Sientra 8K Announces $60 Million Convertible Notes Investment from | SIENQ 12 Mar 20

Exhibit 10.3

EXECUTION VERSION

REGISTRATION RIGHTS AGREEMENT

This REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of March 11, 2020, is entered into by and among Sientra, Inc., a Delaware corporation (the “Company”), and Deerfield Partners, L.P. (the “Closing Date Lender”).

WHEREAS:

A. In connection with the Facility Agreement, of even date herewith (the “Facility Agreement”), by and among the Company, the other Loan Parties (as defined therein), the lenders party thereto from time to time (the “Lenders”), and Deerfield Partners, L.P., as agent for itself and the Lenders (i) the Company has agreed, upon the terms and subject to the conditions contained therein, to execute and deliver Convertible Notes (as defined below) to the Lenders in the amounts described in the Facility Agreement, each of which is convertible into shares of the Company’s common stock (the “Common Stock”); and

B. To induce the Lenders to execute and deliver the Facility Agreement, the Company has agreed to provide certain registration rights under the Securities Act of 1933, as amended, and the rules and regulations thereunder, or any similar successor statute (collectively, the “Securities Act”), and applicable state securities laws;

NOW, THEREFORE, in consideration of the premises and the mutual covenants contained herein and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and intending to be legally bound hereby, the Company and the Closing Date Lender hereby agree as follows:

1. DEFINITIONS.

a. As used in this Agreement, the following terms shall have the following meanings:

(i) “Additional Filing Deadline” means, with respect to any Registration Statements that may be required pursuant to Section 2(a)(ii), (A) the first date or time that such Registrable Securities may then be included in a Registration Statement if such Registration Statement is required because the SEC shall have notified the Company in writing that certain Registrable Securities were not eligible for inclusion on a previously filed Registration Statement, or (B) if such additional Registration Statement is required for a reason other than as described in (A) above, the twentieth (20^th) day following the date on which the Company first knows, or reasonably should have known, that such additional Registration Statement is required.

(ii) “Additional Registration Deadline” means, with respect to any additional Registration Statement(s) required pursuant to Section 2(a)(ii), the thirtieth (30th) day following (A) the first date or time that such Registrable Securities may then be included in a Registration Statement if such Registration Statement is required because the SEC shall have notified the Company in writing that certain Registrable Securities were not eligible for inclusion on a previously filed

Registration Statement, or (B) if such additional Registration Statement is required for a reason other than as described in (A) above, the fortieth (40th) day following the date on which the Company first knows, or reasonably should have known, that such additional Registration Statement(s) is required.

(iii) “Convertible Notes” means the Convertible Notes executed and delivered by the Company to each of the Lenders pursuant to the Facility Agreement.

(iv) “Investor” means the Closing Date Lender and any transferee or assignee who agrees to become bound by the provisions of this Agreement in accordance with Section 10 hereof.

(v) “Exchange Act” means the Securities Exchange Act of 1934, as amended, together with the rules and regulations promulgated thereunder, and any successor statute.

(vi) “FINRA” means the Financial Industry Regulatory Authority (or successor thereto).

(vii) “Filing Deadline,” for the Registration Statement required pursuant to Section 2(a)(i), means the date that is thirty (30) calendar days following the Issuance Date, and, for each Registration Statement required pursuant to Section 2(a)(ii) means the Additional Filing Deadline.

(viii) “Issuance Date” means March 11, 2020.

(ix) “Person” means and includes any natural person, partnership, joint venture, corporation, trust, limited liability company, limited company, joint stock company, unincorporated organization, government entity or any political subdivision or agency thereof, or any other entity.

(x) “Prospectus” means (i) any prospectus (preliminary or final) included in any Registration Statement, as may be amended or supplemented by any prospectus supplement with respect to the terms of the offering of any portion of the Registrable Securities covered by such Registration Statement and by all other amendments and supplements to such prospectus, including post-effective amendments, and all material incorporated by reference in such prospectus, and (ii) any “free writing prospectus” as defined in Rule 405 under the Securities Act (or any successor rule thereto) relating to any offering of Registrable Securities pursuant to a Registration Statement.

(xi) “Register,” “Registered,” and “Registration” refer to a registration effected by preparing and filing a Registration Statement or Statements in compliance with the Securities Act and pursuant to Rule 415 under the Securities Act and the declaration or ordering of effectiveness of such Registration Statement by the United States Securities and Exchange Commission (the “SEC”).

(xii) “Registrable Securities,” means (a) any shares of Common Stock (the “Conversion Shares”) issued or issuable pursuant to the Convertible Notes (without giving effect to any limitations on conversion set forth in the Convertible Notes), (b) any additional shares of

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Common Stock issuable in connection with any anti-dilution provisions in the Convertible Notes, (c) any other shares of Common Stock issuable pursuant to the terms of the Convertible Notes, the Facility Agreement or this Agreement, and (d) any securities issued or issuable upon any stock split, dividend, distribution, recapitalization, reorganization, reclassification or similar event with respect to any of the foregoing.

(xiii) “Registration Deadline” shall mean, for purposes of the Registration Statement required pursuant to Section 2(a)(i), the earlier of (i) the date that is seventy-five (75) days after the date that the applicable Registration Statement is actually filed or (ii) the date that is seventy-five (75) days after the applicable Filing Deadline and, with respect to any Registration Statement required pursuant to Section 2(a)(ii), the Additional Registration Deadline.

(xiv) “Registration Statement(s)” means any registration statement(s) of the Company filed under the Securities Act that covers the resale of any of the Registrable Securities pursuant to the provisions of this Agreement, all amendments and supplements to such Registration Statement, including post-effective amendments, and all exhibits to, and all material incorporated by reference in, such Registration Statement.

(xv) “Rule 415” means Rule 415 under the Securities Act or any successor rule providing for the offering of securities on a continuous basis.

