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 * Choi Jung   2. Issuer Name and Ticker or Trading Symbol Global Blood Therapeutics, Inc. [GBT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) See Remarks (Last) (First) (Middle) C/O GLOBAL BLOOD THERAPEUTICS, INC., 171 OYSTER POINT BLVD, SUITE 300 3. Date of Earliest Transaction (Month/Day/Year) 02/14/2018 (Street) SOUTH SAN FRANCISCO, CA 94080 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ 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 02/14/2018   M   2,000 A (1) 143,169 (2) D   Common Stock 02/14/2018   F   692 (3) D $ 62.3 142,477 D   Common Stock               25,000 I By trust

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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

Restricted Stock Units

(1)

02/14/2018

M

2,000

(4)

(4)

Common Stock

2,000

$ 0

7,000

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Choi Jung C/O GLOBAL BLOOD THERAPEUTICS, INC. 171 OYSTER POINT BLVD, SUITE 300 SOUTH SAN FRANCISCO, CA 94080			See Remarks

Signatures

Lesley Ann Calhoun, as Attorney-in-Fact		02/16/2018
**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)	Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Issuer's Common Stock.
(2)	Includes 676 shares acquired under the Issuer's Employee Stock Purchase Plan ("ESPP") on July 31, 2017 and 435 shares acquired under the ESPP on January 31, 2018, each in a transaction exempt under Rule 16b-3.
(3)	Represents number of shares of Issuer's Common Stock withheld to satisfy the Reporting Person's tax obligations in connection with the vesting of 2,000 shares of Common Stock underlying the Reporting Person's RSUs.
(4)	On August 11, 2017, the Reporting Person was granted 15,000 RSUs, which vest in installments upon the achievement of specified market capitalization milestones of the Issuer on or before December 31, 2019, so long as the Reporting Person continues as an employee or other service provider of the Issuer through each vesting milestone. On February 14, 2018, one of the performance milestones was achieved, resulting in the vesting of 2,000 shares of Common Stock underlying the RSU grant. The RSUs are subject to accelerated vesting upon termination without cause or resignation for good reason after a change of control of the Issuer.
Remarks: Chief Business and Strategy Officer

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