reliance upon and in conformity with written information prepared and furnished to the Company by such Designated Holder
expressly for use therein or by failure of such Designated Holder to deliver a copy of the Registration Statement or prospectus or any amendments or supplements thereto, and such Designated Holder will reimburse the Company and each Representative
for any legal or any other expenses incurred by them in connection with investigating or defending or preparing to defend against any such Loss, action or proceeding; provided, however, that such Designated Holder shall not be liable in any such
case to the extent that prior to the filing of any such Registration Statement or prospectus or amendment or supplement thereto, such Designated Holder has furnished in writing to the Company information expressly for use in such Registration
Statement or prospectus or any amendment or supplement thereto which corrected or made not misleading information previously furnished to the Company. In no event, however, shall any Designated Holder be liable for indirect, incidental or
consequential or special damages of any kind, even if the Designated Holder was aware of or specifically advised as to the possibility of such damages. 
 (c) Promptly after receipt by any Person in respect of which indemnity may be sought pursuant to Section 2.9(a) or 2.9(b) (an “Indemnified Party”) of notice of any claim or
the commencement of any action, the Indemnified Party shall, if a claim in respect thereof is to be made against the Person against whom such indemnity may be sought (an “Indemnifying Party”), promptly notify the Indemnifying
Party in writing of the claim or the commencement of such action; provided, that the failure to so notify the Indemnifying Party shall not relieve the Indemnifying Party from any liability which it may have to an Indemnified Party under
Section 2.9(a) or 2.9(b) except to the extent of any actual prejudice resulting therefrom. If any such claim or action shall be brought against an Indemnified Party, and it shall notify the Indemnifying Party thereof, the
Indemnifying Party shall be entitled to participate therein, and, to the extent that it wishes, jointly with any other similarly notified Indemnifying Party, to assume the defense thereof with counsel reasonably satisfactory to the Indemnified
Party. After notice from the Indemnifying Party to the Indemnified Party of its election to assume the defense of such claim or action, the Indemnifying Party shall not be liable to the Indemnified Party for any legal or other expenses subsequently
incurred by the Indemnified Party in connection with the defense thereof other than reasonable costs of investigation; provided, that the Indemnified Party shall have the right to employ separate counsel to represent the Indemnified Party and its
Representatives who may be subject to liability arising out of any claim in respect of which indemnity may be sought by the Indemnified Party against the Indemnifying Party, but the fees and expenses of such counsel shall be for the account of and
shall be paid by such Indemnified Party unless (i) the Indemnifying Party and the Indemnified Party shall have mutually agreed to the retention of such counsel or (ii) in the written opinion of counsel to such Indemnified Party,
representation of both parties by the same counsel would be inappropriate due to actual or potential conflicts of interest between them, it being understood, however, that the Indemnifying Party shall not, in connection with any one such claim or
action or separate but substantially similar or related claims or actions in the same jurisdiction 

  

 12 

 
arising out of the same general allegations or circumstances, be liable for the fees and expenses of more than one separate firm of attorneys (together with
appropriate local counsel) at any time for all Indemnified Parties. No Indemnifying Party shall, without the prior written consent of the Indemnified Party, effect any settlement of any claim or pending or threatened proceeding in respect of which
the Indemnified Party is or could have been a party and indemnity could have been sought hereunder by such Indemnified Party, unless such settlement includes an unconditional release of such Indemnified Party from all liability arising out of such
claim or proceeding other than the payment of monetary damages by the Indemnifying Party on behalf of the Indemnified Party. Whether or not the defense of any claim or action is assumed by the Indemnifying Party, such Indemnifying Party will not be
subject to any liability for any settlement made without its consent, which consent will not be unreasonably withheld. 
 (d)
If the indemnification provided for in this Section 2.9 is unavailable to the Indemnified Parties in respect of any Losses referred to herein, then each 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 Losses in such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and the Designated Holders 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 on the one hand and the
Designated Holders on the other in connection with the statements or omissions which resulted in such Losses, as well as any other relevant equitable considerations. The relative fault of the Company on the one hand and of each Designated Holder on
the other shall be determined by reference to, among other things, whether any action taken, including any untrue or alleged untrue statement of a material fact, or the omission or alleged omission to state a material fact relates to information
supplied by such party, and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. 
 The Company and the Designated Holders agree that it would not be just and equitable if contribution pursuant to this Section 2.9(d) were determined by pro rata allocation or by any other method of allocation which 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 Losses referred to in the immediately preceding paragraph shall be deemed to include,
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 2.9, no Designated Holder shall be required to contribute any amount in excess of the amount by which the total price at which the Registrable Securities of such Designated Holder were offered to the public. No Person guilty of
fraudulent misrepresentation (within the meaning of Section 11 (f) of the Securities Act) shall be entitled to contribution from any Person who was not guilty of such fraudulent misrepresentation. Each Designated Holder’s obligations
to contribute pursuant to this Section 2.9 is several in the proportion that the proceeds of the offering received by such Designated Holder bears to the total proceeds of the offering received by all the Designated Holders. The
indemnification provided by this Section 2.9 shall be a continuing right to indemnification with respect to sales of Registrable Securities and shall survive the registration and sale of any Registrable Securities by any Designated
Holder and the expiration or termination of this Agreement. The indemnity and contribution agreements contained herein are in addition to any liability that any Indemnifying Party might have to any Indemnified Party. 
  

