Document:

Form of Series A Warrant

 Exhibit 4.1 
 COMMON STOCK PURCHASE WARRANT 
 STEMCELLS, INC. 

 

			
	Warrant Shares:                 	 	Issue Date: December     , 2011

 THIS COMMON STOCK PURCHASE WARRANT (the “Warrant”) certifies that, for value received,
                     (the “Holder”) is entitled, upon the terms and subject to the limitations on exercise and the conditions
hereinafter set forth, at any time on or after the Issue Date and on or prior to the close of business on the fifth anniversary of the Issue Date (the “Termination Date”) but not thereafter, to subscribe for and purchase from
StemCells, Inc., a Delaware corporation (the “Company”), up to                 1 shares (the “Warrant Shares”) of common stock of the Company (“Common Stock”).

 Section 1. Definitions. Capitalized terms used herein shall have the meanings given to them herein. As
used herein, “Original Issue Date” means December     , 2011 and “business day” means any day on which the New York Stock Exchange, Inc. is open for trading. 

Section 2. Exercise. 
 a) Exercise of Warrant. Exercise of the purchase rights represented by this Warrant may be made, in whole or in part, at any time or times on or after the Issue Date and on or before the
Termination Date by delivery to the Company (or such other office or agency of the Company as it may designate by notice in writing to the registered Holder at the address of the Holder appearing on the books of the Company) of a duly executed
facsimile copy of the Notice of Exercise Form annexed hereto; and, within three (3) business days of the date said Notice of Exercise is delivered to the Company, the Company shall have received payment of the aggregate Exercise Price of the
shares thereby purchased by wire transfer or cashier’s check drawn on a United States bank or, if available, pursuant to the cashless exercise procedure specified in Section 2(c) below. Notwithstanding anything herein to the contrary, the
Holder shall not be required to physically surrender this Warrant to the Company until the Holder has purchased all of the Warrant Shares available hereunder and the Warrant has been exercised in full, in which case, the Holder shall surrender this
Warrant to the Company for cancellation within three (3) business days of the date the final Notice of Exercise is delivered to the Company. Partial exercises of this Warrant resulting in purchases of a portion of the total number of Warrant
Shares available hereunder shall have the effect of lowering the outstanding number of Warrant Shares purchasable hereunder in an amount equal to the applicable number of Warrant Shares purchased or, in the case of a cashless exercise in accordance
with Section 2(c), the number of Warrant Shares that would have been issuable upon exercise of this Warrant in accordance with the terms of this Warrant if 

 

	1 	100% warrant coverage. 

  
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such exercise were by means of a cash exercise rather than a cashless exercise. The Holder and the Company shall maintain records showing the number of Warrant Shares purchased and the date of
such purchases. The Holder and any assignee, by acceptance of this Warrant, acknowledge and agree that, by reason of the provisions of this paragraph, following the purchase of a portion of the Warrant Shares hereunder, the number of Warrant
Shares available for purchase hereunder at any given time may be less than the amount stated on the face hereof. 
 b) Exercise Price. The exercise price per share of the Common Stock under this Warrant shall be $        , subject to adjustment hereunder (the
“Exercise Price”). 
 c) Cashless Exercise. If at the time of exercise hereof there is no
effective registration statement registering, or the prospectus contained therein is not available for the issuance of the Warrant Shares to the Holder, then this Warrant may also be exercised (and the Company shall be permitted to satisfy its
obligation to issue the Warrant Shares to be issued on exercise of this Warrant by issuing to the Holder), in whole or in part, at such time by means of a “cashless exercise” in which the Holder shall be entitled to receive a certificate
for the number of Warrant Shares equal to the quotient obtained by dividing [(A-B) (X)] by (A), where: 
  

					
		 	(A) =	 	the VWAP on the business day immediately preceding the date on which Holder elects to exercise this Warrant by means of a “cashless exercise,” as set forth in the
applicable Notice of Exercise;
			
		 	(B) =	 	the Exercise Price of this Warrant, as adjusted hereunder; and
			
		 	(X) =	 	the number of Warrant Shares that would be issuable upon exercise of this Warrant in accordance with the terms of this Warrant if such exercise were by means of a cash exercise
rather than a cashless exercise.

 “VWAP” means, for any date, the price determined by the first of the
following clauses that applies: (a) if the Common Stock is then listed or quoted on a market or exchange, the daily volume weighted average price of the Common Stock for such date (or the nearest preceding date) on such market or exchange on
which the Common Stock is then listed or quoted as reported by Bloomberg L.P. (based on a business day from 9:30 a.m. (New York City time) to 4:02 p.m. (New York City time)), (b) if the OTC Bulletin Board is not a market or exchange, the volume
weighted average price of the Common Stock for such date (or the nearest preceding date) on the OTC Bulletin Board, (c) if the Common Stock is not then listed or quoted for trading on the OTC Bulletin Board and if prices for the Common Stock
are then reported in the “Pink Sheets” published by Pink OTC Markets, Inc. (or a similar organization or agency succeeding to its functions of reporting prices), the most recent bid price per share of the Common Stock so reported, or
(d) in all other cases, the fair market value of a share of Common Stock as determined by an independent appraiser selected in good faith by the Company and reasonably acceptable to the Required Holders (as defined herein), the fees and
expenses of which shall be paid by the Company. 

  
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 d) Mechanics of Exercise. 

i. Delivery of Certificates Upon Exercise. Certificates for shares purchased hereunder shall be transmitted by the
transfer agent to the Holder by crediting the account of the Holder’s prime broker with The Depository Trust Company through its Deposit or Withdrawal at Custodian system (“DWAC”) if the Company is then a participant in such
system and either (A) there is an effective Registration Statement covering the issuance of the Warrant Shares to the Holder or (B) this Warrant is being exercised via cashless exercise, and otherwise by physical delivery to the address
specified by the Holder in the Notice of Exercise by the date that is three (3) business days after the latest of (A) the delivery to the Company of the Notice of Exercise Form, (B) surrender of this Warrant (if required) and
(C) payment of the aggregate Exercise Price as set forth above (including by cashless exercise, if permitted) (such date, the “Warrant Share Delivery Date”). This Warrant shall be deemed to have been exercised on the first date
on which all of the foregoing have been delivered to the Company. The Warrant Shares shall be deemed to have been issued, and Holder or any other person so designated to be named therein shall be deemed to have become a holder of record of such
shares for all purposes, as of the date the Warrant has been properly exercised, with payment to the Company of the Exercise Price (or by cashless exercise, if permitted) and all taxes required to be paid by the Holder, if any, pursuant to
Section 2(d)(vi) prior to the issuance of such shares, having been paid. 
 ii. Delivery of New Warrants
Upon Exercise. If this Warrant shall have been exercised in part, the Company shall, at the request of the Holder and upon surrender of this Warrant certificate, at the time of delivery of the certificate or certificates representing Warrant
Shares, deliver to the Holder a new Warrant evidencing the rights of the Holder to purchase the unpurchased Warrant Shares called for by this Warrant, which new Warrant shall in all other respects be identical with this Warrant. 

iii. Rescission Rights. If the Company fails to cause the transfer agent to transmit to the Holder a certificate
or the certificates representing the Warrant Shares pursuant to Section 2(d)(i) by the Warrant Share Delivery Date, then, the Holder will have the right to rescind such exercise. 

iv. Compensation for Buy-In on Failure to Timely Deliver Certificates Upon Exercise. In addition to any other
rights available to the Holder, if by the close of the fifth business day after delivery of a notice of exercise the Company fails to cause the transfer agent to transmit to the Holder a certificate or the certificates representing the Warrant
Shares 

  
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pursuant to an exercise on or before the Warrant Share Delivery Date, and if after such Warrant Share Delivery Date, the Holder purchases (in an open market transaction or otherwise) shares of
Common Stock to deliver in satisfaction of a sale by the Holder of the Warrant Shares that the Holder anticipated receiving from the Company (a “Buy-In”), then the Company shall, within five (5) business days after the
Holder’s request and in the Holder’s discretion, either (i) pay cash to the Holder in an amount, equal to the Holder’s total purchase price (including reasonable brokerage commissions, if any) for the shares of Common Stock so
purchased (the “Buy-In Price”), at which point the Company’s obligation to deliver such certificate (and to issue such Common Stock) shall terminate, or (ii) promptly honor its obligation to deliver to the Holder a
certificate or certificates representing such Warrant Shares and pay cash to the Holder in an amount equal to the excess (if any) of the Buy-In Price over the product of (A) such number of Warrant Shares, times (B) the VWAP (as reported by
Bloomberg, L.P.) on the date of the event giving rise to the Company’s obligation to deliver such certificate. 

