Document:

Warrant - Horizon Technology Finance Corporation

 Exhibit 4.5 
 THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED OR ANY STATE SECURITIES LAWS. NO SALE OR DISPOSITION MAY BE EFFECTED WITHOUT (i) EFFECTIVE REGISTRATION STATEMENTS
RELATED THERETO, (ii) AN OPINION OF COUNSEL OR OTHER EVIDENCE, REASONABLY SATISFACTORY TO THE COMPANY, THAT SUCH REGISTRATIONS ARE NOT REQUIRED, (iii) RECEIPT OF NO-ACTION LETTERS FROM THE APPROPRIATE GOVERNMENTAL AUTHORITIES, OR
(iv) OTHERWISE COMPLYING WITH THE PROVISIONS OF SECTION 7 OF THIS WARRANT. 
 ENPHASE ENERGY, INC. 

WARRANT TO PURCHASE OF SHARES 
 OF SERIES PREFERRED STOCK 
 THIS CERTIFIES THAT, for value received, HORIZON
TECHNOLOGY FINANCE CORPORATION and its assignees are entitled to subscribe for and purchase that number of the fully paid and nonassessable shares of Series Preferred stock (as adjusted pursuant to Section 4 hereof, the “Shares”) of
ENPHASE ENERGY. INC., a Delaware corporation ( the “Company”), as is determined pursuant to the next paragraph hereof at the price per share as is determined pursuant to the next paragraph hereof (such price and such other price as shall
result, from time to time, from the adjustments specified in Section 4 hereof is herein referred to as the “Warrant price”), subject to the provisions and upon the terms and conditions hereinafter set forth. As used therein, (a) the term
“Series Preferred” shall mean either (i) the Company’s Series E Preferred Stock and any stock into or for which such Series E Preferred Stock may hereafter be converted or exchanged, and after the automatic conversion of the Series E
Preferred Stock to Common Stock, shall mean the Company’s Common Stock or (ii) if the Company completes a Qualified Financing (as defined below) within ninety (90) days after the Date of Grant, the series of convertible preferred
stock sold by the Company in such offering (the “Next Round Preferred Stock”), and after the automatic conversion of the Next Round Preferred stock to Common Stock, shall mean the Company’s Common Stock, as applicable, and (b) the
term “Date of Grant” shall mean March 25, 2011. The term “Warrant” as used herein shall be deemed to include any warrant issued upon transfer or partial exercise of or in lieu of this Warrent, unless the context clearly requires
otherwise. 
 The Warrant price shall be (i) $0.68 per share for each share of the Company’s Series E Preferred stock,
or the Common Stock into which such Series E Preferred Stock is converted, which is purchased hereunder, or (ii) the lowest effective price per share (on a common stock equivalent basis and taking into account any securities issued together with the
Next Round Preferred Stock) at which shares of the Next Round Preferred Stock are sold in a Qualified Financing, for each share of Next Round Preferred Stock which is purchased hereunder. A “Qualified Financing” shall mean the sale of the
convertible preferred stock of the Company to purchase which include venture capital investors in an aggregate cash amount not less than $15,000,000. The number of Shares for which this Warrant is exercisable shall be determined as follows:

 a) In the event the Company does not complete a Qualified Financing within
ninety (90) days after the Date of Grant, the holder shall be entitled to purchase Four Hundred Forty One Thousand One Hundred Seventy Seven (441,177) shares of the Company’s Series E Preferred Stock; 

b) If the Company completes a Qualified Financing within fourteen (14) days after the Date of Grant, the holder shall
be entitled to purchase the nearest whole number of shares of Next Round Preferred Stock determined by dividing Three Hundred Thousand and 00/100 Dollars ($300,000) by the lowest effective price per share (on a common stock equivalent basis and
taking into account any securities issued together with the Next Round Preferred Stock) at which shares of the Next Round Preferred Stock are sold in such Qualified Financing; or 

c) If the Company completes a Qualified Financing more than fourteen (14) days after the Date of Grant, but on or
prior to ninety (90) days after the Date of Grant, the holder shall be entitled to purchase Two Hundred Twenty Thousand Five Hundred Eighty-Eight (220,588) shares of Series E Preferred Stock plus the nearest whole number of shares of Next Round
Preferred Stock determined by dividing One Hundred Fifty Thousand Dollars ($150,000) by lowest effective price per share (on a common stock equivalent basis and taking into account any securities issued together with the Next Round Preferred Stock)
at which shares of the Next Round Preferred stock are sold in such Qualified Financing. 
 1. Term. The purchase right
represented by this Warrant is exercisable, in whole or in part, at any time and from time to time from the Date of Grant through the later of (i) ten (10) years after the Date of Grant or (ii) five (5) years after the closing of the
Company’s initial public offering of its Common Stock (“IPO”) effected pursuant to a Registration Statement on Form S-1 (or its successor) filed under the Securities Act of 1933, as amended (the “Act”). 

2. Method of Exercise: Payment: Issuance of New Warrant. Subject to Section 1 hereof, the purchase right represented by this
Warrant may be exercised by the holder hereof, in whole or in part and from time to time at the election of the holder hereof, by (a) the surrender of this Warrant (with the notice of exercise substantially in the form attached hereto as
Exhibit A-1 duly completed and executed) at the principal office of the Company and by the payment to the Company, by certified or bank check, or by wire transfer to an account designated by the Company (a “Wire Transfer”) of an amount
equal to the then applicable Warrant Price multiplied by the number of Shares then being purchased; (b) if in connection with a registered public offering of the Company’s securities the surrender of this Warrant (with the notice of exercise
form attached hereto as Exhibit A-2 duly completed and executed) at the principal office of the Company together with notice of arrangements reasonably satisfactory to the Company for payment to the Company either by certified or bank check or by
Wire Transfer from the proceeds of the sale of shares to be sold by the holder in such public offering of an amount equal to the then applicable Warrant Price per share multiplied by the number of Shares then being purchased; or (c) exercise of
the “net issuance” right provided for in Section 10.2 hereof. The person or persons in whose name(s) any certificate(s) representing shares of Series Preferred shall be issuable upon exercise of this Warrant shall be deemed to have become
the holder(s) of record of, and shall be treated for all purposes as the record 

 
holder(s) of, the shares represented thereby (and such shares shall be deemed to have been issued) immediately prior to the close of business on the date or dates upon which this Warrant is
exercised. In the event of any exercise of the rights represented by this Warrant, certificates for the shares of stock so purchased shall be delivered to the holder hereof as soon as possible and in any event within thirty (30) days after such
exercise and, unless this Warrant has been fully exercised or expired, a new Warrant representing the portion of the Shares, if any, with respect to which this Warrant shall not then have been exercised shall also be issued to the holder hereof as
soon as possible and in any event within such thirty-day period; provided, however, at such time as the Company is subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, if requested by the holder of this Warrant,
the Company shall cause its transfer agent to deliver the certificate representing Shares issued upon exercise of this Warrant to a broker or other person (as directed by the holder exercising this Warrant) within the time period required to settle
any trade made by the holder after exercise of this Warrant. 
 3. Stock Fully Paid: Reservation of Shares. All Shares
that may be issued upon the exercise of the rights represented by this Warrant will, upon Issuance pursuant to the terms and conditions herein, be fully paid and nonassessable, and free from preemptive rights and taxes, liens and charges with
respect to the issue thereof. During the period within which the rights represented by this Warrant may be exercised, the Company will at all times have authorized, and reserved for the purpose of the issue upon exercise of the purchase rights
evidenced by this Warrant, a sufficient number of shares of its Series Preferred to provide for the exercise of the rights represented by this Warrant and a sufficient number of shares of its Common Stock to provide for the conversion of the Series
Preferred into Common stock. 
 4. Adjustment of Warrant Price and Number of Shares. The number and kind of securities
purchasable upon the exercise of this Warrant and the Warrant Price shall be subject to adjustment from time to time upon the occurrence events, as follows: 
 (a) Reclassification or Merger. In case of any reclassification or change of securities of the class issuable upon excesses of this Warrant (other than a change in par value, or from par value to
no par value, or from no par value to par value, or as a result of a subdivision or combination), or in case of any merger of the Company with or into another corporation (other than a merger with another corporation in which the Company is the
acquiring and the surviving corporation and which does result in any reclassification or change of outstanding securities issuable upon exercise of this Warrant), or in case of any sale of all or substantially all of the assets of the Company, the
Company, or such successor or purchasing corporation, as the case may be, shall duly execute and deliver to the holder of this Warrant a new Warrant (in form and substance satisfactory to the holder of this Warrant), so that the holder of this
Warrant shall have the right to receive upon exercise of this Warrant, at a total purchase price not to exceed that payable upon the exercise of the unexercised portion of this Warrant, and in lieu of the shares of Series Preferred therefore
issuable upon exercise of this Warrant, (i) the kind and amount of shares of stock, other securities, money and property receivable upon such reclassification, change, merger or sale by a holder of the number of shares of Series Preferred then
purchasable under this Warrant, or (ii) in the case of such a merger or sale in which the consideration paid consists all or in part of assets other than securities of the successor or purchasing corporation, at the option of the holder of this
Warrant, 

 
the securities of the successor or purchasing corporation having a value at the time of the transaction equivalent to the value of the Series Preferred purchasable upon exercise of this Warrant
at the time of the transaction. Any new Warrant shall provide for adjustments that shall be as nearly equivalent as may be practicable to the adjustments provided for in this Section 4. The Provisions of this Section 4(a) shall similarly
apply to successive reclassifications, changes, mergers and sales. 
 (b) Subdivision or Combination of
Shares. If the Company at any time while this Warrant remains outstanding and unexpired shall subdivide or combine its outstanding shares of Series Preferred, the Warrant Price shall be proportionately decreased and the number of Shares issuable
hereunder shall be proportionately increased in the case of a subdivision and the Warrant Price shall be proportionately increased and the number of Shares issuable hereunder shall be proportionately decreased in the case of a combination.