 13 

 2.10 Participation in Registrations. 
 (a) No Person may participate in any registration hereunder which is underwritten unless such Person (i) agrees to sell such
Person’s securities on the basis provided in any underwriting arrangements approved by the Person or Persons entitled hereunder to approve such arrangements and (ii) completes and executes all questionnaires, powers of attorney,
indemnities, underwriting agreements and other documents reasonably required under the terms of such underwriting arrangements and this Agreement. 
 (b) Each Person that is participating in any registration under this Agreement agrees that, upon receipt of any notice from the Company of the happening of any event of the kind described in Section 2.6(e)
or (i) above, such Person will forthwith discontinue any further disposition of its Registrable Securities pursuant to the Registration Statement and all use of the Registration Statement or any prospectus or related document until such
Person receives copies of a supplemented or amended prospectus as contemplated by such Section 2.6(e) and, if so directed by the Company, will deliver to the Company (at the Company’s expense) all copies, other than permanent file
copies then in such Designated Holder’s possession, of such documents at the time of receipt of such notice. Furthermore, each Designated Holder agrees that if such Designated Holder uses a prospectus in connection with the offering and sale of
any of the Registrable Securities, the Designated Holder will use only the latest version of such prospectus provided by Company. 
 ARTICLE 3 
 TRANSFERS OF CERTAIN RIGHTS 
 3.1 Transfer. The rights granted to the Designated Holders under this Agreement may be transferred to (i) a person or entity which is an
Affiliate of the transferor, or (ii) any transferee of at least 100,000 Registrable Securities; provided, however, that any such transfer, in any case, shall be subject to the provisions of Sections 3.2 and 3.3; provided that
nothing contained herein shall be deemed to permit an assignment, transfer or disposition of the rights hereunder separate and apart from the Registrable Securities in violation of the terms and conditions of the Subscription Agreement or applicable
law. 
 3.2 Transferees. Any permitted transferee to whom rights under this Agreement are transferred shall, as a condition to such
transfer, deliver to the Company a written instrument by which such transferee agrees to be bound by the obligations imposed upon the Designated Holder under this Agreement to the same extent as if such transferee were a Subscriber hereunder.

 3.3 Subsequent Transferees. A transferee to whom rights are transferred pursuant to this Section 3 may not again
transfer such rights to any other person or entity, other than as provided in Sections 3.1 or 3.2 above. 
 ARTICLE 4 

 MISCELLANEOUS 
 4.1 Recapitalizations, Exchanges, etc. The provisions of this Agreement shall apply to the full extent set forth herein with respect to (i) the Registrable Securities, (ii) any and all shares of Common Stock into which the
Registrable Securities are converted, exchanged or substituted in any recapitalization or other capital reorganization by the Company and (iii) any and all equity securities of the Company or any successor or assign of the Company (whether by
merger, consolidation, sale of assets or otherwise) 

  

