Document:

EXHIBIT 10.57  

TECHNOLOGY
CONTRIBUTION & ASSIGNMENT AGREEMENT

 

Explanatory
Note

 

Within this Exhibit 10.57 certain
identified information, indicated with brackets, has been excluded from the exhibit as it is believed by the Company to be both
(i) not material and (ii) would likely cause competitive harm if publicly disclosed.

 

This Technology
Contribution & Assignment Agreement (this “Agreement”) is made this 6th day of February, 2018
by and between Matthew R. Piazza, an individual residing at 4300 N. Ocean Blvd., Apt. 6, Delray Beach, Florida 33483 (“Piazza”)
and Advanced Nanofibers, LLC, a Florida limited liability company with its principal place of business located at 1313 South Killian
Drive, Lake Park, FL 33403 (“Advanced”) (Piazza and Advanced may hereinafter be referred to, individually, as
a “Party,” or, jointly, as the “Parties”).

 

WHEREAS, as of the
date hereof, Piazza, through a personal ownership stake in an entity known as Nanotech Fibers LLC, owns and controls a substantial
equity interest in Advanced, and has owned a substantial equity interest in Advanced since its founding in August, 2016;

 

WHEREAS, Piazza
has developed certain materials formulae potentially valuable to Advanced as it is or may be manifest in existing and/or potential
intellectual property;

 

WHEREAS, Advanced
seeks to exploit to the fullest industrial and commercial potential the product market opportunities afforded by the materials
formulae developed by Piazza, both on their own and when combined with other, related technologies, adaptations, and/or materials,
and Advanced has already invested significantly in the development of such exploitation;

 

WHEREAS, in exchange
for certain economic benefits, Piazza desires to contribute and assign to Advanced all of his rights, title and interest in and
to the aforementioned materials formulae, and Advanced desires to acquire such rights, title and interest;

 

NOW, THEREFORE,
for and in consideration of the mutual covenants and agreements set forth herein, the Parties hereby agree as follows:

 

1.       Contribution
and Assignment. In consideration of (i) all product development expenditures made by Advanced to date towards the commercialization
of the intellectual property described in Schedule A annexed hereto and made a part hereof (the “Subject Chemistry
& Composition IP”), which, as of the date hereof it is stipulated and acknowledged by Piazza to have totaled more
than [two hundred and fifty thousand dollars ($250,000)], together with (ii) a good faith, present commitment on the part of Advanced
to continue to invest in such commercialization, including the bringing of the products embodying or potentially embodying the
Subject Chemistry & Composition IP, all as specifically identified in Schedule B annexed hereto and made a part hereof,
as it may be amended from time to time (collectively, the “Subject Products”) to market, the packaging and selling
off to one or more third parties the rights of Advanced to one or more of the Subject Products as determined by Advanced, and/or
to otherwise exploit such Subject Chemistry & Composition IP for profit, and to bear all of the costs associated with the establishment
and maintenance of the intellectual property associated therewith and/or potentially associated therewith, including without limitation
the filing and pursuit of patent applications and related intellectual property protections, and (iii) an agreement to pay to Piazza
a percentage, based on the gross profit margins of the Subject Products manufactured and sold by or for the account of Advanced,
and actually realized by Advanced and not at any time recouped for any reason whatsoever, as specifically set forth on Schedule
C annexed hereto and made a part hereof, of all annually distributable income of Advanced from and after the date hereof (the
“IP Royalty”), Piazza hereby irrevocably commits, contributes, conveys and assigns to Advanced all of his rights,
title and interest in and to the Subject Chemistry & Composition IP.

 

2.       Representations
and Warranties of Piazza. Piazza hereby represents and warrants as follows, which representations and warranties shall be deemed
repeated at all times throughout the Term:

 

(a)       Piazza
is an individual, with full power and authority to execute and deliver this Agreement and to consummate the arrangement, understanding
and transactions contemplated hereby.

 

(b)       This
Agreement is a valid and legally binding obligation of Piazza, and is enforceable against Piazza in accordance with its terms,
except as such enforceability may be limited by bankruptcy, insolvency, reorganization, moratorium or similar laws affecting creditors’
rights generally, and by general principles of equity (regardless of whether enforcement is sought in a proceeding at law or in
equity).

 

(c)       The
execution, delivery and performance of this Agreement by Piazza and the consummation of the transactions contemplated hereby do
not and will not (i) result in a violation of any statute, rule, regulation, ordinance, order, judgment, decree, rule or regulation
of any court or any governmental agency or body applicable to Piazza, (ii) violate or result in a material breach of or constitute
an event of default (or an event which might, upon the passage of time or the giving of notice, or both, constitute an event of
default) under any provision of any agreement or instrument to which Piazza or any of his assets are subject, or (iii) result in
acceleration or cancellation of any obligation under, or give rise to a right by Piazza to terminate or amend his obligations under,
any mortgage, deed of trust, conveyance to secure debt, note, loan, indenture, lien, contract or governmental certification, license
or permit (other than any governmental permits for which transfer is not permitted by law or the issuing authority), instrument,
order, judgment or decree or other material arrangement or commitment to which Piazza or any of his assets are subject.

 

(d)       No
consent, approval, order or authorization of, or registration, declaration or filing with, any other party or any federal, state
or local government agency or entity is required by Piazza in connection with the execution and delivery of this Agreement or the
consummation of the transactions contemplated hereby or the performance by Piazza of its obligations under this Agreement.