 (c) Stock Dividends and Other Distributions. If the Company at any time while this Warrant is
outstanding and unexpired shall (i) pay a dividend with respect to Series Preferred payable in Series Preferred, then the Warrant Price shall be adjust, from and after the date of determination of shareholders entitled to receive such dividend
or distribution, to that price determined by multiplying the Warrant Price in effect immediately prior to such date of determination by a fraction (A) the numerator of which shall be the total number of shares of Series Preferred outstanding
immediately prior to such dividend or distribution, and (B) the denominator of which shall be the total number of shares of Series Preferred outstanding immediately after such dividend or distribution; or (ii) make any other distribution with
respect to Series Preferred (except any distribution specifically provided for in Section 4(a) and 4(b)), then, in each such case, provision shall be made by the Company such that the holder of this Warrant shall receive upon exercise of this
Warrant a proportionate share of any such dividend or distribution as though it were the holder of the Series Preferred (or Common Stock issuable upon conversion thereof) as of the record date fixed for the determination of the shareholders of the
Company entitled to receive such dividend or distribution. 
 (d) Adjustment of Number of Shares. Upon
each adjustment in the Warrant Price, the number of Shares of Series Preferred purchasable hereunder shall be adjusted, to the nearest whole share, to the product obtained by multiplying the number of Shares purchasable immediately prior to such
adjustment in the Warrant Price by a fraction, the numerator of which shall be the Warrant Price immediately prior to such adjustment and the denominator of which shall be the Warrant Price immediately thereafter. 

(e) Antidilution Rights. The other antidilution rights applicable to the Shares of Series Preferred purchasable
hereunder are set forth in the Company’s Certificate of Incorporation, as amended from time to time (the “Charter”). Such antidilution rights shall not be restated, amended, modified or waived in any manner that treats the holder
hereof adversely to other holders of the class and series of the Company’s capital stock for which this Warrant is exerciseable without such holder’s prior written consent. The Company shall promptly provide the holder hereof with any
restatement, amendment, modification or waiver of the Charter promptly after the same has been made. 

 5. Notice of Adjustments. Whenever the Warrant Price or the
number of Shares purchasable hereunder shall be adjusted pursuant to Section 4 hereof, the Company shall make a
certificate signed by its chief financial officer setting
forth, in reasonable detail, the event requiring the adjustment, the amount of the adjustment, the method by which such adjustment was calculated, and the Warrant Price and the number of Shares purchasable hereunder after giving effect to such
adjustment, and shall cause copies of such certificate to be mailed (without regard to Section 13 hereof, by first class mail, postage prepaid) to the holder of this Warrant. In addition, whenever the conversion price or conversion ratio of the
Series Preferred shall be adjusted, the Company shall make a certificate signed by its chief financial officer setting forth, in reasonable detail the event requiring the adjustment, the amount of the adjustment, the method by which such adjustment
was calculated, and the conversion price or ratio of the Series Preferred after giving effect to such adjustment, and shall cause copies of such certificate to be mailed (without regard to Section 13 hereof, by first class mail, postage
prepaid) to the holder of this Warrant. 
 6. Fractional Shares. No fractional shares of Series
Preferred will be issued in connection with any exercise hereunder, but in lieu of such fractional shares the Company shall make a cash payment therefor based on the fair market value of the Series Preferred on the date of exercise as reasonably
determined in good faith by the Company’s Board of Directors. 
 7. Compliance with Act; Disposition of Warrant or
Shares of Series Preferred. 
 (a) Compliance with Act. The holder of this Warrant, by acceptance
hereof, agrees that this Warrant, and the shares of Series Preferred to be issued upon exercise hereof and any common Stock issued upon conversion thereof are being acquired for investment and that such holder will not offer, sell or otherwise
dispose of this Warrant, or any shares of Series Preferred to be issued upon exercise hereof or any Common Stock issued upon conversion thereof except under circumstances which will not result in a violation of the Act or any applicable state
securities laws. Upon exercise of this Warrant, unless the Shares being acquired are registered under the Act and any applicable state securities laws or an exemption from such registration is available, the holder hereof shall confirm in writing
that the shares of Series Preferred so purchased (and any shares of Common Stock issued upon conversion thereof) are being acquired for investment and not with a view toward distribution or resale in violation of the Act and shall confirm such other
matters related thereto as may be reasonably requested by the Company. This Warrant and all shares of Series Preferred issued upon exercise of this Warrant and all shares of Common Stock issued upon conversion thereof (unless registered under the
Act and any applicable state securities laws) shall be stamped or imprinted with a legend in substantially the following form: 
 “THE
SECURITIES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS. NO SALE OR DISPOSITION MAY BE EFFECTED WITHOUT (i) EFFECTIVE REGISTRATION STATEMENTS RELATED THERETO, (ii) AN OPINION OF
COUNSEL OR OTHER EVIDENCE, REASONABLY SATISFACTORY TO THE COMPANY, THAT SUCH REGISTRATIONS ARE NOT REQUIRED, (iii) RECEIPT OF NO-ACTION LETTERS FROM THE APPROPRIATE GOVERNMENTAL AUTHORITIES, OR (iv) OTHERWISE COMPLYING

 
WITH THE PROVISIONS OF SECTION 7 OF THE WARRANT UNDER WHICH THESE SECURITIES WERE ISSUED, DIRECTLY OR INDIRECTLY.” 

Said legend shall be removed by the Company, upon the request of a holder, at such time as the restrictions on the
transfer of the applicable security shall have terminated. In addition, in connection with the issuance of this Warrant, the holder specifically represents to the Company by acceptance of this Warrant as follows: 

(1) The holder is aware of the Company’s business affairs and financial condition, and has acquired information about
the Company sufficient to reach an informed and knowledgeable decision to acquire this Warrant. The holder is acquiring this Warrant for its own account for investment purposes only and not with a view to, or for the resale in connection with, any
“distribution” thereof in violation of the Act. 
 (2) The holder understands that this Warrant has not
been registered under the Act in reliance upon a specific exemption therefrom, which exemption depends upon, among other things, the bona fide nature of the holder’s investment intent as expressed herein. 

(3) The holder further understands that this Warrant must be held indefinitely unless subsequently registered under the
Act and qualified under any applicable state securities laws, or unless exemptions from registration and qualification are otherwise available. The holder is aware of the provisions of Rule 144, promulgated under the Act. 

(4) The holder is an “accredited investor” as such term is defined in Rule 501 of Regulation D promulgated under
the Act. 
 (b) Disposition of Warrant or Shares. With respect to any offer, sale or other disposition of
this Warrant or any shares of Series Preferred acquired pursuant to the exercise of this Warrant prior to registration of such Warrant or shares, the holder hereof agrees to give written notice to the Company prior thereto, describing briefly the
manner thereof, together with a written opinion of such holder’s counsel, or other evidence, if reasonably satisfactory to the Company, to the effect that such offer, sale or other disposition may be effected without registration or
qualification (under the Act as then in effect or any federal or state securities law then in effect) of this Warrant or such shares of Series Preferred or Common Stock and indicating whether or not under the Act certificates for this Warrant or
such shares of Series Preferred to be sold or otherwise disposed of require any restrictive legend as to applicable restrictions on transferability in order to ensure compliance with such law. Upon receiving such written notice and reasonably
satisfactory opinion or other evidence, the Company, as promptly as practicable but no later than fifteen (15) days after receipt of the written notice, shall notify such holder that such holder may sell or otherwise dispose of this Warrant of
such shares of Series Preferred or Common Stock, all in accordance with the terms of the notice delivered to the Company. If a determination has been made pursuant to this Section 7(b) that the opinion of counsel for the holder or other
evidence is not reasonably satisfactory to the Company, the Company shall so notify the holder promptly with details thereof after such determination has been made. Notwithstanding the foregoing, this Warrant or such shares of Series Preferred or
Common Stock may, as to such federal laws, be offered, sold or otherwise disposed of 

 
in accordance with Rule 144 or 144A under the Act, provided that the Company shall have been furnished with such information as the Company may reasonably request to provide a reasonable
assurance that the provisions of Rule 144 or 144A have been satisfied. Each certificate representing this Warrant or the shares of Series Preferred thus transferred (except a transfer pursuant to Rule 144 or 144A) shall bear a legend as to the
applicable restrictions on transferability in order to ensure compliance with such laws, unless in the aforesaid opinion of counsel for the holder such legend is not required in order to ensure compliance with such laws. The Company may issue stop
transfer instructions to its transfer agent in connection with such restrictions. 
 (c) Applicability of
Restrictions. Neither any restrictions of any legend described in this Warrant nor the requirements of Section 7(b) above shall apply in any transfer of, or grant of a security interest in, this Warrant (or the Series Preferred or Common
Stock obtainable upon exercise thereof) or any part hereof (i) to a partner of the holder if the holder is a partnership or to a member of the holder if the holder is a limited liability company, (ii) to a partnership of which the holder is a
partner or to a limited liability company of which the holder is a member, (iii) to any affiliate of the holder if the holder is a corporation, (iv) notwithstanding the foregoing, to any corporation, company, limited liability company, limited
partnership, partnership, or other person owned, managed or sponsored by Horizon Technology Finance Corporation (“HRZN”) or its principals or in which HRZN has an interest, (v) to Horizon Credit ILLC or (vi) to a lender to the holder
or any of the foregoing; provided, however, in any such transfer if applicable, the transferee shall agree in writing to be bound by the terms of this Warrant as if an original holder hereof. 