2. REGISTRATION.

a.MANDATORY REGISTRATION.(i) Following the Issuance Date, the Company shall prepare, and, on or prior to the applicable Filing Deadline, file with the SEC a Registration Statement (the “Mandatory Registration Statement”) on Form S-3 (or, if FormS-3 is not then available, on such form of Registration Statement as is then available to effect a Registration of the Registrable Securities, subject to the consent of the Investors, which consent shall not be unreasonably withheld) covering the resale of the Registrable Securities, which Registration Statement, to the extent allowable under the Securities Act and the rules and regulations promulgated thereunder (including Rule 416), shall state that such Registration Statement also covers such indeterminate number of additional shares of Common Stock as may become issuable pursuant to the Convertible Notes or the Conversion Shares to prevent dilution resulting from stock splits, stock dividends, stock issuances or similar transactions. The number of shares of Common Stock initially included in such Registration Statement shall be no less than the aggregate number of Conversion Shares that are then issuable pursuant to the Convertible Notes, without regard to any limitations on the Investors’ ability to convert the Convertible Notes. Each Registration Statement (and each amendment or supplement thereto, and each request for acceleration of effectiveness thereof) shall be provided to (and shall be subject to the approval, which shall not be unreasonably withheld or delayed, of) the Investors and their counsel prior to its filing or other submission.

(ii) If for any reason, despite the Company’s use of its reasonable best efforts to include all of the Registrable Securities in the Registration Statement filed pursuant to Section 2 (a)(i) above (and subject to Section 3(q) below), the SEC does not permit all of the Registrable Securities to be included in, or for any other reason any Registrable Securities are not then included

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in, such Registration Statement, then the Company shall prepare, and, as soon as practicable but in no event later than the Additional Filing Deadline, file with the SEC an additional Registration Statement covering the resale of all Registrable Securities not already covered by an existing and effective Registration Statement for an offering to be made on a continuous basis pursuant to Rule 415.

b.PIGGY-BACK REGISTRATIONS.If at any time prior to the expiration of the Registration Period (as hereinafter defined) the Company shall determine (i) to file with the SEC a registration statement under the Securities Act relating to an offering for its own account or for the account of any other holder of its equity securities (other than securities being registered on FormS-4 or FormS-8 or their then equivalents relating to equity securities to be issued solely in connection with any acquisition of any entity or business or equity securities issuable in connection with stock option or other employee benefit plans), and/or (ii) otherwise to effect an underwritten offering of any securities of the Company of a type included in a then effective Registration Statement, the Company shall send to each Investor written notice of such determination, and if within fifteen (15) days after the effective date of such notice the Investor shall so request in writing, the Company shall include in such Registration Statement and/or include in such underwritten offering, as applicable, all or any part of such Investor’s Registrable Securities that the Investor requests to be registered and/or included in the underwritten offering, as applicable, except that if in connection with any underwritten offering for the account of the Company, the managing underwriter(s) thereof shall impose a limitation on the number of Registrable Securities which may be included in such offering because, in such underwriter(s)’ reasonable judgment, marketing or other factors dictate such limitation is necessary to facilitate public distribution, then the Company shall be obligated to include in such underwritten offering only such limited portion of the Registrable Securities with respect to which the Investor has requested inclusion hereunder as the underwriter(s) shall permit;

provided, however, that the Company shall not exclude any Registrable Securities unless the Company has first excluded all outstanding securities to be sold for the accounts of any holders of the Company’s equity securities which are not entitled by contract to inclusion of such securities in an underwritten offering or are not entitled to pro rata inclusion with the Registrable Securities; and

provided, further, however, that, after giving effect to the immediately preceding proviso, any exclusion of Registrable Securities shall be made pro rata with holders of other securities having the contractual right to include such securities in such underwritten offering other than holders of securities entitled to inclusion of their securities in such underwritten offering by reason of demand registration rights. No right to registration of Registrable Securities under this Section 2(b) shall be construed to limit any Registration required under Section 2(a) hereof. If an Investor’s Registrable Securities are included in an underwritten offering pursuant to this Section 2(b), then such Investor shall, unless otherwise agreed by the Company, offer and sell such Registrable Securities in such underwritten offering using the same underwriter or underwriters and, subject to the provisions of this Agreement, on the same terms and conditions as other shares of Common Stock included in such underwritten offering. Notwithstanding anything to the contrary set forth herein, the rights of the Investors pursuant

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to this Section 2(b) shall only be available in the case of an underwritten offering or in the event the Company fails to timely file, obtain effectiveness or maintain effectiveness of any Registration Statement to be filed pursuant to Section 2(a) in accordance with the terms of this Agreement.

3. OBLIGATIONS OF THE COMPANY.In connection with any registration of the Registrable Securities hereunder, the Company shall have the following obligations:

a. The Company shall prepare promptly, and file with the SEC as soon as practicable after such registration obligation arises hereunder (but in no event later than the applicable Filing Deadline), a Registration Statement with respect to the number of Registrable Securities provided in Section 2(a), as applicable, and thereafter use its reasonable best efforts to cause each such Registration Statement relating to Registrable Securities to become effective as soon as possible after such filing, but in any event shall use its reasonable best efforts to cause each such Registration Statement relating to Registrable Securities to become effective no later than the Registration Deadline, and shall thereafter use its reasonable best efforts to keep the Registration Statement current and effective pursuant to Rule 415 at all times after its effective date until such date as is the earlier of (i) the date on which all of the Registrable Securities included in such Registration Statement have been sold and (ii) the date on which all of the Registrable Securities included in such Registration Statement (in the opinion of counsel to the Investors) may be immediately sold to the public without registration or restriction (including without limitation as to volume by each holder thereof), and without compliance with any “current public information” requirement, pursuant to Rule 144 under the Securities Act (the “Registration Period”), which Registration Statement (including any amendments or supplements thereto and prospectuses contained therein), except for information provided in writing by an Investor pursuant to Section 4(a), shall not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein, or necessary to make the statements therein not misleading. In the event that FormS-3 is not available for the Registration of the resale of any Registrable Securities hereunder (but, for the avoidance of doubt, without in any way affecting the Company’s obligation to register the resale of the Registrable Securities on such other form as is available, as provided in Section 2(a)), (i) the Company shall undertake to file, within twenty (20) days of such time as such form is available for such Registration, a post-effective amendment to the Registration Statement then in effect, or otherwise file a Registration Statement on FormS-3, registering such Registrable Securities on FormS-3;provided that the Company shall maintain the effectiveness of the Registration Statement then in effect until such time as a Registration Statement (or post-effective amendment) on FormS-3 covering such Registrable Securities has been declared effective by the SEC, and (ii) the Company shall provide that any Registration Statement on FormS-1 filed hereunder shall incorporate documents by reference (including by way of forward incorporation by reference) to the maximum extent possible.