 14 

 
which may be issued in respect of, in conversion of, in exchange for or in substitution of, the Registrable Securities and shall be appropriately adjusted
for any stock dividends, splits, reverse splits, combinations, recapitalizations and the like occurring after the date hereof. The Company shall cause any successor or assign (whether by merger, consolidation, sale of assets or otherwise) to enter
into a new registration rights agreement with the Designated Holders on terms substantially the same as this Agreement as a condition of any such transaction. 
 4.2 No Inconsistent Agreements. The Company has not and shall not enter into any agreement with respect to its securities that prevents it from performing this Agreement. 
 4.3 Amendments and Waivers. The provisions of this Agreement may be amended and the Company may take action herein prohibited, or omit to perform
any act herein required to be performed by it, if, but only if, the Company has obtained the written consent of the Majority Holders of the Registrable Securities then in existence. 
 4.4 Severability. Whenever possible, each provision of this Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement shall be held to be prohibited by or invalid wider applicable law, such provision shall be ineffective only to the extent of such prohibition or invalidity, without invalidating the remainder of
such provision or the remaining provisions of this Agreement. 
 4.5 Counterparts. This Agreement may be executed in one or more
counterparts each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. 
 4.6
Notices. All notices, requests and other communications to any party hereunder shall be in writing (including telecopy, facsimile, email or similar writing) and shall be deemed given or made as of the date delivered, if delivered personally
or by telecopy, facsimile or email (provided that delivery by telecopy, facsimile or email shall be followed by delivery of an additional copy personally, by mail or by overnight courier), one day after being delivered by overnight courier or four
business days after being deposited in the mail, sent by registered or certified mail (postage prepaid for the most expeditious form of delivery, return receipt requested), to the parties at the following addresses (or to such other address or telex
or telecopy number as a party may have specified by notice given to the other party pursuant to this provision): 
 If to the Company, to:

 ADA-ES, Inc. 
 8100 SouthPark Way, Unit B 
 Littleton, Colorado 80120 
 Attention: Senior VP and CFO 
 Telephone: (303) 339-8850 
 Facsimile: (303) 734-0330 
 Email:
markm@adaes.com 
  

 15 

 With copy to: 
 Schuchat, Herzog & Brenman, LLC 
 1900 Wazee Street, Suite 300 
 Denver, Colorado 80202 
 Attention: Julie
Herzog 
 Telephone: (303) 295-9707 
 Facsimile: (303) 295-9701 
 Email: jherzog@shblegal.com 
 If to a Subscriber, to: 
 The address,
facsimile number or email address set forth on the signature page of this Agreement. 
 4.7 Governing Law. 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 or provisions which would result in the application of the substantive law of any other state. 
 4.8 Forum; Service of Process. Any legal suit, action or proceeding brought by any party or any of its Affiliates arising out of or based upon
this Agreement shall be instituted in any federal or state court in New York County, New York, and each party waives any objection which it may now or hereafter have to the laying of venue or any such proceeding, and irrevocably submits to the
jurisdiction of such courts in any such suit, action or proceeding. 
 4.9 Captions. The captions, headings and arrangements used in
this Agreement are for convenience only and do not in any way limit or amplify the terms and provisions hereof. 
 4.10 No Prejudice.
The terms of this Agreement shall not be construed in favor of or against any party on account of its participation in the preparation hereof. 
 4.11 Words in Singular and Plural Form. Words used in the singular form in this Agreement shall be deemed to import the plural, and vice versa, as the sense may require. 
 4.12 Remedy for Breach. The Company hereby acknowledges that in the event of any breach or threatened breach by the Company of any of the
provisions of this Agreement, the Designated Holders would have no adequate remedy at law and could suffer substantial and irreparable damage. Accordingly, the Company hereby agrees that, in such event, the Designated Holders shall be entitled, and
notwithstanding any election by any Designated Holder to claim damages, to obtain a temporary and/or permanent injunction to restrain any such breach or threatened breach or to obtain specific performance of any such provisions, all without
prejudice to any and all other remedies which any Designated Holders may have at law or in equity. 
 4.13 Successors and Assigns, Third
Party Beneficiaries. This Agreement and all of the provisions hereof shall be binding upon and inure to the benefit of the parties hereto, each permitted assignee of a party, any Designated Holder permitted pursuant to Article 3 and their
respective permitted successors and assigns and executors, administrators and heirs. 
  