8. Rights as Shareholders; Information. No holder of this Warrant, as such, shall be entitled to vote or
receive dividends or be deemed the holder of Series Preferred or any other securities of the Company which may at any time be issuable upon the exercise hereof for any purpose, nor shall anything contained herein be construed to confer upon the holder of this Warrant, as such, any of the rights of a
shareholder of the company or any right to vote for the election of directors or upon any matter submitted to shareholders at any meeting thereof, or to receive notice of meetings, or to receive dividends rights or subscription or otherwise until
this Warrant shall have been exercised and the Shares purchasable upon the exercise hereof shall have become deliverable, as provided herein. Notwithstanding the foregoing, the Company will transmit to the holder of this Warrant such information,
documents and reports as are generally distributed to the holders of any class or series of the securities of the Company concurrently with the distribution thereof to the shareholders. 

9. Registration Rights. The Company hereby covenants to make holder a party to the Company’s Amended and Restated Investor
Rights Agreement to be executed subsequent to the Date of Grant (the “Registration Rights Agreement”) to provide holder with registration rights as though the holder were a Holder (as defined therein), with the following exceptions and
clarifications: 
 (1) The holder will not have the right to demand registration, but can otherwise participate
in any registration demanded by others. 
 (2) The holder will be subject to the same provisions regarding
indemnification as contained in the Registration Rights Agreement. 

 (3) The registration rights are freely assignable by the holder of this
Warrant in connection with a permitted transfer of this Warrant or the Shares pursuant to Section 7(c) hereof. 
 10.
Additional Rights. 
 10.1 Acquisition Transactions. The Company shall provide the holder of this Warrant with at
least twenty (20) days’ written notice prior to closing thereof of the terms and conditions of any of the following transactions (to the extent the Company has notice thereof): (i) the sale, lease, exchange, conveyance or other disposition
of all or substantially all of the Company’s property or business, or (ii) its merger into or consolidation with any other corporation (other than a wholly-owned subsidiary of the Company), or any transaction (including a merger or other
reorganization) or series of related transactions, in which more than 50% of the voting power of the Company is disposed of. 

10.2 Right to Convert Warrant into Stock: Net Issuance. 

(a) Right to Convert. In addition to and without limiting the rights of the holder under the terms of this Warrant,
the holder shall have the right to convert this Warrant or any portion thereof (the “Conversion Right”) into shares of Series Preferred as provided in this Section 10.2 at any time or from time to time during the term of this Warrant.
Upon exercise of the Conversion Right with respect to a particular number of shares subject to this Warrant (the “Converted Warrant Shares”), the Company shall deliver to the holder (without payment by the holder of any exercise price or
any cash or other consideration) that number of shares of fully paid and nonassessable Series Preferred as is determined according to the following formula: 
  

					
	 X =
	  	B -A	  	
		  	Y	  	

			
		
	 Where: X =
	  	the number of shares of Series Preferred that shall be issued to holder
		
	               Y =
	  	the fair market value of one share of Series Preferred
		
	               A =
	  	the aggregate Warrant Price of the specified number of Converted Warrant Shares immediately prior to the exercise of the Conversion Right (i.e., the number of Converted
Warrant Shares multiplied by the Warrant Price)
		
	               B =
	  	the aggregate fair market value of the specified number of Converted Warrant Shares (i.e., the number of Converted Warrant Shares multiplied by the fair
market value of one Converted Warrant Share)

 No fractional shares shall be issuable upon exercise of the Conversion Right, and, if the number of
shares to be issued determined in accordance with the foregoing formula is other than a whole number, the Company shall pay to the holder an amount in cash equal to the fair market value of the resulting fractional share on the Conversion Date (as
hereinafter defined). For purposes of 

 
Section 10 of this Warrant, shares issued pursuant to the Conversion Right shall be treated as if they were issued upon the exercise of this Warrant. 

(b) Method of Exercise. The Conversion Right may be exercised by the holder by the surrender of
this Warrant at the principal office of the Company together with a written statement (which may be in the form of Exhibit A-1 or Exhibit A-2 hereto) specifying that the holder thereby intends to exercise the Conversion Right and indicating the
number of shares subject to this Warrant which are being surrendered (referred to in Section 10.2(a) hereof as the Converted Warrant shares) in exercise of the Conversion Right. Such conversion shall be effective upon receipt by the Company of
this Warrant together with the aforesaid written statement, or on such later date as is specified therein (the “Conversion Date”), and, at the election of the holder hereof, may be made contingent upon the closing of the sale of the
Company’s Common Stock to the public in a public offering pursuant to a Registration Statement under the Act (a “ Public offering”). Certificates for the shares issuable upon exercise of the Conversion Right and, if applicable, a new
warrant evidencing the balance of the shares remaining subject to this Warrant, shall be issued as of the Conversion Date and shall be delivered to the holder within thirty (30) days following the Conversion Date. 

(c) Determination of Fair Market value. For purposes of this Section 10.2, “fair market value” of a
share of Series Preferred (or common Stock if the Series Preferred has been automatically converted into Common Stock) as of a particular date (the “Determination Date”) shall mean: 

(i) If the Conversion Right is exercised in connection with and contingent upon a Public Offering, and if the
Company’s Registration Statement relating to such Public Offering (“Registration statement”) has been declared effective by the Securities and Exchange Commission, then the initial “Price to Public” specified in the final
prospectus with respect to such offering. 
 (ii) If the Conversion Right is not exercised in connection with and
contingent upon a Public Offering, then as follows: 
 (A) If traded on a securities exchange, the fair market
value of the Common Stock shall be deemed to be the average of the closing prices of the Common Stock on such exchange over the five trading days immediately prior to the Determination Date, and the fair market value of the Series Preferred shall be
deemed to be such fair market value of the Common Stock multiplied by the number of shares of Common Stock into which each share of Series Preferred is then convertible; 

(B) If traded on the Nasdaq Stock Market or other over-the-counter system, the fair market value of the Common Stock
shall be deemed to be the average of the closing prices of the Common Stock over the five trading days immediately prior to the Determination Date, and the fair market value of the Series Preferred shall be deemed to be such fair market value of the
Common Stock multiplied by the number of shares of Common Stock into which each share of Series Preferred is then convertible; and 

 (C) If there is no public market for the Common Stock, then fair market
value shall be determined by the Board of Directors of the Company in good faith. 
 In making a determination under clauses (A) or
(B) above, if on the Determination Date, five trading days had not passed since the IPO, then the fair market value of the Common Stock shall be the average closing prices or closing bid prices, as applicable, for the shorter period beginning
on and including the date of the IPO and ending on the trading day prior to the Determination Date (or if such period includes only one trading day, the closing price or closing bid price, as applicable, for such trading day). If closing prices or
closing bid prices are no longer, reported by a securities exchange or other trading system, the closing price or closing bid price shall be that which is reported by such securities exchange or other trading system at 4:00 p.m. New York City time
on the applicable trading day. 
 10.3 Exercise Prior to Expiration. To the extent this Warrant is not previously
exercised as to all of the Shares subject hereto, and if the fair market value of one share of the Series Preferred is greater than the Warrant Price then in effect, this Warrant shall be deemed automatically exercised pursuant to Section 10.2
above (even if not surrendered) immediately before its expiration. For purposes of such automatic exercise, the fair market value of one share of the Series Preferred upon such expiration shall be determined pursuant to Section 10.2(c). To the
extent this Warrant or any portion thereof is deemed automatically exercised pursuant to this Section 10.3, the Company agrees to promptly notify the holder hereof of the number of Shares, if any, the holder hereof is to receive by reason of such
automatic exercise. 
 11. Representations and Warranties. The Company represents and warrants to the holder of this
Warrant as follows: 
 (a) This Warrant has been duly authorized and executed by the Company and is a valid and
binding obligation of the Company enforceable in accordance with its terms, subject to laws of general application relating to bankruptcy, insolvency and the relief of debtors and the rules of law or principles at equity governing specific
performance, injunctive relief and other equitable remedies. 
 (b) The Shares have been duly authorized and
reserved for issuance by the Company and, when issued in accordance with the terms hereof, will be validly issued, fully paid and nonassessable and free from preemptive rights. 

(c) The rights, preferences, privileges and restrictions granted to or imposed upon the Series Preferred and the holders
thereof will be as set forth in the Charter. 
 (d) The shares of Common Stock issuable upon conversion of the
Shares have been duly authorized and reserved for issuance by the Company and, when issued in accordance with the terms of the Charter will be validly issued, fully paid and nonassessable. 

(e) The execution and delivery of this Warrant are not, and the issuance of the Shares upon exercise of this Warrant in
accordance with the terms hereof will not be, inconsistent 

 
with the Company’s Charter or by-laws, do not and will not contravene any law, governmental rule or regulation, judgment or order applicable to the Company, and do not and will not conflict
with or contravene any provision of, or constitute a default under, any indenture, mortgage, contract or other
instrument of which the Company is a party or by which it
is bound or require the consent or approval of, the giving of notice to, the registration or filing with or the taking of any action in respect of or by, any Federal, state or local government authority or agency or other person, except for the
filing of notices pursuant to federal and state securities laws, which filings will be effected by the time required thereby. 
 (f) There are no actions, suits, audits, investigations or proceedings pending or, to the knowledge of the Company, threatened against the Company in any court or before any governmental commission, board
or authority which, if adversely determined, could have a material adverse effect on the ability of the Company to perform its obligations under this Warrant. 
 (g) The number of shares of Common Stock of the Company outstanding on the date hereof, on a fully diluted basis (assuming the conversion of all outstanding convertible securities and the exercise of all
outstanding options and warrants), does not exceed 310,000,000 shares. 
 12. Modification and Waiver. This Warrant and
any provision hereof may be changed, waived, discharged or terminated only by an instrument in writing signed by the party against which enforcement of the same is sought. 
 13. Notices. Any notice, request, communication or other document required or permitted to be given or delivered to the holder hereof or the Company shall be delivered, or shall be sent by
certified or registered mail, postage prepaid, to each such holder at its address as shown on the books of the Company or to the Company at the address indicated therefor on the signature page of this Warrant. 

