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EX-4.2

 EXHIBIT 4.2 

NEITHER THESE SECURITIES NOR THE SECURITIES ISSUABLE UPON EXERCISE OF THESE SECURITIES HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR
THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND ANY APPLICABLE STATE SECURITIES LAWS AND, ACCORDINGLY, MAY NOT BE OFFERED OR
SOLD EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO AN AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND IN ACCORDANCE WITH
APPLICABLE STATE SECURITIES LAWS AS EVIDENCED BY A LEGAL OPINION OF COUNSEL TO THE TRANSFEROR TO SUCH EFFECT, THE SUBSTANCE OF WHICH SHALL BE REASONABLY ACCEPTABLE TO THE COMPANY. THESE SECURITIES AND THE SECURITIES ISSUABLE UPON EXERCISE OF THESE
SECURITIES MAY BE PLEDGED IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT SECURED BY SUCH SECURITIES. 
 REAL GOODS SOLAR, INC. 

WARRANT TO PURCHASE COMMON STOCK 

Warrant No.: WPA-             

Number of Shares of Common Stock:              

Date of Issuance: February 27, 2015 (“Issuance Date”) 

Real Goods Solar, Inc., a Colorado corporation (the “Company”), hereby certifies that, for good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,                    , the registered holder hereof or its permitted
assigns (the “Holder”), is entitled, subject to the terms set forth below, to purchase from the Company, at the Exercise Price (as defined below) then in effect, at any time or times on or after the later of (i) six
(6) months after the Issuance Date, and (ii) the date as of which the Reverse Stock Split Resolution and the Authorized Shares Increase Resolution (each, as defined in the Securities Purchase Agreement) have been obtained and both the
Reverse Stock Split and Authorized Shares Increase Amendment have been adopted and become effective (the “Initial Exercisability Date”), but not after 11:59 p.m., New York time, on the Expiration Date, (as defined below), up to such
number of fully paid and nonassessable shares of Common Stock equal to the Warrant Share Number, subject to adjustment as provided herein (the “Warrant Shares”). Except as otherwise defined herein, capitalized terms in this Warrant
to Purchase Common Stock (including any warrants to purchase Common Stock issued in exchange, transfer or replacement hereof, this “Warrant”), shall have the meanings set forth in Section 17. Capitalized terms used herein and
not otherwise defined shall have the definitions ascribed to such terms in the Securities Purchase Agreement. 

 1. EXERCISE OF WARRANT. 

(a) Mechanics of Exercise. Subject to the terms and conditions hereof (including, without limitation, the limitations set forth in
Section 1(f)), this Warrant may be exercised by the Holder at any time or times on or after the Initial Exercisability Date, in whole or in part, by (i) delivery of a written notice, in the form attached hereto as Exhibit A (the
“Exercise Notice”), of the Holder’s election to exercise this Warrant and (ii) (A) payment to the Company of an amount equal to the applicable Exercise Price multiplied by the number of Warrant Shares as to which this
Warrant is being exercised (the “Aggregate Exercise Price”) in cash by wire transfer of immediately available funds or (B) if the provisions of Section 1(d) are applicable, by notifying the Company that this Warrant is
being exercised pursuant to a Cashless Exercise (as defined in Section 1(d)). The Holder shall not be required to deliver the original Warrant in order to effect an exercise hereunder. Execution and delivery of the Exercise Notice with respect
to less than all of the Warrant Shares shall have the same effect as cancellation of the original Warrant and issuance of a new Warrant evidencing the right to purchase the remaining number of Warrant Shares. Execution and delivery of an Exercise
Notice for all of the then remaining Warrant Shares shall have the same effect as cancellation of the original of this Warrant after delivery of the Warrant Shares in accordance with the terms hereof. On or before the first (1st) Trading Day following the date on which the Company has received the Exercise Notice, the Company shall transmit by facsimile an acknowledgment of confirmation of receipt of the Exercise
Notice to the Holder and the Company’s transfer agent (the “Transfer Agent”). On or before the third (3rd) Trading Day following the date on which the Company has received the Exercise Notice, so long as the Holder
delivers the Aggregate Exercise Price (or notice of a Cashless Exercise) on or prior to the second (2nd) Trading Day following the date on which the Company has received the Exercise Notice (the “Share Delivery Date”) (provided
that if the Aggregate Exercise Price has not been delivered by such date, the Share Delivery Date shall be one (1) Trading Day after the Aggregate Exercise Price (or notice of a Cashless Exercise) is delivered), the Company shall
(X) provided that the Transfer Agent is participating in The Depository Trust Company (“DTC”) Fast Automated Securities Transfer Program and the Holder may sell the Warrant Shares without restriction or limitation either
(I) pursuant to Rule 144 of the Securities Act and without the requirement to be in compliance with Rule 144(c)(1) of the Securities Act or (II) pursuant to an effective registration statement registering the Warrant Shares for issuance, credit
such aggregate number of Warrant Shares to which the Holder is entitled pursuant to such exercise to the Holder’s or its designee’s balance account with DTC through its Deposit / Withdrawal At Custodian system, or (Y) if the Transfer
Agent is not participating in the DTC Fast Automated Securities Transfer Program or if Holder may not sell the Warrant Shares without restriction or limitation either (I) pursuant to Rule 144 of the Securities Act and without the requirement to
be in compliance with Rule 144(c)(1) of the Securities Act or (II) pursuant to an effective registration statement registering the Warrant Shares for issuance, issue and dispatch by overnight courier to the address as specified in the Exercise
Notice, a certificate, registered in the Company’s share register in the name of the Holder or its designee, for the number of Warrant Shares to which the Holder is entitled pursuant to such exercise. The Company shall be responsible for all
fees and expenses of the Transfer Agent and all fees and expenses with respect to the issuance of Warrant Shares via DTC, if any. Upon delivery of the Exercise Notice, the Holder shall be deemed for all corporate purposes to have become the holder
of record of the Warrant Shares with respect to which this Warrant has 

  
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been exercised, irrespective of the date such Warrant Shares are credited to the Holder’s DTC account or the date of delivery of the certificates evidencing such Warrant Shares, as the case
may be. If this Warrant is submitted in connection with any exercise pursuant to this Section 1(a) and the number of Warrant Shares represented by this Warrant submitted for exercise is greater than the number of Warrant Shares being acquired
upon an exercise, then the Company shall as soon as practicable and in no event later than three (3) Trading Days after any exercise and at its own expense, issue a new Warrant (in accordance with Section 7(d)) representing the right to
purchase the number of Warrant Shares issuable immediately prior to such exercise under this Warrant, less the number of Warrant Shares with respect to which this Warrant is exercised. No fractional Warrant Shares are to be issued upon the exercise
of this Warrant, but rather the number of Warrant Shares to be issued shall be rounded up to the nearest whole number. The Company shall pay any and all taxes (other than the Holder’s income taxes) which may be payable with respect to the
issuance and delivery of Warrant Shares upon exercise of this Warrant. The Company’s obligations to issue and deliver Warrant Shares in accordance with the terms and subject to the conditions hereof are absolute and unconditional, irrespective
of any action or inaction by the Holder to enforce the same, any waiver or consent with respect to any provision hereof, the recovery of any judgment against any Person or any action to enforce the same, or any setoff, counterclaim, recoupment,
limitation or termination. 
 (b) Exercise Price. For purposes of this Warrant, “Exercise Price” means $0.50,
subject to adjustment as provided herein. 
 (c) Company’s Failure to Timely Deliver Securities. If the Company shall fail for
any reason or for no reason to issue to the Holder on or prior to the Share Delivery Date either (I) if the Transfer Agent is not participating in the DTC Fast Automated Securities Transfer Program, a certificate for the number of shares of
Common Stock to which the Holder is entitled and register such shares of Common Stock on the Company’s share register or if the Transfer Agent is participating in the DTC Fast Automated Securities Transfer Program, to credit the Holder’s
balance account with DTC, for such number of shares of Common Stock to which the Holder is entitled upon the Holder’s exercise of this Warrant, or (II) if the Transfer Agent is not participating in the DTC Fast Automated Securities Transfer
Program, the Company shall fail to issue and deliver a certificate to the Holder and register such shares of Common Stock on the Company’s share register or, if the Transfer Agent is participating in the DTC Fast Automated Securities Transfer
Program, credit the Holder’s balance account with DTC for the number of shares of Common Stock to which the Holder is entitled upon the Holder’s exercise hereunder or pursuant to the Company’s obligation pursuant to clause
(ii) below, and if on or after such Trading Day the Holder (or any other Person in respect, or on behalf, of the Holder) purchases (in an open market transaction or otherwise) shares of Common Stock to deliver in satisfaction of a sale by the
Holder of all or any portion of the number of shares of Common Stock equal to or any portion of the number of shares of Common Stock issuable upon such exercise that the Holder anticipated receiving from the Company (a “Buy-In”),
then, in addition to all other remedies available to the Holder, the Company shall, within three (3) Trading Days after the Holder’s request and in the Holder’s discretion, either (i) pay cash to the Holder in an amount equal to
the Holder’s total purchase price (including brokerage commissions and other out-of-pocket expenses, if any) for the shares of Common Stock so purchased (the “Buy-In Price”), at which point the Company’s obligation to
deliver such certificate (and to issue such 