 

(e)       Piazza
possesses all rights, title and interest in and to the Subject Chemistry & Composition IP, and all rights, free of any conflict
or third party claims, or reasonably alleged conflict or third party claims, to convey the Subject Chemistry & Composition
IP as contemplated by this Agreement, including without limitation any potential conflicts or claims of infringement (i) on the
part of CarpenterCrete LLC or any affiliates (including without limitation CarpenterStone), principals, or assignees thereof or
successors-in-interest thereto, and/or (ii) arising out of any alleged infringement of U.S. Patent Publication Number US8382893B1
(Application Filing Date: 2012-03-09) or U.S. Patent Publication Number US7147706B1 (Application Filing Date: 2002-08-29).

 

(f)       The
intellectual property reflected by the Subject Chemistry & Composition IP does not infringe in any way on any patents in relation
to which Piazza is identified as a contributing inventor, including without limitation U.S. Patent Publication Number US8382893B1
(Application Filing Date: 2012-03-09) and U.S. Patent Publication Number US7147706B1 (Application Filing Date: 2002-08-29).

 

3.       Representations
and Warranties of Advanced. Advanced hereby represents and warrants as follows, which representations and warranties shall
be deemed repeated at all times throughout the Term:

 

(a)       Advanced
is a limited liability company duly organized, validly existing and in good standing under the laws of the State of Florida, and
has full power and authority to execute and deliver this Agreement and to consummate the arrangement, understanding and transactions
contemplated hereby, and has duly authorized the execution, delivery and performance of this Agreement by all necessary company
action.

 

(b)       This
Agreement is a valid and legally binding obligation of Advanced, and is enforceable against Advanced in accordance with its terms,
except as such enforceability may be limited by bankruptcy, insolvency, reorganization, moratorium or similar laws affecting creditors’
rights generally, and by general principles of equity (regardless of whether enforcement is sought in a proceeding at law or in
equity).

 

(c)       The
execution, delivery and performance of this Agreement by Advanced and the consummation of the transactions contemplated hereby
do not and will not (i) result in a breach or violation of any provision of any of Advanced’s organizational documents (i.e.,
certificate of formation and operating agreement, in each case as amended to date) or in a violation of any statute, rule, regulation,
ordinance, order, judgment, decree, rule or regulation of any court or any governmental agency or body applicable to Advanced,
(ii) violate or result in a material breach of or constitute an event of default (or an event which might, upon the passage of
time or the giving of notice, or both, constitute an event of default) under any provision of, result in acceleration or cancellation
of any obligation under, or give rise to a right by Advanced to terminate or amend its obligations under, any mortgage, deed of
trust, conveyance to secure debt, note, loan, indenture, lien, contract or governmental certification, license or permit (other
than any governmental permits for which transfer is not permitted by law or the issuing authority), instrument, order, judgment
or decree or other material arrangement or commitment to which Advanced is subject.

 

(d)       No
consent, approval, order or authorization of, or registration, declaration or filing with, any other party or any federal, state
or local government agency or entity is required by Advanced in connection with the execution and delivery of this Agreement or
the consummation of the transactions contemplated hereby or the performance by Advanced of its obligations under this Agreement.

 

4.       Covenants
of Piazza. In addition to all of Piazza’s other obligations set forth in this Agreement:

 

(a)       From
and after the date hereof, and for so long as he holds a beneficial ownership interest in Advanced, Piazza covenants that he shall
promptly execute such documents and other instruments, and take such further actions, as may be reasonably requested by Advanced
from time to time to carry out the intentions and provisions of this Agreement.

 

(b)       From
and after the date hereof, and for so long as he holds a beneficial ownership interest in Advanced, Piazza covenants that he shall
promptly notify Advanced, and divulge, disclose and surrender to Advanced, in each case in writing, any and all ideas that occur
to him and that might reasonably be construed as falling within the definition of Subject Chemistry & Composition IP set forth
in Schedule A to this Agreement, and, as appropriate, inform Advanced as part of such notification that any such ideas be added
to the list of Subject Products set forth in Schedule B to this Agreement.

 

(c)       From
and after the date hereof, and for so long as he holds a beneficial ownership interest in Advanced plus an additional period of
five (5) years thereafter, Piazza covenants that he shall refrain from engaging or assisting in any business, or acquiring any
equity interest in any business that would constitute anything other than a strictly passive investment in a public company, in
either case that is directly or indirectly competitive with Advanced or any of the Advanced Products.

 

(d)       From
and after the date hereof, and for an indefinite period, Piazza shall indemnify and hold harmless
Advanced and Findex.com, Inc., and each of their respective managers, officers, directors, principals, affiliates, agents and attorneys
against any and all losses, claims, demands, liabilities and expenses (including reasonable legal or other expenses as such are
incurred) incurred by each such entity or person in connection with the defending or investigating of any losses, claims demands,
liabilities, penalties, or associated expenses, whether or not resulting in any liability to such entity or person, to which any
such indemnified party may become subject insofar as any such losses, claims, demands, liabilities, penalties and/or associated
expenses (a) arise out of or are based upon any untrue statement or not unreasonably alleged untrue statement of Piazza of a material
fact contained in this Agreement, or (b) arise out of or are based upon any breach of any representation, warranty or agreement
of Piazza contained herein.

 

5.       Miscellaneous.

 

5.1       Notices.
All notices and other communications hereunder shall be in writing, addressed to the other Party at the address provided in the
preamble to this Agreement or such other address as shall have been provided in writing to the notifying Party by the recipient
Party following the date hereof, and shall be deemed to have been duly given (i) three (3) business days after mailing if mailed
by certified or registered mail, return receipt requested; (ii) one business day after delivery by Federal Express or UPS, if sent
for overnight delivery with fees prepaid; (iii) upon receipt if sent via email; or (iv) upon receipt if delivered personally.

