Document:

Exhibit 4.3

DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934
The following description of the common stock, par value $0.0001 per share, of Natera, Inc. (“us,” “our,” “we,” or the “Company”), which is the only security of the Company registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”),  summarizes certain information regarding the Common Stock in our amended and restated certificate of incorporation, our amended and restated by-laws and applicable provisions of Delaware general corporate law (the “DGCL”), and is qualified by reference to our amended and restated certificate of incorporation and our amended and restated by-laws, which are incorporated by reference as Exhibit 3.1 and Exhibit 3.2, respectively, to the Annual Report on Form 10-K for the fiscal year ending December 31, 2020. 
Our authorized capital stock consists of 750,000,000 shares of common stock, par value $0.0001 per share, and 50,000,000 shares of preferred stock, par value, $0.0001 per share.
Common Stock
Our common stock is listed on the Nasdaq Global Select Market under the symbol “NTRA”.
Voting Rights. Each holder of common stock is entitled to one vote per share on all matters submitted to a vote of stockholders. We have not provided for cumulative voting in the election of directors.
Dividends. Subject to preferences that may apply to shares of preferred stock outstanding at the time, the holders of outstanding shares of our common stock are entitled to receive dividends out of assets legally available at the times and in the amounts that our board of directors may determine from time to time.
Liquidation and Dissolution. In the event of our liquidation, dissolution or winding-up, the holders of common stock are entitled to share ratably in all assets remaining after payment of all liabilities and the liquidation preferences of any outstanding preferred stock.
Other Rights. Holders of common stock have no preemptive or conversion rights or other subscription rights. There are no redemption or sinking fund provisions applicable to our common stock.
Anti-Takeover Effects of Provisions of Delaware Law and Our Certificate of Incorporation and Bylaws
Certain provisions of the DGCL, our amended and restated certificate of incorporation and our amended and restated bylaws could have the effect of delaying, deferring or discouraging another party from acquiring control of us. These provisions, which are summarized below, are expected to discourage certain types of coercive takeover practices and inadequate takeover bids. These provisions are also designed, in part, to encourage persons seeking to acquire control of us to first negotiate with our board of directors. We believe that the benefits of increased protection of our potential ability to negotiate with an unfriendly or unsolicited acquirer outweigh the disadvantages of discouraging such proposals, including proposals that are priced above the then-current market value of our common stock, because, among other reasons, the negotiation of such proposals could result in an improvement of their terms.
Certificate of Incorporation and Bylaws
        Our amended and restated certificate of incorporation and amended and restated bylaws include provisions that:
		•	authorize our board of directors to issue, without further action by the stockholders, up to 50,000,000 shares of undesignated preferred stock;

		•	require that any action to be taken by our stockholders be effected at a duly called annual or special meeting and not by written consent;

​

Exhibit 4.3

		•	specify that special meetings of our stockholders can be called only by our board of directors, our chairman of the board, or our chief executive officer;

		•	establish an advance notice procedure for stockholder approvals to be brought before an annual meeting of our stockholders, including proposed nominations of persons for election to our board of directors;

		•	establish that our board of directors is divided into three classes, Class I, Class II and Class III, with each class serving staggered terms;

		•	provide that our directors may be removed only for cause;

		•	provide that vacancies on our board of directors may, except as otherwise required by law, be filled only by a majority of directors then in office, even if less than a quorum;

		•	specify that no stockholder is permitted to cumulate votes at any election of directors; and

		•	require a super-majority of votes to amend certain of the above-mentioned provisions.

Delaware Law
        We are subject to the provisions of Section 203 of the Delaware General Corporation Law regulating corporate takeovers. Section 203 prohibits a Delaware corporation, under certain circumstances, from engaging in a business combination with any interested stockholder for a period of three years after the date that such stockholder became an interested stockholder, unless:
		•	before such date, the board of directors of the corporation approved either the business combination or the transaction that resulted in the stockholder becoming an interested stockholder;

		•	upon the closing of the transaction that resulted in the stockholder becoming an interested stockholder, the interested stockholder owned at least 85% of the voting stock of the corporation outstanding at the time the transaction began, excluding for purposes of determining the voting stock outstanding (but not the outstanding voting stock owned by the interested stockholder) those shares owned by (i) persons who are directors and also officers and (ii) employee stock plans in which employee participants do not have the right to determine confidentially whether shares held subject to the plan will be tendered in a tender or exchange offer; or

		•	on or after such date, the business combination is approved by the board of directors and authorized at an annual or special meeting of the stockholders by at least two-thirds of the outstanding voting stock which is not owned by the interested stockholder.

        In general, Section 203 defines business combination to include:
		•	any merger or consolidation involving the corporation and the interested stockholder;

		•	any sale, transfer, pledge or other disposition of 10% or more of the assets of the corporation involving the interested stockholder;

		•	subject to certain exceptions, any transaction that results in the issuance or transfer by the corporation of any stock of the corporation to the interested stockholder;

		•	any transaction involving the corporation that has the effect of increasing the proportionate share of the stock or any class or series of the corporation beneficially owned by the interested stockholder; or

		•	the receipt by the interested stockholder of the benefit of any loss, advances, guarantees, pledges or other financial benefits by or through the corporation.

