FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN 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 * SRB Associates IX L.P.   2. Issuer Name and Ticker or Trading Symbol ALDER BIOPHARMACEUTICALS INC [ALDR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 13355 NOEL ROAD, SUITE 1350 3. Date of Earliest Transaction (Month/Day/Year) 05/19/2015 (Street) DALLAS, TX 75240 4. If Amendment, Date Original Filed(Month/Day/Year) 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 Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/19/2015   S   1,136,100 (1) D $ 37.0213 (2) 4,048,874 I See Footnote (3)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
SRB Associates IX L.P. 13355 NOEL ROAD SUITE 1350 DALLAS, TX 75240		X
Sevin Rosen Fund IX L.P. 13455 NOEL ROAD, SUITE 1670 DALLAS, TX 75240		X
Sevin Rosen IX Affiliates Fund L.P. 13455 NOEL ROAD, SUITE 1670 DALLAS, TX 75240		X

Signatures

John V. Jaggers, Attorney-In-Fact For SRB Associates IX L.P.		05/20/2015
**Signature of Reporting Person		Date
John V. Jaggers, Attorney-In-Fact For Sevin Rosen Fund IX L.P.		05/20/2015
**Signature of Reporting Person		Date
John V. Jaggers, Attorney-In-Fact For Sevin Rosen IX Affiliates Fund L.P.		05/20/2015
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(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)	Represents 1,136,100 Common Shares sold directly by Sevin Rosen Fund IX L.P. pursuant to Rule 144 under the Securities Act of 1933, as amended.
(2)	The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $37.00 to $39.80, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.
(3)	Total Common Shares of 4,048,874 represents 3,947,770 shares owned directly by Sevin Rosen Fund IX L.P. ("SRFIX") and 101,104 shares owned directly by Sevin Rosen IX Affiliates Fund L.P. ("SRIX AFF"). SRB Associates IX L.P. ("SRBAIX") is the general partner of SRFIX and SRIX AFF, and in that capacity has shared voting and dispositive power over such shares. SRBAIX disclaims beneficial ownership of such shares except to the extent of its pecuniary interest.

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