Unassociated Document

CUSIP No.

00771V108

13G

Page 2 of 16

1.	NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Deerfield Mgmt, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*		(a) o (b) ý
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5.	SOLE VOTING POWER 0
	6.	SHARED VOTING POWER 3,270,208 (1)
	7.	SOLE DISPOSITIVE POWER 0
	8.	SHARED DISPOSITIVE POWER 3,270,208 (1)
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,270,208 (1)
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*		o
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.98%
12.	TYPE OF REPORTING PERSON* PN

__________________

(1) Comprised of an aggregate of 1,858,917 shares of common stock and 1,411,291 shares of common stock underlying convertible notes held by Deerfield Partners, L.P., Deerfield International Master Fund, L.P., Deerfield Special Situations Fund, L.P. and Deerfield Special Situations International Master Fund, L.P., of which Deerfield Mgmt, L.P. is the general partner. The provisions of the convertible notes beneficially owned by the reporting person restrict the conversion of such securities to the extent that, upon such exercise or conversion, the number of shares then beneficially owned by the holder and any other person or entities with which such holder would constitute a Section 13(d) “group” would exceed 9.98% of the total number of shares of the Issuer then outstanding (the “Ownership Cap”). Accordingly, notwithstanding the number of shares reported, the reporting person disclaims beneficial ownership of the shares underlying such convertible notes to the extent beneficial ownership of such shares would cause all reporting persons hereunder, in the aggregate, to exceed the Ownership Cap.

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00771V108

13G

Page 3 of 16

1.	NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Deerfield Management Company, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*		(a) o (b) ý
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5.	SOLE VOTING POWER 0
	6.	SHARED VOTING POWER 6,899,240 (2)
	7.	SOLE DISPOSITIVE POWER 0
	8.	SHARED DISPOSITIVE POWER 6,899,240 (2)
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,899,240 (2)
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*		o
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.98%
12.	TYPE OF REPORTING PERSON* PN

__________________

(2) Comprised of an aggregate of 1,858,917 shares of common stock and 5,040,323 shares of common stock underlying convertible notes held by Deerfield Partners, L.P., Deerfield International Master Fund, L.P., Deerfield Special Situations Fund, L.P., Deerfield Special Situations International Master Fund, L.P. and Deerfield Private Design Fund III, L.P., of which Deerfield Management Company, L.P. is the investment advisor. The provisions of the convertible notes beneficially owned by the reporting person restrict the conversion of such securities to the extent that, upon such exercise or conversion, the number of shares then beneficially owned by the holder and any other person or entities with which such holder would constitute a Section 13(d) “group” would exceed 9.98% of the total number of shares of the Issuer then outstanding (the “Ownership Cap”). Accordingly, notwithstanding the number of shares reported, the reporting person disclaims beneficial ownership of the shares underlying such convertible notes to the extent beneficial ownership of such shares would cause all reporting persons hereunder, in the aggregate, to exceed the Ownership Cap.

CUSIP No.

00771V108

13G

Page 4 of 16

1.	NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Deerfield Partners, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*		(a) o (b) ý
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5.	SOLE VOTING POWER 0
	6.	SHARED VOTING POWER 1,212,778 (3)
	7.	SOLE DISPOSITIVE POWER 0
	8.	SHARED DISPOSITIVE POWER 1,212,778 (3)
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,212,778 (3)
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*		o
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 4.96%
12.	TYPE OF REPORTING PERSON* PN

(3) Comprised of an aggregate of 765,197 shares of common stock and 447,581 shares of common stock underlying convertible notes.

CUSIP No.

00771V108

13G

Page 5 of 16

1.	NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Deerfield Special Situations Fund, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*		(a) o (b) ý
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5.	SOLE VOTING POWER 0
	6.	SHARED VOTING POWER 301,825 (4)
	7.	SOLE DISPOSITIVE POWER 0
	8.	SHARED DISPOSITIVE POWER 301,825 (4)
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 301,825 (4)
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*		o
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.25%
12.	TYPE OF REPORTING PERSON* PN

(4) Comprised of an aggregate of 81,664 shares of common stock and 220,161 shares of common stock underlying convertible notes.

CUSIP No.