  
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shares of Common Stock) or credit such Holder’s balance account with DTC for such shares of Common Stock shall terminate, or (ii) promptly honor its obligation to deliver to the Holder
a certificate or certificates representing such shares of Common Stock or credit such Holder’s balance account with DTC, as applicable, and pay cash to the Holder in an amount equal to the excess (if any) of the Buy-In Price over the product of
(A) such number of shares of Common Stock, times (B) any trading price of the Common Stock selected by the Holder in writing as in effect at any time during the period beginning on the date of the applicable Exercise Notice and ending on
the date of such issuance and payment under this Section 3(c). Nothing shall limit the Holder’s right to pursue any other remedies available to it hereunder, at law or in equity, including, without limitation, a decree of specific
performance and/or injunctive relief with respect to the Company’s failure to timely deliver certificates representing shares of Common Stock (or to electronically deliver such shares of Common Stock) upon the exercise of this Warrant as
required pursuant to the terms hereof. 
 (d) Cashless Exercise. Notwithstanding anything contained herein to the contrary, the
Holder may, in its sole discretion, exercise this Warrant in whole or in part and, in lieu of making the cash payment otherwise contemplated to be made to the Company upon such exercise in payment of the Aggregate Exercise Price, elect instead to
receive upon such exercise the “Net Number” of shares of Common Stock determined according to the following formula (a “Cashless Exercise”): 

Net Number = (A x B) - (A x C) 

D 
 For purposes of the
foregoing formula: 
  

	 	A=	the total number of shares with respect to which this Warrant is then being exercised. 

  

	 	B=	the arithmetic average of the Closing Sale Prices of the Common Stock for the five (5) consecutive Trading Days ending on the date immediately preceding the date of the Exercise Notice. 

 

	 	C=	the Exercise Price then in effect for the applicable Warrant Shares at the time of such exercise. 

  

	 	D=	the Closing Sale Price of the Common Stock on the date of the Exercise Notice. 

 If Warrant
Shares are issued in a Cashless Exercise, the parties acknowledge and agree that in accordance with Section 3(a)(9) of the 1933 Act, the Warrant Shares shall take on the registered characteristics of the warrants being exercised, and the
holding period of the warrants being exercised may be tacked on to the holding period of the Warrant Shares. The Company agrees not to take any position contrary to this Section 1(d). 

(e) Disputes. In the case of a dispute as to the determination of the Exercise Price or the arithmetic calculation of the Warrant
Shares, the Company shall promptly issue to the Holder the number of Warrant Shares that are not disputed and resolve such dispute in accordance with Section 12. 

  
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 (f) Beneficial Ownership Limitation on Exercises. Notwithstanding anything to the
contrary contained herein, the Company shall not effect the exercise of any portion of this Warrant, and the Holder shall not have the right to exercise any portion of this Warrant, pursuant to the terms and conditions of this Warrant and any such
exercise shall be null and void and treated as if never made, to the extent that after giving effect to such exercise, the Holder together with the other Attribution Parties collectively would beneficially own in excess of 9.99% (the
“Maximum Percentage”) of the number of shares of Common Stock outstanding immediately after giving effect to such exercise. For purposes of the foregoing sentence, the aggregate number of shares of Common Stock beneficially owned by
the Holder and the other Attribution Parties shall include the number of shares of Common Stock held by the Holder and all other Attribution Parties plus the number of shares of Common Stock issuable upon exercise of this Warrant with respect to
which the determination of such sentence is being made, but shall exclude the number of shares of Common Stock which would be issuable upon (A) exercise of the remaining, unexercised portion of this Warrant beneficially owned by the Holder or
any of the other Attribution Parties and (B) exercise or conversion of the unexercised or unconverted portion of any other securities of the Company (including, without limitation, any convertible notes or convertible preferred stock or
warrants). For purposes of this Section 1(f), beneficial ownership shall be calculated in accordance with Section 13(d) of the Securities Exchange Act of 1934, as amended (the “1934 Act”). For purposes of this Warrant, in
determining the number of outstanding shares of Common Stock the Holder may acquire upon the exercise of this Warrant without exceeding the Maximum Percentage, the Holder may rely on the number of outstanding shares of Common Stock as reflected in
(x) the Company’s most recent Annual Report on Form 10-K, Quarterly Report on Form 10-Q, Current Report on Form 8-K or other public filing with the Securities and Exchange Commission (the “SEC”), as the case may be,
(y) a more recent public announcement by the Company or (3) any other written notice by the Company or the Transfer Agent setting forth the number of shares of Common Stock outstanding (the “Reported Outstanding Share
Number”). If the Company receives an Exercise Notice from the Holder at a time when the actual number of outstanding shares of Common Stock is less than the Reported Outstanding Share Number, the Company shall (i) notify the Holder in
writing of the number of shares of Common Stock then outstanding and, to the extent that such Exercise Notice would otherwise cause the Holder’s beneficial ownership, as determined pursuant to this Section 1(f), to exceed the Maximum
Percentage, the Holder must notify the Company of a reduced number of Warrant Shares to be purchased pursuant to such Exercise Notice (the number of shares by which such purchase is reduced, the “Reduction Shares”) and (ii) as
soon as reasonably practicable, the Company shall return to the Holder any exercise price paid by the Holder for the Reduction Shares. For any reason at any time, upon the written or oral request of the Holder, the Company shall within one
(1) Business Day confirm orally and in writing or by electronic mail to the Holder the number of shares of Common Stock then outstanding. In any case, the number of outstanding shares of Common Stock shall be determined after giving effect to
the conversion or exercise of securities of the Company, including this Warrant, by the Holder and any other Attribution Party since the date as of which the Reported Outstanding Share Number was reported. In the event that the issuance of shares of
Common Stock to the Holder upon exercise of this Warrant results in the Holder and the other Attribution Parties being deemed to 

  
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beneficially own, in the aggregate, more than the Maximum Percentage of the number of outstanding shares of Common Stock (as determined under Section 13(d) of the 1934 Act), the number of
shares so issued by which the Holder’s and the other Attribution Parties’ aggregate beneficial ownership exceeds the Maximum Percentage (the “Excess Shares”) shall be deemed null and void and shall be cancelled ab initio,
and the Holder shall not have the power to vote or to transfer the Excess Shares. As soon as reasonably practicable after the issuance of the Excess Shares has been deemed null and void, the Company shall return to the Holder the exercise price paid
by the Holder for the Excess Shares. Upon delivery of a written notice to the Company, the Holder may from time to time increase (with such increase not effective until the sixty-first
(61st) day after delivery of such notice) or decrease the Maximum Percentage to any other percentage not in excess of 9.99% as specified in such notice; provided that any such increase in the
Maximum Percentage will not be effective until the sixty-first (61st) day after such notice is delivered to the Company. For purposes of clarity, the shares of Common Stock issuable pursuant
to the terms of this Warrant in excess of the Maximum Percentage shall not be deemed to be beneficially owned by the Holder for any purpose including for purposes of Section 13(d) or Rule 16a-1(a)(1) of the 1934 Act. The provisions of this
paragraph shall be construed and implemented in a manner otherwise than in strict conformity with the terms of this Section 1(f) to the extent necessary to correct this paragraph or any portion of this paragraph which may be defective or
inconsistent with the intended beneficial ownership limitation contained in this Section 1(f) or to make changes or supplements necessary or desirable to properly give effect to such limitation. The limitation contained in this paragraph may
not be waived and shall apply to a successor holder of this Warrant. 
 (g) Insufficient Authorized Shares. The Company shall not
issue shares upon exercise of this Warrant if such shares are not then authorized. From and after the date the Reverse Stock Split Resolution and the Authorized Shares Increase Resolution (each, as defined in the Securities Purchase Agreement) have
been obtained and both the Reverse Stock Split and Authorized Shares Increase Amendment have been adopted and become effective and while this Warrant remains outstanding, the Company shall initially reserve out of its authorized and unissued Common
Stock shares of Common Stock (as adjusted for any stock dividend, stock split, stock combination, reclassification or similar transaction occurring after the Subscription Date) equal to at least 135% of the shares of Common Stock issuable upon
exercise of this Warrant. The number of shares of Common Stock that the Company is required form time to time to reserve from its authorized and unissued capital for the exercise of this Warrant is herein referred to as the “Required Reserve
Amount” and the failure to have such sufficient number of authorized and unreserved shares of Common Stock is herein referred to as an “Authorized Share Failure”. If at any time from and after the date the Reverse Stock
Split Resolution and the Authorized Shares Increase Resolution (each, as defined in the Securities Purchase Agreement) have been obtained and both the Reverse Stock Split and Authorized Shares Increase Amendment have been adopted and become
effective and while this Warrant remains outstanding, the Company does not have at least the Required Reserve Amount of authorized and unreserved shares of Common Stock to satisfy its obligation to reserve for issuance upon exercise of this Warrant,
then the Company shall promptly take all action reasonably necessary to increase the Company’s authorized shares of Common Stock to an amount sufficient to allow the Company to reserve the Required Reserve Amount for this Warrant. Without
limiting the generality of the foregoing sentence, as soon as practicable after the date of the occurrence of an 