        In general, Section 203 defines an interested stockholder as any entity or person who, together with the entity's or person's affiliates and associates, beneficially owns, or within three years prior to the time of determination of interested stockholder status did own, 15% or more of the outstanding voting stock of the corporations.

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Exhibit 4.3

        A Delaware corporation may "opt out" of these provisions with an express provision in its original certificate of incorporation or an express provision in its amended and restated certificate of incorporation or amended and restated bylaws resulting from a stockholders' amendment approved by at least a majority of the outstanding voting shares. We have not opted out of these provisions. As a result, mergers or other takeover or change in control attempts of us may be discouraged or prevented.

​Exhibit 4.1

 

[Form of Class A Ordinary Share Certificate]

 

NUMBER

 

C-

 

	 	SHARES
	 	SEE REVERSE FOR
	 	CERTAIN DEFINITIONS
	 	CUSIP [             ]

 

TortoiseEcofin
Acquisition Corp. III

INCORPORATED UNDER THE LAWS OF THE CAYMAN ISLANDS

CLASS A ORDINARY SHARES

 

This Certifies that

 

is the owner of

 

FULLY PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF US$0.0001
EACH OF THE CLASS A ORDINARY SHARES OF

 

TortoiseEcofin
Acquisition Corp. III

(THE “COMPANY”)

 

transferable on the books of the Company in person or by duly
authorized attorney upon surrender of this certificate properly endorsed, and subject to the Company’s amended and restated
memorandum and articles of association, as the same may be amended from time to time (the “Memorandum and Articles”).
The Company will be forced to redeem all of its Class A ordinary shares if it is unable to complete a business combination within
the period of time set forth in the Company’s Memorandum and Articles, as more fully described in the Company’s final
prospectus dated , 2021.

 

This certificate is not valid unless countersigned by the Transfer
Agent and registered by the Registrar.

 

Witness the facsimile signatures of its
duly authorized officers.

 

	 	 	 
	Secretary	Cayman Islands	Chief Executive Officer 

 

     

     

    

 

TortoiseEcofin
Acquisition Corp. III

 

The Company will furnish without charge to each shareholder
who so requests the powers, designations, preferences and relative, participating, optional or other special rights of each class
of shares or series thereof of the Company and the qualifications, limitations or restrictions of such preferences and/or rights.
This certificate and the shares represented thereby are issued and shall be held subject to all the provisions of the Company’s
Memorandum and Articles and resolutions of the Board of Directors providing for the issue of securities (copies of which may be
obtained from the secretary of the Company), to all of which the holder of this certificate by acceptance hereof assents. The following
abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out
in full according to applicable laws or regulations:

 

	TEN COM	—	as tenants in common	UNIF GIFT MIN ACT —	Custodian	 	 
	TEN ENT	—	as tenants by the entireties	 	(Cust)	 	(Minor)
	JT TEN	—	as joint tenants with right of survivorship and not as tenants in common	 	under Uniform Gifts to Minors
	 	 

 

	 	 	 	 	Act	            
	 	 	 	 	(State)

 

Additional abbreviations may also be used though not in the
above list.

For value received,                     
hereby sells, assigns and transfers unto

 

 

(PLEASE INSERT SOCIAL SECURITY OR OTHER
IDENTIFYING NUMBER(S) OF ASSIGNEE(S))

 

 

(PLEASE PRINT OR TYPEWRITE NAME(S) AND ADDRESS(ES),
INCLUDING ZIP CODE, OF ASSIGNEE(S))

 

 

 

 

 

 

 

shares represented by the within Certificate, and hereby irrevocably
constitutes and appoints                    Attorney
to transfer the said shares on the books of the within named Company with full power of substitution in the premises.

 

Dated:

 

 

NOTICE: THE SIGNATURE(S) TO THIS ASSIGNMENT MUST CORRESPOND
WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE
WHATEVER.

 

Signature(s) Guaranteed:

By

 

 

THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR
INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE
MEDALLION PROGRAM, PURSUANT TO THE U.S. SECURITIES AND EXCHANGE COMMISSION RULE 17Ad-15 (OR ANY SUCCESSOR RULE)) UNDER THE SECURITIES
EXCHANGE ACT OF 1934, AS AMENDED.

 

In each case, as more fully described in
the Company’s final prospectus dated                        , 2021, the holder(s) of the shares represented by this certificate shall be entitled
to receive a pro-rata portion of certain funds held in the trust account established in connection with the Company’s initial
public offering only in the event that (i) the Company redeems the Class A ordinary shares sold in its initial public offering
and liquidates because it does not consummate an initial business combination within the period of time set forth in the Memorandum
and Articles, (ii) the Company redeems the Class A ordinary shares sold
in its initial public offering in connection with a shareholder vote to approve an amendment to the Memorandum and Articles that
would affect the substance or timing of the Company’s obligation to redeem 100% of the Class A ordinary shares if it does
not consummate an initial business combination within the time period set forth therein or
(iii) if the holder(s) seek(s) to redeem for cash his, her or its respective Class A ordinary shares in connection with
a tender offer (or proxy solicitation, solely in the event the Company seeks shareholder approval of the proposed initial business
combination) setting forth the details of a proposed initial business combination. In no other circumstances shall the holder(s)
have any right or interest of any kind in or to the trust account.

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