14. Binding Effect on Successors. This Warrant shall be binding upon any corporation succeeding the Company be merger,
consolidation or acquisition of all or substantially all of the Company’s assets, and all of the obligations of the Company relating to the Series Preferred issuable upon the exercise or conversion of this Warrant shall survive the exercise,
conversion and termination of this Warrant and all of the covenants and agreements of the Company shall inure to the benefit of the successors and assigns of the holder hereof. 

15. Lost Warrants or Stock Certificates. The Company covenants to the holder hereof that, upon receipt of evidence reasonably
satisfactory to the Company of the loss, theft, destruction or mutilation of this Warrant or any stock certificate and, in the case of any such loss, theft or destruction, upon receipt of an indemnity reasonably satisfactory to the Company, or in
the case of any such mutilation upon surrender and cancellation of such Warrant or stock certificate, the Company will make and deliver a new Warrant or stock certificate, of like tenor, in lieu of the lost, stolen, destroyed or mutilated Warrant or
stock certificate. 
 16. Descriptive Headings. The descriptive headings of the various Sections of this Warrant are
inserted for convenience only and do not constitute a part of this Warrant. The language 

 
in this Warrant shall be construed as to its fair meaning without regard to which party drafted this Warrant. 
 17. Governing Law. This Warrant shall be construed and enforced in accordance with, and the rights of the parties shall be governed by, the laws of the State of Delaware. 

18. Survival of Representations, Warranties and Agreements. All representations and warranties of the Company and the holder
hereof contained herein shall survive the Date of Grants the exercise or conversion of this Warrant (or any part hereof) or the termination or expiration of rights hereunder. All agreements of the Company and the holder hereof contained herein shall
survive indefinitely until, by their respective terms, they are no longer operative. 
 19. Remedies. In case any one or
more of the covenants and agreements contained in this Warrant shall have been breached, the holders hereof (in the case of a breach by the Company), or the Company (in the case of a breach by a holder), may proceed to protect and enforce their or
its rights either by suit in equity and/or by action at law, including, but not limited to, an action for damages as a result of any such breach and/or an action for specific performance of any such covenant or agreement contained in this Warrant.

 20. No Impairment of Rights. The Company will not, by amendment of its Charter or through any other means, avoid or
seek to avoid the observance or performance of any of the terms of this Warrant, but will at all times in good faith assist in the carrying out of all such terms and in the taking of all such action as may be necessary or appropriate in order to
protect the rights of the holder of this Warrant against impairment. 
 21. Severability. The invalidity or
unenforceability of any provision of this Warrant in any jurisdiction shall not affect the validity or enforceability of such provision in any other jurisdiction, or affect any other provision of this Warrant, which shall remain in full force and
effect. 
 22. Recovery of Litigation Costs. If any legal action or other proceeding is brought for the enforcement of
this Warrant, or because of an alleged dispute, breach, default, or misrepresentation in connection with any of the provisions of this Warrant, the successful or prevailing party or parties shall be entitled to recover reasonable attorneys’
fees and other costs incurred in that action or proceeding, in addition to any other relief to which it or they may be entitled. 
 23. Entire Agreement Modification. This Warrant constitutes the entire agreement between the parties pertaining to the subject matter contained in it and supersedes all prior and contemporaneous
agreement, representations, and undertakings of the parties, whether oral or written, with respect to such subject matter. 

[Remainder of page intentionally blank. Signature page follows] 

 The Company has caused this Warrant to be duly executed and delivered as of the Date of
Grant specified above. 
  

			
	ENPHASE ENERGY, INC.
		
	By:	 	/s/ Paul Nahi
	Name:	 	Paul Nahi
	Title:	 	President & Chief Executive Office

 

			
	Address:	 	    201 1st Street, Suite 300
		 	    Petaluma, CA 94952

 EXHIBIT A-1 
 NOTICE OF EXERCISE 
  

	To:	ENPHASE ENERGY, INC. (the “Company”) 

 1. The undersigned hereby: 
  

	 	 ̈	elects to purchase              shares of [Series Preferred Stock] [Common Stock] of the Company
pursuant to the terms of the attached Warrant, and tenders herewith payment of the purchase price of such shares in full, or 

  

	 	 ̈	 elects to exercise its net issuance rights pursuant to Section 10.2 of the attached Warrant with respect
to             Shares of [Series Preferred Stock] [Common Stock]. 

 2. Please
issue a certificate or certificates representing              shares in the name of the undersigned or in such other name or names as are specified below: 

 

					
		 	 	  	
		 	(Name)	  	
			
		 	 	  	
			
		 	 	  	
		 	(Address)	  	

 3. The undersigned represents that the aforesaid shares are being acquired for the account of the
undersigned for investment and not with a view to, or for resale in connection with, the distribution thereof and that the undersigned has no present intention of distributing or reselling such shares, all except as in compliance with applicable
securities laws. 
  

	
	  
	(Signature)

  

			
	 	  	
	(Date)	  	

 EXHIBIT A-2 
 NOTICE OF EXERCISE 
  

	To:	ENPHASE ENERGY, INC. (the “Company”) 

 1. Contingent upon and effective immediately prior to the closing (the “Closing”) of the Company’s public offering contemplated by the Registration Statement on Form
S        , filed             , 200    , the undersigned hereby: 

 

	 	 ̈	elects to purchase              shares of [Series Preferred Stock] [Common Stock] of the Company (or
such lesser number of shares as may be sold on behalf of the undersigned at the Closing) pursuant to the terms of the attached Warrant, or 

  

	 	 ̈	elects to exercise its net issuance rights pursuant to Section 10.2 of the attached Warrant with respect to
             Shares of [Series Preferred Stock] [Common Stock]. 

 2. Please deliver to the custodian for the selling shareholders a stock certificate representing such              shares. 

3. The undersigned has instructed the custodian for the selling shareholders to deliver to the Company
$             or, if less, the net proceeds due the undersigned from the sale of shares in the aforesaid public offering. If such net proceeds are less than the purchase price for
such shares, the undersigned agrees to deliver the difference to the Company prior to the Closing. 
  

	
	  
	(Signature)

  

			
	 	  	
	(Date)Warrant - Hercules Technology Growth Capital, Inc.

 Exhibit 4.6 
 EXECUTION VERSION 
 THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
1933, AS AMENDED, OR ANY STATE SECURITIES LAWS. THEY MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED, OR HYPOTHECATED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL (WHICH MAY BE COMPANY COUNSEL) REASONABLY
SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY APPLICABLE STATE SECURITIES LAWS. 
 WARRANT AGREEMENT 
 To Purchase Shares of Preferred Stock of 

ENPHASE ENERGY, INC. 
 Dated as of June 13, 2011 (the “Effective Date”) 
 WHEREAS,
ENPHASE ENERGY, INC., a Delaware corporation (the “Company”), has entered into a Loan and Security Agreement of even date herewith (the “Loan Agreement”) with Hercules Technology Growth Capital, Inc., a Maryland
corporation (the “Warrantholder”); 
 WHEREAS, the Company desires to grant to Warrantholder, in consideration
for, among other things, the financial accommodations provided for in the Loan Agreement, the right to purchase shares of Preferred Stock (as defined below) pursuant to this Warrant Agreement (the “Agreement”); 

NOW, THEREFORE, in consideration of the Warrantholder executing and delivering the Loan Agreement and providing the financial
accommodations contemplated therein, and in consideration of the mutual covenants and agreements contained herein, the Company and Warrantholder agree as follows: 
 SECTION 1. GRANT OF THE RIGHT TO PURCHASE PREFERRED STOCK. 
 For value
received, the Company hereby grants to the Warrantholder, and the Warrantholder is entitled, upon the terms and subject to the conditions hereinafter set forth, to subscribe for and purchase, from the Company, up to $225,000 of fully paid and
non-assessable shares of the Preferred Stock at the Exercise Price (as defined below). As used herein, the following terms shall have the following meanings: 
 “1934 Act” has the meaning given to it in Section 10(d). 

“Acknowledgment of Exercise” has the meaning given to it in Section 3(a). 

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

“Charter” means the Company’s Articles of Incorporation, Certificate of Incorporation or other constitutional
document, as may be amended from time to time. 
 “Common Stock” means the Company’s common stock, $0.00001
par value per share. 
 “Conversion Price Per Share” means, with respect to a Convertible Debt Financing that is
the Next Financing, the lesser of the (i) the specified amount component of the conversion price as specified in the closing date documentation of such Convertible Debt Financing and (ii) the actual conversion price for such Convertible
Debt Financing as determined on the date of exercise of the Warrant. 

 “Exercise Price” means, (i) if the Next Financing occurs within 30
days of the Effective Date, the purchase price per share or the Conversion Price Per Share, as applicable, of the Next Financing, (ii) if the Next Financing occurs after the 30th day following the Effective Date but prior to the 180th day
following the Effective Date, the average of $0.68 and the purchase price per share or the Conversion Price Per Share, as applicable, of the Next Financing and, (iii) if the Next Financing occurs after the 180th day following the Effective
Date, $0.68. The Exercise Price is subject to adjustment as provided in Section 8. 
 “Initial Public
Offering” means the initial underwritten public offering of the Company’s Common Stock pursuant to a registration statement under the Act, which public offering has been declared effective by the Securities and Exchange Commission
(“SEC”). 
 “Merger Event” means (i) a merger or consolidation involving the Company in
which (x) the Company is not the surviving entity, or (y) the outstanding shares of the Company’s capital stock are otherwise converted into or exchanged for shares of capital of another entity; or (ii) or the sale of all or
substantially all of the assets of the Company. 
 “Net Issuance” has the meaning given to it in
Section 3(a). 
 “Next Financing” means the earliest of (i) the next institutional private equity
financing with gross proceeds of at least $12,000,000, (ii) the next convertible debt financing with gross proceeds of at least $12,000,000 (a “Convertible Debt Financing”), or (iii) the Initial Public Offering.