  
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Authorized Share Failure, but in no event later than seventy-five (75) days after the occurrence of such Authorized Share Failure, the Company shall hold a meeting of its shareholders for
the approval of an increase in the number of authorized shares of Common Stock. In connection with such meeting, the Company shall provide each shareholder with a proxy statement and shall use its reasonable best efforts to solicit its
shareholders’ approval of such increase in authorized shares of Common Stock and to cause its board of directors to recommend to the shareholders that they approve such proposal. Notwithstanding the foregoing, if at any such time of an
Authorized Share Failure, the Company is able to obtain the written consent of a majority of the shares of its issued and outstanding Common Stock to approve the increase in the number of authorized shares of Common Stock, the Company may satisfy
this obligation by obtaining such consent and submitting for filing with the SEC an Information Statement on Schedule 14C. In the event that upon any exercise of this Warrant, the Company does not have sufficient authorized shares to deliver in
satisfaction of such exercise, then unless the Holder elects to void such attempted exercise, the Holder may require in lieu of delivering the number of Warrant Shares that the Company is unable to deliver pursuant to this Section 1(g), the
Company to pay to the Holder within three (3) Trading Days of the applicable exercise, cash in an amount equal to the greatest Closing Sale Price of the Common Stock on any Trading Day at any time during the period beginning on the date of the
applicable Exercise Notice and ending on the date the Company makes the payment provided for in this sentence. 
 2. ADJUSTMENT OF
EXERCISE PRICE AND NUMBER OF WARRANT SHARES. The Exercise Price and the number of Warrant Shares shall be adjusted from time to time as follows: 

(a) [Reserved.] 
 (b)
Voluntary Adjustment By Company. The Company may at any time during the term of this Warrant, with the prior written consent of the Holder, reduce the then current Exercise Price to any amount and for any period of time deemed appropriate by
the Board of Directors of the Company. 
 (c) Adjustment Upon Subdivision or Combination of Shares of Common Stock. If the Company at
any time on or after the Subscription Date subdivides (by any stock split, stock dividend, recapitalization or otherwise) one or more classes of its outstanding shares of Common Stock into a greater number of shares, the Exercise Price in effect
immediately prior to such subdivision will be proportionately reduced and the number of Warrant Shares will be proportionately increased. If the Company at any time on or after the Subscription Date combines (by combination, reverse stock split or
otherwise) one or more classes of its outstanding shares of Common Stock into a smaller number of shares, the Exercise Price in effect immediately prior to such combination will be proportionately increased and the number of Warrant Shares will be
proportionately decreased. Any adjustment under this Section 2(c) shall become effective at the close of business on the date the subdivision or combination becomes effective. 

  
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 (d) Other Events. If any event occurs of the type contemplated by the provisions of this
Section 2 but not expressly provided for by such provisions (including, without limitation, the granting of stock appreciation rights, phantom stock rights or other rights with equity features), then the Company’s Board of Directors will
make an appropriate adjustment in the Exercise Price and the number of Warrant Shares, as mutually determined by the Company’s Board of Directors and the Holder, so as to protect the rights of the Holder; provided that no such adjustment
pursuant to this Section 2(d) will increase the Exercise Price or decrease the number of Warrant Shares as otherwise determined pursuant to this Section 2. 

3. RIGHTS UPON DISTRIBUTION OF ASSETS. If the Company shall declare or make any dividend or other distribution of its assets (or rights
to acquire its assets) to holders of shares of Common Stock, by way of return of capital or otherwise (including, without limitation, any distribution of cash, stock or other securities, property, options, evidence of indebtedness or any other
assets by way of a dividend, spin off, reclassification, corporate rearrangement, scheme of arrangement or other similar transaction) (a “Distribution”), at any time after the issuance of this Warrant, then, in each such case, the
Holder shall be entitled to participate in such Distribution to the same extent that the Holder would have participated therein if the Holder had held the number of shares of Common Stock acquirable upon complete exercise of this Warrant (without
regard to any limitations or restrictions on exercise of this Warrant, including without limitation, the Maximum Percentage, and as if both of the Reverse Stock Split and the Authorized Shares Increase Amendment had, as of such date, been adopted
and become effective) immediately before the date of which a record is taken for such Distribution, or, if no such record is taken, the date as of which the record holders of shares of Common Stock are to be determined for the participation in such
Distribution (provided, however, that to the extent that the Holder’s right to participate in any such Distribution would result in the Holder and the other Attribution Parties exceeding the Maximum Percentage, then the Holder
shall not be entitled to participate in such Distribution to such extent (and shall not be entitled to beneficial ownership of such shares of Common Stock as a result of such Distribution (and beneficial ownership) to such extent) and the portion of
such Distribution shall be held in abeyance for the benefit of the Holder until such time or times as its right thereto would not result in the Holder and the other Attribution Parties exceeding the Maximum Percentage, at which time or times the
Holder shall be granted such Distribution (and any Distributions declared or made on such initial Distribution or on any subsequent Distribution held similarly in abeyance) to the same extent as if there had been no such limitation). 

4. PURCHASE RIGHTS; FUNDAMENTAL TRANSACTIONS. 

(a) Purchase Rights. In addition to any adjustments pursuant to Section 2 above, if at any time the Company grants, issues or
sells any Options, Convertible Securities or rights to purchase stock, warrants, securities or other property pro rata to the record holders of any class of Common Stock (the “Purchase Rights”), then the Holder will be entitled to
acquire, upon the terms applicable to such Purchase Rights, the aggregate Purchase Rights which the Holder could have acquired if the Holder had held the number of shares of Common Stock acquirable upon complete exercise of this Warrant (without
regard to any limitations or restrictions on exercise of this Warrant, including without limitation, the Maximum Percentage, and as if both of the Reverse Stock Split and the Authorized Shares Increase Amendment had, as of such date, been adopted
and become effective) immediately before the date on which a record is taken for the grant, issuance or sale of such Purchase Rights, or, if no such record is taken, the 

  
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date as of which the record holders of shares of Common Stock are to be determined for the grant, issue or sale of such Purchase Rights (provided, however, that to the extent that
the Holder’s right to participate in any such Purchase Right would result in the Holder and the other Attribution Parties exceeding the Maximum Percentage, then the Holder shall not be entitled to participate in such Purchase Right to such
extent (and shall not be entitled to beneficial ownership of such shares of Common Stock as a result of such Purchase Right (and beneficial ownership) to such extent) and such Purchase Right to such extent shall be held in abeyance for the benefit
of the Holder until such time or times as its right thereto would not result in the Holder and the other Attribution Parties exceeding the Maximum Percentage, at which time or times the Holder shall be granted such right (and any Purchase Right
granted, issued or sold on such initial Purchase Right or on any subsequent Purchase Right held similarly in abeyance) to the same extent as if there had been no such limitation). 

(b) Fundamental Transactions. The Company shall not enter into or be party to a Fundamental Transaction unless the Successor Entity
assumes in writing all of the obligations of the Company under this Warrant in accordance with the provisions of this Section 4(b) pursuant to written agreements in form and substance reasonably satisfactory to the Holder and approved by the
Holder, such approval not to be unreasonably withheld or delayed, prior to such Fundamental Transaction, including agreements, if so requested by the Holder, to deliver to the Holder in exchange for this Warrant a security of the Successor Entity
evidenced by a written instrument substantially similar in form and substance to this Warrant, including, without limitation, an adjusted exercise price equal to the value for the shares of Common Stock reflected by the terms of such Fundamental
Transaction, and exercisable for a corresponding number of shares of capital stock equivalent to the shares of Common Stock acquirable and receivable upon exercise of this Warrant (without regard to any limitations on the exercise of this Warrant
and as if both of the Reverse Stock Split and the Authorized Shares Increase Amendment had, as of such date, been adopted and become effective) prior to such Fundamental Transaction, and satisfactory to the Holder, and with an exercise price which
applies the exercise price hereunder to such shares of capital stock (but taking into account the relative value of the shares of Common Stock pursuant to such Fundamental Transaction and the value of such shares of capital stock, such adjustments
to the number of shares of capital stock and such exercise price being for the purpose of protecting the economic value of this Warrant immediately prior to the occurrence or consummation of such Fundamental Transaction). Upon the occurrence or
consummation of any Fundamental Transaction, and it shall be a required condition to the occurrence or consummation of any Fundamental Transaction that, the Company and the Successor Entity or Successor Entities, jointly and severally, shall succeed
to, and the Company shall cause any Successor Entity or Successor Entities to jointly and severally succeed to, and be added to the term “Company” under this Warrant (so that from and after the date of such Fundamental Transaction, and the
provisions of this Warrant referring to the “Company” shall refer instead to each of the Company and the Successor Entity or Successor Entities, jointly and severally), and the Company and the Successor Entity or Successor Entities,
jointly and severally, may exercise every right and power of the Company prior thereto and shall assume all of the obligations of the Company prior thereto under this Warrant with the same effect as if the Company and such Successor Entity or
Successor Entities, jointly and severally, had been named as the Company in this Warrant, and, solely at the request of the Holder, if the Successor Entity and/or Successor Entities is a publicly traded corporation whose common stock is quoted on or
listed for trading 