b. The Company shall prepare and file with the SEC such amendments (including post-effective amendments) and supplements to each Registration Statement and the prospectus used in connection with each Registration Statement as may be necessary to keep each Registration Statement current and effective at all times during the Registration Period, and, during

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the Registration Period, shall comply with the provisions of the Securities Act with respect to the disposition of all Registrable Securities of the Company covered by each Registration Statement until such time as all of such Registrable Securities have been disposed of in accordance with the intended methods of disposition by the seller or sellers thereof as set forth in such Registration Statement. In the event that on any Trading Day (as defined below) (the “Registration Trigger Date”) the number of shares available under the Registration Statements filed pursuant to this Agreement is insufficient to cover all of the Registrable Securities issued or issuable pursuant to the Convertible Notes, including any additional shares of Common Stock issued in connection with any anti-dilution provisions contained in the Convertible Notes, without giving effect to any limitations on the Investors’ ability to convert the Convertible Notes, the Company shall amend the Registration Statements, or file a new Registration Statement (on the short form available therefor, if applicable), or both, so as to cover the total number of Registrable Securities so issued or issuable (without giving effect to any limitations on exercise contained in the Convertible Notes) as of the Registration Trigger Date as soon as practicable, but in any event within twenty (20) days after the Registration Trigger Date. The Company shall use its reasonable best efforts to cause such amendment and/or new Registration Statement to become effective as soon as practicable following the filing thereof, but in any event the Company shall cause such amendment and/or new Registration Statement to become effective within sixty (60) days of the Registration Trigger Date or as promptly as practicable in the event the Company is required to increase its authorized shares. “Trading Day” shall mean any day on which the Common Stock is traded for any period on the NASDAQ Global Select Market (the “NasdaqGS”), or if not the NasdaqGS, the principal securities exchange or other securities market on which the Common Stock is then being traded.

c. The Company shall furnish to each Investor and its legal counsel (i) promptly after the same is prepared and publicly distributed, filed with the SEC or received by the Company, one copy of each Registration Statement and any amendment thereto, each preliminary prospectus and prospectus and each amendment or supplement thereto, and, in the case of a Registration Statement referred to in Section 2(a), each letter written by or on behalf of the Company to the SEC or the staff of the SEC, and each item of correspondence from the SEC or the staff of the SEC, in each case relating to such Registration Statement (other than any portion of any thereof which contains information for which the Company has obtained confidential treatment, which contains information for which the Company has redacted in compliance with Regulation S-K Item 601(b)(10), which contains or reflects any materialnon-public information with respect to the Company or its securities or which relates to Company matters that are in the reasonable judgment of the Company not relevant to the Investor’s interests with respect to the Registrable Securities), and (ii) such number of copies of a prospectus, including a preliminary prospectus, and all amendments and supplements thereto and such other documents as an Investor may reasonably request in order to facilitate the disposition of the Registrable Securities owned by such Investor; provided that the Company may determine in its reasonable judgment to provide any such copies in electronic form only. The Company will promptly notify each of the Investors by electronic mail of the effectiveness of each Registration Statement or any post-effective amendment. The Company will promptly respond to any and all comments received from the SEC as soon as practicable and, as soon as practicable, but in no event later than three (3) business days, following the resolution or

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clearance of all SEC comments or, if applicable, following notification by the SEC that any such Registration Statement or any amendment thereto will not be subject to review, shall file a request for acceleration of effectiveness of such Registration Statement to a time and date not later than two (2) business days after the submission of such request. No later than the first business day after such Registration Statement becomes effective, the Company will file with the SEC the final prospectus included therein pursuant to Rule 424 (or successor thereto) under the Securities Act.

d. The Company shall use its reasonable best efforts to (i) register and qualify, in any jurisdiction where registration and/or qualification is required, the Registrable Securities covered by the Registration Statements under such other securities or “blue sky” laws of such jurisdictions in the United States as the Investors shall reasonably request, (ii) prepare and file in those jurisdictions such amendments (including post-effective amendments) and supplements to such registrations and qualifications as may be reasonably necessary to maintain the effectiveness thereof during the Registration Period, (iii) take such other actions as may be reasonably necessary to maintain such registrations and qualifications in effect at all times during the Registration Period, and (iv) take all other actions reasonably necessary or advisable to qualify the Registrable Securities for sale in such jurisdictions;provided, however, that the Company shall not be required in connection therewith or as a condition thereto to (x) qualify to do business in any jurisdiction where it would not otherwise be required to qualify but for this Section 3(d), (y) subject itself to general taxation in any such jurisdiction, or (z) file a general consent to service of process in any such jurisdiction.

e. As promptly as practicable after becoming aware of such event, the Company shall notify each Investor that holds Registrable Securities of the happening of any event, of which the Company has knowledge, as a result of which the prospectus included in any Registration Statement, as then in effect, includes an untrue statement of a material fact or omits to state a material fact required to be stated therein or necessary to make the statements therein not misleading, and promptly prepare a supplement or amendment to any Registration Statement to correct such untrue statement or omission, and deliver such number of copies of such supplement or amendment to each Investor as such Investor may reasonably request.

f. The Company shall use its reasonable best efforts to prevent the issuance of any stop order or other suspension of effectiveness of any Registration Statement, and, if such an order is issued, to obtain the withdrawal of such order at the earliest possible moment and to notify each Investor that holds Registrable Securities (and, in the event of an underwritten offering, the managing underwriters) of the issuance of such order and the resolution thereof.

g. The Company shall permit a single firm of counsel designated by the Investors (“Legal Counsel”) to review such Registration Statement and all amendments and supplements thereto (as well as all requests for acceleration or effectiveness thereof), a reasonable period of time prior to their filing with the SEC (not less than five (5) business days but not more than eight (8) business days) and not file any documents in a form to which Legal Counsel reasonably objects and will not request acceleration of such Registration Statement without prior notice to Legal Counsel.