 “Notice of Exercise” has the meaning given to it in Section 3(a). 

“Preferred Stock” means the Series E Preferred Stock of the Company and any other stock into or for which the Series E
Preferred Stock may be converted or exchanged, and upon and after the occurrence of an event which results in the automatic or voluntary conversion, redemption or retirement of all (but not less than all) of the outstanding shares of such Preferred
Stock, including, without limitation, the consummation of an Initial Public Offering of the Common Stock in which such a conversion occurs, then from and after the date upon which such outstanding shares are so converted, redeemed or retired,
“Preferred Stock” shall mean such Common Stock. 
 “Purchase Price” means, with respect to any
exercise of this Agreement, an amount equal to the Exercise Price as of the relevant time multiplied by the number of shares of Preferred Stock requested to be exercised under this Agreement pursuant to such exercise. 

“Transfer Notice” has the meaning given to it in Section 11. 

“Warrant” has the meaning given to it in Section 2. 
 In addition, capitalized terms used herein but not otherwise defined herein shall have the meaning assigned to such terms in the Loan Agreement. 
 SECTION 2. TERM OF THE AGREEMENT. 
 Except as otherwise provided for
herein, the term of this Agreement and the right to purchase Preferred Stock as granted herein (the “Warrant”) shall commence on the Effective Date and shall be exercisable for a period ending upon the later to occur of (i) ten
(10) years from the Effective Date; or (ii) five (5) years after the Initial Public Offering. 

  
 2

 SECTION 3. EXERCISE OF THE PURCHASE RIGHTS. 

(a) Exercise. The purchase rights set forth in this Agreement are exercisable by the Warrantholder, in whole or in part, at any
time, or from time to time, prior to the expiration of the term set forth in Section 2, by tendering to the Company at its principal office a notice of exercise in the form attached hereto as Exhibit I (the “Notice of
Exercise”), duly completed and executed. Promptly upon receipt of the Notice of Exercise and the payment of the Purchase Price in accordance with the terms set forth below, and in no event later than three (3) days thereafter, the
Company shall issue to the Warrantholder a certificate for the number of shares of Preferred Stock purchased and shall execute the acknowledgment of exercise in the form attached hereto as Exhibit II (the “Acknowledgment of
Exercise”) indicating the number of shares which remain subject to future purchases, if any. 
 The Purchase Price may
be paid at the Warrantholder’s election either (i) by cash or check, or (ii) by surrender of all or a portion of the Warrant for shares of Preferred Stock to be exercised under this Agreement and, if applicable, an amended Agreement
representing the remaining number of shares purchasable hereunder, as determined below (“Net Issuance”). If the Warrantholder elects the Net Issuance method, the Company will issue Preferred Stock in accordance with the following
formula: 
  

									
		  				  	 X = Y(A-B)
  A

			
	 Where:
	  	 	X =	  	  	the number of shares of Preferred Stock to be issued to the Warrantholder.
				
		  				  	Y =	  	the number of shares of Preferred Stock requested to be exercised under this Agreement.
				
		  				  	A =	  	the fair market value of one (1) share of Preferred Stock at the time of issuance of such shares of Preferred Stock.
			
		  	 	B =	  	  	the Exercise Price.

 For purposes of the above calculation, current fair market value of Preferred Stock shall mean with
respect to each share of Preferred Stock: 
 (i) if the exercise is in connection with an Initial Public
Offering, and if the Company’s registration statement relating to such Initial Public Offering has been declared effective by the SEC, then the fair market value per share shall be the product of (x) the initial “Price to Public”
of the Common Stock specified in the final prospectus with respect to the offering and (y) the number of shares of Common Stock into which each share of Preferred Stock is convertible at the time of such exercise; 

(ii) if the exercise is after, and not in connection with an Initial Public Offering, and: 

(A) if the Common Stock is traded on a securities exchange, the fair market value shall be deemed to be the product of
(x) the average of the closing prices over a five (5) day period ending three days before the day the current fair market value of the securities is being determined and (y) the number of shares of Common Stock into which each share
of Preferred Stock is convertible at the time of such exercise; or 
 (B) if the Common Stock is traded
over-the-counter, the fair market value shall be deemed to be the product of (x) the average of the closing bid and asked prices quoted on the NASDAQ system (or similar system) over the five (5)

  
 3

 
day period ending three days before the day the current fair market value of the securities is being determined and (y) the number of shares of Common Stock into which each share of
Preferred Stock is convertible at the time of such exercise; 
 (iii) if at any time the Common Stock is not
listed on any securities exchange or quoted in the NASDAQ National Market or the over-the-counter market, the current fair market value of Preferred Stock shall be the product of (x) the highest price per share which the Company could obtain
from a willing buyer (not a current employee or director) for shares of Common Stock sold by the Company, from authorized but unissued shares, as determined in good faith by its Board of Directors and (y) the number of shares of Common Stock
into which each share of Preferred Stock is convertible at the time of such exercise, unless the Company shall become subject to a Merger Event, in which case the fair market value of Preferred Stock shall be deemed to be the per share value
received by the holders of the Company’s Preferred Stock on a common equivalent basis pursuant to such Merger Event. 

Upon partial exercise by either cash or Net Issuance, the Company shall promptly issue an amended Agreement representing the remaining
number of shares purchasable hereunder. All other terms and conditions of such amended Agreement shall be identical to those contained herein, including, but not limited to the Effective Date hereof. 

(b) Exercise Prior to Expiration. To the extent this Agreement is not previously exercised as to all Preferred Stock subject
hereto, and if the fair market value of one share of the Preferred Stock is greater than the Exercise Price then in effect, this Agreement shall be deemed automatically exercised pursuant to Section 3(a) (even if not surrendered) immediately
before its expiration. For purposes of such automatic exercise, the fair market value of one share of the Preferred Stock upon such expiration shall be determined pursuant to Section 3(a). To the extent this Agreement or any portion thereof is
deemed automatically exercised pursuant to this Section 3(b), the Company agrees to promptly notify the Warrantholder of the number of shares of Preferred Stock, if any, the Warrantholder is to receive by reason of such automatic exercise.

 SECTION 4. RESERVATION OF SHARES. 
 During the term of this Agreement, the Company will at all times have authorized and reserved a sufficient number of shares of its Preferred Stock to provide for the exercise of the rights to purchase
Preferred Stock as provided for herein, and shall have authorized and reserved a sufficient number of shares of its Common Stock to provide for the conversion of the Preferred Shares available hereunder. 

SECTION 5. NO FRACTIONAL SHARES OR SCRIP. 
 No fractional shares or scrip representing fractional shares shall be issued upon the exercise of the Warrant provided for in this Agreement, but in lieu of such fractional shares the Company shall make a
cash payment therefor upon the basis of the Exercise Price then in effect. 
 SECTION 6. NO RIGHTS AS SHAREHOLDER/STOCKHOLDER.

 This Agreement does not entitle the Warrantholder to any voting rights or other rights as a shareholder/stockholder of the
Company prior to the exercise of this Agreement. 
 SECTION 7. WARRANTHOLDER REGISTRY. 

The Company shall maintain a registry showing the name and address of the registered holder of this Agreement. Warrantholder’s
initial address, for purposes of such registry, is set forth in Section 12(g). Warrantholder may change such address by giving written notice of such changed address to the Company. 

  
 4

 SECTION 8. ADJUSTMENT RIGHTS. 

The Exercise Price and the number of shares of Preferred Stock purchasable hereunder are subject to adjustment, as follows: 

(a) Merger Event. If at any time there shall be a Merger Event, then, as a part of such Merger Event, lawful provision shall be
made so that the Warrantholder shall thereafter be entitled to receive, upon exercise of this Agreement, the kind, amount and value of shares of preferred stock or other securities or property of the successor, surviving or purchasing corporation
resulting from, or participating in, such Merger Event that would have been issuable if Warrantholder had exercised this Agreement immediately prior to the Merger Event. In any such case, appropriate adjustment (as determined in good faith by the
Company’s Board of Directors) shall be made in the application of the provisions of this Agreement with respect to the rights and interests of the Warrantholder after the Merger Event to the end that the provisions of this Agreement (including
adjustments of the Exercise Price) shall be applicable in their entirety, and to the greatest extent possible. Without limiting the foregoing, in connection with any Merger Event, upon the closing thereof, the successor, surviving or purchasing
entity shall assume the obligations of this Agreement. The provisions of this Section 8(a) shall similarly apply to successive Merger Events. In connection with a Merger Event and upon Warrantholder’s written election to the Company, the
Company shall cause this Warrant Agreement to be exchanged for the consideration that Warrantholder would have received if Warrantholder chose to exercise its right to have shares issued pursuant to the Net Issuance provisions of this Warrant
Agreement without actually exercising such right, acquiring such shares and exchanging such shares for such consideration. 