  
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on an Eligible Market, shall deliver (in addition to and without limiting any right under this Warrant) to the Holder in exchange for this Warrant a security of the Successor Entity and/or
Successor Entities evidenced by a written instrument substantially similar in form and substance to this Warrant and exercisable for a corresponding number of shares of capital stock of the Successor Entity and/or Successor Entities (the
“Successor Capital Stock”) equivalent to the shares of Common Stock acquirable and receivable upon exercise of this Warrant (without regard to any limitations on the exercise of this Warrant and as if both of the Reverse Stock Split
and the Authorized Shares Increase Amendment had, as of such date, been adopted and become effective) prior to such Fundamental Transaction (such corresponding number of shares of Successor Capital Stock to be delivered to the Holder shall be equal
to the greater of (A) the quotient of (i) the aggregate dollar value of all consideration (including cash consideration and any consideration other than cash (“Non-Cash Consideration”), in such Fundamental Transaction, as
such values are set forth in any definitive agreement for the Fundamental Transaction that has been executed at the time of the first public announcement of the Fundamental Transaction or, if no such value is determinable from such definitive
agreement, as determined in accordance with Section 12 with the term “Non-Cash Consideration” being substituted for the term “Exercise Price”) that the Holder would have been entitled to receive upon the happening of such
Fundamental Transaction or the record, eligibility or other determination date for the event resulting in such Fundamental Transaction, had this Warrant been exercised immediately prior to such Fundamental Transaction or the record, eligibility or
other determination date for the event resulting in such Fundamental Transaction (without regard to any limitations on the exercise of this Warrant and as if both of the Reverse Stock Split and the Authorized Shares Increase Amendment had, as of
such date, been adopted and become effective) (the “Aggregate Consideration”) divided by (ii) the per share Closing Sale Price of such Successor Capital Stock on the Trading Day immediately prior to the consummation or
occurrence of the Fundamental Transaction and (B) the product of (i) the Aggregate Consideration and (ii) the highest exchange ratio pursuant to which any shareholder of the Company may exchange Common Stock for Successor Capital
Stock) (provided, however, to the extent that the Holder’s right to receive any such shares of publicly traded common stock (or their equivalent) of the Successor Entity would result in the Holder and its other Attribution Parties exceeding the
Maximum Percentage, if applicable, then the Holder shall not be entitled to receive such shares to such extent (and shall not be entitled to beneficial ownership of such shares of publicly traded common stock (or their equivalent) of the Successor
Entity as a result of such consideration to such extent) and the portion of such shares shall be held in abeyance for the Holder until such time or times, as its right thereto would not result in the Holder and its other Attribution Parties
exceeding the Maximum Percentage, at which time or times the Holder shall be delivered such shares to the extent as if there had been no such limitation), and such security shall be reasonably satisfactory to the Holder, and with an identical
exercise price to the Exercise Price hereunder (such adjustments to the number of shares of capital stock and such exercise price being for the purpose of protecting after the consummation or occurrence of such Fundamental Transaction the economic
value of this Warrant that was in effect immediately prior to the consummation or occurrence of such Fundamental Transaction, as elected by the Holder solely at its option). Upon occurrence or consummation of the Fundamental Transaction, and it
shall be a required condition to the occurrence or consummation of such Fundamental Transaction that, the Company and the Successor Entity or Successor Entities shall deliver to the 

  
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Holder confirmation that there shall be issued upon exercise of this Warrant at any time after the occurrence or consummation of the Fundamental Transaction, as elected by the Holder solely at
its option, shares of Common Stock, Successor Capital Stock or, in lieu of the shares of Common Stock or Successor Capital Stock (or other securities, cash, assets or other property purchasable upon the exercise of this Warrant prior to such
Fundamental Transaction), such shares of stock, securities, cash, assets or any other property whatsoever (including warrants or other purchase or subscription rights), which for purposes of clarification may continue to be shares of Common Stock,
if any, that the Holder would have been entitled to receive upon the happening of such Fundamental Transaction or the record, eligibility or other determination date for the event resulting in such Fundamental Transaction, had this Warrant been
exercised immediately prior to such Fundamental Transaction or the record, eligibility or other determination date for the event resulting in such Fundamental Transaction (without regard to any limitations on the exercise of this Warrant and as if
both of the Reverse Stock Split and the Authorized Shares Increase Amendment had, as of such date, been adopted and become effective), as adjusted in accordance with the provisions of this Warrant. In addition to and not in substitution for any
other rights hereunder, prior to the occurrence or consummation of any Fundamental Transaction pursuant to which holders of shares of Common Stock are entitled to receive securities, cash, assets or other property with respect to or in exchange for
shares of Common Stock (a “Corporate Event”), the Company shall make appropriate provision to ensure that, and any applicable Successor Entity or Successor Entities shall ensure that, and it shall be a required condition to the
occurrence or consummation of such Corporate Event that, the Holder will thereafter have the right to receive upon exercise of this Warrant at any time after the occurrence or consummation of the Corporate Event, shares of Common Stock or Successor
Capital Stock or, if so elected by the Holder, in lieu of the shares of Common Stock (or other securities, cash, assets or other property) purchasable upon the exercise of this Warrant prior to such Corporate Event (but not in lieu of such items
still issuable under Sections 3 and 4(a), which shall continue to be receivable on the Common Stock or on the such shares of stock, securities, cash, assets or any other property otherwise receivable with respect to or in exchange for shares of
Common Stock), such shares of stock, securities, cash, assets or any other property whatsoever (including warrants or other purchase or subscription rights and any shares of Common Stock) which the Holder would have been entitled to receive upon the
occurrence or consummation of such Corporate Event or the record, eligibility or other determination date for the event resulting in such Corporate Event, had this Warrant been exercised immediately prior to such Corporate Event or the record,
eligibility or other determination date for the event resulting in such Corporate Event (without regard to any limitations on exercise of this Warrant and as if both of the Reverse Stock Split and the Authorized Shares Increase Amendment had, as of
such date, been adopted and become effective). Provision made pursuant to the preceding sentence shall be in a form and substance reasonably satisfactory to the Holder. The provisions of this Section 4(b) shall apply similarly and equally to
successive Fundamental Transactions and Corporate Events. Notwithstanding the foregoing, the Holder may elect, in its sole discretion, by delivery of written notice to the Company, to waive this Section 4(b) and allow the Company to enter into
or be a party to a Fundamental Transaction without the assumption of this Warrant pursuant to the provisions of this Section 4(b). 

  
 - 11 - 

 (c) Notwithstanding the foregoing, in the event of a Fundamental Transaction, other than one in
which the Successor Entity that is a publicly traded corporation whose stock is quoted or listed for trading on an Eligible Market and which Successor Entity assumes this Warrant such that the Warrant shall be exercisable for the publicly traded
Common Stock of such Successor Entity, at the request of the Holder delivered before the thirtieth (30th) day after either the occurrence or consummation of such Fundamental Transaction, the
Company (or the Successor Entity) shall purchase this Warrant from the Holder by paying to the Holder, within five (5) Business Days after such request (or, if later, on the effective date of the Fundamental Transaction), cash in an amount
equal to the Black Scholes Value of the remaining unexercised portion of this Warrant on the date of such Fundamental Transaction. 
 5.
NONCIRCUMVENTION. The Company hereby covenants and agrees that the Company will not, by amendment of its Articles of Incorporation or Bylaws, or through any reorganization, transfer of assets, consolidation, merger, scheme of arrangement,
dissolution, issue or sale of securities, or any other voluntary action, avoid or seek to avoid the observance or performance of any of the terms of this Warrant, and will at all times in good faith carry out all of the provisions of this Warrant
and take all action as may be required to protect the rights of the Holder. Without limiting the generality of the foregoing, the Company (i) shall not increase the par value of any shares of Common Stock receivable upon the exercise of this
Warrant above the Exercise Price then in effect, (ii) shall take all such actions as may be necessary or appropriate in order that the Company may validly and legally issue fully paid and nonassessable shares of Common Stock upon the exercise
of this Warrant, and (iii) shall, so long as this Warrant is outstanding, take all action necessary to reserve and keep available out of its authorized and unissued shares of Common Stock, solely for the purpose of effecting the exercise of
this Warrant, the Required Reserve Amount to effect the exercise of this Warrant then outstanding (without regard to any limitations on exercise). 