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h. The Company shall hold in confidence and not make any disclosure of information concerning an Investor provided to the Company unless (i) disclosure of such information is necessary to comply with federal or state securities laws, (ii) the disclosure of such information is necessary to avoid or correct a misstatement or omission in any Registration Statement, (iii) the release of such information is ordered pursuant to a subpoena or other order from a court or governmental body of competent jurisdiction, or (iv) such information has been made generally available to the public other than by disclosure in violation of this or any other agreement. The Company agrees that it shall, upon learning that disclosure of such information concerning any Investor is sought in or by a court or governmental body of competent jurisdiction or through other means, give prompt notice to such Investor prior to making such disclosure, and allow such Investor, at its expense, to undertake appropriate action to prevent disclosure of, or to obtain a protective order for, such information.

i. The Company shall use its best efforts to cause all the Registrable Securities covered by each Registration Statement to be listed on each securities exchange on which securities of the same class or series issued by the Company are then listed, if any, if the listing of such Registrable Securities is then permitted under the rules of such exchange, and, to arrange for at least two market makers to register with FINRA as such with respect to such Registrable Securities.

j. The Company shall provide a transfer agent and registrar, which may be a single entity, for the Registrable Securities not later than the effective date of the initial Registration Statement.

k. The Company shall cooperate with each Investor that holds Registrable Securities being offered and the managing underwriter or underwriters with respect to an applicable Registration Statement, if any, to facilitate the timely (i) preparation and delivery of certificates (not bearing any restrictive legends) representing Registrable Securities to be offered pursuant to such Registration Statement, and enable such certificates to be registered in such names and in such denominations or amounts, as the case may be, or (ii) crediting of the Registrable Securities to be offered pursuant to a Registration Statement to the applicable account (or accounts) with The Depository Trust Company through its Deposit/Withdrawal At Custodian (DWAC) system, in any such case as such Investor or the managing underwriter or underwriters, if any, may reasonably request. Within three (3) business days after a Registration Statement which includes Registrable Securities becomes effective, the Company shall deliver, and shall cause legal counsel selected by the Company to deliver, to the transfer agent for the Registrable Securities (with copies to each Investor) an appropriate instruction and an opinion of such counsel in the form required by the transfer agent in order to issue the Registrable Securities free of restrictive legends.

l. At the reasonable request of an Investor, the Company shall prepare and file with the SEC such amendments (including post-effective amendments) and supplements to a Registration Statement and any prospectus used in connection with the Registration Statement as may be necessary in order to change the plan of distribution set forth in such Registration Statement.

m. The Company shall not, and shall not agree to, allow the holders of any securities of

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the Company to include any of their securities (other than Registrable Securities) in any Registration Statement filed pursuant to Section 2(a) hereof or any amendment or supplement thereto under Section 3(b) hereof without the consent of Investors holding amajority-in-interest of the then outstanding Registrable Securities. In addition, the Company shall not include any securities for its own account or the account of others in any Registration Statement filed pursuant to Section 2(a) hereof or any amendment or supplement thereto filed pursuant to Section 3(b) hereof without the consent of Investors holding amajority-in-interest of the then outstanding Registrable Securities.

n. Reserved.

o. The Company shall comply with all applicable laws related to a Registration Statement and offering and sale of securities and all applicable rules and regulations of governmental authorities in connection therewith (including the Securities Act and the Exchange Act and the rules and regulations promulgated by the SEC).

p. If required by the FINRA Corporate Financing Department, the Company shall promptly effect a filing with FINRA pursuant to FINRA Rule 5110 (or successor thereto) with respect to the public offering contemplated by resales of securities under the Registration Statement (an “Issuer Filing”), and pay the filing fee required by such Issuer Filing. The Company shall use its best efforts to pursue the Issuer Filing until FINRA issues a letter confirming that it does not object to the terms of the offering contemplated by the Registration Statement.

q. If at any time the SEC advises the Company in writing that the offering of some or all of the Registrable Securities in a Registration Statement is not eligible to be made on a delayed or continuous basis under the provisions of Rule 415, the Company shall use its reasonable best efforts to persuade the SEC that the offering contemplated by a Registration Statement is a bona fide secondary offering and not an offering “by or on behalf of the issuer” as defined in Rule 415 and that none of the Investors is an “underwriter.” The Investors shall have the right to participate or have their respective counsel participate in any meetings or discussions with the SEC regarding the SEC’s position and to comment or have their respective counsel comment on any written submission made to the SEC with respect thereto. No such written submission shall be made to the SEC to which any Investor’s counsel reasonably objects. In the event that, despite the Company’s reasonable best efforts and compliance with the terms of this Section 3(q), the SEC refuses to alter its position, the Company shall remove from the Registration Statement such portion of the Registrable Securities as the SEC requires in writing be removed therefrom. Any suchcut-back imposed by the SEC as contemplated by this Section 3(q) shall be imposed on a pro rata basis (based upon the Registrable Securities held by each of the Investors), first, to the Registrable Securities that are not Conversion Shares until all of such Registrable Securities are removed from the Registration Statement, and only then to the Conversion Shares, unless otherwise required by the SEC.