Notwithstanding the foregoing, the Company shall not be required to make the payments set forth herein in the case of uncertificated
Warrant Shares if the Holder fails to timely file a request with the depository trust company to receive such uncertificated Warrant Shares. 
 Notwithstanding the foregoing, if the Company fails to cause the transfer agent to transmit to the Holder a certificate or the certificates representing the Warrant Shares pursuant to an exercise on or
before the Warrant Share Delivery Date, then the Holder will have the right to rescind such Notice of Exercise. Nothing herein shall limit a Holder’s right to pursue any other remedies available to it hereunder, at law or in equity including,
without limitation, a decree of specific performance and/or injunctive relief with respect to the Company’s failure to timely deliver a certificate pursuant to the terms hereof. 

v. No Fractional Shares or Scrip. No fractional shares or scrip representing fractional shares shall be issued
upon the exercise of this Warrant. As to any fraction of a share which the Holder would otherwise be entitled to purchase upon such exercise, the Company shall, at its election, either pay a cash adjustment in respect of such final fraction in an
amount equal to such fraction multiplied by the Exercise Price or round up to the next whole share. 
 vi.
Charges, Taxes and Expenses. Issuance of certificates for Warrant Shares shall be made without charge to the Holder for any issue or transfer tax or other incidental expense in respect of the issuance of such certificate, all of which taxes
and expenses shall be paid by the Company, and such certificates shall be issued in the name of the Holder 

  
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or in such name or names as may be directed by the Holder; provided, however, that in the event certificates for Warrant Shares are to be issued in a name other than the name of the
Holder, this Warrant when surrendered for exercise shall be accompanied by the Assignment Form attached hereto duly executed by the Holder and the Company may require, as a condition thereto, the payment of a sum sufficient to reimburse it for any
transfer tax incidental thereto. 
 vii. Closing of Books. The Company will not close its stockholder
books or records in any manner which prevents the timely exercise of this Warrant, pursuant to the terms hereof. 

e) Holder’s Exercise Limitations. The Company shall not effect any exercise of this Warrant, and a Holder
shall not have the right to exercise any portion of this Warrant, pursuant to Section 2 or otherwise, to the extent that after giving effect to such issuance after exercise as set forth on the applicable Notice of Exercise, the Holder (together
with the Holder’s affiliates, and any other Persons acting as a group together with the Holder or any of the Holder’s affiliates), would beneficially own in excess of the Beneficial Ownership Limitation (as defined below). For
purposes of the foregoing sentence, the number of shares of Common Stock beneficially owned by the Holder and its affiliates shall include the number of shares of Common Stock issuable upon exercise of this Warrant with respect to which such
determination is being made, but shall exclude the number of shares of Common Stock which would be issuable upon (i) exercise of the remaining, nonexercised portion of this Warrant beneficially owned by the Holder or any of its affiliates and
(ii) exercise or conversion of the unexercised or nonconverted portion of any other securities of the Company including, without limitation, any other securities of the Company or any Company subsidiary consolidated in the Company’s
financial statements which would entitle the holder thereof to acquire at any time Common Stock (“Common Stock Equivalents”) subject to a limitation on conversion or exercise analogous to the limitation contained herein beneficially
owned by the Holder or any of its affiliates. Except as set forth in the preceding sentence, for purposes of this Section 2(e), beneficial ownership shall be calculated in accordance with Section 13(d) of the Exchange Act and the
rules and regulations promulgated thereunder, it being acknowledged by the Holder that the Company is not representing to the Holder that such calculation is in compliance with Section 13(d) of the Exchange Act and the Holder is solely
responsible for any schedules required to be filed in accordance therewith. To the extent that the limitation contained in this Section 2(e) applies, the determination of whether this Warrant is exercisable (in relation to other securities
owned by the Holder together with any affiliates) and of which portion of this Warrant is exercisable shall be in the sole discretion of the Holder, and the submission of a Notice of Exercise shall be deemed to be the Holder’s determination of
whether this Warrant is exercisable (in relation to other securities owned by the Holder together with any affiliates) and of which portion of this Warrant is exercisable, in each case subject to the Beneficial Ownership Limitation, and the Company
shall have no obligation to verify or confirm the accuracy of such determination and shall have no liability for exercises of the Warrant that are in non-compliance with the Beneficial Ownership Limitation. In addition, a determination

  
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as to any group status as contemplated above shall be determined in accordance with Section 13(d) of the Exchange Act and the rules and regulations promulgated thereunder. For purposes of
this Section 2(e), in determining the number of outstanding shares of Common Stock, a Holder may rely on the number of outstanding shares of Common Stock as reflected in (A) the Company’s most recent periodic or annual report filed
with the Securities and Exchange Commission (the “Commission”), as the case may be, (B) a more recent public announcement by the Company or (C) a more recent written notice by the Company or the transfer agent setting
forth the number of shares of Common Stock outstanding. Upon the written or oral request of a Holder, the Company shall within two (2) business days confirm orally and in writing to the Holder the number of shares of Common Stock then
outstanding as established by (A), (B) or (C) above, as applicable. In any case, the number of outstanding shares of Common Stock shall be determined after giving effect to the conversion or exercise of securities of the Company,
including this Warrant, by the Holder or its affiliates since the date as of which such number of outstanding shares of Common Stock was reported. The “Beneficial Ownership Limitation” shall be 4.99% of the number of shares of the
Common Stock outstanding immediately after giving effect to the issuance of shares of Common Stock issuable upon exercise of this Warrant. The Holder, upon not less than 61 days’ prior notice to the Company, may increase or decrease the
Beneficial Ownership Limitation provisions of this Section 2(e), provided that the Beneficial Ownership Limitation in no event exceeds 9.99% of the number of shares of the Common Stock outstanding immediately after giving effect to the issuance
of shares of Common Stock upon exercise of this Warrant held by the Holder and the provisions of this Section 2(e) shall continue to apply. Any such increase or decrease will not be effective until the 61st day after such notice is delivered to the Company and shall only be
effective with respect to such Holder. The provisions of this paragraph shall be construed and implemented in a manner otherwise than in strict conformity with the terms of this Section 2(e) to correct this paragraph (or any portion hereof)
which may be defective or inconsistent with the intended Beneficial Ownership Limitation herein contained or to make changes or supplements necessary or desirable to properly give effect to such limitation. The limitations contained in this
paragraph shall apply to a successor holder of this Warrant. 
 Section 3. Certain Adjustments. 

a) Stock Dividends and Splits. If the Company, at any time while this Warrant is outstanding: (i) pays a stock
dividend or otherwise makes a distribution or distributions on shares of its Common Stock or any other equity or equity equivalent securities payable in shares of Common Stock (which, for avoidance of doubt, shall not include any shares of Common
Stock issued by the Company upon exercise of this Warrant), (ii) subdivides outstanding shares of Common Stock into a larger number of shares, (iii) combines (including by way of reverse stock split) outstanding shares of Common Stock into
a smaller number of shares, or (iv) issues by reclassification of shares of the Common Stock any shares of capital stock of the Company, then in each case the Exercise Price shall be multiplied by a fraction of which the numerator shall be the
number of shares of Common Stock (excluding treasury shares, if any) outstanding immediately before such event and of which the denominator shall be the number of 

  
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shares of Common Stock outstanding immediately after such event, and the number of shares issuable upon exercise of this Warrant shall be proportionately adjusted such that the aggregate Exercise
Price of this Warrant shall remain unchanged. Any adjustment made pursuant to this Section 3(a) shall become effective immediately after the record date for the determination of stockholders entitled to receive such dividend or distribution and
shall become effective immediately after the effective date in the case of a subdivision, combination or re-classification. 
 b) Adjustment upon Issuance of Shares of Common Stock. If and whenever on or after the date hereof, the Company issues or sells, or in accordance with this Section 3(b) is deemed to have
issued or sold, any shares of Common Stock including the issuance or sale of shares of Common Stock owned or held by or for the account of the Company, but excluding shares of Common Stock deemed to have been issued by the Company in connection with
any Exempt Issuance (defined below) or pursuant to Section 3(a) or Section 3(c), for a consideration per share (the “New Issuance Price”) less than a price (the “Applicable Price”) equal to the Exercise
Price in effect immediately prior to such issue or sale or deemed issuance or sale (the foregoing a “Dilutive Issuance”), then immediately after such Dilutive Issuance, the Exercise Price then in effect shall be reduced and only
reduced to an amount equal to the New Issuance Price. For purposes of determining the adjusted Exercise Price under this Section 3(b), the following shall be applicable: 

(i) Issuance of Options. If the Company in any manner grants any Options (as defined below), other than
in connection with any Exempt Issuance, and the lowest price per share for which one share of Common Stock is issuable upon the exercise of any such Option or upon conversion, exercise or exchange of any Convertible Securities (as defined below)
issuable upon exercise of any such Option is less than the Applicable Price, then such share of Common Stock shall be deemed to be outstanding and to have been issued and sold by the Company at the time of the granting or sale of such Option for
such price per share. For purposes of this Section 3(b)(i), the “lowest price per share for which one share of Common Stock is issuable upon exercise of such Options or upon conversion, exercise or exchange of such Convertible
Securities issuable upon exercise of any such Option” shall be equal to the sum of the lowest amounts of consideration (if any) paid or payable by the Company with respect to any one share of Common Stock upon the granting or sale of the
Option, upon exercise of the Option and upon conversion, exercise or exchange of any Convertible Security issuable upon exercise of such Option, in each case inclusive of any underwriter or placement or sales agent discount, commission or
concession. No further adjustment of the Exercise Price shall be made upon the actual issuance of such shares of Common Stock or of such Convertible Securities upon the exercise of such Options or upon the actual issuance of such shares of
Common Stock upon conversion, exercise or exchange of such Convertible Securities. “Options” means any rights, warrants or options to subscribe for or purchase shares of Common Stock or Common Stock Equivalents. “Convertible
Securities” means any stock or securities (other than Options) convertible into or exercisable or exchangeable for shares of Common Stock or Common Stock Equivalents. 

  
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 (ii) Issuance of Convertible Securities. If the Company in
any manner issues or sells any Convertible Securities, other than in connection with any Exempt Issuance, and the lowest price per share for which one share of Common Stock is issuable upon the conversion, exercise or exchange thereof is less than
the Applicable Price, then such share of Common Stock shall be deemed to be outstanding and to have been issued and sold by the Company at the time of the issuance or sale of such Convertible Securities for such price per share. For the
purposes of this Section 3(b)(ii), the “lowest price per share for which one share of Common Stock is issuable upon the conversion, exercise or exchange thereof” shall be equal to the sum of the lowest amounts of consideration (if
any) paid or payable by the Company with respect to one share of Common Stock upon the issuance or sale of the Convertible Security and upon conversion, exercise or exchange of such Convertible Security, in each case inclusive of any underwriter or
placement or sales agent discount, commission or concession. No further adjustment of the Exercise Price shall be made upon the actual issuance of such shares of Common Stock upon conversion, exercise or exchange of such Convertible Securities,
and if any such issue or sale of such Convertible Securities is made upon exercise of any Options for which adjustment of this Warrant has been or is to be made pursuant to other provisions of this Section 3(b), no further adjustment of the
Exercise Price shares shall be made by reason of such issue or sale. 
 (iii) Change in Option Price or
Rate of Conversion. If the purchase price provided for in any Options, the additional consideration, if any, payable upon the issue, conversion, exercise or exchange of any Convertible Securities, or the rate at which any Convertible
Securities are convertible into or exercisable or exchangeable for shares of Common Stock increases or decreases at any time, then the Exercise Price in effect at the time of such increase or decrease shall be adjusted to the Exercise Price which
would have been in effect at such time had such Options or Convertible Securities provided for such increased or decreased purchase price, additional consideration or increased or decreased conversion rate, as the case may be, at the time initially
granted, issued or sold. For purposes of this Section 3(b)(iii), if the terms of any Option or Convertible Security that was outstanding as of the date of issuance of this Warrant are increased or decreased in the manner described in the
immediately preceding sentence, then such Option or Convertible Security and the shares of Common Stock deemed issuable upon exercise, conversion or exchange thereof shall be deemed to have been issued as of the date of such increase or
decrease. No adjustment pursuant to this Section 3(b) shall be made if such adjustment would result in an increase of the Exercise Price then in effect. 