(b) Reclassification of Shares. Except as set forth in Section 8(a), if the Company at any time shall, by combination,
reclassification, exchange or subdivision of securities or otherwise, change any of the securities as to which purchase rights under this Agreement exist into the same or a different number of securities of any other class or classes, this Agreement
shall thereafter represent the right to acquire such number and kind of securities as would have been issuable as the result of such change with respect to the securities which were subject to the purchase rights under this Agreement immediately
prior to such combination, reclassification, exchange, subdivision or other change. 
 (c) Subdivision or Combination of
Shares. If the Company at any time shall combine or subdivide its Preferred Stock, (i) in the case of a subdivision, the Exercise Price shall be proportionately decreased, and the number of shares of Preferred Stock issuable upon exercise
of this Agreement shall be proportionately increased, or (ii) in the case of a combination, the Exercise Price shall be proportionately increased, and the number of shares of Preferred Stock issuable upon the exercise of this Agreement shall be
proportionately decreased. 
 (d) Stock Dividends. If the Company at any time while this Agreement is outstanding and
unexpired shall: 
 (i) pay a dividend with respect to the Preferred Stock payable in Preferred Stock, then the
Exercise Price shall be adjusted, from and after the date of determination of shareholders/stockholders entitled to receive such dividend or distribution, to that price determined by multiplying the Exercise Price in effect immediately prior to such
date of determination by a fraction (A) the numerator of which shall be the total number of shares of Preferred Stock outstanding immediately prior to such dividend or distribution, and (B) the denominator of which shall be the total
number of shares of Preferred Stock outstanding immediately after such dividend or distribution; or 

  
 5

 (ii) make any other distribution with respect to Preferred Stock (or stock
into which the Preferred Stock is convertible), except any distribution specifically provided for in any other clause of this Section 8, then, in each such case, provision shall be made by the Company such that the Warrantholder shall receive
upon exercise or conversion of this Warrant a proportionate share of any such distribution as though it were the holder of the Preferred Stock (or other stock for which the Preferred Stock is convertible) as of the record date fixed for the
determination of the shareholders/stockholders of the Company entitled to receive such distribution. 
 (e) Antidilution
Rights. Additional antidilution rights applicable to the Preferred Stock purchasable hereunder are as set forth in the Company’s Charter and any other applicable shareholders’ rights agreements, and shall be applicable with respect to
the Preferred Stock issuable hereunder. The Company shall promptly provide the Warrantholder with any restatement, amendment, modification or waiver of the Charter or any other applicable shareholders’ rights agreements; provided, that
no such amendment, modification or waiver shall impair or reduce the antidilution rights applicable to the Preferred Stock as of the date hereof unless such amendment, modification or waiver affects the rights of Warrantholder with respect to the
Preferred Stock in the same manner as it affects all other holders of Preferred Stock. The Company shall provide Warrantholder with prior written notice of any issuance of its stock or other equity security to occur after the Effective Date of this
Agreement, which notice shall include (a) the price at which such stock or security is to be sold, (b) the number of shares to be issued, and (c) such other information as necessary for Warrantholder to determine if a dilutive event
has occurred. For the avoidance of doubt, there shall be no duplicate anti-dilution adjustment pursuant to this subsection (e), the forgoing subsection (d) and the Company’s Charter. 

(f) Notice of Adjustments. If: (i) the Company shall declare any dividend or distribution upon its stock, whether in stock,
cash, property or other securities (assuming Warrantholder consents to a dividend involving cash, property or other securities); (ii) the Company shall offer for subscription pro rata to the holders of any class of its Preferred Stock or other
convertible stock any additional shares of stock of any class or other rights; (iii) there shall be any Merger Event; (iv) there shall be an Initial Public Offering; or (v) there shall be any voluntary dissolution, liquidation or
winding up of the Company; then, in connection with each such event, the Company shall send to the Warrantholder: (A) at least thirty (30) days’ prior written notice of the date on which the books of the Company shall close or a
record shall be taken for such dividend, distribution, subscription rights (specifying the date on which the holders of Preferred Stock shall be entitled thereto) or for determining rights to vote in respect of such Merger Event, dissolution,
liquidation or winding up; (B) in the case of any such Merger Event, dissolution, liquidation or winding up, at least thirty (30) days’ prior written notice of the date when the same shall take place (and specifying the date on which
the holders of Preferred Stock shall be entitled to exchange their Preferred Stock for securities or other property deliverable upon such Merger Event, dissolution, liquidation or winding up); and (C) in the case of an Initial Public Offering,
the Company shall give the Warrantholder at least thirty (30) days’ written notice prior to the effective date thereof. 
 Each such written notice shall set forth, in reasonable detail, (i) the event requiring the notice, and (ii) if any adjustment is required to be made, (A) the amount of such adjustment,
(B) the method by which such adjustment was calculated, (C) the adjusted Exercise Price (if the Exercise Price has been adjusted), and (D) the number of shares subject to purchase hereunder after giving effect to such adjustment, and
shall be given by first class mail, postage prepaid, or by reputable overnight courier with all charges prepaid, addressed to the Warrantholder at the address for Warrantholder set forth in the registry referred to in Section 7. 

  
 6

 (g) Timely Notice. Failure to timely provide such notice required by subsection
(f) above shall entitle Warrantholder to retain the benefit of the applicable notice period notwithstanding anything to the contrary contained in any insufficient notice received by Warrantholder. For purposes of this subsection (g), and
notwithstanding anything to the contrary in Section 12(g), the notice period shall begin on the date Warrantholder actually receives a written notice containing all the information required to be provided in such subsection (f). 

SECTION 9. REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE COMPANY. 
 (a) Reservation of Preferred Stock. The Preferred Stock issuable upon exercise of the Warrantholder’s rights has been duly and validly reserved and, when issued in accordance with the
provisions of this Agreement, will be validly issued, fully paid and non-assessable, and will be free of any taxes, liens, charges or encumbrances of any nature whatsoever; provided, that the Preferred Stock issuable pursuant to this
Agreement may be subject to restrictions on transfer under state and/or federal securities laws. The Company has made available to the Warrantholder true, correct and complete copies of its Charter and current bylaws. The issuance of certificates
for shares of Preferred Stock upon exercise of this Agreement shall be made without charge to the Warrantholder for any issuance tax in respect thereof, or other cost incurred by the Company in connection with such exercise and the related issuance
of shares of Preferred Stock; provided, that the Company shall not be required to pay any tax which may be payable in respect of any transfer and the issuance and delivery of any certificate in a name other than that of the Warrantholder.

 (b) Due Authority. The execution and delivery by the Company of this Agreement and the performance of all obligations
of the Company hereunder, including the issuance to Warrantholder of the right to acquire the shares of Preferred Stock and the Common Stock into which it may be converted have been duly authorized by all necessary corporate action on the part of
the Company. This Agreement: (1) does not violate the Company’s Charter or current bylaws; (2) does not contravene any law or governmental rule, regulation or order applicable to it; and (3) does not and will not contravene any
provision of, or constitute a default under, any indenture, mortgage, contract or other instrument to which it is a party or by which it is bound. This Agreement constitutes a legal, valid and binding agreement of the Company, enforceable in
accordance with its terms. 
 (c) Consents and Approvals. No consent or approval of, giving of notice to, registration
with, or taking of any other action in respect of any state, federal or other governmental authority or agency is required with respect to the execution, delivery and performance by the Company of its obligations under this Agreement, except for the
filing of notices pursuant to Regulation D under the Act and any filing required by applicable state securities law, which filings will be effective by the time required thereby. 

(d) Issued Securities. All issued and outstanding shares of Common Stock, Preferred Stock or any other securities of the Company
have been duly authorized and validly issued and are fully paid and nonassessable. All outstanding shares of Common Stock, Preferred Stock and any other securities were issued in full compliance with all federal and state securities laws. In
addition, as of the date immediately preceding the Effective Date: 
 (i) The authorized capital of the Company
consists of (A) 308,000,000 shares of Common Stock, of which 8,679,620 shares are issued and outstanding, and (B) 213,912,542 shares of Preferred Stock, consisting of (i) 1,875,000 shares designated as Series A Preferred Stock, of
which 1,875,000 shares are issued and outstanding and are convertible into 2,298,753 shares of Common Stock at $0.261 per share, (ii) 9,672,442 shares designated as Series B Preferred Stock, of which 9,672,442 shares are issued and

  
 7

 
outstanding and are convertible into 18,358,296 shares of Common Stock at $0.349 per share, (iii) 12,065,100 shares designated as Series C Preferred Stock, of which 11,675,878 shares are
issued and outstanding and are convertible into 29,353,159 shares of Common Stock at $0.511 per share, (iv) 115,300,000 shares designated as Series D Preferred Stock, of which 111,071,231 shares are issued and outstanding and are convertible
into 111,071,231 shares of Common Stock at $0.235 per share, and (v) 75,000,000 shares designated as Series E Preferred Stock, of which 67,471,300 shares are issued and outstanding and are convertible into 67,471,300 shares of Common Stock at
$0.68 per share. 
 (ii) The Company has reserved 68,400,797 shares of Common Stock for issuance under its Stock
Option Plan(s), under which 56,194,592 options are outstanding. There are no other options, warrants, conversion privileges or other rights presently outstanding to purchase or otherwise acquire any authorized but unissued shares of the
Company’s capital stock or other securities of the Company, except (a) warrants to purchase 100,000 shares of Common Stock, (b) warrants to purchase 100,000 shares of Series C Preferred Stock which are convertible into 251,400 shares
of Common Stock at $0.511 per share, and (c) warrants to purchase 1,470,588 shares of Series E Preferred Stock which are convertible into 1,470,588 shares of Common Stock at $0.68 per share. The Company has no outstanding loans to any employee,
officer or director of the Company, and the Company agrees not to enter into any such loan or otherwise guarantee the payment of any loan made to an employee, officer or director by a third party. 

