Document:

Exhibit
10.8

 

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

 

AS
OF THE DATE OF THE PURCHASE AGREEMENT AND INITIAL ISSUE DATE OF THE PREFERRED STOCK, THE COMPANY IS SUBJECT TO THE REQUIREMENTS
OF NASDAQ LISTING RULE 5635(D). FOR SO LONG AS NASDAQ LISTING RULE 5635(D) APPLIES TO THE COMPANY.

 

 CLASS A COMMON STOCK PURCHASE WARRANT

 

SIGMA
LABS, INC.

 

	Warrant
    Shares: [REQUIRES COMPLETION]	Issuance
    Date: January __, 2020

 

Warrant
No: 2020-001

 

THIS
COMMON STOCK PURCHASE WARRANT (the “Warrant”) certifies that, for value received, [REQUIRES COMPLETION],
or its registered assigns (the “Holder”), with an address at: [REQUIRES COMPLETION], is entitled, upon
the terms and subject to the limitations on exercise and the conditions hereinafter set forth, at any time commencing on the later
to occur of Shareholder Approval or one hundred and eighty (180) days after the date hereof (the “Initial Exercise Date”)
and on or prior to the close of business on the five (5) year anniversary of the Initial Exercise Date (the “Termination
Date”) but not thereafter, to subscribe for and purchase from SIGMA LABS, INC., a Nevada corporation (the “Company”),
up to [REQUIRES COMPLETION] shares (as subject to adjustment hereunder, the “Warrant Shares”) of Common
Shares. The purchase price of one Common Share 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 that certain
Securities Purchase Agreement (the “Purchase Agreement”), dated January __, 2020, among the Company and the purchasers
signatory thereto and the Note issued to the Holder contemporaneously with this Warrant.

 

    	 	 	 

    	 	 	 

    

 

Section
2. Exercise.

 

(a)
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 Initial Exercise 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. Within two (2) Trading Days following
the date of exercise as aforesaid, the Holder shall deliver the aggregate Exercise Price for the shares specified in the applicable
Notice of Exercise by wire transfer or cashier’s check drawn on a United States bank unless the cashless exercise procedure
specified in Section 2(c) below is specified in the applicable Notice of Exercise. Notwithstanding anything herein to the
contrary (although the Holder may surrender the Warrant to, and receive a replacement Warrant from, the Company), 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) Trading 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. The Holder and the Company shall maintain records showing the number of Warrant Shares purchased and the date
of such purchases. The Company shall deliver any objection to any Notice of Exercise Form within one (1) Trading Day of delivery
of such notice. 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 Shares under this Warrant shall be US$[REQUIRES COMPLETION],
subject to adjustment as described herein (“Exercise Price”). The Company shall have the right in its sole
discretion to reduce the Exercise Price at any time and from time to time.

 

(c)
Cashless Exercise. If at any time commencing six months after the Issuance Date, there is no effective registration statement
registering the Warrant Shares, or no current prospectus available for the resale of the Warrant Shares by the Holder, then this
Warrant may also be exercised at the Holder’s election, in whole or in part, at such time by means of a “cashless
exercise” in which the Holder shall be entitled to receive a number of Warrant Shares equal to the quotient obtained by
dividing [(A-B) (X)] by (A), where:

 

	 	(A) =	 the VWAP (as defined in the Purchase Agreement) on
the Trading 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.

 

Notwithstanding
anything herein to the contrary, on the Termination Date, unless the Holder notifies the Company otherwise, if there is no effective
Registration Statement registering the Warrant Shares, or no current prospectus available for the resale of the Warrant Shares
by the Holder, then this Warrant shall be automatically exercised on the last Trading Day on which this Warrant may be exercised
via cashless exercise pursuant to this Section 2(c).