r. Notwithstanding anything to the contrary inSection 3(e), at any time after the effective date of the applicable Registration Statement, the Company may delay the disclosure of material non-public information concerning the Company the disclosure of which at the time is not, in the good faith opinion of the Board of Directors of the Company and its counsel, in the best

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interest of the Company and is not, in the opinion of counsel to the Company, otherwise required (a “Grace Period”);provided, that the Company shall (i) promptly notify the Investors in writing of the existence of materialnon-public information giving rise to a Grace Period (provided that in each notice the Company shall not disclose the content of such materialnon-public information to any Investor unless otherwise requested in writing by such Investor) and the date on which the Grace Period will begin, and (ii) as soon as such date may be determined, promptly notify the Investors in writing of the date on which the Grace Period ends; and,provided, further, that (A) no Grace Period shall exceed forty five (45) consecutive days, (B) during any three hundred sixty five (365) day period, such Grace Periods shall not exceed an aggregate of seventy five (75) days, and (C) the first day of any Grace Period must be at least ten (10) business days after the last day of any prior Grace Period (each Grace Period that satisfies all of the requirements of thisSection 3(r)being referred to as an “Allowable Grace Period”). For purposes of determining the length of a Grace Period above, the Grace Period shall begin on and include the date the Investors receive the notice referred to in clause (i) and shall end on and include the later of the date the Investors receive the notice referred to in clause (ii) and the date referred to in such notice. The provisions ofSection 3(e)hereof shall not be applicable during the period of any Allowable Grace Period, damages shall not accrue on any day during an Allowable Grace Period, and the unavailability of a Registration Statement for resales of the Registrable Securities on any day during an Allowable Grace Period shall not constitute a “Registration Failure” (as defined in the Convertible Notes). Upon expiration of the Grace Period, the Company shall again be bound by the first sentence ofSection 3(e)with respect to the information giving rise thereto unless such materialnon-public information is no longer applicable.

4.OBLIGATIONS OF THE INVESTOR.In connection with the registration of the Registrable Securities, each Investor shall have the following obligations:

a. It shall be a condition precedent to the obligations of the Company to complete the registration pursuant to this Agreement with respect to the Registrable Securities of an Investor that such Investor shall furnish to the Company such information regarding itself, the Registrable Securities held by it and the intended method of disposition of the Registrable Securities held by it as shall be reasonably required to effect the registration of such Registrable Securities and shall execute such documents in connection with such registration as the Company may reasonably request. At least five (5) business days prior to the first anticipated filing date of a Registration Statement, the Company shall notify each Investor of the information the Company requires from such Investor. Any such information shall not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein, or necessary to make the statements therein not misleading. An Investor must provide such information to the Company at least two (2) business days prior to the first anticipated filing date of such Registration Statement if such Investor elects to have any Registrable Securities included in the Registration Statement.

b. Each Investor, by such Investor’s acceptance of the Registrable Securities, agrees to cooperate with the Company as reasonably requested by the Company in connection with the preparation and filing of a Registration Statement hereunder, unless such Investor has notified the Company in writing of such Investor’s election to exclude all of the Investor’s Registrable Securities from

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such Registration Statement.

c. In the event of an underwritten offering pursuant to Section 2(b) in which any Registrable Securities of any Investor are to be included, such Investor agrees to enter into and perform the Investor’s obligations under an underwriting agreement, in usual and customary form, including customary indemnification and contribution obligations (as applicable to selling security holders generally), with the managing underwriter of such offering and take such other actions as are reasonably required in order to expedite or facilitate the disposition of such Investor Registrable Securities.

d. Each Investor agrees that, upon receipt of any notice from the Company of the happening of any event of the kind described in Section 3(e) or 3(f), such Investor will immediately discontinue disposition of Registrable Securities pursuant to the Registration Statement covering such Registrable Securities until such Investor’s receipt of the copies of the supplemented or amended prospectus contemplated by Section 3(e) or 3(f).

e. Each Investor agrees that it will promptly notify the Company of any material changes in the information set forth in a Registration Statement furnished by or regarding such Investor, other than changes in the number of shares beneficially owned.

5.REGISTRATION FAILURE.In the event of a Registration Failure (as defined in the Convertible Notes), the Investors shall be entitled to damages and such other rights as set forth in the Convertible Notes and, subject to any applicable cure periods, all payments and remedies provided under the Facility Agreement upon the occurrence of an Event of Default.

6.EXPENSES OF REGISTRATION.All reasonable expenses, other than underwriting discounts and commissions, incurred in connection with registrations, filings or qualifications pursuant to Sections 2 and 3, including, without limitation, all registration, listing and qualification fees, printers and accounting fees, and the fees and disbursements of counsel for the Company shall be borne by the Company. The Company shall also reimburse the Investors for the reasonable fees and disbursements of Legal Counsel in the aggregate amount up to $25,000 per registration in connection with registrations pursuant to Section 2 or 3 of this Agreement.

7.INDEMNIFICATION.In the event any Registrable Securities are included in a Registration Statement under this Agreement:

a. The Company will indemnify, hold harmless and defend (i) each Investor, (ii) the directors, officers, partners, managers, members, employees, agents of each Investor, and each Person who controls any Investor within the meaning of the Securities Act or the Exchange Act, if any, (iii) any underwriter (as defined in the Securities Act) for each Investor in connection with an underwritten offering pursuant to Section 2(b) hereof, and (iv) the directors, officers, partners, employees and each Person who controls any such underwriter within the meaning of the Securities Act or the Exchange Act, if any (each, an “Indemnified Person”), against any joint or several losses, claims, damages, liabilities or expenses (collectively, together with actions, proceedings or inquiries by any regulatory or self-regulatory organization, whether