(iv) Calculation of Consideration Received. If any shares of Common Stock, Options or Convertible
Securities are issued or sold or deemed to have 

  
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been issued or sold for cash, the consideration paid therefor will be deemed to be the gross amount payable therefor, in each case inclusive of any underwriter or placement or sales agent
discount, commission or concession. If any shares of Common Stock, Options or Convertible Securities are issued or sold for a consideration other than cash, the amount of such consideration paid will be the fair value of such consideration,
except where such consideration consists of securities, in which case the amount of consideration paid to the Company will be the VWAP of such security on the date of receipt. If any shares of Common Stock, Options or Convertible Securities are
issued to the owners of the non-surviving entity in connection with any merger in which the Company is the surviving entity, the amount of consideration therefor will be deemed to be the fair value of such portion of the net assets and business of
the non-surviving entity as is attributable to such shares of Common Stock, Options or Convertible Securities, as the case may be. The fair value of any consideration other than cash or securities will be determined jointly by the Company and
the Holder. If such parties are unable to reach agreement within ten (10) days after the occurrence of an event requiring valuation (the “Valuation Event”), the fair value of such consideration will be determined within
five (5) business days after the tenth
(10th) day following the Valuation Event by an
independent, reputable appraiser jointly selected by the Company and the Holder. The determination of such appraiser shall be final and binding upon all parties absent manifest error and the fees and expenses of such appraiser shall be borne by
the Company. 
 (v) Record Date. If the Company takes a record of the holders of shares of
Common Stock for the purpose of entitling them (A) to receive a dividend or other distribution payable in shares of Common Stock, Options or in Convertible Securities or (B) to subscribe for or purchase shares of Common Stock, Options or
Convertible Securities, then such record date will be deemed to be the date of the issue or sale of the shares of Common Stock deemed to have been issued or sold upon the declaration of such dividend or the making of such other distribution or the
date of the granting of such right of subscription or purchase, as the case may be. 
 (vi) Exempt
Issuance. For the purposes of this Warrant, “Exempt Issuance” means the issuance of (a) shares of Common Stock, options or other equity-based awards to employees, officers, consultants or directors of the Company pursuant to any
stock or option plan duly adopted for such purpose, by a majority of the non-employee members of the Board of Directors or a majority of the members of a committee of non-employee directors established for such purpose, (b) securities upon the
exercise or exchange of or exchangeable for or convertible into shares of Common Stock issued and outstanding on the date hereof, provided that such securities have not been amended since date hereof to increase the number of such securities or to
decrease the exercise price, exchange price or conversion price of such securities, (c) securities issued pursuant to acquisitions or strategic transactions approved by a majority of the disinterested directors of the Company, provided that any
such issuance shall only be a Person 

  
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(or to the equityholders of a Person) which is, itself or through its subsidiaries, an operating company or an owner of an asset in a business synergistic with the business of the Company and
shall provide to the Company additional benefits in addition to the investment of funds, but shall not, for the purposes of this clause (c), include a transaction in which the Company is issuing securities primarily for the purpose of raising
capital or to an entity whose primary business is investing in securities, and (d) securities upon the exercise of the Company’s Series B Warrants issued on the Original Issue Date (including shares of Common Stock issuable upon the
exercise of the additional Warrants issuable upon the exercise of such Series B Warrants). 
 c) Subsequent
Rights Offerings. In addition to any adjustments pursuant to Section 3(a) above, if at any time the Company grants, issues or sells any Common Stock Equivalents or rights to purchase stock, warrants, securities or other property pro rata to
the record holders of any class of shares of Common Stock (the “Purchase Rights”), then the Holder will be entitled to acquire, upon the terms applicable to such Purchase Rights, the aggregate Purchase Rights which the Holder could
have acquired if the Holder had held the number of shares of Common Stock acquirable upon complete exercise of this Warrant (without regard to any limitations on exercise hereof, including without limitation, the Beneficial Ownership Limitation)
immediately before the date on which a record is taken for the grant, issuance or sale of such Purchase Rights, or, if no such record is taken, the date as of which the record holders of shares of Common Stock are to be determined for the grant,
issue or sale of such Purchase Rights (provided, however, to the extent that the Holder’s right to participate in any such Purchase Right would result in the Holder exceeding the Beneficial Ownership Limitation, then the Holder shall not be
entitled to participate in such Purchase Right to such extent (or beneficial ownership of such shares of Common Stock as a result of such Purchase Right to such extent) and such Purchase Right to such extent shall be held in abeyance for the Holder
until such time, if ever, as its right thereto would not result in the Holder exceeding the Beneficial Ownership Limitation). 

d) [Reserved] 
 e) Fundamental Transaction. If, at any time while this Warrant is outstanding, (i) the Company, directly or indirectly, in one or more related transactions effects any merger or consolidation
of the Company with or into another Person, (ii) the Company, directly or indirectly, effects any sale, lease, license, assignment, transfer, conveyance or other disposition of all or substantially all of its assets in one or a series of
related transactions, (iii) any, direct or indirect, purchase offer, tender offer or exchange offer (whether by the Company or another Person) is completed pursuant to which holders of Common Stock are permitted to sell, tender or exchange
their shares for other securities, cash or property and has been accepted by the holders of 50% or more of the outstanding Common Stock, (iv) the Company, directly or indirectly, in one or more related transactions effects any reclassification,
reorganization or recapitalization of the Common Stock or any compulsory share exchange pursuant to which the Common Stock is effectively converted into or exchanged for other securities, cash or property (other

  
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than as provided for under Section 3(a)), or (v) the Company, directly or indirectly, in one or more related transactions consummates a stock or share purchase agreement or other
business combination (including, without limitation, a reorganization, recapitalization, spin-off or scheme of arrangement) with another Person whereby such other Person acquires more than 50% of the outstanding shares of Common Stock (not including
any shares of Common Stock held by the other Person or other Persons making or party to, or associated or affiliated with the other Persons making or party to, such stock or share purchase agreement or other business combination) (each a
“Fundamental Transaction”), then, upon any subsequent exercise of this Warrant, the Holder shall have the right to receive, for each Warrant Share that would have been issuable upon such exercise immediately prior to the occurrence
of such Fundamental Transaction, at the option of the Holder (without regard to any limitation in Section 2(e) on the exercise of this Warrant), the number of shares of Common Stock of the successor or acquiring corporation or of the Company,
if it is the surviving corporation, and any additional consideration (the “Alternate Consideration”) receivable as a result of such Fundamental Transaction by a holder of the number of shares of Common Stock for which this Warrant
is exercisable immediately prior to such Fundamental Transaction (without regard to any limitation in Section 2(e) on the exercise of this Warrant). For purposes of clarity, no bona fide underwritten offering of the Company’s securities
will be deemed to be a Fundamental Transaction. For purposes of any such exercise, the determination of the Exercise Price shall be appropriately adjusted to apply to such Alternate Consideration based on the amount of Alternate Consideration
issuable in respect of one share of Common Stock in such Fundamental Transaction, and the Company shall apportion the Exercise Price among the Alternate Consideration in a reasonable manner reflecting the relative value of any different components
of the Alternate Consideration. If holders of Common Stock are given any choice as to the securities, cash or property to be received in a Fundamental Transaction, then the Holder shall be given the same choice as to the Alternate Consideration it
receives upon any exercise of this Warrant following such Fundamental Transaction. 

  
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 Notwithstanding the foregoing, in the event of a Fundamental Transaction
that is (1) an all cash transaction, (2) a “Rule 13e-3 transaction” as defined in Rule 13e-3 under the Exchange Act or (3) a Fundamental Transaction involving a person or entity not traded on either The New York Stock
Exchange, Inc., The NYSE Amex, LLC, The NASDAQ Global Select Market, The NASDAQ Global Market or The NASDAQ Capital Market, other than a merger in connection with a bona fide acquisition by the Company of any Person in which (x) the gross
consideration paid, directly or indirectly, by the Company in such acquisition is not greater than 45% of the Company’s market capitalization as calculated on each of (1) the date of the public announcement of such merger and (2) the
date of the consummation of such merger and (y) such merger does not contemplate any change to the identity of the board of directors of the Company or any of the members of the senior management of the Company, including, without limitation,
the chief executive officer and the chief financial officer of the Company, at the request of the Holder delivered before the 45th day after such Fundamental Transaction, the Company (or the Successor Entity, as defined below) shall purchase this
Warrant from the Holder by paying to the Holder, within five business days after such request (or, if later, on the effective date of the Fundamental Transaction), cash in an amount equal to the Black Scholes Value of the remaining unexercised
portion of this Warrant on the date of such Fundamental Transaction. “Black Scholes Value” means the value of this Warrant based on the Black Scholes Option Pricing Model obtained from the “OV” function on Bloomberg using
(i) a price per share of Common Stock equal to the Weighted Average Price of the Common Stock for the business day immediately preceding the date of consummation of the applicable Fundamental Transaction, (ii) a risk-free interest
rate corresponding to the U.S. Treasury rate for a period equal to the remaining term of this Warrant as of the date of the Holder’s request under this Section 3(e) and (iii) an expected volatility equal to the lesser of 80% and the
60-day volatility obtained from the HVT function on Bloomberg determined as of the business day next following the public announcement of the applicable Fundamental Transaction. 