 

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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 permitting the issuance of the Warrant Shares to or resale of the Warrant
Shares by the Holder or (B) this Warrant is being exercised via cashless exercise and Rule 144 is available, and otherwise by
physical delivery to the address specified by the Holder in the Notice of Exercise by the date that is two (2) Trading Days after
the latest of (A) the delivery to the Company of the Notice of Exercise, (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”). 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 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. The Company
understands that a delay in the delivery of the Warrant Shares after the Warrant Share Delivery Date could result in economic
loss to the Holder. As compensation to the Holder for such loss, the Company agrees to pay (as liquidated damages and not as a
penalty) to the Holder for late issuance of Warrant Shares upon exercise of this Warrant the proportionate amount of $10 per Trading
Day (increasing to $20 per Trading Day after the fifth (5th) Trading Day) commencing three (3) Trading Days after the
Warrant Share Delivery Date for each $1,000 of Exercise Price of Warrant Shares for which this Warrant is exercised which are
not timely delivered. The Company shall pay any payments incurred under this Section in immediately available funds upon demand

 

(ii)
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
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)
Revocation of Exercise. In addition to any other remedies which may be available to the Holder, in the event that the Company
fails for any reason to effect delivery of the Warrant Shares by the Warrant Share Delivery Date, the Holder may revoke all or
part of the relevant Warrant exercise by delivery of a notice to such effect to the Company, whereupon the Company and the Holder
shall each be restored to their respective positions immediately prior to the exercise of the relevant portion of this Warrant,
except that the liquidated damages described above shall be payable through the date notice of revocation or rescission is given
to the Company.

 

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(iv)
Compensation for Buy-In on Failure to Timely Deliver Certificates Upon Exercise. In addition to any other rights available
to the Holder, 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 (other than any such failure that is solely
due to any unreasonable action or inaction by the Holder with respect to such exercise), and if after such date the Holder is
required by its broker to purchase (in an open market transaction or otherwise) or the Holder’s brokerage firm otherwise
purchases, Common Shares to deliver in satisfaction of a sale by the Holder of the Warrant Shares which the Holder anticipated
receiving upon such exercise (a “Buy-In”), then the Company shall (A) pay in cash to the Holder the amount,
if any, by which (x) the Holder’s total purchase price (including brokerage commissions, if any) for the Common Shares so
purchased exceeds (y) the amount obtained by multiplying (1) the number of Warrant Shares that the Company was required to deliver
to the Holder in connection with the exercise at issue times (2) the price at which the sell order giving rise to such purchase
obligation was executed, and (B) at the option of the Holder, either reinstate the portion of the Warrant and equivalent number
of Warrant Shares for which such exercise was not honored (in which case such exercise shall be deemed rescinded) or deliver to
the Holder the number of Common Shares that would have been issued had the Company timely complied with its exercise and delivery
obligations hereunder. For example, if the Holder purchases Common Shares having a total purchase price of $11,000 to cover a
Buy-In with respect to an attempted exercise of Common Shares with an aggregate sale price giving rise to such purchase obligation
of $10,000, under clause (A) of the immediately preceding sentence the Company shall be required to pay the Holder $1,000. The
Holder shall provide the Company written notice indicating the amounts payable to the Holder in respect of the Buy-In and, upon
request of the Company, evidence of the amount of such loss. 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 certificates representing Common Shares upon exercise
of the Warrant as required 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 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. The Company shall pay all Transfer Agent fees required for same-day processing
of any Notice of Exercise.

 

(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.

 

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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 Shares or any other equity or equity equivalent securities
payable in Common Shares (which, for avoidance of doubt, shall not include any Common Shares issued by the Company upon exercise
of this Warrant or pursuant to any of the other Transaction Documents), (ii) subdivides outstanding Common Shares into a larger
number of shares, (iii) combines (including by way of reverse stock split) outstanding Common Shares into a smaller number of
shares, or (iv) issues by reclassification of shares of the Common Shares 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 Common Shares (excluding
treasury shares, if any) outstanding immediately before such event and of which the denominator shall be the number of Common
Shares 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)
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 Shares Equivalents or rights to purchase stock, warrants, securities or other property pro
rata to the record holders of any class of Common Shares (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 Common Shares 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 Common Shares 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 Common Shares 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).