 

5.2       Assignment.

 

5.2.1       Neither
this Agreement nor any of the rights, interests or obligations hereunder shall be transferred, assigned, conveyed or delegated
by either Party, in whole or in part, without the prior, written consent of the other Party, and any attempt to make any such transfer,
assignment or delegation without such consent shall be null and void; provided, however, that (i) Advanced shall have and
maintain the right at all times hereunder to transfer, assign, convey, and/or delegate any or all of its rights, interests and/or
obligations hereunder without obtaining the consent of Piazza where such transfer, assignment, and/or delegation shall occur in
connection with any sale of Advanced, whether through merger or otherwise, or all or substantially all of its assets, and (ii)
this Agreement shall be binding upon and inure to the benefit of and be enforceable by the successors, legal representatives and
permitted assigns of Advanced.

 

5.2.2       The
rights in and to the Subject Chemistry & Composition IP assigned and conveyed by this Agreement to Advanced shall be freely
licensable, re-assignable and/or conveyable to any third parties by Advanced at any time from and after the date hereof, in whole
or in part, without the consent of Piazza, and Piazza shall be required to promptly take any and all reasonable steps requested
by Advanced to carry out any such contemplated license, re-assignment, and/or conveyance.

 

5.3       Modification
and Waiver. No modification, amendment or waiver of any provision of this Agreement shall be valid or binding unless in writing
and executed by both of the Parties. Any other purported modification, amendment or waiver of any provision of this Agreement shall
be null and void for all purposes. No waiver by any Party of any breach, or the failure of any Party to enforce any of the terms
and conditions of this Agreement, shall affect, limit or waive that Party’s right to enforce and compel compliance with all
terms and conditions of this Agreement, or to terminate this Agreement in accordance with its terms.

 

5.4       Invalidity
or Illegality. In the event any provision of this Agreement shall be declared to be void, invalid or unlawful by any court
or tribunal of competent jurisdiction, such provision shall be deemed severed from the remainder of this Agreement and the balance
shall remain in full force and effect. The Parties shall undertake to replace the invalid, ineffective, or unenforceable provisions
with valid, effective, and enforceable provisions, which, in their commercial effect, approximate as closely as possible the intentions
of the Parties as expressed in the then-declared invalid, ineffective, or unenforceable provision.

 

5.5       Governing
Law; Forum Selection. This Agreement shall be governed by and construed in accordance with the laws of the State of Florida,
without regard to the conflict of laws principles thereof. Any dispute between the Parties surrounding the interpretation or meaning
of any provision of this Agreement, or any of the benefits, duties or obligations of the Parties arising under this Agreement,
shall be brought and litigated in the State of Florida, and, to the extent jurisdiction exists, the superior courts of Palm Beach
County, Florida, and the Parties acknowledge and agree that this Agreement has been made and entered into in such county, and both
Parties waive any argument that either of them may have that such forum in or will be inconvenient.

 

5.6       Entire
Agreement; Waiver. This Agreement, including both the Subject Chemistry & Composition IP schedule annexed hereto as Schedule
A and referenced in Section 1 of this Agreement and the Subject Products schedule annexed hereto as Schedule B and referenced in
Section 1 of this Agreement, constitutes the entire and complete agreement and understanding between the Parties relating to the
subject matter of this Agreement and supersedes any prior negotiations, understandings, or agreements, whether written or oral,
relating to the subject matter of this Agreement. No amendment to or waiver of any provision of this Agreement shall be effective
unless it is reduced to writing and signed by both Parties, no waiver of any provision of this Agreement shall be deemed to arise
from any inaction by a Party or any course of dealing between the Parties, and any waiver of any otherwise enforceable provision
of this Agreement shall relate strictly to the particular instance to which such waiver applies, even if recurring.

 

IN WITNESS WHEREOF, each
of the Parties hereto has caused this Agreement to be duly executed on its behalf by its duly authorized officer, all as of the
day and year first written above.

 

 

 

________________________________

Matthew R. Piazza

 

 

ADVANCED NANOFIBERS, LLC

 

 

 

By: _____________________________

Printed Name: James S. Bond

Title: Manager For Financial Affairs

 

 

 

Schedule A

 

 

“Subject Chemistry & Composition IP”

 

Whatever
intellectual property currently and rightfully exists in the name of Piazza or any one or more of his designee(s) and/or
assigns, or to which Piazza has any enforceable or defensible legal rights or claims, and whatever intellectual property may
hereinafter come to exist from this day forward in the name of Piazza or any one or more of his designee(s) and/or assigns,
or to which Piazza may from this day forward come to have any enforceable legal rights or claims, in each case relative to
the production of additive-based formulae for cement or the production of concrete or stucco/mortar, including without
limitation liquid and/or dry so-called “admixtures” (or “admixes,” as they are commonly referred to)
for concrete or stucco/mortar, which substances have the effect of transforming the concrete or stucco/mortar end-product,
once mixed and cured, into a relatively high-performance or otherwise higher quality end-product which is either materially
denser, stronger, more resistant to degradation, durable or impenetrable, and/or lighter than comparable end-product
available in the market (on a per-unit basis), and/or otherwise more effective for any purposes that such materials might
conceivably be used, and/or that enables it to cure faster than comparable end-product available in the market (on a per-unit
basis), and which formulae (A) may or may not include, as packaged in product form, a combination of both one or more liquid
components and one or more semi-liquid, viscous and/or dry components, (B) may or may not include, as constituent components,
one or more commercially available concrete admixtures, [*] or another substitute therefore, polymer-based fibers (whether
polypropylene, polyethylene, polyvinyl alcohol, or otherwise), other non-polymer-based fibers, nanofibers,
nanotubes, nanoparticles and/or other performance-enhancing additives or aggregate, and which formulae (C) may have (i)
residential, commercial and/or industrial application to precast lightweight (including ultra-lightweight) cementitious
and/or concrete products, (ii) pour-in-place, tilt-up concrete and/or other non-precast applications, and/or (iii) any other
products, including those in which the material is used as a substitute for other materials such as Kevlar, in each case
[(i), (ii), and (iii)] including without limitation each of the Subject Products identified in Schedule B of this
Agreement, which is incorporated by reference herein, and any products reasonably related to the Subject Products or derived
therefrom, in each case whether consisting of patents, patentable ideas or other content, trade secrets, and/or other
proprietary intellectual property rights, together with all future modifications, enhancements, and adaptations thereof
and/or improvements thereon.