The Company shall cause any successor entity in a Fundamental Transaction in which the Company is not the survivor (the
“Successor Entity”) to assume in writing all of the obligations of the Company under this Warrant in accordance with the provisions of this Section 3(e) pursuant to written agreements in form and substance reasonably
satisfactory to the Holder and approved by the Holder (without unreasonable delay) prior to such Fundamental Transaction and shall, at the option of the Holder, deliver to the Holder in exchange for this Warrant a security of the Successor Entity
evidenced by a written instrument substantially similar in form and substance to this Warrant which is exercisable for a corresponding number of shares of capital stock of such Successor Entity (or its parent entity) equivalent to the shares of
Common Stock acquirable and receivable upon exercise of this Warrant (without regard to any limitations on the exercise of this Warrant) prior to such Fundamental Transaction, and with an exercise price which applies the exercise price hereunder to
such shares of capital stock (but taking into account the relative value of the shares of Common Stock pursuant to such Fundamental Transaction and the value of such shares of capital stock, such number of shares of capital stock and such exercise
price being for the purpose of protecting the economic value of this Warrant immediately prior to the consummation of such 

  
 A-12

 
Fundamental Transaction), and which is reasonably satisfactory in form and substance to the Holder. Upon the occurrence of any such Fundamental Transaction, the Successor Entity shall succeed to,
and be substituted for (so that from and after the date of such Fundamental Transaction, the provisions of this Warrant referring to the “Company” shall refer instead to the Successor Entity), and may exercise every right and power of the
Company and shall assume all of the obligations of the Company under this Warrant with the same effect as if such Successor Entity had been named as the Company herein. 

f) Calculations. All calculations under this Section 3 shall be made to the nearest cent or the nearest
1/100th of a share, as the case may be. For purposes of this Section 3, the number of shares of Common Stock deemed to be issued and outstanding as of a given date shall be the sum of the number of shares of Common Stock (excluding treasury
shares, if any) issued and outstanding. 
 g) Notice to Holder. 

i. Adjustment to Exercise Price. Whenever the Exercise Price is adjusted pursuant to any provision of this
Section 3, the Company shall promptly mail to the Holder a notice setting forth the Exercise Price after such adjustment and setting forth a brief statement of the facts requiring such adjustment. 

ii. Notice to Allow Exercise by Holder. If during the term in which this Warrant may be exercised by the Holder
(A) the Company shall declare a dividend (or any other distribution in whatever form) on the Common Stock, (B) the Company shall declare a special nonrecurring cash dividend on or a redemption of the Common Stock, (C) the Company
shall authorize the granting to all holders of the Common Stock rights or warrants to subscribe for or purchase any shares of capital stock of any class or of any rights, (D) the approval of any stockholders of the Company shall be required in
connection with any reclassification of the Common Stock, any consolidation or merger to which the Company is a party, any sale or transfer of all or substantially all of the assets of the Company, or any compulsory share exchange whereby the Common
Stock is converted into other securities, cash or property, or (E) the Company shall authorize the voluntary or involuntary dissolution, liquidation or winding up of the affairs of the Company, then, in each case, the Company shall cause to be
mailed to the Holder at its last address as it shall appear upon the Warrant Register of the Company, at least 10 calendar days prior to the applicable record or effective date hereinafter specified, a notice stating (x) the date on which a
record is to be taken for the purpose of such dividend, distribution, redemption, rights or warrants, or if a record is not to be taken, the date as of which the holders of the Common Stock of record to be entitled to such dividend, distributions,
redemption, rights or warrants are to be determined or (y) the date on which such reclassification, consolidation, merger, sale, transfer or share exchange is 

  
 A-13

 
expected to become effective or close, and the date as of which it is expected that holders of the Common Stock of record shall be entitled to exchange their shares of the Common Stock for
securities, cash or other property deliverable upon such reclassification, consolidation, merger, sale, transfer or share exchange; provided that the failure to mail such notice or any defect therein or in the mailing thereof shall not affect the
validity of the corporate action required to be specified in such notice. To the extent that any notice provided hereunder constitutes, or contains, material, non-public information regarding the Company or any of the Subsidiaries, the Company shall
simultaneously file such notice with the Commission pursuant to a Current Report on Form 8-K. The Holder shall remain entitled to exercise this Warrant during the period commencing on the date of such notice to the effective date of the event
triggering such notice except as may otherwise be expressly set forth herein. 
 Section 4. Transfer of
Warrant. 
 a) Transferability. Subject to compliance with applicable securities laws, this Warrant
and all rights hereunder are transferable, in whole or in part, upon surrender of this Warrant at the principal office of the Company or its designated agent, together with a written assignment of this Warrant substantially in the form attached
hereto duly executed by the Holder or its agent or attorney and funds sufficient to pay any transfer taxes payable upon the making of such transfer. Upon such surrender and, if required, such payment, the Company shall execute and deliver a new
Warrant or Warrants in the name of the assignee or assignees, as applicable, and in the denomination or denominations specified in such instrument of assignment, and shall issue to the assignor a new Warrant evidencing the portion of this Warrant
not so assigned, and this Warrant shall promptly be cancelled. The Warrant, if properly assigned in accordance herewith, may be exercised by a new holder for the purchase of Warrant Shares without having a new Warrant issued. 

b) New Warrants. This Warrant may be divided or combined with other Warrants upon presentation hereof at the
aforesaid office of the Company, together with a written notice specifying the names and denominations in which new Warrants are to be issued, signed by the Holder or its agent or attorney. Subject to compliance with Section 4(a), as to any
transfer which may be involved in such division or combination, the Company shall execute and deliver a new Warrant or Warrants in exchange for the Warrant or Warrants to be divided or combined in accordance with such notice. All Warrants issued on
transfers or exchanges shall include reference to the initial issuance date set forth on the first page of this Warrant and shall be identical with this Warrant except as to the number of Warrant Shares issuable pursuant thereto and the Warrant
number. 
 c) Warrant Register. The Company shall register this Warrant, upon records to be maintained by
the Company for that purpose (the “Warrant Register”), in the name of the record Holder hereof from time to time. The Company may deem and treat the 

  
 A-14

 
registered Holder of this Warrant as the absolute owner hereof for the purpose of any exercise hereof or any distribution to the Holder, and for all other purposes, absent actual written notice
to the contrary. 
 Section 5. Miscellaneous. 

a) No Rights as Stockholder Until Exercise. This Warrant does not entitle the Holder to any voting rights,
dividends or other rights as a stockholder of the Company prior to the exercise hereof as set forth in Section 2(d)(i). 
 b) Loss, Theft, Destruction or Mutilation of Warrant. The Company covenants that upon receipt by the Company of evidence reasonably satisfactory to it of the loss, theft, destruction or mutilation
of this Warrant or any stock certificate relating to the Warrant Shares, and in case of loss, theft or destruction, of indemnity or security reasonably satisfactory to it, and upon surrender and cancellation of such Warrant or stock certificate, if
mutilated, the Company will make and deliver a new Warrant or stock certificate of like tenor, in lieu of such Warrant or stock certificate. 
 c) Saturdays, Sundays, Holidays, etc. If the last or appointed day for the taking of any action or the expiration of any right required or granted herein shall not be a business day, then, such
action may be taken or such right may be exercised on the next succeeding business day. 
 d) Authorized
Shares. The Company covenants that during the period the Warrant is outstanding, it will reserve from its authorized and unissued Common Stock a sufficient number of shares to provide for the issuance of the Warrant Shares upon the exercise of
any purchase rights under this Warrant. The Company further covenants that its issuance of this Warrant shall constitute full authority to its officers who are charged with the duty of executing stock certificates to execute and issue the necessary
certificates for the Warrant Shares upon the exercise of the purchase rights under this Warrant. The Company will take all such reasonable action as may be necessary to assure that such Warrant Shares may be issued as provided herein without
violation of any applicable law or regulation, or of any requirements of the Trading Market upon which the Common Stock may be listed. “Trading Market” means any of the following markets or exchanges on which the Common Stock is
listed or quoted for trading on the date in question: the NYSE AMEX, the Nasdaq Capital Market, the Nasdaq Global Market, the Nasdaq Global Select Market, the New York Stock Exchange or the OTC Bulletin Board (or any successors to any of the
foregoing). The Company covenants that all Warrant Shares which may be issued upon the exercise of the purchase rights represented by this Warrant will, upon exercise of the purchase rights represented by this Warrant and payment for such Warrant
Shares in accordance herewith, be duly authorized, validly issued, fully paid and nonassessable and free from all taxes, liens and charges created by the Company in respect of the issue thereof (other than taxes in respect of any transfer occurring
contemporaneously with such issue). 