6. WARRANT HOLDER NOT DEEMED A SHAREHOLDER. Except as otherwise specifically provided herein, the Holder, solely in such Person’s
capacity as a holder of this Warrant, shall not be entitled to vote or receive dividends or be deemed the holder of share capital of the Company for any purpose, nor shall anything contained in this Warrant be construed to confer upon the Holder,
solely in such Person’s capacity as the Holder of this Warrant, any of the rights of a shareholder of the Company or any right to vote, give or withhold consent to any corporate action (whether any reorganization, issue of stock,
reclassification of stock, consolidation, merger, conveyance or otherwise), receive notice of meetings, receive dividends or subscription rights, or otherwise, prior to the issuance to the Holder of the Warrant Shares which such Person is then
entitled to receive upon the due exercise of this Warrant. In addition, nothing contained in this Warrant shall be construed as imposing any liabilities on the Holder to purchase any securities (upon exercise of this Warrant or otherwise) or as a
shareholder of the Company, whether such liabilities are asserted by the Company or by creditors of the Company. Notwithstanding this Section 6, the Company shall provide the Holder with copies of the same notices and other information given to
the shareholders of the Company generally, contemporaneously with the giving thereof to the shareholders. 

  
 - 12 - 

 7. REISSUANCE OF WARRANTS. 

(a) Transfer of Warrant. Pursuant to FINRA Rule 5110(g), neither this Warrant nor any Warrant Shares issued upon exercise of this
Warrant shall be sold, transferred, assigned, pledged or hypothecated, or be the subject of any hedging, short sale, derivative, put or call transaction that would result in the effective economic disposition of the securities by any Person for a
period of 180 days immediately following the date of effectiveness or commencement of sales of the offering pursuant to which this Warrant is being issued, except the transfer of any security pursuant to FINRA Rule 5110(g)(2). If this Warrant is to
be transferred, the Holder shall surrender this Warrant to the Company, whereupon the Company will forthwith issue and deliver upon the order of the Holder a new Warrant (in accordance with Section 7(d)), registered as the Holder may request,
representing the right to purchase the number of Warrant Shares being transferred by the Holder and, if less than the total number of Warrant Shares then underlying this Warrant is being transferred, a new Warrant (in accordance with
Section 7(d)) to the Holder representing the right to purchase the number of Warrant Shares not being transferred. 
 (b) Lost,
Stolen or Mutilated Warrant. Upon receipt by the Company of evidence reasonably satisfactory to the Company of the loss, theft, destruction or mutilation of this Warrant, and, in the case of loss, theft or destruction, of any indemnification
undertaking by the Holder to the Company in customary form and, in the case of mutilation, upon surrender and cancellation of this Warrant, the Company shall execute and deliver to the Holder a new Warrant (in accordance with Section 7(d))
representing the right to purchase the Warrant Shares then underlying this Warrant. 
 (c) Exchangeable for Multiple Warrants. This
Warrant is exchangeable, upon the surrender hereof by the Holder at the principal office of the Company, for a new warrant or warrants (in accordance with Section 7(d)) representing in the aggregate the right to purchase the number of Warrant
Shares then underlying this Warrant, and each such new warrant will represent the right to purchase such portion of such Warrant Shares as is designated by the Holder at the time of such surrender; provided, however, that no warrants
for fractional Warrant Shares shall be given. 
 (d) Issuance of New Warrants. Whenever the Company is required to issue a new
Warrant pursuant to the terms of this Warrant, such new Warrant (i) shall be of like tenor with this Warrant, (ii) shall represent, as indicated on the face of such new Warrant, the right to purchase the Warrant Shares then underlying this
Warrant (or in the case of a new Warrant being issued pursuant to Section 7(a) or Section 7(c), the Warrant Shares designated by the Holder which, when added to the number of shares of Common Stock underlying the other new warrants issued
in connection with such issuance, does not exceed the number of Warrant Shares then underlying this Warrant), (iii) shall have an issuance date, as indicated on the face of such new Warrant which is the same as the Issuance Date, and
(iv) shall have the same rights and conditions as this Warrant. 
 8. NOTICES. Whenever notice is required to be given under
this Warrant, unless otherwise provided herein, such notice shall be given in accordance with Section 9 of the Placement Agency Agreement, dated February 23, 2015, between the Company and WestPark Capital, Inc. (the “Placement Agency
Agreement”). All notices to the Holder shall be given to the Placement Agent (as defined in the Placement Agency Agreement). The Company shall provide the Holder with prompt written notice of all actions taken pursuant to this Warrant,

  
 - 13 - 

 
including in reasonable detail a description of such action and the reason therefor. Without limiting the generality of the foregoing, the Company will give written notice to the Holder
(i) immediately upon any adjustment of the Exercise Price, setting forth in reasonable detail, and certifying, the calculation of such adjustment and (ii) at least fifteen (15) days prior to the date on which the Company closes its
books or takes a record (A) with respect to any dividend or distribution upon the shares of Common Stock, (B) with respect to any grants, issuances or sales of any Options, Convertible Securities or rights to purchase stock, warrants,
securities or other property to holders of shares of Common Stock or (C) for determining rights to vote with respect to any Fundamental Transaction, dissolution or liquidation; provided in each case that such information shall be made
known to the public prior to or in conjunction with such notice being provided to the Holder. It is expressly understood and agreed that the time of exercise specified by the Holder in each Exercise Notice shall be definitive and may not be disputed
or challenged by the Company. 
 9. AMENDMENT AND WAIVER. Except as otherwise provided herein, the provisions of this Warrant may be
amended or waived and the Company may take any action herein prohibited, or omit to perform any act herein required to be performed by it, only if the Company has obtained the written consent of the Holder. 

10. GOVERNING LAW; JURISDICTION; JURY TRIAL. This Warrant shall be governed by and construed and enforced in accordance with, and all
questions concerning the construction, validity, interpretation and performance of this Warrant shall be governed by, the internal laws of the State of New York, without giving effect to any choice of law or conflict of law provision or rule
(whether of the State of New York or any other jurisdictions) that would cause the application of the laws of any jurisdictions other than the State of New York. The Company hereby irrevocably submits to the exclusive jurisdiction of the state and
federal courts sitting in The City of New York, Borough of Manhattan, for the adjudication of any dispute hereunder or in connection herewith or with any transaction contemplated hereby or discussed herein, and hereby irrevocably waives, and agrees
not to assert in any suit, action or proceeding, any claim that it is not personally subject to the jurisdiction of any such court, that such suit, action or proceeding is brought in an inconvenient forum or that the venue of such suit, action or
proceeding is improper. The Company hereby irrevocably waives personal service of process and consents to process being served in any such suit, action or proceeding by mailing a copy thereof to the Company at the address set forth in
Section 9(f) of the Securities Purchase Agreement and agrees that such service shall constitute good and sufficient service of process and notice thereof. Nothing contained herein shall be deemed to limit in any way any right to serve process
in any manner permitted by law. Nothing contained herein shall be deemed or operate to preclude the Holder from bringing suit or taking other legal action against the Company in any other jurisdiction to collect on the Company’s obligations to
the Holder, to realize on any collateral or any other security for such obligations, or to enforce a judgment or other court ruling in favor of the Holder. THE COMPANY HEREBY IRREVOCABLY WAIVES ANY RIGHT IT MAY HAVE, AND AGREES NOT TO REQUEST, A
JURY TRIAL FOR THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN CONNECTION WITH OR ARISING OUT OF THIS WARRANT OR ANY TRANSACTION CONTEMPLATED HEREBY. 

  
 - 14 - 

 11. CONSTRUCTION; HEADINGS. This Warrant shall be deemed to be jointly drafted by the
Company and the Holder and shall not be construed against any Person as the drafter hereof. The headings of this Warrant are for convenience of reference and shall not form part of, or affect the interpretation of, this Warrant. 