00771V108

13G

Page 6 of 16

1.	NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Deerfield International Master Fund, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*		(a) o (b) ý
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION British Virgin Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5.	SOLE VOTING POWER 0
	6.	SHARED VOTING POWER 1,506,304 (5)
	7.	SOLE DISPOSITIVE POWER 0
	8.	SHARED DISPOSITIVE POWER 1,506,304 (5)
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,506,304 (5)
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*		o
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 6.14%
12.	TYPE OF REPORTING PERSON* PN

(5) Comprised of an aggregate of 945,820 shares of common stock and 560,484 shares of common stock underlying convertible notes.

CUSIP No.

00771V108

13G

Page 7 of 16

1.	NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Deerfield Special Situations International Master Fund, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*		(a) o (b) ý
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION British Virgin Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5.	SOLE VOTING POWER 0
	6.	SHARED VOTING POWER 249,301 (6)
	7.	SOLE DISPOSITIVE POWER 0
	8.	SHARED DISPOSITIVE POWER 249,301 (6)
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 249,301 (6)
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*		o
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.03%
12.	TYPE OF REPORTING PERSON* PN

(6) Comprised of an aggregate of 66,236 shares of common stock and 183,065 shares of common stock underlying convertible notes

CUSIP No.

00771V108

13G

Page 8 of 16

1.	NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Deerfield Mgmt III, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*		(a) o (b) ý
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5.	SOLE VOTING POWER 0
	6.	SHARED VOTING POWER 3,629,032 (7)
	7.	SOLE DISPOSITIVE POWER 0
	8.	SHARED DISPOSITIVE POWER 3,629,032 (7)
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,629,032 (7)
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*		o
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.98%
12.	TYPE OF REPORTING PERSON* PN

_______________

(7) Comprised of 3,629,032 shares of common stock underlying convertible notes held by Deerfield Private Design Fund III, L.P., of which Deerfield Mgmt III, L.P. is the general partner. The provisions of the convertible notes beneficially owned by the reporting person restrict the conversion of such securities to the extent that, upon such exercise or conversion, the number of shares then beneficially owned by the holder and any other person or entities with which such holder would constitute a Section 13(d) “group” would exceed 9.98% of the total number of shares of the Issuer then outstanding (the “Ownership Cap”). Accordingly, notwithstanding the number of shares reported, the reporting person disclaims beneficial ownership of the shares underlying such convertible notes to the extent beneficial ownership of such shares would cause all reporting persons hereunder, in the aggregate, to exceed the Ownership Cap.

CUSIP No.

00771V108

13G

Page 9 of 16

1.	NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Deerfield Private Design Fund III, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*		(a) o (b) ý
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5.	SOLE VOTING POWER 0
	6.	SHARED VOTING POWER 3,629,032 (8)
	7.	SOLE DISPOSITIVE POWER 0
	8.	SHARED DISPOSITIVE POWER 3,629,032 (8)
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,629,032 (8)
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*		o
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.98%
12.	TYPE OF REPORTING PERSON* PN

(8) Comprised of 3,629,032 shares of common stock underlying convertible notes held by Deerfield Private Design Fund III, L.P., of which Deerfield Mgmt III, L.P. is the general partner. The provisions of the convertible notes beneficially owned by the reporting person restrict the conversion of such securities to the extent that, upon such exercise or conversion, the number of shares then beneficially owned by the holder and any other person or entities with which such holder would constitute a Section 13(d) “group” would exceed 9.98% of the total number of shares of the Issuer then outstanding (the “Ownership Cap”). Accordingly, notwithstanding the number of shares reported, the reporting person disclaims beneficial ownership of the shares underlying such convertible notes to the extent beneficial ownership of such shares would cause all reporting persons hereunder, in the aggregate, to exceed the Ownership Cap.

CUSIP No.

00771V108

13G

Page 10 of 16

1.	NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) James E. Flynn
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*		(a) o (b) ý
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5.	SOLE VOTING POWER 0
	6.	SHARED VOTING POWER 6,899,240 (9)
	7.	SOLE DISPOSITIVE POWER 0
	8.	SHARED DISPOSITIVE POWER 6,899,240 (9)
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,899,240 (9)
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*		o
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.98%
12.	TYPE OF REPORTING PERSON* IN