  
 A-15

 Except and to the extent as waived or consented to by the Holder, the
Company shall not by any action, including, without limitation, amending its certificate of incorporation or through any reorganization, transfer of assets, consolidation, merger, dissolution, issue or sale of securities or any other voluntary
action, avoid or seek to avoid the observance or performance of any of the terms of this Warrant. Without limiting the generality of the foregoing, the Company will (i) not increase the par value of any Warrant Shares above the amount payable
therefor upon such exercise immediately prior to such increase in par value, (ii) take all such action as may be necessary or appropriate in order that the Company may validly and legally issue fully paid and nonassessable Warrant Shares upon
the exercise of this Warrant and (iii) use commercially reasonable efforts to obtain all such authorizations, exemptions or consents from any public regulatory body having jurisdiction thereof, as may be necessary to enable the Company to
perform its obligations under this Warrant. 
 Before taking any action which would result in an adjustment in
the number of Warrant Shares for which this Warrant is exercisable or in the Exercise Price, the Company shall obtain all such authorizations or exemptions thereof, or consents thereto, as may be necessary from any public regulatory body or bodies
having jurisdiction thereof. 
 e) Jurisdiction. All questions concerning the construction, validity,
enforcement and interpretation of this Warrant shall be determined in accordance with the laws of the State of New York. 
 f) Restrictions. The Holder acknowledges that the Warrant Shares acquired upon the exercise of this Warrant, if not registered, and the Holder does not utilize cashless exercise, will have
restrictions upon resale imposed by state and federal securities laws. 
 g) Nonwaiver and Expenses. No
course of dealing or any delay or failure to exercise any right hereunder on the part of Holder shall operate as a waiver of such right or otherwise prejudice Holder’s rights, powers or remedies. Without limiting any other provision of this
Warrant, if the Company or the Holder willfully and knowingly fails to comply with any provision of this Warrant, which results in any material damages to the other party, then such party shall pay to the other party such amounts as shall be
sufficient to cover any costs and expenses including, but not limited to, reasonable attorneys’ fees, including those of appellate proceedings, incurred by such party in collecting any amounts due pursuant hereto or in otherwise enforcing any
of its rights, powers or remedies hereunder. 
 h) Notices. Whenever notice is required to be given under
this Warrant, unless otherwise provided herein, such notice shall be given in writing, will be mailed (a) if within the domestic United States by first-class registered or certified airmail, or nationally recognized overnight express courier,
postage prepaid, or by facsimile or (b) if delivered from outside the United States, by International Federal Express or facsimile, and (c) will be deemed given (i) if delivered by first-class registered or certified mail

  
 A-16

 
domestic, three business days after so mailed, (ii) if delivered by nationally recognized overnight carrier, one business day after so mailed, (iii) if delivered by International
Federal Express, two business days after so mailed and (iv) if delivered by facsimile, upon electronic confirmation of receipt, and will be delivered and addressed as follows: 

 

	 	(i)	if to the Company, to: 

StemCells, Inc. 

7707 Gateway Boulevard, Suite 140 
 Newark, CA 94560 
 Attn: Rodney Young, Chief Financial Officer 

Facsimile: (510) 456-4001 
  

	 	with	a copy to: 

 Ropes &
Gray LLP 
 Prudential Tower 
 800 Boylston Street 
 Boston, MA 02199 

Attn: Marko Zatylny 
 Facsimile: (617) 235-0751 
  

	 	(ii)	if to the Holder, at the address of the Holder appearing on the books of the Company. 

i) Limitation of Liability. No provision hereof, in the absence of any affirmative action by Holder to exercise
this Warrant to purchase Warrant Shares, and no enumeration herein of the rights or privileges of Holder, shall give rise to any liability of Holder for the purchase price of any Common Stock or as a stockholder of the Company, whether such
liability is asserted by the Company or by creditors of the Company. 
 j) Remedies. The Holder and the
Company, in addition to being entitled to exercise all rights granted by law, including recovery of damages, will be entitled to specific performance of its rights under this Warrant. 

k) Successors and Assigns. Subject to applicable securities laws, this Warrant and the rights and obligations
evidenced hereby shall inure to the benefit of and be binding upon the successors and permitted assigns of the Company and the successors and permitted assigns of Holder. The provisions of this Warrant are intended to be for the benefit of any
Holder from time to time of this Warrant and shall be enforceable by the Holder or holder of Warrant Shares. 

l) Amendment. This Warrant is one of a series of Warrants of like tenor issued by the Company pursuant to the
Underwriting Agreement, dated as of December     , 2011, by and among the Company, Roth Capital Partners, LLC and Chardan Capital Markets, LLC (collectively, the “Series A Warrants”). Any term of this Warrant may
be 

  
 A-17

 
amended or waived (including the adjustment provisions included in Section 3 of this Warrant) upon the written consent of the Company and the holders of Series A Warrants representing at
least 66 2/3% of the number of shares of Common Stock then subject to all outstanding Series A Warrants (the “Required Holders”). 
 m) Severability. Wherever possible, each provision of this Warrant shall be interpreted in such manner as to be effective and valid under applicable law, but if any provision of this Warrant shall
be prohibited by or invalid under applicable law, such provision shall be ineffective to the extent of such prohibition or invalidity, without invalidating the remainder of such provisions or the remaining provisions of this Warrant. 

n) Headings. The headings used in this Warrant are for the convenience of reference only and shall not, for any
purpose, be deemed a part of this Warrant. 
 ******************** 

(Signature Page Follows) 

  
 A-18

 IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by its officer
thereunto duly authorized as of the date first above indicated. 
  

					
	STEMCELL, INC.
		
	By:	 	  

		 	Name:	 	
		 	Title:	 	

 NOTICE OF EXERCISE 
 TO: STEMCELLS, INC. 
 (1) The undersigned hereby elects to purchase
                 Warrant Shares of the Company pursuant to the terms of the attached Warrant (only if exercised in full), and tenders herewith payment of the exercise
price in full, together with all applicable transfer taxes, if any. By executing this notice, the undersigned Holder represents that it has complied with the Holder’s Exercise Limitations set forth in Section 2(e) of this Warrant.

 (2) Payment shall take the form of (check applicable box): 

 ̈ in lawful money of the United States; or 

 ̈ if permitted the cancellation of such number of Warrant Shares as is necessary, in
accordance with the formula set forth in subsection 2(c), to exercise this Warrant with respect to the maximum number of Warrant Shares purchasable pursuant to the cashless exercise procedure set forth in subsection 2(c). 

(3) Please issue a certificate or certificates representing said Warrant Shares in the name of the undersigned or in such other name as
is specified below: 
  
  

The Warrant Shares shall be delivered to the following DWAC Account Number or by physical delivery of a certificate to: 

 
  

 
  

 
  
 [SIGNATURE OF HOLDER] 
  

			
	Name of Investing Entity:	 	  

			
	Signature of Authorized Signatory of Investing Entity:	 	  

			
	Name of Authorized Signatory:	 	  

			
	Title of Authorized Signatory:	 	  

			
	Date:	 	  

 ASSIGNMENT FORM 

(To assign the foregoing warrant, execute this form and supply required information. Do not use this form to exercise the warrant.)

 FOR VALUE RECEIVED, [            ] all of or
[                ] shares of the foregoing Warrant and all rights evidenced thereby are hereby assigned to 
                                  
                                         
                                         
                      whose address is 
                                  
                                         
                                         
                                         
                                         
       . 

                         
                                         
                                         
                                         
                                         
                
 Dated:
            ,          
  

							
		  	Holder’s Signature:	  	  
	  	
				
		  	Holder’s Address:	  	  
	  	
				
		  		  	  
	  	

  

							
	Signature Guaranteed:	  	  
	  	

 NOTE: The signature to this Assignment Form must correspond with the name as it appears on the face of the Warrant,
without alteration or enlargement or any change whatsoever, and must be guaranteed by a bank or trust company. Officers of corporations and those acting in a fiduciary or other representative capacity should file proper evidence of authority to
assign the foregoing Warrant.Form of Series B Warrant

 Exhibit 4.2 
 Void after 5:00 p.m. (New York time) on            , 2012. 

 

			
	Warrant Certificate No.	  	Issue Date: December    , 2011

 STEMCELLS, INC. 
 (A corporation existing under the laws of the State of Delaware) 
 THIS SERIES B
WARRANT TO PURCHASE UNITS (the “Warrant”) certifies that, for value received,            (the “Holder”), is entitled, upon the terms and subject to the
limitations on exercise and the conditions hereinafter set forth, at any time on or after the Issue Date and on or prior to 5:00 p.m. (New York time) on the ninetieth (90th) trading day after the Issue Date (the “Expiration
Date”) (subject to extension as provided below) but not thereafter, to subscribe for and purchase from StemCells, Inc., a Delaware corporation (the “Company”), up to
            Units (subject to adjustment as provided herein), with each Unit consisting of (i) one share of Common Stock, par value $0.01 per share (the “Common
Stock”) of the Company (an “Option Share”) and (ii) one Series A Warrant in the form attached hereto as Exhibit A to purchase one share of Common Stock (a “Option Series A Warrant Share”);
provided, however, that the Expiration Date shall be extended by the aggregate number of days between the Issue Date and the Expiration Date of which the registration statement registering the Option Shares and Option Series A Warrant
Shares is not effective, or no current prospectus is available, such that the Holder is not permitted to sell its Option Shares or its Option Series A Warrant Shares. The purchase price of one Unit under this Warrant shall be equal to the Exercise
Price, as defined in Section 2(b). 
 Section 1. Definitions. Capitalized terms used and not otherwise
defined herein shall have the meanings set forth in the Series A Warrant. 
 Section 2. Exercise. 

a) Exercise of Warrant. Subject to the conditions set forth in this Section 2, exercise of the purchase rights
represented by this Warrant may be made, in whole or in part, at any time or times on or after the Issue Date and on or before the Expiration Date (the “Exercise Period”) by delivery to the principal office of the Company of a duly
executed copy of the Notice of Exercise Form annexed hereto (or to such other office or agency of the Company as it may designate by notice in writing to the registered Holder at the address of such Holder appearing on the books of the Company). If
this Warrant is to be exercised in full, the Holder shall surrender this Warrant to the Company concurrently with the delivery of the Notice of Exercise Form. Notwithstanding anything herein to the contrary, the Holder shall not be required to
physically surrender this Warrant to the Company until the Holder has purchased all of the Units available hereunder and the Warrant has been exercised in full. Partial exercises of this Warrant resulting in purchases of a portion of the total
number of Units available hereunder shall have the effect of lowering the outstanding number of Units purchasable hereunder in an amount equal to the applicable number of Units purchased. The Holder and the Company shall maintain records showing the
number of Units purchased and the date of such purchases. The Holder and any assignee, by acceptance of this Warrant, acknowledge and agree that, by reason of the provisions of this paragraph, following the purchase of a portion of the Units
hereunder, the number of Units available for purchase hereunder at any given time may be less than the amount stated on the face hereof. Notwithstanding anything herein to the contrary, subject to the limitations set forth in Section 2(c), each
exercise of this Warrant shall be for a minimum amount equal to the lesser of (i) $100,000 or (ii) the then outstanding aggregate Exercise Price of this Warrant. 