12. DISPUTE RESOLUTION. In the case of a dispute as to the determination of the Exercise Price or the arithmetic calculation of the
Warrant Shares, the Company shall submit the disputed determinations or arithmetic calculations via facsimile within two (2) Business Days of receipt of the Exercise Notice giving rise to such dispute, as the case may be, to the Holder. If the
Holder and the Company are unable to agree upon such determination or calculation of the Exercise Price or the Warrant Shares within three (3) Business Days of such disputed determination or arithmetic calculation being submitted to the Holder,
then the Company shall, within two (2) Business Days submit via facsimile (a) the disputed determination of the Exercise Price to an independent, reputable investment bank selected by the Holder and approved by the Company, such approval
not to be unreasonably withheld or delayed or (b) the disputed arithmetic calculation of the Warrant Shares to the Company’s independent, outside accountant, selected by the Holder and approved by the Company, such approval not to be
unreasonably withheld or delayed. The Company shall cause at its expense the investment bank or the accountant, as the case may be, to perform the determinations or calculations and notify the Company and the Holder of the results no later than ten
(10) Business Days from the time it receives the disputed determinations or calculations. Such investment bank’s or accountant’s determination or calculation, as the case may be, shall be binding upon all parties absent demonstrable
error. 
 13. REMEDIES, OTHER OBLIGATIONS, BREACHES AND INJUNCTIVE RELIEF. The remedies provided in this Warrant shall be cumulative
and in addition to all other remedies available under this Warrant, at law or in equity (including a decree of specific performance and/or other injunctive relief), and nothing herein shall limit the right of the Holder to pursue actual damages for
any failure by the Company to comply with the terms of this Warrant. The Company acknowledges that a breach by it of its obligations hereunder will cause irreparable harm to the Holder and that the remedy at law for any such breach may be
inadequate. The Company therefore agrees that, in the event of any such breach or threatened breach, the holder of this Warrant shall be entitled, in addition to all other available remedies, to an injunction restraining any breach, without the
necessity of showing economic loss and without any bond or other security being required. 

  
 - 15 - 

 14. TRANSFER. This Warrant and the Warrant Shares may be offered for sale, sold,
transferred, pledged or assigned without the consent of the Company, subject to compliance with all applicable state and federal securities laws. The Holder, by acceptance of this Warrant, represents and warrants that it is acquiring this Warrant
and, upon any exercise of this Warrant, will acquire the Warrant Shares issuable upon such exercise, for its own account and not with a view to or for distributing or reselling such Warrant Shares or any part thereof in violation of the Securities
Act or any applicable state securities law, except pursuant to sales registered or exempted under the Securities Act. 
 15.
SEVERABILITY. If any provision of this Warrant is prohibited by law or otherwise determined to be invalid or unenforceable by a court of competent jurisdiction, the provision that would otherwise be prohibited, invalid or unenforceable shall
be deemed amended to apply to the broadest extent that it would be valid and enforceable, and the invalidity or unenforceability of such provision shall not affect the validity of the remaining provisions of this Warrant so long as this Warrant as
so modified continues to express, without material change, the original intentions of the parties as to the subject matter hereof and the prohibited nature, invalidity or unenforceability of the provision(s) in question does not substantially impair
the respective expectations or reciprocal obligations of the parties or the practical realization of the benefits that would otherwise be conferred upon the parties. The parties will endeavor in good faith negotiations to replace the prohibited,
invalid or unenforceable provision(s) with a valid provision(s), the effect of which comes as close as possible to that of the prohibited, invalid or unenforceable provision(s). 

16. DISCLOSURE. Upon receipt or delivery by the Company of any notice in accordance with the terms of this Warrant, unless the Company
has in good faith determined that the matters relating to such notice do not constitute material, nonpublic information relating to the Company or its Subsidiaries (as defined in the Securities Purchase Agreement), the Company shall within one
(1) Business Day after any such receipt or delivery publicly disclose such material, nonpublic information on a Current Report on Form 8-K or otherwise. In the event that the Company believes that a notice contains material, nonpublic
information relating to the Company or its Subsidiaries, the Company so shall indicate to such Holder contemporaneously with delivery of such notice, and in the absence of any such indication, the Holder shall be allowed to presume that all matters
relating to such notice do not constitute material, nonpublic information relating to the Company or its Subsidiaries. 
 17. CERTAIN
DEFINITIONS. For purposes of this Warrant, the following terms shall have the following meanings: 
 (a) “1933
Act” means the Securities Act of 1933, as amended. 
 (b) “Affiliate” means, with respect to any
Person, any other Person that directly or indirectly controls, is controlled by, or is under common control with, such Person, it being understood for purposes of this definition that “control” of a Person means the power directly or
indirectly either to vote 10% or more of the stock having ordinary voting power for the election of directors of such Person or direct or cause the direction of the management and policies of such Person whether by contract or otherwise. 

  
 - 16 - 

 (c) “Attribution Parties” means, collectively, the following Persons and
entities: (i) any investment vehicle, including, any funds, feeder funds or managed accounts, currently, or from time to time after the Issuance Date, directly or indirectly managed or advised by the Holder’s investment manager or any of
its Affiliates or principals, (ii) any direct or indirect Affiliates of the Holder or any of the foregoing, (iii) any Person acting or who could be deemed to be acting as a Group together with the Holder or any of the foregoing and
(iv) any other Persons whose beneficial ownership of the Company’s Common Stock would or could be aggregated with the Holder’s and the other Attribution Parties for purposes of Section 13(d) of the 1934 Act. For clarity, the
purpose of the foregoing is to subject collectively the Holder and all other Attribution Parties to the Maximum Percentage.  

(d) “Authorized Shares Increase Amendment” shall have the meaning ascribe to such term in the Securities Purchase
Agreement. 
 (e) “Black Scholes Value” means the value of this Warrant based on the Black-Scholes Option
Pricing Model obtained from the “OV” function on Bloomberg determined as of the day immediately following the public announcement of the applicable Fundamental Transaction, or, if the Fundamental Transaction is not publicly announced, the
date the Fundamental Transaction is consummated, for pricing purposes and reflecting (i) a risk-free interest rate corresponding to the U.S. Treasury rate for a period equal to the remaining term of this Warrant as of such date of request,
(ii) an expected volatility equal to the greater of 100% and the 100 day volatility obtained from the HVT function on Bloomberg as of the day immediately following the public announcement of the applicable Fundamental Transaction, or, if the
Fundamental Transaction is not publicly announced, the date the Fundamental Transaction is consummated, (iii) the underlying price per share used in such calculation shall be the sum of the price per share being offered in cash, if any, plus
the value of any non-cash consideration, if any, being offered in the Fundamental Transaction, (iv) a zero cost of borrow and (v) a 360 day annualization factor. 

(f) “Bloomberg” means Bloomberg Financial Markets. 

(g) “Business Day” means any day other than Saturday, Sunday or other day on which commercial banks in The City of New
York are authorized or required by law to remain closed. 
 (h) “Closing Bid Price” and “Closing Sale
Price” means, for any security as of any date, the last closing bid price and last closing trade price, respectively, for such security on the Principal Market, as reported by Bloomberg, or, if the Principal Market begins to operate on an
extended hours basis and does not designate the closing bid price or the closing trade price, as the case may be, then the last bid price or the last trade price, respectively, of such security prior to 4:00:00 p.m., New York time, as reported by
Bloomberg, or, if the Principal Market is not the principal securities exchange or trading market for such security, the last closing bid price or last trade price, respectively, of such security on the principal securities exchange or trading
market where such security is listed or traded as reported by Bloomberg, or if the foregoing do not apply, the last closing bid price or last trade price, respectively, of such security in the over-the-counter market on the electronic bulletin board
for such security as  

  
 - 17 - 

 
reported by Bloomberg, or, if no closing bid price or last trade price, respectively, is reported for such security by Bloomberg, the average of the bid prices, or the ask prices, respectively,
of any market makers for such security as reported in the OTC Link or “pink sheets” by OTC Markets Group Inc. (formerly Pink OTC Markets Inc.). If the Closing Bid Price or the Closing Sale Price cannot be calculated for a security on a
particular date on any of the foregoing bases, the Closing Bid Price or the Closing Sale Price, as the case may be, of such security on such date shall be the fair market value as mutually determined by the Company and the Holder. If the Company and
the Holder are unable to agree upon the fair market value of such security, then such dispute shall be resolved pursuant to Section 12. All such determinations to be appropriately adjusted for any stock dividend, stock split, stock combination,
reclassification or other similar transaction during the applicable calculation period. 
 (i) “Common Stock” means
(i) the Company’s shares of Class A Common Stock, par value $0.0001 per share, and (ii) any share capital into which such Common Stock shall have been changed or any share capital resulting from a reclassification of such Common
Stock. 
 (j) “Convertible Securities” means any stock or securities (other than Options) directly or
indirectly convertible into or exercisable or exchangeable for shares of Common Stock. 
 (k) “Eligible
Market” means the Principal Market, the NYSE MKT LLC, The NASDAQ Global Market, The NASDAQ Global Select Market, The New York Stock Exchange, Inc., the OTC QX or the OTC QB. 

(l) “Expiration Date” means February 22, 2020. 