__________________

(9) Comprised of an aggregate of 1,858,917 shares of common stock and 5,040,323 shares of common stock underlying convertible notes held by Deerfield Partners, L.P., Deerfield International Master Fund, L.P., Deerfield Special Situations Fund, L.P., Deerfield Special Situations International Master Fund, L.P. and Deerfield Private Design Fund III, L.P. The provisions of the convertible notes beneficially owned by the reporting person restrict the conversion of such securities to the extent that, upon such exercise or conversion, the number of shares then beneficially owned by the holder and any other person or entities with which such holder would constitute a Section 13(d) “group” would exceed 9.98% of the total number of shares of the Issuer then outstanding (the “Ownership Cap”). Accordingly, notwithstanding the number of shares reported, the reporting person disclaims beneficial ownership of the shares underlying such convertible notes to the extent beneficial ownership of such shares would cause all reporting persons hereunder, in the aggregate, to exceed the Ownership Cap.

CUSIP No.

00771V108

13G

Page 11 of 16


Item 1(a).		Name of Issuer:

		Aerie Pharmaceuticals, Inc.

Item 1(b).		Address of Issuer's Principal Executive Offices:

		135 US Highway 206, Suite 15 Bedminster, NJ 07921

Item 2(a).		Name of Person Filing:

		James E. Flynn, Deerfield Mgmt, L.P., Deerfield Partners, L.P., Deerfield Mgmt III, L.P., Deerfield Special Situations Fund, L.P., Deerfield Management Company, L.P., Deerfield International Master Fund, L.P., Deerfield Special Situations International Master Fund, L.P. and Deerfield Private Design Fund III, L.P.

Item 2(b).		Address of Principal Business Office, or if None, Residence:

		James E. Flynn, Deerfield Mgmt, L.P., Deerfield Mgmt III, L.P., Deerfield Partners, L.P., Deerfield Special Situations Fund, L.P., Deerfield Management Company, L.P., Deerfield International Master Fund, L.P., Deerfield Special Situations International Master Fund, L.P., Deerfield Private Design Fund III, L.P., 780 Third Avenue, 37th Floor, New York, NY 10017

Item 2(c).		Citizenship:

		Deerfield Mgmt, L.P., Deerfield Management Company, L.P., Deerfield Partners, L.P. and Deerfield Special Situations Fund, L.P., Deerfield Mgmt III, L.P., Deerfield Private Design Fund III, L.P. - Delaware limited partnerships; Deerfield International Master Fund, L.P. and Deerfield Special Situations International Master Fund, L.P., - British Virgin Islands limited partnerships; James E. Flynn – United States citizen

Item 2(d).		Title of Class of Securities:

		Common Stock

Item 2(e).		CUSIP Number:

		00771V108

Item 3.		If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a:

(a)	o	Broker or dealer registered under Section 15 of the Exchange Act.

(b)	o	Bank as defined in Section 3(a)(6) of the Exchange Act.

(c)	o	Insurance company as defined in Section 3(a)(19) of the Exchange Act.

(d)	o	Investment company registered under Section 8 of the Investment Company Act.

(e)

An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);


(f)	o	An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);

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(g)

A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G);


(h)		o	A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act;


(i)		o	A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act;


(j)		o	A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J);

(k)

Group, in accordance with Rule 13d-1(b)(1)(ii)(K).

If filing as a non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J), please specify the type of institution: _________________

Item 4.

Ownership.

Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

(a)			Amount beneficially owned**:

			Deerfield Mgmt, L.P. - 3,270,208 shares Deerfield Management Company, L.P. - 6,899,240 shares Deerfield Mgmt III, L.P. - 3,629,032 shares Deerfield Partners, L.P. - 1,212,778 shares Deerfield Special Situations Fund, L.P. - 301,825 shares Deerfield International Master Fund, L.P. - 1,506,304 shares Deerfield Special Situations International Master Fund, L.P. – 249,301 shares Deerfield Private Design Fund III, L.P. - 3,629,032 shares James E. Flynn – 6,899,240 shares

(b)			Percent of class**:

			Deerfield Mgmt, L.P. - 9.98% Deerfield Management Company, L.P. - 9.98% Deerfield Mgmt III, L.P. - 9.98% Deerfield Partners, L.P. - 4.96% Deerfield Special Situations Fund, L.P. – 1.25% Deerfield International Master Fund, L.P. – 6.14% Deerfield Special Situations International Master Fund, L.P. – 1.03% Deerfield Private Design Fund III, L.P. - 9.98% James E. Flynn – 9.98%

(c)	Number of shares as to which such person has**:

	(i)	Sole power to vote or to direct the vote:	All Reporting Persons - 0

	(ii)	Shared power to vote or to direct the vote:	Deerfield Mgmt, L.P. - 3,270,208 Deerfield Management Company, L.P. - 6,899,240 Deerfield Mgmt III, L.P. - 3,629,032 Deerfield Partners, L.P. - 1,212,778 Deerfield Special Situations Fund, L.P. - 301,825 Deerfield International Master Fund, L.P. - 1,506,304 Deerfield Special Situations International Master Fund, L.P. – 249,301 Deerfield Private Design Fund III, L.P. - 3,629,032 James E. Flynn – 6,899,240

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00771V108

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(iii)	Sole power to dispose or to direct the disposition of:	All Reporting Persons - 0

(ii)	Shared power to vote or to direct the vote:	Deerfield Mgmt, L.P. - 3,270,208 Deerfield Management Company, L.P. - 6,899,240 Deerfield Mgmt III, L.P. - 3,629,032 Deerfield Partners, L.P. - 1,212,778 Deerfield Special Situations Fund, L.P. - 301,825 Deerfield International Master Fund, L.P. - 1,506,304 Deerfield Special Situations International Master Fund, L.P. – 249,301 Deerfield Private Design Fund III, L.P. - 3,629,032 James E. Flynn – 6,899,240

**See footnotes on cover pages which are incorporated by reference herein.

Item 5.

Ownership of Five Percent or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities check the following o.

Item 6.

Ownership of More Than Five Percent on Behalf of Another Person.

If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than five percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.

N/A

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

If a parent holding company or Control person has filed this schedule, pursuant to Rule 13d-1(b)(1)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company or control person has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.

N/A

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00771V108

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Item 8.

Identification and Classification of Members of the Group.

If a group has filed this schedule pursuant to ss.240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to ss.240.13d-1(c) or ss.240.13d-1(d), attach an exhibit stating the identity of each member of the group.

See Exhibit B

Item 9.

Notice of Dissolution of Group.

Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual capacity. See Item 5.

N/A

Item 10.

Certifications.

"By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under §240.14a–11."

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SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

DEERFIELD MGMT, L.P.

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD MANAGEMENT COMPANY, L.P.

By: Flynn Management LLC, General Partner

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD MGMT III, L.P.

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD PARTNERS, L.P.

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

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD SPECIAL SITUATIONS FUND, L.P.

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

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD INTERNATIONAL MASTER FUND, L.P.

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

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD SPECIAL SITUATIONS INTERNATIONAL MASTER FUND, L.P.

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

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

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00771V108

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DEERFIELD PRIVATE DESIGN FUND III, L.P.

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

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

JAMES E. FLYNN

/s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

Date: February 17, 2015

Exhibit List

Exhibit A. Joint Filing Agreement.

Exhibit B. Item 8 Statement.

Exhibit C. Power of Attorney (1).

(1) Power of Attorney previously filed as Exhibit 24 to a Form 3 with regard to Avalanche Biotechnologies, Inc. filed with the Securities and Exchange Commission on July 30, 2014 by Deerfield Mgmt, L.P., Deerfield Mgmt III, L.P., Deerfield Special Situations Fund, L.P., Deerfield Special Situations International Master Fund, L.P., Deerfield Private Design Fund III, L.P. and James E. Flynn.

Exhibit A

Joint Filing Agreement

The undersigned agree that this Schedule 13G, and all amendments thereto, relating to the Common Stock of Aerie Pharmaceuticals, Inc. shall be filed on behalf of the undersigned.

DEERFIELD MGMT, L.P.

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD MANAGEMENT COMPANY, L.P.

By: Flynn Management LLC, General Partner

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD MGMT III, L.P.

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD PARTNERS, L.P.

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

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD SPECIAL SITUATIONS FUND, L.P.

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

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD INTERNATIONAL MASTER FUND, L.P.

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

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD SPECIAL SITUATIONS INTERNATIONAL MASTER FUND, L.P.

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

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

DEERFIELD PRIVATE DESIGN FUND III, L.P.

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

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

By: /s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

JAMES E. FLYNN

/s/ Jonathan Isler

Jonathan Isler, Attorney-In-Fact

Exhibit B

Due to the relationships between them, the reporting persons hereunder may be deemed to constitute a “group” with one another for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934.