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commenced or threatened, in respect thereof, “Claims”) to which any of them may become subject insofar as such Claims arise out of or are based upon: (i) any untrue statement or alleged untrue statement of a material fact in any Registration Statement, or any amendment or supplement thereto, or any filing made under state securities laws as required hereby, or the omission or alleged omission to state therein a material fact required to be stated or necessary to make the statements therein not misleading; (ii) any untrue statement or alleged untrue statement of a material fact contained in any Prospectus, or any amendment or supplement thereto, or the omission or alleged omission to state therein any material fact necessary to make the statements made therein, in the light of the circumstances under which the statements therein were made, not misleading; or (iii) any violation or alleged violation by the Company of the Securities Act, the Exchange Act, any other law, including any state securities law, or any rule or regulation thereunder relating to the offer or sale of the Registrable Securities (the matters in the foregoing clauses (i) through (iii) being, collectively, “Violations”). The Company shall reimburse the Indemnified Person, promptly as such expenses are incurred and are due and payable, for any reasonable legal fees and other reasonable expenses incurred by them in connection with investigating or defending any such Claim. Notwithstanding anything to the contrary contained herein, the indemnification agreement contained in this Section 7(a) shall not apply to a Claim arising out of or based upon a Violation to the extent that such Violation occurs in reliance upon and in conformity with information furnished in writing to the Company by or on behalf of any Indemnified Person expressly for use in connection with the preparation of such Registration Statement or any such amendment thereof or supplement thereto, or (B) to any amounts paid in settlement of any Claim effected without the prior written consent of the Company, which consent shall not be unreasonably withheld or delayed. Such indemnity shall remain in full force and effect regardless of any investigation made by or on behalf of the Indemnified Person and shall survive the transfer of the Registrable Securities by any of the Investors pursuant to Section 10.

b. Promptly after receipt by an Indemnified Person under this Section 7 of notice of the commencement of any action (including any governmental action), such Indemnified Person shall, if a Claim in respect thereof is to be made against the Company under this Section 7, deliver to the Company a written notice of the commencement thereof, and the Company shall have the right to participate in, and, to the extent the Company so desires, to assume control of the defense thereof with counsel mutually satisfactory to the Company and the Indemnified Person, as the case may be;

provided, however, that an Indemnified Person shall have the right to retain its own counsel with the reasonable fees and expenses to be paid by the Company, if, in the reasonable opinion of counsel for such Indemnified Person, the representation by such counsel of the Indemnified Person and the Company would be inappropriate due to actual or potential differing interests between such Indemnified Person and any other party represented by such counsel in such proceeding. The Company shall pay for only one separate legal counsel for the Indemnified Persons, and such legal counsel shall be selected by the Investors. The failure to deliver written notice to the Company within a reasonable time of the commencement of any such action shall not relieve the Company of any liability to the Indemnified Person under this Section 7, except to the extent that the Company is actually prejudiced in its ability to defend such action, and shall not relieve the Company of any

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liability to the Indemnified Person otherwise than pursuant to this Section 7. The Company shall not, without the prior written consent of the Indemnified Persons, consent to entry of any judgment or enter into any settlement or other compromise with respect to any Claim in respect of which indemnification or contribution may be or has been sought hereunder (whether or not any such Indemnified Party is an actual or potential party to such action or claim) which does not include as an unconditional term thereof the giving by the claimant or plaintiff to the Indemnified Persons of a full release from all liability with respect to such Claim or which includes any admission as to fault or culpability on the part of any Indemnified Person. The indemnification required by this Section 7 shall be made by periodic payments of the amount thereof during the course of the investigation or defense, as any expense, loss, damage or liability is incurred.

c. Each Investor will indemnify, hold harmless and defend (i) the Company, and (ii) the directors, officers, partners, managers, members, employees, or agents of the Company, if any (each, a “Company Indemnified Person”), against any Claims to which any of them may become subject insofar as such Claims arise out of or are based upon any violation or alleged violation by the Company of the Securities Act, the Exchange Act, any other law, including any state securities law, or any rule or regulation thereunder relating to the offer or sale of the Registrable Securities, which occurs due to the inclusion by the Company in a Registration Statement of false or misleading information about an Investor, where such information was furnished in writing to the Company by or on behalf of such Investor expressly for the purpose of inclusion in such Registration Statement. Notwithstanding anything herein to the contrary, the indemnity agreement contained in this Section 7(c) shall not apply to amounts paid in settlement of any Claim if such settlement is effected without the prior written consent of the Investors, which consent shall not be unreasonably withheld or delayed; and provided, further, however, that an Investor shall be liable under this Section 7(c) for only that amount of a Claim as does not exceed the net amount of proceeds received by such Investor as a result of the sale of Registrable Securities pursuant to such Registration Statement.

d. Promptly after receipt by a Company Indemnified Person under this Section 7 of notice of the commencement of any action (including any governmental action), such Company Indemnified Person shall, if a Claim in respect thereof is to be made against any Investor under this Section 7, deliver to such Investor a written notice of the commencement thereof, and such Investor shall have the right to participate in, and, to the extent such Investor so desires, to assume control of the defense thereof with counsel mutually satisfactory to such Investor and such Company Indemnified Person.

8.CONTRIBUTION.If for any reason the indemnification provided for in Section 7(a) or 7(c) (as applicable) is unavailable to an Indemnified Person or Company Indemnified Person (as applicable) or insufficient to hold it harmless, other than as expressly specified therein, then the indemnifying party shall contribute to the amount paid or payable by the Indemnified Person or Company Indemnified Person (as applicable) as a result of the Claim in such proportion as is appropriate to reflect the relative fault of the Indemnified Person or Company Indemnified Person (as applicable) and the indemnifying party (provided that the relative fault of any Company Indemnified Person shall be deemed to include the fault of all other Company Indemnified Persons), as well as any other relevant equitable considerations.

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No Person guilty of fraudulent misrepresentation within the meaning of Section 11(f) of the Securities Act shall be entitled to contribution from any Person not guilty of such fraudulent misrepresentation. In no event shall the contribution obligation of an Investor be greater in amount than the net amount of proceeds received by such Investor as a result of the sale of Registrable Securities giving rise to such contribution obligation pursuant to the applicable Registration Statement (net of the aggregate amount of any damages or other amounts such Investor has otherwise been required to pay (pursuant to Section 7(c) or otherwise) by reason of such Investor’s untrue or alleged untrue statement or omission or alleged omission).