 

(c)
Pro Rata Distributions. If the Company, at any time while this Warrant is outstanding, shall distribute to all holders
of Common Shares (and not to the Holder) evidences of its indebtedness or assets (including cash and cash dividends) or rights
or warrants to subscribe for or purchase any security other than the Common Shares (which shall be subject to 3(c)), then in each
such case the Exercise Price shall be adjusted by multiplying the Exercise Price in effect immediately prior to the record date
fixed for determination of stockholders entitled to receive such distribution by a fraction of which the denominator shall be
the VWAP determined as of the record date mentioned above, and of which the numerator shall be such VWAP on such record date less
the then per share fair market value at such record date of the portion of such assets or evidence of indebtedness so distributed
applicable to one outstanding share of the Common Shares as determined by the Board of Directors in good faith. In either case
the adjustments shall be described in a statement provided to the Holder of the portion of assets or evidences of indebtedness
so distributed or such subscription rights applicable to one Common Share. Such adjustment shall be made whenever any such distribution
is made and shall become effective immediately after the record date mentioned above.

 

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(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 Shares 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 Shares, (iv) the Company, directly or indirectly, in one or more related transactions effects any reclassification,
reorganization or recapitalization of the Common Shares or any compulsory share exchange pursuant to which the Common Shares are
effectively converted into or exchanged for other securities, cash or property, 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 or group of Persons whereby
such other Person or group acquires more than 50% of the outstanding Common Shares (not including any Common Shares 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,
the number of Common Shares (or successor security) 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 Common Shares for which this Warrant is exercisable immediately prior
to such 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 Common
Share 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
Shares 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. Notwithstanding anything to the contrary, in the event of a Fundamental Transaction, the Company or any
Successor Entity (as defined below) shall, at the Holder’s option, exercisable at any time concurrently with, or within
30 days after, the consummation of the Fundamental Transaction, purchase this Warrant from the Holder by paying to the Holder
an amount of cash equal to the Black Scholes Value of the remaining unexercised portion of this Warrant on the date of the consummation
of such Fundamental Transaction. “Black Scholes Value” means the value of this Warrant based on the Black and
Scholes Option Pricing Model obtained from the “OV” function on Bloomberg, L.P. (“Bloomberg”) determined
as of the day of consummation of the applicable Fundamental Transaction for pricing purposes and reflecting (A) a risk-free interest
rate corresponding to the U.S. Treasury rate for a period equal to the time between the date of the public announcement of the
applicable Fundamental Transaction and the Termination Date, (B) an expected volatility equal to the greater of 100% and the 100
day volatility obtained from the HVT function on Bloomberg as of the Trading Day immediately following the public announcement
of the applicable Fundamental Transaction, (C) the underlying price per share used in such calculation shall be the sum of the
price per share being offered in cash, if any, plus the value of any non-cash consideration, if any, being offered in such Fundamental
Transaction and (D) a remaining option time equal to the time between the date of the public announcement of the applicable Fundamental
Transaction and the Termination Date. 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 and the other Transaction Documents in accordance with the provisions of this Section 3(d) 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 Common Shares 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 Common Shares 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 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 and the other Transaction Documents 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 and the other Transaction Documents with the same effect as if such Successor Entity had been named as the Company herein.

 

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(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 Common Shares deemed to be issued and outstanding
as of a given date shall be the sum of the number of Common Shares (excluding treasury shares, if any) issued and outstanding.

 

(f)
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 give notice to the Holder setting forth the Exercise Price after such adjustment and any resulting
adjustment to the number of Warrant Shares and setting forth a statement of the facts requiring such adjustment (“Dilutive
Issuance Notice”). For purposes of clarification, whether or not the Company provides a Dilutive Issuance Notice pursuant
to this Section 3, upon the occurrence of any Dilutive or other reduction of the Exercise Price, the Holder is entitled to receive
a number of Warrant Shares based upon the reduced Exercise Price regardless of whether the Holder accurately refers to the Exercise
Price in the Notice of Exercise.

