Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Flynn James E
2. Date of Event Requiring Statement (Month/Day/Year)
08/02/2017
3. Issuer Name and Ticker or Trading Symbol
PROTEON THERAPEUTICS INC [PRTO]
(Last)
(First)
(Middle)
780 THIRD AVENUE, 37TH FLOOR, 
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
*Director by Deputization
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

NEW YORK, NY 10017
6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 877,799
I
Through Deerfield Private Design Fund III, L.P. (1) (2) (3)
Common Stock 149,676
I
Through Deerfield Special Situations Fund, L.P. (1) (2) (3)
Common Stock 110,557
I
Through Deerfield International Master Fund, L.P. (1) (2) (3)
Common Stock 86,867
I
Through Deerfield Partners, L.P. (1) (2) (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Series A Convertible Preferred Stock   (4)   (4) Common Stock 16,082,018 $ (4) I Through Deerfield Private Design Fund IV, L.P. (1) (2) (3)

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Flynn James E
780 THIRD AVENUE, 37TH FLOOR
NEW YORK, NY 10017
  X     *Director by Deputization
Deerfield Private Design Fund III, L.P.
780 THIRD AVENUE, 37TH FLOOR
NEW YORK, NY 10017
  X     *Director by Deputization
Deerfield Special Situations Fund, L.P.
780 3RD AVENUE
37TH FLOOR
NEW YORK, NY 10017
  X     *Director by Deputization
Deerfield International Master Fund, L.P.
780 THIRD AVENUE, 37TH FLOOR
NEW YORK, NY 10017
  X     *Director by Deputization
DEERFIELD PARTNERS, L.P.
780 THIRD AVENUE
37TH FLOOR
NEW YORK, NY 10017
  X     *Director by Deputization
Deerfield Private Design Fund IV, L.P.
780 THIRD AVENUE 37TH FLOOR
NEW YORK, NY 10017
  X     *Director by Deputization
Deerfield Mgmt L.P.
780 THIRD AVENUE
37TH FLOOR
NEW YORK, NY 10017
  X     *Director by Deputization
Deerfield Mgmt III, L.P.
780 THIRD AVENUE, 37TH FLOOR
NEW YORK, NY 10017
  X     *Director by Deputization
Deerfield Mgmt IV, L.P.
780 THIRD AVENUE, 37TH FLOOR
NEW YORK, NY 10017
  X     *Director by Deputization
DEERFIELD MANAGEMENT CO
780 THIRD AVENUE, 37TH FLOOR
NEW YORK, NY 10017
  X     *Director by Deputization

Signatures

/s/ Jonathan Isler, Attorney-in-Fact 08/04/2017
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) This Form 3 is being filed by the undersigned as well as the entities listed on the Joint Filer Information Statement attached as an exhibit hereto (the "Reporting Persons"). Deerfield Mgmt III, L.P. is the general partner of Deerfield Private Design Fund III, L.P. ("Fund III"). Deerfield Mgmt, L.P. is the general partner of each of Deerfield Special Situations Fund, L.P. ("DSS Fund"), Deerfield International Master Fund, L.P. ("Master Fund") and Deerfield Partners, L.P. ("Deerfield Partners").
(2) Deerfield Mgmt IV, L.P. is the general partner of Deerfield Private Design Fund IV, L.P. ("Deerfield Private Design Fund IV" and collectively with Fund III, DSS Fund, Master Fund and Deerfield Partners, the "Funds"). Deerfield Management Company, L.P. is the investment manager of each of the Funds. James E. Flynn is the sole member of the general partner of each of Deerfield Mgmt III, L.P., Deerfield Mgmt, L.P., Deerfield Management Company, L.P. ("Deerfield Management") and Deerfield Mgmt IV, L.P. In accordance with Instruction 5(b)(iv) to Form 3, the entire amount of the Issuer's securities held by the Funds is reported herein.
(3) For purposes of Section 16 of the Securities Exchange Act of 1934, as amended, each Reporting Person disclaims beneficial ownership of any such securities, except to the extent of his/its indirect pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or otherwise.
(4) Each share of Series A Convertible Preferred Stock, par value $0.001 per share (the "Preferred Stock"), of the Issuer is convertible, at any time at the option of the holder of such share of Preferred Stock, into approximately 1,005 shares of the Issuer's Common Stock, par value $0.001 per share, at a conversion price of $0.9949 per share, subject to adjustment for any stock splits, stock dividends and similar events in accordance with the Certificate of Designation of Preferences, Rights and Limitations of Series A Convertible Preferred Stock of the Issuer, dated August 1, 2017.
 
Remarks:
Jonathan Leff, a partner in Deerfield Management Company, serves as a director of the Issuer.

Please see Joint Filer Information Statement attached as Exhibit 99 hereto.

Exhibit List
Exhibit 24 - Power of Attorney
Exhibit 99 - Joint Filer Information Statement

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