(m) “Fundamental Transaction” means (A) that the Company shall, directly or indirectly, including through Subsidiaries,
Affiliates or otherwise, in one or more related transactions, (i) consolidate or merge with or into (whether or not the Company is the surviving corporation) another Subject Entity, or (ii) sell, assign, transfer, convey or otherwise
dispose of all or substantially all of the properties or assets of the Company or any of its “significant subsidiaries” (as defined in Rule 1-02 of Regulation S-X) to one or more Subject Entities, or (iii) make, or allow one or more
Subject Entities to make, or allow the Company to be subject to or have its Common Stock be subject to or party to one or more Subject Entities making, a purchase, tender or exchange offer that is accepted by the holders of at least either
(x) 50% of the outstanding shares of Common Stock, (y) 50% of the outstanding shares of Common Stock calculated as if any shares of Common Stock held by all Subject Entities making or party to, or Affiliated with any Subject Entities
making or party to, such purchase, tender or exchange offer were not outstanding; or (z) such number of shares of Common Stock such that all Subject Entities making or party to, or Affiliated with any Subject Entity making or party to, such
purchase, tender or exchange offer, become collectively the beneficial owners (as defined in Rule 13d-3 under the 1934 Act) of at least 50% of the outstanding shares of Common Stock, or (iv) consummate a share purchase agreement or other
business combination (including, without limitation, a reorganization, recapitalization, spin-off or scheme of arrangement) with one or more Subject Entities whereby such Subject Entities, individually or in the aggregate, acquire,

  
 - 18 - 

 
either (x) at least 50% of the outstanding shares of Common Stock, (y) at least 50% of the outstanding shares of Common Stock calculated as if any shares of Common Stock held by all the
Subject Entities making or party to, or Affiliated with any Subject Entity making or party to, such stock purchase agreement or other business combination were not outstanding; or (z) such number of shares of Common Stock such that the Subject
Entities become collectively the beneficial owners (as defined in Rule 13d-3 under the 1934 Act) of at least 50% of the outstanding shares of Common Stock, or (v) reorganize, recapitalize or reclassify its Common Stock, (B) that the
Company shall, directly or indirectly, including through Subsidiaries, Affiliates or otherwise, in one or more related transactions, allow any Subject Entity individually or the Subject Entities in the aggregate to be or become the “beneficial
owner” (as defined in Rule 13d-3 under the 1934 Act), directly or indirectly, whether through acquisition, purchase, assignment, conveyance, tender, tender offer, exchange, reduction in outstanding shares of Common Stock, merger, consolidation,
business combination, reorganization, recapitalization, spin-off, scheme of arrangement, reorganization, recapitalization or reclassification or otherwise in any manner whatsoever, of either (x) at least 50% of the aggregate ordinary voting
power represented by issued and outstanding Common Stock, (y) at least 50% of the aggregate ordinary voting power represented by issued and outstanding Common Stock not held by all such Subject Entities as of the Subscription Date calculated as
if any shares of Common Stock held by all such Subject Entities were not outstanding, or (z) a percentage of the aggregate ordinary voting power represented by issued and outstanding shares of Common Stock or other equity securities of the
Company sufficient to allow such Subject Entities to effect a statutory short form merger or other transaction requiring other shareholders of the Company to surrender their shares of Common Stock without approval of the shareholders of the Company
or (C) directly or indirectly, including through Subsidiaries, Affiliates or otherwise, in one or more related transactions, the issuance of or the entering into any other instrument or transaction structured in a manner to circumvent, or that
circumvents, the intent of this definition in which case this definition shall be construed and implemented in a manner otherwise than in strict conformity with the terms of this definition to the extent necessary to correct this definition or any
portion of this definition which may be defective or inconsistent with the intended treatment of such instrument or transaction. 

(n) “Group” means a “group” as that term is used in Section 13(d) of the 1934 Act and as defined in
Rule 13d-5 thereunder. 
 (o) “Options” means any rights, warrants or options to subscribe for or purchase
shares of Common Stock or Convertible Securities. 
 (p) “Parent Entity” of a Person means an entity that,
directly or indirectly, controls the applicable Person, including such entity whose common shares or common stock or equivalent equity security is quoted or listed on an Eligible Market (or, if so elected by the Holder, any other market, exchange or
quotation system), or, if there is more than one such Person or such entity, the Person or such entity designated by the Holder or in the absence of such designation, such Person or entity with the largest public market capitalization as of the date
of consummation of the Fundamental Transaction. 

  
 - 19 - 

 (q) “Person” means an individual, a limited liability company, a
partnership, a joint venture, a corporation, a trust, an unincorporated organization, any other entity and a government or any department or agency thereof. 

(r) “Principal Market” means The NASDAQ Capital Market. 

(s) “Reverse Stock Split” shall have the meaning ascribe to such term in the Securities Purchase Agreement.

 (t) “Securities Purchase Agreement” means the Securities Purchase Agreement, dated as of February 23,
2015, by and among the Company and the investors named on the Schedule of Buyers attached thereto. 
 (u) “Subject
Entity” means any Person, Persons or Group or any Affiliate or associate of any such Person, Persons or Group. 
 (v)
“Successor Entity” means one or more Person or Persons (or, if so elected by the Holder, the Company or Parent Entity) formed by, resulting from or surviving any Fundamental Transaction or one or more Person or Persons (or, if so
elected by the Holder, the Company or the Parent Entity) with which such Fundamental Transaction shall have been entered into. 

(w) “Trading Day” means any day on which the Common Stock is traded on the Principal Market, or, if the Principal
Market is not the principal trading market for the Common Stock, then on the principal securities exchange or securities market on which the Common Stock is then traded; provided that “Trading Day” shall not include any day on which
the Common Stock is scheduled to trade on such exchange or market for less than 4.5 hours or any day that the Common Stock is suspended from trading during the final hour of trading on such exchange or market (or if such exchange or market does not
designate in advance the closing time of trading on such exchange or market, then during the hour ending at 4:00:00 p.m., New York time). 

(x) “Warrant Share Number” means
            (            ). 

[Signature Page Follows] 

  
 - 20 - 

 IN WITNESS WHEREOF, the Company has caused this Warrant to Purchase Common Stock to be
duly executed as of the Issuance Date set out above. 
  

			
	REAL GOODS SOLAR, INC.
		
	By:		  

	Name:		
	Title:		

 EXHIBIT A 

EXERCISE NOTICE 
 TO BE
EXECUTED BY THE REGISTERED HOLDER TO EXERCISE THIS 
 WARRANT TO PURCHASE COMMON STOCK 

REAL GOODS SOLAR, INC. 

The undersigned holder hereby exercises the right to purchase             of the
shares of Common Stock (“Warrant Shares”) of Real Goods Solar, Inc., a Colorado corporation (the “Company”), evidenced by the attached Series
            Warrant to purchase Common Stock No.             (the “Warrant”). Capitalized terms used herein and
not otherwise defined shall have the respective meanings set forth in the Warrant. 
 1. Form of Exercise Price. The holder intends that
payment of the Exercise Price shall be made as: 

                    
a “Cash Exercise” with respect to                      Warrant Shares; or 

                    
a “Cashless Exercise” with respect to                      Warrant Shares. 

2. Payment of Exercise Price. In the event that the holder has elected a Cash Exercise with respect to some or all of the Warrant Shares to be
issued pursuant hereto, the holder shall pay the Aggregate Exercise Price in the sum of $            to the Company in accordance with the terms of the Warrant. 

3. Delivery of Warrant Shares. The Company shall deliver to the holder
            Warrant Shares in accordance with the terms of the Warrant. 
 Please issue the
Warrant Shares in the following name and to the following account: 
  

			
	             Issue to:  
		
                         
                                         
                                         
                                         
                                         
                              

		
			                                      
                                         
                                         
                                         
                                         
                 
		
			                                      
                                         
                                         
                                         
                                         
                 

  

			
	 Facsimile Number

and Electronic Mail:
		  

 
			
		
	 Authorization:
		  

 
			
		
	 By:
		  

 
			
		
	 Title:
		  

			
		
	 Dated:
		  

			
	Broker Name:		  

		
	Broker DTC #:		  

		
	Broker Telephone #:		  

		
	Account Number:		  

	    (if electronic book entry transfer)

 
			
		
	Transaction Code Number:		  

	    (if electronic book entry transfer)EX-4.3

 EXHIBIT 4.3 

WAIVER AND AMENDMENT AGREEMENT 

THIS WAIVER AND AMENDMENT AGREEMENT (this “Agreement”) is made and entered into as of March 31 2015 (the
“Execution Date”), by and among Real Goods Solar, Inc., a Colorado corporation (the “Company”), and the undersigned investor (the “Holder”). Capitalized terms used but not defined herein shall have
the meanings set forth in the Securities Purchase Agreement (as defined in the Recitals below). 
 RECITALS: 

WHEREAS, reference is made to that certain Securities Purchase Agreement dated as of February 23, 2015, by and among the Company and the
Holder (the “Securities Purchase Agreement”), and the five (5) series of Warrants to purchase shares of the Company’s Class A common stock, par value $0.0001 per share (the “Common Stock”) issued to
the Holder pursuant thereto (collectively, the “Warrants”); 
 WHEREAS, the Company has proposed that the Holder waive the
Authorized Shares Increase Amendment; and 
 WHEREAS, the Holder constitutes the Required Holders under each of the Securities Purchase
Agreement and each series of Warrants. 
 NOW, THEREFORE, in consideration of the foregoing recitals and the mutual agreements herein
contained and for other good and valuable consideration, the parties hereto agree as follows: 
  

	 	A.	WAIVER AND AMENDMENTS; RATIFICATIONS; CONFLICTS; RESERVATION OF RIGHTS. 

  

	 	(1)	Waivers and Amendments. 