 

(ii)
Notice to Allow Exercise by Holder. If (A) the Company shall declare a dividend (or any other distribution in whatever
form) on the Common Shares, (B) the Company shall declare a special nonrecurring cash dividend on or a redemption of the Common
Shares, (C) the Company shall authorize the granting to all holders of the Common Shares 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 Shares, 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 Shares are converted into other securities, 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, to the extent that such information constitutes material
non-public information (as determined in good faith by the Company) the Company shall follow the procedure described in Section
13 of the Subscription Agreement and shall deliver to the Holder at its last address as it shall appear upon the Warrant Register
of the Company, at least 20 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 Shares 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 Shares of record shall be entitled to exchange their shares of the Common Shares 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.

 

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(g)
Increase in Warrant Shares. In the event the Exercise Price is reduced for any reason, including but not limited to pursuant
to Section 3(e) of this Warrant, the number of Warrant Shares issuable hereunder shall be increased such that the aggregate Exercise
Price payable hereunder, after taking into account the decrease in the Exercise Price, shall be equal to the aggregate Exercise
Price prior to such adjustment.

 

Section
4. Transfer of Warrant.

 

(a)
Transferability. Subject to compliance with any applicable securities laws and the provisions of the Purchase Agreement,
this Warrant and all rights hereunder (including, without limitation, any registration rights) 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
be dated the initial issuance date of this Warrant and shall be identical with this Warrant except as to the number of Warrant
Shares issuable pursuant thereto.

 

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(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 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)
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 (which, in the case
of the Warrant, 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.

 

(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 Trading Day, then, such action may be taken or such right may be exercised on the next
succeeding Trading Day.

 

(d)
Authorized Shares. Subsequent to the Company obtaining Shareholder approval to increase its authorized shares of Common
Stock, the Company covenants that, during the period the Warrant is outstanding, it will reserve from its authorized and unissued
Common Shares 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 Shares may be listed. 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 non-assessable 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). 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, but will at all times in good faith assist in the carrying out of all such terms and in the taking of all such actions
as may be necessary or appropriate to protect the rights of Holder as set forth in this Warrant against impairment. 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.

 

    	 	9	 

    	 	 	 

    

 

(e)
Jurisdiction. All questions concerning governing law, jurisdiction, venue and the construction, validity, enforcement and
interpretation of this Warrant shall be determined in accordance with the provisions of the Purchase Agreement.

 

(f)
Restrictions. The Holder acknowledges that the Warrant Shares acquired upon the exercise of this Warrant, if not registered,
or unless exercised in a cashless exercise when Rule 144 is available, and the Holder does not utilize cashless exercise, will
have restrictions upon resale imposed by state and federal securities laws.

 

(g)
Non-waiver 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 the Holder’s rights, powers or remedies. Without limiting
any other provision of this Warrant or the Purchase Agreement, if the Company willfully and knowingly fails to comply with any
provision of this Warrant, which results in any material damages to the Holder, the Company shall pay to the Holder 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 the Holder in collecting any amounts due pursuant hereto or in otherwise enforcing
any of its rights, powers or remedies hereunder.

 