 

*This material has been omitted from the filed version.

 

Schedule B

 

 

“Subject Products”

 

		·	Ultra-Lightweight Stucco Formula AdPack

 

		·	Ultra High Performance (Non-Ultra-Lightweight) Stucco Formula AdPack

 

		·	Ultra-Lightweight Precast Manufactured Stone Panels, Veneer and Trim
Formula AdPack

 

		·	Ultra-Lightweight (Precast) Pavers and Flooring Tiles Formula AdPack

 

		·	Ultra-Lightweight (Precast) Roofing Tiles Formula AdPack 

 

		·	Ultra-Lightweight Precast Architectural Trim and Pieces Formula AdPack

 

		·	Ultra-Lightweight (Precast) Concrete Blocks Formula AdPack

 

		·	Ultra-Lightweight (Precast) Hollow-Core Slab/Panel Formula AdPack

 

		·	Ultra-Lightweight Precast Solid Wall, Barrier and Panel Formula AdPack

 

		·	Ultra-Lightweight Formula AdPack for any other precast application

 

		·	Ultra-High-Performance Ready-Mix or Other Pour-in-Place

 

  

Schedule C

 

IP Royalty Percentage Rate

 

	Gross Margin Actually Realized By Advanced	 	Percentage
	Up To 35%	 	 	0	%
	35-45%	 	 	1	%
	45.01-55%	 	 	2	%
	55.10-65%	 	 	3	%
	65.01-75%	 	 	4	%
	75.01% or More	 	 	5	%Exhibit

Exhibit 10.3

SLACK TECHNOLOGIES, INC.:
NON-PLAN SUMMARY OF STOCK GRANT
On September 6, 2017, Slack Technologies, Inc. (the “Company”) granted Transferee a restricted stock unit grant for 406,017 shares of the Company’s Class B Common Stock (the “Trust Grant”). The Company and the Transferee desire to cancel the Trust Grant in exchange for the Company agreeing to grant a restricted stock award to Transferee, as set forth below. As such, the Transferee acknowledges and agrees to cancel the Trust Grant in its entirety in exchange for the consideration set forth in this Non-Plan Summary of Stock Grant and the Non-Plan Stock Grant Agreement (the “Agreement”), and the Transferee further acknowledges that such consideration is good and sufficient consideration for every promise, duty, release, obligation, agreement, and right contained in this Agreement with respect to the cancellation of the Trust Grant. Subject to the Transferee’s acknowledgment and agreement to cancel the Trust Grant in its entirety, effective as of October 28, 2018, by signing below, the Transferee is acquiring shares of the Class B Common Stock of the Company on the following terms:
		
	Name of Transferee:
	David Riley and Sarah Friar Revocable Trust dated August 11, 2006

		
	Total Number of Transferred Shares:
	406,017

		
	Date of Transfer:
	October 28, 2018

		
	Vesting Commencement Date:
	March 8, 2017

		
	Vesting Schedule:
	The Forfeiture Condition shall lapse with respect to 1/16th of the Transferred Shares when Sarah Friar completes each quarter of continuous Service following the Vesting Commencement Date set forth above. In the event of a Change in Control and subject to Ms. Friar’s continuous Service to the Company through such event, 100% of the Transferred Shares shall vest immediately prior to the consummation of the Change in Control.

The Transferred Shares are granted outside of the Company’s 2009 Stock Plan, as amended (the “Plan”), but the relevant terms and definitions of the Plan are incorporated and included in this Agreement and shall govern the grant of the Transferred Shares hereunder. By signing below, the Transferee and the Company agree that the acquisition of the Transferred Shares is governed by the terms and conditions of the Plan, as amended, and the Non-Plan Stock Grant Agreement. Both of these documents are attached to, and made a part of, this Non-Plan Summary of Stock Grant. Electronic acceptance pursuant to the Company’s instructions to the Transferee (including through an online acceptance process) is acceptable. The Transferee further agrees that the Company may deliver by email all documents relating to the Plan or this grant (including, without limitation, a copy of the Plan) and all other documents that the Company is required to deliver to its security holders (including, without limitation, disclosures that may be required by the Securities and Exchange Commission). The Transferee also agrees that the Company may deliver these documents by 

posting them on a website maintained by the Company or by a third party under contract with the Company. If the Company posts these documents on a website, it shall notify the Transferee by email.
	
					
	TRANSFEREE:
	 
	SLACK TECHNOLOGIES, INC.