9.REPORTS UNDER THE 1934 ACT.With a view to making available to the Investors the benefits of Rule 144 promulgated under the Securities Act or any other similar rule or regulation of the SEC that may at any time permit the Investors to sell securities of the Company to the public without registration, the Company agrees to:

a. make and keep public information available, as those terms are understood and defined in Rule 144;

b. file with the SEC in a timely manner all reports and other documents required of the Company under the Exchange Act so long as the Company remains subject to such requirements and the filing of such reports and other documents is required for the applicable provisions of Rule 144; and

c. so long as any of the Investors owns Registrable Securities, promptly upon request, furnish to such Investor (i) a written statement by the Company that it has complied with the reporting requirements of the Exchange Act as required for applicable provisions of Rule 144, (ii) a copy of the most recent annual or quarterly report of the Company and such other reports and documents so filed by the Company and (iii) such other information as may be reasonably requested to permit such Investor to sell such Registrable Securities pursuant to Rule 144 without registration.

10.ASSIGNMENT OF REGISTRATION RIGHTS.The rights under this Agreement shall be automatically assignable by each Investor to any transferee of all or any portion of the Registrable Securities if: (i) such Investor agrees in writing with the transferee or assignee to assign such rights, and a copy of such agreement is furnished to the Company within a reasonable time after such assignment, (ii) the Company is, within a reasonable time after such transfer or assignment, furnished with written notice of (a) the name and address of such transferee or assignee, and (b) the securities with respect to which such registration rights are being transferred or assigned, and (iii) at or before the time the Company receives the written notice contemplated in clause (ii) of this sentence, the transferee or assignee agrees in writing with the Company to be bound by all of the provisions contained herein as applicable to the Investors. In the event that the Company receives written notice from an Investor that it has transferred all or any portion of its Registrable Securities pursuant to this Section, the Company shall have up to ten (10) days to file any amendments or supplements necessary to keep a Registration Statement current and effective pursuant to Rule 415, and the commencement date of any Registration Failure (as defined in the Convertible Notes) or Event of Default (as defined in the Convertible Notes) under the Convertible Notes caused thereby will be extended by ten (10) days. Each Investor shall at all times comply with the

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restrictions on transfer set forth in Section 13 of the Convertible Notes (to the extent applicable to such Investor), which provisions are hereby incorporated by reference and made a part hereof.

11.AMENDMENT OF REGISTRATION RIGHTS.Provisions of this Agreement may be amended and the observance thereof may be waived (either generally or in a particular instance and either retroactively or prospectively), only with written consent of the Company and the holders of a majority in interest of then-outstanding Registrable Securities. Any amendment or waiver effected in accordance with this Section 11 shall be binding upon each of the Investors and the Company.

12. MISCELLANEOUS.

a. A Person is deemed to hold, and be a holder of, shares of Common Stock or other Registrable Securities whenever such Person owns of record or beneficially through a “street name” holder such shares of Common Stock or other Registrable Securities (or the Convertible Notes or other securities upon exercise, conversion or exchange of which such Registrable Securities are directly or indirectly issuable, without giving effect to any limitations on exercise, conversion or exchange of the Convertible Notes or other securities), and solely for purposes hereof, Registrable Securities shall be deemed outstanding to the extent they are directly or indirectly issuable upon exercise, conversion or exchange of the Convertible Notes or other outstanding securities, without giving effect to any limits on exercise, conversion or exchange of the Convertible Notes or other securities. If the Company receives conflicting instructions, notices or elections from two or more Persons with respect to the same Registrable Securities, the Company shall act upon the basis of instructions, notice or election received from the registered owner of such Registrable Securities (or the Convertible Notes or other securities upon exercise, conversion or exchange of which such Registrable Securities are directly or indirectly issuable).

b. Any notices required or permitted to be given under the terms hereof shall be sent by certified or registered mail (return receipt requested) or delivered personally or by courier (including a recognized overnight delivery service) or by electronic mail and shall be effective five days after being placed in the mail, if mailed by regular United States mail, or upon receipt, if delivered personally or by courier (including a recognized overnight delivery service) or by electronic mail, in each case addressed to a party. The addresses for such communications shall be:

If to the Company:

Sientra, Inc.

420 South Fairview Avenue, Suite 200

Santa Barbara, CA 93117

Email: oliver.bennett@sientra.com

Attn: Oliver Bennett, Esq.

With copy to:

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DLA Piper LLP (US)

4365 Executive Dr., Suite 1100

San Diego, CA 92121

Email: michael.kagnoff@dlapiper.com

Attn: Michael Kagnoff, Esq.

If to an Investor:

c/o Deerfield Management Company, L.P.

780 Third Avenue, 37^th Floor

New York, NY 10017

E-mail: dclark@deerfield.com

Attn: David J. Clark, Esq.

With a copy to:

Sullivan & Cromwell LLP

125 Broad Street

New York, NY 10004-2498

Email: blauta@sullcrom.com

Attn: Ari B. Blaut, Esq.