(h)
Notices. All notices, demands, requests, consents, approvals, and other communications required or permitted hereunder
shall be in writing and, unless otherwise specified herein, shall be (i) personally served, (ii) deposited in the mail, registered
or certified, return receipt requested, postage prepaid, (iii) delivered by reputable air courier service with charges prepaid,
or (iv) transmitted by hand delivery, telegram, facsimile, or electronic mail, addressed as set forth below or to such other address
as such party shall have specified most recently by written notice. Any notice or other communication required or permitted to
be given hereunder shall be deemed effective (a) upon hand delivery or delivery by facsimile, with accurate confirmation generated
by the transmitting facsimile machine, at the address or number designated below (if delivered on a business day during normal
business hours where such notice is to be received), or the first business day following such delivery (if delivered other than
on a business day during normal business hours where such notice is to be received), or (b) upon receipt, when sent by electronic
mail (provided confirmation of transmission is electronically generated and keep on file by the sending party), or (c) on the
second business day following the date of mailing by express courier service, fully prepaid, addressed to such address, or upon
actual receipt of such mailing, whichever shall first occur. The addresses for such communications shall be: (i) if to the Company,
to: Sigma Labs, Inc., 3900 Paseo del Sol, Santa Fe, New Mexico 87507, Attn: John Rice, President and CEO, e-mail: rice@sigmalabsinc.com,
with a copy by electronic mail only to: TroyGould PC, 1801 Century Park East, Suite 1600, Los Angeles, CA 90067-2367, Attn: Darren
Freedman, Esq., e-mail: dfreedman@troygould.com (which shall not constitute notice), and (ii) if to the Holder, to: the address
and fax number indicated on the front page of this Warrant, with an additional copy by electronic mail only to (which shall not
constitute notice): Grushko & Mittman, P.C., 515 Rockaway Avenue, Valley Stream, New York 11581, Attn: Edward M. Grushko,
Esq., e-mail: ed@grushkomittman.com.

 

    	 	10	 

    	 	 	 

    

 

(i)
Limitation of Liability. No provision hereof, in the absence of any affirmative action by the Holder to exercise this Warrant
to purchase Warrant Shares, and no enumeration herein of the rights or privileges of the Holder, shall give rise to any liability
of the Holder for the purchase price of any Common Shares 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, 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. The Company agrees that monetary damages would not
be adequate compensation for any loss incurred by reason of a breach by it of the provisions of this Warrant and hereby agrees
to waive and not to assert the defense in any action for specific performance that a remedy at law would be adequate.

 

(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 may be modified or amended or the provisions hereof waived with the written consent of the Company
and the Holders of not less than a majority of the outstanding Warrants issued pursuant to the Purchase Agreement.

 

(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)

 

    	 	11	 

    	 	 	 

    

 

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.

 

	 	SIGMA
    LABS, INC.
	 	 	 
	 	By:	 
	 	Name:	John
    Rice
	 	Title:	President
    and CEO

 

    	 	12	 

    	 	 	 

    

 

NOTICE
OF EXERCISE

 

To:
SIGMA LABS, 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.

 

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

 

[  ]
in lawful money of the United States;

 

[  ]
[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:

 

_______________________________

 

(4)
After giving effect to this Notice of Exercise, the undersigned will not have exceeded the Beneficial Ownership Limitation.

 

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.)

 

SIGMA
LABS, INC.

 

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.Exhibit

Exhibit 4.1

DESCRIPTION OF CAPITAL STOCK

General

The following description summarizes the most important terms of our Restated Certificate of Incorporation, as amended (“Certificate of Incorporation”), relating to the rights of holders of our capital stock. Because it is only a summary, it does not contain all the information that may be important to you. For a complete description of the matters set forth in this “Description of Capital Stock,” you should refer to our Certificate of Incorporation and By-Laws, as amended (“By-Laws”), which are included as exhibits to our Annual Report on Form 10-K, and to the applicable provisions of Delaware law. Our authorized capital stock consists of 400,000,000 shares of Class A common stock, $0.10 par value, 90,000,000 shares of Class B common stock, $0.10 par value, 100,000,000 shares of participating preferred stock, $0.10 par value, and 500,000 shares of preferred stock, $10.00 par value. As of December 31, 2019, 278,120,159 shares of our Class A common stock and 37,738,354  shares of our Class B common stock were outstanding. We had no outstanding participating preferred stock or preferred stock.  Our Class A common stock is listed on the New York Stock Exchange under the symbol “LEN” and our Class B common stock is listed on the New York Stock Exchange under the symbol “LEN.B”.