b) Exercise Price. “Exercise Price” means $        per
Unit, subject to adjustment as provided in this Warrant. 
 c) Percentage Limitation. Notwithstanding
anything herein to the contrary, the Company shall not issue to any Holder any Units, including pursuant to any rights herein, including, without 

  
 B-1

 
limitation, any exercise rights, to the extent that the Option Shares and the Option Series A Warrant Shares underlying such Units, when added to the number of shares of Common Stock then
beneficially owned by such Holder and any Persons whose beneficial ownership of Common Stock would be aggregated with such Holder for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended (the “Exchange
Act”), would cause the total number of shares of Common Stock beneficially owned by such Holder and any such Persons to exceed 9.999% of the total number of outstanding shares of Common Stock of the Company at the time of such issuance (the
“Maximum Aggregate Share Amount”), provided, however, that this Section 2(c) shall not apply to the exercise of this Warrant in connection with any Fundamental Transaction in which the Company is acquired by a third party,
whether by merger or stock purchase. Upon the reasonable written or oral request of the Holder, the Company shall within two (2) business days confirm orally and in writing to such Holder the number of shares of Common Stock then outstanding.
For purposes of this Section 2(c), beneficial ownership shall be determined in accordance with Section 13(d) of the Exchange Act and the rules and regulations promulgated thereunder. To the extent that the limitation contained in this
Section 2(c) applies, the determination of whether this Warrant is exercisable (in relation to other securities owned by the Holder together with any affiliates) and of which portion of this Warrant is exercisable shall be in the sole
discretion of the Holder, and the submission of a Notice of Exercise shall be deemed to be the Holder’s determination of whether this Warrant is exercisable (in relation to other securities owned by the Holder together with any affiliates) and
of which portion of this Warrant is exercisable, in each case subject to the Maximum Aggregate Share Amount, and the Company shall have no obligation to verify or confirm the accuracy of such determination and shall have no liability for exercises
of the Warrant that are in non-compliance with the Maximum Aggregate Share Amount. 
 d) Authorization of
Underlying Shares. The Company covenants that all Option Shares and Series A Warrants which may be issued upon the exercise of the purchase rights represented by this Warrant, and all Option Series A Warrant Shares which may be issued upon the
exercise of the purchase rights represented by the Series A Warrants contained within the Units will, upon exercise of the purchase rights represented by this Warrant or the Series A Warrants, as applicable, and payment to the Company of the
purchase price therefor, be duly authorized, validly issued, fully paid and nonassessable and free from all taxes, liens and charges in respect of the issue thereof (other than taxes in respect of any transfer occurring contemporaneously with such
issue). 
 e) Delivery of New Warrants Upon Exercise. If this Warrant shall have been exercised in part,
the Company shall, at the request of a Holder and upon surrender of this Warrant certificate, at the time of delivery of the certificate or certificates representing Units, deliver to Holder a new Warrant evidencing the rights of Holder to purchase
the unpurchased Units called for by this Warrant, which new Warrant shall in all other respects be identical with this Warrant. 
 f) No Fractional Shares or Scrip. No fractional Option Shares or scrip representing fractional Option Shares shall be issued upon exercise of this Warrant. As to any fraction of an Option Share
that Holder would otherwise be entitled to purchase upon such exercise, the Company shall pay a cash adjustment in respect of such final fraction in an amount equal to such fraction multiplied by the Exercise Price. Upon any exercise of this
Warrant, no Series A Warrant shall be issued exercisable for fractional shares of Common Stock. The aggregate number of shares of Common Stock issuable upon exercise of such Series A Warrant shall be rounded down to the nearest whole share and any
fractional shares of Common Stock that are not required to be issued by reason of this Section 2(f) shall be carried forward and shall be taken into account in the subsequent exercise of this Warrant. Whether or not a Series A Warrant
exercisable for fractional shares of Common Stock would be issuable upon any exercise of this Warrant shall be determined on the basis of the total number of Units being exercised at the time and the aggregate number of Series A Warrants issuable
upon such exercise. 
 g) Legends. The Option Shares and Option Series A Warrant Shares issued pursuant to
this Warrant shall be issued free of all legends on the Exercise Date. 

  
 B-2

 h) Charges, Taxes and Expenses. Issuance of certificates for Option
Shares and/or Series A Warrants shall be made without charge to the Holder for any issue or transfer tax or other incidental expense in respect of the issuance of such certificate, all of which taxes and expenses shall be paid by the Company, and
such certificates shall be issued in the name of the Holder or in such name or names as may be directed by the Holder; provided, however, that in the event certificates for Option Shares and/or Series A Warrants are to be issued in a name other than
the name of the Holder, this Warrant when surrendered for exercise shall be accompanied by the Assignment Form attached hereto duly executed by the Holder; and the Company may require, as a condition thereto, the payment of a sum sufficient to
reimburse it for any transfer tax incidental thereto. 
 i) Mechanics of Exercise. 

i. [RESERVED] 
 ii. Exercise Date Deliveries. No later than three (3) business days following the receipt by the Company of (i) the completed Notice of Exercise Form, (ii) payment of the related
Exercise Price, and (iii), if this Warrant is being exercised in full, this Warrant (such date, the “Exercise Date”), the Company shall deliver or cause to be delivered to the Holder the following: 

(A) the Option Shares included in the Units purchased as a result of the exercise of this Warrant, registered in the name
of the Holder, which shall be transmitted by the transfer agent of the Company to the Holder by crediting the account of the Holder’s prime broker with The Depository Trust Company through its Deposit or Withdrawal at Custodian system
(“DWAC”) if the Company is a participant in such system, and otherwise by physical delivery to an address specified by the Holder in the Notice of Exercise Form; and 

(B) the Series A Warrants included in the Units purchased as a result of the exercise of this Warrant, registered in the
name of the Holder, which shall be transmitted by physical delivery to an address specified by the Holder in the Notice of Exercise Form. 
 iii. Rescission Rights. If the Company fails to cause the transfer agent to transmit to the Holder a certificate or the certificates representing the Option Shares or the Series A Warrants pursuant
to Section 2(i)(ii) by the Exercise Date, then, the Holder will have the right to rescind such exercise. 

iv. Compensation for Buy-In on Failure to Timely Deliver Certificates Upon Exercise. In addition to any other
rights available to the Holder, if by the close of the fifth business day after delivery of a notice of exercise the Company fails to cause the transfer agent to transmit to the Holder a certificate or the certificates representing the Option Shares
pursuant to an exercise on or before the Exercise Date, and if after such Exercise Date, the Holder purchases (in an open market transaction or otherwise) shares of Common Stock to deliver in satisfaction of a sale by the Holder of the Option Shares
that the Holder anticipated receiving from the Company (a “Buy-In”), then the Company shall, within five (5) business days after the Holder’s request and in the Holder’s discretion, either (i) pay cash to the
Holder in an amount, equal to the Holder’s total purchase price (including reasonable brokerage commissions, if any) for the shares of Common Stock so purchased (the “Buy-In Price”), at which point the Company’s obligation
to deliver such certificate (and to issue such Common Stock) shall terminate, or (ii) promptly honor its obligation to deliver to the Holder a certificate or certificates representing such Option Shares and pay cash to the Holder in an amount
equal to the excess (if any) of the Buy-In Price over the product of (A) such number of shares of Option Shares, times (B) the VWAP (as reported by Bloomberg, L.P.) on the date of the event giving rise to the Company’s obligation to
deliver such certificate. 

  
 B-3

 Notwithstanding the foregoing, the Company shall not be required to make the payments set
forth herein in the case of uncertificated Option Shares if the Holder fails to timely file a request with the depository trust company to receive such uncertificated Option Shares. 

Notwithstanding the foregoing, if the Company fails to cause the transfer agent to transmit to the Holder a certificate or the
certificates representing the Option Shares pursuant to an exercise on or before the Exercise Date, then the Holder will have the right to rescind such Notice of Exercise. Nothing herein shall limit a Holder’s right to pursue any other remedies
available to it hereunder, at law or in equity including, without limitation, a decree of specific performance and/or injunctive relief with respect to the Company’s failure to timely deliver a certificate pursuant to the terms hereof.

 For purposes of this Section, “VWAP” means, for any date, the price determined by the first of the following
clauses that applies: (a) if the Common Stock is then listed or quoted on a market or exchange, the daily volume weighted average price of the Common Stock for such date (or the nearest preceding date) on such market or exchange on which the
Common Stock is then listed or quoted as reported by Bloomberg L.P. (based on a business day from 9:30 a.m. (New York City time) to 4:02 p.m. (New York City time)), (b) if the OTC Bulletin Board is not a market or exchange, the volume weighted
average price of the Common Stock for such date (or the nearest preceding date) on the OTC Bulletin Board, (c) if the Common Stock is not then listed or quoted for trading on the OTC Bulletin Board and if prices for the Common Stock are then
reported in the “Pink Sheets” published by Pink OTC Markets, Inc. (or a similar organization or agency succeeding to its functions of reporting prices), the most recent bid price per share of the Common Stock so reported, or (d) in
all other cases, the fair market value of a share of Common Stock as determined by an independent appraiser selected in good faith by the Company and reasonably acceptable to the Required Holders (as defined herein), the fees and expenses of which
shall be paid by the Company. 
 Section 3. Certain Adjustments. 

a) Stock Dividends and Splits. If the Company, at any time while this Warrant is outstanding: (A) pays a stock
dividend or otherwise makes a distribution or distributions on shares of its Common Stock or any other equity or equity equivalent securities payable in shares of Common Stock (which, for avoidance of doubt, shall not include any Option Shares or
Series A Warrants issued by the Company pursuant to this Warrant), (B) subdivides outstanding shares of Common Stock into a larger number of shares, (C) combines (including by way of reverse stock split) outstanding shares of Common Stock
into a smaller number of shares, or (D) issues by reclassification of shares of the Common Stock any shares of capital stock of the Company, then in each case the Exercise Price shall be multiplied by a fraction, of which the numerator shall be
the number of shares of Common Stock (excluding treasury shares, if any) outstanding immediately before such event and of which the denominator shall be the number of shares of Common Stock outstanding immediately after such event and the number of
Units issuable upon exercise of this Warrant shall be proportionately adjusted in an inverse manner (e.g., an increase in the Exercise Price shall result in a decrease in the number of Units) such that the aggregate Exercise Price of this
Warrant shall remain unchanged. Any adjustment made pursuant to this Section 3(a) shall become effective immediately after the record date for the determination of stockholders entitled to receive such dividend or distribution and shall become
effective immediately after the effective date in the case of a subdivision, combination or re-classification. 