 (a) The Holder agrees that, notwithstanding Section 4(p)
of the Securities Purchase Agreement, the Company shall not be required to seek approval of the Authorized Shares Increase Resolution by its shareholders and effect the Authorized Shares Increase, provided that the Company’s shareholders
approve the Reverse Stock Split Resolution on or prior to the deadline set forth in the Securities Purchase Agreement and the Company effects a Reverse Stock Split at a ratio of at least one-for-five (a “Specified Reverse Stock
Split”) on or prior to the date that is five (5) Business Days immediately following the Reverse Stock Split Resolution Date (the date the Company effects a Specified Reverse Stock Split, the “Reverse Stock Split
Date”). Accordingly, as of the Reverse Stock Split Date, the Company and the Holder agree that any reference in the Securities Purchase Agreement and any series of Warrant to the Authorized Shares Increase Amendment (and all related defined
terms, including, without limitation, Authorized Shares Increase Resolution and Authorized Shares Increase Resolution Date) shall be disregarded and any condition providing for the occurrence of the Authorized Share Increase Amendment (including,
without limitation, obtaining the Authorized Shares Increase Resolution) shall be deemed satisfied. 

 (b) In addition, the Company agrees for the benefit of the Holder and the Retail Investors that,
notwithstanding anything to the contrary in the Transaction Documents, (i) within five (5) Business Days after the Reverse Stock Split Date, the Company shall reserve out of its authorized and unissued Common Stock at least a number of
shares of Common Stock equal to the greater of (A) the difference obtained by subtracting from (1) 300,000,000 shares of Common Stock (as adjusted for any stock dividend, stock split, stock combination, reclassification or similar
transaction occurring on or after the Execution Date), (2) the number of shares of Common Stock issued to the Holder and/or any Retail Investor prior to the Execution Date (as adjusted for any stock dividend, stock split, stock combination,
reclassification or similar transaction occurring on or after the Execution Date) and (B) such greater number of shares of Common Stock determined by taking into account the Maximum Eligibility Number (as defined in each of the Series B
Warrants, the Series C Warrants and the Series D Warrants, without giving effect to the proviso set forth in such definitions), in order to effect the exercise of all of the outstanding Warrants and (ii) to the extent the Registration Statement
does not, at any time, cover a sufficient number of shares of Common Stock issuable upon exercise in full of the Warrants then outstanding (without any regard to any limitation or restriction on the exercise of Warrants set forth therein and without
taking into account the proviso set forth in the definition of “Maximum Eligibility Number” in any of the Warrants), the Company shall promptly amend or supplement the Registration Statement or, if necessary, file a new registration
statement in order to register such number of Warrant Shares not covered by the Registration Statement. 
 (2) Ratifications. Except
as otherwise expressly provided herein, the Securities Purchase Agreement, each Warrant and each other Transaction Document, are, and shall continue to be, in full force and effect and is hereby ratified and confirmed in all respects, except that on
and after the Closing Date (i) all references in the Securities Purchase Agreement to “this Agreement”, “hereto”, “hereof”, “hereunder” or words of like import referring to the Securities Purchase
Agreement shall mean the Securities Purchase Agreement as amended by this Agreement, (ii) all references in any of the Warrants to “this Warrant”, “hereto”, “hereof”, “hereunder” or words of like import
referring to such Warrants shall mean such Warrants as amended by this Agreement, and (iii) all references in the other Transaction Documents, to the “Securities Purchase Agreement” and any “Warrant” (and corollary
references to “thereto”, “thereof”, “thereunder” or words of like import referring to the Securities Purchase Agreement and any of the Warrants, respectively) shall mean the Securities Purchase Agreement and such
Warrant as amended by this Agreement. Except as expressly set forth herein, this Agreement shall not be deemed to be a waiver, amendment or modification of any provisions of the Warrant, or of any right, power or remedy of the Holder,
or constitute a waiver, amendment or modification of any provision of the Warrant (except to the extent explicitly set forth herein), or any other document, instrument and/or agreement executed or delivered in connection therewith, in each case
whether arising before or after the date hereof or as a result of performance hereunder or thereunder, all of which (except as specified herein) remain in full force and effect. 

 (3) Conflicts. In the event of any conflict between (i) this Agreement and
(ii) the Securities Purchase Agreement and/or the Warrants, this Agreement shall control. 
 (4) Reservation of Rights. Except as
explicitly set forth herein, the Holder reserves all of its rights, remedies, powers, and privileges. 
 B. NO MATERIAL
INFORMATION. The Company hereby agrees and acknowledges that the transactions contemplated by this Agreement does not constitute material, nonpublic information of the Company or any of its Subsidiaries and that the undersigned is not subject to
any confidentiality or similar obligations under any agreement, whether written or oral, between the Company, any of its Subsidiaries or any of their respective officers, directors, Affiliates, employees or agents, on the one hand, and the
undersigned or any of its Affiliates, on the other hand. The Company shall not, and shall cause each of its Subsidiaries and its and each of their respective officers, directors, Affiliates, employees and agents, not to, provide the Holder with any
material, nonpublic information regarding the Company or any of its Subsidiaries from and after the date hereof without the express prior written consent of the Holder. To the extent that the Company, any of its Subsidiaries or any of their
respective officers, directors, Affiliates employees or agents delivers any material, non-public information to the Holder without the Holder’s consent, the Company hereby covenants and agrees that the Holder’s shall not have any duty of
confidentiality to the Company, any of its Subsidiaries or any of their respective officers, directors, Affiliates, employees or agents with respect to, or a duty to the Company, any of its Subsidiaries or any of their respective officers,
directors, Affiliates, employees or agents not to trade on the basis of, such material, non-public information. The Company understands and confirms that the undersigned and its affiliates will rely on the foregoing representations in effecting
transactions in securities of the Company. 
 C. FEES AND EXPENSES. The Company shall reimburse the Holder for its legal
fees and expenses in connection with the preparation and negotiation of this Agreement and transactions contemplated thereby, by paying any such amount to Schulte Roth & Zabel LLP (the “Holder Counsel Expense”) by wire
transfer of immediately available funds in accordance with the written instructions of Schulte Roth & Zabel LLP delivered to the Company on or prior to the fifth (5th) Business Day
immediately following the Execution Date. The Holder Counsel Expense shall be paid by the Company whether or not the transactions contemplated by this Agreement are consummated. Except as otherwise set forth above, each party shall pay the fees and
expenses of its advisers, counsel, accountants and other experts, if any, and all other expenses incurred by such party incident to the negotiation, preparation, execution, delivery and performance of this Agreement. The Company shall pay all stamp
and other taxes and duties levied in connection with the transactions contemplated hereby, if any 
 D. MISCELLANEOUS. This Agreement
may be executed in two or more identical counterparts, all of which shall be considered one and the same agreement and shall become effective when counterparts have been signed by each party and delivered to the other party; provided that a
facsimile signature shall be considered due execution and shall be binding upon  

 
the signatory thereto with the same force and effect as if the signature were an original, not a facsimile signature. In the event that any provision of this Agreement is found to be void or
invalid, then such provision shall be deemed to be severable from the remaining provisions of this Agreement, and it shall not affect the validity of the remaining provisions, which provisions shall be given full effect as if the void or invalid
provision had not been included herein. The terms and provisions of this Agreement shall inure to the benefit of and be binding upon the heirs, successors and assigns of the parties. This Agreement shall be governed by, and construed in accordance
with, the laws of the State of New York (without giving effect to the conflict of laws principles thereof). The courts of the State of New York shall have exclusive jurisdiction to resolve any and all disputes that may arise under this Agreement.
Any amendments or modifications hereto must be executed in writing by all parties. Each party hereto shall do and perform, or cause to be done and performed, all such further acts and things, and shall execute and deliver all such other agreements,
certificates, instruments and documents, as any other party may reasonably request in order to carry out the intent and accomplish the purposes of this letter agreement. 

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

			
	COMPANY:
	
	REAL GOODS SOLAR, INC.
		
	By:		 /s/ Dennis Lacey

	Name:		Dennis Lacey
	Title:		Chief Executive Officer

 [Signature Page to Waiver and Amendment Agreement] 

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

			
	HOLDER:		
	
	_______________________________________.
		
	By:		  

	Name:		  

	Title:		  

 [Signature Page to Waiver and Amendment Agreement]

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