	 
	 
	 
	 
	 

	DAVID RILEY AND SARAH FRIAR REVOCABLE
	 
	By:
	/s/ David Schellhase

	TRUST DATED AUGUST 11, 2006
	 
	 
	 

	 
	 
	 
	Title:
	General Counsel

	By:
	/s/ Sarah J. Friar
	 
	 
	 

	Name:
	Sarah Friar
	 
	 
	 

	Title:
	Trustee
	 
	 
	 

	 
	 
	 
	 
	 

	Address for Mailing Stock Certificate:
	 
	 
	 

	 
	 
	 
	 
	 

	 
	 
	 
	 
	 

	Acknowledged and Agreed to by:
	 
	 
	 

	 
	 
	 
	 
	 

	SARAH FRIAR
	 
	 
	 

	 
	 
	 
	 
	 

	By:
	/s/ Sarah Friar
	 
	 
	 

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SLACK TECHNOLOGIES, INC. 
STOCK GRANT AGREEMENT
SECTION 1.     ACQUISITION OF SHARES.
(a)    Transfer. On the terms and conditions set forth in the Non-Plan Summary of Stock Grant and this Agreement, the Company agrees to transfer to the Transferee the number of Shares set forth in the Non-Plan Summary of Stock Grant. The transfer shall occur at the offices of the Company on the date of transfer set forth in the Summary of Stock Grant or at such other place and time as the parties may agree.
(b)    Consideration. The Transferee and the Company agree that the Transferred Shares are being issued to the Transferee and that the Company acknowledges receipt of the par value for such Transferred Shares.
(c)    Stock Plan and Defined Terms. Capitalized terms are defined in Section 12 of this Agreement and capitalized terms used herein but not otherwise defined have the meaning set forth in the Plan.
SECTION 2.     FORFEITURE CONDITION.
(a)    Scope of Forfeiture Condition. All Transferred Shares initially shall be Restricted Shares and shall be subject to forfeiture to the Company. The Transferee shall not transfer, assign, encumber or otherwise dispose of any Restricted Shares without the Company’s written consent, except as provided in Section 5(e) of the Plan.
(b)    Vesting. The Forfeiture Condition shall lapse and the Restricted Shares shall become vested in accordance with the vesting schedule set forth in the Summary of Stock Grant.
(c)    Execution of Forfeiture. The Forfeiture Condition shall be automatic and applicable only if the Ms. Friar’s Service terminates for any reason, with or without cause, including (without limitation) death or disability, before all Restricted Shares have become vested. In the event that Ms. Friar’s Service terminates for any reason, the certificate(s) representing any remaining Restricted Shares shall be delivered to the Company. The Company shall make no payment for Restricted Shares that are forfeited.
(d)    Additional Shares or Substituted Securities. In the event of the declaration of a stock dividend, the declaration of an extraordinary dividend payable in a form other than stock, a spinoff, a stock split, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities without receipt of consideration, any new, substituted or additional securities or other property (including money paid other than as an ordinary cash dividend) which are by reason of such transaction distributed with respect to any Restricted Shares or into which such Restricted Shares thereby become convertible shall immediately be subject to the 

3

Forfeiture Condition. Appropriate adjustments to reflect the distribution of such securities or property shall be made to the number and/or class of the Restricted Shares.
(e)    Termination of Rights as Stockholder. If Restricted Shares are forfeited in accordance with this Section 2, then the person who is to forfeit such Restricted Shares shall no longer have any rights as a holder of such Restricted Shares. Such Restricted Shares shall be deemed to have been forfeited in accordance with the applicable provisions hereof, whether or not the certificate(s) therefor have been delivered as required by this Agreement.
(f)    Escrow. Upon issuance, the certificates for Restricted Shares shall be deposited in escrow with the Company to be held in accordance with the provisions of this Agreement. Any new, substituted or additional securities or other property described in Subsection (d) above shall immediately be delivered to the Company to be held in escrow, but only to the extent the Transferred Shares are at the time Restricted Shares. All regular cash dividends on Restricted Shares (or other securities at the time held in escrow) shall be paid directly to the Transferee and shall not be held in escrow. Restricted Shares, together with any other assets or securities held in escrow hereunder, shall be (i) surrendered to the Company for forfeiture and cancellation in the event that the Forfeiture Condition or Right of First Refusal applies or (ii) released to the Transferee upon the Transferee’s request to the extent the Transferred Shares are no longer Restricted Shares (but not more frequently than once every six months). In any event, all Transferred Shares that have vested (and any other vested assets and securities attributable thereto) shall be released within 60 days after the earlier of (i) the termination of the Ms. Friar’s Service or (ii) the lapse of the Right of First Refusal.
SECTION 3.     RIGHT OF FIRST REFUSAL.
(a)    Right of First Refusal. In the event that the Transferee proposes to sell, pledge or otherwise transfer in accordance with Section 5(e) of the Plan to a third party any Transferred Shares, or any interest in Transferred Shares, the Company shall have the Right of First Refusal with respect to all (and not less than all) of such Transferred Shares. If the Transferee desires to transfer Transferred Shares, the Transferee shall give a written Transfer Notice to the Company describing fully the proposed transfer, including the number of Transferred Shares proposed to be transferred, the proposed transfer price, the name and address of the proposed Subsequent Transferee and proof satisfactory to the Company that the proposed sale or transfer will not violate any applicable federal, State or foreign securities laws. The Transfer Notice shall be signed both by the Transferee and by the proposed Subsequent Transferee and must constitute a binding commitment of both parties to the transfer of the Transferred Shares. The Company shall have the right to purchase all, and not less than all, of the Transferred Shares on the terms of the proposal described in the Transfer Notice (subject, however, to any change in such terms permitted under Subsection (b) below) by delivery of a notice of exercise of the Right of First Refusal within 30 days after the date when the Transfer Notice was received by the Company.
(b)    Transfer of Shares. If the Company fails to exercise its Right of First Refusal within 30 days after receiving the Transfer Notice, the Transferee may, not later than 90 days after the Company received the Transfer Notice, conclude a transfer of the Transferred Shares subject to the Transfer Notice on the terms and conditions described in the Transfer Notice, provided that any such sale is made in compliance with applicable federal, State and foreign securities laws and not in violation 