(iii) Except as set forth in the Company’s Amended and Restated Investors’ Rights Agreement, as amended from
time to time (the “Rights Agreement”), no stockholder of the Company has preemptive rights to purchase new issuances of the Company’s capital stock. 
 (e) Insurance. The Company has in full force and effect insurance policies, with extended coverage, insuring the Company and its property and business against such losses and risks, and in such
amounts, as are customary for corporations engaged in a similar business and similarly situated and as otherwise may be required pursuant to the terms of any other contract or agreement. 

(f) Other Commitments to Register Securities. Except as set forth in this Agreement and the Rights Agreement, the Company is not,
pursuant to the terms of any other agreement currently in existence, under any obligation to register under the Act any of its presently outstanding securities or any of its securities which may hereafter be issued. 

(g) Exempt Transaction. Subject to the accuracy of the Warrantholder’s representations in Section 10, the issuance of
the Preferred Stock upon exercise of this Agreement, and the issuance of the Common Stock upon conversion of the Preferred Stock will each constitute a transaction exempt from (i) the registration requirements of Section 5 of the Act, in
reliance upon Section 4(2) thereof, and (ii) the qualification requirements of the applicable state securities laws. 

(h) Compliance with Rule 144. If the Warrantholder proposes to sell Preferred Stock issuable upon the exercise of this Agreement,
or the Common Stock into which it is convertible, in compliance with Rule 144 promulgated by the SEC, then, upon Warrantholder’s written request to the Company, the Company shall furnish to the Warrantholder, within ten days after receipt of
such request, a written statement confirming the Company’s compliance with the filing requirements of the SEC as set forth in such Rule, as such Rule may be amended from time to time. 

  
 8

 (i) Information Rights. During the term of this Warrant, Warrantholder shall be
entitled to the information rights contained in Section 7.1 of the Loan Agreement, and Section 7.1 of the Loan Agreement is hereby incorporated into this Agreement by this reference as though fully set forth herein, provided, however, that
the Company shall not be required to deliver a Compliance Certificate once all Indebtedness (as defined in the Loan Agreement) owed by the Company to Warrantholder has been repaid. 
 SECTION 10. REPRESENTATIONS AND COVENANTS OF THE WARRANTHOLDER. 
 This
Agreement has been entered into by the Company in reliance upon the following representations and covenants of the Warrantholder: 
 (a) Investment Purpose. The right to acquire Preferred Stock or the Preferred Stock issuable upon exercise of the Warrantholder’s rights contained herein will be acquired for investment and
not with a view to the sale or distribution of any part thereof, and the Warrantholder has no present intention of selling or engaging in any public distribution of the same except pursuant to a registration or exemption. 

(b) Private Issue. The Warrantholder understands (i) that the Preferred Stock issuable upon exercise of this Agreement is not
registered under the Act or qualified under applicable state securities laws on the ground that the issuance contemplated by this Agreement will be exempt from the registration and qualifications requirements thereof, and (ii) that the
Company’s reliance on such exemption is predicated on the representations set forth in this Section 10. 
 (c)
Financial Risk. The Warrantholder has such knowledge and experience in financial and business matters as to be capable of evaluating the merits and risks of its investment, and has the ability to bear the economic risks of its investment.

 (d) Risk of No Registration. The Warrantholder understands that if the Company does not register with the SEC pursuant
to Section 12 of the Securities Exchange Act of 1934 (the “1934 Act”), or file reports pursuant to Section 15(d) of the 1934 Act, or if a registration statement covering the securities under the Act is not in effect when
it desires to sell (i) the rights to purchase Preferred Stock pursuant to this Agreement or (ii) the Preferred Stock issuable upon exercise of the right to purchase, it may be required to hold such securities for an indefinite period. The
Warrantholder also understands that any sale of (A) its rights hereunder to purchase Preferred Stock or (B) Preferred Stock issued or issuable hereunder which might be made by it in reliance upon Rule 144 under the Act may be made only in
accordance with the terms and conditions of that Rule. 
 (e) Accredited Investor. Warrantholder is an “accredited
investor” within the meaning of the Securities and Exchange Rule 501 of Regulation D, as presently in effect. 
 (f)
Lock-Up Period; Agreement. Warrantholder hereby agrees that it shall not, to the extent requested by the Company or an underwriter of securities of the Company, sell or otherwise transfer or dispose of any Registrable Securities (as defined
in the Rights Agreement) or other shares of stock of the Company then owned by such Warrantholder (other than to donees or partners of the Holder who agree to be similarly bound) for up to one hundred eighty (180) days following the effective
date of any registration statement of the Company filed under the Securities Act; provided, however, if during the last 17 days of the restricted period the Company issues an earnings release or material news or a material event
relating to the Company occurs, or prior to the expiration of the restricted period the Company announces that it will release earnings results during the 16-day period beginning on the last day of the restricted period, and if the Company’s
securities are listed on the Nasdaq Stock Market and Rule 2711 thereof applies, then the restrictions imposed by this Section 10(f) shall continue to apply until the expiration of the 

  
 9

 
18-day period beginning on the issuance of the earnings release or the occurrence of the material news or material event. In no event will the restricted period extend beyond two hundred and
fifteen (215) days after the effective date of the registration statement. 
 SECTION 11. TRANSFERS. 

Subject to compliance with applicable federal and state securities laws, this Agreement and all rights hereunder are transferable, in
whole or in part, without charge to the holder hereof (except for transfer taxes) upon surrender of this Agreement properly endorsed. Each taker and holder of this Agreement, by taking or holding the same, consents and agrees that this Agreement,
when endorsed in blank, shall be deemed negotiable, and that the holder hereof, when this Agreement shall have been so endorsed and its transfer recorded on the Company’s books, shall be treated by the Company and all other persons dealing with
this Agreement as the absolute owner hereof for any purpose and as the person entitled to exercise the rights represented by this Agreement. The transfer of this Agreement shall be recorded on the books of the Company upon receipt by the Company of
a notice of transfer in the form attached hereto as Exhibit III (the “Transfer Notice”), at its principal offices and the payment to the Company of all transfer taxes and other governmental charges imposed on such transfer. Until
the Company receives such Transfer Notice, the Company may treat the registered owner hereof as the owner for all purposes. 
 SECTION
12. MISCELLANEOUS. 
 (a) Effective Date. The provisions of this Agreement shall be construed and shall be given
effect in all respects as if it had been executed and delivered by the Company on the date hereof. This Agreement shall be binding upon any successors or assigns of the Company. 

(b) Remedies. In the event of any default hereunder, the non-defaulting party reserves its right to protect and enforce its rights
either by suit in equity and/or by action at law, including but not limited to an action for damages as a result of any such default; provided, that the parties hereto declare that it is impossible to measure in money the damages which will accrue
to Warrantholder by reason of the Company’s failure to perform any of the obligations under this Warrant and agree that the terms of this Warrant shall be specifically enforceable by Warrrantholder. If Warrantholder institutes any action or
proceeding to specifically enforce the provisions hereof, any person against whom such action or proceeding is brought hereby waives the claim or defense therein that Warrantholder has an adequate remedy at law, and such person shall not offer in
any such action or proceeding the claim or defense that such remedy at law exists. 
 (c) No Impairment of Rights. The
Company will not, by amendment of its Charter or through any other means, avoid or seek to avoid the observance or performance of any of the terms of this Agreement, but will at all times in good faith assist in the carrying out of all such terms
and in the taking of all such actions as may be necessary or appropriate in order to protect the rights of the Warrantholder against impairment. Notwithstanding the foregoing, nothing in this Section 12(c) shall prohibit the Company from
amending its Charter with the requisite consent of the stockholders and the Board of Directors so long as such amendment affects the rights granted to Warrantholder associated with the Preferred Stock in the same manner as the other holders of the
Preferred Stock. 
 (d) Additional Documents. The Company, upon execution of this Agreement, shall provide the
Warrantholder with certified resolutions with respect to the representations, warranties and covenants set forth in Sections 9(a) through 9(d), 9(f) and 9(g). The Company shall also supply such other documents as the Warrantholder may from time to
time reasonably request. 

  
 10

 (e) Attorney’s Fees. In any litigation, arbitration or court proceeding between
the Company and the Warrantholder relating hereto, the prevailing party shall be entitled to attorneys’ fees and expenses and all costs of proceedings incurred in enforcing this Agreement. For the purposes of this Section 12(e),
attorneys’ fees shall include without limitation fees incurred in connection with the following: (i) contempt proceedings; (ii) discovery; (iii) any motion, proceeding or other activity of any kind in connection with an
insolvency proceeding; (iv) garnishment, levy, and debtor and third party examinations; and (v) post-judgment motions and proceedings of any kind, including without limitation any activity taken to collect or enforce any judgment.

 (f) Severability. In the event any one or more of the provisions of this Agreement shall for any reason be held
invalid, illegal or unenforceable, the remaining provisions of this Agreement shall be unimpaired, and the invalid, illegal or unenforceable provision shall be replaced by a mutually acceptable valid, legal and enforceable provision, which comes
closest to the intention of the parties underlying the invalid, illegal or unenforceable provision. 
 (g) Notices.
Except as otherwise provided herein, any notice, demand, request, consent, approval, declaration, service of process or other communication that is required, contemplated, or permitted under this Agreement or with respect to the subject matter
hereof shall be in writing, and shall be deemed to have been validly served, given, delivered, and received upon the earlier of: (i) the day of transmission by facsimile or hand delivery if transmission or delivery occurs on a business day at
or before 5:00 pm in the time zone of the recipient, or, if transmission or delivery occurs on a non-business day or after such time, the first business day thereafter, or the first business day after deposit with an overnight express service or
overnight mail delivery service; or (ii) the third calendar day after deposit in the United States mails, with proper first class postage prepaid, and shall be addressed to the party to be notified as follows: 

If to Warrantholder: 
 HERCULES TECHNOLOGY GROWTH CAPITAL, INC. 
 Legal Department 

Attention: Chief Legal Officer and Manuel Henriquez 
 400 Hamilton Avenue, Suite 310 
 Palo Alto, CA 94301 

Facsimile: 

Telephone: 
 With a copy to: 
 BINGHAM MCCUTCHEN 

Attn: John Connolly 
 Three Embarcadero Center 
 San Francisco, CA 94111 

Facsimile: 

Telephone: 
  

	 	(i)	If to the Company: 

 ENPHASE
ENERGY, INC. 
 Attention: Senior Corporate Counsel 
 201 First Street, Suite 300 
 Petaluma, CA 94952 

  
 11

 Facsimile: 
 Telephone: 
 or to such other address as each party may designate for itself by like notice.