b) [Reserved] 

  
 B-4

 c) Subsequent Rights Offerings. In addition to any adjustments
pursuant to Section 3(a) above, if at any time the Company grants, issues or sells any Common Stock Equivalents or rights to purchase stock, warrants, securities or other property pro rata to the record holders of any class of shares of Common
Stock (the “Purchase Rights”), then the Holder will be entitled to acquire, upon the terms applicable to such Purchase Rights, the aggregate Purchase Rights which the Holder could have acquired if the Holder had held the number of
shares of Common Stock acquirable upon complete exercise of this Warrant (without regard to any limitations on exercise hereof, including without limitation, the Maximum Aggregate Share Amount) immediately before the date on which a record is taken
for the grant, issuance or sale of such Purchase Rights, or, if no such record is taken, the date as of which the record holders of shares of Common Stock are to be determined for the grant, issue or sale of such Purchase Rights (provided, however,
to the extent that the Holder’s right to participate in any such Purchase Right would result in the Holder exceeding the Maximum Aggregate Share Amount, then the Holder shall not be entitled to participate in such Purchase Right to such extent
(or beneficial ownership of such shares of Common Stock as a result of such Purchase Right to such extent) and such Purchase Right to such extent shall be held in abeyance for the Holder until such time, if ever, as its right thereto would not
result in the Holder exceeding the Maximum Aggregate Share Amount). 
 d) Fundamental Transaction. If, at
any time while this Warrant is outstanding, (i) the Company, directly or indirectly, in one or more related transactions effects any merger or consolidation of the Company with or into another Person, (ii) the Company, directly or
indirectly, effects any sale, lease, license, assignment, transfer, conveyance or other disposition of all or substantially all of its assets in one or a series of related transactions, (iii) any, direct or indirect, purchase offer, tender
offer or exchange offer (whether by the Company or another Person) is completed pursuant to which holders of Common Stock are permitted to sell, tender or exchange their shares for other securities, cash or property and has been accepted by the
holders of 50% or more of the outstanding Common Stock, (iv) the Company, directly or indirectly, in one or more related transactions effects any reclassification, reorganization or recapitalization of the Common Stock or any compulsory share
exchange pursuant to which the Common Stock is effectively converted into or exchanged for other securities, cash or property (other than as provided for under Section 3(a)), or (v) the Company, directly or indirectly, in one or more
related transactions consummates a stock or share purchase agreement or other business combination (including, without limitation, a reorganization, recapitalization, spin-off or scheme of arrangement) with another Person whereby such other Person
acquires more than 50% of the outstanding shares of Common Stock (not including any shares of Common Stock held by the other Person or other Persons making or party to, or associated or affiliated with the other Persons making or party to, such
stock or share purchase agreement or other business combination) (each a “Fundamental Transaction”), then, upon any subsequent exercise of this Warrant, the Holder shall have the right to receive, for each Option Share that would
have been issuable upon such exercise immediately prior to the occurrence of such Fundamental Transaction, the number of shares of Common Stock of the successor or acquiring corporation or of the Company, if it is the surviving corporation, and any
additional consideration (the “Alternate Consideration”) receivable upon or as a result of such reorganization, reclassification, merger, consolidation or disposition of assets by a Holder of the number of shares of Common Stock for
which this Warrant is exercisable immediately prior to such event. For purposes of clarity, no bona fide underwritten offering of the Company’s securities will be deemed to be a Fundamental Transaction. For purposes of any such exercise, the
determination of the Exercise Price shall be appropriately adjusted to apply to such Alternate Consideration based on the amount of Alternate Consideration issuable in respect of one share of Common Stock in such Fundamental Transaction, and the
Company shall apportion the Exercise Price among the Alternate Consideration in a reasonable manner reflecting the relative value of any different components of the Alternate Consideration. If holders of Common Stock are given any choice as to the
securities, cash or property to be received in a Fundamental Transaction, then the Holder shall be given the same choice as to the Alternate Consideration it receives upon any exercise of this Warrant following such Fundamental Transaction. To the
extent necessary to effectuate the foregoing provisions, any successor to the Company or surviving entity in such Fundamental Transaction shall issue to the Holder a new warrant consistent with the foregoing provisions and evidencing the
Holder’s right to exercise such warrant into Alternate Consideration. 

  
 B-5

 
The terms of any agreement pursuant to which a Fundamental Transaction is effected shall include terms requiring any such successor or surviving entity to comply with the provisions of this
Section 3(c) and insuring that this Warrant (or any such replacement security) will be similarly adjusted upon any subsequent transaction analogous to a Fundamental Transaction. 

e) Calculations. All calculations under this Section 3 shall be made to the nearest cent or the nearest
1/100th of a share, as the case may be. For purposes of this Section 3, the number of shares of Common Stock deemed to be issued and outstanding as of a given date shall be the sum of the number of shares of Common Stock (excluding treasury
shares, if any) issued and outstanding. 
 f) Notice to Holders. 

i. Adjustment to Exercise Price. Whenever the Exercise Price is adjusted pursuant to this Section 3, the
Company shall promptly mail to each Holder a notice setting forth the Exercise Price after such adjustment and setting forth a brief statement of the facts requiring such adjustment. 

ii. Notice to Allow Exercise by Holder. If during the term in which this Warrant may be exercised by the Holder
(A) the Company shall declare a dividend (or any other distribution) on the Common Stock; (B) the Company shall declare a special nonrecurring cash dividend on or a redemption of the Common Stock; (C) the Company shall authorize the
granting to all holders of the Common Stock rights or warrants to subscribe for or purchase any shares of capital stock of any class or of any rights; (D) the approval of any stockholders of the Company shall be required in connection with any
reclassification of the Common Stock, any consolidation or merger to which the Company is a party, any sale or transfer of all or substantially all of the assets of the Company, of any compulsory share exchange whereby the Common Stock is converted
into other securities, cash or property; (E) the Company shall authorize the voluntary or involuntary dissolution, liquidation or winding up of the affairs of the Company; then, in each case, the Company shall cause to be mailed to the Holder
at its last address as it shall appear upon the Warrant Register of the Company, at least 10 calendar days prior to the applicable record or effective date hereinafter specified, a notice stating (x) the date on which a record is to be taken
for the purpose of such dividend, distribution, redemption, rights or warrants, or if a record is not to be taken, the date as of which the holders of the Common Stock of record to be entitled to such dividend, distributions, redemption, rights or
warrants are to be determined or (y) the date on which such reclassification, consolidation, merger, sale, transfer or share exchange is expected to become effective or close, and the date as of which it is expected that holders of the Common
Stock of record shall be entitled to exchange their shares of the Common Stock for securities, cash or other property deliverable upon such reclassification, consolidation, merger, sale, transfer or share exchange; provided, in each case that such
information shall be made known to the public through a press release, filing with the Commission, or other public announcement prior to or in conjunction with such notice being provided to the Holder, and provided further that the failure to mail
such notice or any defect therein or in the mailing thereof shall not affect the validity of the corporate action required to be specified in such notice. If this Warrant is then exercisable pursuant to the terms hereof, the Holder shall be entitled
to exercise this Warrant during the 10-day period commencing on the date of such notice to the effective date of the event triggering such notice. 
 Section 4. Transfer of Warrant. 
 a)
Transferability. This Warrant and all rights hereunder are transferable, in whole or in part and with the Company’s consent (which shall not be unreasonably withheld), upon surrender of this Warrant at the principal office of the
Company, together with a written assignment of this Warrant 

  
 B-6

 
substantially in the form attached hereto duly executed by the Holder or its agent or attorney and funds sufficient to pay any transfer taxes payable upon the making of such transfer. Upon such
surrender and, if required, such payment, the Company shall execute and deliver a new Warrant or Warrants in the name of the assignee or assignees and in the denomination or denominations specified in such instrument of assignment, and shall issue
to the assignor a new Warrant evidencing the portion of this Warrant not so assigned, and this Warrant shall promptly be cancelled. A Warrant, if properly assigned, may be exercised by a new holder for the purchase of Units without having a new
Warrant issued. 
 b) New Warrants. This Warrant may be divided or combined with other Warrants upon
presentation hereof at the aforesaid office of the Company, together with a written notice specifying the names and denominations in which new Warrants are to be issued, signed by the Holder or its agent or attorney. Subject to compliance with
Section 4(a), as to any transfer which may be involved in such division or combination, the Company shall execute and deliver a new Warrant or Warrants in exchange for the Warrant or Warrants to be divided or combined in accordance with such
notice. 
 c) Warrant Register. The Company shall register this Warrant, upon records to be maintained by
the Company for that purpose (the “Warrant Register”), in the name of the record Holder hereof. The Company may deem and treat the registered Holder of this Warrant as the absolute owner hereof for the purpose of any exercise hereof
or any distribution to the Holder, and for all other purposes, absent actual notice to the contrary. 
 Section 5.
Miscellaneous. 
 a) Fees and Expenses. The Company shall pay all transfer agent fees, stamp taxes
and other taxes and duties levied in connection with the delivery of any securities to the Holder, subject to Section 2(h) hereof. 
 b) No Rights as Stockholder Until Exercise. This Warrant does not entitle the Holder to any voting rights or other rights as a stockholder of the Company prior to the exercise hereof. Upon the
surrender of this Warrant and the payment of the aggregate Exercise Price, the Units so purchased shall be and be deemed to be issued to such Holder as the record owner of such shares as of the close of business on the later of the date of such
surrender or payment. 
 c) Loss, Theft, Destruction or Mutilation of Warrant. The Company covenants that
upon receipt by the Company of evidence reasonably satisfactory to it of the loss, theft, destruction or mutilation of this Warrant or any certificate relating to the Option Shares and/or Series A Warrants, and in case of loss, theft or destruction,
of indemnity or security reasonably satisfactory to it (which, in the case of this Warrant or the Series A Warrants, shall not include the posting of any bond), and upon surrender and cancellation of such warrant or stock certificate, if mutilated,
the Company will make and deliver a new warrant or stock certificate of like tenor and dated as of such cancellation, in lieu of such warrant or stock certificate. 