4

of any other contractual restrictions to which the Transferee is bound. Any proposed transfer on terms and conditions different from those described in the Transfer Notice, as well as any subsequent proposed transfer by the Transferee, shall again be subject to the Right of First Refusal and shall require compliance with the procedure described in Subsection (a) above. If the Company exercises its Right of First Refusal, the parties shall consummate the sale of the Transferred Shares on the terms set forth in the Transfer Notice within 60 days after the Company received the Transfer Notice (or within such longer period as may have been specified in the Transfer Notice); provided, however, that in the event the Transfer Notice provided that payment for the Transferred Shares was to be made in a form other than cash or cash equivalents paid at the time of transfer, the Company shall have the option of paying for the Transferred Shares with cash or cash equivalents equal to the present value of the consideration described in the Transfer Notice.
(c)    Additional or Exchanged Securities and Property. In the event of a Corporate Transaction, any other corporate reorganization, a stock split, the declaration of a stock dividend, the declaration of an extraordinary dividend payable in a form other than stock, a spinoff, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities, any securities or other property (including cash or cash equivalents) that are by reason of such transaction exchanged for, or distributed with respect to, any Transferred Shares subject to this Section 3 shall immediately be subject to the Right of First Refusal. Appropriate adjustments to reflect the exchange or distribution of such securities or property shall be made to the number and/or class of the Transferred Shares subject to this Section 3.
(d)    Termination of Right of First Refusal. Any other provision of this Section 3 notwithstanding, in the event that the Stock is readily tradable on an established securities market when the Transferee desires to transfer Transferred Shares, the Company shall have no Right of First Refusal, and the Transferee shall have no obligation to comply with the procedures prescribed by Subsections (a) and (b) above.
(e)    Permitted Transfers. This Section 3 shall not apply to a Permitted Transfer (as defined in the Plan) in accordance with the terms and conditions of the Plan. If the Transferee transfers any Transferred Shares, either under this Subsection (e) or after the Company has failed to exercise the Right of First Refusal, then this Agreement shall apply to the Subsequent Transferee to the same extent as to the Transferee.
(f)    Termination of Rights as Stockholder. If the Company makes available, at the time and place and in the amount and form provided in this Agreement, the consideration for the Shares to be purchased in accordance with this Section 3, then after such time the person from whom such Shares are to be purchased shall no longer have any rights as a holder of such Shares (other than the right to receive payment of such consideration in accordance with this Agreement). Such Shares shall be deemed to have been purchased in accordance with the applicable provisions hereof, whether or not the certificate(s) therefor have been delivered as required by this Agreement.
(g)    Assignment of Right of First Refusal. The Board of Directors may freely assign the Company’s Right of First Refusal, in whole or in part. Any person who accepts an assignment of the Right of First Refusal from the Company shall assume all of the Company’s rights and obligations under this Section 3.

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SECTION 4.     OTHER RESTRICTIONS ON TRANSFER.
(a)    Transfer Restrictions. All Shares acquired under this Agreement shall be subject to the transfer restrictions set forth in Section 5(e) of the Plan.
(b)    Transferee Representations. In connection with the issuance and acquisition of Shares under this Agreement, the Transferee hereby represents and warrants to the Company as follows:
(i)The Transferee is acquiring and will hold the Transferred Shares for investment for his or her account only and not with a view to, or for resale in connection with, any “distribution” thereof within the meaning of the Securities Act.
(ii)The Transferee understands that the Transferred Shares have not been registered under the Securities Act by reason of a specific exemption therefrom and that the Transferred Shares must be held indefinitely, unless they are subsequently registered under the Securities Act or the Transferee obtains an opinion of counsel, in form and substance satisfactory to the Company and its counsel, that such registration is not required. The Transferee further acknowledges and understands that the Company is under no obligation to register the Transferred Shares.
(iii)The Transferee is aware of the adoption of Rule 144 by the Securities and Exchange Commission under the Securities Act, which permits limited public resales of securities acquired in a non-public offering, subject to the satisfaction of certain conditions, including (without limitation) the availability of certain current public information about the issuer, the resale occurring only after the holding period required by Rule 144 has been satisfied, the sale occurring through an unsolicited “broker’s transaction,” and the amount of securities being sold during any three month period not exceeding specified limitations. The Transferee acknowledges and understands that the conditions for resale set forth in Rule 144 have not been satisfied and that the Company has no plans to satisfy these conditions in the foreseeable future.
(iv)The Transferee will not sell, transfer or otherwise dispose of the Transferred Shares in violation of the Securities Act, the Securities Exchange Act of 1934, or the rules promulgated thereunder, including Rule 144 under the Securities Act. The Transferee agrees that he or she will not dispose of the Transferred Shares unless and until he or she has complied with all requirements of this Agreement applicable to the disposition of Transferred Shares and he or she has provided the Company with written assurances, in substance and form satisfactory to the Company, that (A) the proposed disposition does not require registration of the Transferred Shares under the Securities Act or all appropriate action necessary for compliance with the registration requirements of the Securities Act or with any exemption from registration available under the Securities Act (including Rule 144) has been taken and (B) the proposed disposition will not result in the contravention of any transfer restrictions applicable to the Transferred Shares under applicable state law.
(v)The Transferee has been furnished with, and has had access to, such information as he or she considers necessary or appropriate for deciding whether to invest in the Transferred Shares, and the Transferee has had an opportunity to ask questions and receive answers from the Company regarding the terms and conditions of the issuance of the Transferred Shares.