Description of Common Stock

We have two classes of common stock: Class A common stock and Class B common stock.  The two classes are identical in every respect, except as to voting rights and, to a limited extent, in connection with distributions by us of our stock other than preferred stock.

Rights Relating to Dividends and Distributions

Subject to preferences that may apply to any shares of preferred stock and participating preferred stock that are outstanding at the time, the holders of shares of Class A common stock and Class B common stock are entitled to share equally, on a per share basis, in any dividends or distributions that our Board of Directors may declare.  Each dividend or distribution will be payable to the holders of our Class A common stock and Class B common stock without regard to class, except that in the case of dividends or distributions payable in our stock other than preferred stock, our Board of Directors may determine that the holders of Class A common stock will receive additional shares of Class A common stock, and the holders of Class B common stock will receive additional shares of Class B common stock.

Voting Rights

Each share of Class A common stock entitles the holder to one vote on each matter, and each share of Class B common stock entitles the holder to ten votes on each matter submitted to the vote of the common stockholders. With respect to matters on which stockholders are entitled to vote, holders of shares of Class A common stock and Class B common stock vote together as a single class; provided, however, that amendments to provisions of our Certificate of Incorporation relating to the Class A common stock or the Class B common stock require the approval of a majority of the shares of Class A common stock which are voted with regard to them, as well as approval of a majority in voting power of all the outstanding Class A common stock and Class B common stock combined.  Also, under the Delaware General Corporation Law (“DGCL”), certain matters affecting the rights of holders of only Class A or Class B common stock may require approval of the holders of the Class A or Class B common stock voting as a separate class. The holders of our common stock do not have cumulative voting rights.

Liquidation Rights

We currently have no outstanding preferred stock or participating preferred stock.  While that continues to be the case, if we are liquidated, the holders of our Class A and Class B common stock will be entitled to share equally on a per share basis, without regard to class, in the assets available for distribution after we have satisfied our debts and liabilities.  

If we are liquidated at a time when there are outstanding shares of preferred stock, but not of participating preferred stock, the holders of our Class A and Class B common stock will be entitled to share equally on a per share basis, without regard to class, in the assets available for distribution after we have satisfied our debts and liabilities and made any distributions we are required to make with regard to the preferred stock.  

If we are liquidated at a time when there are outstanding shares of participating preferred stock, the right of holders of Class A and Class B common stock to receive liquidating dividends will be limited as described under “Description of Participating Preferred Stock.” 

Termination of Class Rights and Powers

If at any time (i) the number of outstanding shares of our Class B common stock is less than 10% of the number of outstanding shares of Class A common stock and Class B common stock taken together, or (ii) the holders of a majority of the outstanding shares of Class B common stock vote to cause all the Class B common stock to be converted into Class A common stock, the Class B common stock will automatically be converted into, and become for all purposes, shares of Class A common stock, and we will no longer be authorized to issue Class B common stock.

Other Rights or Restrictions

Under our Certificate of Incorporation and By-Laws as they currently exist, our common stock is not subject to provisions relating to conversion, sinking funds, redemption, preemption rights, liability to further calls or to assessment, restrictions on alienability or discrimination against any existing or prospective holder as a result of that holder’s owning a substantial amount of our securities.  However, our Board of Directors could, without vote of our stockholders, amend our By-Laws or take other action at any time, subject to limitations imposed by Delaware law, to create restrictions on who could own our common stock or that would discriminate against existing or prospective stockholders who own or propose to acquire more than specified percentages of our outstanding common stock.

Description of Preferred Stock

We may issue preferred stock in series with any rights and preferences that may be authorized by our Board of Directors. These rights and preferences might include some or all of:

		
	•
	Preferential rights to dividends, which might be fixed or participating, and might or might not be cumulative;

		
	•
	Special voting rights, including rights to elect directors without the vote of other classes of stock;

		
	•
	Rights to convert the preferred stock into shares of common stock or other securities;

		
	•
	Rights to require us to redeem shares or provisions giving us the right to redeem shares;

		
	•
	Rights to benefit from sinking funds;

		
	•
	Preferential rights to distributions on liquidation;

		
	•
	Preemptive rights;

		
	•
	Other special rights or preferences.