 (h) Entire Agreement; Amendments. This Agreement constitutes the entire agreement and understanding of the parties
hereto in respect of the subject matter hereof, and supersedes and replaces in their entirety any prior proposals, term sheets, letters, negotiations or other documents or agreements, whether written or oral, with respect to the subject matter
hereof (including Warrantholder’s proposal letter dated March 30, 2011). None of the terms of this Agreement may be amended except by an instrument executed by each of the parties hereto. 

(i) Headings. The various headings in this Agreement are inserted for convenience only and shall not affect the meaning or
interpretation of this Agreement or any provisions hereof. 
 (j) Advice of Counsel. Each of the parties represents to
each other party hereto that it has discussed (or had an opportunity to discuss) with its counsel this Agreement and, specifically, the provisions of Sections 12(n), 12(o), 12(p) and 12(q). 

(k) No Strict Construction. The parties hereto have participated jointly in the negotiation and drafting of this Agreement. In the
event an ambiguity or question of intent or interpretation arises, this Agreement shall be construed as if drafted jointly by the parties hereto and no presumption or burden of proof shall arise favoring or disfavoring any party by virtue of the
authorship of any provisions of this Agreement. 
 (l) No Waiver. No omission or delay by Warrantholder at any time to
enforce any right or remedy reserved to it, or to require performance of any of the terms, covenants or provisions hereof by the Company at any time designated, shall be a waiver of any such right or remedy to which Warrantholder is entitled, nor
shall it in any way affect the right of Warrantholder to enforce such provisions thereafter. 
 (m) Survival. All
agreements, representations and warranties contained in this Agreement or in any document delivered pursuant hereto shall be for the benefit of Warrantholder and shall survive the execution and delivery of this Agreement and the expiration or other
termination of this Agreement. 
 (n) Governing Law. This Agreement have been negotiated and delivered to Warrantholder
in the State of California, and shall have been accepted by Warrantholder in the State of California. Delivery of Preferred Stock to Warrantholder by the Company under this Agreement is due in the State of California. This Agreement shall be
governed by, and construed and enforced in accordance with, the laws of the State of California, excluding conflict of laws principles that would cause the application of laws of any other jurisdiction. 

(o) Consent to Jurisdiction and Venue. All judicial proceedings arising in or under or related to this Agreement may be brought in
any state or federal court of competent jurisdiction located in the State of California. By execution and delivery of this Agreement, each party hereto generally and unconditionally: (a) consents to personal jurisdiction in Santa Clara County,
State of California; (b) waives any objection as to jurisdiction or venue in Santa Clara County, State of California; (c) agrees not to assert any defense based on lack of jurisdiction or venue in the aforesaid courts; and
(d) irrevocably agrees to be bound by any judgment rendered thereby in connection with this Agreement. Service of process on any party hereto in any action arising out of or relating to this Agreement shall be effective if given in accordance
with the requirements for notice set forth in Section 12(g), and shall be deemed effective and received as set forth in 

  
 12

 
Section 12(g). Nothing herein shall affect the right to serve process in any other manner permitted by law or shall limit the right of either party to bring proceedings in the courts of any
other jurisdiction. 
 (p) Mutual Waiver of Jury Trial. Because disputes arising in connection with complex financial
transactions are most quickly and economically resolved by an experienced and expert person and the parties wish applicable state and federal laws to apply (rather than arbitration rules), the parties desire that their disputes be resolved by a
judge applying such applicable laws. EACH OF THE COMPANY AND WARRANTHOLDER SPECIFICALLY WAIVES ANY RIGHT IT MAY HAVE TO TRIAL BY JURY OF ANY CAUSE OF ACTION, CLAIM, CROSS-CLAIM, COUNTERCLAIM, THIRD PARTY CLAIM OR ANY OTHER CLAIM (COLLECTIVELY,
“CLAIMS”) ASSERTED BY THE COMPANY AGAINST WARRANTHOLDER OR ITS ASSIGNEE OR BY WARRANTHOLDER OR ITS ASSIGNEE AGAINST THE COMPANY. This waiver extends to all such Claims, including Claims that involve Persons other than the Company and
Warrantholder; Claims that arise out of or are in any way connected to the relationship between the Company and Warrantholder; and any Claims for damages, breach of contract, specific performance, or any equitable or legal relief of any kind,
arising out of this Agreement. 
 (q) Judicial Reference. If the Mutual Waiver of Jury Trial set forth in
Section 12(p) is ineffective or unenforceable, the parties agree that all Claims shall be resolved by reference to a private judge sitting without a jury, pursuant to Code of Civil Procedure Section 638, before a mutually acceptable
referee or, if the parties cannot agree, a referee selected by the Presiding Judge of Santa Clara County, California. Such proceeding shall be conducted in Santa Clara County, California, with California rules of evidence and discovery applicable to
such proceeding. In the event Claims are to be resolved by judicial reference, either party may seek from a court identified in Section 12(o), any prejudgment order, writ or other relief and have such prejudgment order, writ or other relief
enforced to the fullest extent permitted by law notwithstanding that all Claims are otherwise subject to resolution by judicial reference. 
 (r) Counterparts. This Agreement and any amendments, waivers, consents or supplements hereto may be executed in any number of counterparts, and by different parties hereto in separate counterparts,
each of which when so delivered shall be deemed an original, but all of which counterparts shall constitute but one and the same instrument. 
 [Remainder of Page Intentionally Left Blank] 

  
 13

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by its
officers thereunto duly authorized as of the Effective Date. 
  

									
	COMPANY:	 		 	ENPHASE ENERGY, INC.
					
		 		 		 	By:	 	/s/ Sanjeev Kumar
		 		 		 	Name:	 	 
		 		 		 	Title:	 	 

  

									
	WARRANTHOLDER:	 		 	HERCULES TECHNOLOGY GROWTH CAPITAL, INC.,
		 		 	a Maryland corporation
					
		 		 		 	By:	 	/s/ K. Nicholas Martitsch
		 		 		 	Name:	 	K. Nicholas Martitsch
		 		 		 	Its:	 	Associate General Counsel

 [Signature Page to Warrant Agreement] 

 EXHIBIT I 
 NOTICE OF EXERCISE 
  

	To:	ENPHASE ENERGY, INC. (the “Company”) 

  

	(1)	The undersigned Warrantholder hereby elects to purchase [            ] shares of the
[    ] Preferred Stock of the Company, pursuant to the terms of that certain Warrant Agreement, dated as of June 13, 2011, between the Company and the Warrantholder (the “Agreement”), and [CASH PAYMENT: tenders
herewith payment of the Purchase Price in full, together with all applicable transfer taxes, if any.] [NET ISSUANCE: elects pursuant to Section 3(a) of the Agreement to effect a Net Issuance.] 

 

	(2)	Please issue a certificate or certificates representing said shares of [    ] Preferred Stock in the name of the Warrantholder or in such other name
as is specified below. 

  

									
	WARRANTHOLDER:	 		 	HERCULES TECHNOLOGY GROWTH CAPITAL, INC.,
		 		 	a Maryland corporation
					
		 		 		 	By:	 	 
		 		 		 	Name:	 	K. Nicholas Martitsch
		 		 		 	Its:	 	Associate General Counsel

 EXHIBIT II 
 ACKNOWLEDGMENT OF EXERCISE 
 The undersigned, as representative of Enphase Energy, Inc. (the
“Company”), hereby acknowledges receipt of the “Notice of Exercise” from Hercules Technology Growth Capital, Inc. (the “Warrantholder”), to purchase
[            ] shares of the [    ] Preferred Stock of the Company, pursuant to the terms of that certain Warrant Agreement, dated as of June 13, 2011,
between the Company and the Warrantholder (the “Agreement”), and further acknowledges that [            ] shares remain subject to purchase under the terms of the
Agreement. 
  

									
	COMPANY:	 		 	ENPHASE ENERGY, INC.
					
		 		 		 	By:	 	 
					
		 		 		 	Title:	 	 
					
		 		 		 	Date:	 	 

 EXHIBIT III 
 TRANSFER NOTICE 
 FOR VALUE RECEIVED, that certain Warrant Agreement, dated as of June 13,
2011, between Enphase Energy, Inc. and Hercules Technology Growth Capital, Inc., as the Warrantholder (the “Agreement”), and all rights evidenced thereby are hereby transferred and assigned to 

 

	
	  
	(Please Print)

			
		
	whose address is	 	 
	
	 

  

							
		
		 	
			
		 	Dated:	 	 
			
		 	Holder’s Signature:	 	 
			
		 	Holder’s Address:	 	 
		
		 	 
		
	Signature Guaranteed:	 	 

 NOTE: The signature to this Transfer Notice must correspond with the name as it appears on the face of the Agreement,
without alteration or enlargement or any change whatever. Officers of corporations and those acting in a fiduciary or other representative capacity should file proper evidence of authority to assign the foregoing Agreement.

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