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(vi)The Transferee is aware that his or her investment in the Company is a speculative investment that has limited liquidity and is subject to the risk of complete loss. The Transferee is able, without impairing his or her financial condition, to hold the Transferred Shares for an indefinite period and to suffer a complete loss of his or her investment in the Transferred Shares.
(vii)The Transferee represents and warrants to the Company that he or she is an “accredited investor” within the meaning of Rule 501 of Regulation D promulgated under the Securities Act, as presently in effect.
(c)    Securities Law Restrictions. Regardless of whether the offering and sale of Shares under the Plan have been registered under the Securities Act or have been registered or qualified under the securities laws of any State, the Company at its discretion may impose restrictions upon the sale, pledge or other transfer of the Transferred Shares (including the placement of appropriate legends on stock certificates or the imposition of stoptransfer instructions) if, in the judgment of the Company, such restrictions are necessary or desirable in order to achieve compliance with the Securities Act, the securities laws of any State or any other law.
(d)    Market Stand-Off. In connection with any underwritten public offering by the Company of its equity securities pursuant to an effective registration statement filed under the Securities Act, including the Company’s initial public offering, the Transferee or a Subsequent Transferee shall not directly or indirectly sell, make any short sale of, loan, hypothecate, pledge, offer, grant or sell any option or other contract for the purchase of, purchase any option or other contract for the sale of, or otherwise dispose of or transfer, or agree to engage in any of the foregoing transactions with respect to, any Transferred Shares without the prior written consent of the Company or its managing underwriter. Such restriction (the “Market Stand-Off”) shall be in effect for such period of time following the date of the final prospectus for the offering as may be requested by the Company or such underwriter. In no event, however, shall such period exceed 180 days plus such additional period as may reasonably be requested by the Company or such underwriter to accommodate regulatory restrictions on (i) the publication or other distribution of research reports or (ii) analyst recommendations and opinions, including (without limitation) the restrictions set forth in Rule 2711(f)(4) of the National Association of Securities Dealers and Rule 472(f)(4) of the New York Stock Exchange, as amended, or any similar successor rules. The Market Stand-Off shall in any event terminate two years after the date of the Company’s initial public offering. In the event of the declaration of a stock dividend, a spinoff, a stock split, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities without receipt of consideration, any new, substituted or additional securities which are by reason of such transaction distributed with respect to any Shares subject to the Market Stand-Off, or into which such Shares thereby become convertible, shall immediately be subject to the Market Stand-Off. In order to enforce the Market Stand-Off, the Company may impose stop-transfer instructions with respect to the Transferred Shares until the end of the applicable stand-off period. The Company’s underwriters shall be beneficiaries of the agreement set forth in this Subsection (d). This Subsection (d) shall not apply to Shares registered in the public offering under the Securities Act.
(e)    Rights of the Company. The Company shall not be required to (i) transfer on its books any Transferred Shares that have been sold or transferred in contravention of this Agreement or (ii) treat 

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as the owner of Transferred Shares, or otherwise to accord voting, dividend or liquidation rights to, any Subsequent Transferee to whom Transferred Shares have been transferred in contravention of this Agreement.
(f)    Waiver of Statutory Information Rights. The Transferee understands and agrees that, but for the waiver made herein, the Transferee would be entitled, upon written demand under oath stating the purpose thereof, to inspect for any proper purpose, and to make copies and extracts from, the Company’s stock ledger, a list of its stockholders, and its other books and records, and the books and records of subsidiaries of the Company, if any, under the circumstances and in the manner provided in Section 220 of the General Corporation Law of Delaware (any and all such rights, and any and all such other rights of the Transferee as may be provided for in Section 220, the “Inspection Rights”). In light of the foregoing, until the first sale of Stock of the Company to the general public pursuant to a registration statement filed with and declared effective by the Securities and Exchange Commission under the Securities Act, the Transferee hereby unconditionally and irrevocably waives the Inspection Rights, whether such Inspection Rights would be exercised or pursued directly or indirectly pursuant to Section 220 or otherwise, and covenants and agrees never to directly or indirectly commence, voluntarily aid in any way, prosecute, assign, transfer, or cause to be commenced any claim, action, cause of action, or other proceeding to pursue or exercise the Inspection Rights. The foregoing waiver shall not affect any rights of a director, in his or her capacity as such, under Section 220. The foregoing waiver shall not apply to any contractual inspection rights of the Transferee under any other written agreement between the Transferee and the Company.
SECTION 5.     SUCCESSORS AND ASSIGNS.
Except as otherwise expressly provided to the contrary, the provisions of this Agreement shall inure to the benefit of, and be binding upon, the Company and its successors and assigns and be binding upon the Transferee and the Transferee’s legal representatives, heirs, legatees, distributees, assigns and transferees by operation of law, whether or not any such person has become a party to this Agreement or has agreed in writing to join herein and to be bound by the terms, conditions and restrictions hereof.
SECTION 6.     NO RETENTION RIGHTS.
Nothing in this Agreement or in the Plan shall confer upon Ms. Friar any right to continue providing services to the Company for any period of specific duration or interfere with or otherwise restrict in any way the rights of the Company or of Ms. Friar, which rights are hereby expressly reserved by each, to terminate her service at any time and for any reason, with or without cause.
SECTION 7.     TAX MATTERS.
(a)    Section 83(b) Election. The acquisition of the Transferred Shares may result in adverse tax consequences that may be avoided or mitigated by filing an election under Code Section 83(b). Such election may be filed only within 30 days after the date of transfer set forth in the Summary of Stock Grant. The form for making the Code Section 83(b) election is attached to this Agreement as an Exhibit. The Transferee should consult with his or her tax advisor to 