 16 

 4.14 Entire Agreement. This Agreement sets forth the entire agreement and understanding between
the parties as to the subject matter hereof and merges and supersedes all prior discussions, agreements and understandings of any and every nature among them. 
 4.15 Termination of Rights. Upon the expiration of the Registration Period all rights of Designated Holders under Section 2.1 of this Agreement will terminate. All rights under this Agreement will
terminate as to each Subscriber or Designated Holder when such Person no longer holds any Registrable Securities. 
 4.16 Force
Majeure. Notwithstanding anything to the contrary in this Agreement, no party to this Agreement will be liable for any failure or delay in its performance under this Agreement due to any cause beyond its reasonable control, including natural
disasters, war, embargo, riot, sabotage, labor shortage, act of terrorism, or governmental act, provided that the delayed party (a) gives the other parties prompt notice of such cause, and (b) uses reasonable commercial efforts to correct
promptly such failure or delay in performance. 
 4.17 Confidentiality. Each Subscriber agrees to keep confidential and not to
disclose to or use for the benefit of any third party any information which at any time is communicated by the Company or its representatives as being confidential without the prior written approval of the Company; provided, however, that this
provision shall not apply to information the Subscriber proves is already part of the public domain (except by breach of this Agreement) or is required to be disclosed by law, provided that Subscriber provides the Company with advance notice of such
disclosure and cooperates with the Company to prevent or limit the scope of such disclosure. 
 [Signature Page Follows] 
  

 17 

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

			
	COMPANY:
	
	ADA-ES, INC.
	
	A Colorado Corporation
		
	By:	 	/s/ Mark McKinnies
	Title:	 	Chief Financial Officer and Senior Vice President
	
	SUBSCRIBER:
	
	PERELLA WEINBERG PARTNERS OASIS MASTER FUND L.P.
	By: Perella Weinberg Partners Oasis Fund GP L.P., its general partner
	
	Julio Garcia
	[Print Name]
		
	By:	 	/s/ Julio Garcia
	Title:	 	Authorized Person, CFO
	
	JURISDICTION: Caymen Islands
		
	ADDRESS:	 	 c/o Perella Weinberg Partners, Capital Management
 767
Fifth Avenue
 New York, NY 10153

	 Facsimile: (212) 287- 3204

	 Email address:

 Aggregate Number of Shares of Common Stock: 389,611 
  

 18 

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

			
	COMPANY:
	
	ADA-ES, INC.
	
	A Colorado Corporation
		
	By:	 	/s/ Mark McKinnies
	Title:	 	Chief Financial Officer and Senior Vice President
	
	SUBSCRIBER:
	
	Black River Small Capitalization Fund Ltd.
	By: Black River Asset Management LLC, its Investment Advisors
	
	Eric Larson
	[Print Name]
		
	By:	 	/s/ Eric Larson
	Title:	 	Principal
	
	JURISDICTION: Minnesota
		
	ADDRESS:	 	 c/o Black River Asset Management LLC
 12700 Whitewater
Drive
 Minnetonka, MN 55343

	 Facsimile: (952) 984- 3806

	 Email address: Richard.Gammill@black-river.com

 Aggregate Number of Shares of Common Stock: 325,000 
  

 19 

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

			
	COMPANY:
	
	ADA-ES, INC.
	
	A Colorado Corporation
		
	By:	 	/s/ Mark McKinnies
	Title:	 	Chief Financial Officer and Senior Vice President
	
	SUBSCRIBER:
	
	Black River Commodity Select Fund Ltd.
	 By: Black River Asset Management LLC,
 its
Investment Advisors

	
	Eric Larson
	[Print Name]
		
	By:	 	/s/ Eric Larson
	Title:	 	Principal
	
	JURISDICTION: Minnesota
		
	ADDRESS:	 	 c/o Black River Asset Management LLC 12700 Whitewater Drive
 Minnetonka, MN 55343

	 Facsimile: (952) 984- 3806

	 Email address: Richard.Gammill@black-river.com

 Aggregate Number of Shares of Common Stock: 194,481 
  

 20

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