Each party shall provide notice to the other party of any change in address.

c. Failure of any party to exercise any right or remedy under this Agreement or otherwise, or delay by a party in exercising such right or remedy, shall not operate as a waiver thereof.

d. Governing Law. All questions concerning the construction, validity, enforcement and interpretation of this Agreement shall be governed by and construed and enforced in accordance with the internal laws of the State of New York, without regard to the principles of conflicts of law thereof. Each party agrees that all legal proceedings concerning the interpretations, enforcement and defense of the transactions contemplated by this Agreement (whether brought against a party hereto or its respective affiliates, directors, officers, shareholders, employees or agents) shall be commenced exclusively in the state and federal courts sitting in the City of New York, borough of Manhattan. Each party hereby irrevocably submits to the exclusive jurisdiction of the state and federal courts sitting in the City of New York, Borough of Manhattan for the adjudication of any dispute hereunder or in connection herewith or with any transaction contemplated hereby or discussed herein, and hereby irrevocably waives, and agrees not to assert in any suit, action or proceeding, any claim that it is not personally subject to the jurisdiction of any such court, that such suit, action or proceeding is improper or is an inconvenient venue for such proceeding. Each party hereby irrevocably waives personal service of process and consents to process being served in any such suit, action or proceeding by mailing a copy thereof via registered or certified mail or overnight delivery (with evidence of delivery) to such party at the address in effect for notices to it under this Agreement and agrees that such service shall constitute good and sufficient service of process and notice thereof. Nothing contained herein shall be deemed to limit in any way any right to serve process in any other manner permitted by law. The parties hereby waive all rights to a trial by jury. If either party

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shall commence an action or proceeding to enforce any provision of this Agreement, then the prevailing party in such action or proceeding shall be reimbursed by the other party for its reasonable attorneys’ fees and other costs and expenses incurred with the investigation, preparation and prosecution of such action or proceeding.

e. This Agreement, the Convertible Notes and the Facility Agreement (including all schedules and exhibits thereto) constitute the entire agreement among the parties hereto with respect to the subject matter hereof. This Agreement, the Convertible Notes and the Facility Agreement (including all schedules and exhibits thereto) supersede all prior agreements and understandings among the parties hereto with respect to the subject matter hereof.

f. Subject to the requirements of Section 10 hereof, this Agreement shall inure to the benefit of and be binding upon the successors and assigns of each of the parties hereto, and the provisions of Sections 7 and 8 hereof shall inure to the benefit of, and be enforceable by, each Indemnified Person and Company Indemnified Person (as applicable).

g. The headings in this Agreement are for convenience of reference only and shall not limit or otherwise affect the meaning hereof.

h. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original but all of which shall constitute one and the same agreement. This Agreement, once executed by a party, may be delivered to the other party hereto by electronic transmission of a copy of this Agreement bearing the signature of the party so delivering this Agreement.

i. Each party shall do and perform, or cause to be done and performed, all such further acts and things, and shall execute and deliver all such other agreements, certificates, instruments and documents, as the other parties may reasonably request in order to carry out the intent and accomplish the purposes of this Agreement and the consummation of the transactions contemplated hereby.

j. The Company acknowledges that a breach by it of its obligations hereunder will cause irreparable harm to the Investors by vitiating the intent and purpose of the transactions contemplated hereby. Accordingly, the Company acknowledges that the remedy at law for breach of its obligations hereunder will be inadequate and agrees, in the event of a breach or threatened breach by the Company of any of the provisions hereunder, that the Investors shall be entitled, in addition to all other available remedies in law or in equity, to an injunction or injunctions to prevent or cure breaches of the provisions of this Agreement and to enforce specifically the terms and provisions hereof, without the necessity of showing economic loss and without any bond or other security being required.

k. The language used in this Agreement will be deemed to be the language chosen by the parties to express their mutual intent, and no rules of strict construction will be applied against any party.

l. In the event that any provision of this Agreement is invalid or unenforceable under any applicable statute or rule of law, then such provision shall be deemed inoperative to the extent that it may conflict therewith and shall be deemed modified to conform with such statute

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or rule of law. Any provision hereof which may prove invalid or unenforceable under any law shall not affect the validity or enforceability of any other provision hereof.

m. In the event an Investor shall sell or otherwise transfer any of such holder’s Registrable Securities, each transferee shall be allocated a pro rata portion of the number of Registrable Securities included in a Registration Statement for such transferor.

n. There shall be no oral modifications or amendments to this Agreement. This Agreement may be modified or amended only in writing.

o. The Company shall not grant any Person any registration rights with respect to shares of Common Stock or any other securities of the Company other than registration rights that will not adversely affect the rights of the Investors hereunder (including by limiting in any way the number of Registrable Securities that could be included in any Registration Statement pursuant to Rule 415) and shall not otherwise enter into any agreement that is inconsistent with the rights granted to the Investors hereunder.

p. The obligations of each Investor hereunder are several and not joint with the obligations of any other Investor, and no provision of this Agreement is intended to confer any obligations on any Investorvis-à-vis any other Investor. Nothing contained herein, and no action taken by any Investor pursuant hereto, shall be deemed to constitute the Investors as a partnership, an association, a joint venture or any other kind of entity, or create a presumption that the Investors are in any way acting in concert or as a group with respect to such obligations or the transactions contemplated herein.

q. Unless the context otherwise requires, (i) all references to Sections, Schedules or Exhibits are to Sections, Schedules or Exhibits contained in or attached to this Agreement, (ii) words in the singular or plural include the singular and plural, and pronouns stated in either the masculine, the feminine or neuter gender shall include the masculine, feminine and neuter, and (ii) the use of the word “including” in this Agreement shall be by way of example rather than limitation.

[Remainder of page left intentionally blank]

[Signature page follows]

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IN WITNESS WHEREOF, the undersigned Investors and the Company have caused this Registration Rights Agreement to be duly executed as of the date first written above.


BORROWER:

SIENTRA, INC., a Delaware corporation

By:		/s/Paul Little
		Name: Paul Little
		Title: CFO

[Signature Page to Registration Rights Agreement]

IN WITNESS WHEREOF, the undersigned Investors and the Company have caused this Registration Rights Agreement to be duly executed as of the date first written above.


INVESTOR:

DEERFIELD PARTNERS, L.P.

	By:	Deerfield Mgmt, L.P.,
		its General Partner

		By:	J.E. Flynn Capital, LLC,
			its General Partner

			By:	/s/David J. Clark
				Name: David J. Clark
				Title: Authorized Signatory

[Signature Page to Registration Rights Agreement]

Sientra (SIENQ) 8-KSientra Announces $60 Million Convertible Notes Investment from