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determine the tax consequences of acquiring the Transferred Shares and the advantages and disadvantages of filing the Code Section 83(b) election. The Transferee acknowledges that it is his or her sole responsibility, and not the Company’s, to file a timely election under Code Section 83(b), even if the Transferee requests the Company or its representatives to make this filing on his or her behalf.
(b)    Tax Withholding. As a condition to the transfer of the Transferred Shares to the Transferee, Transferee shall make arrangements to the satisfaction of the Company for the payment of all federal, state, local or foreign withholding tax obligations that may arise in connection with such transfer or in connection with Transferee’s election under Code Section 83(b).
SECTION 8.     LEGENDS.
All certificates evidencing Transferred Shares shall bear the following legends: 
“THE SHARES REPRESENTED HEREBY MAY NOT BE SOLD, ASSIGNED, TRANSFERRED, ENCUMBERED OR IN ANY MANNER DISPOSED OF, EXCEPT IN COMPLIANCE WITH THE TERMS OF A WRITTEN AGREEMENT BETWEEN THE COMPANY AND THE REGISTERED HOLDER OF THE SHARES (OR THE PREDECESSOR IN INTEREST TO THE SHARES). SUCH AGREEMENT GRANTS TO THE COMPANY CERTAIN RIGHTS OF FIRST REFUSAL UPON AN ATTEMPTED TRANSFER OF THE SHARES AND IMPOSES CERTAIN FORFEITURE CONDITIONS UPON TERMINATION OF SERVICE WITH THE COMPANY. THE SECRETARY OF THE COMPANY WILL UPON WRITTEN REQUEST FURNISH A COPY OF SUCH AGREEMENT TO THE HOLDER HEREOF WITHOUT CHARGE.”
“THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED.”
If required by the authorities of any State in connection with the issuance of the Transferred Shares, the legend or legends required by such State authorities shall also be endorsed on all such certificates.
SECTION 9.     NOTICE.
Any notice required by the terms of this Agreement shall be given in writing. It shall be deemed effective upon (i) personal delivery, (ii) deposit with the United States Postal Service, by registered or certified mail, with postage and fees prepaid or (iii) deposit with Federal Express Corporation, with shipping charges prepaid. Notice shall be addressed to the Company at its principal executive office and to the Transferee at the address that he or she most recently provided to the Company in accordance with this Section 9.

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SECTION 10.     ENTIRE AGREEMENT.
The Summary of Stock Grant, this Agreement and the Plan constitute the entire contract between the parties hereto with regard to the subject matter hereof. They supersede any other agreements, representations or understandings (whether oral or written and whether express or implied) that relate to the subject matter hereof.
SECTION 11.     CHOICE OF LAW.
This Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware, as such laws are applied to contracts entered into and performed in such State.
SECTION 12.     DEFINITIONS.
(a)    “Agreement” shall mean this Non-Plan Stock Grant Agreement.
(b)    “Board of Directors” shall mean the Board of Directors of the Company, as constituted from time to time or, if a Committee has been appointed, such Committee.
(c)    “Change in Control” shall mean the consummation of (i) the sale of all or substantially all of the assets of the Company on a consolidated basis to an unrelated person or entity; (ii) a merger, reorganization or consolidation pursuant to which the holders of the Company’s outstanding voting power immediately prior to such transaction do not own a majority of the outstanding voting power of the surviving or resulting entity (or its ultimate parent, if applicable); or (iii) the acquisition of all or a majority of the outstanding voting stock of the Company in a single transaction or a series of related transactions; provided however that a merger effected solely to change the Company’s domicile shall not constitute a Change in Control.
(d)    “Code” shall mean the Internal Revenue Code of 1986, as amended.
(e)    “Committee” shall mean a committee of the Board of Directors, as described in Section 2 of the Plan.
(f)    “Company” shall mean Slack Technologies, Inc., a Delaware corporation.
(g)    “Consultant” shall mean a person who performs bona fide services for the Company, a Parent or a Subsidiary as a consultant or advisor, excluding Employees and Outside Directors.
(h)    “Employee” shall mean any individual who is a commonlaw employee of the Company, a Parent or a Subsidiary.
(i)    “Fair Market Value” shall mean the fair market value of a Share, as determined by the Board of Directors in good faith. Such determination shall be conclusive and binding on all persons.
(j)    “Forfeiture Condition” shall mean the forfeiture condition described in Section 2.

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(k)    “Outside Director” shall mean a member of the Board of Directors who is not an Employee.
(l)    “Parent” shall mean any corporation (other than the Company) in an unbroken chain of corporations ending with the Company, if each of the corporations other than the Company owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations in such chain.
(m)    “Plan” shall mean the Slack Technologies, Inc. 2009 Stock Plan, as amended.
(n)    “Restricted Share” shall mean a Transferred Share that is subject to the Forfeiture Condition.
(o)    “Right of First Refusal” shall mean the Company’s right of first refusal described in Section 3.
(p)    “Securities Act” shall mean the Securities Act of 1933, as amended.
(q)    “Service” shall mean Ms. Friar’s service as an Employee, Outside Director or Consultant.
(r)    “Share” shall mean one share of Stock, as adjusted in accordance with Section 8 of the Plan (if applicable).
(s)    “Stock” shall mean the Class B Common Stock of the Company.
(t)    “Subsequent Transferee” shall mean any person to whom the Transferee has directly or indirectly transferred any Transferred Shares.
(u)    “Subsidiary” shall mean any corporation (other than the Company) in an unbroken chain or corporations beginning with the Company, if each of the corporations other than the last corporation in the unbroken chain owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations in such chain.
(v)    “Summary of Stock Grant” shall mean the document so entitled to which this Agreement is attached.
(w)    “Transferee” shall mean the entity named in the Summary of Stock Grant.
(x)    “Transfer Notice” shall mean the notice of a proposed transfer of Transferred Shares described in Section 3.
(y)    “Transferred Shares” shall mean the Shares acquired by the Transferee pursuant to this Agreement.

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