Description of Participating Preferred Stock

If we issue participating preferred stock, it will be identical with the Class A common stock in every way, except that (a) no cash dividends may be paid with regard to the Class A and Class B common stock in a calendar year until the holders of the participating preferred stock have received a total of $.0125 per share, then no cash dividends may be paid in that year with regard to the participating preferred stock until the holders of the Class A and Class B common stock have received dividends totaling $.0125 per share, and then any additional dividends in the year will be paid on an equal per share basis to the holders of the participating preferred stock and of the Class A and Class B common stock, (b) if we are liquidated, none of our assets may be distributed to the holders of the Class A and Class B common stock until the holders of the participating preferred stock have received distributions totaling $10 per share, then no assets may be distributed to the holders of the participating preferred stock until the holders of the Class A and Class B common stock have received distributions totaling $10 per share, and then any further liquidating distributions will be made on an equal per share basis to the holders of the participating preferred stock and of the Class A and Class B common stock, and (c) holders of participating preferred stock will vote separately on any proposed corporate actions which would change the participating preferred stock or would cause the holders of the participating preferred stock to receive per share consideration in a merger or similar transaction which is different from the per share consideration received by the holders of the Class A and Class B common stock.

Anti-Takeover Effects of our Certificate of Incorporation and By-Laws

Our Certificate of Incorporation and By-Laws have provisions that could have the effect of making it more difficult for somebody who wanted to take control of us to do so.  They include:

Multi-Voting Stock.  Holders of Class B common stock have substantial voting power because they have the ability to cast ten votes per share. 

Advance Notice Requirements. A requirement that stockholders give advance notice of their intention to nominate candidates for election as directors or to bring other business before a meeting of stockholders. 

Limit on Stockholder Ability to Nominate Candidates for Election as Directors.  In order to be able to nominate a candidate for election or re-election to our Board of Directors, a person must own and have owned for at least one year of record and beneficially at least $2,000 in market value or 1% of our outstanding common stock of both classes combined.

Limit on Stockholder Ability to Request Record Date for Action by Stockholder Consent.  In order to be able to request that our Board of Directors fix a record date for the taking of action by written consent, a person must own and have owned for at least one year of record and beneficially at least $2,000 in market value or 1% of our outstanding common stock of both classes combined.

Requirement for Calling of Special Meetings of Stockholders. Special meetings of our stockholders may be called by stockholders only upon the written request of the holders of at least a majority of all the outstanding shares of any class entitled to vote on the action proposed to be taken. 

Undesignated Preferred Stock. Our Board of Directors is authorized to cause us to issue, without a stockholder vote, preferred stock, which could entitle holders to voting or other rights or preferences that could impede the success of any attempt to acquire us.

Board Authority to Amend By-Laws. Our Board of Directors has the authority to adopt, amend or repeal our By-Laws without the approval of our stockholders.

Delaware Anti-Takeover Statute

We are subject to Section 203 of the DGCL, which, subject to limited exceptions, prohibits a publicly-held Delaware corporation from engaging in a business combination with an entity controlled by a person who, together with the person’s affiliates and associates, acquires without the prior approval of the corporation’s board of directors more than 15%, but less than 85%, of the corporation’s voting securities (excluding for purposes of calculating the 85% shares owned by officers, directors or certain employee stock plans) until three years after the person, together with the person’s affiliates and associates, became the owner of more than 15% of the corporation’s voting securities, unless the business combination is approved by the affirmative vote of holders of more than 66 2/3% of the outstanding voting stock that is not owned by the person who acquired more than 15%  of the corporation’s voting securities or that person’s affiliates or associates.

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