d) Saturdays, Sundays, Holidays, etc. If the last or appointed day for the taking of any action or the expiration
of any right required or granted herein shall not be a business day, then such action may be taken or such right may be exercised on the next succeeding business day. 

e) Authorized Shares. The Company covenants that during the period the Warrant is outstanding, it will maintain a
reserve, free from preemption rights, from its duly authorized shares of Common Stock for issuance in such amount as may be required to fulfill its obligations in full under this Warrant and any Series A Warrant issuable hereunder. The Company
further covenants that its issuance of this Warrant shall constitute full authority to its officers who are charged with the duty of executing stock certificates and warrant certificates to execute and issue the necessary certificates for

  
 B-7

 
the Option Shares and Series A Warrants upon the exercise of the purchase rights under this Warrant. The Company will take all such reasonable action as may be necessary to assure that such
Option Shares and Series A Warrants may be issued as provided herein without violation of any applicable law or regulation, or of any requirements of the Trading Market upon which the Common Stock may be listed. If at any time prior to the
Expiration Date the number of authorized but unissued shares of Common Stock shall not be sufficient to permit exercise of this Warrant, the Company will take such corporate action as may, in the opinion of its counsel, be necessary to increase its
authorized but unissued shares of Common Stock (or other securities as provided herein) to such number of shares as shall be sufficient for such purposes. 
 Except and to the extent as waived or consented to by the Holder, the Company hereby covenants to not by any action, including, without limitation, amending its certificate of incorporation, bylaws or
through any reorganization, transfer of assets, consolidation, merger, dissolution, issue or sale of securities or any other voluntary action, avoid or seek to avoid the observance or performance of any of the terms of this Warrant. Without limiting
the generality of the foregoing, the Company will (a) not increase the par value of any Option Shares above the Exercise Price then in effect and (b) take all such action as may be necessary or appropriate in order that the Company may
validly and legally issue fully paid and nonassessable Option Shares and Series A Warrants upon the exercise of this Warrant. 
 f) Jurisdiction. All questions concerning the construction, validity, enforcement and interpretation of this Warrant shall be determined in accordance with the laws of the State of New York.

 g) Restrictions. The Holder acknowledges that the Option Shares and the Series A Warrants acquired upon
the exercise of this Warrant, if not registered, will have restrictions upon resale imposed by state and federal securities laws. 
 h) Nonwaiver and Expenses. No course of dealing or any delay or failure to exercise any right hereunder on the part of Holder shall operate as a waiver of such right or otherwise prejudice
Holder’s rights, powers or remedies, notwithstanding the fact that all rights hereunder terminate on the Expiration Date. The Company’s obligations to issue and deliver Units in accordance with the terms hereof shall not be affected by the
recovery of any judgment against any Person or any action to enforce the same, or any setoff, counterclaim or recoupment, or any violation or alleged violation of law by the Holder or any other Person. If the Company or the Holder willfully and
knowingly fails to comply with any provision of this Warrant, which results in any material damages to the other party, then such party shall pay the other party such amounts as shall be sufficient to cover any costs and expenses incurred by such
party in collecting any amounts due pursuant hereto or in otherwise enforcing any of its rights, powers or remedies hereunder. 
 i) Notices. Whenever notice is required to be given under this Warrant, unless otherwise provided herein, such notice shall be given in writing, will be mailed (a) if within the domestic
United States by first-class registered or certified airmail, or nationally recognized overnight express courier, postage prepaid, or by facsimile or (b) if delivered from outside the United States, by International Federal Express or
facsimile, and (c) will be deemed given (i) if delivered by first-class registered or certified mail domestic, three business days after so mailed, (ii) if delivered by nationally recognized overnight carrier, one business day after
so mailed, (iii) if delivered by International Federal Express, two business days after so mailed and (iv) if delivered by facsimile, upon electronic confirmation of receipt, and will be delivered and addressed as follows: 

 

	 	(i)	if to the Company, to: 

StemCells, Inc. 

7707 Gateway Boulevard, Suite 140 
 Newark, CA 94560 
 Attn: Rodney Young, Chief Financial Officer 

Facsimile: (510) 456-4001 

  
 B-8

 with a copy to: 
 Ropes & Gray LLP 
 Prudential Tower 

800 Boylston Street 
 Boston, MA 02199 
 Attn: Marko Zatylny 

Facsimile: (617) 235-0751 
  

	 	(ii)	if to the Holder, at the address of the Holder appearing on the books of the Company. 

j) Limitation of Liability. No provision hereof, in the absence of any affirmative action by Holder to exercise
this Warrant or purchase Units, and no enumeration herein of the rights or privileges of Holder, shall give rise to any liability of Holder for the purchase price of any Common Stock or as a stockholder of the Company, whether such liability is
asserted by the Company or by creditors of the Company. 
 k) Remedies. The remedies provided in this
Warrant shall be cumulative and in addition to all other remedies available or granted by law, including recovery of damages. Each of the parties hereto will be entitled to specific performance of its rights under this Warrant. 

l) Successors and Assigns. Subject to applicable securities laws, this Warrant and the rights and obligations
evidenced hereby shall inure to the benefit of and be binding upon the successors of the Company and the successors and permitted assigns of Holder. The provisions of this Warrant are intended to be for the benefit of all Holders from time to time
of this Warrant and shall be enforceable by any such Holder or holder of Units. 
 m) Amendment. This
Warrant is one of a series of Warrants of like tenor issued by the Company pursuant to the Underwriting Agreement, dated as of December     , 2011, by and among the Company, Roth Capital Partners, LLC and Chardan Capital Markets,
LLC (collectively, the “Series B Warrants”). Any term of this Warrant may be amended or waived (including the adjustment provisions included in Section 3 of this Warrant) upon the written consent of the Company and the holders
of Series B Warrants representing at least 66 2/3% of the number of Units then subject to all outstanding Series B Warrants (the “Required Holders”). 

n) Severability. Wherever possible, each provision of this Warrant shall be interpreted in such manner as to be
effective and valid under applicable law, but if any provision of this Warrant shall be prohibited by or invalid under applicable law, such provision shall be ineffective to the extent of such prohibition or invalidity, without invalidating the
remainder of such provisions or the remaining provisions of this Warrant. 
 o) Headings. The headings
used in this Warrant are for the convenience of reference only and shall not, for any purpose, be deemed a part of this Warrant. 

[Signature Page Follows] 

  
 B-9

 IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by its officer
thereunto duly authorized. 
 Dated: December    , 2011 

 

			
	STEMCELLS, INC.
		
	By:	 	  

	Name:	 	
	Title:	 	

 EXHIBIT A 
 Form of Series A Warrant 

 NOTICE OF EXERCISE 
 TO: STEMCELLS, INC. 
 (1) The undersigned hereby elects to purchase
                     Units of the Company pursuant to the terms of the attached Warrant (only if exercised in full), and tenders herewith
payment of the Exercise Price in full, together with all applicable transfer taxes, if any. By executing this notice of exercise form, the undersigned Holder represents that it has complied with the percentage limitation provisions of
Section 2(c) of this warrant. 
 (2) Please issue a certificate or certificates representing said securities in the name of
the undersigned or in such other name as is specified below: 
  
  

The Units shall be delivered to the following: 
  

 
  

 
  

 
 Name of Investing Entity:
             

                         
                                         
                                         
                                      

Signature of Authorized Signatory of Investing Entity:              

                         
                                         
                               
 Name of Authorized Signatory:              
                                  
                                         
                                         
                  
 Title of Authorized Signatory:
             

                         
                                         
                                         
                            
 Date:              
  

 
 (Check one of the following)

  

	 ̈	The exercise of the attached Warrant was solicited
by                    (name of broker-dealer). 

  

	 ̈	The exercise of the attached Warrant was unsolicited. 

 As required by FINRA Rule 5110(f)(2)(K), no solicitation fee will be payable to the underwriters with respect to the exercise of a Series B Warrant if: 

 

	 	•	 	 the market price of the underlying shares of Common Stock is lower than the exercise price of the Series B Warrant at the time of exercise;

  

	 	•	 	 the Series B Warrant is held in a discretionary account of an underwriter at the time of exercise, unless prior specific written approval for the
exercise is received from the holder; 

  

	 	•	 	 the arrangement to pay the solicitation fee is not disclosed in any prospectus provided to the holder of the Series B Warrant at the time of exercise;

  

	 	•	 	 the Series B Warrant is exercised in an unsolicited transaction; or 

 

	 	•	 	 the holder of the Series B Warrant has not confirmed in writing that exercise was solicited and that the underwriters solicited the exercise.

 ASSIGNMENT FORM 

(To assign the foregoing warrant, execute 
 this form and supply required information. 
 Do not use this form to exercise the
warrant.) 
 FOR VALUE RECEIVED, the foregoing Warrant and all rights evidenced thereby are hereby assigned to: 

 
  
 whose address is: 
  
  

 
  
 Dated:
                                    ,
              
 Holder’s Signature:
                                         
                                         
                   
 Holder’s Address:
                                         
                                         
                     

                         
       
                                         
                                         
                      
 Signature
Guaranteed:
                                         
                                         
              
 NOTE: The signature to this Assignment Form must correspond
with the name as it appears on the face of the Warrant, without alteration or enlargement or any change whatsoever, and must be guaranteed by a bank or trust company. Officers of corporations and those acting in a fiduciary or other representative
capacity should file proper evidence of authority to assign the foregoing Warrant.

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